/* =========================================================
   AI智能体工程师集训营 —— 全站样式 v2
   UI 参考：故事生长系统 / 统御万族设定站（暗色史诗 · 金色强调）
   设计令牌 + 基础 + 组件；/assets/css/main.css
   ========================================================= */

/* ---------- 设计令牌 ---------- */
:root {
  --bg0: #070a14;
  --bg1: #0c1020;
  --bg2: #111730;
  --ink: #eae8f2;
  --mut: #9aa0b8;
  --dim: #6b7190;
  --gold: #e9b25f;
  --gold2: #f6d08a;
  --gold-ink: #241603;
  --teal: #6fe3d0;
  --violet: #8b7cf6;
  --red: #e05a4e;
  --line: rgba(255, 255, 255, 0.09);
  --line-soft: rgba(255, 255, 255, 0.055);
  --card: rgba(255, 255, 255, 0.035);
  --card2: linear-gradient(180deg, var(--bg2), var(--bg1));

  --serif: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Songti SC", SimSun, "STSong", "Microsoft YaHei", Georgia, "Times New Roman", serif;
  --sans: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, Menlo, monospace;

  --gold-grad: linear-gradient(135deg, var(--gold2), var(--gold));
  --glow-gold: 0 16px 44px -16px rgba(233, 178, 95, 0.5);

  --tone-indigo: #8b7cf6;
  --tone-cyan: #6fe3d0;
  --tone-violet: #c9a0ff;
  --tone-emerald: #5ee0a4;
  --tone-amber: #f6d08a;

  --radius-s: 8px;
  --radius: 12px;
  --radius-l: 16px;

  --container: 1200px;
  --header-h: 64px;
}

[data-tone="indigo"] { --acc: var(--tone-indigo); }
[data-tone="cyan"] { --acc: var(--tone-cyan); }
[data-tone="violet"] { --acc: var(--tone-violet); }
[data-tone="emerald"] { --acc: var(--tone-emerald); }
[data-tone="amber"] { --acc: var(--tone-amber); }

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg0);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: rgba(233, 178, 95, 0.32); color: #fff; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg0); }
::-webkit-scrollbar-thumb { background: #232a44; border-radius: 99px; border: 2px solid var(--bg0); }
::-webkit-scrollbar-thumb:hover { background: #313a5e; }
h1, h2, h3, h4 { margin: 0; line-height: 1.4; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: var(--sans); }

/* 氛围层：暗角 + 胶片噪点 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: radial-gradient(120% 90% at 50% 6%, transparent 42%, rgba(2, 4, 10, 0.55) 100%);
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: 90; pointer-events: none; opacity: 0.05;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.7'/%3E%3C/svg%3E");
}
main, .site-footer, .site-header { position: relative; z-index: 2; }

.container { max-width: var(--container); margin-inline: auto; padding-inline: 24px; }
.section { padding: 82px 0; }
.section--soft {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.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; }
.skip-link { position: absolute; left: -999px; top: 8px; z-index: 200; background: var(--gold); color: var(--gold-ink); padding: 10px 16px; border-radius: 8px; font-weight: 600; }
.skip-link:focus { left: 8px; }

/* 滚动浮现（仅在 html.js 时启用；无 JS 不影响阅读） */
html.js [data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity 0.85s cubic-bezier(0.2, 0.6, 0.2, 1), transform 0.85s cubic-bezier(0.2, 0.6, 0.2, 1); }
html.js [data-reveal].in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.js [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 11px; border: 1px solid transparent;
  font-size: 15px; letter-spacing: 2px; font-weight: 500; line-height: 1.2; cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}
.btn:active { transform: translateY(1px); }
.btn--sm { padding: 8px 16px; font-size: 13px; letter-spacing: 1px; border-radius: 9px; }
.btn--lg { padding: 15px 32px; font-size: 15px; }
.btn--primary { background: var(--gold-grad); color: var(--gold-ink); font-weight: 600; box-shadow: var(--glow-gold); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 22px 54px -16px rgba(233, 178, 95, 0.72); }
.btn--ghost, .btn--hero-ghost, .btn--outline { border-color: var(--line); color: var(--ink); background: rgba(255, 255, 255, 0.02); }
.btn--ghost:hover, .btn--hero-ghost:hover, .btn--outline:hover { border-color: rgba(233, 178, 95, 0.55); color: var(--gold2); transform: translateY(-3px); }

/* ---------- 页头 ---------- */
.site-header {
  top: 0; z-index: 60;
  background: rgba(7, 10, 20, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s ease;
}
.site-header.is-scrolled { box-shadow: 0 10px 34px -18px rgba(0, 0, 0, 0.9); }
.site-header__inner { height: var(--header-h); display: flex; align-items: center; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-family: var(--serif); font-size: 17px; letter-spacing: 3px; color: var(--ink); white-space: nowrap; }
.brand__mark {
  width: 34px; height: 34px; display: grid; place-items: center; flex: 0 0 auto;
  background: var(--gold-grad); color: var(--gold-ink); border-radius: 9px;
  font-family: var(--sans); font-weight: 800; font-size: 12px; letter-spacing: 0.5px;
  box-shadow: 0 8px 22px -8px rgba(233, 178, 95, 0.85);
}
.brand__text { white-space: nowrap; }
.site-nav__list { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav__link {
  display: inline-block; position: relative; padding: 7px 10px;
  color: var(--mut); font-size: 13px; letter-spacing: 2px; white-space: nowrap;
  transition: color 0.3s ease;
}
.nav__link::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: 2px; height: 1px; background: var(--gold); width: 0; transition: width 0.35s ease; }
.nav__link:hover { color: var(--ink); }
.nav__link:hover::after { width: calc(100% - 20px); }
.nav__link.is-active { color: var(--gold2); }
.nav__link.is-active::after { width: calc(100% - 20px); }
.site-header__cta { margin-left: 6px; }

/* 移动端导航 */
.site-nav-mobile { display: none; position: relative; }
@media (max-width: 899px) {
  .site-nav { display: none; }
  .site-header__cta { display: none; }
  .site-nav-mobile { display: block; }
  .site-nav-mobile__toggle { list-style: none; cursor: pointer; padding: 10px; border-radius: 8px; }
  .site-nav-mobile__toggle::-webkit-details-marker { display: none; }
  .hamburger { position: relative; display: block; width: 22px; height: 2px; border-radius: 2px; background: var(--gold2); }
  .hamburger::before, .hamburger::after { content: ""; position: absolute; left: 0; width: 22px; height: 2px; border-radius: 2px; background: var(--gold2); transition: transform 0.2s ease, top 0.2s ease; }
  .hamburger::before { top: -7px; }
  .hamburger::after { top: 7px; }
  .site-nav-mobile[open] .hamburger { background: transparent; }
  .site-nav-mobile[open] .hamburger::before { top: 0; transform: rotate(45deg); }
  .site-nav-mobile[open] .hamburger::after { top: 0; transform: rotate(-45deg); }
  .site-nav-mobile__list { position: absolute; right: 0; top: calc(100% + 10px); width: 232px; background: var(--bg1); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.9); padding: 10px; display: grid; gap: 2px; }
  .site-nav-mobile__list a { display: block; padding: 11px 14px; border-radius: 9px; font-size: 14px; letter-spacing: 2px; color: var(--mut); }
  .site-nav-mobile__list a:hover { background: rgba(255, 255, 255, 0.05); color: var(--gold2); }
  .site-nav-mobile__list .btn { margin-top: 6px; text-align: center; color: var(--gold-ink); }
}

/* ---------- Hero（首页 / 内页共用氛围） ---------- */
.hero, .page-hero {
  position: relative; overflow: hidden; color: var(--ink);
  background:
    radial-gradient(900px 460px at 12% -12%, rgba(233, 178, 95, 0.16), transparent 62%),
    radial-gradient(820px 440px at 90% -8%, rgba(111, 227, 208, 0.08), transparent 58%),
    var(--bg0);
  border-bottom: 1px solid var(--line);
}
.hero { padding: 118px 0 96px; }
.page-hero { padding: 84px 0 70px; }
.page-hero__inner { max-width: 920px; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border: 1px solid rgba(233, 178, 95, 0.4); border-radius: 999px;
  background: rgba(233, 178, 95, 0.08); color: var(--gold2);
  font-size: 12px; letter-spacing: 3px; margin-bottom: 26px;
}
.hero__title {
  max-width: 820px;
  font-family: var(--serif); font-size: clamp(36px, 5.4vw, 62px); font-weight: 600;
  letter-spacing: 3px; line-height: 1.28; color: var(--ink);
  text-shadow: 0 0 44px rgba(233, 178, 95, 0.1);
}
.hero__subtitle { margin-top: 22px; max-width: 680px; font-size: clamp(15px, 1.8vw, 17px); color: var(--mut); line-height: 2; letter-spacing: 0.5px; }
.hero__actions { margin-top: 38px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero__stats { margin-top: 56px; display: flex; flex-wrap: wrap; max-width: 860px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.hero__stat { display: flex; align-items: center; gap: 16px; padding: 18px 28px 18px 0; }
.hero__stat + .hero__stat { border-left: 1px solid var(--line); padding-left: 28px; }
.hero__stat-value { font-family: var(--serif); font-size: 34px; font-weight: 600; color: var(--gold2); line-height: 1; }
.hero__stat-label { color: var(--mut); font-size: 13px; letter-spacing: 1px; max-width: 150px; }

.page-hero__kicker { color: var(--gold); font-size: 12px; letter-spacing: 4px; font-weight: 600; margin-bottom: 16px; }
.page-hero h1 { font-family: var(--serif); font-size: clamp(30px, 4.4vw, 46px); font-weight: 600; letter-spacing: 3px; }
.page-hero__desc { margin-top: 18px; font-size: 16px; color: var(--mut); max-width: 760px; line-height: 1.95; }

/* ---------- 章节标题 ---------- */
.section-head { margin-bottom: 42px; max-width: 820px; }
.section-head__kicker { color: var(--gold); font-weight: 600; letter-spacing: 4px; font-size: 12px; margin-bottom: 12px; }
.section-head h2 { font-family: var(--serif); font-size: clamp(24px, 3.2vw, 36px); font-weight: 600; letter-spacing: 3px; line-height: 1.4; }
.section-head h2::after { content: ""; display: block; width: 58px; height: 2px; margin-top: 16px; background: linear-gradient(90deg, var(--gold), transparent); border-radius: 2px; }
.section-head__desc { margin-top: 16px; color: var(--mut); font-size: 15.5px; letter-spacing: 0.4px; }
.section-actions { margin-top: 42px; display: flex; gap: 14px; flex-wrap: wrap; }
.count-line { color: var(--dim); font-size: 13px; margin-bottom: 22px; letter-spacing: 1px; }

/* ---------- 提示条 / 空状态 ---------- */
.draft-banner { display: flex; align-items: flex-start; gap: 12px; padding: 15px 18px; border: 1px dashed rgba(233, 178, 95, 0.5); background: rgba(233, 178, 95, 0.07); border-radius: var(--radius); color: #efd9ad; font-size: 13.5px; }
.draft-banner__icon { color: var(--gold); line-height: 1.5; }
.empty-note { padding: 34px; text-align: center; border: 1px dashed var(--line); border-radius: var(--radius); color: var(--dim); background: rgba(255, 255, 255, 0.015); }
.example-note { padding: 13px 16px; border: 1px dashed rgba(233, 178, 95, 0.5); background: rgba(233, 178, 95, 0.07); color: #efd9ad; border-radius: var(--radius-s); font-size: 13px; margin-top: 26px; }

/* ---------- 面板 ---------- */
.panel { background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 28px; }
.panel__title { display: flex; align-items: baseline; gap: 10px; font-family: var(--serif); font-size: 20px; letter-spacing: 2px; font-weight: 600; margin-bottom: 18px; }
.panel__hint { font-size: 12px; color: var(--dim); font-weight: 400; }
.panel__foot { margin-top: 16px; color: var(--dim); font-size: 13px; }

/* ---------- 通用网格 ---------- */
.cards-grid { display: grid; gap: 20px; }
.cards-grid--2 { grid-template-columns: repeat(2, 1fr); }
.cards-grid--4 { grid-template-columns: repeat(4, 1fr); }
.split-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
.split-grid--aside { grid-template-columns: 1.5fr 1fr; }
@media (max-width: 1023px) {
  .cards-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .cards-grid--2 { grid-template-columns: 1fr; }
  .split-grid, .split-grid--aside { grid-template-columns: 1fr; }
}
@media (max-width: 599px) {
  .cards-grid--4 { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
}

/* ---------- 特性卡片 ---------- */
.feature-card { background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 24px; transition: transform 0.35s ease, border-color 0.35s ease, background 0.35s ease; }
.feature-card:hover { transform: translateY(-4px); border-color: rgba(233, 178, 95, 0.35); background: linear-gradient(180deg, #141b36, #0e1326); }
.feature-card__icon { font-size: 26px; line-height: 1; display: inline-block; filter: drop-shadow(0 0 12px rgba(233, 178, 95, 0.25)); }
.feature-card h3 { margin: 16px 0 8px; font-family: var(--serif); font-size: 18px; letter-spacing: 2px; font-weight: 600; color: var(--gold2); }
.feature-card p { color: var(--mut); font-size: 13.5px; line-height: 1.9; }

/* ---------- 徽标 / 标签 / 胶囊 ---------- */
.badge { display: inline-flex; align-items: center; padding: 4px 11px; border-radius: 999px; font-size: 11px; letter-spacing: 1px; font-weight: 600; }
.badge--example { background: rgba(233, 178, 95, 0.14); color: var(--gold2); border: 1px solid rgba(233, 178, 95, 0.4); }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-size: 12px; padding: 4px 11px; border-radius: 999px; background: rgba(255, 255, 255, 0.04); color: var(--mut); border: 1px solid var(--line); letter-spacing: 1px; }
.chip { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; padding: 5px 13px; border-radius: 999px; background: rgba(255, 255, 255, 0.035); border: 1px solid var(--line); color: var(--mut); letter-spacing: 0.5px; }
a.chip--link { color: var(--mut); font-weight: 400; }
a.chip--link b { color: var(--gold2); font-family: var(--mono); margin-right: 3px; }
a.chip--link:hover { border-color: rgba(233, 178, 95, 0.55); color: var(--gold2); }

.link-arrow { color: var(--acc, var(--gold2)); font-weight: 500; font-size: 13px; letter-spacing: 1px; display: inline-block; }
.link-arrow:hover { text-decoration: underline; text-underline-offset: 5px; }

/* ---------- 课程卡片 ---------- */
.course-card {
  --acc: var(--tone-indigo);
  position: relative; display: flex; flex-direction: column; gap: 12px;
  background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 24px 24px 22px; overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease;
}
.course-card::before { content: ""; position: absolute; top: 0; left: 0; bottom: 0; width: 3px; background: linear-gradient(180deg, var(--acc), transparent); }
.course-card:hover { transform: translateY(-4px); border-color: rgba(233, 178, 95, 0.3); }
.course-card__head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.course-card__no { font-family: var(--mono); font-weight: 600; color: var(--acc); font-size: 12px; letter-spacing: 2px; }
.course-card__title { font-family: var(--serif); font-size: 18px; font-weight: 600; letter-spacing: 1px; line-height: 1.5; }
.course-card__title a { transition: color 0.25s ease; }
.course-card__title a:hover { color: var(--gold2); }
.course-card__subtitle { color: var(--dim); font-size: 13px; margin-top: -6px; letter-spacing: 0.5px; }
.course-card__summary { color: var(--mut); font-size: 13.5px; line-height: 1.85; flex: 1; }
.course-card__meta { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; padding: 11px 12px; background: rgba(255, 255, 255, 0.028); border: 1px solid var(--line-soft); border-radius: 10px; }
.course-card__meta-item { display: flex; flex-direction: column; gap: 1px; font-size: 12.5px; color: var(--mut); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-card__meta-item b { color: var(--dim); font-weight: 500; font-size: 11px; letter-spacing: 1px; }

/* ---------- 阶段卡片（首页概览） ---------- */
.stage-cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; }
.stage-card {
  --acc: var(--tone-indigo);
  position: relative; display: flex; flex-direction: column; gap: 10px;
  background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 22px; overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease;
}
.stage-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--acc), transparent 80%); }
.stage-card:hover { transform: translateY(-4px); border-color: rgba(233, 178, 95, 0.3); }
.stage-card__no { font-family: var(--mono); font-weight: 600; color: var(--acc); font-size: 13px; letter-spacing: 3px; }
.stage-card h3 { font-family: var(--serif); font-size: 16.5px; font-weight: 600; letter-spacing: 1.5px; line-height: 1.5; }
.stage-card > p:not(.stage-card__modules) { color: var(--mut); font-size: 13px; line-height: 1.85; }
.stage-card__modules { display: flex; flex-wrap: wrap; gap: 6px; }
.stage-card .link-arrow { margin-top: auto; padding-top: 10px; }

/* ---------- 阶段区块（课程体系页） ---------- */
.stages { display: grid; gap: 30px; }
.stage-block {
  --acc: var(--tone-indigo);
  position: relative; overflow: hidden;
  background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 32px; scroll-margin-top: calc(var(--header-h) + 24px);
}
.stage-block::before { content: ""; position: absolute; top: 0; left: 0; bottom: 0; width: 3px; background: linear-gradient(180deg, var(--acc), transparent); }
.stage-block__head { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.stage-block__no { font-family: var(--mono); font-weight: 600; color: var(--acc); font-size: 12px; letter-spacing: 3px; }
.stage-block__head h3 { font-family: var(--serif); font-size: 23px; font-weight: 600; letter-spacing: 2px; }
.stage-block__subtitle { color: var(--dim); font-size: 13px; letter-spacing: 0.5px; }
.stage-block__summary { color: var(--mut); font-size: 14px; line-height: 1.9; margin-bottom: 18px; max-width: 880px; }
.stage-block__modules { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 18px; }
.stage-block__label { font-size: 12px; color: var(--dim); font-weight: 500; letter-spacing: 2px; margin-right: 2px; }
.stage-block__courses { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.anchor-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 34px; }

/* ---------- 列表样式 ---------- */
.check-list { display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 30px; font-size: 14px; line-height: 1.8; color: var(--mut); }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 2px; width: 20px; height: 20px; display: grid; place-items: center; background: var(--gold-grad); color: var(--gold-ink); border-radius: 50%; font-size: 11px; font-weight: 700; }
.format-list { display: grid; gap: 16px; }
.format-item { display: flex; flex-direction: column; gap: 2px; padding-left: 14px; border-left: 2px solid var(--line); }
.format-item b { font-size: 14.5px; color: var(--ink); letter-spacing: 1px; }
.format-item span { color: var(--mut); font-size: 13.5px; line-height: 1.8; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 12px; }
.faq-item { background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: border-color 0.3s ease; }
.faq-item[open] { border-color: rgba(233, 178, 95, 0.35); }
.faq-item summary { cursor: pointer; padding: 17px 48px 17px 20px; font-weight: 500; font-size: 15px; letter-spacing: 1px; list-style: none; position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); font-size: 22px; font-weight: 400; color: var(--gold); transition: transform 0.2s ease; }
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item[open] summary { border-bottom: 1px solid var(--line-soft); }
.faq-item__body { padding: 14px 20px 18px; color: var(--mut); font-size: 14px; line-height: 1.9; }
/* ---------- CTA ---------- */
.cta-band {
  position: relative; overflow: hidden; color: var(--ink);
  background:
    radial-gradient(760px 380px at 82% 20%, rgba(233, 178, 95, 0.14), transparent 60%),
    linear-gradient(180deg, var(--bg2), var(--bg0));
  border-top: 1px solid var(--line);
  padding: 78px 0;
}
.cta-band__inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band__text h2 { font-family: var(--serif); font-size: clamp(23px, 3vw, 30px); font-weight: 600; letter-spacing: 3px; }
.cta-band__text p { margin-top: 12px; color: var(--mut); }
.cta-band__contact { font-size: 13px; color: var(--gold2); }
.cta-band__actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 课程详情 ---------- */
.detail { --acc: var(--tone-indigo); padding-bottom: 24px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; padding-top: 28px; font-size: 13px; color: var(--dim); letter-spacing: 1px; }
.breadcrumb a:hover { color: var(--gold2); }
.detail__head {
  position: relative; margin-top: 22px;
  background: var(--card2); border: 1px solid var(--line); border-top: 2px solid var(--acc);
  border-radius: var(--radius-l); padding: 34px;
}
.detail__head-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.detail__no { font-family: var(--mono); font-weight: 600; color: var(--acc); letter-spacing: 3px; font-size: 13px; }
.detail__head h1 { font-family: var(--serif); font-size: clamp(25px, 3.6vw, 38px); font-weight: 600; letter-spacing: 2px; line-height: 1.35; }
.detail__subtitle { margin-top: 12px; color: var(--gold2); font-weight: 500; font-size: 15px; letter-spacing: 1px; }
.detail__summary { margin-top: 20px; color: var(--mut); font-size: 15px; line-height: 2; border-left: 2px solid var(--line); padding-left: 16px; }
.detail-meta { margin-top: 24px; display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; }
.detail-meta__item { display: flex; flex-direction: column; gap: 2px; padding: 12px 15px; background: rgba(255, 255, 255, 0.028); border: 1px solid var(--line-soft); border-radius: 10px; }
.detail-meta__item b { font-size: 11px; color: var(--dim); font-weight: 500; letter-spacing: 2px; }
.detail-meta__item span { font-size: 14px; font-weight: 500; color: var(--ink); }
.detail__tags { margin-top: 18px; }
.detail__body { margin-top: 26px; display: grid; gap: 20px; }
.detail__body .panel { box-shadow: none; }
.outline-item { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px dashed var(--line-soft); }
.outline-item:last-child { border-bottom: none; }
.outline-item__idx { font-family: var(--mono); font-weight: 600; color: var(--acc); font-size: 12px; line-height: 2.1; flex: none; }
.outline-item__head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 14.5px; color: var(--ink); }
.outline-item__desc { margin-top: 4px; color: var(--mut); font-size: 13px; line-height: 1.8; }
.detail__foot { margin-top: 8px; display: flex; gap: 12px; flex-wrap: wrap; padding: 10px 0 64px; }

/* ---------- 开班计划 ---------- */
.table-wrap { overflow-x: auto; background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l); }
.schedule-table { width: 100%; border-collapse: collapse; min-width: 620px; }
.schedule-table th { background: rgba(255, 255, 255, 0.035); text-align: left; padding: 13px 18px; font-size: 12px; color: var(--dim); letter-spacing: 2px; border-bottom: 1px solid var(--line); }
.schedule-table td { padding: 15px 18px; border-top: 1px solid var(--line-soft); font-size: 14px; color: var(--mut); }
.status { display: inline-block; padding: 4px 11px; border-radius: 999px; font-size: 12px; letter-spacing: 1px; }
.status--open { background: rgba(111, 227, 208, 0.12); color: var(--teal); }
.status--planned { background: rgba(139, 124, 246, 0.14); color: #b3a8fb; }
.status--full { background: rgba(233, 178, 95, 0.14); color: var(--gold2); }
.status--closed { background: rgba(255, 255, 255, 0.06); color: var(--dim); }

/* ---------- 报名页 ---------- */
.form { display: grid; gap: 16px; }
.form__field { display: grid; gap: 7px; font-size: 13px; color: var(--mut); letter-spacing: 1px; font-weight: 500; }
.form__field input, .form__field select, .form__field textarea {
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  font: inherit; color: var(--ink); background: rgba(255, 255, 255, 0.028); width: 100%;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.form__field input:focus, .form__field select:focus, .form__field textarea:focus { outline: none; border-color: var(--gold); box-shadow: 0 0 0 3px rgba(233, 178, 95, 0.12); }
.form__field select option { background: var(--bg1); color: var(--ink); }
.form__hint { font-size: 12px; color: var(--dim); }
.contact-list { display: grid; gap: 12px; }
.contact-list li { display: flex; flex-direction: column; gap: 2px; padding: 12px 15px; border-radius: 10px; background: rgba(255, 255, 255, 0.028); border: 1px solid var(--line-soft); }
.contact-list b { font-size: 11px; color: var(--dim); font-weight: 500; letter-spacing: 2px; }
.contact-list span { font-size: 14px; font-weight: 500; color: var(--ink); }

/* ---------- 404 ---------- */
.notfound { padding: 120px 0; }
.notfound__inner { max-width: 560px; margin-inline: auto; text-align: center; display: grid; gap: 12px; }
.notfound__code { font-size: 96px; font-weight: 600; line-height: 1; font-family: var(--serif); background: linear-gradient(180deg, var(--gold2), var(--gold)); -webkit-background-clip: text; background-clip: text; color: transparent; text-shadow: 0 0 60px rgba(233, 178, 95, 0.15); }
.notfound h1 { font-family: var(--serif); font-size: 28px; letter-spacing: 3px; font-weight: 600; }
.notfound p:not(.notfound__code) { color: var(--mut); }
.notfound .section-actions { justify-content: center; }

/* ---------- 页脚 ---------- */
.site-footer { background: #05070e; color: var(--mut); padding: 62px 0 24px; border-top: 1px solid var(--line); }
.site-footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; }
.site-footer__name { color: var(--ink); font-family: var(--serif); font-size: 18px; letter-spacing: 2px; font-weight: 600; margin-bottom: 12px; }
.site-footer__slogan { color: var(--dim); font-size: 13.5px; max-width: 380px; line-height: 1.9; }
.site-footer__title { color: var(--gold2); font-size: 13px; letter-spacing: 3px; font-weight: 600; margin-bottom: 16px; }
.site-footer__col ul { display: grid; gap: 8px; }
.site-footer__col a { transition: color 0.25s ease; color: var(--mut); }
.site-footer__col a:hover { color: var(--gold2); }
.site-footer__contact li { font-size: 13.5px; color: var(--mut); }
.site-footer__bottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--line-soft); padding-top: 20px; font-size: 12px; color: var(--dim); }
@media (max-width: 800px) {
  .site-footer__grid { grid-template-columns: 1fr; gap: 30px; }
}
@media (max-width: 599px) {
  .hero { padding: 84px 0 64px; }
  .hero__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
  .hero__stat { padding: 14px 6px 14px 0; }
  .hero__stat + .hero__stat { border-left: none; padding-left: 0; }
  .hero__stat:nth-child(even) { padding-left: 16px; border-left: 1px solid var(--line); }
}
/* ---------- 学费与权益卡（首页 / 开班页） ---------- */
.price-card {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  border-radius: var(--radius-l);
  background: var(--c-surface);
  box-shadow: var(--shadow-m);
  overflow: hidden;
  border: 1px solid var(--c-border);
}
.price-card__summary {
  color: #fff;
  background: linear-gradient(150deg, #131c3f 0%, #1d3a70 55%, #0d5f7c 100%);
  padding: 34px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}
.price-card__label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 3px;
  font-weight: 700;
  color: #c7d2fe;
}
.price-card__badge {
  background: linear-gradient(90deg, #f59e0b, #f97316);
  color: #fff;
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
}
.price-card__amount {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: clamp(36px, 4vw, 50px);
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.1;
}
.price-card__currency { font-size: 0.5em; font-weight: 800; }
.price-card__unit { font-size: 15px; color: #c3cdf0; font-weight: 600; }
.price-card__compare { font-size: 14px; color: #dbe4ff; }
.price-card__compare s { color: #93a3c7; }
.price-card__note { font-size: 13.5px; color: #aebdf0; line-height: 1.7; margin-top: 6px; }
.price-card__detail {
  padding: 34px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
}
.price-card__title { font-size: 18px; font-weight: 800; }
.price-card__list { display: grid; gap: 4px; }
.price-card__actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 6px; }
@media (max-width: 800px) {
  .price-card { grid-template-columns: 1fr; }
  .price-card__summary { padding: 28px 24px; }
  .price-card__detail { padding: 26px 24px; }
}

/* ---------- 学费与权益卡片 ---------- */
.price-card {
  --acc: var(--tone-emerald);
  display: grid; grid-template-columns: 1fr 1.2fr; overflow: hidden;
  background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l);
}
.price-card[data-tone="emerald"] { --acc: var(--tone-emerald); }
.price-card__summary {
  display: flex; flex-direction: column; gap: 12px; padding: 38px 36px;
  background: linear-gradient(160deg, rgba(233, 178, 95, 0.12), transparent 72%), rgba(255, 255, 255, 0.02);
  border-right: 1px solid var(--line);
}
.price-card__label { display: flex; align-items: center; gap: 10px; color: var(--gold2); letter-spacing: 3px; font-size: 13px; font-weight: 600; }
.price-card__badge { background: rgba(233, 178, 95, 0.16); border: 1px solid rgba(233, 178, 95, 0.45); color: var(--gold2); font-size: 11px; padding: 2px 10px; border-radius: 999px; letter-spacing: 1px; }
.price-card__amount { display: flex; align-items: baseline; font-family: var(--serif); color: var(--gold2); font-size: 58px; font-weight: 600; line-height: 1; }
.price-card__currency { font-size: 24px; margin-right: 2px; }
.price-card__unit { margin-left: 8px; font-size: 13px; color: var(--mut); font-family: var(--sans); }
.price-card__compare { color: var(--mut); font-size: 13.5px; letter-spacing: 0.5px; }
.price-card__compare s { color: var(--dim); }
.price-card__note { color: var(--dim); font-size: 12.5px; line-height: 1.85; border-top: 1px dashed var(--line); padding-top: 14px; }
.price-card__detail { display: flex; flex-direction: column; gap: 18px; padding: 34px 36px; }
.price-card__title { font-family: var(--serif); font-size: 17px; letter-spacing: 2px; color: var(--ink); }
.price-card__list { gap: 10px; }
.price-card__actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: auto; padding-top: 12px; }
.note-line { margin-top: 18px; margin-bottom: 0; }
@media (max-width: 900px) {
  .price-card { grid-template-columns: 1fr; }
  .price-card__summary { border-right: 0; border-bottom: 1px solid var(--line); }
}
/* ---------- 授课安排 / 渠道合作页 ---------- */
.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.info-card { background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 22px 24px; display: flex; flex-direction: column; gap: 6px; }
.info-card__label { color: var(--gold); font-size: 11px; letter-spacing: 3px; font-weight: 600; }
.info-card__value { color: var(--ink); font-size: 14.5px; line-height: 1.8; font-weight: 500; }
.panel__text { color: var(--mut); font-size: 14.5px; line-height: 1.95; }
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step-item { background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 22px 20px; display: flex; flex-direction: column; gap: 8px; }
.step-item__no { color: var(--gold2); font-family: var(--serif); font-size: 21px; letter-spacing: 2px; line-height: 1; }
.step-item b { color: var(--ink); font-family: var(--serif); font-size: 16px; letter-spacing: 1px; }
.step-item span { color: var(--mut); font-size: 13px; line-height: 1.8; }
@media (max-width: 1023px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 599px) { .info-grid, .steps { grid-template-columns: 1fr; } }
/* ---------- 班型卡片（三大班型） ---------- */
.prog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.prog-card {
  --acc: var(--tone-indigo);
  position: relative; display: flex; flex-direction: column; gap: 16px;
  background: var(--card2); border: 1px solid var(--line); border-top: 2px solid var(--acc);
  border-radius: var(--radius-l); padding: 28px 26px 26px; overflow: hidden;
}
.prog-card__top { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.prog-card__no { font-family: var(--mono); font-weight: 600; color: var(--acc); font-size: 12px; letter-spacing: 3px; }
.prog-card h3 { font-family: var(--serif); font-size: 22px; font-weight: 600; letter-spacing: 1.5px; line-height: 1.4; }
.prog-card__desc { color: var(--mut); font-size: 13px; line-height: 1.85; margin-top: 10px; }
.badge--gold { background: var(--gold-grad); color: var(--gold-ink); font-weight: 600; }
.prog-card__price { border-top: 1px dashed var(--line); border-bottom: 1px dashed var(--line); padding: 16px 0; display: flex; flex-direction: column; gap: 4px; }
.prog-card__price-label { color: var(--gold2); font-size: 12px; letter-spacing: 3px; font-weight: 600; }
.prog-card__amount { display: flex; align-items: baseline; font-family: var(--serif); color: var(--gold2); font-size: 44px; font-weight: 600; line-height: 1.1; }
.prog-card__currency { font-size: 20px; margin-right: 2px; }
.prog-card__compare { color: var(--dim); font-size: 12.5px; }
.prog-card__compare s { color: var(--dim); }
.prog-card__meta-line { color: var(--mut); font-size: 13px; letter-spacing: 0.5px; }
.prog-card__label { color: var(--gold); font-size: 11px; letter-spacing: 3px; font-weight: 600; margin-bottom: 8px; }
.prog-card__features { gap: 8px; }
.prog-card__features li { font-size: 12.5px; line-height: 1.7; padding-left: 26px; }
.prog-card__features li::before { width: 17px; height: 17px; font-size: 10px; top: 2px; }
.prog-card__gifts { background: rgba(233, 178, 95, 0.05); border: 1px dashed rgba(233, 178, 95, 0.35); border-radius: 12px; padding: 14px 16px; }
.prog-card__gifts ul { display: grid; gap: 6px; }
.prog-gift { display: flex; flex-direction: column; gap: 1px; }
.prog-gift b { color: var(--ink); font-size: 13.5px; }
.prog-gift span { color: var(--gold2); font-size: 12px; }
.prog-card__gift-total { margin-top: 10px; color: var(--gold2); font-size: 12px; border-top: 1px dashed rgba(233, 178, 95, 0.25); padding-top: 8px; }
.prog-card__actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: auto; }
.prog-card__actions .btn { flex: 1; min-width: 150px; }
@media (max-width: 1023px) {
  .prog-grid { grid-template-columns: 1fr; max-width: 640px; margin-inline: auto; }
}.site-footer__org { color: var(--dim); font-size: 12.5px; letter-spacing: 1px; margin-top: 8px; }
/* ---------- 配图：班型封面 / Hero 主视觉 / 横幅 ---------- */
.prog-card__cover { margin: -28px -26px 16px; border-bottom: 1px solid var(--line-soft); }
.prog-card__cover img { display: block; width: 100%; height: 185px; object-fit: cover; }
.hero__inner { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.hero-art { margin: 0; }
.hero-art img {
  display: block; width: 100%; height: auto; max-height: 680px;
  object-fit: contain; border-radius: 16px;
  border: 1px solid rgba(233, 178, 95, 0.32);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.95), 0 0 70px -22px rgba(233, 178, 95, 0.28);
}
.band-art { width: 100%; max-height: 430px; object-fit: cover; border-radius: var(--radius-l); border: 1px solid var(--line); box-shadow: var(--shadow-m); }
.section--flush { padding-top: 0; }
@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; gap: 38px; }
  .hero-art { max-width: 620px; }
}
/* 四大班型：2 列布局 */
.prog-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 1060px; margin-inline: auto; }
@media (max-width: 1023px) {
  .prog-grid, .prog-grid--2 { grid-template-columns: 1fr; max-width: 640px; margin-inline: auto; }
}.lesson-points { display: grid; gap: 4px; margin-top: 8px; }
.lesson-points li { position: relative; padding-left: 16px; color: var(--mut); font-size: 13px; line-height: 1.75; }
.lesson-points li::before { content: "▸"; position: absolute; left: 0; color: var(--gold); }.req { color: var(--red); font-style: normal; }
.form__status { font-size: 13.5px; line-height: 1.8; padding: 10px 14px; border-radius: 10px; }
.form__status.is-ok { background: rgba(111, 227, 208, 0.1); color: var(--teal); border: 1px solid rgba(111, 227, 208, 0.35); }
.form__status.is-err { background: rgba(224, 90, 78, 0.1); color: #f2a19a; border: 1px solid rgba(224, 90, 78, 0.4); }
.form__hint--gold { color: var(--gold2); }
/* ---------- 讲师团队 ---------- */
.mentor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); gap: 18px; }
.mentor-card { display: flex; gap: 20px; align-items: flex-start; background: var(--card2); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 24px; }
.mentor-card__avatar { flex: 0 0 112px; width: 112px; height: 112px; border-radius: 16px; overflow: hidden; border: 1px solid rgba(233, 178, 95, 0.35); }
.mentor-card__avatar img { width: 100%; height: 100%; object-fit: cover; }
.mentor-card__body h3 { font-family: var(--serif); font-size: 19px; letter-spacing: 2px; color: var(--gold2); }
.mentor-card__title { margin-top: 4px; color: var(--ink); font-size: 13.5px; }
.mentor-card__roles { margin-top: 8px; display: grid; gap: 3px; }
.mentor-card__roles li { position: relative; padding-left: 14px; color: var(--mut); font-size: 12.5px; }
.mentor-card__roles li::before { content: "·"; position: absolute; left: 2px; color: var(--gold); }
.mentor-card__desc { margin-top: 8px; color: var(--mut); font-size: 12.5px; line-height: 1.85; }
.mentor-card__focus { margin-top: 10px; font-size: 12.5px; color: var(--mut); display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
.mentor-card__focus b { color: var(--gold2); font-weight: 600; border: 1px solid rgba(233, 178, 95, 0.4); padding: 2px 9px; border-radius: 999px; }
@media (max-width: 560px) {
  .mentor-card { flex-direction: column; }
  .mentor-card__avatar { width: 96px; height: 96px; }
}