/* =============================================================
 * style.css — 布局与组件（头部/导航/Hero/卡片/按钮/表单/页脚/响应式）
 * 主题：佳径青藤（AI 蓝 + 青）
 * 依赖：base.css（变量与 reset）
 * ============================================================= */

/* ---------- 1. 头部 / 导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-header .logo img {
  height: 40px;
  width: auto;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.main-nav a:hover {
  color: var(--ai-blue);
  background: rgba(37, 99, 235, 0.06);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  font-size: 24px;
  line-height: 1;
  color: var(--text);
  border-radius: 8px;
}

.nav-toggle:hover { background: rgba(37, 99, 235, 0.06); }

/* ---------- 2. 按钮 ---------- */
.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  white-space: nowrap;
}

.btn-primary {
  color: #fff;
  background: var(--gradient);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(37, 99, 235, 0.28);
}

.btn-ghost {
  color: var(--ai-blue);
  border: 1.5px solid var(--ai-blue);
  background: transparent;
}

.btn-ghost:hover {
  color: #fff;
  background: var(--gradient);
  border-color: transparent;
}

/* ---------- 3. Hero 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 80px;
  background: linear-gradient(180deg, #EFF6FF 0%, var(--bg) 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.9;
  pointer-events: none;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero__title {
  font-size: clamp(30px, 4.5vw, 48px);
  line-height: 1.25;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  margin-top: 18px;
  font-size: 17px;
  color: var(--text-sub);
}

.hero__subtitle strong {
  color: var(--ai-blue);
}

.hero__cta {
  margin-top: 30px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 轮播 */
.carousel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 6;
  background: var(--card);
}

.carousel__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.6s ease;
}

.carousel__slide.is-active {
  opacity: 1;
  z-index: 1;
}

.carousel__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
  color: var(--ai-blue);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.carousel__btn:hover { background: #fff; }
.carousel__btn--prev { left: 12px; }
.carousel__btn--next { right: 12px; }

.carousel__dots {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  gap: 8px;
}

.carousel__dots button {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
}

.carousel__dots button.is-active { background: #fff; }

/* ---------- 4. 数据卡 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 18px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.stat-card__num {
  font-size: 30px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-card__label {
  margin-top: 6px;
  color: var(--text-sub);
  font-size: 14px;
}

/* ---------- 5. 业务双入口 ---------- */
.entry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.entry-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  color: #fff;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}

.entry-card:hover { transform: translateY(-4px); }
.entry-card--course { background: linear-gradient(135deg, #2563EB, #4F46E5); }
.entry-card--mentor { background: linear-gradient(135deg, #06B6D4, #0EA5E9); }

.entry-card h3 { color: #fff; font-size: 24px; }
.entry-card p { color: rgba(255, 255, 255, 0.85); margin: 10px 0 18px; }
.entry-card .btn-ghost { align-self: flex-start; color: #fff; border-color: rgba(255, 255, 255, 0.8); }
.entry-card .btn-ghost:hover { background: rgba(255, 255, 255, 0.95); color: var(--ai-blue); }

/* ---------- 6. 卡片（通用） ---------- */
.card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(37, 99, 235, 0.4);
}

.card__media {
  position: relative;
  aspect-ratio: 3 / 2;
  background: #EEF2FF;
  overflow: hidden;
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card__body {
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.card__title {
  font-size: 17px;
  font-weight: 700;
}

.card__meta {
  font-size: 13px;
  color: var(--text-sub);
}

/* 标签 */
.tag {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  color: var(--ai-blue);
  background: rgba(37, 99, 235, 0.1);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-list .tag {
  background: rgba(6, 182, 212, 0.12);
  color: var(--cyan);
}

/* 价格 */
.price {
  margin-top: auto;
  font-size: 18px;
  font-weight: 800;
  color: var(--ai-blue);
}

/* ---------- 7. 三栏卡片（自主研发体系） ---------- */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pillar {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.pillar:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.pillar__icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.pillar__icon svg { width: 28px; height: 28px; stroke: #fff; }
.pillar h3 { margin-bottom: 10px; }
.pillar p { font-size: 14px; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  padding: 16px 0;
  font-size: 13px;
  color: var(--text-sub);
}
.breadcrumb a:hover { color: var(--ai-blue); }
.breadcrumb span { margin: 0 8px; }

/* ---------- 9. 详情页 ---------- */
.detail {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 28px;
}

.detail__hero {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
  background: #EEF2FF;
}

.detail h1 { margin-bottom: 16px; }

.detail h2 {
  margin: 32px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--ai-blue);
}

.detail__content {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.9;
}

.detail__content img { max-width: 100%; border-radius: var(--radius); margin: 12px 0; }

/* 信息卡 */
.info-card {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.info-card__item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.info-card__item .label {
  display: block;
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 4px;
}

.info-card__item .value {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

/* 相关推荐 */
.related {
  margin-top: 36px;
}
.related__list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* CTA 块 */
.cta-block {
  margin-top: 28px;
  padding: 26px;
  border-radius: var(--radius);
  background: rgba(37, 99, 235, 0.06);
  border: 1px dashed rgba(37, 99, 235, 0.4);
  text-align: center;
}
.cta-block p { margin-bottom: 14px; }
.cta-block .note { font-size: 13px; color: var(--text-sub); margin-top: 8px; }

/* ---------- 10. 表单（留言 / 报名 / 预约） ---------- */
.form-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  max-width: 640px;
}

.form-row {
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.form-row label .req { color: #EF4444; margin-left: 2px; }

.form-control {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--ai-blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

textarea.form-control { resize: vertical; min-height: 120px; }

.form-tip {
  font-size: 13px;
  color: var(--text-sub);
}

.form-msg {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  display: none;
}
.form-msg.is-error { display: block; background: #FEF2F2; color: #B91C1C; }
.form-msg.is-ok { display: block; background: #ECFDF5; color: #047857; }

/* ---------- 11. 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.map-placeholder {
  height: 320px;
  border-radius: var(--radius-lg);
  background:
    repeating-linear-gradient(45deg, #E2E8F0 0 12px, #EDF2F7 12px 24px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-sub);
  font-size: 15px;
  border: 1px solid var(--border);
}

.contact-info { margin-top: 20px; }
.contact-info li {
  display: flex;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}
.contact-info li strong { color: var(--text); min-width: 64px; }

/* ---------- 12. 列表页头部 ---------- */
.page-head {
  background: linear-gradient(135deg, #EFF6FF, #ECFEFF);
  padding: 48px 0;
  text-align: center;
}
.page-head h1 { background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-head p { margin-top: 10px; }

/* 班型 Tab（仅视觉分组，非前端筛选） */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin: 24px 0 8px;
}
.filter-tabs .tab {
  padding: 7px 18px;
  border-radius: 999px;
  font-size: 14px;
  border: 1px solid var(--border);
  color: var(--text-sub);
  background: #fff;
}
.filter-tabs .tab.is-active { color: #fff; background: var(--gradient); border-color: transparent; }

/* ---------- 13. 搜索 ---------- */
.search-bar {
  display: flex;
  gap: 10px;
  max-width: 560px;
  margin: 0 auto 28px;
}
.search-bar input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
}
.search-bar input:focus { outline: none; border-color: var(--ai-blue); }
.search-result {
  display: block;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}
.search-result:hover { background: var(--bg); }
.search-result h3 { font-size: 16px; }
.search-result p { font-size: 14px; margin-top: 4px; }
.search-empty { text-align: center; color: var(--text-sub); padding: 40px 0; }

/* ---------- 14. 分页 ---------- */
.pagebar {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 36px 0;
  flex-wrap: wrap;
}
.pagebar a,
.pagebar span {
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
}
.pagebar a:hover { color: #fff; background: var(--gradient); border-color: transparent; }
.pagebar .active { color: #fff; background: var(--gradient); border-color: transparent; }

/* ---------- 15. 页脚 ---------- */
.site-footer {
  margin-top: 64px;
  background: #0F172A;
  color: #CBD5E1;
  padding: 48px 0 24px;
}
.site-footer a { color: #CBD5E1; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
}
.footer-grid h4 { color: #fff; margin-bottom: 14px; font-size: 16px; }
.footer-grid p { color: #94A3B8; font-size: 14px; }
.footer-nav li { padding: 5px 0; }
.footer-nav a { font-size: 14px; }
.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  font-size: 13px;
  color: #64748B;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 992px) {
  .hero .container { grid-template-columns: 1fr; }
  .carousel { aspect-ratio: 16 / 9; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .pillar-grid { grid-template-columns: 1fr; }
  .info-card { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .related__list { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 44px 0; }

  .nav-toggle { display: flex; align-items: center; justify-content: center; }

  .main-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .main-nav.open { max-height: 420px; }
  .main-nav ul { flex-direction: column; align-items: stretch; padding: 8px 16px; gap: 2px; }
  .main-nav a { padding: 12px 14px; border-radius: 8px; }

  .entry-grid { grid-template-columns: 1fr; }
  .grid--3 > *, .grid--4 > *, .grid--2 > * { grid-column: span 12; }
  .grid { gap: 18px; }

  .contact-grid { gap: 24px; }
  .related__list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }

  .detail { padding: 22px; }
  .form-card { padding: 22px; }
}

@media (max-width: 480px) {
  .stats { grid-template-columns: 1fr; }
  .info-card { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
  .hero__cta { flex-direction: column; }
  .hero__cta .btn-primary, .hero__cta .btn-ghost { width: 100%; }
}