/* ===== 课程详情页样式（复用 style.css 的设计变量与基础类）===== */

body { padding-bottom: 92px; }

/* 面包屑 */
.crumb {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--muted);
}
.crumb .container { padding: 12px 24px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.crumb a { color: var(--ink-soft); }
.crumb a:hover { color: var(--pku-red); }
.crumb span { color: #C9C2B5; }
.crumb em { font-style: normal; color: var(--ink); }

/* 首屏 */
.course-hero {
  background:
    radial-gradient(900px 380px at 12% -10%, rgba(200,16,46,.34), transparent 62%),
    linear-gradient(160deg, #201C19 0%, #2A211C 55%, #1C1A18 100%);
  color: #fff;
  padding: 64px 0 56px;
  position: relative;
  overflow: hidden;
}
.course-hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}
.course-hero .container { position: relative; z-index: 1; }
.course-hero h1 {
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.3;
  margin: 16px 0 14px;
  letter-spacing: .5px;
}
.course-hero .course-tag { background: rgba(255,255,255,.12); color: #F1D9A8; }
.hero-sub { color: #D8D2C8; font-size: 16px; max-width: 760px; line-height: 1.85; }
.hero-facts {
  list-style: none; display: flex; flex-wrap: wrap; gap: 14px 40px;
  margin: 28px 0 30px; padding: 22px 0 0; border-top: 1px solid rgba(255,255,255,.14);
}
.hero-facts li { display: flex; flex-direction: column; gap: 6px; }
.hero-facts em { font-style: normal; font-size: 12.5px; color: #A79E90; letter-spacing: .5px; }
.hero-facts strong { font-size: 16px; color: #fff; font-weight: 600; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-btns .btn { border: 1px solid transparent; }
.hero-btns .btn-primary { border-color: var(--pku-red); }

/* 区块 */
.sec { padding: 64px 0; }
.sec.alt { background: var(--bg-alt); }
.narrow { max-width: 900px; }
.sec h2 {
  font-family: var(--serif);
  font-size: clamp(21px, 2.2vw, 26px);
  margin: 0 0 18px;
  position: relative;
  padding-left: 14px;
}
.sec h2::before {
  content: ""; position: absolute; left: 0; top: 6px; bottom: 6px; width: 3px;
  background: var(--pku-red); border-radius: 2px;
}
.sub-h { font-size: 17px; margin: 30px 0 14px; font-family: var(--serif); }
.sec-lead { color: var(--muted); font-size: 14.5px; margin: -6px 0 22px; }
.prose { color: var(--ink-soft); font-size: 15.5px; line-height: 2; margin: 0 0 14px; }

/* 学习收益 */
.benefit-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 26px; padding: 0; }
.benefit-list li {
  position: relative; padding-left: 26px; font-size: 15px; color: var(--ink-soft); line-height: 1.8;
}
.benefit-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--pku-red); font-weight: 700;
}

/* 课程模块 */
.module-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.module-list li {
  display: flex; gap: 18px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 22px;
}
.mod-no {
  font-family: var(--serif); font-size: 20px; color: var(--pku-gold);
  min-width: 34px; line-height: 1.2;
}
.module-list h3 { font-size: 16px; margin: 0 0 6px; font-weight: 600; }
.module-list p { margin: 0; font-size: 14.5px; color: var(--ink-soft); line-height: 1.8; }

/* 两栏 */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
.info-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.info-table th, .info-table td { text-align: left; padding: 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.info-table th { width: 92px; color: var(--muted); font-weight: 500; }
.info-table td { color: var(--ink-soft); }
.price { color: var(--pku-red); font-size: 18px; font-family: var(--serif); }

/* 师资 */
.t-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.t-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; text-align: center;
}
.t-photo {
  width: 96px; height: 96px; border-radius: 50%; overflow: hidden; margin: 0 auto 14px;
  background: linear-gradient(135deg, #C8102E, #9E0C24);
}
.t-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.t-card h3 { font-size: 16px; margin: 0 0 4px; }
.t-card span { font-size: 12.5px; color: var(--muted); display: block; margin-bottom: 10px; }
.t-card p { font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; margin: 0; }

/* 流程 */
.steps { list-style: none; counter-reset: s; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.steps li {
  counter-increment: s; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; position: relative;
}
.steps li::before {
  content: counter(s); position: absolute; top: 14px; right: 16px;
  font-family: var(--serif); font-size: 26px; color: rgba(200,16,46,.14); font-weight: 700;
}
.steps strong { display: block; font-size: 15px; margin-bottom: 8px; }
.steps span { font-size: 13.5px; color: var(--ink-soft); line-height: 1.7; }

/* FAQ */
.faq { display: grid; gap: 10px; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px;
}
.faq-item summary {
  cursor: pointer; font-size: 15.5px; font-weight: 600; color: var(--ink); list-style: none;
  position: relative; padding-right: 24px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 0; top: -2px; color: var(--pku-red); font-size: 20px;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p { margin: 12px 0 0; font-size: 14.5px; color: var(--ink-soft); line-height: 1.9; }

/* 相关课程 */
.rel-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.rel-card {
  display: flex; flex-direction: column; gap: 8px;
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
  background: #fff; transition: .25s;
}
.rel-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); border-color: #DED6C8; }
.rel-card strong { font-size: 14.5px; line-height: 1.55; }
.rel-card em { font-style: normal; font-size: 12.5px; color: var(--muted); }
.more-link { margin-top: 22px; font-size: 14.5px; }
.more-link a { color: var(--pku-red); }

/* 课程总览卡片 */
.c-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.c-card {
  display: flex; flex-direction: column; gap: 8px;
  border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
  background: #fff; transition: .25s;
}
.c-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); border-color: #DED6C8; }
.c-card h3 { font-family: var(--serif); font-size: 16.5px; line-height: 1.5; margin: 2px 0 4px; }
.c-desc { font-size: 13.5px; color: var(--ink-soft); line-height: 1.75; margin: 0; }
.c-meta { display: flex; gap: 14px; font-size: 12.5px; color: var(--muted); margin-top: auto; padding-top: 10px; }
.c-meta span:first-child { color: var(--pku-red); font-weight: 600; }
.c-more { font-style: normal; font-size: 13px; color: var(--pku-red); }

/* 底部咨询条 */
.cta-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
  background: rgba(28,26,24,.96);
  backdrop-filter: blur(8px);
  border-top: 1px solid rgba(255,255,255,.12);
  color: #fff;
}
.cta-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.cta-text { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.cta-text strong { font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cta-text span { font-size: 12.5px; color: #B7AFA2; }
.cta-actions { display: flex; gap: 10px; flex-shrink: 0; }
.cta-actions .btn { padding: 10px 18px; font-size: 14px; }

/* 响应式 */
@media (max-width: 980px) {
  .two-col { grid-template-columns: 1fr; gap: 32px; }
  .t-grid, .c-grid, .rel-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .course-hero { padding: 48px 0 42px; }
}
@media (max-width: 640px) {
  body { padding-bottom: 108px; }
  .benefit-list { grid-template-columns: 1fr; }
  .t-grid, .c-grid, .rel-grid, .steps { grid-template-columns: 1fr; }
  .sec { padding: 44px 0; }
  .hero-facts { gap: 14px 26px; }
  .cta-inner { flex-direction: column; align-items: stretch; gap: 10px; padding: 12px 16px; }
  .cta-text strong { font-size: 14px; }
  .cta-actions .btn { flex: 1; text-align: center; }
  .nav-links { display: none; }
}

/* ===== 招生问答页 ===== */
.faq-layout { display: grid; grid-template-columns: 258px 1fr; gap: 46px; align-items: start; }
.faq-side { position: sticky; top: 92px; display: grid; gap: 16px; }
.faq-nav {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; padding: 6px 18px 10px;
}
.faq-nav strong {
  display: block; font-size: 14px; padding: 14px 0 10px;
  border-bottom: 1px solid var(--line); margin-bottom: 2px;
}
.faq-nav a {
  display: block; font-size: 14px; color: var(--ink-soft);
  padding: 9px 0; border-bottom: 1px dashed var(--line); line-height: 1.6;
}
.faq-nav a:last-child { border-bottom: 0; }
.faq-nav a:hover { color: var(--pku-red); }

.faq-ask {
  background: linear-gradient(160deg, #221E1B 0%, #2B211C 100%);
  color: #fff; border-radius: var(--radius); padding: 22px 20px;
}
.faq-ask strong { font-family: var(--serif); font-size: 16px; display: block; margin-bottom: 8px; }
.faq-ask p { font-size: 13px; color: #B7AFA2; line-height: 1.75; margin: 0 0 12px; }
.faq-ask-tel {
  display: block; font-family: var(--serif); font-size: 21px;
  color: #F1D9A8; letter-spacing: .5px; margin-bottom: 4px;
}
.faq-ask span { font-size: 12px; color: #8F877A; }

.faq-cat { margin-bottom: 48px; scroll-margin-top: 92px; }
.faq-cat h2, .faq-end h2 {
  font-family: var(--serif); font-size: clamp(20px, 2vw, 24px);
  margin: 0 0 10px; position: relative; padding-left: 14px;
}
.faq-cat h2::before, .faq-end h2::before {
  content: ""; position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 3px; background: var(--pku-red); border-radius: 2px;
}
.faq-count {
  font-size: 12.5px; color: var(--muted); font-weight: 400;
  margin-left: 10px; font-family: var(--sans);
}
.faq .faq-item { padding: 18px 22px; }
.faq .faq-item summary { font-size: 16px; line-height: 1.65; }
.faq .faq-item p { font-size: 14.5px; }
.faq .faq-item p a { color: var(--pku-red); }
.faq .faq-item p strong { color: var(--ink); }

.faq-end {
  background: var(--bg-alt); border-radius: var(--radius);
  padding: 34px 32px; margin-top: 8px;
}
.faq-end p { font-size: 14.5px; color: var(--ink-soft); line-height: 1.9; margin: 0 0 18px; }
.faq-end-btns { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; }
.faq-end-note { font-size: 13px !important; color: var(--muted) !important; margin: 0 !important; }

@media (max-width: 980px) {
  .faq-layout { grid-template-columns: 1fr; gap: 36px; }
  .faq-side { position: static; grid-template-columns: 1fr 1fr; align-items: start; }
  .faq-side .faq-nav:last-child { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .faq-side { grid-template-columns: 1fr; }
  .faq-cat { margin-bottom: 36px; }
  .faq-end { padding: 26px 20px; }
}