/* =============================================================
   曼塔 AI 官网 · 设计系统
   气质：Hermes Agent 风格 —— 浅蓝白桌面应用、Hermes 蓝、
   轻雾背景、衬线大标题、金色价格强调、绿色完成状态。
   ============================================================= */

/* ---------- 设计变量 ---------- */
:root {
  /* 品牌靛蓝 / 曼塔吉祥物同色系（periwinkle indigo） */
  --blue-700: #2f30a6;
  --blue-600: #4b50e6;   /* 主色 · 与吉祥物轮廓同调 */
  --blue-500: #6e73ef;   /* periwinkle，贴近 logo 描边 */
  --blue-200: #c4c6f6;
  --blue-100: #e6e7fc;
  --blue-050: #f1f2fe;

  /* 中性 / 油墨 */
  --ink-900: #0c1530;    /* 标题深海军 */
  --ink-700: #2a3354;
  --ink-500: #5a637c;    /* 正文 */
  --ink-400: #818aa3;
  --ink-300: #aab2c6;
  --line: #e4e9f5;
  --line-soft: #eef1f9;

  /* 背景 */
  --bg: #f5f8ff;
  --bg-fog: #eaf0ff;
  --surface: #ffffff;
  --surface-2: #f8faff;

  /* 强调色 */
  --gold-600: #b07d1e;
  --gold-500: #d8a13a;
  --gold-100: #fbf2dc;
  --green-600: #168a4c;
  --green-500: #1faa59;
  --green-100: #e2f6ea;

  /* 字体 */
  --font-display: "Fraunces", "Noto Serif SC", Georgia, serif;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* 半径 / 阴影 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;
  --shadow-xs: 0 1px 2px rgba(16, 30, 80, 0.06);
  --shadow-sm: 0 4px 16px rgba(20, 40, 120, 0.06);
  --shadow-md: 0 18px 44px rgba(20, 40, 120, 0.10);
  --shadow-lg: 0 36px 80px rgba(18, 38, 110, 0.16);
  --shadow-blue: 0 18px 40px rgba(75, 80, 230, 0.28);

  --maxw: 1200px;
  --nav-h: 68px;
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink-700);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink-900);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p { margin: 0; }

/* ---------- 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 104px 0; position: relative; }
.section--tight { padding: 72px 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-600);
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--blue-050);
  border: 1px solid var(--blue-100);
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue-600);
  box-shadow: 0 0 0 4px rgba(75, 80, 230, 0.16);
}

.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  margin-top: 20px;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.section-sub {
  margin-top: 18px;
  font-size: 17px;
  color: var(--ink-500);
  line-height: 1.75;
}

.text-blue { color: var(--blue-600); }
.text-gold { color: var(--gold-600); }
.text-green { color: var(--green-600); }
.nowrap { white-space: nowrap; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 600;
  padding: 14px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
  color: #fff;
  box-shadow: var(--shadow-blue);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 24px 50px rgba(75, 80, 230, 0.36); }

.btn-ghost {
  background: var(--surface);
  color: var(--ink-900);
  border-color: var(--line);
  box-shadow: var(--shadow-xs);
}
.btn-ghost:hover { border-color: var(--blue-200); transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.btn-gold {
  background: linear-gradient(135deg, #e7b44e, var(--gold-500));
  color: #4a360c;
  box-shadow: 0 16px 36px rgba(216, 161, 58, 0.34);
}
.btn-gold:hover { transform: translateY(-2px); }

.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-block { width: 100%; }

.arrow { transition: transform 0.2s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* =============================================================
   导航
   ============================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(245, 248, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.nav.scrolled {
  border-bottom-color: var(--line);
  background: rgba(245, 248, 255, 0.9);
  box-shadow: var(--shadow-xs);
}
.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}
.brand__mark {
  width: 42px; height: 42px;
  display: grid;
  place-items: center;
  position: relative;
  flex: 0 0 auto;
}
.brand__mark img {
  width: 100%; height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 4px 9px rgba(75, 80, 230, 0.28));
}
.brand__text { display: flex; flex-direction: column; line-height: 1; }
.brand__name { font-size: 17px; font-weight: 700; color: var(--ink-900); letter-spacing: 0.01em; }
.brand__sub {
  font-size: 9.5px;
  color: var(--ink-400);
  font-weight: 600;
  letter-spacing: 0.3em;
  margin-top: 4px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: 18px;
}
.nav__links a {
  font-size: 15px;
  color: var(--ink-700);
  font-weight: 500;
  position: relative;
  transition: color 0.2s ease;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  border-radius: 2px;
  background: var(--blue-600);
  transition: width 0.25s ease;
}
.nav__links a:hover { color: var(--blue-600); }
.nav__links a:hover::after { width: 100%; }

.nav__right { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.nav__console {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-500);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav__console:hover { color: var(--blue-600); }

.nav__toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
}
.nav__toggle span {
  width: 18px; height: 2px; border-radius: 2px;
  background: var(--ink-900);
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav.open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================================
   背景氛围
   ============================================================= */
.fog {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}
.fog span {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
}
.fog .f1 { width: 520px; height: 520px; background: #cdd9ff; top: -160px; left: -120px; }
.fog .f2 { width: 460px; height: 460px; background: #dfe7ff; top: 40px; right: -160px; opacity: 0.7; }
.fog .f3 { width: 380px; height: 380px; background: #e7eeff; bottom: -120px; left: 30%; }

/* =============================================================
   Hero
   ============================================================= */
.hero {
  position: relative;
  padding: 56px 0 96px;
  background:
    radial-gradient(1100px 520px at 75% -10%, #ffffff 0%, rgba(255,255,255,0) 60%),
    linear-gradient(180deg, var(--bg-fog) 0%, var(--bg) 60%);
}
.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 1.1fr;
  gap: 56px;
  align-items: center;
}
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(38px, 5.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-top: 22px;
}
.hero__title em {
  font-style: normal;
  color: var(--blue-600);
  position: relative;
}
.hero__title em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 4px;
  height: 12px;
  background: linear-gradient(90deg, rgba(75, 80, 230,0.16), rgba(75, 80, 230,0.04));
  z-index: -1;
  border-radius: 4px;
}
.hero__sub {
  margin-top: 24px;
  font-size: 18px;
  color: var(--ink-500);
  max-width: 540px;
  line-height: 1.8;
}
.hero__cta { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px; }

.price-chips {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.chip {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-xs);
  font-size: 14px;
  color: var(--ink-500);
}
.chip b { font-family: var(--font-display); font-size: 20px; color: var(--ink-900); font-weight: 600; }
.chip .unit { font-size: 13px; }
.chip--gold { background: var(--gold-100); border-color: #f0e0b5; }
.chip--gold b { color: var(--gold-600); }

.hero__trust {
  margin-top: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.avatars { display: flex; align-items: center; flex: 0 0 auto; }
.avatars .ava {
  flex: 0 0 auto;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 2.5px solid #fff;
  margin-left: -12px;
  object-fit: cover;
  background: var(--blue-100);
  box-shadow: var(--shadow-sm);
}
.avatars .ava:first-child { margin-left: 0; }
.avatars .more {
  flex: 0 0 auto;
  width: 38px; height: 38px;
  border-radius: 50%;
  margin-left: -12px;
  border: 2.5px solid #fff;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  color: #fff;
  display: grid; place-items: center;
  font-size: 11px; font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.trust-text { font-size: 13.5px; color: var(--ink-500); line-height: 1.45; }
.trust-text b { display: block; color: var(--ink-900); font-size: 14px; margin-bottom: 1px; }
.trust-text em { font-style: normal; color: var(--blue-700); font-weight: 600; }

/* =============================================================
   课程主理人
   ============================================================= */
.founders__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.founder {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 26px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.founder:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.founder__ava {
  flex: 0 0 auto;
  width: 62px; height: 62px;
  border-radius: 16px;
  overflow: hidden;
  background: var(--blue-050);
  box-shadow: 0 8px 18px rgba(75, 80, 230, 0.28);
  border: 2px solid #fff;
}
.founder__ava img { width: 100%; height: 100%; object-fit: cover; display: block; }
.founder__ava--gold {
  box-shadow: 0 8px 18px rgba(176, 125, 30, 0.28);
  background: var(--gold-100);
}
.founder__name {
  font-family: var(--font-display);
  font-size: 20px; font-weight: 600; color: var(--ink-900);
  line-height: 1.2;
}
.founder__title {
  margin-top: 6px;
  font-size: 15px; font-weight: 600; color: var(--blue-700);
}
.founder__title b { color: var(--ink-900); }
.founder__ava--gold + .founder__body .founder__title { color: var(--gold-600); }
.founder__desc {
  margin-top: 10px;
  font-size: 14px; color: var(--ink-500); line-height: 1.7;
}

/* Hero 视觉窗口 */
.hero__visual { position: relative; }
.window {
  border-radius: var(--r-xl);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.window__bar {
  height: 42px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line-soft);
}
.window__bar i { width: 11px; height: 11px; border-radius: 50%; background: #e0e4ef; }
.window__bar i:nth-child(1) { background: #ff5f57; }
.window__bar i:nth-child(2) { background: #febc2e; }
.window__bar i:nth-child(3) { background: #28c840; }
.window img { width: 100%; display: block; }

.float-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-900);
}
.float-card small { display: block; font-size: 12px; color: var(--ink-400); font-weight: 500; }
.float-card .dot {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  font-size: 16px;
}
.float-card--done {
  bottom: -26px; left: -34px;
  animation: floaty 5s ease-in-out infinite;
}
.float-card--done .dot { background: var(--green-100); color: var(--green-600); }
.float-card--wechat {
  top: -18px; right: -20px;
  animation: floaty 6s ease-in-out infinite 0.6s;
}
.float-card--wechat .dot { background: var(--blue-050); color: var(--blue-600); }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* =============================================================
   Agent Logo 条（hero 与信任条之间）
   ============================================================= */
.agents-strip {
  padding: 28px 0 32px;
  background: #fff;
}
.agents-strip__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 42px;
  flex-wrap: wrap;
}
.agents-strip__lead {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--ink-500);
  margin: 0;
  white-space: nowrap;
}
.agents-strip__lead::after {
  content: "";
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--line);
  vertical-align: middle;
  margin-left: 14px;
}
.agents-strip__row {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 42px;
  flex-wrap: wrap;
  justify-content: center;
}
.agents-strip__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
}
.agents-strip__logo {
  height: 30px;
  width: auto;
  display: block;
}
.agents-strip__logo--wordmark {
  height: 22px;
}

/* =============================================================
   信任条
   ============================================================= */
.trust {
  background: var(--surface);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.trust__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  padding: 44px 0;
}
.trust__item { text-align: center; }
.trust__num {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 600;
  color: var(--blue-600);
  line-height: 1;
}
.trust__label { margin-top: 10px; font-size: 14px; color: var(--ink-500); }
.trust__item + .trust__item { border-left: 1px solid var(--line-soft); }

/* =============================================================
   线下课已跑通 · 社会认同
   ============================================================= */
.proof { background: var(--bg); }
.proof__grid {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: 34px;
  align-items: stretch;
}
.proof__photos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: repeat(2, 200px);
  gap: 14px;
}
.proof__photo {
  margin: 0;
  min-height: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-900);
  box-shadow: var(--shadow-sm);
}
.proof__photo img { width: 100%; height: 100%; object-fit: cover; }
.proof__photo--tall { grid-row: 1 / span 2; grid-column: 1; }
.proof__side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.proof__quote {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.5;
  color: var(--ink-900);
  background: var(--blue-050);
  border: 1px solid var(--blue-100);
  border-left: 4px solid var(--blue-600);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: 22px 24px;
}
.proof__lead { display: block; font-size: 14px; font-weight: 700; color: var(--ink-900); margin-bottom: 10px; }
.persona-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.persona-tags span {
  font-size: 13px; font-weight: 600;
  color: var(--blue-700);
  background: var(--blue-050);
  border: 1px solid var(--blue-100);
  padding: 6px 12px;
  border-radius: 999px;
}
.proof__stat { font-size: 15px; color: var(--ink-500); }
.proof__stat b { color: var(--blue-600); font-family: var(--font-display); font-size: 22px; margin-right: 4px; }
.proof__side .btn { align-self: flex-start; margin-top: auto; }

/* =============================================================
   下载曼塔 Agent（桌面客户端）
   ============================================================= */
.download { background: var(--surface); border-top: 1px solid var(--line-soft); }
.download__inner { max-width: 760px; margin: 0 auto; text-align: center; }
.download__inner .section-title { margin-top: 18px; }
.download__btns {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 30px;
}
.download__btns .btn { min-width: 210px; }
.dl-ico { display: inline-flex; align-items: center; }
.dl-ico svg { width: 18px; height: 18px; display: block; }
.download__note { margin-top: 16px; font-size: 13px; color: var(--ink-400); }
.download__note a { color: var(--blue-600); text-decoration: none; border-bottom: 1px solid currentColor; padding-bottom: 1px; }
.download__note a:hover { opacity: .8; }

/* =============================================================
   精选技能
   ============================================================= */
.skills-showcase {
  background:
    radial-gradient(780px 360px at 12% 8%, rgba(255,255,255,0.92), rgba(255,255,255,0)),
    radial-gradient(640px 320px at 88% 0%, rgba(226,233,255,0.72), rgba(226,233,255,0)),
    linear-gradient(180deg, #f7faff 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}
.skills-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 42px;
  align-items: end;
  margin-bottom: 34px;
}
.skills-head .section-head { margin-bottom: 0; }
.skills-meter {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: center;
  background: rgba(255,255,255,0.82);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
a.skills-meter:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue-200);
}
.skills-meter__go {
  color: var(--blue-600);
  font-weight: 600;
  font-size: 12.5px;
  margin-left: 4px;
  white-space: nowrap;
}
a.skills-meter:hover .skills-meter__go { text-decoration: underline; }
.skills-meter::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -46px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(75, 80, 230,0.18), rgba(75, 80, 230,0));
}
.skills-meter__num {
  font-family: var(--font-display);
  font-size: 44px;
  line-height: 1;
  font-weight: 600;
  color: var(--blue-600);
}
.skills-meter b {
  display: block;
  color: var(--ink-900);
  font-size: 15px;
  margin-bottom: 4px;
}
.skills-meter span {
  display: block;
  color: var(--ink-500);
  font-size: 12.5px;
  line-height: 1.65;
}

.skill-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.skill-cat {
  position: relative;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 18px;
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.skill-cat::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-500), rgba(75, 80, 230,0.08));
}
.skill-cat:hover {
  transform: translateY(-4px);
  border-color: var(--blue-100);
  box-shadow: var(--shadow-md);
}
.skill-cat__top {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  margin-bottom: 16px;
}
.skill-cat__ico {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--blue-700);
  background: var(--blue-050);
  border: 1px solid var(--blue-100);
}
.skill-cat__ico--green { color: var(--green-600); background: var(--green-100); border-color: #c8ecd5; }
.skill-cat__ico--red { color: #d7333f; background: #fff0f2; border-color: #ffd5db; font-family: var(--font-sans); font-size: 17px; }
.skill-cat__ico--gold { color: var(--gold-600); background: var(--gold-100); border-color: #f0e0b5; }
.skill-cat__ico--violet { color: #6d3dd8; background: #ede9fe; border-color: #ddd6fe; }
.skill-cat__ico--cyan { color: #0f7892; background: #e2f7fb; border-color: #bdebf4; }
.skill-cat h3 {
  font-size: 18px;
  margin: 1px 0 5px;
  color: var(--ink-900);
}
.skill-cat p {
  font-size: 13px;
  color: var(--ink-500);
  line-height: 1.55;
}
.skill-list {
  display: grid;
  gap: 9px;
}
.skill-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 62px;
  padding: 11px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: linear-gradient(180deg, #fff, var(--surface-2));
}
.skill-item__ico {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--blue-050);
  color: var(--blue-600);
  font-size: 16px;
  overflow: hidden;
}
.skill-item__ico img {
  width: 22px;
  height: 22px;
  object-fit: contain;
  display: block;
}
.skill-item b {
  display: block;
  color: var(--ink-900);
  font-size: 13.5px;
  line-height: 1.35;
}
.skill-item small {
  display: block;
  margin-top: 3px;
  color: var(--ink-500);
  font-size: 11.5px;
  line-height: 1.45;
}
.skill-item em {
  align-self: start;
  font-style: normal;
  font-size: 10.5px;
  font-weight: 700;
  color: var(--green-600);
  background: var(--green-100);
  border: 1px solid #c8ecd5;
  border-radius: 999px;
  padding: 3px 8px;
  white-space: nowrap;
}
.skills-cta {
  margin-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}
.skills-cta span {
  color: var(--ink-700);
  font-size: 14px;
  line-height: 1.65;
}

/* =============================================================
   场景卡片
   ============================================================= */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.scene {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-xs);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
  overflow: hidden;
}
.scene::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue-500), var(--blue-200));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.scene:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: var(--blue-100); }
.scene:hover::after { transform: scaleX(1); }
.scene__ico {
  width: 50px; height: 50px;
  border-radius: 14px;
  background: var(--blue-050);
  display: grid; place-items: center;
  font-size: 24px;
  margin-bottom: 18px;
}
.scene h3 { font-size: 19px; margin-bottom: 10px; }
.scene p { font-size: 14px; color: var(--ink-500); line-height: 1.7; }
.scene__tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 7px; }
.scene__tags span {
  font-size: 12px;
  color: var(--ink-500);
  padding: 4px 10px;
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
}

/* =============================================================
   课程模块（体验课 / 直播课）
   ============================================================= */
.course {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.course--reverse .course__media { order: 2; }

.course__media {
  position: relative;
}
.course__media .window { box-shadow: var(--shadow-md); }

/* 占位插图（缺图时用） */
.placeholder {
  position: relative;
  border-radius: var(--r-lg);
  border: 1.5px dashed var(--blue-200);
  background:
    linear-gradient(135deg, rgba(255,255,255,0.6), rgba(234,240,255,0.6)),
    repeating-linear-gradient(45deg, transparent, transparent 14px, rgba(75, 80, 230,0.04) 14px, rgba(75, 80, 230,0.04) 28px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px;
  color: var(--blue-700);
  min-height: 320px;
}
.placeholder .ph-ico { font-size: 30px; margin-bottom: 12px; opacity: 0.8; }
.placeholder b { font-size: 15px; }
.placeholder small { font-size: 12.5px; color: var(--ink-400); margin-top: 8px; max-width: 280px; line-height: 1.6; }
.placeholder code {
  margin-top: 12px;
  font-size: 11.5px;
  background: rgba(75, 80, 230,0.07);
  padding: 3px 9px;
  border-radius: 6px;
  color: var(--blue-700);
}

.price-block { display: flex; align-items: flex-end; gap: 14px; margin: 18px 0 8px; }
.price-now {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 600;
  line-height: 0.9;
  color: var(--ink-900);
}
.price-now .yuan { font-size: 26px; vertical-align: super; margin-right: 2px; }
.price-old {
  font-size: 20px;
  color: var(--ink-400);
  text-decoration: line-through;
  margin-bottom: 6px;
}
.price-tag {
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--gold-600);
  background: var(--gold-100);
  border: 1px solid #f0e0b5;
  padding: 5px 10px;
  border-radius: 999px;
}
.price-note { font-size: 14px; color: var(--ink-500); margin-bottom: 22px; }
.price-promo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #b8431a;
  background: linear-gradient(135deg, #fff1e6, #ffe1cc);
  border: 1px solid #ffc9a6;
  padding: 5px 12px;
  border-radius: 999px;
  margin: 4px 0 12px;
}
.scard--gold .price-promo { align-self: flex-start; margin: 6px 0 10px; }

.feat-list { list-style: none; padding: 0; margin: 24px 0; display: grid; gap: 13px; }
.feat-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15.5px;
  color: var(--ink-700);
}
.feat-list .tick {
  flex: 0 0 auto;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--green-100);
  color: var(--green-600);
  display: grid; place-items: center;
  font-size: 12px;
  margin-top: 3px;
}
.feat-list--gold .tick { background: var(--blue-050); color: var(--blue-600); }

.note-box {
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--ink-500);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue-200);
  border-radius: 10px;
  padding: 13px 16px;
}

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.pill {
  font-size: 12.5px; font-weight: 600;
  padding: 6px 13px;
  border-radius: 999px;
  background: var(--blue-050);
  color: var(--blue-700);
  border: 1px solid var(--blue-100);
}
.pill--gold { background: var(--gold-100); color: var(--gold-600); border-color: #f0e0b5; }
.pill--green { background: var(--green-100); color: var(--green-600); border-color: #c8ecd5; }

.course__head { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.course__badge {
  font-size: 12px; font-weight: 700; letter-spacing: 0.08em;
  padding: 5px 12px; border-radius: 999px;
  background: var(--blue-600); color: #fff;
}
.course__badge--gold { background: linear-gradient(135deg, #e7b44e, var(--gold-500)); color: #4a360c; }
.course__title { font-family: var(--font-serif); font-size: clamp(26px, 3.4vw, 36px); }
.course__cta { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; }

/* 直播课权益网格 */
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 24px 0;
}
.benefit {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 15px 16px;
  box-shadow: var(--shadow-xs);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.benefit:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.benefit .b-ico {
  flex: 0 0 auto;
  width: 38px; height: 38px; border-radius: 11px;
  background: var(--blue-050); color: var(--blue-600);
  display: grid; place-items: center; font-size: 18px;
}
.benefit b { display: block; font-size: 14.5px; color: var(--ink-900); }
.benefit small { font-size: 12.5px; color: var(--ink-500); line-height: 1.55; }

/* =============================================================
   对比表
   ============================================================= */
.compare {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.compare table { width: 100%; border-collapse: collapse; }
.compare th, .compare td {
  padding: 18px 24px;
  text-align: left;
  font-size: 15px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.compare thead th {
  background: var(--surface-2);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.compare thead th:first-child { color: var(--ink-400); font-weight: 600; }
.compare .col-head { display: flex; flex-direction: column; gap: 4px; }
.compare .col-head b { font-size: 17px; color: var(--ink-900); font-family: var(--font-serif); }
.compare .col-head span { font-size: 13px; font-weight: 500; }
.compare td:first-child { color: var(--ink-500); font-weight: 500; width: 30%; }
.compare .c-trial { background: rgba(245, 248, 255, 0.5); }
.compare .c-live { background: rgba(251, 242, 220, 0.28); }
.compare tbody tr:hover td { background: var(--surface-2); }
.compare tbody tr:hover td.c-live { background: rgba(251, 242, 220, 0.5); }
.compare .yes { color: var(--green-600); font-weight: 600; }
.compare .no { color: var(--ink-300); }
.compare .em { color: var(--ink-900); font-weight: 600; }

/* =============================================================
   学习路径
   ============================================================= */
.path {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  position: relative;
}
.path::before {
  content: "";
  position: absolute;
  top: 30px; left: 8%; right: 8%;
  height: 2px;
  background: linear-gradient(90deg, var(--blue-200), var(--blue-500), var(--gold-500));
  z-index: 0;
}
.step { position: relative; z-index: 1; text-align: center; }
.step__num {
  width: 60px; height: 60px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--blue-100);
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-size: 24px; font-weight: 600;
  color: var(--blue-600);
  box-shadow: var(--shadow-sm);
}
.step:last-child .step__num { border-color: #f0e0b5; color: var(--gold-600); }
.step h4 { font-size: 16.5px; margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--ink-500); line-height: 1.6; }

/* =============================================================
   案例
   ============================================================= */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
.case-grid .case--wide { grid-column: span 2; }
.case {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}
.case:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.case__img { position: relative; overflow: hidden; background: var(--surface-2); }
.case__img img { width: 100%; transition: transform 0.5s ease; }
.case:hover .case__img img { transform: scale(1.04); }
.case__kicker {
  position: absolute; top: 16px; left: 16px;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11.5px; font-weight: 700; letter-spacing: 0.02em;
  background: var(--blue-050);
  color: var(--blue-700);
  padding: 5px 11px; border-radius: 999px;
}
.case__kicker::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: currentColor;
}
.case__kicker--green { background: var(--green-100); color: var(--green-600); }
.case__kicker--gold { background: var(--gold-100); color: var(--gold-600); }
.case__kicker--violet { background: #ede9fe; color: #7c3aed; }
.case__body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.case__body h3 { font-size: 20px; margin-bottom: 14px; font-family: var(--font-serif); }
.flow-line { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 10px; font-size: 14px; }
.flow-line .lab {
  flex: 0 0 auto;
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  color: var(--ink-400);
  width: 52px; padding-top: 2px;
}
.flow-line .val { color: var(--ink-700); }
.flow-line.out .val { color: var(--ink-900); font-weight: 600; }
.flow-line.out .lab { color: var(--green-600); }

/* 案例宽卡（生图/生视频） */
.case--wide .case__body { padding: 30px 32px; }

/* =============================================================
   FAQ
   ============================================================= */
.faq { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.faq__item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-xs);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.faq__item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue-200);
}
.faq__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  text-align: left;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.6;
}
.faq__q::before {
  content: "Q";
  flex: 0 0 auto;
  width: 27px; height: 27px;
  display: grid; place-items: center;
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 14px; font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  box-shadow: 0 4px 11px rgba(75, 80, 230, 0.26);
}
.faq__a-inner {
  position: relative;
  margin-top: 12px;
  padding-left: 41px;
  font-size: 14.5px;
  color: var(--ink-600);
  line-height: 1.78;
}
.faq__a-inner::before {
  content: "A";
  position: absolute; left: 0; top: 0;
  width: 27px; height: 27px;
  display: grid; place-items: center;
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 14px; font-weight: 800;
  color: var(--green-600);
  background: var(--green-100);
  border: 1px solid #c8ecd5;
}

/* =============================================================
   报名区
   ============================================================= */
.signup {
  position: relative;
  background:
    radial-gradient(800px 400px at 20% 0%, rgba(255,255,255,0.6), rgba(255,255,255,0)),
    linear-gradient(135deg, var(--blue-700), var(--blue-600));
  color: #fff;
  overflow: hidden;
}
.signup::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(45deg, transparent, transparent 22px, rgba(255,255,255,0.03) 22px, rgba(255,255,255,0.03) 44px);
  pointer-events: none;
}
.signup__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.signup h2 {
  color: #fff;
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 42px);
}
.signup__lead { margin-top: 16px; color: rgba(255,255,255,0.84); font-size: 17px; max-width: 520px; line-height: 1.8; }

.signup__cards { margin-top: 30px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.scard {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--r-md);
  padding: 20px;
  backdrop-filter: blur(6px);
  display: flex;
  flex-direction: column;
}
.scard b { display: block; font-size: 15px; }
.scard .sc-price { font-family: var(--font-display); font-size: 30px; font-weight: 600; margin: 8px 0 4px; }
.scard .sc-price s { font-size: 16px; opacity: 0.6; font-weight: 400; margin-right: 6px; }
.scard small { display: block; font-size: 12.5px; color: rgba(255,255,255,0.74); margin-bottom: 14px; }
.scard .btn { width: 100%; margin-top: auto; }
.scard--gold { background: rgba(216,161,58,0.16); border-color: rgba(231,180,78,0.5); }

/* 二维码卡 */
.qr-card {
  background: #fff;
  border-radius: var(--r-lg);
  padding: 26px;
  text-align: center;
  color: var(--ink-900);
  box-shadow: var(--shadow-lg);
}
.qr-card img {
  width: 200px; height: auto;
  margin: 0 auto 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
}
.qr-card b { font-size: 17px; }
.qr-card p { font-size: 13.5px; color: var(--ink-500); margin-top: 8px; }
.qr-card .console-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 16px; font-size: 14px; font-weight: 600; color: var(--blue-600);
}
.qr-card .console-link:hover { gap: 9px; }

.signup__foot {
  position: relative;
  margin-top: 38px;
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  display: flex; flex-wrap: wrap; gap: 8px 22px;
}
.signup__foot span { display: inline-flex; align-items: center; gap: 7px; }

/* =============================================================
   页脚
   ============================================================= */
.footer {
  background: var(--ink-900);
  color: rgba(255,255,255,0.66);
  padding: 56px 0 36px;
}
/* 官网域名 · 页脚大字收尾（投屏时让大家记住 mantai.me） */
.footer__domain {
  text-align: center;
  padding: 12px 0 clamp(40px, 6vw, 64px);
  margin-bottom: clamp(36px, 5vw, 52px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer__domain-eyebrow {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--blue-200);
  margin-bottom: clamp(14px, 2vw, 22px);
}
.footer__domain-url {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(52px, 12vw, 132px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: #fff;
  text-decoration: none;
  transition: opacity 0.2s ease;
}
.footer__domain-url .tld { color: var(--blue-500); }
.footer__domain-url:hover { opacity: 0.86; }
.footer__domain-url .caret {
  display: inline-block;
  width: 0.055em;
  height: 0.78em;
  margin-left: 0.12em;
  background: var(--blue-500);
  border-radius: 3px;
  transform: translateY(0.02em);
  animation: domain-caret 1.05s step-end infinite;
}
@keyframes domain-caret { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.footer__domain-note {
  margin-top: clamp(16px, 2.4vw, 24px);
  font-size: 15px;
  color: rgba(255,255,255,0.6);
}
@media (max-width: 640px) {
  .footer__domain-note { font-size: 13.5px; }
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer .brand { color: #fff; }
.footer__about { margin-top: 16px; font-size: 14px; line-height: 1.8; max-width: 320px; }
.footer h5 { color: #fff; font-size: 14px; margin: 0 0 16px; letter-spacing: 0.05em; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 11px; }
.footer ul a { font-size: 14px; transition: color 0.2s ease; }
.footer ul a:hover { color: #fff; }
.footer__bottom {
  padding-top: 24px;
  display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}
.footer__bottom .disclaim { max-width: 720px; line-height: 1.7; }

/* =============================================================
   （原滚动揭示动画已移除，.reveal / .d1-.d4 现为空占位以兼容既有 HTML）
   ============================================================= */

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* =============================================================
   响应式
   ============================================================= */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .hero__visual { max-width: 560px; }
  .skills-head { grid-template-columns: 1fr; gap: 20px; }
  .skills-meter { max-width: 520px; }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .signup__grid { grid-template-columns: 1fr; gap: 36px; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}

@media (max-width: 860px) {
  .nav__links, .nav__console { display: none; }
  .nav__toggle { display: flex; }
  .nav.open .nav__links {
    display: flex;
    position: absolute;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    margin: 0;
    padding: 16px 24px 22px;
    background: rgba(245, 248, 255, 0.98);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }
  .nav.open .nav__links a { width: 100%; padding: 11px 0; font-size: 16px; }
  .nav.open .nav__console { display: inline-flex; }

  .section { padding: 72px 0; }
  .course { grid-template-columns: 1fr; gap: 36px; }
  .course--reverse .course__media { order: 0; }

  .founders__grid { grid-template-columns: 1fr; gap: 16px; }
  .founder { padding: 22px 20px; gap: 15px; }

  .agents-strip { padding: 22px 0 24px; }
  .agents-strip__inner {
    flex-direction: column;
    gap: 14px;
  }
  .agents-strip__lead { font-size: 13px; }
  .agents-strip__lead::after { display: none; }
  .agents-strip__row {
    display: grid;
    grid-template-columns: repeat(2, auto);
    justify-content: center;
    gap: 14px 32px;
  }
  .agents-strip__item { font-size: 14.5px; }
  .agents-strip__logo { height: 24px; }
  .agents-strip__logo--wordmark { height: 17px; }

  .trust__inner { grid-template-columns: 1fr 1fr; gap: 0; }
  .trust__item { padding: 18px 0; }
  .trust__item + .trust__item { border-left: none; }
  .trust__item:nth-child(odd) { border-right: 1px solid var(--line-soft); }
  .trust__item:nth-child(-n+2) { border-bottom: 1px solid var(--line-soft); }

  .benefit-grid { grid-template-columns: 1fr; }
  .skills-showcase { padding-top: 72px; padding-bottom: 72px; }
  .skills-cta { align-items: stretch; flex-direction: column; }
  .skills-cta .btn { width: 100%; }
  .path { grid-template-columns: 1fr; gap: 0; }
  .path::before { display: none; }
  .step {
    display: grid;
    grid-template-columns: 60px 1fr;
    grid-template-rows: auto auto;
    column-gap: 16px;
    row-gap: 4px;
    text-align: left;
    align-items: start;
    padding: 18px 0;
    border-bottom: 1px solid var(--line-soft);
  }
  .step__num { margin: 0; grid-row: 1 / span 2; align-self: center; }
  .step h4 { grid-column: 2; grid-row: 1; margin: 0; }
  .step p { grid-column: 2; grid-row: 2; }
  .case-grid { grid-template-columns: 1fr; }
  .case-grid .case--wide { grid-column: span 1; }

  .proof__grid { grid-template-columns: 1fr; gap: 24px; }
  .proof__photos { grid-template-rows: 160px 160px; }
  .proof__side .btn { align-self: stretch; margin-top: 4px; }

  /* 对比表 → 卡片 */
  .compare { border: none; background: none; box-shadow: none; }
  .compare table, .compare thead, .compare tbody, .compare th, .compare td, .compare tr { display: block; }
  .compare thead { display: none; }
  .compare tbody tr {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    margin-bottom: 14px;
    padding: 6px 18px;
    box-shadow: var(--shadow-xs);
  }
  .compare td {
    border-bottom: 1px solid var(--line-soft);
    padding: 12px 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .compare td:first-child {
    width: auto;
    grid-template-columns: 1fr;
    color: var(--ink-900);
    font-weight: 700;
    font-size: 15px;
    border-bottom: 1.5px solid var(--line);
  }
  .compare td.c-trial::before { content: "体验课"; display: block; font-size: 11px; color: var(--ink-400); font-weight: 600; }
  .compare td.c-live::before { content: "直播课"; display: block; font-size: 11px; color: var(--gold-600); font-weight: 600; }
  .compare td.c-trial, .compare td.c-live { background: none; grid-template-columns: 1fr; }
  .compare tbody tr td:last-child { border-bottom: none; }

  .signup__cards { grid-template-columns: 1fr; }

  .download__btns { flex-direction: column; align-items: stretch; }
  .download__btns .btn { width: 100%; min-width: 0; }
}

@media (max-width: 520px) {
  :root { --nav-h: 60px; }
  .wrap { padding: 0 18px; }
  .skill-board { grid-template-columns: 1fr; gap: 14px; }
  .skills-meter {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 18px;
    border-radius: 20px;
  }
  .skills-meter__num { font-size: 40px; }
  .skill-cat { padding: 16px; border-radius: 20px; }
  .skill-cat__top { gap: 11px; margin-bottom: 14px; }
  .skill-cat__ico { width: 38px; height: 38px; border-radius: 12px; font-size: 18px; }
  .skill-cat h3 { font-size: 17px; }
  .skill-cat p { font-size: 12.5px; }
  .skill-item {
    grid-template-columns: 32px minmax(0, 1fr);
    min-height: auto;
    padding: 10px;
    align-items: start;
  }
  .skill-item__ico { width: 32px; height: 32px; border-radius: 9px; font-size: 15px; }
  .skill-item b { font-size: 13px; }
  .skill-item small { font-size: 11px; }
  .skill-item em {
    grid-column: 2;
    justify-self: start;
    margin-top: -2px;
  }
  .skills-cta { padding: 16px; border-radius: 20px; }
  .scene-grid { grid-template-columns: 1fr; }

  /* ---- 导航 ---- */
  .nav__inner { gap: 10px; }
  .brand { gap: 9px; }
  .brand__mark { width: 36px; height: 36px; }
  .brand__name { font-size: 15px; }
  .brand__sub { display: none; }
  .nav__right { gap: 8px; }
  .nav__right .btn-sm { padding: 8px 14px; font-size: 13px; }
  .nav__toggle { width: 38px; height: 38px; border-radius: 10px; }

  /* ---- Hero ---- */
  .hero { padding: 32px 0 68px; }
  .hero__grid { gap: 40px; }
  .hero__title { font-size: 32px; line-height: 1.15; margin-top: 16px; letter-spacing: -0.02em; }
  .hero__title em::after { height: 9px; bottom: 3px; }
  .hero__sub { font-size: 15px; margin-top: 16px; line-height: 1.7; max-width: none; }
  .hero__cta { margin-top: 22px; gap: 10px; flex-direction: column; align-items: stretch; }
  .hero__cta .btn { width: 100%; flex: none; padding: 13px 20px; }

  .price-chips { margin-top: 22px; gap: 8px; }
  .chip { width: 100%; box-sizing: border-box; padding: 10px 14px; }
  .chip b { font-size: 18px; }

  .hero__trust { margin-top: 22px; gap: 12px; align-items: center; }
  .avatars .ava, .avatars .more { width: 32px; height: 32px; margin-left: -10px; border-width: 2px; }
  .trust-text { font-size: 12.5px; line-height: 1.45; }
  .trust-text b { font-size: 13px; }

  /* ---- Hero 视觉窗口 ---- */
  .hero__visual { max-width: 100%; }
  .window { border-radius: 20px; }
  .window__bar { height: 34px; padding: 0 12px; }
  .window__bar i { width: 9px; height: 9px; }

  .float-card { padding: 9px 12px; font-size: 12.5px; gap: 9px; border-radius: 12px; }
  .float-card small { font-size: 11px; }
  .float-card .dot { width: 28px; height: 28px; font-size: 14px; border-radius: 8px; }
  .float-card--wechat { top: 10px; right: 8px; }
  .float-card--done { bottom: -14px; left: 8px; }

  /* ---- Section 通用 ---- */
  .section { padding: 56px 0; }
  .section--tight { padding: 44px 0; }
  .section-head { margin-bottom: 32px; }
  .section-title { font-size: 24px; margin-top: 12px; line-height: 1.25; }
  .section-sub { font-size: 14.5px; margin-top: 12px; line-height: 1.7; }
  .eyebrow { font-size: 11.5px; padding: 6px 12px; letter-spacing: 0.1em; }

  .btn { padding: 12px 22px; font-size: 14px; }

  /* ---- Agent logo 条 ---- */
  .agents-strip { padding: 20px 0 22px; }
  .agents-strip__row { grid-template-columns: repeat(2, auto); gap: 14px 24px; }
  .agents-strip__item { font-size: 13.5px; }
  .agents-strip__logo { height: 22px; }
  .agents-strip__logo--wordmark { height: 16px; }

  /* ---- 信任条 ---- */
  .trust__num { font-size: 28px; }
  .trust__label { font-size: 13px; margin-top: 8px; }

  /* ---- 课程模块 ---- */
  .course { gap: 24px; }
  .course__title { font-size: 22px; line-height: 1.3; }
  .price-block { flex-wrap: wrap; gap: 10px; margin: 14px 0 6px; }
  .price-now { font-size: 44px; }
  .price-now .yuan { font-size: 20px; }
  .price-old { font-size: 17px; margin-bottom: 4px; }
  .price-tag { font-size: 11px; padding: 4px 9px; }
  .price-note { font-size: 13.5px; margin-bottom: 16px; line-height: 1.7; }
  .feat-list { gap: 10px; margin: 18px 0; }
  .feat-list li { font-size: 14px; gap: 10px; line-height: 1.6; }
  .course__cta { flex-direction: column; align-items: stretch; gap: 10px; margin-top: 22px; }
  .course__cta .btn { width: 100%; }
  .course__badge { font-size: 11px; padding: 4px 10px; letter-spacing: 0.06em; }
  .pill { font-size: 11.5px; padding: 5px 11px; }

  .benefit-grid { gap: 10px; margin: 18px 0; }
  .benefit { padding: 12px 14px; gap: 10px; }
  .benefit .b-ico { width: 34px; height: 34px; font-size: 16px; }
  .benefit b { font-size: 13.5px; }
  .benefit small { font-size: 12px; }

  /* ---- 对比表卡片 ---- */
  .compare tbody tr { padding: 4px 14px; margin-bottom: 12px; }
  .compare td { padding: 10px 0; font-size: 13.5px; }
  .compare td:first-child { font-size: 14px; }

  /* ---- 学习路径 ---- */
  .step { grid-template-columns: 52px 1fr; gap: 14px; padding: 12px 0; }
  .step__num { width: 52px; height: 52px; font-size: 22px; }
  .step h4 { font-size: 15.5px; margin-bottom: 4px; }
  .step p { font-size: 13px; line-height: 1.6; }

  /* ---- 案例 ---- */
  .case__body { padding: 18px 20px; }
  .case--wide .case__body { padding: 20px 22px; }
  .case__body h3 { font-size: 17px; margin-bottom: 10px; }
  .flow-line { font-size: 13px; }
  .flow-line .lab { width: 44px; font-size: 10.5px; }
  .case__art { height: 250px; }
  .case--wide .case__art { height: 260px; }
  .art-pad { padding: 34px 18px 16px; }

  /* ---- FAQ ---- */
  .faq__item { padding: 18px 20px; }
  .faq__q { font-size: 15px; gap: 10px; }
  .faq__q::before { width: 24px; height: 24px; font-size: 12px; }
  .faq__a-inner { padding-left: 34px; font-size: 13.5px; margin-top: 10px; line-height: 1.7; }
  .faq__a-inner::before { width: 24px; height: 24px; font-size: 12px; }

  /* ---- 报名区 ---- */
  .signup { padding: 56px 0; }
  .signup h2 { font-size: 26px; }
  .signup__lead { font-size: 15px; margin-top: 12px; line-height: 1.75; }
  .signup__cards { margin-top: 22px; gap: 12px; }
  .scard { padding: 18px; }
  .scard .sc-price { font-size: 26px; }
  .signup__foot { font-size: 12px; margin-top: 26px; gap: 6px 16px; }
  .qr-card { padding: 22px 20px; }
  .qr-card img { width: 168px; }
  .qr-card b { font-size: 15px; }

  /* ---- 页脚 ---- */
  .footer { padding: 44px 0 28px; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 24px 20px; padding-bottom: 28px; }
  .footer__about { font-size: 13px; margin-top: 12px; line-height: 1.7; }
  .footer__bottom { padding-top: 20px; flex-direction: column; gap: 8px; font-size: 12px; }
  .footer__bottom .disclaim { line-height: 1.6; }
}