/* ═══════════════════════════════════════════════════
   啡行咖技术学院 · CAFIATOR VI v2 (2026-09-03)
   深空蓝60 / 天际蓝20 / 航向金10 / 云母白10
   ═══════════════════════════════════════════════════ */
:root {
  --ink-900: #0A1628; --ink-800: #0F1F3A; --ink-700: #1E3A5F;
  --gold-500: #F5A623; --gold-300: #F5D78E;
  --paper: #F8F4E8;   --coffee: #C49A6C;
  --text-hi: #FFFFFF; --text-mid: #A8B8CC; --text-low: #7E8FA6;
  --radius-s: 8px; --radius-m: 12px; --radius-l: 16px;
  --e-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ───────── 首页板块 ───────── */
.academy {
  padding: var(--space-section, 100px) 0 72px;
  background: linear-gradient(180deg, rgba(10,22,40,0) 0%, rgba(15,31,58,0.5) 20%, rgba(15,31,58,0.5) 80%, rgba(10,22,40,0) 100%);
}
.academy .section-header { justify-content: center; text-align: center; }
.section-index {
  display: block;
  font-family: 'Montserrat', sans-serif;
  font-size: 13px; font-weight: 700;
  color: var(--gold-500); letter-spacing: 3px;
  margin-bottom: 6px;
}
.academy .section-header p { color: var(--text-mid); }
.hero-rule { width: 56px; height: 3px; margin: 0 auto 20px;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent); }

.academy-intro {
  max-width: 720px; margin: 28px auto 44px;
  text-align: center; color: var(--text-mid);
  font-size: 15px; line-height: 1.8;
}
.academy-grid {
  max-width: 860px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 14px;
}

/* 主题卡: 原生<details>, 零JS合CSP */
.academy-card {
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-l);
  background: var(--ink-800);
  overflow: hidden;
  transition: transform .35s var(--e-out), border-color .35s var(--e-out), background .35s var(--e-out);
}
.academy-card:hover {
  transform: translateY(-3px);
  border-color: rgba(245,166,35,0.25);
}
.academy-card[open] {
  border-color: rgba(245,166,35,0.35);
  transform: none;
}
.academy-card summary {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 24px; cursor: pointer; list-style: none; user-select: none;
}
.academy-card summary::-webkit-details-marker { display: none; }
.ac-num {
  font-family: 'Montserrat', sans-serif;
  font-size: 13px; font-weight: 700;
  color: var(--gold-500); letter-spacing: 2px;
  flex-shrink: 0;
}
.academy-card .ac-title {
  font-size: 15.5px; font-weight: 600; color: var(--text-hi); flex: 1;
}
.ac-arrow {
  color: var(--text-low); font-size: 12px; flex-shrink: 0;
  transition: transform .3s var(--e-out), color .3s var(--e-out);
}
.academy-card[open] .ac-arrow { transform: rotate(180deg); color: var(--gold-500); }
.ac-body {
  padding: 4px 24px 20px 24px;
  border-top: 1px solid rgba(255,255,255,0.05);
  margin-top: -1px;
}
.ac-body p {
  font-size: 14px; line-height: 1.85; color: #C9D4E4;
  margin: 14px 0; max-width: 72ch;
}
.ac-body strong { color: var(--gold-300); font-weight: 600; }
.ac-more { margin: 16px 0 0; }
.ac-more a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 24px;
  border: 1px solid rgba(245,166,35,0.35);
  color: var(--gold-500); font-size: 13px; font-weight: 600;
  letter-spacing: 1px; text-decoration: none;
  transition: background .25s var(--e-out), box-shadow .25s var(--e-out);
}
.ac-more a:hover {
  background: rgba(245,166,35,0.1);
  box-shadow: 0 4px 16px rgba(245,166,35,0.18);
}

/* ───────── 子页公共壳 ───────── */
body.academy-body {
  margin: 0; background: var(--ink-900); color: var(--text-hi);
  font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  line-height: 1.6; -webkit-font-smoothing: antialiased;
}
.top-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px; position: sticky; top: 0; z-index: 100;
  background: rgba(10,22,40,0.82);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid rgba(245,166,35,0.12);
}
.top-nav .brand {
  display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text-hi);
}
.brand-logo {
  width: 36px; height: 36px; border-radius: 9px;
  background: linear-gradient(135deg, var(--gold-500), #D4A017);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: var(--ink-900); font-size: 16px;
  font-family: 'Montserrat', sans-serif;
}
.brand b { font-size: 14px; letter-spacing: 1.5px; font-weight: 700; display: block; }
.brand span { font-size: 11px; color: var(--text-low); letter-spacing: 2px; }
.top-nav .nav-links { display: flex; gap: 4px; font-size: 13px; }
.top-nav .nav-links a {
  color: var(--text-mid); text-decoration: none; padding: 6px 14px; border-radius: 20px;
  transition: color .25s var(--e-out), background .25s var(--e-out);
}
.top-nav .nav-links a:hover { color: var(--gold-500); background: rgba(245,166,35,0.08); }

/* 文章页 */
.academy-page {
  max-width: 820px; margin: 0 auto; padding: 56px 28px 80px;
}
.crumbs {
  font-size: 12.5px; color: var(--text-low); margin-bottom: 28px; letter-spacing: 0.5px;
}
.crumbs a { color: var(--text-mid); text-decoration: none; }
.crumbs a:hover { color: var(--gold-500); }
.academy-page h1 {
  font-size: clamp(26px, 4vw, 36px); font-weight: 800; line-height: 1.3;
  margin: 0 0 18px; text-wrap: balance;
}
.academy-page h1 .ac-num {
  display: block; font-size: 13px; margin-bottom: 10px; letter-spacing: 3px;
}
.lead {
  font-size: 16px; color: var(--text-mid); line-height: 1.8;
  border-left: 3px solid var(--gold-500);
  padding: 4px 0 4px 20px; margin: 0 0 44px;
}
.academy-page h2 {
  display: flex; align-items: center; gap: 12px;
  font-size: 20px; font-weight: 700; margin: 52px 0 18px;
}
.academy-page h2::before {
  content: ''; width: 22px; height: 3px; background: var(--gold-500); flex-shrink: 0;
}
.academy-page p {
  font-size: 15px; line-height: 1.85; color: #C9D4E4; margin: 14px 0; max-width: 72ch;
}
.academy-page strong { color: var(--gold-300); font-weight: 600; }
.academy-page a { color: var(--gold-500); }

/* 数据图表 */
.datafig { margin: 26px 0; }
.datafig table {
  width: 100%; border-collapse: collapse; font-size: 13px;
  background: var(--ink-800); border-radius: var(--radius-m);
  border: 1px solid rgba(255,255,255,0.05);
  overflow: hidden;
}
.datafig th {
  text-align: left; padding: 12px 14px;
  color: var(--gold-500); font-weight: 600; font-size: 12px; letter-spacing: 1px;
  background: rgba(245,166,35,0.07);
  border-bottom: 1px solid rgba(245,166,35,0.15);
}
.datafig td {
  padding: 11px 14px; color: #C9D4E4;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.datafig tr:last-child td { border-bottom: none; }
.datafig tr:hover td { background: rgba(255,255,255,0.02); }
.datafig figcaption {
  margin-top: 10px; font-size: 12px; color: var(--text-low); text-align: center;
}
.datafig svg {
  width: 100%; height: auto; display: block;
  background: var(--ink-800); border-radius: var(--radius-m);
  border: 1px solid rgba(255,255,255,0.05);
}

/* 底部翻页 */
.ac-pager {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  margin-top: 56px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.05);
}
.ac-pager a {
  min-width: 44px; text-align: center; padding: 9px 12px;
  border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-s);
  color: var(--text-mid); text-decoration: none;
  font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 600;
  transition: all .25s var(--e-out);
}
.ac-pager a:hover { border-color: rgba(245,166,35,0.4); color: var(--gold-500); }
.ac-pager a.here {
  background: var(--gold-500); color: var(--ink-900);
  border-color: var(--gold-500); font-weight: 700;
}

/* 索引页 */
.academy-index { max-width: 1080px; margin: 0 auto; padding: 64px 28px 80px; }
.academy-index h1 {
  text-align: center; font-size: clamp(28px, 4.5vw, 40px); font-weight: 800; margin: 0 0 8px;
}
.academy-index h1 .ac-num {
  display: block; font-size: 13px; margin-bottom: 12px; letter-spacing: 4px;
}
.academy-index .lead {
  text-align: center; border-left: none; padding: 0; margin: 0 auto 56px; max-width: 640px;
}
.topic-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px;
}
.topic-card {
  position: relative; display: flex; flex-direction: column; gap: 10px;
  background: var(--ink-800); border-radius: var(--radius-l);
  border: 1px solid rgba(255,255,255,0.05);
  padding: 30px 28px 26px; text-decoration: none;
  transition: transform .35s var(--e-out), border-color .35s var(--e-out);
  overflow: hidden;
}
.topic-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--gold-500), var(--coffee), var(--gold-500));
  opacity: 0; transition: opacity .35s var(--e-out);
}
.topic-card:hover { transform: translateY(-4px); border-color: rgba(245,166,35,0.25); }
.topic-card:hover::before { opacity: 1; }
.tc-title { font-size: 16.5px; font-weight: 700; color: var(--text-hi); line-height: 1.5; }
.tc-desc { font-size: 13px; color: var(--text-low); line-height: 1.75; }
.topic-card .ac-num { letter-spacing: 2px; }

/* 子页 footer */
.academy-body footer {
  padding: 48px 32px 40px; text-align: center;
  border-top: 1px solid rgba(245,166,35,0.12);
  background: linear-gradient(180deg, var(--ink-900), #060D18);
  font-size: 12.5px; color: var(--text-low);
}
.academy-body footer a { color: var(--gold-500); text-decoration: none; }

/* 响应式 */
@media (max-width: 640px) {
  .top-nav { padding: 12px 18px; }
  .top-nav .nav-links { display: none; }
  .academy-page { padding: 36px 18px 64px; }
  .academy-index { padding: 44px 18px 64px; }
  .academy-card summary { padding: 16px 18px; gap: 12px; }
  .ac-body { padding: 4px 18px 18px; }
  .datafig table { font-size: 12px; }
  .datafig th, .datafig td { padding: 9px 10px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}