/* =========================================================
   玄易道学 - 前台全局样式（道风水墨风格）
   ========================================================= */
:root {
  --ink: #2b2620;          /* 墨色主文字 */
  --ink-soft: #5c5449;     /* 次级文字 */
  --ink-faint: #8a8174;    /* 弱文字 */
  --paper: #f6f2e9;        /* 宣纸底色 */
  --paper-deep: #efe8d9;   /* 深一档纸色 */
  --card: #fdfbf6;         /* 卡片纸白 */
  --cinnabar: #a63a2b;     /* 朱砂 */
  --cinnabar-dark: #8c2f22;
  --gold: #8a6d3b;         /* 描金 */
  --line: #d8cfbc;         /* 边框线 */
  --shadow: rgba(43, 38, 32, 0.12);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", SimSun, serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "Noto Serif SC", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* 宣纸纹理背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(166, 58, 43, 0.03), transparent 50%),
    radial-gradient(ellipse at 85% 90%, rgba(43, 38, 32, 0.04), transparent 50%);
  pointer-events: none;
}

a { color: inherit; text-decoration: none; transition: color 0.25s; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 242, 233, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border: 1.5px solid var(--cinnabar);
  color: var(--cinnabar);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  transform: rotate(-4deg);
  background: var(--card);
  box-shadow: 2px 2px 0 rgba(166, 58, 43, 0.15);
}

.brand-name {
  font-family: var(--kai);
  font-size: 24px;
  letter-spacing: 4px;
  color: var(--ink);
}

.brand-name em {
  font-style: normal;
  color: var(--cinnabar);
}

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

.main-nav a {
  padding: 8px 16px;
  font-size: 15px;
  letter-spacing: 2px;
  color: var(--ink-soft);
  position: relative;
}

.main-nav a:hover { color: var(--cinnabar); }

.main-nav a.active { color: var(--cinnabar); }

.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 2px;
  background: var(--cinnabar);
  transform: scaleX(0.6);
  transition: transform 0.3s;
}

.main-nav a.active:hover::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  width: 40px;
  height: 40px;
  font-size: 18px;
  color: var(--ink);
}

/* ---------------- 英雄横幅 ---------------- */
.hero {
  position: relative;
  padding: 90px 0 100px;
  text-align: center;
  overflow: hidden;
}

/* 云纹装饰 */
.hero::before {
  content: "☰";
  position: absolute;
  left: 8%;
  top: 18%;
  font-size: 120px;
  color: rgba(166, 58, 43, 0.05);
  transform: rotate(6deg);
}

.hero::after {
  content: "易";
  position: absolute;
  right: 9%;
  bottom: 12%;
  font-size: 200px;
  font-family: var(--kai);
  color: rgba(43, 38, 32, 0.04);
}

.hero-vertical {
  writing-mode: vertical-rl;
  position: absolute;
  left: 30px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--kai);
  font-size: 15px;
  letter-spacing: 12px;
  color: var(--ink-faint);
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

.hero-title {
  font-family: var(--kai);
  font-size: 52px;
  letter-spacing: 14px;
  margin-bottom: 18px;
  position: relative;
  display: inline-block;
}

/* 标题朱砂印章 */
.hero-title::after {
  content: "道";
  position: absolute;
  right: -58px;
  top: -18px;
  width: 42px;
  height: 42px;
  font-size: 22px;
  color: #fff;
  background: var(--cinnabar);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(10deg);
  box-shadow: 3px 3px 6px rgba(166, 58, 43, 0.35);
  border-radius: 4px;
}

.hero-subtitle {
  font-size: 18px;
  letter-spacing: 6px;
  color: var(--ink-soft);
  margin-bottom: 40px;
}

.hero-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 32px;
  color: var(--gold);
}

.hero-divider::before,
.hero-divider::after {
  content: "";
  width: 90px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}

.hero-divider::after {
  background: linear-gradient(90deg, var(--gold), transparent);
}

.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 34px;
  border: 1px solid var(--cinnabar);
  font-size: 15px;
  letter-spacing: 3px;
  transition: all 0.3s;
}

.btn-primary { background: var(--cinnabar); color: #fff; }
.btn-primary:hover { background: var(--cinnabar-dark); box-shadow: 0 6px 18px rgba(166, 58, 43, 0.3); }

.btn-ghost { color: var(--cinnabar); background: transparent; }
.btn-ghost:hover { background: rgba(166, 58, 43, 0.08); }

/* ---------------- 区块 ---------------- */
.section { padding: 64px 0; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.section-title {
  font-family: var(--kai);
  font-size: 30px;
  letter-spacing: 6px;
  position: relative;
  padding-left: 18px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--cinnabar);
}

.section-title small {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 3px;
  margin-left: 12px;
  font-family: var(--serif);
}

.section-more {
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 2px;
}

.section-more:hover { color: var(--cinnabar); }

.section-more::after { content: " ›"; }

/* ---------------- 卡片 ---------------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 28px var(--shadow);
}

.card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--paper-deep);
}

.card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.card:hover .card-cover img { transform: scale(1.05); }

.card-cover .card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--cinnabar);
  color: #fff;
  font-size: 12px;
  letter-spacing: 2px;
  padding: 3px 12px;
  border-radius: 2px;
}

.card-cover .card-badge.play::after { content: " ▶"; }

.card-body { padding: 18px 20px 20px; }

.card-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-title:hover { color: var(--cinnabar); }

.card-summary {
  font-size: 13.5px;
  color: var(--ink-faint);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.card-meta {
  display: flex;
  gap: 16px;
  font-size: 12.5px;
  color: var(--ink-faint);
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

.card-meta .cat { color: var(--cinnabar); }

/* ---------------- 分类标签 ---------------- */
.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin: 0 auto 50px;
  max-width: 900px;
}

.category-tags a {
  border: 1px solid var(--line);
  padding: 8px 24px;
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--ink-soft);
  background: var(--card);
}

.category-tags a:hover,
.category-tags a.active {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  background: rgba(166, 58, 43, 0.05);
}

/* ---------------- 分页 ---------------- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 46px;
}

.pagination button {
  min-width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-soft);
  font-size: 14px;
  transition: all 0.25s;
}

.pagination button:hover:not(:disabled) { border-color: var(--cinnabar); color: var(--cinnabar); }
.pagination button.active { background: var(--cinnabar); border-color: var(--cinnabar); color: #fff; }
.pagination button:disabled { opacity: 0.4; cursor: not-allowed; }

/* ---------------- 页头（列表页） ---------------- */
.page-head {
  position: relative;
  text-align: center;
  padding: 64px 0 44px;
}

.page-head h1 {
  font-family: var(--kai);
  font-size: 38px;
  letter-spacing: 10px;
  margin-bottom: 10px;
}

.page-head p { color: var(--ink-soft); letter-spacing: 2px; font-size: 15px; }

.search-bar {
  display: flex;
  max-width: 460px;
  margin: 30px auto 0;
  border: 1px solid var(--line);
  background: var(--card);
}

.search-bar input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  padding: 12px 16px;
  font-size: 15px;
  color: var(--ink);
}

.search-bar button {
  border: none;
  background: var(--cinnabar);
  color: #fff;
  padding: 0 22px;
  letter-spacing: 2px;
  font-size: 14px;
}

/* ---------------- 文章详情 ---------------- */
.article-detail {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 48px 56px;
  margin: 40px 0 60px;
}

.article-detail h1 {
  font-family: var(--kai);
  font-size: 32px;
  letter-spacing: 3px;
  text-align: center;
  margin-bottom: 16px;
}

.detail-meta {
  display: flex;
  justify-content: center;
  gap: 22px;
  font-size: 13px;
  color: var(--ink-faint);
  padding-bottom: 24px;
  border-bottom: 1px dashed var(--line);
  margin-bottom: 30px;
}

.article-cover { margin: 0 0 30px; border: 1px solid var(--line); }

/* 文章正文排版 */
.article-content {
  font-size: 16.5px;
  line-height: 2;
  color: #33302b;
}

.article-content h2,
.article-content h3,
.article-content h4 {
  font-family: var(--kai);
  letter-spacing: 2px;
  margin: 34px 0 16px;
  color: var(--ink);
}

.article-content h2 {
  font-size: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--cinnabar);
}

.article-content h3 { font-size: 20px; }
.article-content h4 { font-size: 17px; color: var(--ink-soft); }

.article-content p { margin-bottom: 18px; text-align: justify; }

.article-content img {
  margin: 10px auto;
  border: 1px solid var(--line);
}

.article-content blockquote {
  margin: 20px 0;
  padding: 16px 22px;
  background: var(--paper-deep);
  border-left: 4px solid var(--gold);
  color: var(--ink-soft);
  font-family: var(--kai);
}

.article-content blockquote p { margin-bottom: 0; }

.article-content ul,
.article-content ol { margin: 0 0 18px 28px; }
.article-content li { margin-bottom: 6px; }

.article-content code {
  background: var(--paper-deep);
  padding: 2px 8px;
  font-size: 14px;
  border: 1px solid var(--line);
}

.article-content pre {
  background: #2b2620;
  color: #e8e2d5;
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.7;
}

.article-content pre code { background: none; border: none; color: inherit; padding: 0; }

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.article-content th,
.article-content td {
  border: 1px solid var(--line);
  padding: 10px 14px;
  font-size: 14.5px;
}

.article-content th { background: var(--paper-deep); }

.article-content a { color: var(--cinnabar); border-bottom: 1px dashed var(--cinnabar); }

/* ---------------- 课程详情 ---------------- */
.course-detail {
  margin: 40px 0 60px;
  background: var(--card);
  border: 1px solid var(--line);
  overflow: hidden;
}

.course-player-wrap {
  position: relative;
  background: #1a1712;
  aspect-ratio: 16 / 9;
}

.course-player {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.course-info { padding: 34px 44px 40px; }

.course-info h1 {
  font-family: var(--kai);
  font-size: 30px;
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.course-desc {
  color: var(--ink-soft);
  font-size: 15px;
  margin-bottom: 20px;
}

.chapter-list { margin-top: 26px; }

.chapter-list h3 {
  font-family: var(--kai);
  font-size: 18px;
  letter-spacing: 3px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  margin-bottom: 8px;
  background: var(--paper);
  cursor: pointer;
  transition: all 0.25s;
}

.chapter-item:hover,
.chapter-item.active {
  border-color: var(--cinnabar);
  background: rgba(166, 58, 43, 0.05);
}

.chapter-item .idx {
  width: 30px;
  height: 30px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-soft);
}

.chapter-item.active .idx {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #fff;
}

.chapter-item .ch-title { flex: 1; font-size: 15px; }
.chapter-item .ch-dur { font-size: 13px; color: var(--ink-faint); }
.chapter-item .ch-tag {
  flex: none;
  font-size: 12px;
  padding: 1px 8px;
  border-radius: 10px;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
}
.chapter-item .ch-tag-preview {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
  background: rgba(166, 58, 43, 0.06);
}
.chapter-item.chapter-locked { opacity: 0.72; }
.chapter-item.chapter-locked .idx { background: var(--bg); }

/* ---------------- 公告 ---------------- */
.announcement {
  margin: 30px auto 0;
  max-width: 900px;
  border: 1px solid var(--gold);
  background: rgba(138, 109, 59, 0.06);
  padding: 12px 20px;
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 14px;
  color: var(--gold);
}

.announcement b { letter-spacing: 2px; flex: none; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  margin-top: 60px;
  border-top: 1px solid var(--line);
  background: rgba(239, 232, 217, 0.5);
  padding: 40px 0 30px;
  text-align: center;
}

.footer-brand {
  font-family: var(--kai);
  font-size: 22px;
  letter-spacing: 6px;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 13px;
  color: var(--ink-faint);
  max-width: 600px;
  margin: 0 auto 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.footer-links a:hover { color: var(--cinnabar); }

.footer-copy { font-size: 12px; color: var(--ink-faint); }

/* ---------------- 空状态 ---------------- */
.empty {
  text-align: center;
  padding: 70px 0;
  color: var(--ink-faint);
}

.empty .empty-mark {
  font-size: 52px;
  font-family: var(--kai);
  color: var(--line);
  margin-bottom: 14px;
}

/* ---------------- 加载 ---------------- */
.loading {
  text-align: center;
  padding: 60px 0;
  color: var(--ink-faint);
  letter-spacing: 3px;
}

.loading::after {
  content: "";
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--line);
  border-top-color: var(--cinnabar);
  border-radius: 50%;
  margin-left: 12px;
  vertical-align: -4px;
  animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- 导航用户区 ---------------- */
.header-user { display: flex; align-items: center; gap: 8px; }

.user-link {
  font-size: 14px;
  color: var(--ink-soft);
  padding: 6px 14px;
  border: 1px solid transparent;
  letter-spacing: 1px;
  transition: all 0.25s;
  white-space: nowrap;
}

.user-link:hover { color: var(--cinnabar); }
.user-link-primary { border-color: var(--cinnabar); color: var(--cinnabar); }
.user-link-primary:hover { background: var(--cinnabar); color: #fff; }
.user-name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; color: var(--ink); border-color: var(--line); }

/* ---------------- 登录 / 注册 ---------------- */
.auth-page {
  min-height: calc(100vh - 380px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.auth-box {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 40px 44px;
  box-shadow: 0 16px 40px var(--shadow);
}

.auth-box h1 {
  font-family: var(--kai);
  font-size: 26px;
  letter-spacing: 6px;
  text-align: center;
  margin-bottom: 8px;
}

.auth-sub { text-align: center; color: var(--ink-faint); font-size: 13px; margin-bottom: 28px; }
.auth-field { margin-bottom: 18px; }
.auth-field label { display: block; font-size: 13px; color: var(--ink-soft); letter-spacing: 2px; margin-bottom: 6px; }
.auth-field input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 11px 14px;
  font-size: 15px;
  color: var(--ink);
  outline: none;
  transition: border-color 0.25s;
}

.auth-field input:focus { border-color: var(--cinnabar); }
.auth-btn { width: 100%; justify-content: center; }
.auth-switch { text-align: center; margin-top: 18px; font-size: 13.5px; color: var(--ink-faint); }
.auth-switch a { color: var(--cinnabar); }
.auth-tip { color: var(--cinnabar); font-size: 13.5px; margin: -8px 0 16px; min-height: 20px; text-align: center; }

/* ---------------- 课程访问权限角标 ---------------- */
.access-tag {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 12px;
  letter-spacing: 1px;
  padding: 3px 10px;
  border-radius: 2px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  z-index: 1;
}

.card-locked { opacity: 0.82; }

.access-tag.paid { background: rgba(166, 58, 43, 0.9); }
.access-tag.login { background: rgba(43, 38, 32, 0.7); }
.access-tag.public { background: rgba(138, 109, 59, 0.85); }

/* ---------------- 课程锁定提示 ---------------- */
.lock-panel {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: #e8e2d5;
  background: rgba(26, 23, 18, 0.9);
  text-align: center;
  padding: 20px;
}

.lock-panel .lock-icon { font-size: 44px; }
.lock-panel h3 { font-family: var(--kai); font-size: 22px; letter-spacing: 4px; margin-bottom: 4px; }
.lock-panel p { font-size: 14px; color: #b8b0a2; max-width: 360px; }
.lock-panel .btn { margin-top: 6px; }
.lock-panel .btn-ghost { color: #e8e2d5; border-color: #8a8174; }
.lock-panel .btn-ghost:hover { background: rgba(255, 255, 255, 0.1); }
.lock-panel .btn-primary { background: var(--cinnabar); border-color: var(--cinnabar); }
.lock-panel .btn-primary:hover { background: var(--cinnabar-dark); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 38px; letter-spacing: 8px; }
  .hero-vertical { display: none; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; align-items: center; justify-content: center; }
  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 10px 20px;
    display: none;
    box-shadow: 0 10px 24px var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 8px; border-bottom: 1px dashed var(--line); }
  .main-nav a.active::after { display: none; }
  .header-user { gap: 4px; }
  .user-link { padding: 6px 8px; font-size: 13px; }
  .user-name { max-width: 76px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding: 60px 0 70px; }
  .hero-title { font-size: 30px; letter-spacing: 5px; }
  .hero-title::after { right: -36px; top: -14px; width: 34px; height: 34px; font-size: 18px; }
  .hero-subtitle { font-size: 14px; letter-spacing: 3px; }
  .article-detail { padding: 28px 22px; }
  .course-info { padding: 24px 20px; }
  .section { padding: 44px 0; }
}