/* ==========================================================================
   scene 官网样式表  ·  assets/css/style.css
   设计 Token 来源于 logo.png 像素取色：
     主色 #528EF1 / 深主色 #437BDA / 辅助绿 #32DD82 / 点缀金 #FFCB4B
   Token 定义见 assets/tokens.json
   全部本地样式，无任何外部 CDN 依赖，可完全离线运行。
   ========================================================================== */

/* ---------- 1. Token ---------- */
:root {
  /* 品牌色：取自 logo 蓝色底 */
  --brand-50: #eef4ff;
  --brand-100: #dce8ff;
  --brand-200: #bcd3fb;
  --brand-300: #93b7f7;
  --brand-400: #6f9df4;
  --brand-500: #528ef1;
  --brand-600: #437bda;
  --brand-700: #2f5fb8;
  --brand-800: #1e4189;
  --brand-900: #142c5e;
  --brand-950: #0b1b3d;

  /* 辅助色：取自 logo 安卓机器人绿 */
  --accent-50: #e8fcf1;
  --accent-100: #c9f7de;
  --accent-300: #6fe7a9;
  --accent-500: #32dd82;
  --accent-600: #1bbf6a;

  /* 点缀色：取自 logo 齿轮金 */
  --gold-100: #fff6df;
  --gold-300: #ffe08a;
  --gold-400: #ffcb4b;
  --gold-500: #f0ae1c;

  /* 文字 */
  --ink-900: #0d1526;
  --ink-800: #182238;
  --ink-700: #2c3a55;
  --ink-600: #455571;
  --ink-500: #64738d;
  --ink-400: #8a97ae;
  --ink-300: #b3bdce;

  /* 面 */
  --surface-page: #f5f8fd;
  --surface-card: #ffffff;
  --surface-soft: #edf2fb;
  --line: #e1e8f4;
  --line-strong: #cfd9ec;

  /* 字体 */
  --font-sans: "Inter", "Outfit", -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 圆角 */
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-2xl: 36px;
  --r-pill: 999px;

  /* 阴影 */
  --sh-xs: 0 1px 2px rgba(13, 21, 38, 0.06);
  --sh-sm: 0 2px 8px rgba(13, 21, 38, 0.06);
  --sh-md: 0 10px 30px -12px rgba(30, 65, 137, 0.18);
  --sh-lg: 0 24px 60px -24px rgba(30, 65, 137, 0.28);
  --sh-glow: 0 18px 44px -16px rgba(82, 142, 241, 0.55);

  /* 玻璃拟态 */
  --glass-light: rgba(255, 255, 255, 0.78);
  --glass-dark: rgba(255, 255, 255, 0.08);
  --blur: saturate(170%) blur(18px);

  /* 版心 */
  --wrap: 1200px;
  --gutter: clamp(18px, 4vw, 40px);
  --header-h: 68px;

  /* 缓动 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 2. Reset & 基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  color: var(--ink-900);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
}

p { margin: 0 0 1em; }

a { color: var(--brand-700); text-decoration: none; }
a:hover { color: var(--brand-600); }

img, svg { max-width: 100%; }
img { height: auto; display: block; }

ul, ol { margin: 0 0 1em; padding-left: 1.3em; }
li { margin-bottom: 0.45em; }

strong { color: var(--ink-800); font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--brand-400);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection { background: var(--brand-200); color: var(--brand-900); }

/* 跳转到主内容（无障碍 + 语义） */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 12px 20px;
  background: var(--brand-700);
  color: #fff;
  border-radius: 0 0 var(--r-md) 0;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---------- 3. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding: clamp(64px, 9vw, 112px) 0; position: relative; }
.section--tight { padding: clamp(48px, 6vw, 76px) 0; }
.section--soft { background: linear-gradient(180deg, #ffffff 0%, var(--surface-page) 100%); }
.section--ink {
  background: linear-gradient(155deg, var(--brand-950) 0%, var(--brand-900) 46%, var(--brand-700) 100%);
  color: rgba(255, 255, 255, 0.82);
}
.section--ink h2, .section--ink h3 { color: #fff; }

/* 章节标题：编号 + 标题 + 说明 的非常规排布 */
.sec-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 18px;
  align-items: start;
  margin-bottom: clamp(32px, 5vw, 56px);
  max-width: 800px;
}
.sec-head--plain { grid-template-columns: minmax(0, 1fr); max-width: 780px; }
/* 章节编号：做成小方章，和工具卡里的图标底座同一套语言 */
.sec-head__num {
  grid-row: 1 / span 2;
  align-self: start;
  justify-self: start;
  margin-top: 5px;
  display: grid;
  place-items: center;
  width: auto;
  min-width: 36px;
  height: 36px;
  padding: 0 9px;
  border-radius: 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0;
  color: var(--brand-600);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  box-shadow: 0 1px 2px rgba(30, 65, 137, 0.06);
}
.sec-head__title {
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  margin-bottom: 0.35em;
}
.sec-head__title em {
  font-style: normal;
  color: var(--brand-600);
}
.sec-head__desc {
  color: var(--ink-500);
  font-size: 1rem;
  margin: 0;
}
.section--ink .sec-head__desc { color: rgba(255, 255, 255, 0.68); }
.section--ink .sec-head__num {
  color: var(--accent-500);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: none;
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 26px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 0.97rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  text-align: center;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease),
    background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
  will-change: transform;
}
.btn svg { flex: 0 0 auto; }

.btn--primary {
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-700) 100%);
  color: #fff;
  box-shadow: var(--sh-glow);
}
.btn--primary:hover {
  color: #fff;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 24px 54px -16px rgba(82, 142, 241, 0.72);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.26);
  color: #fff;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.btn--ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
  transform: translateY(-2px);
}

.btn--line {
  background: #fff;
  border-color: var(--line-strong);
  color: var(--ink-800);
  box-shadow: var(--sh-xs);
}
.btn--line:hover {
  color: var(--brand-700);
  border-color: var(--brand-300);
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}

.btn--accent {
  background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-600) 100%);
  color: #06301a;
  box-shadow: 0 18px 40px -18px rgba(50, 221, 130, 0.7);
}
.btn--accent:hover { color: #06301a; transform: translateY(-2px) scale(1.02); }

.btn--lg { padding: 17px 34px; font-size: 1.05rem; border-radius: var(--r-lg); }
.btn--sm { padding: 10px 18px; font-size: 0.88rem; border-radius: var(--r-sm); }

/* ---------- 5. 顶栏（与正文同一套圆角/阴影/配色语言） ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background-color 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease), backdrop-filter 0.35s var(--ease);
  border-bottom: 1px solid transparent;
  background: transparent;
}
.site-header__inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 18px;
}

/* 品牌：logo 缩略图 + 站名 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: #fff;
  transition: color 0.35s var(--ease);
}
.brand:hover { color: #fff; }
.brand__logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  object-fit: cover;
  box-shadow: 0 6px 18px -6px rgba(11, 27, 61, 0.55);
  background: #fff;
  transition: transform 0.4s var(--ease-out);
}
.brand picture,
.phone__appbar picture { display: inline-flex; line-height: 0; }
.brand:hover .brand__logo { transform: rotate(-6deg) scale(1.06); }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name {
  font-size: 1.14rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.brand__tag {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.66;
}

.nav { margin-left: auto; }
.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__list li { margin: 0; }
.nav__link {
  display: block;
  padding: 9px 15px;
  border-radius: var(--r-pill);
  font-size: 0.93rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.nav__link:hover,
.nav__link[aria-current="page"] {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
}

.header__cta { margin-left: 10px; }
/* 桌面端只保留顶栏右侧的下载按钮，抽屉式按钮仅在移动端出现 */
.nav__cta-item { display: none; }

/* 顶栏滚动态 / 浅色页面态：与正文卡片完全一致的玻璃语言 */
.site-header.is-solid {
  background: var(--glass-light);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 34px -22px rgba(30, 65, 137, 0.35);
}
.site-header.is-solid .brand { color: var(--ink-900); }
.site-header.is-solid .brand:hover { color: var(--brand-700); }
.site-header.is-solid .nav__link { color: var(--ink-600); }
.site-header.is-solid .nav__link:hover,
.site-header.is-solid .nav__link[aria-current="page"] {
  color: var(--brand-700);
  background: var(--brand-50);
}
.site-header.is-solid .btn--ghost {
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-700) 100%);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 12px 30px -14px rgba(82, 142, 241, 0.75);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  border: 1px solid rgba(255, 255, 255, 0.26);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.site-header.is-solid .nav-toggle {
  border-color: var(--line-strong);
  background: #fff;
  color: var(--ink-800);
}
.nav-toggle__bars { display: block; position: relative; width: 17px; height: 2px; background: currentColor; border-radius: 2px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 17px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(48px, 8vw, 88px)) 0 clamp(120px, 14vw, 180px);
  background: linear-gradient(158deg, #0a1834 0%, var(--brand-900) 42%, var(--brand-700) 100%);
  color: rgba(255, 255, 255, 0.8);
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 62px 62px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 120px;
  background: linear-gradient(180deg, transparent, rgba(245, 248, 253, 0.16));
  z-index: -1;
}
.hero__glow {
  position: absolute;
  inset: 0;
  z-index: -3;
  pointer-events: none;
}
.hero__glow i {
  position: absolute;
  display: block;
  border-radius: 50%;
  filter: blur(90px);
}
.hero__glow i:nth-child(1) {
  width: 520px; height: 520px; top: -180px; left: -80px;
  background: rgba(82, 142, 241, 0.55);
}
.hero__glow i:nth-child(2) {
  width: 420px; height: 420px; bottom: -160px; right: -60px;
  background: rgba(50, 221, 130, 0.3);
}
.hero__glow i:nth-child(3) {
  width: 300px; height: 300px; top: 30%; right: 24%;
  background: rgba(255, 203, 75, 0.16);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

/* 品牌胶囊 */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 15px 7px 9px;
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  font-size: 0.83rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
}
.pill__dot {
  width: 22px; height: 22px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--accent-500);
  color: #06301a;
  font-size: 0.6rem;
}
.pill--light {
  background: #fff;
  border-color: var(--line);
  color: var(--ink-600);
  box-shadow: var(--sh-xs);
}

.hero__title {
  margin: 22px 0 20px;
  color: #fff;
  font-size: clamp(2.15rem, 5.4vw, 3.9rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.035em;
}
.hero__title .hero__brand {
  display: block;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  background: linear-gradient(100deg, #ffffff 12%, var(--brand-300) 46%, var(--accent-500) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.hero__title .hero__kw { display: block; }
.hero__sub {
  max-width: 32em;
  margin: 0 0 26px;
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  font-weight: 500;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.74);
}
.hero__sub strong { color: #fff; font-weight: 700; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 22px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  padding: 0;
  margin: 0 0 4px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.66);
}
.hero__meta li { display: flex; align-items: center; gap: 7px; margin: 0; }
.hero__meta svg { color: var(--accent-500); }

/* 右侧：手机模型（纯 CSS + SVG，无外部图片） */
.hero__visual { position: relative; display: flex; justify-content: center; }
.phone {
  position: relative;
  width: min(300px, 74vw);
  aspect-ratio: 9 / 18.6;
  border-radius: 40px;
  padding: 12px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0.06));
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: 0 50px 90px -40px rgba(3, 10, 26, 0.85),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  animation: float 7s var(--ease) infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50% { transform: translateY(-14px) rotate(0.6deg); }
}
.phone__screen {
  height: 100%;
  border-radius: 30px;
  background: linear-gradient(180deg, #f7fafe 0%, #eaf1fc 100%);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 16px 14px;
  gap: 10px;
}
.phone__notch {
  position: absolute;
  top: 20px; left: 50%;
  transform: translateX(-50%);
  width: 74px; height: 6px;
  border-radius: 999px;
  background: rgba(11, 27, 61, 0.32);
}
.phone__appbar {
  display: flex; align-items: center; gap: 8px;
  padding: 16px 0 6px;
}
.phone__appbar img { width: 26px; height: 26px; border-radius: 8px; }
.phone__appbar b { font-size: 0.82rem; color: var(--ink-800); }
.phone__appbar span {
  margin-left: auto; font-size: 0.62rem; font-weight: 700;
  color: var(--brand-700); background: var(--brand-50);
  padding: 3px 8px; border-radius: 999px;
}
.phone__tiles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.phone__tile {
  aspect-ratio: 1;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 3px 10px -4px rgba(30, 65, 137, 0.22);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  font-size: 0.55rem;
  font-weight: 600;
  color: var(--ink-500);
}
.phone__tile i {
  width: 22px; height: 22px;
  display: block;
  border-radius: 7px;
}
.phone__bar {
  margin-top: auto;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  box-shadow: 0 12px 26px -14px rgba(82, 142, 241, 0.9);
}
/* 手机屏里这条是真链接（不是装饰按钮）。
   注意 a:hover 的权重 (0,1,1) 高于 .phone__bar (0,1,0)，
   不显式写 a.phone__bar 的话，悬停时文字会被染成 brand-600，糊在蓝色底上看不见。 */
a.phone__bar {
  color: #fff;
  transition: translate 0.24s var(--ease), box-shadow 0.24s var(--ease), filter 0.24s var(--ease);
}
a.phone__bar:hover {
  color: #fff;
  translate: 0 -2px;
  filter: brightness(1.07);
  box-shadow: 0 18px 34px -14px rgba(82, 142, 241, 0.95);
}
a.phone__bar:active { translate: 0 1px; }
/* 标签 + 它的内容算一块，屏幕铺开留白时不会被拆散 */
.phone__blk { display: flex; flex-direction: column; }
.phone__label {
  margin-top: 4px;
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-400);
}
.phone__stat { margin-top: 5px; }
.phone__stat-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--ink-500);
  margin-bottom: 5px;
}
.phone__stat-top b { color: var(--ink-800); font-family: var(--font-mono); font-size: 0.58rem; }
.phone__stat-bar {
  height: 7px;
  border-radius: 999px;
  background: rgba(11, 27, 61, 0.08);
  overflow: hidden;
}
.phone__stat-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand-400), var(--brand-600));
}
.phone__stat-bar i.is-green { background: linear-gradient(90deg, var(--accent-300), var(--accent-600)); }
.phone__list { display: grid; gap: 6px; margin-top: 6px; }
.phone__list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border-radius: 11px;
  padding: 8px 10px;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--ink-600);
  box-shadow: 0 3px 10px -5px rgba(30, 65, 137, 0.3);
}
.phone__list-item i {
  width: 18px; height: 18px;
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  flex: 0 0 auto;
}
.phone__list-item b {
  margin-left: auto;
  font-size: 0.55rem;
  font-weight: 700;
  color: var(--ink-400);
}
/* 屏幕最后的更新说明：把机身中下段填起来，别让底部只剩空白 */
.phone__note {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed rgba(11, 27, 61, 0.16);
  background: rgba(255, 255, 255, 0.66);
}
.phone__note b {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  color: var(--ink-700);
}
.phone__note span {
  font-size: 0.56rem;
  line-height: 1.55;
  color: var(--ink-400);
}

/* 悬浮信息卡 */
.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 15px;
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: 0 22px 44px -20px rgba(3, 10, 26, 0.6);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--ink-800);
  white-space: nowrap;
}
.float-card i {
  width: 30px; height: 30px;
  border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  flex: 0 0 auto;
}
.float-card small { display: block; font-size: 0.66rem; font-weight: 600; color: var(--ink-400); }
.float-card--a { top: 12%; left: -6%; animation: float 6s var(--ease) infinite 0.4s; }
.float-card--b { bottom: 16%; right: -4%; animation: float 6.6s var(--ease) infinite 1.1s; }

/* Hero 右侧竖排章节索引（桌面端）
   注意：全局 a{color:--brand-700} 会盖掉 li 的颜色，链接必须显式继承，
   否则深蓝字压在深蓝底上直接看不见。 */
.hero__rail {
  position: absolute;
  right: calc(-1 * clamp(8px, 3vw, 46px));
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 15px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.73rem;
  letter-spacing: 0.01em;
  color: var(--accent-500);
}
.hero__rail li { display: flex; align-items: center; gap: 9px; margin: 0; }
.hero__rail a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 600;
  text-shadow: 0 1px 3px rgba(3, 14, 38, 0.5);
  transition: color 0.28s var(--ease);
}
.hero__rail a b {
  font-family: var(--font-mono);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.52);
  transition: color 0.28s var(--ease);
}
.hero__rail a:hover,
.hero__rail li.is-on a { color: #fff; }
.hero__rail a:hover b,
.hero__rail li.is-on a b { color: var(--accent-500); }
.hero__rail li::after {
  content: "";
  width: 13px; height: 1.5px;
  border-radius: 1.5px;
  background: rgba(255, 255, 255, 0.42);
  transition: width 0.3s var(--ease), background-color 0.3s var(--ease);
}
.hero__rail li.is-on::after { width: 26px; background: currentColor; }

/* ---------- 7. 数据条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--r-xl);
  overflow: hidden;
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
}
.stats__item {
  background: rgba(255, 255, 255, 0.05);
  padding: clamp(20px, 3vw, 32px) clamp(16px, 2.4vw, 26px);
  transition: background-color 0.35s var(--ease);
}
.stats__item:hover { background: rgba(255, 255, 255, 0.12); }
.stats__num {
  display: block;
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1.1;
}
.stats__num em {
  font-style: normal;
  font-size: 0.5em;
  font-weight: 700;
  color: var(--accent-500);
  margin-left: 3px;
}
.stats__label { font-size: 0.83rem; color: rgba(255, 255, 255, 0.62); }

/* ---------- 8. 关于 scene：叙述 + 做与不做 ---------- */
/* 一整块面板，左叙述右承诺，去掉半悬浮的文字墙与两张不成对的卡片 */
.about-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-sm);
  overflow: hidden;
}
.about-story {
  display: flex;
  flex-direction: column;
  padding: clamp(26px, 3.2vw, 44px);
  background:
    radial-gradient(130% 96% at 0% 0%, rgba(82, 142, 241, 0.11), transparent 60%),
    linear-gradient(180deg, #fbfcff 0%, #f5f9ff 100%);
  border-right: 1px solid var(--line);
}
.about-story__k {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--brand-600);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--brand-100);
  border-radius: var(--r-pill);
  padding: 5px 13px 5px 10px;
  margin-bottom: 20px;
}
.about-story__q {
  margin: 0 0 22px;
  padding-left: 15px;
  border-left: 3px solid var(--brand-400);
  font-size: clamp(1.08rem, 1.5vw, 1.26rem);
  font-weight: 800;
  line-height: 1.6;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}
.about-story p:not(.about-story__q):not(.about-story__cta) {
  margin: 0 0 13px;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--ink-600);
}
.about-story p:not(.about-story__q):not(.about-story__cta):last-of-type { margin-bottom: 0; }
.about-story p strong { color: var(--ink-900); font-weight: 700; }
/* 按钮钉在面板底部，用一条虚线把它和正文分开，右下不留下空档 */
.about-story__cta {
  align-self: stretch;
  margin: auto 0 0;
  padding-top: clamp(22px, 2.4vw, 30px);
  border-top: 1px dashed var(--line-strong);
}

/* 右侧承诺清单：两块等高的清单，靠标题底座的配色区分 */
.about-pledge {
  display: grid;
  grid-template-rows: 1fr 1fr;
  padding: clamp(26px, 3.2vw, 44px);
}
.pd { display: flex; flex-direction: column; min-height: 0; }
.pd + .pd {
  margin-top: clamp(18px, 2.2vw, 28px);
  padding-top: clamp(18px, 2.2vw, 28px);
  border-top: 1px dashed var(--line-strong);
}
.pd__hd {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 4px;
}
.pd__hd i {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: var(--surface-soft);
  color: var(--ink-500);
}
.pd--yes .pd__hd i { background: var(--accent-50); color: var(--accent-600); }
.pd__hd b { font-size: 1rem; font-weight: 800; color: var(--ink-900); }
.pd__hd em {
  margin-left: auto;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
  color: var(--ink-400);
}
.pd ul { list-style: none; margin: 0; padding: 0; }
.pd li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 0;
  padding: 9px 0;
  font-size: 0.91rem;
  line-height: 1.68;
  color: var(--ink-500);
}
.pd li + li { border-top: 1px solid var(--line); }
.pd li svg { flex: 0 0 auto; margin-top: 3px; }
.pd--yes li svg { color: var(--accent-600); }
.pd--no li svg { color: var(--ink-400); }
.pd li b { color: var(--ink-800); font-weight: 700; }

/* ---------- 9. 版本列表 ---------- */
.ver-list { display: grid; gap: 14px; }
.ver {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  gap: 20px;
  align-items: start;
  padding: 22px 24px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out), border-color 0.35s var(--ease);
}
.ver:hover { transform: translateY(-4px); border-color: var(--brand-200); box-shadow: var(--sh-md); }
.ver__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink-900);
}
.ver__tag i {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent-500);
  box-shadow: 0 0 0 4px rgba(50, 221, 130, 0.18);
}
.ver__date { display: block; font-size: 0.78rem; color: var(--ink-400); font-weight: 500; margin-top: 4px; font-family: var(--font-mono); }
.ver__body h3 { font-size: 0.98rem; margin-bottom: 0.4em; }
.ver__body ul { margin: 0; padding-left: 1.1em; }
.ver__body li { font-size: 0.88rem; color: var(--ink-500); }
.ver__badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 5px 11px;
  border-radius: var(--r-pill);
  background: var(--brand-50);
  color: var(--brand-700);
  white-space: nowrap;
}
.ver__badge--new { background: var(--accent-50); color: #128f4f; }
/* 每条版本记录右侧：状态徽标 + 下载按钮 */
.ver__side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 11px;
}
.ver__dl { white-space: nowrap; }

/* ---------- 10. FAQ ---------- */
.faq { display: grid; gap: 12px; max-width: 900px; }
.faq details {
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.faq details[open] { border-color: var(--brand-200); box-shadow: var(--sh-md); }
.faq summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 19px 22px;
  cursor: pointer;
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink-900);
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  flex: 0 0 auto;
  margin-left: auto;
  width: 11px; height: 11px;
  border-right: 2px solid var(--brand-500);
  border-bottom: 2px solid var(--brand-500);
  transform: rotate(45deg) translateY(-3px);
  transition: transform 0.3s var(--ease);
}
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-3px); }
.faq summary svg { color: var(--brand-500); flex: 0 0 auto; }
.faq__body { padding: 0 22px 20px; }
.faq__body p { font-size: 0.92rem; color: var(--ink-500); margin: 0 0 0.8em; }
.faq__body p:last-child { margin-bottom: 0; }

/* ---------- 11. 用户评价 ---------- */
/* 左边一块跟着滚动的评分总览，右边是多栏流式评价墙。
   和站内其它的等分网格、横向轨道、手风琴都不一样，不重复之前的骨架。 */
.rv {
  display: grid;
  grid-template-columns: minmax(0, 322px) minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 30px);
  align-items: start;
}

/* 左：评分总览，往下滚的时候停住 */
.rv-sum {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  padding: clamp(22px, 2.6vw, 30px);
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-md);
}
.rv-sum__score { display: flex; align-items: flex-end; gap: 9px; }
.rv-sum__score b {
  font-size: clamp(2.7rem, 5.2vw, 3.5rem);
  font-weight: 900;
  line-height: 0.86;
  letter-spacing: -0.05em;
  background: linear-gradient(132deg, var(--brand-700), var(--brand-500) 52%, var(--accent-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.rv-sum__score span { font-size: 0.82rem; font-weight: 700; color: var(--ink-400); padding-bottom: 6px; }
.rv-sum__stars { display: block; margin: 13px 0 8px; }
.rv-sum__count { margin: 0; font-size: 0.86rem; color: var(--ink-500); }
.rv-sum__count b { color: var(--ink-900); font-weight: 800; }

/* 评分分布 */
.rv-bars {
  list-style: none;
  display: grid;
  gap: 8px;
  margin: 20px 0 0;
  padding: 17px 0 0;
  border-top: 1px dashed var(--line-strong);
}
.rv-bars li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 32px;
  align-items: center;
  gap: 9px;
  font-size: 0.77rem;
  color: var(--ink-500);
}
.rv-bars i {
  display: block;
  height: 6px;
  border-radius: var(--r-pill);
  background: var(--surface-soft);
  overflow: hidden;
}
.rv-bars i span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--brand-500), var(--brand-300));
}
.rv-bars em {
  font-style: normal;
  text-align: right;
  color: var(--ink-400);
  font-variant-numeric: tabular-nums;
}

/* 大家常提的几点（同时也是长尾词） */
.rv-keys {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed var(--line-strong);
}
.rv-keys li {
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--brand-700);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  border-radius: var(--r-pill);
  padding: 5px 11px;
}
.rv-sum__note {
  margin: 18px 0 0;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--ink-400);
}

/* 右：评价墙，双栏流式，卡片高度不齐更自然 */
.rv-list { columns: 2; column-gap: clamp(14px, 1.7vw, 20px); }
.rv-card {
  break-inside: avoid;
  -webkit-column-break-inside: avoid;
  padding: 22px;
  margin: 0 0 clamp(14px, 1.7vw, 20px);
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-xs);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out), border-color 0.3s var(--ease);
}
.rv-card:hover { transform: translateY(-4px); box-shadow: var(--sh-md); border-color: var(--brand-200); }
.rv-card--top { border-color: var(--brand-200); box-shadow: var(--sh-md); }
.rv-card__top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 13px;
  padding: 4px 10px 4px 8px;
  font-size: 0.71rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--brand-600);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  border-radius: var(--r-pill);
}
.rv-card__top svg { flex: 0 0 auto; }
.rv-card__hd {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 3px 10px;
  margin-bottom: 12px;
}
.rv-card__ava {
  grid-row: 1 / span 2;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 13px;
  font-size: 0.98rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
  box-shadow: 0 8px 18px -10px rgba(82, 142, 241, 0.9);
}
.rv-card:nth-child(3n + 2) .rv-card__ava { background: linear-gradient(135deg, var(--brand-600), var(--brand-900)); }
.rv-card:nth-child(3n + 3) .rv-card__ava { background: linear-gradient(135deg, var(--accent-600), var(--brand-600)); }
.rv-card__hd b { font-size: 0.95rem; font-weight: 800; color: var(--ink-900); }
.rv-card__hd small { font-size: 0.74rem; color: var(--ink-400); }
.rv-card p { margin: 0; font-size: 0.91rem; line-height: 1.88; color: var(--ink-600); }
.rv-card p strong { color: var(--ink-900); font-weight: 700; }
.rv-card__ft { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 14px; }
.rv-card__tag {
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--ink-500);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  padding: 4px 10px;
}

/* 星级：底下铺一层灰的，上面盖一层金色按比例裁开，4.8 这种小数也能显示 */
.stars { position: relative; display: inline-flex; align-items: center; gap: 2px; line-height: 0; }
.stars svg { display: block; }
.stars__row { display: inline-flex; gap: 2px; color: var(--ink-300); }
.stars__row--on {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: var(--fill, 100%);
  overflow: hidden;
  color: var(--gold-400);
}
.stars--sm { gap: 1px; }
.stars--sm .stars__row { gap: 1px; }

/* ---------- 12. 下载转化 ---------- */
.dl-panel {
  position: relative;
  border-radius: var(--r-2xl);
  overflow: hidden;
  padding: clamp(32px, 5vw, 58px);
  background: linear-gradient(150deg, var(--brand-950) 0%, var(--brand-800) 48%, var(--brand-600) 100%);
  color: rgba(255, 255, 255, 0.82);
  box-shadow: var(--sh-lg);
}
.dl-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: radial-gradient(80% 70% at 78% 22%, #000, transparent 72%);
  -webkit-mask-image: radial-gradient(80% 70% at 78% 22%, #000, transparent 72%);
  pointer-events: none;
}
.dl-panel__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(28px, 4vw, 54px);
  align-items: center;
}
.dl-panel h2 { color: #fff; font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
.dl-panel p { color: rgba(255, 255, 255, 0.74); }
.dl-note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.62);
  margin-top: 16px;
}
.dl-note svg { flex: 0 0 auto; margin-top: 4px; color: var(--gold-400); }
.dl-spec {
  display: grid;
  gap: 1px;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--r-xl);
  overflow: hidden;
}
.dl-spec div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  background: rgba(10, 24, 52, 0.34);
  font-size: 0.86rem;
}
.dl-spec dt { color: rgba(255, 255, 255, 0.6); margin: 0; }
.dl-spec dd { margin: 0; color: #fff; font-weight: 700; font-family: var(--font-mono); font-size: 0.82rem; }

/* ---------- 13. 页脚 ---------- */
.site-footer {
  background: linear-gradient(180deg, #0d1930 0%, #0a1428 100%);
  color: rgba(255, 255, 255, 0.62);
  padding: clamp(48px, 6vw, 72px) 0 0;
  font-size: 0.9rem;
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
  gap: clamp(26px, 4vw, 54px);
  padding-bottom: 40px;
}
.footer__brand .brand { color: #fff; margin-bottom: 16px; }
.footer__brand p { font-size: 0.9rem; color: rgba(255, 255, 255, 0.58); max-width: 34em; }
.footer__col h2,
.footer__col h3 {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.44);
  margin-bottom: 16px;
}
.footer__col ul { list-style: none; padding: 0; margin: 0; }
.footer__col li { margin-bottom: 10px; }
.footer__col a { color: rgba(255, 255, 255, 0.74); font-size: 0.9rem; transition: color 0.25s var(--ease); }
.footer__col a:hover { color: var(--brand-300); }

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 22px 0 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  align-items: center;
  justify-content: space-between;
  font-size: 0.83rem;
  color: rgba(255, 255, 255, 0.5);
}
.footer__legal { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
.footer__legal a { color: rgba(255, 255, 255, 0.68); }
.footer__legal a:hover { color: var(--brand-300); }
.footer__icp { display: inline-flex; align-items: center; gap: 7px; }
.footer__icp svg { color: var(--accent-500); }

/* ---------- 14. 子页面头部 ---------- */
.page-head {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(48px, 7vw, 78px)) 0 clamp(38px, 5vw, 56px);
  background: linear-gradient(160deg, #0a1834 0%, var(--brand-900) 55%, var(--brand-700) 100%);
  color: rgba(255, 255, 255, 0.76);
}
.page-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: radial-gradient(110% 100% at 20% 0%, #000 10%, transparent 76%);
  -webkit-mask-image: radial-gradient(110% 100% at 20% 0%, #000 10%, transparent 76%);
}
/* 子页页头加高：给下方悬浮组件（数据条 / 主控台 / 版本条 / 三问卡）留出压边空间 */
.page-head--tall { padding-bottom: clamp(76px, 10vw, 112px); }
.page-head__inner { position: relative; }
.page-head h1 { color: #fff; font-size: clamp(1.8rem, 4.2vw, 2.85rem); margin: 18px 0 14px; }
.page-head h1 em { font-style: normal; color: var(--accent-500); }
.page-head p.lede {
  max-width: 46em;
  font-size: clamp(0.96rem, 1.7vw, 1.08rem);
  color: rgba(255, 255, 255, 0.76);
  margin-bottom: 0;
}
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.52);
}
.crumb li { margin: 0; }
.crumb a { color: rgba(255, 255, 255, 0.82); }
.crumb a:hover { color: var(--accent-500); }
.crumb li + li::before { content: "/"; margin-right: 8px; opacity: 0.45; }

/* ---------- 15. 长文排版 ---------- */
.article {
  max-width: 860px;
}
.article h2 {
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  margin-top: 2.2em;
  padding-top: 0.2em;
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.article h2:first-child { margin-top: 0; }
.article h3 {
  font-size: clamp(1.08rem, 2vw, 1.25rem);
  margin-top: 1.7em;
  color: var(--brand-800);
}
.article p { color: var(--ink-600); font-size: 1rem; line-height: 1.95; }
.article ul,
.article ol { color: var(--ink-600); font-size: 1rem; line-height: 1.9; }
.article li::marker { color: var(--brand-500); font-weight: 700; }
.article a { text-decoration: underline; text-decoration-color: var(--brand-300); text-underline-offset: 3px; }
.article a:hover { text-decoration-color: var(--brand-600); }

/* 版本记录标题行：左版本号 / 日期，右下载按钮 */
.article h3.art-ver {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 1.9em;
  padding-bottom: 0.55em;
  border-bottom: 1px solid var(--line);
}
.article a.art-ver__dl {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: #fff;
  color: var(--brand-700);
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  box-shadow: var(--sh-xs);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease),
    background-color 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.article a.art-ver__dl:hover {
  color: var(--brand-800);
  background: var(--brand-50);
  border-color: var(--brand-300);
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}
.article a.art-ver__dl--new {
  border-color: transparent;
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-700) 100%);
  color: #fff;
  box-shadow: var(--sh-glow);
}
.article a.art-ver__dl--new:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-700) 100%);
  border-color: transparent;
  transform: translateY(-2px) scale(1.02);
}

.lead-quote {
  margin: 0 0 34px;
  padding: 20px 24px;
  border-left: 4px solid var(--brand-500);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  background: linear-gradient(120deg, var(--brand-50), #fff 80%);
  color: var(--ink-700);
  font-size: 0.98rem;
}
.lead-quote p:last-child { margin-bottom: 0; }

.callout {
  margin: 26px 0;
  padding: 20px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--accent-100);
  background: linear-gradient(140deg, var(--accent-50), #fff 78%);
  font-size: 0.94rem;
  color: var(--ink-600);
}
.callout strong { color: #128f4f; }
.callout p:last-child { margin-bottom: 0; }

.table-scroll { overflow-x: auto; margin: 24px 0; border-radius: var(--r-lg); border: 1px solid var(--line); }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; background: #fff; min-width: 520px; }
caption { text-align: left; padding: 14px 18px 0; font-size: 0.82rem; color: var(--ink-400); }
th, td { padding: 13px 18px; text-align: left; border-bottom: 1px solid var(--line); }
th { background: var(--brand-50); color: var(--brand-800); font-weight: 700; font-size: 0.84rem; white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: #fafcff; }

/* 锚点目录 */
.toc {
  margin: 0 0 34px;
  padding: 20px 24px;
  border-radius: var(--r-lg);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}
.toc b { display: block; font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-400); margin-bottom: 12px; }
.toc ol { margin: 0; padding-left: 1.2em; columns: 2; column-gap: 28px; font-size: 0.9rem; }
.toc li { break-inside: avoid; margin-bottom: 7px; }

/* ---------- 16. 内链卡片组 ---------- */
.link-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 12px;
}
.link-card {
  display: block;
  padding: 22px;
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--sh-xs);
  color: var(--ink-700);
  transition: transform 0.35s var(--ease-out), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease-out);
}
.link-card:hover {
  color: var(--ink-700);
  transform: translateY(-5px);
  border-color: var(--brand-200);
  box-shadow: var(--sh-md);
}
.link-card b { display: flex; align-items: center; gap: 8px; color: var(--ink-900); font-size: 1rem; margin-bottom: 6px; }
.link-card b svg { color: var(--brand-500); }
.link-card span { font-size: 0.87rem; color: var(--ink-500); }
.link-card i {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  font-size: 0.84rem;
  font-weight: 700;
  font-style: normal;
  color: var(--brand-600);
}
.link-card:hover i { color: var(--brand-700); }

/* ---------- 17. 场景入口卡 ---------- */
.ucase {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.uc {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 24px 22px 20px;
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--sh-sm);
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s var(--ease-out), border-color 0.3s var(--ease);
}
.uc::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-500), var(--accent-500));
}
.uc:nth-child(2)::before { background: linear-gradient(90deg, var(--brand-700), var(--brand-300)); }
.uc:nth-child(3)::before { background: linear-gradient(90deg, var(--gold-400), var(--gold-300)); }
.uc:nth-child(4)::before { background: linear-gradient(90deg, var(--accent-500), var(--brand-400)); }
.uc:hover { transform: translateY(-6px); box-shadow: var(--sh-lg); border-color: var(--brand-200); }
.uc__q {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ink-900);
  margin-bottom: 10px;
}
.uc__q svg { flex: 0 0 auto; margin-top: 3px; color: var(--brand-500); }
.uc__a { font-size: 0.89rem; line-height: 1.78; color: var(--ink-500); margin: 0 0 14px; }
.uc__chips { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.uc__chips li {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--brand-700);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  border-radius: var(--r-pill);
  padding: 4px 10px;
}
.uc__go {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--brand-600);
}
.uc__go svg { transition: transform 0.35s var(--ease-out); }
.uc:hover .uc__go svg { transform: translateX(4px); }

/* ---------- 18. 横向步骤条 ---------- */
.stepper {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.stepper::before {
  content: "";
  position: absolute;
  top: 23px;
  left: 12%;
  right: 12%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand-200), var(--accent-300), var(--gold-300));
}
.stp { position: relative; padding: 0 18px; text-align: center; }
.stp__no {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--brand-200);
  color: var(--brand-600);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 900;
  box-shadow: 0 0 0 7px #fff;
  transition: transform 0.4s var(--ease-out), border-color 0.3s var(--ease);
}
.stp:hover .stp__no { transform: scale(1.08); }
.stp:nth-child(2) .stp__no { border-color: var(--accent-100); color: var(--accent-600); }
.stp:nth-child(3) .stp__no { border-color: var(--gold-300); color: var(--gold-500); }
.stp:nth-child(4) .stp__no { border-color: var(--accent-100); color: var(--accent-600); }
.stp__t { margin: 16px 0 7px; font-size: 1rem; color: var(--ink-900); }
.stp__d { margin: 0; font-size: 0.87rem; line-height: 1.72; color: var(--ink-500); }
.stp__d a { color: var(--brand-600); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--brand-300); }

/* ---------- 19. 工具墙 ---------- */
.tools {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.tcol {
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px 18px 18px;
  transition: transform 0.45s var(--ease-out), box-shadow 0.45s var(--ease-out), border-color 0.3s var(--ease);
}
.tcol:hover { transform: translateY(-4px); border-color: var(--brand-200); box-shadow: var(--sh-md); }
.tcol__hd {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px dashed var(--line-strong);
}
.tcol__hd i {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: var(--brand-50);
  color: var(--brand-600);
}
.tcol:nth-child(2) .tcol__hd i { background: var(--accent-50); color: var(--accent-600); }
.tcol:nth-child(3) .tcol__hd i { background: var(--gold-100); color: var(--gold-500); }
.tcol:nth-child(4) .tcol__hd i { background: var(--brand-900); color: #fff; }
.tcol__hd b { font-size: 0.98rem; color: var(--ink-900); }
.tcol__hd em {
  margin-left: auto;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 800;
  color: var(--ink-400);
}
.tcol ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.tcol li {
  font-size: 0.79rem;
  color: var(--ink-600);
  background: var(--surface-soft);
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  padding: 5px 11px;
  transition: background-color 0.28s var(--ease), color 0.28s var(--ease), border-color 0.28s var(--ease);
}
.tcol li:hover { background: var(--brand-50); color: var(--brand-700); border-color: var(--brand-100); }

/* ---------- 20. 前后对照 ---------- */
.vs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--sh-sm);
}
.vs__col { padding: clamp(24px, 3.4vw, 38px); }
.vs__col--before { background: #fbfcfe; }
.vs__col--after {
  background: linear-gradient(155deg, var(--brand-50), #ffffff 72%);
  border-left: 1px solid var(--line);
}
.vs__hd {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--ink-400);
  margin-bottom: 16px;
}
.vs__col--after .vs__hd { color: var(--brand-600); }
.vs__col h3 { font-size: clamp(1.05rem, 1.9vw, 1.22rem); margin-bottom: 16px; }
.vs__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 11px; }
.vs__col li { display: flex; gap: 10px; align-items: flex-start; font-size: 0.91rem; line-height: 1.72; color: var(--ink-600); }
.vs__col li svg { flex: 0 0 auto; margin-top: 5px; }
.vs__col--before li svg { color: var(--ink-300); }
.vs__col--after li svg { color: var(--accent-600); }

/* ---------- 21. 做 / 不做：样式已并入第 8 节 .pd 系列 ---------- */

/* ---------- 22. 横向历程轨道 ---------- */
.track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 1fr);
  gap: 14px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 4px 2px 16px;
  scrollbar-width: thin;
}
.track::-webkit-scrollbar { height: 6px; }
.track::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 99px; }
.tk {
  scroll-snap-align: start;
  background: var(--surface-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 22px 20px 20px;
  transition: transform 0.45s var(--ease-out), box-shadow 0.45s var(--ease-out), border-color 0.3s var(--ease);
}
.tk:hover { transform: translateY(-5px); border-color: var(--brand-200); box-shadow: var(--sh-md); }
.tk__y {
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--brand-700);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
  border-radius: var(--r-pill);
  padding: 3px 12px;
  margin-bottom: 12px;
}
.tk h3 { font-size: 1rem; margin-bottom: 8px; }
.tk p { margin: 0; font-size: 0.88rem; line-height: 1.75; color: var(--ink-500); }
.track-hint { font-size: 0.8rem; color: var(--ink-400); margin: 0 0 14px; }

/* ---------- 23. 滚动动效 ---------- */
/* 首屏直出原则：默认所有 [data-reveal] 可见，绝不被 JS 预先隐藏。
   只有 JS 判定「在首屏以下」的元素才会被加上 .pre-reveal 才进入
   「先隐藏、滚动进入时淡入」流程，因此进入页面时首屏内容立即显示，
   不会出现空白 / 黑屏闪烁。
   用独立的 translate 属性代替 transform 做位移：
   两者的优先级分开计算，reveal 结束时不会再盖掉卡片自身的 hover 位移。 */
[data-reveal].pre-reveal {
  opacity: 0;
  translate: 0 22px;
  transition: opacity 0.7s var(--ease-out), translate 0.7s var(--ease-out);
  will-change: opacity, translate;
}
[data-reveal].pre-reveal.is-visible { opacity: 1; translate: none; }
[data-reveal].pre-reveal[data-delay="1"] { transition-delay: 0.08s; }
[data-reveal].pre-reveal[data-delay="2"] { transition-delay: 0.16s; }
[data-reveal].pre-reveal[data-delay="3"] { transition-delay: 0.24s; }
[data-reveal].pre-reveal[data-delay="4"] { transition-delay: 0.32s; }
[data-reveal].pre-reveal[data-delay="5"] { transition-delay: 0.4s; }

/* ==========================================================================
   23.5  子页差异化组件
   四个子页各用一套不同的版式，避免"同一个模板换文字"的观感：
     features  → 工具陈列馆（数据条 + 锚点条 + 图标卡片墙 + 理由卡）
     download  → 下载工作台（左停靠主控台 + 步骤流 + 品牌路径 + 排障卡）
     changelog → 版本时间线（sticky 年份导航 + 版本卡 + 三色标签）
     faq       → 问答控制台（快速三问卡 + 分类侧栏 + 手风琴）
   ========================================================================== */

/* ---------- 通用：抬升到深色页头之上 ---------- */
/* 用在 page-head 后面的第一个 section 上，让里面的组件悬浮压住深色底 */
.section--lift { padding-top: 0; }

/* ---------- 通用：宽版长文容器（放卡片墙用） ---------- */
/* 与首页 .wrap 同宽，保证所有子页面主体内容区和首页对齐 */
.article--wide { max-width: var(--wrap); }

/* ---------- 通用：锚点跳转条 ---------- */
.jumpline {
  position: sticky;
  top: calc(var(--header-h) + 8px);
  z-index: 40;
  margin: 0 0 30px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--sh-md);
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.jumpline::-webkit-scrollbar { display: none; }
.jumpline a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 17px;
  border-radius: var(--r-pill);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-600);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.22s var(--ease), color 0.22s var(--ease);
}
.jumpline a i {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 7px;
  background: var(--brand-50);
  color: var(--brand-600);
  font-style: normal;
  font-size: 0.72rem;
  font-weight: 800;
}
.jumpline a:hover { background: var(--brand-50); color: var(--brand-700); }
.jumpline a:hover i { background: var(--brand-500); color: #fff; }

/* ---------- 通用：侧栏 + 主体 两栏 ---------- */
.split {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 38px;
  align-items: start;
}
.split__side {
  position: sticky;
  top: calc(var(--header-h) + 30px);
}

/* ==========================================================================
   A. features.html —— 工具陈列馆
   ========================================================================== */

/* 数据速览条 */
.fstrip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: -52px 0 40px;
  padding: 20px;
  list-style: none;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--r-xl);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: 0 26px 58px -30px rgba(11, 27, 61, 0.55), var(--sh-sm);
}
.fstrip li {
  padding: 6px 14px;
  border-left: 1px solid var(--line);
}
.fstrip li:first-child { border-left: 0; }
.fstrip b {
  display: block;
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink-900);
}
.fstrip b em {
  font-style: normal;
  font-size: 0.46em;
  font-weight: 800;
  margin-left: 4px;
  color: var(--brand-500);
}
.fstrip span {
  display: block;
  margin-top: 4px;
  font-size: 0.82rem;
  color: var(--ink-500);
}

/* 工具分组墙 */
.tilewall { margin: 0 0 44px; scroll-margin-top: calc(var(--header-h) + 24px); }
.tilewall__hd {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 20px;
}
.tilewall__no {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(145deg, var(--brand-500), var(--brand-700));
  color: #fff;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  box-shadow: var(--sh-glow);
}
.tilewall__txt { min-width: 0; }
.tilewall__txt h2 {
  margin: 0;
  font-size: clamp(1.12rem, 2.2vw, 1.42rem);
}
.tilewall__txt p {
  margin: 2px 0 0;
  font-size: 0.9rem;
  color: var(--ink-500);
}
.tilewall__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.tilewall__grid--c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tilewall__grid--c4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.tile {
  position: relative;
  padding: 20px 19px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  box-shadow: var(--sh-xs);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease), translate 0.3s var(--ease);
}
.tile:hover { border-color: var(--brand-200); box-shadow: var(--sh-md); translate: 0 -4px; }
.tile__ico {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 13px;
  border-radius: 13px;
  background: linear-gradient(145deg, var(--brand-50), #fff);
  border: 1px solid var(--brand-100);
  color: var(--brand-600);
}
.tile--green .tile__ico {
  background: linear-gradient(145deg, var(--accent-50), #fff);
  border-color: var(--accent-100);
  color: var(--accent-600);
}
.tile--gold .tile__ico {
  background: linear-gradient(145deg, var(--gold-100), #fff);
  border-color: var(--gold-300);
  color: var(--gold-500);
}
.tile h3 {
  margin: 0 0 5px;
  font-size: 1.02rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tile__tag {
  flex: 0 0 auto;
  padding: 2px 9px;
  border-radius: var(--r-pill);
  background: var(--accent-50);
  border: 1px solid var(--accent-100);
  color: #128f4f;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.tile p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--ink-500);
}

/* 值得装的三个理由 */
.whygrid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 26px;
}
.why {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--surface-card);
  box-shadow: var(--sh-sm);
}
.why::after {
  content: "";
  position: absolute;
  right: -46px;
  top: -46px;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(82, 142, 241, 0.16), transparent 68%);
}
.why:nth-child(2)::after { background: radial-gradient(circle, rgba(50, 221, 130, 0.18), transparent 68%); }
.why:nth-child(3)::after { background: radial-gradient(circle, rgba(255, 203, 75, 0.22), transparent 68%); }
.why__ico {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--brand-50);
  color: var(--brand-600);
  margin-bottom: 14px;
}
.why:nth-child(2) .why__ico { background: var(--accent-50); color: var(--accent-600); }
.why:nth-child(3) .why__ico { background: var(--gold-100); color: var(--gold-500); }
.why h3 { margin: 0 0 8px; font-size: 1.06rem; }
.why__num {
  display: block;
  margin: 0 0 10px;
  font-size: 1.62rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink-900);
  line-height: 1.1;
}
.why__num em { font-style: normal; font-size: 0.5em; color: var(--ink-400); margin-left: 3px; }
.why p { margin: 0; font-size: 0.9rem; line-height: 1.82; color: var(--ink-500); }

@media (max-width: 1060px) {
  .fstrip { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; }
  .fstrip li:nth-child(3) { border-left: 0; }
  .fstrip li:nth-child(n+3) { border-top: 1px solid var(--line); padding-top: 14px; }
  .whygrid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .fstrip { margin-top: -34px; padding: 14px; }
  .tilewall__hd { gap: 12px; }
  .tilewall__no { width: 44px; height: 44px; border-radius: 13px; font-size: 0.95rem; }
  /* 小屏上分组描述容易挤成两行拖长页面，直接收掉不影响理解 */
  .tilewall__txt p { display: none; }
}

/* ==========================================================================
   B. download.html —— 下载工作台
   ========================================================================== */

/* 主控台：左右两栏等高，右栏参数表跟手机底部齐平。
   左栏只要能拢住一台 318px 的机身就行，剩下的宽度全给参数表——
   原来的 0.9fr 会白白浪费 180px，右卡反而挤在中间显得又窄又空 */
.dock {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: 22px;
  align-items: stretch;
  margin: -52px 0 34px;
}
/* 左侧只站一台手机，不套白卡：机身自己就是容器。
   垫一层很淡的光斑，免得深色机身和下面的浅底糊在一起。 */
.dock__phone { position: relative; display: grid; place-items: center; }
.dock__phone::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 48%;
  width: min(440px, 100%);
  height: min(580px, 110%);
  translate: -50% -50%;
  background: radial-gradient(ellipse at center, rgba(82, 142, 241, 0.22), rgba(82, 142, 241, 0.07) 50%, transparent 72%);
  pointer-events: none;
}
/* 下载页的机身比首页短一档：这里是示意图不是主角，
   拉太长会让屏幕中间空出一大块 */
.dock__phone .phone { position: relative; width: min(318px, 74vw); aspect-ratio: 9 / 16; }
/* 屏幕内的留白均摊到各内容块之间，而不是全堆在底部按钮上方 */
.dock__phone .phone__screen { justify-content: space-between; gap: 0; }
.dock__phone .phone__bar { margin-top: 0; }

/* 右侧参数表：一张连续列表，分组 + 细分隔线，
   替掉原来八个各自带底的独立小卡（那看着像加载骨架） */
.dock__facts {
  display: flex;
  flex-direction: column;
  padding: 24px 28px 26px;
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background: var(--surface-card);
  box-shadow: var(--sh-md);
}
/* 表头与参数行一起往外撑 14px：这样文字、图标、右侧取值都落在卡片的
   内容框上（顶部标签和值贴同一条竖线），分隔线也统一多出 14px */
.dock__facts-hd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-inline: -14px;
  padding: 0 14px 16px;
  border-bottom: 1px solid var(--line);
}
.dock__facts-hd h2 {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}
.dock__facts-tag {
  flex: 0 0 auto;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  font-size: 0.7rem;
  font-weight: 700;
  white-space: nowrap;
  color: var(--brand-700);
  background: var(--brand-50);
  border: 1px solid var(--brand-100);
}
.factlist {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
}
.factgrp { display: flex; flex-direction: column; }
.factgrp__k {
  margin: 0 0 8px 1px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--ink-400);
}
.factgrp dl { margin: 0 -14px; display: grid; gap: 2px; }
.factgrp dl > div {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  transition: background 0.22s var(--ease);
}
/* 行与行之间不再画线：整张卡只留「表头 — 首行」一条实线，
   分组交给小标题 + 留白，定位交给 hover，比叠线干净得多 */
.factgrp dl > div:hover { background: var(--brand-50); }
.factgrp svg { flex: 0 0 auto; color: var(--brand-600); }
/* 标签与取值之间只用留白拉开，不再补引导线（线和行底叠一起太吵） */
.factgrp dt {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.9rem;
  color: var(--ink-500);
}
.factgrp dd {
  margin: 0;
  flex: 0 0 auto;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}
.factgrp dd em {
  font-style: normal;
  font-weight: 700;
  font-size: 0.72rem;
  color: var(--accent-600);
}

/* 官方地址条 */
.srcbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 16px;
  padding: 15px 18px;
  border: 1px dashed var(--brand-300);
  border-radius: var(--r-lg);
  background: var(--brand-50);
}
.srcbar__key {
  flex: 0 0 auto;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  background: var(--brand-500);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}
.srcbar code {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--brand-800);
  word-break: break-all;
}

/* 安装步骤流 */
.howto {
  display: grid;
  gap: 12px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}
.howto > li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  box-shadow: var(--sh-xs);
  list-style: none;
  transition: border-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}
.howto > li:hover { border-color: var(--brand-200); box-shadow: var(--sh-sm); }
.howto__no {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(145deg, var(--brand-500), var(--brand-700));
  color: #fff;
  font-size: 1.28rem;
  font-weight: 800;
  box-shadow: var(--sh-glow);
}
.howto__no svg { width: 26px; height: 26px; }
.howto__bd { min-width: 0; }
.howto__bd h4 { margin: 6px 0 7px; font-size: 1.05rem; }
.howto__bd p { margin: 0; font-size: 0.9rem; line-height: 1.85; color: var(--ink-500); }
.howto__tip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 11px;
  padding: 7px 13px;
  border-radius: var(--r-pill);
  background: var(--gold-100);
  border: 1px solid var(--gold-300);
  color: #8a6100;
  font-size: 0.8rem;
  font-weight: 600;
}
.howto__tip svg { color: var(--gold-500); flex: 0 0 auto; }

/* 各品牌授权路径 */
.brandpath { display: grid; gap: 8px; margin: 0 0 18px; }
.bcard {
  position: relative;
  display: grid;
  grid-template-columns: 196px minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  padding: 13px 20px 13px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface-card);
  box-shadow: var(--sh-xs);
  overflow: hidden;
  transition: border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}
.bcard:hover { border-color: var(--brand-200); box-shadow: var(--sh-sm); }
.bcard::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--bc, var(--brand-500));
}
.bcard b {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.94rem;
  color: var(--ink-900);
}
.bcard b::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bc, var(--brand-500));
}
.bcard span { font-size: 0.85rem; line-height: 1.7; color: var(--ink-500); }

/* 排障：症状 → 做法 */
.diag { display: grid; gap: 12px; margin: 0 0 18px; padding: 0; list-style: none; }
.diag > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 26px minmax(0, 1.15fr);
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  list-style: none;
  box-shadow: var(--sh-xs);
}
.diag__sym {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--ink-900);
}
.diag__sym svg { flex: 0 0 auto; margin-top: 3px; color: #e08a2a; }
.diag__arrow { display: grid; place-items: center; color: var(--ink-300); }
.diag__fix {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.89rem;
  line-height: 1.8;
  color: var(--ink-500);
}
.diag__fix svg { flex: 0 0 auto; margin-top: 4px; color: var(--accent-600); }

/* 正版三招 */
.checklist { display: grid; gap: 10px; margin: 0 0 18px; padding: 0; list-style: none; }
.checklist > li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--surface-card);
  list-style: none;
  box-shadow: var(--sh-xs);
}
.checklist__no {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: var(--accent-50);
  border: 1px solid var(--accent-100);
  color: var(--accent-600);
}
.checklist strong { display: block; margin-bottom: 3px; color: var(--ink-900); font-size: 0.98rem; }
.checklist span { font-size: 0.89rem; line-height: 1.8; color: var(--ink-500); }

@media (max-width: 1060px) {
  /* 单栏：手机与参数表各自居中排成一条中轴，
     参数表不再拉满整屏（否则标签和值会隔出半屏距离） */
  .dock { grid-template-columns: 1fr; gap: 28px; margin-top: -34px; }
  .dock__facts { width: 100%; max-width: 640px; margin-inline: auto; padding: 20px 20px 22px; }
  .factlist { gap: 16px; }
}
@media (max-width: 640px) {
  .howto > li { grid-template-columns: 44px minmax(0, 1fr); gap: 13px; padding: 16px; }
  .howto__no { width: 44px; height: 44px; border-radius: 14px; font-size: 1.05rem; }
  .howto__no svg { width: 22px; height: 22px; }
  .howto__bd h4 { margin-top: 0; }
  .srcbar { flex-direction: column; align-items: flex-start; gap: 9px; }
  .diag > li { grid-template-columns: 1fr; gap: 10px; }
  .diag__arrow { display: none; }
}

/* ==========================================================================
   C. changelog.html —— 版本时间线
   ========================================================================== */

/* 版本号怎么读 */
.semver {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0 0 26px;
}
.semver__card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  box-shadow: var(--sh-xs);
}
.semver__card b {
  display: inline-grid;
  place-items: center;
  min-width: 44px;
  height: 44px;
  padding: 0 10px;
  margin-bottom: 12px;
  border-radius: 13px;
  font-size: 1.32rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
  background: linear-gradient(145deg, var(--brand-500), var(--brand-700));
}
.semver__card:nth-child(2) b { background: linear-gradient(145deg, var(--brand-400), var(--brand-600)); }
.semver__card:nth-child(3) b { background: linear-gradient(145deg, var(--gold-400), var(--gold-500)); color: var(--brand-950); }
.semver__card h3 { margin: 0 0 6px; font-size: 1rem; }
.semver__card p { margin: 0; font-size: 0.88rem; line-height: 1.78; color: var(--ink-500); }

/* 年份侧栏 + 版本流 */
.rl-side {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  box-shadow: var(--sh-sm);
}
.rl-side h3 {
  margin: 0 0 14px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-400);
}
.rl-side ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 4px; }
.rl-side a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border-radius: var(--r-sm);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-600);
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease);
}
.rl-side a:hover { background: var(--brand-50); color: var(--brand-700); }
.rl-side a i {
  display: grid;
  place-items: center;
  min-width: 34px;
  height: 26px;
  padding: 0 7px;
  border-radius: 8px;
  background: var(--surface-soft);
  font-style: normal;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--brand-700);
}
.rl-side a em {
  margin-left: auto;
  font-style: normal;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink-400);
}

.rl-body { position: relative; padding-left: 6px; }
.rl-card {
  position: relative;
  margin: 0 0 16px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  box-shadow: var(--sh-xs);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.rl-card:hover { border-color: var(--brand-200); box-shadow: var(--sh-md); }
.rl-card::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 30px;
  bottom: -16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand-200), var(--line));
}
.rl-card:last-child::before { display: none; }
.rl-card::after {
  content: "";
  position: absolute;
  left: -11px;
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--brand-500);
  box-shadow: 0 0 0 4px rgba(82, 142, 241, 0.12);
}
.rl-card--major::after { border-color: var(--gold-400); box-shadow: 0 0 0 5px rgba(255, 203, 75, 0.2); }
.rl-card__hd {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}
.rl-card__ver {
  font-size: clamp(1.22rem, 2.6vw, 1.58rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink-900);
}
.rl-card__date { font-size: 0.85rem; color: var(--ink-400); font-weight: 600; }
.rl-card__badge {
  padding: 3px 11px;
  border-radius: var(--r-pill);
  background: linear-gradient(135deg, var(--accent-500), var(--accent-600));
  color: #fff;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}
.rl-card__badge--major {
  background: linear-gradient(135deg, var(--gold-400), var(--gold-500));
  color: var(--brand-950);
}
.rl-card__dl {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--brand-200);
  background: var(--brand-50);
  color: var(--brand-700);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease), translate 0.22s var(--ease);
}
.rl-card__dl:hover { background: var(--brand-500); color: #fff; translate: 0 -2px; }
.rl-card__note {
  margin: 0 0 14px;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink-600);
}
.rl-card ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.rl-card ul li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--ink-600);
}
.rl-tag {
  margin-top: 4px;
  display: inline-grid;
  place-items: center;
  height: 22px;
  border-radius: 7px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}
.rl-tag--new { background: var(--accent-50); border: 1px solid var(--accent-100); color: #128f4f; }
.rl-tag--opt { background: var(--brand-50); border: 1px solid var(--brand-100); color: var(--brand-700); }
.rl-tag--fix { background: var(--gold-100); border: 1px solid var(--gold-300); color: #8a6100; }

/* 更新节奏 */
.cadence { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.cadence > li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 15px;
  align-items: start;
  padding: 17px 19px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface-card);
  list-style: none;
}
.cadence b {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 13px;
  background: var(--surface-soft);
  color: var(--brand-600);
}
.cadence strong { display: block; margin-bottom: 3px; color: var(--ink-900); font-size: 0.98rem; }
.cadence span { font-size: 0.88rem; line-height: 1.8; color: var(--ink-500); }

@media (max-width: 1060px) {
  .semver { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 22px; }
  .split__side { position: static; }
  .rl-side ol { display: flex; flex-wrap: wrap; gap: 6px; }
  .rl-side a { padding: 7px 12px; background: var(--surface-soft); }
  .rl-side a em { margin-left: 0; }
}
@media (max-width: 560px) {
  .rl-card { padding: 18px 16px; }
  .rl-card__hd { gap: 8px; }
  .rl-card__dl { margin-left: 0; width: 100%; justify-content: center; }
  .rl-card ul li { grid-template-columns: 46px minmax(0, 1fr); gap: 9px; }
}

/* ==========================================================================
   D. faq.html —— 问答控制台
   ========================================================================== */

/* 快速三问 */
.quick3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: -52px 0 34px;
}
.qcard {
  position: relative;
  overflow: hidden;
  padding: 22px 22px 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-xl);
  background: linear-gradient(150deg, var(--brand-900) 0%, var(--brand-800) 58%, var(--brand-950) 100%);
  box-shadow: 0 26px 56px -30px rgba(11, 27, 61, 0.7);
}
.qcard::after {
  content: "";
  position: absolute;
  left: -30px;
  top: -46px;
  width: 150px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(82, 142, 241, 0.34), transparent 68%);
  pointer-events: none;
}
.qcard > * { position: relative; }
.qcard__q {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
  font-size: 0.92rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.82);
}
.qcard__q svg { flex: 0 0 auto; color: var(--accent-300); }
.qcard__a {
  display: block;
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: #fff;
}
.qcard p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.78;
  color: rgba(255, 255, 255, 0.66);
}

/* 分类侧栏 */
.faqside {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface-card);
  box-shadow: var(--sh-sm);
}
.faqside h3 {
  margin: 0 0 13px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-400);
}
.faqside ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 4px; }
.faqside a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 11px;
  border-radius: var(--r-sm);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-600);
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease);
}
.faqside a:hover { background: var(--brand-50); color: var(--brand-700); }
.faqside a i {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--brand-50);
  color: var(--brand-600);
  font-style: normal;
  font-size: 0.76rem;
  font-weight: 800;
}
.faqside a em {
  margin-left: auto;
  font-style: normal;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink-400);
}
.faqside__cta {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--ink-500);
}

/* 手风琴增强 */
.faqgroup { margin: 0 0 26px; }
.faqgroup__hd {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.faqgroup__no {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: linear-gradient(145deg, var(--brand-500), var(--brand-700));
  color: #fff;
  font-size: 0.92rem;
  font-weight: 800;
}
.faqgroup__hd h3 { margin: 0; font-size: 1.16rem; }
.faq .faq__body ul { margin: 0 0 0.7em; padding-left: 1.15em; }
.faq .faq__body li { margin-bottom: 6px; font-size: 0.9rem; line-height: 1.8; color: var(--ink-500); }
.faq .faq__body a { text-decoration: underline; text-decoration-color: var(--brand-300); text-underline-offset: 3px; }

/* 没找到答案 */
.helpbox {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  padding: 26px 28px;
  border: 1px solid var(--brand-100);
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, var(--brand-50), #fff 65%);
}
.helpbox h3 { margin: 0 0 7px; font-size: 1.22rem; }
.helpbox p { margin: 0; font-size: 0.92rem; color: var(--ink-600); }
.helpbox__acts { display: flex; gap: 10px; flex-wrap: wrap; }

@media (max-width: 1060px) {
  .quick3 { grid-template-columns: 1fr; margin-top: -34px; }
  .faqside ol { display: flex; flex-wrap: wrap; gap: 6px; }
  .faqside a { padding: 7px 12px; background: var(--surface-soft); }
  .faqside a em { margin-left: 0; }
  .faqside__cta { display: none; }
  .helpbox { grid-template-columns: 1fr; }
}

/* 卡片墙与品牌路径的降列统一放在这里：
   断点覆盖必须排在所有基础规则之后，否则窄屏的 1 列会被宽屏断点的 2 列反盖。 */
@media (max-width: 1060px) {
  .tilewall__grid,
  .tilewall__grid--c3,
  .tilewall__grid--c4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .tilewall__grid,
  .tilewall__grid--c3,
  .tilewall__grid--c4 { grid-template-columns: 1fr; }
  .bcard { grid-template-columns: 1fr; gap: 4px; padding: 14px 18px; }
}

/* ---------- 23.6 无障碍辅助文本 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 23.7 手机预览 · 深框版 ---------- */
/* 首页的 phone 是浅色玻璃框压在深色背景上；
   download 页反过来——深框压在浅色主控台上，同一套语言换个方向用。 */
.phone--dark {
  background: linear-gradient(160deg, #24365e 0%, var(--brand-950) 62%, #0a152e 100%);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 34px 64px -30px rgba(11, 27, 61, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.phone--dark .phone__notch { background: rgba(255, 255, 255, 0.42); }
.phone--dark .phone__tile { box-shadow: 0 3px 10px -4px rgba(30, 65, 137, 0.28); }

/* 工具卡当链接用时，去掉正文链接的下划线 */
a.tile { display: block; text-decoration: none; }
a.tile:hover h3 { color: var(--brand-700); }
a.tile h3 { transition: color 0.24s var(--ease); }

/* ---------- 23.7.1 版本时间线 · changelog 页专属 ---------- */
.nowbar {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 22px;
  margin: -52px 0 34px;
  padding: 26px 30px;
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, var(--brand-950) 0%, var(--brand-900) 46%, var(--brand-700) 100%);
  box-shadow: var(--sh-lg);
}
.nowbar::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -80px;
  width: 260px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(82, 142, 241, 0.4), transparent 68%);
  pointer-events: none;
}
.nowbar > * { position: relative; }
.nowbar__k {
  display: block;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-300);
  margin-bottom: 4px;
}
.nowbar__ver {
  display: block;
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: #fff;
}
.nowbar__meta {
  display: block;
  margin-top: 5px;
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.66);
}
.nowbar__acts { text-align: right; }
.nowbar__note {
  display: block;
  margin-top: 9px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
}

.rl-year {
  margin: 30px 0 16px !important;
  padding-left: 22px;
  position: relative;
  font-size: 1.05rem !important;
  color: var(--brand-800) !important;
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.rl-year::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  translate: 0 -50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand-500);
  box-shadow: 0 0 0 4px var(--brand-100);
}

.table-scroll--cmp {
  border-color: var(--brand-100);
  box-shadow: var(--sh-sm);
  background: #fff;
}
.table-scroll--cmp tbody td:last-child { color: #128f4f; font-weight: 600; }
.table-scroll--cmp tbody tr:hover td { background: #f7fbff; }

@media (max-width: 640px) {
  .nowbar { margin-top: -34px; padding: 20px; }
  .nowbar__acts { text-align: left; width: 100%; }
  .nowbar__acts .btn { width: 100%; justify-content: center; }
}

/* ---------- 23.8 悬浮下载按钮（全站通用） ---------- */
/* 固定右下角。出场动效走 translate / scale 两个独立属性：
   .js .floatdl.is-shown 的权重高于 :hover，若把 hover 位移也写成 translate，
   悬停位移会被「已显示」状态盖掉，所以 hover 用 scale。 */
.floatdl {
  /* 两套配色：浅色正文区用品牌蓝底白字，压在深色页头/首屏上时反过来用实底白卡深字
     （半透明浅色玻璃压深底会发糊，深色实底又会跟页头糊在一起，只有白卡分得开）。
     由 JS 跟随顶栏状态给 <html> 挂 .is-dark-region。 */
  --fdl-bg: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-700) 100%);
  --fdl-fg: #ffffff;
  --fdl-sub: rgba(255, 255, 255, 0.76);
  --fdl-gloss: rgba(255, 255, 255, 0.3);
  --fdl-sh: var(--sh-glow), 0 14px 30px -18px rgba(11, 27, 61, 0.8);

  position: fixed;
  right: clamp(16px, 3vw, 30px);
  bottom: calc(clamp(16px, 3vw, 30px) + env(safe-area-inset-bottom, 0px));
  z-index: 90;                     /* 压在正文之上、顶栏（100）之下，展开的移动菜单盖得住它 */
  display: inline-flex;
  align-items: center;
  gap: 11px;
  padding: 11px 21px 11px 17px;
  border-radius: var(--r-pill);
  background: var(--fdl-bg);
  color: var(--fdl-fg);
  box-shadow: var(--fdl-sh);
  overflow: hidden;
  transition: opacity 0.32s var(--ease), translate 0.36s var(--ease-out),
    scale 0.2s var(--ease), box-shadow 0.28s var(--ease), filter 0.28s var(--ease),
    visibility 0.32s var(--ease);
}
html.is-dark-region .floatdl {
  --fdl-bg: linear-gradient(135deg, #ffffff 0%, #eaf1ff 100%);
  --fdl-fg: var(--brand-700);
  --fdl-sub: rgba(47, 95, 184, 0.72);
  --fdl-gloss: rgba(255, 255, 255, 0.9);
  --fdl-sh: 0 18px 40px -18px rgba(4, 12, 30, 0.85), 0 2px 8px rgba(4, 12, 30, 0.28);
}
/* 斜向高光：和顶栏下载按钮同一套质感 */
.floatdl::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, var(--fdl-gloss), rgba(255, 255, 255, 0) 48%);
  pointer-events: none;
}
.floatdl > * { position: relative; }
.floatdl__icon { flex: 0 0 auto; color: currentColor; }
.floatdl__txt { display: grid; gap: 1px; text-align: left; }
.floatdl__txt b {
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--fdl-fg);
}
.floatdl__txt i {
  font-style: normal;
  font-size: 0.72rem;
  line-height: 1.3;
  color: var(--fdl-sub);
}
.floatdl:hover {
  scale: 1.04;
  filter: brightness(1.06);
  box-shadow: 0 22px 44px -18px rgba(82, 142, 241, 0.85), 0 14px 30px -18px rgba(11, 27, 61, 0.8);
}
html.is-dark-region .floatdl:hover {
  box-shadow: 0 22px 46px -18px rgba(4, 12, 30, 0.9), 0 2px 10px rgba(4, 12, 30, 0.3);
}
.floatdl:active { scale: 0.98; }

/* 未启用 JS 时按钮直接常驻；启用后交给脚本按滚动位置出场 */
.js .floatdl { opacity: 0; translate: 0 22px; pointer-events: none; visibility: hidden; }
.js .floatdl.is-shown { opacity: 1; translate: 0 0; pointer-events: auto; visibility: visible; }

/* ---------- 24. 响应式 ---------- */
/* 中等桌面宽度下容器已贴边，索引不再向外悬挂，避免顶到屏幕边缘 */
@media (max-width: 1240px) {
  .hero__rail { right: 0; }
}
@media (max-width: 1060px) {
  .hero__rail { display: none; }
  .footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ucase { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tools { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .track { grid-auto-columns: minmax(232px, 44%); }
  .rv { grid-template-columns: 1fr; }
  .rv-sum { position: static; }
}

@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; margin-bottom: 8px; }
  .phone { width: min(258px, 62vw); }
  .float-card--a { left: 0; top: 7%; }
  .float-card--b { right: 0; bottom: 11%; }
  .about-panel { grid-template-columns: 1fr; }
  .about-story { border-right: 0; border-bottom: 1px solid var(--line); }
  .about-pledge { grid-template-rows: none; }
  .dl-panel__grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stepper { grid-template-columns: 1fr; gap: 24px; }
  .stepper::before { display: none; }
  .stp { padding: 0 0 0 66px; text-align: left; }
  .stp__no { position: absolute; left: 0; top: 0; box-shadow: 0 0 0 5px #fff; }
  .stp__t { margin-top: 2px; }
  .vs { grid-template-columns: 1fr; }
  .vs__col--after { border-left: 0; border-top: 1px solid var(--line); }
  .track { grid-auto-columns: minmax(240px, 62%); }
  .track-hint { display: block; }
}

@media (max-width: 560px) {
  .float-card { padding: 8px 12px; gap: 8px; font-size: 0.7rem; }
  .float-card i { width: 26px; height: 26px; border-radius: 8px; }
  .float-card small { font-size: 0.6rem; }
  .float-card svg { width: 13px; height: 13px; }
  .float-card--a { top: 4%; }
  .float-card--b { bottom: 13%; }
}

@media (max-width: 820px) {
  :root { --header-h: 62px; }
  .nav-toggle { display: inline-flex; }
  .header__cta { display: none; }
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    margin: 0;
    padding: 12px var(--gutter) 20px;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 22px 44px -26px rgba(13, 21, 38, 0.4);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.32s var(--ease), opacity 0.32s var(--ease), visibility 0.32s;
  }
  .nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav__link {
    color: var(--ink-700);
    padding: 13px 16px;
    border-radius: var(--r-md);
    font-size: 1rem;
  }
  .nav__link:hover, .nav__link[aria-current="page"] { color: var(--brand-700); background: var(--brand-50); }
  .nav__list .nav__cta-item { display: block; margin-top: 10px; }
  .nav__list .nav__cta-item .btn { width: 100%; }
  .toc ol { columns: 1; }
  .section { padding: clamp(48px, 11vw, 76px) 0; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .ver { grid-template-columns: 1fr; gap: 12px; }
  .ver__side {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }
  .ver__side .ver__badge { justify-self: start; }
  .ver__side .ver__dl { flex: 0 0 auto; }
  .article h3.art-ver { align-items: flex-start; }
  .stats { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr; gap: 30px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .sec-head { grid-template-columns: 1fr; gap: 12px; }
  .sec-head__num { grid-row: auto; margin-top: 0; min-width: 32px; height: 32px; border-radius: 10px; font-size: 0.78rem; }
  .ucase { grid-template-columns: 1fr; }
  .tools { grid-template-columns: 1fr; }
  .track { grid-auto-columns: minmax(240px, 82%); }
  .rv-list { columns: 1; }
}

/* ---------- 25. 动效降级 / 打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal].pre-reveal { opacity: 1; translate: none; will-change: auto; }
}

/* 窄屏上这颗按钮只留图标 + 主文案，别让副标题把它撑成两行 */
@media (max-width: 620px) {
  .floatdl__txt i { display: none; }
  .floatdl { padding: 10px 18px 10px 15px; }
}

@media print {
  .site-header, .nav-toggle, .hero__glow, .phone, .float-card, .floatdl { display: none !important; }
  body { background: #fff; color: #000; }
  .hero, .page-head, .section--ink, .site-footer, .dl-panel {
    background: #fff !important; color: #000 !important; box-shadow: none !important;
  }
  .hero__title, .page-head h1, .section--ink h2, .dl-panel h2 { color: #000 !important; }
}