/* ============================================================
   AI应用人才双证培育基地 · 官网公共样式
   浅色主题 · 移动端优先 · 无外部依赖
   ============================================================ */
:root {
  --green: #187146;        /* 校徽绿（主色） */
  --green-deep: #0E4A2E;   /* 深绿（标题/页脚） */
  --green-light: #E7F2EC;  /* 浅绿底 */
  --red: #C8102E;          /* 校名红（强调/CTA） */
  --red-deep: #A00D26;
  --red-light: #FBEAEA;
  --ink: #1F1E1C;          /* 正文 */
  --ink-2: #55534E;        /* 次要文字 */
  --ink-3: #857F78;        /* 辅助文字 */
  --bg: #FAFAF7;           /* 页面底 */
  --surface: #FFFFFF;      /* 卡片面 */
  --line: #E6E3DC;         /* 边框 */
  --radius: 12px;
  --shadow: 0 1px 3px rgba(31, 30, 28, .06), 0 4px 14px rgba(31, 30, 28, .05);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 15px; line-height: 1.75; color: var(--ink);
  background: var(--bg);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { padding-left: 1.4em; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* 无障碍：跳转链接 / 焦点样式 */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--green); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 3px solid var(--red); outline-offset: 2px; border-radius: 4px; }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .2s;
}
.site-header.scrolled { box-shadow: 0 2px 12px rgba(31, 30, 28, .08); }
.header-inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand img { width: 168px; height: auto; }
.brand-text { line-height: 1.3; }
.brand-text strong { display: block; font-size: 17px; font-weight: 700; color: var(--green-deep); letter-spacing: .5px; }
.brand-text span { font-size: 11.5px; color: var(--ink-3); }
.site-nav { margin-left: auto; }
.site-nav > ul { display: flex; gap: 4px; list-style: none; padding: 0; }
.site-nav a {
  display: block; padding: 8px 12px; font-size: 14.5px; color: var(--ink);
  border-radius: 8px; white-space: nowrap;
}
.site-nav a:hover { background: var(--green-light); color: var(--green-deep); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--green-deep); font-weight: 700; background: var(--green-light); }
.site-nav .has-sub { position: relative; }
.site-nav .has-sub > a::after { content: ""; display: inline-block; margin-left: 6px; border: 4px solid transparent; border-top-color: currentColor; transform: translateY(2px); }
.site-nav .sub {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: var(--shadow); padding: 8px; list-style: none;
  opacity: 0; visibility: hidden; transform: translateY(6px); transition: .18s;
}
.site-nav .has-sub:hover .sub, .site-nav .has-sub:focus-within .sub { opacity: 1; visibility: visible; transform: none; }
.site-nav .sub a { font-size: 14px; padding: 8px 12px; }
.site-nav .sub a small { display: block; font-size: 11.5px; color: var(--ink-3); }
.header-cta { flex-shrink: 0; }
.nav-toggle {
  display: none; margin-left: auto; background: none; border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; cursor: pointer; font-size: 18px; line-height: 1;
  color: var(--green-deep);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 10px; font-size: 15.5px; font-weight: 700;
  border: 2px solid transparent; cursor: pointer; transition: .15s; text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-red { background: var(--red); color: #fff; }
.btn-red:hover { background: var(--red-deep); }
.btn-green { background: var(--green); color: #fff; }
.btn-green:hover { background: var(--green-deep); }
.btn-outline { background: #fff; color: var(--green-deep); border-color: var(--green); }
.btn-outline:hover { background: var(--green-light); }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(180deg, #F2F8F4 0%, var(--bg) 100%); padding: 56px 0 48px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; align-items: center; }
.hero .badge-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 5px 14px; font-size: 12.5px; color: var(--ink-2); font-weight: 500;
}
.badge.green { background: var(--green-light); border-color: #BFE0CF; color: var(--green-deep); }
.badge.red { background: var(--red-light); border-color: #F2C9CE; color: var(--red-deep); }
.hero h1 { font-size: 34px; line-height: 1.3; color: var(--green-deep); font-weight: 800; margin-bottom: 14px; }
.hero h1 .accent { color: var(--red); }
.hero .lead { font-size: 16.5px; color: var(--ink-2); margin-bottom: 10px; }
.hero .sub { font-size: 14px; color: var(--ink-3); margin-bottom: 26px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }
.hero-proof { display: flex; flex-wrap: wrap; gap: 22px; }
.hero-proof .num { font-size: 24px; font-weight: 800; color: var(--green); line-height: 1.2; }
.hero-proof .lab { font-size: 12.5px; color: var(--ink-3); }
.hero-figure { position: relative; }
.hero-figure img { border-radius: 16px; box-shadow: var(--shadow); width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.hero-figure figcaption {
  position: absolute; left: 14px; bottom: 14px; background: rgba(255, 255, 255, .94);
  padding: 6px 14px; border-radius: 8px; font-size: 12.5px; color: var(--green-deep); font-weight: 600;
}

/* ---------- 通用区块 ---------- */
.section { padding: 56px 0; }
.section.alt { background: #fff; border-block: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: 36px; }
.section-head.center { margin-inline: auto; text-align: center; }
.kicker {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px;
  color: var(--red); margin-bottom: 10px;
}
.section-head h2 { font-size: 27px; line-height: 1.35; color: var(--green-deep); font-weight: 800; margin-bottom: 12px; }
.section-head p { color: var(--ink-2); font-size: 15.5px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.card h3 { font-size: 18px; color: var(--green-deep); margin-bottom: 10px; font-weight: 700; }
.card p { color: var(--ink-2); font-size: 14.5px; }
.card .icon {
  width: 46px; height: 46px; border-radius: 10px; background: var(--green-light);
  display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 14px;
  color: var(--green);
}
.card-link { display: inline-block; margin-top: 12px; font-weight: 700; font-size: 14px; }
.card-link::after { content: " →"; }

/* ---------- 课程卡 ---------- */
.course-card { position: relative; overflow: hidden; display: flex; flex-direction: column; }
.course-card .tag {
  position: absolute; top: 0; right: 0; background: var(--green); color: #fff;
  font-size: 12px; font-weight: 700; padding: 5px 14px; border-radius: 0 0 0 10px;
}
.course-card .tag.b { background: var(--red); }
.course-card h3 { font-size: 20px; padding-right: 90px; }
.course-card .meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 14px; }
.course-card .meta span { background: var(--green-light); color: var(--green-deep); font-size: 12.5px; padding: 3px 10px; border-radius: 6px; font-weight: 600; }
.course-card ul { margin: 0 0 18px; color: var(--ink-2); font-size: 14px; }
.course-card ul li { margin-bottom: 6px; }
.course-card .price-row { margin-top: auto; display: flex; align-items: baseline; gap: 10px; padding-top: 14px; border-top: 1px dashed var(--line); }
.course-card .price { font-size: 26px; font-weight: 800; color: var(--red); }
.course-card .price small { font-size: 13px; font-weight: 500; color: var(--ink-3); }
.course-card .price-note { font-size: 12.5px; color: var(--ink-3); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 640px; }
th, td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--green-light); color: var(--green-deep); font-weight: 700; white-space: nowrap; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #FAFBF8; }
td .em { color: var(--red); font-weight: 700; }

/* ---------- 步骤 / 时间线 ---------- */
.steps { counter-reset: step; display: grid; gap: 18px; grid-template-columns: repeat(4, 1fr); }
.step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; position: relative; }
.step::before {
  counter-increment: step; content: counter(step);
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%; background: var(--green); color: #fff;
  font-weight: 800; margin-bottom: 12px;
}
.step h3 { font-size: 16px; color: var(--green-deep); margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--ink-2); }

/* ---------- 校园相册 ---------- */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.gallery figure { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff; }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .35s; }
.gallery figure:hover img { transform: scale(1.04); }
.gallery figcaption { font-size: 12.5px; color: var(--ink-2); padding: 9px 12px; font-weight: 600; }
.gallery figure.wide { grid-column: span 2; }
.gallery figure.wide img { aspect-ratio: 16 / 9; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin-inline: auto; }
.faq-list details {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 12px; overflow: hidden;
}
.faq-list summary {
  cursor: pointer; list-style: none; padding: 16px 20px; font-weight: 700; font-size: 15.5px;
  color: var(--green-deep); display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+"; flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
  background: var(--green-light); color: var(--green-deep);
  display: flex; align-items: center; justify-content: center; font-size: 17px; font-weight: 700;
}
.faq-list details[open] summary::after { content: "−"; }
.faq-list details .answer { padding: 0 20px 18px; color: var(--ink-2); font-size: 14.5px; }
.faq-cat { font-size: 18px; color: var(--green-deep); margin: 30px 0 14px; font-weight: 800; }

/* ---------- 表单 ---------- */
.enroll-layout { display: grid; grid-template-columns: 1fr 1.15fr; gap: 34px; align-items: start; }
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 700; font-size: 14px; margin-bottom: 6px; color: var(--ink); }
.field label .req { color: var(--red); margin-left: 2px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--line); border-radius: 9px;
  font-size: 15px; font-family: var(--font); background: #fff; color: var(--ink);
  transition: border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--green); outline: none; }
.field .hint { font-size: 12.5px; color: var(--ink-3); margin-top: 5px; }
.field .err { display: none; font-size: 12.5px; color: var(--red); margin-top: 5px; font-weight: 600; }
.field.invalid input, .field.invalid select { border-color: var(--red); }
.field.invalid .err { display: block; }
.radio-row { display: flex; flex-wrap: wrap; gap: 10px; }
.radio-pill {
  flex: 1 1 45%; border: 1.5px solid var(--line); border-radius: 10px; padding: 12px 14px;
  cursor: pointer; display: flex; gap: 10px; align-items: flex-start; font-size: 14px; background: #fff;
}
.radio-pill:has(input:checked) { border-color: var(--green); background: var(--green-light); }
.radio-pill input { margin-top: 4px; accent-color: var(--green); }
.radio-pill small { display: block; color: var(--ink-3); font-size: 12px; }
.form-note { font-size: 12.5px; color: var(--ink-3); margin-top: 14px; }
.form-success {
  display: none; background: var(--green-light); border: 1px solid #BFE0CF;
  border-radius: var(--radius); padding: 22px; color: var(--green-deep);
}
.form-success.show { display: block; }

/* ---------- 提示框 ---------- */
.notice {
  border-left: 4px solid var(--red); background: var(--red-light);
  border-radius: 0 10px 10px 0; padding: 16px 20px; font-size: 13.5px; color: #6B1220; margin: 22px 0;
}
.notice.green { border-left-color: var(--green); background: var(--green-light); color: var(--green-deep); }
.notice strong { display: block; margin-bottom: 4px; }

/* ---------- 面包屑 ---------- */
.crumbs { font-size: 13px; color: var(--ink-3); padding: 18px 0 0; }
.crumbs a { color: var(--ink-2); }
.crumbs .sep { margin: 0 7px; color: #C9C5BC; }
.crumbs [aria-current] { color: var(--green-deep); font-weight: 600; }

/* ---------- 页头大标题（子页） ---------- */
.page-hero { background: linear-gradient(180deg, #F2F8F4, var(--bg)); padding: 34px 0 40px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: 30px; color: var(--green-deep); font-weight: 800; line-height: 1.3; }
.page-hero p { color: var(--ink-2); margin-top: 10px; max-width: 760px; font-size: 15.5px; }

/* ---------- 内容排版 ---------- */
.prose h2 { font-size: 23px; color: var(--green-deep); margin: 38px 0 14px; font-weight: 800; }
.prose h3 { font-size: 17.5px; color: var(--green-deep); margin: 26px 0 10px; font-weight: 700; }
.prose p { color: var(--ink-2); margin-bottom: 14px; }
.prose ul, .prose ol { color: var(--ink-2); margin-bottom: 16px; }
.prose li { margin-bottom: 7px; }
.prose strong { color: var(--ink); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--green-deep), var(--green));
  border-radius: 18px; padding: 46px; color: #fff; text-align: center;
}
.cta-band h2 { font-size: 26px; font-weight: 800; margin-bottom: 12px; }
.cta-band p { opacity: .92; margin-bottom: 24px; font-size: 15.5px; }
.cta-band .btn-red { background: #fff; color: var(--red-deep); }
.cta-band .btn-red:hover { background: #FFEAEA; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--green-deep); color: #D8E8DF; margin-top: 20px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px; padding: 52px 0 36px; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; font-weight: 700; }
.site-footer ul { list-style: none; padding: 0; }
.site-footer li { margin-bottom: 9px; font-size: 13.5px; }
.site-footer a { color: #D8E8DF; }
.site-footer a:hover { color: #fff; }
.footer-brand img { width: 190px; margin-bottom: 14px; background: #fff; padding: 8px 12px; border-radius: 8px; }
.footer-brand p { font-size: 13px; line-height: 1.7; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .16); padding: 18px 0 26px;
  font-size: 12.5px; color: #A9C6B6; display: flex; flex-wrap: wrap; gap: 8px 26px;
}
.footer-bottom .disclaimer { flex-basis: 100%; color: #93B5A2; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-figure { order: -1; }
  .grid-4, .steps { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .gallery figure.wide { grid-column: span 2; }
  .enroll-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 14.5px; }
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute; top: 68px; left: 0; right: 0; background: #fff;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
    display: none; padding: 10px 20px 18px; margin: 0;
  }
  .site-nav.open { display: block; }
  .site-nav > ul { flex-direction: column; gap: 2px; }
  .site-nav .sub { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding: 0 0 6px 16px; display: none; }
  .site-nav .has-sub:hover .sub, .site-nav .has-sub:focus-within .sub, .site-nav .has-sub.open .sub { display: block; }
  .header-cta { display: none; }
  .brand img { width: 138px; }
  .brand-text strong { font-size: 15px; }
  .hero { padding: 36px 0; }
  .hero h1 { font-size: 27px; }
  .section { padding: 42px 0; }
  .section-head h2 { font-size: 23px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .grid-4, .steps { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .gallery figure.wide { grid-column: span 1; }
  .cta-band { padding: 32px 22px; }
  .radio-pill { flex-basis: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}