/* ========================================
   专题网站
   ======================================== */

.hidden {
  display: none !important;
}

/* 专题入口 · 图片卡片网格 */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.topic-card {
  display: block;
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  color: #fff;
  transition: transform 0.25s, box-shadow 0.25s;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
}

.topic-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s;
}

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

.topic-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(0, 0, 0, 0.75) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px;
}

.topic-card h3 {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: normal;
  margin-bottom: 4px;
}

.topic-card p {
  font-size: 12px;
  opacity: 0.85;
  line-height: 1.5;
}

.topic-card-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 3px 10px;
  font-size: 11px;
  background: rgba(140, 28, 28, 0.9);
  border-radius: 2px;
}

.topics-more-wrap {
  text-align: center;
  margin-top: 32px;
}

.topics-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 32px;
  font-size: 14px;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: 3px;
  transition: all 0.2s;
}

.topics-more-btn:hover {
  background: var(--color-primary);
  color: #fff;
}

/* 专题列表页 */
.topics-list-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.topics-list-item {
  display: flex;
  flex-direction: column;
  border: 1px solid #eee;
  border-radius: 4px;
  overflow: hidden;
  color: inherit;
  transition: box-shadow 0.25s, border-color 0.25s;
}

.topics-list-item:hover {
  border-color: rgba(140, 28, 28, 0.3);
  box-shadow: 0 6px 20px rgba(140, 28, 28, 0.08);
}

.topics-list-item-thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.topics-list-item-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.topics-list-item:hover .topics-list-item-thumb img {
  transform: scale(1.04);
}

.topics-list-item-body {
  padding: 14px 16px;
  flex: 1;
}

.topics-list-item-body h3 {
  font-size: 15px;
  font-weight: normal;
  color: #333;
  margin-bottom: 6px;
  transition: color 0.2s;
}

.topics-list-item:hover h3 {
  color: var(--color-primary);
}

.topics-list-item-body p {
  font-size: 12px;
  color: #999;
  line-height: 1.6;
}

.topics-list-item-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-top: 1px solid #eee;
  font-size: 12px;
  color: #bbb;
}

.topics-list-lock {
  color: var(--color-primary);
  font-size: 11px;
}

/* ========================================
   专题站 · 文档中心布局（对齐截图结构，红金风格）
   ======================================== */
#topicSiteWrap {
  --topic-nav: #8c1c1c;
  --topic-nav-active: #c9a227;
  --topic-footer: #4a0f0f;
}

.topic-site-page {
  min-height: 100vh;
  background: #f4f0ea;
}

.topic-doc-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topic-doc-wrap.hidden {
  display: none;
}

.topic-doc-hero {
  position: relative;
  min-height: 168px;
  color: #fff;
  overflow: hidden;
  flex-shrink: 0;
}

.topic-doc-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center right;
}

.topic-doc-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(90, 16, 16, 0.94) 0%, rgba(140, 28, 28, 0.82) 48%, rgba(72, 18, 18, 0.55) 100%),
    radial-gradient(circle at 18% 20%, rgba(201, 162, 39, 0.18), transparent 42%);
}

.topic-doc-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 22px 28px 28px;
  display: grid;
  grid-template-columns: 240px 1fr auto;
  align-items: center;
  gap: 20px;
  min-height: 168px;
}

.topic-doc-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
}

.topic-doc-brand .logo-mark {
  width: 42px;
  height: 42px;
  font-size: 18px;
}

.topic-doc-brand strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 1px;
}

.topic-doc-brand span {
  display: block;
  font-size: 10px;
  opacity: 0.75;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

.topic-doc-hero-title {
  text-align: center;
}

.topic-doc-hero-title h1 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: normal;
  letter-spacing: 2px;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

.topic-doc-hero-title p {
  margin-top: 8px;
  font-size: 13px;
  color: rgba(255, 236, 200, 0.9);
  letter-spacing: 1px;
}

.topic-doc-back {
  justify-self: end;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 3px;
  white-space: nowrap;
}

.topic-doc-back:hover {
  color: #fff;
  border-color: var(--color-gold);
  background: rgba(201, 162, 39, 0.15);
}

.topic-doc-body {
  flex: 1;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 24px 28px;
  box-sizing: border-box;
  align-items: start;
}

.topic-doc-sidebar {
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.topic-doc-section {
  margin-bottom: 10px;
}

.topic-doc-l1 {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--topic-nav);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-align: left;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(140, 28, 28, 0.18);
  transition: background 0.2s, transform 0.15s;
}

.topic-doc-l1:hover {
  background: var(--topic-nav-active);
}

.topic-doc-l1.active {
  background: linear-gradient(135deg, #b8860b 0%, var(--color-gold) 55%, #c9a227 100%);
  color: #3a2208;
  box-shadow: 0 3px 10px rgba(201, 162, 39, 0.35);
}

.topic-doc-panel {
  margin-top: 0;
  background: #fff;
  border: 1px solid #e6ddd4;
  border-top: none;
  border-radius: 0 0 4px 4px;
  overflow: hidden;
}

.topic-doc-section.is-active .topic-doc-l1 {
  border-radius: 4px 4px 0 0;
}

.topic-doc-sublist {
  list-style: none;
  margin: 0;
  padding: 6px 0;
}

.topic-doc-sublist--l3 {
  padding: 0 0 6px;
}

.topic-doc-group-btn,
.topic-doc-leaf {
  display: block;
  width: 100%;
  padding: 9px 16px;
  font-size: 13px;
  color: #333;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  line-height: 1.5;
  transition: background 0.15s, color 0.15s;
}

.topic-doc-group-btn {
  font-weight: 600;
  color: #222;
}

.topic-doc-group-btn::before {
  content: "▸ ";
  color: var(--color-primary);
  font-size: 11px;
}

.topic-doc-group.open > .topic-doc-group-btn::before {
  content: "▾ ";
}

.topic-doc-group > .topic-doc-sublist {
  display: none;
}

.topic-doc-group.open > .topic-doc-sublist {
  display: block;
}

.topic-doc-sublist--l3 .topic-doc-leaf {
  padding-left: 28px;
  font-size: 12px;
  color: #555;
}

.topic-doc-leaf:hover,
.topic-doc-group-btn:hover {
  background: rgba(140, 28, 28, 0.06);
  color: var(--color-primary);
}

.topic-doc-leaf.active {
  background: rgba(201, 162, 39, 0.16);
  color: var(--color-primary);
  font-weight: 600;
  border-left: 3px solid var(--color-gold);
  padding-left: 13px;
}

.topic-doc-sublist--l3 .topic-doc-leaf.active {
  padding-left: 25px;
}

.topic-doc-main {
  min-width: 0;
  min-height: 560px;
}

.topic-doc-viewer {
  height: calc(100vh - 260px);
  min-height: 520px;
  background: #fff;
  border: 1px solid #e6ddd4;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 4px 18px rgba(80, 40, 30, 0.06);
  display: flex;
  flex-direction: column;
}

.topic-pdf-viewer,
.topic-doc-html {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}

.topic-pdf-toolbar,
.topic-doc-html-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: linear-gradient(180deg, #3a3030 0%, #2a2222 100%);
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  flex-shrink: 0;
}

.topic-doc-filename {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topic-pdf-notice {
  font-size: 12px;
  color: var(--color-gold);
  flex-shrink: 0;
}

.topic-pdf-frame {
  flex: 1;
  width: 100%;
  min-height: 0;
  border: none;
  background: #525659;
}

.topic-doc-html-body {
  flex: 1;
  overflow: auto;
  padding: 28px 32px;
}

.topic-doc-html-body h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid #eee;
}

.topic-doc-html-body p,
.topic-doc-html-body li {
  font-size: 14px;
  line-height: 1.9;
  color: #555;
}

.topic-doc-html-body ul {
  padding-left: 20px;
  margin: 12px 0;
}

.topic-doc-footer {
  padding: 14px 24px;
  text-align: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.88);
  background: var(--topic-footer);
  flex-shrink: 0;
}

.topic-doc-fullscreen {
  position: fixed;
  right: 0;
  top: 48%;
  z-index: 50;
  writing-mode: vertical-rl;
  padding: 14px 8px;
  font-size: 12px;
  letter-spacing: 2px;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: 6px 0 0 6px;
  cursor: pointer;
  box-shadow: -2px 2px 10px rgba(140, 28, 28, 0.25);
}

.topic-doc-fullscreen:hover,
.topic-doc-fullscreen.is-on {
  background: #7a1818;
}

/* 登录弹窗 */
.topic-login-modal {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
}

.topic-login-modal.hidden {
  display: none;
}

.topic-login-panel {
  width: 100%;
  max-width: 400px;
  background: #fff;
  border-radius: 6px;
  padding: 32px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
}

.topic-login-panel h2 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 8px;
}

.topic-login-panel .login-hint {
  font-size: 13px;
  color: #999;
  text-align: center;
  margin-bottom: 24px;
}

.topic-login-field {
  margin-bottom: 16px;
}

.topic-login-field label {
  display: block;
  font-size: 13px;
  color: #666;
  margin-bottom: 6px;
}

.topic-login-field input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #ddd;
  border-radius: 3px;
  font-size: 14px;
  outline: none;
  box-sizing: border-box;
}

.topic-login-field input:focus {
  border-color: var(--color-primary);
}

.topic-login-error {
  font-size: 12px;
  color: #c0392b;
  margin-bottom: 12px;
  min-height: 18px;
}

.topic-login-submit {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 3px;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.2s;
}

.topic-login-submit:hover {
  background: #7a1818;
}

.topic-login-demo {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed #eee;
  font-size: 12px;
  color: #bbb;
  text-align: center;
}

@media (max-width: 992px) {
  .topics-grid,
  .topics-list-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .topic-doc-hero-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 14px;
    padding: 20px 16px;
  }

  .topic-doc-back {
    justify-self: center;
  }

  .topic-doc-body {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .topic-doc-sidebar {
    position: static;
    max-height: none;
  }

  .topic-doc-viewer {
    height: auto;
    min-height: 420px;
  }

  .topic-pdf-frame {
    min-height: 420px;
    height: 55vh;
  }

  .topic-doc-fullscreen {
    display: none;
  }
}

@media (max-width: 640px) {
  .topics-grid,
  .topics-list-grid {
    grid-template-columns: 1fr;
  }

  .topic-doc-hero {
    min-height: 140px;
  }

  .topic-doc-html-body {
    padding: 20px 16px;
  }
}