/* ===== 随时听 使用文档 - 白色主题样式表 ===== */
:root {
  --primary: #2563EB;
  --primary-light: #3B82F6;
  --primary-dark: #1D4ED8;
  --accent: #F97316;
  --accent-light: #FB923C;
  --success: #16A34A;
  --success-light: #22C55E;
  --warning: #EAB308;
  --danger: #DC2626;
  --danger-light: #EF4444;
  
  --bg: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  --text: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #94A3B8;
  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 960px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.top-nav .logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-nav .logo span { color: var(--text); font-weight: 600; }

.top-nav .nav-links { display: flex; gap: 4px; list-style: none; }

.top-nav .nav-links a {
  padding: 6px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius);
  transition: all 0.2s;
}

.top-nav .nav-links a:hover,
.top-nav .nav-links a.active {
  color: var(--primary);
  background: var(--bg-tertiary);
}

.sidebar {
  position: fixed;
  top: 56px;
  left: 0;
  bottom: 0;
  width: 240px;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--bg);
  padding: 16px 0;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-section { margin-bottom: 8px; }

.sidebar-section .section-title {
  padding: 6px 20px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-section a {
  display: block;
  padding: 7px 20px 7px 24px;
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}

.sidebar-section a:hover { color: var(--primary); background: var(--bg-secondary); }
.sidebar-section a.active {
  color: var(--primary);
  background: #EFF6FF;
  border-left-color: var(--primary);
  font-weight: 600;
}

.main-content {
  margin-left: 240px;
  margin-top: 56px;
  padding: 40px 48px 80px;
  max-width: var(--max-width);
}

.main-content.full-width { max-width: 100%; padding: 40px 48px 80px; }

.hero { text-align: center; padding: 60px 0 48px; }
.hero .app-icon { width: 80px; height: 80px; border-radius: 20px; margin-bottom: 20px; box-shadow: var(--shadow-lg); }
.hero h1 { font-size: 36px; font-weight: 800; color: var(--text); margin-bottom: 12px; }
.hero p { font-size: 17px; color: var(--text-secondary); max-width: 600px; margin: 0 auto 32px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all 0.2s;
}

.feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-card .icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 14px;
}

.feature-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

h1 { font-size: 30px; font-weight: 800; margin: 0 0 8px; }
h2 { font-size: 22px; font-weight: 700; margin: 40px 0 12px; padding-bottom: 8px; border-bottom: 2px solid var(--border); }
h3 { font-size: 17px; font-weight: 600; margin: 28px 0 8px; }
h4 { font-size: 15px; font-weight: 600; margin: 20px 0 6px; }
p { margin-bottom: 14px; color: var(--text-secondary); }
ul, ol { margin: 0 0 14px 20px; }
li { margin-bottom: 6px; color: var(--text-secondary); }

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text);
}

kbd {
  display: inline-block;
  padding: 2px 7px;
  font-size: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 1px 0 var(--border);
  font-family: inherit;
}

.highlight { background: #FEF3C7; padding: 2px 6px; border-radius: 4px; font-weight: 500; }

.tip, .info, .warning, .note {
  padding: 14px 18px;
  border-radius: var(--radius);
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.6;
  border-left: 4px solid;
}

.tip { background: #F0FDF4; border-color: var(--success); color: #166534; }
.info { background: #EFF6FF; border-color: var(--primary); color: #1E40AF; }
.warning { background: #FFF7ED; border-color: var(--accent); color: #9A3412; }
.note { background: var(--bg-secondary); border-color: var(--text-tertiary); color: var(--text-secondary); }

.steps { counter-reset: step; list-style: none; margin: 20px 0; padding: 0; }
.steps li {
  counter-increment: step;
  padding: 16px 20px 16px 52px;
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 26px;
  height: 26px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.steps li strong { color: var(--text); }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text);
  font-size: 13px;
}

tr:hover td { background: var(--bg-secondary); }

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 10px;
  margin-right: 4px;
}

.tag-pro { background: #FEF3C7; color: #92400E; }
.tag-free { background: #DBEAFE; color: #1E40AF; }
.tag-new { background: #F0FDF4; color: #166534; }

.page-footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
}

.page-footer a {
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

.page-footer a:hover { text-decoration: underline; }

@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-content { margin-left: 0; padding: 24px 20px 60px; }
  .main-content.full-width { padding: 24px 20px 60px; }
  .top-nav .nav-links { display: none; }
  .hero h1 { font-size: 26px; }
  .feature-grid { grid-template-columns: 1fr; }
  h1 { font-size: 24px; }
  h2 { font-size: 19px; }
  table { font-size: 13px; }
  th, td { padding: 8px 10px; }
}

@media print {
  .top-nav, .sidebar { display: none; }
  .main-content, .main-content.full-width { margin: 0; padding: 20px; }
}