/* ============================================================
   校园智能问答助手 V2 - 全局样式
   ============================================================ */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #06b6d4;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg-dark: #0f0f1a;
  --bg-card: rgba(255,255,255,0.05);
  --bg-card-hover: rgba(255,255,255,0.09);
  --border: rgba(255,255,255,0.1);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --glass: rgba(15,15,26,0.7);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(99,102,241,0.25);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.7;
}

/* ===== 粒子画布 ===== */
#particles-canvas {
  position: fixed; top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none; z-index: 0;
  opacity: 0.6;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.navbar.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
.nav-container {
  max-width: 1280px; margin: 0 auto;
  padding: 0 24px;
  display: flex; align-items: center; height: 64px; gap: 16px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.15rem; font-weight: 700;
  color: var(--text); text-decoration: none;
  white-space: nowrap;
}
.nav-brand i { color: var(--primary); font-size: 1.4rem; }
.nav-brand .brand-badge {
  font-size: 0.6rem; background: var(--primary);
  color: #fff; padding: 1px 6px; border-radius: 20px;
  font-weight: 600; letter-spacing: 0.5px;
}
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-link {
  padding: 6px 14px; border-radius: 8px;
  color: var(--text-muted); text-decoration: none;
  font-size: 0.9rem; transition: var(--transition);
  display: flex; align-items: center; gap: 6px;
}
.nav-link:hover, .nav-link.active { color: var(--text); background: var(--bg-card); }
.nav-link.admin-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; margin-left: 8px;
}
.nav-link.admin-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.nav-search-mini {
  display: flex; align-items: center;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 24px; padding: 6px 16px; gap: 8px;
  transition: var(--transition); cursor: pointer;
}
.nav-search-mini:hover { border-color: var(--primary); }
.nav-search-mini input {
  background: none; border: none; outline: none;
  color: var(--text); font-size: 0.88rem; width: 160px;
}
.nav-search-mini input::placeholder { color: var(--text-dim); }
.nav-search-mini i { color: var(--text-dim); font-size: 0.85rem; }
.nav-toggle {
  display: none; background: none; border: none;
  color: var(--text); font-size: 1.2rem; cursor: pointer; padding: 8px;
}

/* ===== 移动端菜单 ===== */
.mobile-menu {
  display: none; position: fixed; top: 64px; left: 0; right: 0;
  background: var(--glass); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border); z-index: 999;
  flex-direction: column; padding: 12px;
}
.mobile-menu.open { display: flex; }
.mobile-link {
  padding: 12px 16px; border-radius: 8px;
  color: var(--text-muted); text-decoration: none;
  font-size: 0.95rem; display: flex; align-items: center; gap: 10px;
  transition: var(--transition);
}
.mobile-link:hover { background: var(--bg-card); color: var(--text); }

/* ===== 英雄区域 ===== */
.hero {
  position: relative; z-index: 1;
  min-height: 100vh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 100px 24px 60px;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(ellipse at 30% 40%, rgba(99,102,241,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(6,182,212,0.1) 0%, transparent 60%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(99,102,241,0.15); border: 1px solid rgba(99,102,241,0.3);
  color: var(--primary-light); padding: 6px 18px; border-radius: 20px;
  font-size: 0.85rem; font-weight: 600; margin-bottom: 24px;
  letter-spacing: 0.5px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800; line-height: 1.2;
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.05rem; color: var(--text-muted);
  max-width: 560px; margin: 0 auto 40px; line-height: 1.8;
}

/* ===== 搜索框 ===== */
.search-box-wrap {
  width: 100%; max-width: 680px; margin: 0 auto;
  position: relative; z-index: 10;
}
.search-box {
  display: flex; align-items: center;
  background: rgba(255,255,255,0.07);
  border: 1.5px solid var(--border);
  border-radius: 50px;
  padding: 8px 8px 8px 24px;
  gap: 12px;
  transition: var(--transition);
  box-shadow: var(--shadow);
}
.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.15), var(--shadow);
  background: rgba(255,255,255,0.09);
}
.search-box input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); font-size: 1.05rem;
}
.search-box input::placeholder { color: var(--text-dim); }
.search-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none; color: #fff; padding: 12px 28px;
  border-radius: 40px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
  display: flex; align-items: center; gap: 8px; white-space: nowrap;
}
.search-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(99,102,241,0.4); }

/* ===== 搜索建议下拉 ===== */
.suggest-dropdown {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: #1a1a2e; border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); z-index: 100;
  display: none;
}
.suggest-dropdown.show { display: block; }
.suggest-item {
  padding: 12px 20px; cursor: pointer;
  display: flex; align-items: center; gap: 12px;
  transition: var(--transition); font-size: 0.92rem;
}
.suggest-item:hover { background: var(--bg-card-hover); }
.suggest-item i { color: var(--primary); font-size: 0.85rem; }
.suggest-item .cat-tag {
  margin-left: auto; font-size: 0.75rem;
  background: rgba(99,102,241,0.15); color: var(--primary-light);
  padding: 2px 8px; border-radius: 10px;
}

/* ===== 搜索历史 ===== */
.search-history {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; margin-top: 16px;
}
.history-tag {
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-muted); padding: 4px 14px;
  border-radius: 20px; font-size: 0.82rem; cursor: pointer;
  transition: var(--transition); text-decoration: none;
  display: flex; align-items: center; gap: 6px;
}
.history-tag:hover { border-color: var(--primary); color: var(--primary-light); }
.history-tag .del-btn {
  color: var(--text-dim); font-size: 0.75rem; margin-left: 2px;
}
.history-tag .del-btn:hover { color: var(--danger); }

/* ===== 公告栏 ===== */
.notice-bar {
  position: relative; z-index: 1;
  max-width: 1280px; margin: 0 auto 0;
  padding: 0 24px;
}
.notice-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 18px;
  margin-bottom: 8px; font-size: 0.9rem;
  border-left: 3px solid var(--primary);
  transition: var(--transition);
}
.notice-item.warning { border-left-color: var(--warning); }
.notice-item.success { border-left-color: var(--success); }
.notice-item.danger  { border-left-color: var(--danger); }
.notice-item i { font-size: 0.9rem; }
.notice-item.info i    { color: var(--primary); }
.notice-item.warning i { color: var(--warning); }
.notice-item.success i { color: var(--success); }
.notice-item.danger i  { color: var(--danger); }

/* ===== 主容器 ===== */
.main-container {
  position: relative; z-index: 1;
  max-width: 1280px; margin: 0 auto;
  padding: 40px 24px 80px;
}

/* ===== 分区标题 ===== */
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px;
}
.section-title {
  font-size: 1.3rem; font-weight: 700;
  display: flex; align-items: center; gap: 10px;
}
.section-title i { color: var(--primary); }
.section-more {
  color: var(--text-muted); font-size: 0.85rem;
  text-decoration: none; transition: var(--transition);
  display: flex; align-items: center; gap: 4px;
}
.section-more:hover { color: var(--primary-light); }

/* ===== 分类卡片网格 ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px; margin-bottom: 48px;
}
.category-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 16px;
  text-align: center; text-decoration: none; color: var(--text);
  transition: var(--transition); cursor: pointer;
  position: relative; overflow: hidden;
}
.category-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  opacity: 0; transition: var(--transition);
}
.category-card:hover { transform: translateY(-4px); border-color: var(--primary); box-shadow: var(--shadow-glow); }
.category-card:hover::before { opacity: 0.08; }
.category-card .cat-icon {
  font-size: 2rem; margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.category-card .cat-name { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.category-card .cat-count { font-size: 0.8rem; color: var(--text-muted); }

/* ===== 问答卡片（卡片模式）===== */
.qa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.qa-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
  transition: var(--transition); cursor: pointer;
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; gap: 12px;
}
.qa-card:hover { transform: translateY(-3px); border-color: var(--primary); box-shadow: var(--shadow-glow); }
.qa-card .card-header { display: flex; align-items: flex-start; gap: 12px; }
.qa-card .card-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: #fff; flex-shrink: 0;
}
.qa-card .card-title {
  font-size: 1rem; font-weight: 600; line-height: 1.4;
  color: var(--text); text-decoration: none;
}
.qa-card .card-title:hover { color: var(--primary-light); }
.qa-card .card-excerpt {
  font-size: 0.85rem; color: var(--text-muted);
  line-height: 1.6; display: -webkit-box;
  -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.qa-card .card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: auto;
}
.qa-card .card-cat {
  background: rgba(99,102,241,0.15); color: var(--primary-light);
  padding: 3px 10px; border-radius: 10px; font-size: 0.78rem; font-weight: 500;
}
.qa-card .card-meta {
  display: flex; align-items: center; gap: 6px;
  color: var(--text-dim); font-size: 0.78rem;
}
/* 链接类型卡片 */
.qa-card.type-link { border-left: 3px solid var(--secondary); }
.qa-card.type-link .card-icon { background: linear-gradient(135deg, var(--secondary), #0891b2); }
.qa-card .card-link-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(6,182,212,0.15); color: var(--secondary);
  padding: 5px 14px; border-radius: 20px; font-size: 0.8rem;
  text-decoration: none; transition: var(--transition); border: 1px solid rgba(6,182,212,0.2);
}
.qa-card .card-link-btn:hover { background: rgba(6,182,212,0.25); transform: translateX(2px); }
/* 通知类型卡片 */
.qa-card.type-notice { border-left: 3px solid var(--warning); }
.qa-card.type-notice .card-icon { background: linear-gradient(135deg, var(--warning), #d97706); }

/* ===== 问答列表模式 ===== */
.qa-list-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px 20px;
  display: flex; align-items: center; gap: 16px;
  transition: var(--transition); margin-bottom: 10px;
  text-decoration: none; color: var(--text);
}
.qa-list-item:hover { border-color: var(--primary); background: var(--bg-card-hover); transform: translateX(4px); }
.qa-list-item .list-icon {
  width: 36px; height: 36px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; color: #fff; flex-shrink: 0;
}
.qa-list-item .list-title { flex: 1; font-size: 0.95rem; font-weight: 500; }
.qa-list-item .list-cat {
  background: rgba(99,102,241,0.12); color: var(--primary-light);
  padding: 2px 10px; border-radius: 10px; font-size: 0.78rem; white-space: nowrap;
}
.qa-list-item .list-meta { color: var(--text-dim); font-size: 0.8rem; white-space: nowrap; }

/* ===== 视图切换 ===== */
.view-toggle {
  display: flex; gap: 4px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 8px; padding: 3px;
}
.view-btn {
  padding: 6px 12px; border-radius: 6px; border: none;
  background: none; color: var(--text-muted); cursor: pointer;
  transition: var(--transition); font-size: 0.85rem;
}
.view-btn.active { background: var(--primary); color: #fff; }

/* ===== 搜索结果页 ===== */
.search-result-header {
  margin-bottom: 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.result-count { color: var(--text-muted); font-size: 0.9rem; }
.result-count strong { color: var(--primary-light); }
.keyword-highlight { color: var(--accent); font-weight: 600; }

/* ===== 分页 ===== */
.pagination {
  display: flex; justify-content: center; gap: 8px;
  margin-top: 40px; flex-wrap: wrap;
}
.page-btn {
  width: 38px; height: 38px; border-radius: 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; font-size: 0.9rem;
  transition: var(--transition); display: flex; align-items: center; justify-content: center;
  text-decoration: none;
}
.page-btn:hover { border-color: var(--primary); color: var(--primary-light); }
.page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.page-btn.disabled { opacity: 0.4; cursor: not-allowed; pointer-events: none; }

/* ===== AI 对话界面 ===== */
.chat-layout {
  display: flex; flex-direction: column;
  height: calc(100vh - 64px); padding-top: 64px;
  position: relative; z-index: 1;
}
.chat-header {
  background: var(--glass); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex; align-items: center; gap: 14px;
}
.chat-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: #fff; flex-shrink: 0;
}
.chat-avatar.online::after {
  content: ''; position: absolute;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--success); border: 2px solid var(--bg-dark);
  bottom: 2px; right: 2px;
}
.chat-bot-info { flex: 1; }
.chat-bot-name { font-weight: 700; font-size: 1rem; }
.chat-bot-status { font-size: 0.8rem; color: var(--success); display: flex; align-items: center; gap: 4px; }
.chat-bot-status::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--success); }
.chat-messages {
  flex: 1; overflow-y: auto; padding: 24px;
  display: flex; flex-direction: column; gap: 20px;
}
.message-row {
  display: flex; gap: 12px; align-items: flex-end;
  animation: msgIn 0.3s ease;
}
.message-row.user { justify-content: flex-end; }
.message-row > div:not(.msg-avatar) {
  max-width: 70%;
  min-width: 0;
}
@keyframes msgIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.msg-avatar {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 700;
}
.msg-avatar.bot { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; }
.msg-avatar.user { background: linear-gradient(135deg, var(--accent), #f97316); color: #fff; }
.msg-bubble {
  max-width: 100%; padding: 14px 18px;
  border-radius: 18px; font-size: 0.93rem; line-height: 1.7;
  position: relative;
}
.message-row.bot .msg-bubble {
  background: var(--bg-card); border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.message-row.user .msg-bubble {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; border-bottom-right-radius: 4px;
}
.msg-bubble .msg-time {
  font-size: 0.72rem; color: var(--text-dim); margin-top: 6px;
  display: block;
}
.message-row.user .msg-bubble .msg-time { color: rgba(255,255,255,0.6); text-align: right; }
/* Markdown 渲染 */
.msg-bubble p { margin-bottom: 8px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble strong { color: var(--primary-light); }
.message-row.user .msg-bubble strong { color: #fff; font-weight: 700; }
.msg-bubble code {
  background: rgba(99,102,241,0.2); padding: 1px 6px;
  border-radius: 4px; font-size: 0.85em; font-family: monospace;
}
.msg-bubble pre {
  background: rgba(0,0,0,0.3); border-radius: 8px;
  padding: 12px; margin: 8px 0; overflow-x: auto;
}
.msg-bubble pre code { background: none; padding: 0; }
.msg-bubble ol, .msg-bubble ul { padding-left: 20px; margin: 6px 0; }
.msg-bubble li { margin-bottom: 4px; }
/* 打字指示器 */
.typing-indicator {
  display: flex; gap: 4px; padding: 14px 18px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 18px; border-bottom-left-radius: 4px;
  width: fit-content;
}
.typing-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--primary-light); animation: typing 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-8px); opacity: 1; }
}
/* 快捷问题 */
.quick-questions {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px;
}
.quick-btn {
  background: rgba(99,102,241,0.12); border: 1px solid rgba(99,102,241,0.2);
  color: var(--primary-light); padding: 6px 14px; border-radius: 20px;
  font-size: 0.82rem; cursor: pointer; transition: var(--transition);
}
.quick-btn:hover { background: rgba(99,102,241,0.25); }
/* 对话输入框 */
.chat-input-area {
  background: var(--glass); backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  padding: 16px 24px;
}
.chat-input-row {
  display: flex; align-items: flex-end; gap: 12px;
  background: var(--bg-card); border: 1.5px solid var(--border);
  border-radius: 16px; padding: 10px 10px 10px 18px;
  transition: var(--transition);
}
.chat-input-row:focus-within { border-color: var(--primary); }
.chat-textarea {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); font-size: 0.95rem; resize: none;
  max-height: 120px; line-height: 1.6; font-family: inherit;
}
.chat-send-btn {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none; color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition); flex-shrink: 0;
}
.chat-send-btn:hover { transform: scale(1.05); box-shadow: 0 4px 15px rgba(99,102,241,0.4); }
.chat-send-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.chat-input-hint { font-size: 0.75rem; color: var(--text-dim); margin-top: 8px; text-align: center; }

/* ===== 详情页 ===== */
.detail-container { max-width: 900px; margin: 0 auto; }
.detail-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px; margin-bottom: 24px;
}
.detail-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 16px; line-height: 1.4; }
.detail-meta {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding-bottom: 20px; border-bottom: 1px solid var(--border); margin-bottom: 24px;
}
.detail-content {
  font-size: 0.97rem; line-height: 1.9; color: var(--text);
  white-space: pre-wrap; word-break: break-word;
}
.detail-content strong { color: var(--primary-light); }
.detail-link-card {
  display: flex; align-items: center; gap: 14px;
  background: rgba(6,182,212,0.08); border: 1px solid rgba(6,182,212,0.2);
  border-radius: var(--radius-sm); padding: 16px 20px; margin-top: 20px;
  text-decoration: none; color: var(--text); transition: var(--transition);
}
.detail-link-card:hover { background: rgba(6,182,212,0.14); transform: translateX(4px); }
.detail-link-card i { color: var(--secondary); font-size: 1.3rem; }
.detail-link-card .link-info { flex: 1; }
.detail-link-card .link-title { font-weight: 600; font-size: 0.95rem; }
.detail-link-card .link-url { font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }
.detail-link-card .link-arrow { color: var(--secondary); }

/* ===== 相关问题 ===== */
.related-section { margin-top: 32px; }
.related-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border);
  margin-bottom: 8px; text-decoration: none; color: var(--text);
  transition: var(--transition);
}
.related-item:hover { border-color: var(--primary); transform: translateX(4px); }
.related-item i { color: var(--primary); }

/* ===== 反馈页 ===== */
.feedback-form {
  max-width: 640px; margin: 0 auto;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px;
}
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 0.9rem; color: var(--text-muted); margin-bottom: 8px; font-weight: 500; }
.form-input, .form-textarea, .form-select {
  width: 100%; background: rgba(255,255,255,0.05);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); padding: 11px 16px; font-size: 0.95rem;
  transition: var(--transition); font-family: inherit;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-textarea { resize: vertical; min-height: 120px; }
.form-select option { background: #1a1a2e; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: 10px; font-size: 0.92rem;
  font-weight: 600; cursor: pointer; transition: var(--transition);
  border: none; text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(99,102,241,0.4); }
.btn-secondary {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary-light); }
.btn-danger { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: var(--danger); }
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn-sm { padding: 6px 14px; font-size: 0.82rem; border-radius: 8px; }

/* ===== 后台管理布局 ===== */
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
  width: 240px; background: #0d0d1a;
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  position: fixed; top: 0; left: 0; bottom: 0;
  z-index: 100; transition: var(--transition);
  overflow-y: auto;
}
.admin-logo {
  padding: 20px 20px 16px;
  display: flex; align-items: center; gap: 10px;
  font-size: 1.05rem; font-weight: 700;
  border-bottom: 1px solid var(--border);
}
.admin-logo i { color: var(--primary); font-size: 1.3rem; }
.admin-logo .version-tag {
  font-size: 0.65rem; background: var(--primary);
  color: #fff; padding: 1px 6px; border-radius: 10px; margin-left: auto;
}
.admin-nav { padding: 12px 0; flex: 1; }
.admin-nav-group { padding: 8px 16px 4px; font-size: 0.72rem; color: var(--text-dim); font-weight: 600; letter-spacing: 0.8px; text-transform: uppercase; }
.admin-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px; color: var(--text-muted);
  text-decoration: none; font-size: 0.9rem;
  transition: var(--transition); border-left: 3px solid transparent;
}
.admin-nav-item:hover { color: var(--text); background: var(--bg-card); }
.admin-nav-item.active { color: var(--primary-light); background: rgba(99,102,241,0.1); border-left-color: var(--primary); }
.admin-nav-item i { width: 18px; text-align: center; font-size: 0.9rem; }
.admin-nav-item .badge {
  margin-left: auto; background: var(--danger);
  color: #fff; font-size: 0.7rem; padding: 1px 6px; border-radius: 10px;
}
.admin-content { margin-left: 240px; flex: 1; min-height: 100vh; }
.admin-topbar {
  background: var(--glass); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 28px; height: 60px;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 50;
}
.admin-page-title { font-size: 1.05rem; font-weight: 700; display: flex; align-items: center; gap: 10px; }
.admin-page-title i { color: var(--primary); }
.admin-user-info { display: flex; align-items: center; gap: 12px; }
.admin-avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 700; color: #fff;
}
.admin-main { padding: 28px; }

/* ===== 统计卡片 ===== */
.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px; margin-bottom: 28px;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
  display: flex; align-items: center; gap: 16px;
  transition: var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.stat-icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; flex-shrink: 0;
}
.stat-icon.purple { background: rgba(99,102,241,0.2); color: var(--primary-light); }
.stat-icon.cyan   { background: rgba(6,182,212,0.2);  color: var(--secondary); }
.stat-icon.amber  { background: rgba(245,158,11,0.2); color: var(--accent); }
.stat-icon.green  { background: rgba(16,185,129,0.2); color: var(--success); }
.stat-icon.red    { background: rgba(239,68,68,0.2);  color: var(--danger); }
.stat-info { flex: 1; }
.stat-value { font-size: 1.8rem; font-weight: 800; line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: 0.82rem; color: var(--text-muted); }

/* ===== 图表区域 ===== */
.chart-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 20px; margin-bottom: 28px;
}
.chart-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
}
.chart-card-title {
  font-size: 0.95rem; font-weight: 700; margin-bottom: 18px;
  display: flex; align-items: center; gap: 8px; color: var(--text);
}
.chart-card-title i { color: var(--primary); }
.chart-canvas-wrap { position: relative; height: 220px; }

/* ===== 数据表格 ===== */
.data-table-wrap {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 20px;
}
.data-table-header {
  padding: 16px 20px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  padding: 12px 16px; text-align: left;
  font-size: 0.82rem; color: var(--text-dim); font-weight: 600;
  background: rgba(255,255,255,0.03); border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: 13px 16px; font-size: 0.88rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(255,255,255,0.03); }
.data-table .td-title { max-width: 280px; }
.data-table .td-title a { color: var(--text); text-decoration: none; }
.data-table .td-title a:hover { color: var(--primary-light); }

/* ===== 标签/徽章 ===== */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 10px; border-radius: 10px; font-size: 0.78rem; font-weight: 500;
}
.badge-primary { background: rgba(99,102,241,0.15); color: var(--primary-light); }
.badge-success { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--accent); }
.badge-danger  { background: rgba(239,68,68,0.15);  color: var(--danger); }
.badge-info    { background: rgba(6,182,212,0.15);  color: var(--secondary); }

/* ===== 搜索/筛选栏 ===== */
.filter-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.filter-input {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); padding: 8px 14px;
  font-size: 0.88rem; outline: none; transition: var(--transition);
}
.filter-input:focus { border-color: var(--primary); }
.filter-select {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); padding: 8px 14px;
  font-size: 0.88rem; outline: none; cursor: pointer;
}
.filter-select option { background: #1a1a2e; }

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px); z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: var(--transition);
}
.modal-overlay.show { opacity: 1; pointer-events: all; }
.modal {
  background: #1a1a2e; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  max-width: 560px; width: 90%; max-height: 85vh; overflow-y: auto;
  transform: translateY(20px); transition: var(--transition);
}
.modal-overlay.show .modal { transform: translateY(0); }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.modal-title { font-size: 1.1rem; font-weight: 700; }
.modal-close { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 1.1rem; padding: 4px; }
.modal-close:hover { color: var(--danger); }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ===== 空状态 ===== */
.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text-muted);
}
.empty-state i { font-size: 3rem; margin-bottom: 16px; opacity: 0.4; display: block; }
.empty-state p { font-size: 0.95rem; }

/* ===== Toast 提示 ===== */
.toast-container { position: fixed; top: 80px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: #1a1a2e; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 18px;
  display: flex; align-items: center; gap: 10px;
  font-size: 0.88rem; min-width: 240px; max-width: 360px;
  animation: toastIn 0.3s ease;
  box-shadow: var(--shadow);
}
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.info    { border-left: 3px solid var(--primary); }
.toast i.success { color: var(--success); }
.toast i.error   { color: var(--danger); }
.toast i.info    { color: var(--primary); }

/* ===== 动画 ===== */
.animate-fadeInUp    { animation: fadeInUp 0.6s ease both; }
.animate-fadeInDown  { animation: fadeInDown 0.5s ease both; }
.animate-slideUp     { animation: slideUp 0.5s ease both; }
.animate-fadeIn      { animation: fadeIn 0.6s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }
@keyframes fadeInUp   { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp    { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn     { from { opacity: 0; } to { opacity: 1; } }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .admin-sidebar { transform: translateX(-100%); }
  .admin-sidebar.open { transform: translateX(0); }
  .admin-content { margin-left: 0; }
  .chart-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-links, .nav-search-mini { display: none; }
  .nav-toggle { display: block; }
  .hero-title { font-size: 1.8rem; }
  .qa-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .msg-bubble { max-width: 85%; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .admin-main { padding: 16px; }
  .data-table-wrap { overflow-x: auto; }
}
@media (max-width: 480px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid { grid-template-columns: 1fr; }
  .search-btn span { display: none; }
}