/* =========================================================
   饿龙口腔考研 官网 · 样式 v2
   设计方向：高端、简洁 —— 编辑感留白、深松绿、细线
   ========================================================= */

:root {
  --paper: #faf9f6;
  --paper-2: #f3f1ea;
  --ink: #1d1c19;
  --ink-2: #57554d;
  --ink-3: #96938a;
  --pine: #153a2d;
  --pine-deep: #0c2a20;
  --pine-soft: #e7ece5;
  --brass: #a8875a;
  --line: #e4e1d6;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun",
    "Times New Roman", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink-2);
  background: var(--paper);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--pine); color: #fff; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.section { padding: 96px 0; }
.section-alt { background: var(--paper-2); }

/* ===== 导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 600; font-size: 19px; color: var(--ink); font-family: var(--font-serif); letter-spacing: .06em; }
.brand-logo {
  width: 34px; height: 34px; border-radius: 6px;
  background: var(--pine); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 17px; font-family: var(--font-serif);
}
.nav-links { display: flex; gap: 34px; }
.nav-links a { color: var(--ink-2); font-size: 14px; letter-spacing: .04em; transition: color .2s; }
.nav-links a:hover { color: var(--pine); }

.nav-toggle {
  display: none; border: none; background: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 6px;
}
.nav-toggle span { width: 22px; height: 1.5px; background: var(--ink); border-radius: 2px; transition: .25s; }
.nav.open .nav-toggle span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav.open .nav-toggle span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ===== 首屏 ===== */
.hero { padding: 92px 0 68px; text-align: center; }
.hero-badge {
  display: inline-block; padding: 8px 22px; border: 1px solid var(--line); border-radius: 999px;
  color: var(--pine); background: transparent;
  font-size: 13px; letter-spacing: .18em; margin-bottom: 34px;
}
.hero h1 {
  font-family: var(--font-serif); font-weight: 600; color: var(--ink);
  font-size: 60px; letter-spacing: .10em; line-height: 1.3; margin-bottom: 26px;
}
.hero-divider { width: 44px; height: 1px; background: var(--pine); margin: 0 auto 30px; }
.hero-sub { font-size: 16px; color: var(--ink-2); line-height: 2.1; letter-spacing: .04em; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 46px; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.stat { padding: 26px 12px; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat strong { display: block; font-family: var(--font-serif); font-size: 30px; color: var(--pine); font-weight: 600; letter-spacing: .03em; }
.stat span { font-size: 12.5px; color: var(--ink-3); letter-spacing: .05em; }

/* ===== 按钮 ===== */
.btn {
  display: inline-block; padding: 14px 38px; border: 1px solid var(--ink);
  border-radius: 2px; font-size: 14px; letter-spacing: .12em; transition: all .25s;
}
.btn-primary { background: var(--pine); border-color: var(--pine); color: #fff; }
.btn-primary:hover { background: var(--pine-deep); border-color: var(--pine-deep); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-outline { background: transparent; color: var(--pine); border-color: var(--pine); }
.btn-outline:hover { background: var(--pine); color: #fff; }

/* ===== 通用标题 ===== */
.section-eyebrow {
  display: inline-flex; align-items: center; gap: 16px;
  font-family: var(--font-serif); font-size: 13px; letter-spacing: .30em;
  color: var(--brass); margin-bottom: 20px;
}
.section-eyebrow::before, .section-eyebrow::after {
  content: ""; width: 30px; height: 1px; background: var(--line);
}
.section-title {
  font-family: var(--font-serif); font-size: 36px; font-weight: 600;
  color: var(--ink); letter-spacing: .06em; line-height: 1.45; margin-bottom: 16px;
}
.section-desc { font-size: 15px; color: var(--ink-3); margin: 0 0 52px; }

/* ===== 品牌介绍 ===== */
.brand-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 44px; }
.brand-card { border-top: 1px solid var(--line); padding-top: 26px; transition: border-color .25s; }
.brand-card:hover { border-top-color: var(--pine); }
.brand-card h3 { font-family: var(--font-serif); font-size: 20px; color: var(--ink); margin-bottom: 12px; letter-spacing: .04em; }
.brand-card p { font-size: 14px; color: var(--ink-2); }

/* ===== 课程 ===== */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; align-items: stretch; }
.course-card {
  border: 1px solid var(--line); background: var(--paper);
  padding: 46px 40px; display: flex; flex-direction: column;
}
@media (min-width: 981px) { .course-card + .course-card { border-left: none; } }
.course-tag {
  display: inline-block; font-size: 12px; letter-spacing: .14em; color: var(--pine);
  border: 1px solid var(--line); border-radius: 999px; padding: 5px 15px; margin-bottom: 24px;
}
.course-card h3 { font-family: var(--font-serif); font-size: 24px; color: var(--ink); letter-spacing: .04em; }
.course-price { margin: 18px 0 24px; display: flex; flex-direction: column; gap: 4px; }
.course-price strong { font-family: var(--font-serif); font-size: 34px; color: var(--pine); font-weight: 600; letter-spacing: .02em; }
.course-price span { font-size: 12.5px; color: var(--ink-3); }
.course-card ul { margin-bottom: 30px; display: grid; gap: 12px; flex: 1; }
.course-card ul li { font-size: 14px; line-height: 1.95; color: var(--ink-2); padding-left: 18px; position: relative; }
.course-card ul li::before { content: ""; position: absolute; left: 0; top: 11px; width: 6px; height: 1px; background: var(--brass); }

/* 主推班型：深松绿底 */
.course-card.course-hot { background: var(--pine); border-color: var(--pine); }
.course-card.course-hot .course-tag { color: var(--brass); border-color: rgba(255, 255, 255, .32); }
.course-card.course-hot h3 { color: #fff; }
.course-card.course-hot .course-price strong { color: #fff; }
.course-card.course-hot .course-price span { color: rgba(255, 255, 255, .72); }
.course-card.course-hot ul li { color: rgba(255, 255, 255, .86); }
.course-card.course-hot ul li::before { background: var(--brass); }
.course-card.course-hot .btn-primary { background: #fff; border-color: #fff; color: var(--pine); }
.course-card.course-hot .btn-primary:hover { background: rgba(255, 255, 255, .9); }

.course-note {
  max-width: 780px; margin: 44px auto 0; padding-top: 28px;
  border-top: 1px solid var(--line); display: grid; gap: 8px;
}
.course-note p { font-size: 13.5px; color: var(--ink-3); }
.course-note strong { color: var(--ink-2); }

/* ===== 学习资料（列表式） ===== */
.material-grid { border-top: 1px solid var(--line); }
.material-card {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 40px;
  padding: 36px 4px; border-bottom: 1px solid var(--line);
}
.material-card h3 { font-family: var(--font-serif); font-size: 20px; color: var(--ink); flex: 0 0 230px; letter-spacing: .03em; line-height: 1.5; }
.material-card > p:not(.material-price) { flex: 1; font-size: 14px; color: var(--ink-2); }
.material-price { display: flex; flex-direction: column; gap: 6px; flex: 0 0 260px; text-align: right; font-family: var(--font-serif); font-size: 22px; color: var(--pine); font-weight: 600; }
.material-price span { font-family: var(--font-sans); font-size: 12px; color: var(--ink-3); font-weight: 400; line-height: 1.7; }
.material-price.free { font-family: var(--font-sans); font-size: 13px; color: var(--ink-3); font-weight: 400; letter-spacing: .1em; }

.materials-more { text-align: center; margin-top: 46px; }
.material-tip { margin-top: 22px; font-size: 12.5px; color: var(--ink-3); text-align: center; letter-spacing: .02em; }

/* ===== 师资团队 ===== */
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 44px; }
.team-card { text-align: center; border-top: 1px solid var(--line); padding-top: 32px; transition: border-color .25s; }
.team-card:hover { border-top-color: var(--pine); }
.team-avatar {
  width: 72px; height: 72px; margin: 0 auto 20px; border-radius: 50%;
  border: 1px solid var(--pine); color: var(--pine); background: transparent;
  font-family: var(--font-serif); font-size: 28px;
  display: flex; align-items: center; justify-content: center;
}
.team-card h3 { font-family: var(--font-serif); font-size: 20px; color: var(--ink); margin-bottom: 10px; letter-spacing: .04em; }
.team-card p { font-size: 14px; color: var(--ink-2); max-width: 300px; margin: 0 auto; }

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 44px; }
.contact-card { text-align: center; border-top: 1px solid var(--line); padding-top: 30px; transition: border-color .25s; }
.contact-card:hover { border-top-color: var(--pine); }
.contact-card h3 { font-size: 13px; font-weight: 600; letter-spacing: .2em; color: var(--ink-3); margin-bottom: 14px; }
.contact-line { font-family: var(--font-serif); font-size: 24px; color: var(--pine); margin-bottom: 10px; }
.contact-line strong { font-weight: 600; }
.contact-sub { font-size: 13px; color: var(--ink-3); }

/* ===== 页脚 ===== */
.footer { background: var(--pine-deep); color: #b8c6bd; padding: 56px 0; }
.footer-inner { text-align: center; display: grid; gap: 10px; }
.footer p { font-size: 14px; letter-spacing: .04em; }
.footer-icp { font-size: 12.5px; color: #7f9a8e; }
.footer-copy { font-size: 12px; color: #64806f; }

/* ===== 资料介绍页 ===== */
.page-hero { padding: 104px 0 80px; text-align: center; }
.page-hero .hero-badge { margin-bottom: 12px; }
.page-hero h1 { font-family: var(--font-serif); font-size: 52px; font-weight: 600; color: var(--ink); letter-spacing: .12em; margin: 6px 0 24px; }
.page-hero .hero-sub { font-size: 15px; }

.doc { font-size: 15px; color: var(--ink-2); }
.doc .section-title { margin-bottom: 36px; }
.doc h3 { font-family: var(--font-serif); font-size: 19px; color: var(--ink); margin: 36px 0 14px; letter-spacing: .03em; }
.doc p { margin-bottom: 12px; }
.doc ul { margin: 0 0 18px; display: grid; gap: 10px; }
.doc ul li { padding-left: 18px; position: relative; font-size: 14.5px; }
.doc ul li::before { content: ""; position: absolute; left: 0; top: 11px; width: 6px; height: 1px; background: var(--brass); }
.doc ul ul { margin: 10px 0 0; }
.doc-lead { font-family: var(--font-serif); font-size: 17px; color: var(--ink); line-height: 2.1; margin-bottom: 52px; }
.doc-note { background: var(--pine-soft); border-left: 2px solid var(--pine); border-radius: 2px; padding: 18px 22px; font-size: 14px; color: var(--ink-2); }
.doc-block { border: 1px solid var(--line); border-radius: 2px; padding: 28px 32px; margin-bottom: 18px; background: var(--paper); }
.doc-block h3 { margin-top: 0; }

.muted { color: var(--ink-3); font-size: 12px; }

.table-wrap { overflow-x: auto; margin: 20px 0 32px; border: 1px solid var(--line); border-radius: 2px; }
.doc-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 640px; }
.doc-table th, .doc-table td { padding: 15px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.doc-table th:nth-child(1), .doc-table td:nth-child(1) { width: 18%; }
.doc-table th:nth-child(2), .doc-table td:nth-child(2) { width: 38%; }
.doc-table th:nth-child(3), .doc-table td:nth-child(3) { width: 13%; }
.doc-table th:nth-child(4), .doc-table td:nth-child(4) { width: 31%; }
.doc-table th { background: var(--paper-2); color: var(--pine); font-weight: 600; font-size: 13px; letter-spacing: .08em; }
.doc-table tr:last-child td { border-bottom: none; }
.doc-table .row-hot td { background: var(--pine-soft); color: var(--pine); font-weight: 600; }

/* 原图相册 */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery a { border: 1px solid var(--line); border-radius: 2px; overflow: hidden; background: #fff; transition: border-color .2s, transform .2s; }
.gallery a:hover { border-color: var(--pine); transform: translateY(-2px); }
.gallery img { width: 100%; height: auto; display: block; }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .brand-grid, .team-grid, .contact-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .course-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .hero-stats { grid-template-columns: 1fr 1fr; border-bottom: none; }
  .stat { border-top: 1px solid var(--line); }
  .stat + .stat { border-left: none; }
  .material-card { flex-direction: column; gap: 10px; }
  .material-card h3 { flex: none; }
  .material-price { flex: none; text-align: left; }
}
@media (max-width: 640px) {
  .section { padding: 68px 0; }
  .hero { padding: 72px 0 56px; }
  .hero h1 { font-size: 40px; }
  .page-hero { padding: 96px 0 72px; }
  .page-hero h1 { font-size: 36px; }
  .brand-grid, .course-grid, .team-grid, .contact-grid { grid-template-columns: 1fr; }
  .course-card + .course-card { border-left: 1px solid var(--line); }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 0; }
  .gallery { grid-template-columns: 1fr; }
  .doc-lead { font-size: 16px; }
  .nav-links {
    display: none; position: absolute; top: 76px; left: 0; right: 0;
    background: var(--paper); flex-direction: column; gap: 0; padding: 8px 28px 18px;
    border-bottom: 1px solid var(--line); box-shadow: 0 12px 24px rgba(0, 0, 0, .05);
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a { padding: 13px 0; border-bottom: 1px solid var(--line); }
  .nav-links a:last-child { border-bottom: none; }
  .nav-toggle { display: flex; }
}