/* ========== AI Hub Guide 全局样式 ========== */
:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-sidebar: #1a2332;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border: #334155;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.3);
  --transition: .25s ease;
}
[data-theme="light"] {
  --bg: #f1f5f9;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(0,0,0,.08);
}

/* ========== Reset ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  display: flex;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; }
code {
  background: rgba(99,102,241,.15);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Fira Code', 'Cascadia Code', Consolas, monospace;
  font-size: .9em;
}
pre {
  background: #0d1117;
  color: #c9d1d9;
  padding: 16px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  position: relative;
  margin: 16px 0;
  font-size: .875rem;
  line-height: 1.6;
}
pre code { background: none; padding: 0; }

/* ========== 侧边栏 ========== */
.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition), background var(--transition);
  overflow-y: auto;
}
.sidebar .logo {
  padding: 0 24px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.sidebar .logo h1 {
  font-size: 1.35rem;
  background: linear-gradient(135deg, var(--primary-light), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.sidebar .logo p { font-size: .8rem; color: var(--text-muted); margin-top: 4px; }
.sidebar nav { flex: 1; padding: 0 12px; }
.nav-section { margin-bottom: 8px; }
.nav-section-title {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-muted);
  padding: 8px 12px 4px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: .9rem;
  cursor: pointer;
  transition: all var(--transition);
}
.nav-item:hover { background: rgba(99,102,241,.1); color: var(--text); }
.nav-item.active { background: rgba(99,102,241,.15); color: var(--primary-light); font-weight: 600; }
.nav-item .icon { font-size: 1.1rem; width: 24px; text-align: center; }

/* ========== 主内容区 ========== */
.main {
  flex: 1;
  margin-left: 280px;
  padding: 32px 48px;
}
.page { display: none; animation: fadeIn .3s ease; }
.page.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ========== 顶部栏 ========== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  gap: 16px;
  position: relative;
}
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 16px;
  flex: 1;
  max-width: 400px;
}
.search-box input {
  border: none;
  background: none;
  color: var(--text);
  outline: none;
  width: 100%;
  font-size: .9rem;
  margin-left: 8px;
}
.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px; height: 40px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--primary); }

/* ========== 搜索结果面板 ========== */
.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-width: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 8px;
  box-shadow: var(--shadow);
  z-index: 50;
  max-height: 360px;
  overflow-y: auto;
  display: none;
}
.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  cursor: pointer;
  transition: background var(--transition);
  border-bottom: 1px solid var(--border);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: rgba(99,102,241,.1); }
.search-result-title { font-size: .9rem; color: var(--text); }
.search-result-page { font-size: .75rem; color: var(--text-muted); white-space: nowrap; margin-left: 12px; }

/* ========== 卡片高亮动画 ========== */
.card.highlight {
  animation: cardHighlight 1.5s ease;
}
@keyframes cardHighlight {
  0%, 100% { border-color: var(--border); }
  30% { border-color: var(--primary); box-shadow: 0 0 20px rgba(99,102,241,.3); }
  70% { border-color: var(--primary); box-shadow: 0 0 20px rgba(99,102,241,.3); }
}

/* ========== PDF 原图折叠展示 ========== */
.pdf-collapse {
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.pdf-collapse summary {
  padding: 10px 16px;
  cursor: pointer;
  font-size: .9rem;
  color: var(--primary-light);
  background: rgba(99,102,241,.05);
  user-select: none;
  transition: background var(--transition);
  list-style: none;
}
.pdf-collapse summary::before {
  content: '▶ ';
  font-size: .75rem;
  transition: transform var(--transition);
  display: inline-block;
}
.pdf-collapse[open] summary::before {
  transform: rotate(90deg);
}
.pdf-collapse summary:hover {
  background: rgba(99,102,241,.1);
}
.pdf-collapse summary::-webkit-details-marker { display: none; }
.pdf-collapse .pdf-img-group {
  padding: 12px;
}
.pdf-img-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 16px 0;
}
.pdf-img-group img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}
.pdf-img-group img:hover {
  transform: scale(1.01);
  box-shadow: 0 4px 20px rgba(0,0,0,.3);
}
/* 图片灯箱 */
.lightbox {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.85);
  z-index: 999;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}
.lightbox.active { display: flex; }
.lightbox img {
  max-width: 92vw;
  max-height: 92vh;
  border-radius: 8px;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}
.card:hover { border-color: var(--primary); transform: translateY(-2px); }
.card h2 { font-size: 1.25rem; margin-bottom: 12px; }
.card h3 { font-size: 1.05rem; margin: 16px 0 8px; color: var(--primary-light); }
.card p, .card li { color: var(--text-muted); }
.card ul, .card ol { padding-left: 20px; margin: 8px 0; }
.card li { margin-bottom: 6px; }

/* ========== 首页网格 ========== */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin: 24px 0; }
.grid-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.grid-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: 0 8px 32px rgba(99,102,241,.2); }
.grid-card .card-icon { font-size: 2.5rem; margin-bottom: 12px; }
.grid-card h3 { font-size: 1rem; margin-bottom: 8px; }
.grid-card p { font-size: .85rem; color: var(--text-muted); }

/* ========== 标签 ========== */
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 600;
}
.tag-blue { background: rgba(59,130,246,.15); color: #60a5fa; }
.tag-green { background: rgba(34,197,94,.15); color: #4ade80; }
.tag-purple { background: rgba(168,85,247,.15); color: #c084fc; }
.tag-orange { background: rgba(245,158,11,.15); color: #fbbf24; }

/* ========== 复制按钮 ========== */
.copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  background: rgba(255,255,255,.1);
  border: none;
  color: #8b949e;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: .75rem;
  transition: all var(--transition);
}
.copy-btn:hover { background: rgba(255,255,255,.2); color: #fff; }
.copy-btn.copied { background: var(--success); color: #fff; }

/* ========== 步骤 ========== */
.step {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}
.step-num {
  width: 32px; height: 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .85rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.step-content { flex: 1; }
.step-content h4 { margin-bottom: 6px; }

/* ========== 提示框 ========== */
.tip {
  padding: 16px 20px;
  border-radius: var(--radius);
  margin: 16px 0;
  border-left: 4px solid;
}
.tip-info { background: rgba(59,130,246,.1); border-color: var(--info); }
.tip-warn { background: rgba(245,158,11,.1); border-color: var(--warning); }
.tip-success { background: rgba(34,197,94,.1); border-color: var(--success); }
.tip-danger { background: rgba(239,68,68,.1); border-color: var(--danger); }

/* ========== 汉堡菜单 ========== */
.menu-toggle {
  display: none;
  position: fixed;
  top: 16px; left: 16px;
  z-index: 200;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px; height: 40px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
  align-items: center;
  justify-content: center;
}

/* ========== 获取 API Key 组件 ========== */
.apikey-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.apikey-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(99,102,241,.4); }
.apikey-btn:active { transform: translateY(0); }
.apikey-btn-icon { font-size: 1.1rem; }

.apikey-input-group {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.apikey-input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: .9rem;
  outline: none;
  transition: border-color var(--transition);
}
.apikey-input:focus { border-color: var(--primary); }

.apikey-loading {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  color: var(--text-muted);
  font-size: .9rem;
}
.apikey-spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.apikey-result {
  margin-top: 16px;
  padding: 16px 20px;
  background: rgba(34,197,94,.08);
  border: 1px solid rgba(34,197,94,.25);
  border-radius: var(--radius);
}
.apikey-result-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--success);
}
.apikey-result-name {
  font-size: .9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.apikey-result-key-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
}
.apikey-value {
  flex: 1;
  word-break: break-all;
  font-size: .85rem;
  background: none !important;
  padding: 0 !important;
}
.apikey-copy-btn {
  padding: 6px 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: .8rem;
  white-space: nowrap;
  transition: all var(--transition);
}
.apikey-copy-btn:hover { background: var(--primary-dark); }
.apikey-copy-btn.copied { background: var(--success); }

.apikey-error {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(239,68,68,.08);
  border: 1px solid rgba(239,68,68,.25);
  border-radius: var(--radius);
  color: var(--danger);
  font-size: .9rem;
}

.apikey-fallback {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.apikey-fallback summary {
  padding: 10px 16px;
  cursor: pointer;
  font-size: .9rem;
  color: var(--text-muted);
  background: rgba(99,102,241,.03);
  user-select: none;
  list-style: none;
}
.apikey-fallback summary::before {
  content: '▶ ';
  font-size: .75rem;
  display: inline-block;
  transition: transform var(--transition);
}
.apikey-fallback[open] summary::before { transform: rotate(90deg); }
.apikey-fallback summary::-webkit-details-marker { display: none; }
.apikey-fallback summary:hover { background: rgba(99,102,241,.06); }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; padding: 24px 16px; padding-top: 64px; }
  .menu-toggle { display: flex; }
  .grid { grid-template-columns: 1fr; }
}