/* ==========================================================================
   九幽传媒 · 企业官网设计系统
   深色编辑型版式 / 事实密度优先 / 双客群色彩分流
   规范来源：《九幽传媒 企业官网设计规划方案 V1》第 6 节
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计令牌
   -------------------------------------------------------------------------- */
:root {
  /* ---- 品牌色（取自九幽文化传媒 logo）---- */
  --brand-purple:  #8B2FD6; /* 圆环紫 */
  --brand-violet:  #A855F7; /* 紫（暗底提亮版）*/
  --brand-magenta: #D62E9B; /* 圆环品红 */
  --brand-orange:  #FF9E2C; /* 圆点橙 */
  --brand-amber:   #FFB84D; /* 橙（提亮版）*/
  --brand-coral:   #F2653C; /* 圆环右下珊瑚 */
  --brand-lilac:   #C99BFF; /* 内圈淡紫（提亮版）*/
  --brand-indigo:  #2A2450; /* logo 字色深靛 */

  /* 底色层次：深紫黑，透出下面的品牌渐变 */
  --bg:        #0a0612;
  --bg-2:      #100a1c;
  --bg-3:      #150e26;
  --surface:   rgba(26, 19, 44, 0.72);
  --surface-2: rgba(33, 24, 55, 0.82);

  /* 描边 */
  --border:      rgba(255, 255, 255, 0.08);
  --border-soft: rgba(255, 255, 255, 0.05);
  --border-hi:   rgba(255, 255, 255, 0.20);

  /* 文字 */
  --text:     #f4f1fb;
  --text-2:   #cbc4dd;
  --text-dim: #a9a1c0;
  --text-dim2:#7b7492;

  /* 品牌紫 —— 企业线（AI 数字人 / GEO / 通用强调）*/
  --accent:      #a855f7;
  --accent-2:    #c99bff;
  --accent-soft: rgba(168, 85, 247, 0.15);
  --accent-line: rgba(168, 85, 247, 0.36);

  /* 品牌橙 —— 个人线（直播创业培训 / 报名类 CTA）*/
  --warm:        #ff9e2c;
  --warm-2:      #ffb84d;
  --warm-soft:   rgba(255, 158, 44, 0.15);
  --warm-line:   rgba(255, 158, 44, 0.38);

  /* 品牌渐变主串（紫 → 品红 → 橙）*/
  --brand-gradient: linear-gradient(120deg, #8B2FD6 0%, #D62E9B 55%, #FF9E2C 100%);

  /* 字体族 */
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong,
                "SimSun", Georgia, serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  /* 尺寸 */
  --container: 1200px;
  --container-wide: 1280px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;

  /* 区块垂直节奏 */
  --section-y: 120px;
  --section-y-sm: 72px;

  /* 动效：全站只用 2 条缓动曲线 —— --ease / --ease-soft
     （规划方案第 7 节：禁止超过 2 种缓动曲线） */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-soft: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 300ms;
}

/* --------------------------------------------------------------------------
   2. 重置与基础
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  background: var(--bg);
}

body {
  margin: 0;
  /* 注意：底色必须由 html 承载、body 保持透明，
     否则 body 自身的背景会盖住 body::before 的品牌渐变层 */
  background: transparent;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

/* 品牌渐变底：紫 → 品红 → 橙，取自 logo；固定视口，整站贯穿 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1200px 760px at 6% -12%, rgba(139, 47, 214, 0.30), transparent 60%),
    radial-gradient(1000px 700px at 94% 0%, rgba(214, 46, 155, 0.22), transparent 58%),
    radial-gradient(900px 640px at 78% 42%, rgba(242, 101, 60, 0.10), transparent 62%),
    radial-gradient(1100px 820px at 58% 114%, rgba(255, 158, 44, 0.14), transparent 62%),
    linear-gradient(166deg, #0d0719 0%, #0a0612 42%, #100810 72%, #140b16 100%);
}

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

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--text);
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; }
li { list-style: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

::selection { background: var(--brand-magenta); color: #ffffff; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --------------------------------------------------------------------------
   3. 排版阶梯
   -------------------------------------------------------------------------- */
.h1 {
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.h2 {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.015em;
}
.h3 {
  font-size: clamp(20px, 2.2vw, 24px);
  line-height: 1.35;
  font-weight: 600;
}
.h4 {
  font-size: 18px;
  line-height: 1.4;
  font-weight: 600;
}
.lead {
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.7;
  color: var(--text-2);
}
.body-lg { font-size: 18px; line-height: 1.75; color: var(--text-2); }
.small { font-size: 15px; line-height: 1.65; color: var(--text-dim); }
.tiny { font-size: 13px; line-height: 1.6; color: var(--text-dim); }

/* 编辑感强调词：中文用衬线 + 主色替代斜体 */
.em-warm {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--warm);
  font-weight: 700;
  padding: 0 0.06em;
}
.em-accent {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent-2);
  font-weight: 700;
  padding: 0 0.06em;
}

.dim { color: var(--text-dim); }
.warm { color: var(--warm); }
.accent { color: var(--accent-2); }

/* --------------------------------------------------------------------------
   4. 布局
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container-wide { max-width: var(--container-wide); }

section { position: relative; }
.section { padding: var(--section-y) 0; }
.section-sm { padding: var(--section-y-sm) 0; }
.section-alt { background: rgba(255, 255, 255, 0.024); }

.divider {
  height: 1px;
  background: var(--border);
  border: 0;
  margin: 0;
}

/* --------------------------------------------------------------------------
   5. 编号章节头（等宽字体 / 货架式排布）
   -------------------------------------------------------------------------- */
.sec-head { margin-bottom: 56px; max-width: 780px; }
.sec-head--wide { max-width: 100%; }

/* 标题下划线：进入视口时从 0 展开（参考站 .title-line 同款手法） */
.sec-head .h2 { position: relative; }
.sec-head .h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -16px;
  height: 2px;
  width: 0;
  border-radius: 2px;
  background: var(--brand-gradient);
  transition: width 880ms var(--ease-soft) 140ms;
}
.sec-head.is-in .h2::after { width: 76px; }
.sec-head--warm .h2::after { background: linear-gradient(90deg, var(--warm), var(--brand-coral)); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent-line);
}
.eyebrow--warm::before { background: var(--warm-line); }
.eyebrow__num { color: var(--accent); }
/* 中文字宽≈1em，用 ch 会算窄——标题类宽度统一用 em */
.eyebrow__num::after { content: "/"; margin: 0 8px; opacity: 0.45; }
.eyebrow--warm .eyebrow__num { color: var(--warm); }

.sec-head p { margin-top: 26px; }

.rule-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim2);
}

/* --------------------------------------------------------------------------
   6. 按钮
   -------------------------------------------------------------------------- */
.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: transform 240ms var(--ease), background 240ms var(--ease),
              border-color 240ms var(--ease), color 240ms var(--ease),
              box-shadow 240ms var(--ease);
  white-space: nowrap;
  line-height: 1.2;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
/* 按下：轻微压缩 */
.btn.is-pressed { transform: translateY(0) scale(0.972); }
.btn > * { position: relative; z-index: 1; }

/* 悬停时一道光泽从左扫过（仅实底按钮） */
.btn--warm::after,
.btn--accent::after {
  content: "";
  position: absolute;
  top: -25%; bottom: -25%;
  left: -72%;
  width: 52%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.42), transparent);
  transform: skewX(-18deg);
  transition: left 620ms var(--ease);
  pointer-events: none;
}
.btn--warm:hover::after,
.btn--accent:hover::after { left: 132%; }

/* 点击涟漪 */
.btn-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.42);
  transform: scale(0);
  opacity: 0.9;
  pointer-events: none;
  animation: btnRipple 620ms var(--ease-soft) forwards;
}
.btn--ghost .btn-ripple { background: rgba(168, 85, 247, 0.30); }

.btn--warm { background: var(--warm); color: #2a1400; }
.btn--warm:hover { background: var(--warm-2); box-shadow: 0 14px 32px -10px rgba(255, 158, 44, 0.6); }

.btn--accent { background: var(--accent); color: #14061f; }
.btn--accent:hover { background: var(--accent-2); box-shadow: 0 14px 32px -10px rgba(168, 85, 247, 0.65); }

.btn--ghost {
  background: transparent;
  border-color: var(--border-hi);
  color: var(--text);
}
.btn--ghost:hover {
  border-color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 14px 30px -14px rgba(0, 0, 0, 0.7);
}

.btn--sm { padding: 10px 18px; font-size: 14px; }
.btn--lg { padding: 16px 34px; font-size: 16px; }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

/* 文本箭头链接 */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent-2);
  transition: gap 160ms var(--ease), color 160ms var(--ease);
}
.arrow-link::after { content: "\2192"; transition: transform 160ms var(--ease); }
.arrow-link:hover { gap: 12px; }
.arrow-link--warm { color: var(--warm); }

/* --------------------------------------------------------------------------
   7. 顶部导航
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 7, 22, 0.78);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background 320ms var(--ease), box-shadow 320ms var(--ease),
              border-color 320ms var(--ease);
  animation: dropIn 560ms var(--ease) both;
}
/* 滚动后：底色加深 + 收紧 + 投影，形成"吸附"感 */
.site-header.is-scrolled {
  background: rgba(10, 6, 18, 0.93);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.52);
  border-bottom-color: rgba(255, 255, 255, 0.12);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
  transition: height 320ms var(--ease);
}
.site-header.is-scrolled .nav { height: 58px; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.brand__mark { width: 30px; height: 30px; flex-shrink: 0; }
.brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--text-dim2);
  text-transform: uppercase;
  font-weight: 400;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav__link {
  position: relative;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text-2);
  border-radius: var(--radius-sm);
  transition: color 240ms var(--ease), background 240ms var(--ease);
}
/* 悬停：下划线从左向右展开 */
.nav__link::before {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 3px;
  height: 1.5px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--brand-magenta));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 320ms var(--ease);
}
.nav__link:hover::before { transform: scaleX(1); }
.nav__link:hover { color: var(--text); background: rgba(255,255,255,0.04); }
.nav__link[aria-current="page"] { color: var(--text); }
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* 下拉 */
.nav__item { position: relative; }
.nav__drop-toggle { display: inline-flex; align-items: center; gap: 6px; }
.nav__drop-toggle::after {
  content: "";
  width: 7px; height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 160ms var(--ease);
}
.nav__item:hover .nav__drop-toggle::after,
.nav__item:focus-within .nav__drop-toggle::after { transform: rotate(225deg) translateY(-1px); }

.nav__drop {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 288px;
  padding: 8px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 24px 60px rgba(0,0,0,0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms var(--ease), transform 180ms var(--ease), visibility 180ms;
}
.nav__item:hover .nav__drop,
.nav__item:focus-within .nav__drop {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav__drop-link {
  display: flex;
  gap: 12px;
  padding: 12px 12px;
  border-radius: var(--radius-sm);
  transition: background 140ms var(--ease);
}
.nav__drop-link:hover { background: rgba(255,255,255,0.045); }
.nav__drop-ico {
  width: 30px; height: 30px; flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-2);
}
.nav__drop-title { font-size: 15px; font-weight: 600; color: var(--text); }
.nav__drop-desc { font-size: 12.5px; color: var(--text-dim); line-height: 1.5; }

.nav__cta { margin-left: 10px; flex-shrink: 0; }

/* 汉堡 */
.nav__burger {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  position: relative;
}
.nav__burger span,
.nav__burger span::before,
.nav__burger span::after {
  position: absolute;
  left: 50%; width: 18px; height: 1.5px;
  background: var(--text);
  transform: translateX(-50%);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}
.nav__burger span { top: 50%; margin-top: -0.75px; }
.nav__burger span::before { content: ""; top: -6px; }
.nav__burger span::after { content: ""; top: 6px; }
.nav__burger.is-open span { background: transparent; }
.nav__burger.is-open span::before { transform: translateX(-50%) translateY(6px) rotate(45deg); }
.nav__burger.is-open span::after { transform: translateX(-50%) translateY(-6px) rotate(-45deg); }

/* 移动端抽屉 */
.nav__drawer {
  display: none;
  border-top: 1px solid var(--border);
  background: rgba(16, 10, 28, 0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 16px 0 26px;
}
.nav__drawer.is-open { display: block; }
.nav__drawer-group + .nav__drawer-group { margin-top: 6px; border-top: 1px solid var(--border-soft); padding-top: 6px; }
.nav__drawer-link {
  display: block;
  padding: 12px 24px;
  font-size: 16px;
  color: var(--text-2);
}
.nav__drawer-link:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.nav__drawer-label {
  padding: 14px 24px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim2);
}
.nav__drawer .btn { margin: 16px 24px 0; width: calc(100% - 48px); }

/* --------------------------------------------------------------------------
   8. 事实条 / 数据面板
   -------------------------------------------------------------------------- */
.fact-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
  overflow: hidden;
}
.fact-bar__item {
  flex: 1 1 0;
  min-width: 140px;
  padding: 20px 22px;
  border-right: 1px solid var(--border);
}
.fact-bar__item:last-child { border-right: none; }
.fact-bar__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.fact-bar__num .u { font-size: 13px; color: var(--text-dim); margin-left: 3px; }
.fact-bar__label {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

/* --------------------------------------------------------------------------
   9. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: 104px 0 88px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -240px; right: -180px;
  width: 680px; height: 680px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.20), transparent 66%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -300px; left: -220px;
  width: 620px; height: 620px;
  background: radial-gradient(circle, rgba(255, 158, 44, 0.13), transparent 68%);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 1; }
.hero__title { max-width: 15em; }
.hero__sub {
  margin-top: 26px;
  max-width: 34em;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.7;
  color: var(--text-2);
}
.hero__cta { margin-top: 38px; }
.hero__facts { margin-top: 64px; }

.hero--split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.hero--split .hero__facts { margin-top: 44px; }

/* 业务页首屏变体 */
.page-hero {
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 120% at 88% 0%, var(--hero-glow, rgba(27,181,245,0.12)), transparent 62%);
  pointer-events: none;
}
.page-hero > .container { position: relative; z-index: 1; }

/* 分线描边（暖/青）
   --warm-line / --accent-line 通过 .tone-warm / .tone-cool 切换 */
.tone-warm { --tone: var(--warm); --tone-2: var(--warm-2); --tone-soft: var(--warm-soft); --tone-line: var(--warm-line); --hero-glow: rgba(255, 158, 44, 0.16); }
.tone-cool { --tone: var(--accent); --tone-2: var(--accent-2); --tone-soft: var(--accent-soft); --tone-line: var(--accent-line); --hero-glow: rgba(168, 85, 247, 0.18); }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim2);
  margin-bottom: 22px;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span[aria-hidden] { color: var(--text-dim2); }

/* 每页首屏事实句 */
.factline {
  margin-top: 24px;
  padding: 18px 22px;
  border-left: 2px solid var(--tone, var(--accent));
  background: rgba(255,255,255,0.022);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-2);
  max-width: 46em;
}

/* --------------------------------------------------------------------------
   10. 卡片与网格
   -------------------------------------------------------------------------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 320ms var(--ease), border-color 320ms var(--ease),
              background 320ms var(--ease), box-shadow 320ms var(--ease);
}
.card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hi);
  box-shadow: 0 22px 50px -22px rgba(0, 0, 0, 0.75);
}
.card--link { cursor: pointer; }

/* 悬停时跟随光标的柔光（--mx/--my 由 JS 写入） */
.card::before,
.belief::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 0%),
                              rgba(168, 85, 247, 0.16), transparent 62%);
  opacity: 0;
  transition: opacity 320ms var(--ease);
  pointer-events: none;
  z-index: 0;
}
.card--warm::before {
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 0%),
                              rgba(255, 158, 44, 0.19), transparent 62%);
}
.card:hover::before,
.belief:hover::before { opacity: 1; }

/* 价格卡的暖色高亮层：只有鼠标悬停的那一张才亮。
   径向柔光跟随光标 + 顶部暖色渐变放在同一层，用 opacity 过渡，
   避免 background 渐变之间无法插值导致的「跳变」。 */
.price-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(340px circle at var(--mx, 50%) var(--my, 0%),
                    rgba(255, 158, 44, 0.24), transparent 62%),
    linear-gradient(180deg, rgba(255, 158, 44, 0.13), transparent 56%);
  opacity: 0;
  transition: opacity 320ms var(--ease);
  pointer-events: none;
  z-index: 0;
}
.price-card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }

.card--warm { border-color: var(--warm-line); }
.card--warm:hover { border-color: var(--warm); background: linear-gradient(180deg, var(--warm-soft), var(--surface) 60%); }
.card--cool { border-color: var(--accent-line); }
.card--cool:hover { border-color: var(--accent); background: linear-gradient(180deg, var(--accent-soft), var(--surface) 60%); }

.card__ico {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  margin-bottom: 20px;
  color: var(--text);
}
.card--warm .card__ico { color: var(--warm); border-color: var(--warm-line); background: var(--warm-soft); }
.card--cool .card__ico { color: var(--accent-2); border-color: var(--accent-line); background: var(--accent-soft); }

.card__title { font-size: 20px; font-weight: 700; }
.card__desc { margin-top: 12px; color: var(--text-dim); font-size: 15.5px; line-height: 1.7; }
.card__body { margin-top: 18px; }
.card__foot { margin-top: auto; padding-top: 22px; }

.card__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim2);
  margin-bottom: 10px;
}

/* 交付清单 */
.dlist { display: flex; flex-direction: column; gap: 0; }
.dlist li {
  display: flex;
  gap: 10px;
  padding: 9px 0;
  font-size: 14.5px;
  color: var(--text-2);
  border-bottom: 1px solid var(--border-soft);
  line-height: 1.6;
}
.dlist li:last-child { border-bottom: none; }
.dlist li::before {
  content: "";
  flex-shrink: 0;
  width: 5px; height: 5px;
  margin-top: 9px;
  border-radius: 50%;
  background: var(--tone, var(--accent));
}
.dlist--warm li::before { background: var(--warm); }
.dlist--cool li::before { background: var(--accent); }

/* 三栏编号速览 */
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
}
.three-col__item {
  padding: 34px 30px 34px 0;
  border-right: 1px solid var(--border);
}
.three-col__item:last-child { border-right: none; padding-right: 0; }
.three-col__item:not(:first-child) { padding-left: 30px; }
.three-col__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  display: block;
  margin-bottom: 16px;
}
.warm-scope .three-col__num { color: var(--warm); }
.three-col__title { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.three-col__text { font-size: 15px; color: var(--text-dim); line-height: 1.75; }

/* --------------------------------------------------------------------------
   11. 流程时间轴
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-top: 8px;
}
.timeline__line {
  position: absolute;
  top: 7px; left: 0; right: 0;
  height: 1px;
  background: var(--border);
}
.timeline__line-fill {
  position: absolute;
  top: 7px; left: 0;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--warm));
  transition: width 1200ms var(--ease);
}
.timeline.is-in .timeline__line-fill { width: 100%; }

.timeline__step { position: relative; padding-right: 20px; }
.timeline__dot {
  position: relative;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  margin-bottom: 22px;
  z-index: 1;
  transform: scale(0);
  transition: transform 460ms var(--ease-soft);
}
.timeline.is-in .timeline__dot { transform: scale(1); }
.timeline__step:nth-child(5) .timeline__dot { border-color: var(--warm); }
.timeline__day {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent-2);
  margin-bottom: 8px;
}
.timeline__title { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.timeline__text { font-size: 14px; color: var(--text-dim); line-height: 1.7; }

/* 纵向变体 */
.timeline--v { grid-template-columns: 1fr; gap: 0; }
.timeline--v .timeline__line,
.timeline--v .timeline__line-fill { display: none; }
.timeline--v .timeline__step {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-top: 1px solid var(--border);
}
.timeline--v .timeline__dot { display: none; }
.timeline--v .timeline__head { white-space: nowrap; }

/* 步骤轴（GEO 五步法） */
.steps { counter-reset: step; }
.steps__item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 26px 0;
  border-top: 1px solid var(--border);
  align-items: start;
}
.steps__item:last-child { border-bottom: 1px solid var(--border); }
.steps__num {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--tone, var(--accent));
  font-weight: 500;
  line-height: 1.3;
}
.steps__title { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.steps__text { font-size: 15px; color: var(--text-dim); line-height: 1.75; }

/* --------------------------------------------------------------------------
   12. 价格卡
   -------------------------------------------------------------------------- */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }

.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 320ms var(--ease), border-color 320ms var(--ease),
              box-shadow 320ms var(--ease);
}
.price-card:hover {
  transform: translateY(-5px);
  border-color: var(--warm);
  box-shadow: 0 22px 50px -22px rgba(0, 0, 0, 0.75),
              0 0 34px -14px rgba(255, 158, 44, 0.5);
}
.price-card > * { position: relative; z-index: 1; }
/* 主推档（Tier 02）不再常驻暖色描边与底色——
   三张卡片的高亮统一由 :hover 触发，主推身份只通过暖色实心按钮体现。
   .price-card--feature 类仍由 build.py 输出，便于后续单独调整主推档。 */

.price-card__tier {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim2);
}
.price-card__name { font-size: 21px; font-weight: 700; margin-top: 12px; }
.price-card__price {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
}
.price-card__price .cur { font-size: 20px; color: var(--text-dim); margin-right: 2px; }
.price-card__price .u { font-size: 14px; color: var(--text-dim); margin-left: 4px; }
.price-card__for {
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.65;
}
.price-card__list { margin-top: 20px; flex: 1; }
.price-card__foot { margin-top: 26px; }
.price-card__foot .btn { width: 100%; }

/* 悬停卡片时，「预约到访」按钮跟着变成暖色实底——
   与卡片高亮同源，三档按钮行为完全一致；
   :focus-within 让键盘 Tab 聚焦按钮时也触发同样的高亮 */
.price-card:hover .btn--ghost,
.price-card:focus-within .btn--ghost {
  background: var(--warm);
  border-color: var(--warm);
  color: #2a1400;
  box-shadow: 0 14px 32px -10px rgba(255, 158, 44, 0.6);
}
/* 按钮底变暖后，点击涟漪也从紫转白，避免紫点落在黄底上 */
.price-card:hover .btn--ghost .btn-ripple,
.price-card:focus-within .btn--ghost .btn-ripple { background: rgba(255, 255, 255, 0.45); }

.price-card--alt { opacity: 0.72; }
.price-card--alt .price-card__name { color: var(--text-2); }

/* 表格 */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.data {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 15px;
}
table.data th, table.data td {
  text-align: left;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.65;
}
table.data thead th {
  background: rgba(21, 14, 38, 0.88);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  font-weight: 500;
  white-space: nowrap;
}
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: rgba(255,255,255,0.018); }
table.data td strong { color: var(--text); }

/* --------------------------------------------------------------------------
   13. 可核验清单 / 对比块
   -------------------------------------------------------------------------- */
.verify {
  border: 1px solid var(--border-hi);
  border-radius: var(--radius);
  background: rgba(21, 14, 38, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 30px;
}
.verify__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 8px;
}
.verify__lead { font-size: 17px; font-weight: 600; margin-bottom: 22px; }
.verify__group { padding: 16px 0; border-top: 1px solid var(--border); }
.verify__group-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 600; margin-bottom: 10px;
}
.verify__group-title .tag {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.verify__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 4px;
}
.verify__list li::before {
  content: "";
  position: absolute; left: 0; top: 10px;
  width: 9px; height: 1px;
  background: var(--warm);
}

/* --------------------------------------------------------------------------
   14. 引言 / 三句话
   -------------------------------------------------------------------------- */
.quote {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.quote__text {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.5;
  color: var(--text);
  font-weight: 600;
  max-width: 24em;
}
.quote__by {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-dim);
}
.quote__by::before {
  content: "";
  width: 28px; height: 1px;
  background: var(--accent);
}

.beliefs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.belief {
  position: relative;
  padding: 30px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 320ms var(--ease), border-color 320ms var(--ease),
              box-shadow 320ms var(--ease);
}
.belief:hover {
  transform: translateY(-5px);
  border-color: var(--border-hi);
  box-shadow: 0 22px 50px -22px rgba(0, 0, 0, 0.75);
}
.belief > * { position: relative; z-index: 1; }
.belief__quote {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 16px;
}
.belief__quote::before { content: "\300C"; color: var(--accent); margin-right: 2px; }
.belief__quote::after { content: "\300D"; color: var(--accent); margin-left: 2px; }
.belief__text { font-size: 15px; color: var(--text-dim); line-height: 1.75; }

/* --------------------------------------------------------------------------
   15. FAQ 手风琴
   -------------------------------------------------------------------------- */
.faq { border-top: 1px solid var(--border); }
.faq__item { border-bottom: 1px solid var(--border); }
.faq__q {
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 24px 0;
  text-align: left;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.6;
}
.faq__q:hover { color: var(--accent-2); }
.faq__q .qnum {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim2);
  padding-top: 6px;
  flex-shrink: 0;
}
.faq__q .qtext { flex: 1; }
.faq__sign {
  flex-shrink: 0;
  width: 22px; height: 22px;
  position: relative;
  margin-top: 5px;
  transition: transform 200ms var(--ease);
}
.faq__sign::before, .faq__sign::after {
  content: "";
  position: absolute;
  background: var(--text-dim);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}
.faq__sign::before { top: 50%; left: 0; right: 0; height: 1.5px; margin-top: -0.75px; }
.faq__sign::after { left: 50%; top: 0; bottom: 0; width: 1.5px; margin-left: -0.75px; }
.faq__item.is-open .faq__sign { transform: rotate(90deg); }
.faq__item.is-open .faq__sign::after { opacity: 0; }

.faq__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 200ms var(--ease);
}
.faq__a-inner {
  padding: 0 40px 28px 42px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-dim);
}
.faq__a-inner p { margin-bottom: 0.9em; }
.faq__a-inner strong { color: var(--text-2); font-weight: 600; }
.faq__a-inner ul { margin: 10px 0; }
.faq__a-inner ul li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 5px;
}
.faq__a-inner ul li::before {
  content: "";
  position: absolute; left: 0; top: 11px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.faq__group-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 40px 0 4px;
  border-bottom: 1px solid var(--border);
  margin-top: 8px;
}
.faq__group:first-child .faq__group-title { padding-top: 0; }

/* --------------------------------------------------------------------------
   16. 事实清单（数字与事实）
   -------------------------------------------------------------------------- */
.facts-block { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px 40px; }
.facts-block__item { padding-top: 18px; border-top: 1px solid var(--border); }
.facts-block__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim2);
  margin-bottom: 8px;
}
.facts-block__value { font-size: 16px; color: var(--text); line-height: 1.7; }
.facts-block__value b { font-family: var(--font-mono); font-weight: 500; }

/* 实体信息卡 */
.entity-card {
  background: rgba(21, 14, 38, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
}
.entity-card__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}
.entity-card dl { margin: 0; display: grid; gap: 0; }
.entity-card .row {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-soft);
  font-size: 14.5px;
}
.entity-card .row:last-child { border-bottom: none; }
.entity-card dt { color: var(--text-dim2); }
.entity-card dd { margin: 0; color: var(--text-2); }
.entity-card dd.mono { font-family: var(--font-mono); font-size: 13.5px; letter-spacing: 0.02em; }

/* --------------------------------------------------------------------------
   17. 合规 / 红线条目
   -------------------------------------------------------------------------- */
.redline { display: grid; gap: 0; border-top: 1px solid var(--border); }
.redline__item {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 22px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.redline__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim2);
  padding-top: 3px;
}
.redline__title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.redline__text { font-size: 15px; color: var(--text-dim); line-height: 1.75; }

/* 承诺与不承诺 */
.promise { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.promise__box { padding: 26px 28px; border-radius: var(--radius); border: 1px solid var(--border); }
.promise__box--yes { background: rgba(168,85,247,0.07); border-color: var(--accent-line); }
.promise__box--no { background: rgba(255,255,255,0.015); }
.promise__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.promise__box--yes .promise__title { color: var(--accent); }
.promise__box--no .promise__title { color: var(--text-dim2); }

/* 提示条 */
.notice {
  display: flex;
  gap: 14px;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.018);
  font-size: 14.5px;
  color: var(--text-dim);
  line-height: 1.7;
}
.notice__ico { flex-shrink: 0; color: var(--text-dim2); margin-top: 2px; }
.notice--cool { border-color: var(--accent-line); background: rgba(168,85,247,0.06); }
.notice--warm { border-color: var(--warm-line); background: rgba(255,158,44,0.06); }

/* --------------------------------------------------------------------------
   18. CTA 收尾
   -------------------------------------------------------------------------- */
.cta-band {
  padding: 96px 0;
  border-top: 1px solid var(--border);
  background:
    radial-gradient(ellipse 62% 130% at 50% 0%, rgba(168, 85, 247, 0.20), transparent 62%),
    radial-gradient(ellipse 54% 110% at 82% 100%, rgba(255, 158, 44, 0.10), transparent 60%),
    rgba(255, 255, 255, 0.018);
  text-align: center;
}
.cta-band__title { font-size: clamp(32px, 5vw, 56px); font-weight: 900; letter-spacing: -0.02em; line-height: 1.1; }
.cta-band__sub { margin: 22px auto 0; max-width: 30em; color: var(--text-dim); font-size: 17px; }
.cta-band .btn-row { justify-content: center; margin-top: 36px; }

/* --------------------------------------------------------------------------
   19. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: 72px 0 40px;
}
.footer__top { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; }
.footer__brand { display: flex; flex-direction: column; gap: 18px; }
.footer__desc { font-size: 14.5px; color: var(--text-dim); line-height: 1.8; max-width: 46ch; }
.footer__nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer__col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim2);
  margin-bottom: 14px;
}
.footer__col a {
  display: block;
  padding: 5px 0;
  font-size: 14.5px;
  color: var(--text-2);
}
.footer__col a:hover { color: var(--accent-2); }

.footer__entity { margin-top: 56px; }
.footer__bottom {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim2);
}
.footer__bottom a { color: var(--text-dim2); }
.footer__bottom a:hover { color: var(--text-dim); }
.footer__disclaimer {
  margin-top: 20px;
  font-size: 12.5px;
  color: var(--text-dim2);
  line-height: 1.7;
  max-width: 90ch;
}

/* --------------------------------------------------------------------------
   20. 进场动效 · 滚动动效 · 点击反馈
   参考 xafa.edu.cn 的手法：滚动进视口加类 → 位移+淡入；标题线从 0 展开；
   悬停位移；加载时头部下沉。
   边界（规划方案第 7 节）：不用视差滚动、不用自动轮播、不做循环闪烁光效，
   缓动曲线全站只用 --ease / --ease-soft 两条。
   -------------------------------------------------------------------------- */

/* 关键帧 —— 仅用 2 条曲线 */
@keyframes riseIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: none; }
}
@keyframes dropIn {
  from { opacity: 0; transform: translateY(-14px); }
  to   { opacity: 1; transform: none; }
}
@keyframes btnRipple {
  to { transform: scale(2.5); opacity: 0; }
}

/* 滚动进视口揭示
   注意：用独立的 translate / scale 属性，不要用 transform ——
   .card:hover 等悬停效果用的是 transform，两者特异性相同会互相覆盖，
   分开写才能让"已揭示 + 正在悬停"同时生效。 */
.reveal {
  opacity: 0;
  translate: 0 22px;
  transition: opacity 520ms var(--ease), translate 520ms var(--ease);
  will-change: opacity, translate;
}
.reveal--left  { translate: -26px 0; }
.reveal--right { translate: 26px 0; }
.reveal--zoom  { translate: 0 10px; scale: 0.955; transition: opacity 520ms var(--ease), translate 520ms var(--ease), scale 520ms var(--ease); }
.reveal.is-in  { opacity: 1; translate: none; scale: none; }

/* 首屏加载入场：头部下沉、Hero 逐行上浮 */
.hero__inner > * { animation: riseIn 760ms var(--ease) both; }
.hero__inner > *:nth-child(1) { animation-delay: 60ms; }
.hero__inner > *:nth-child(2) { animation-delay: 150ms; }
.hero__inner > *:nth-child(3) { animation-delay: 240ms; }
.hero__inner > *:nth-child(4) { animation-delay: 320ms; }
.hero__inner > *:nth-child(5) { animation-delay: 400ms; }

.page-hero > .container > * { animation: riseIn 720ms var(--ease) both; }
.page-hero > .container > *:nth-child(1) { animation-delay: 60ms; }
.page-hero > .container > *:nth-child(2) { animation-delay: 140ms; }
.page-hero > .container > *:nth-child(3) { animation-delay: 220ms; }
.page-hero > .container > *:nth-child(4) { animation-delay: 300ms; }
.page-hero > .container > *:nth-child(5) { animation-delay: 380ms; }
.page-hero > .container > *:nth-child(6) { animation-delay: 440ms; }

/* 阅读进度条（顶部品牌渐变细线） */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 200;
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--brand-gradient);
  box-shadow: 0 0 12px rgba(214, 46, 155, 0.55);
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-hi);
  background: rgba(21, 14, 38, 0.86);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(0.9);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease),
              visibility 320ms, color 240ms var(--ease), border-color 240ms var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--accent-2); border-color: var(--accent-line); transform: translateY(-3px); }
.to-top.is-pressed { transform: scale(0.94); }

/* 无障碍：整体动效降级 */
@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;
  }
  .reveal { opacity: 1; translate: none; scale: none; }
  .timeline__line-fill { width: 100% !important; }
  .timeline__dot { transform: scale(1) !important; }
  .sec-head .h2::after { width: 76px !important; }
  .card::before, .price-card::before, .belief::before { display: none; }
  .btn::after { display: none; }
}

/* --------------------------------------------------------------------------
   21. 工具类
   -------------------------------------------------------------------------- */
.mt-0 { margin-top: 0; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mt-56 { margin-top: 56px; }
.mt-64 { margin-top: 64px; }
.mb-0 { margin-bottom: 0; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-40 { margin-bottom: 40px; }
.mb-56 { margin-bottom: 56px; }
.center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.maxw-60 { max-width: 34em; }
.maxw-72 { max-width: 40em; }
.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;
}
.stack-lg > * + * { margin-top: 32px; }

/* --------------------------------------------------------------------------
   22. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  :root { --section-y: 92px; --section-y-sm: 64px; }
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__burger { display: block; margin-left: auto; }
  .hero--split { grid-template-columns: 1fr; gap: 40px; }
  .footer__top { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 860px) {
  .grid-3, .grid-4, .price-grid, .beliefs, .promise, .facts-block { grid-template-columns: 1fr 1fr; }
  .three-col { grid-template-columns: 1fr; }
  .three-col__item { border-right: none; border-bottom: 1px solid var(--border); padding: 26px 0; }
  .three-col__item:not(:first-child) { padding-left: 0; }
  .three-col__item:last-child { border-bottom: none; }
  .timeline { grid-template-columns: 1fr; gap: 0; }
  .timeline__line, .timeline__line-fill { display: none; }
  .timeline__step {
    display: grid; grid-template-columns: 110px 1fr; gap: 20px;
    padding: 22px 0; border-top: 1px solid var(--border); padding-right: 0;
  }
  .timeline__dot { display: none; }
  .timeline__head { white-space: nowrap; }
  .timeline__body { padding-top: 2px; }
}

@media (max-width: 620px) {
  :root { --section-y: 72px; --section-y-sm: 56px; }
  body { font-size: 16px; }
  .container { padding: 0 20px; }
  .grid-2, .grid-3, .grid-4, .price-grid, .beliefs, .promise, .facts-block { grid-template-columns: 1fr; }
  .card { padding: 24px 22px; }
  .fact-bar__item { flex: 1 1 50%; border-bottom: 1px solid var(--border); }
  .footer__nav { grid-template-columns: 1fr 1fr; }
  .timeline__step { grid-template-columns: 1fr; gap: 6px; }
  .timeline__head { white-space: normal; }
  .entity-card .row { grid-template-columns: 1fr; gap: 2px; }
  .steps__item { grid-template-columns: 44px 1fr; gap: 16px; }
  .redline__item { grid-template-columns: 34px 1fr; gap: 14px; }
  .faq__a-inner { padding-left: 0; padding-right: 0; }
  .cta-band { padding: 72px 0; }
  .to-top { right: 16px; bottom: 16px; width: 42px; height: 42px; }
  /* 移动端收窄入场位移，避免与滚动方向冲突 */
  .reveal { translate: 0 16px; }
  .reveal--left, .reveal--right { translate: 0 16px; }
}