/* ==========================================================================
   AI NEWS 全站核心设计系统 (DESIGN SYSTEM & TOKENS)
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* 品牌色阶（克莱因蓝体系） */
  --klein: #002FA7;
  --klein-bright: #0044FF;
  --klein-tint: #F0F4FF;
  --klein-soft: #F8FAFF;
  --klein-border: #D8E4FF;

  /* 基础黑白灰体系（暖纸白：抵消纯白眩光，衬托克莱因蓝） */
  --white: #FFFFFF;
  --bg-page: #FAFAF8;
  --bg-subtle: #F6F5F1;
  --bg-muted: #EFEDE8;
  
  --text-primary: #111827;      /* 高对比度标题与一级正文 */
  --text-regular: #374151;      /* 舒适长文阅读灰（防视觉疲劳） */
  --text-secondary: #6B7280;    /* 导语、副标题、次要信息 */
  --text-muted: #9CA3AF;        /* 元数据、Eyebrow 英文标签 */

  /* 边框与分割线（暖中性，避免冷灰边线压在象牙纸上发蓝） */
  --border: #E8E6E1;
  --border-light: #F1EFEA;
  --border-focus: #93C5FD;

  /* 强调色（警示/关键学者/重点时间） */
  --accent: #C41E3A;
  --accent-tint: #FEF2F2;
  --accent-border: #FECACA;

  /* 字体族 */
  --font-sans: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* 容器最大宽度（新闻长文黄金视线范围） */
  --content-max-width: 720px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 6px 18px rgba(0, 47, 167, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-regular);
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   全局导航栏 (SITE NAV)
   ========================================================================== */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 50;
  transition: all 0.2s ease;
}

.site-header-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 13px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.4px;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 2px;
}

.brand span {
  color: var(--klein);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 18px;
  align-items: center;
}

.nav-links a {
  font-family: 'Inter', var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--klein);
}

.nav-links a.active {
  color: var(--klein);
  font-weight: 700;
}

/* ==========================================================================
   页面容器 (CONTAINER)
   ========================================================================== */
.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 44px 24px 80px;
}

/* ==========================================================================
   阅读进度条 (READING PROGRESS)
   ========================================================================== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2.5px;
  background: linear-gradient(90deg, var(--klein), var(--klein-bright));
  width: 0%;
  z-index: 100;
  transition: width 0.1s ease-out;
}

/* ==========================================================================
   专题与长文头部 (HERO MASTHEAD)
   ========================================================================== */
.hero-masthead {
  padding-bottom: 30px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}

.hero-meta-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.badge-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
}

.badge-tag.blue {
  color: var(--klein);
  background: var(--klein-tint);
}

.hero-title {
  font-size: 32px;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.8px;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.hero-subtitle {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* 30秒速读微看板 */
.quick-take-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}

.take-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.take-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.take-value {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
}

.take-value span {
  color: var(--klein);
}

/* ==========================================================================
   正文微排印体系 (PROSE & TYPOGRAPHY)
   ========================================================================== */
.chapter {
  margin-bottom: 48px;
}

.chapter-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 600;
}

.chapter-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chapter-title::before {
  content: '▮';
  color: var(--klein);
  font-size: 14px;
}

.prose p {
  font-size: 15.5px;
  color: var(--text-regular);
  line-height: 1.88;
  margin-bottom: 18px;
  text-align: justify;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: var(--text-primary);
  font-weight: 700;
}

.prose .num {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}

.prose .turn {
  color: var(--klein);
  font-weight: 700;
}

.prose .accent {
  color: var(--accent);
  font-weight: 600;
}

/* 核心交锋 / 争议提炼卡片 */
.callout-box {
  margin: 22px 0;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-left: 3px solid var(--klein);
  border-radius: 0 6px 6px 0;
  padding: 16px 18px;
  font-size: 14.5px;
  line-height: 1.8;
}

.callout-box.danger {
  border-left-color: var(--accent);
}

.callout-box .box-title {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

/* 关键思考引语 */
.highlight-insight {
  margin: 24px 0;
  background: var(--klein-tint);
  border-left: 3px solid var(--klein);
  padding: 16px 20px;
  border-radius: 0 6px 6px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-primary);
}

/* 来源引注 */
.sources-bar {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.sources-bar a {
  color: var(--klein);
  text-decoration: none;
  border-bottom: 1px dotted var(--klein);
  transition: border-color 0.15s;
}

.sources-bar a:hover {
  border-bottom-style: solid;
}

/* ==========================================================================
   时间线流组件 (TIMELINE STREAM)
   ========================================================================== */
.timeline-stream {
  position: relative;
  padding-left: 24px;
  margin-top: 24px;
}

.timeline-stream::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--border);
}

.tl-entry {
  position: relative;
  margin-bottom: 24px;
}

.tl-entry:last-child {
  margin-bottom: 0;
}

.tl-entry::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--klein);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--klein);
}

.tl-box {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease;
}

.tl-box:hover {
  border-color: var(--border-focus);
}

.tl-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.tl-time {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 1px 6px;
  border-radius: 3px;
}

.tl-subject {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
}

.tl-desc {
  font-size: 14px;
  color: var(--text-regular);
  line-height: 1.75;
}

.tl-footnote {
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px dashed var(--border-light);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-muted);
}

.tl-footnote a {
  color: var(--klein);
  text-decoration: none;
}

/* ==========================================================================
   双方观点卡片 (VOICES)
   ========================================================================== */
.voices-deck {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.voice-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.voice-body {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 10px;
  position: relative;
  padding-left: 18px;
}

.voice-body::before {
  content: '“';
  position: absolute;
  left: 0;
  top: -4px;
  font-family: Georgia, serif;
  font-size: 26px;
  color: var(--klein);
}

.voice-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 8px;
  border-top: 1px solid var(--border-light);
}

.voice-meta a {
  color: var(--klein);
  text-decoration: none;
}

/* ==========================================================================
   待解问题卡片 (KEY QUESTIONS)
   ========================================================================== */
.q-deck {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.q-box {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 18px;
  display: flex;
  gap: 14px;
  box-shadow: var(--shadow-sm);
}

.q-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--klein);
  background: var(--klein-tint);
  width: 28px;
  height: 28px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.q-main h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.4;
}

.q-main p {
  font-size: 14px;
  color: var(--text-regular);
  line-height: 1.75;
}

/* ==========================================================================
   首页专用组件 (HOMEPAGE COMPONENTS)
   ========================================================================== */
/* 首页 Hero */
.home-hero {
  margin-bottom: 40px;
}

.home-hero-title {
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -0.8px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.home-hero-title span {
  color: var(--klein);
}

.home-hero-sub {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
}

.edition-badge-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  gap: 12px;
}

.edition-badge-bar a.subscribe-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  background: linear-gradient(135deg, var(--klein) 0%, var(--klein-bright) 100%);
  border: 1px solid transparent;
  padding: 5px 12px;
  border-radius: 4px;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

.edition-badge-bar a.subscribe-btn:hover {
  background: var(--klein);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

/* ==========================================================================
   专题案卷横滑轨道 (Special Issues - Silk Rail)
   ========================================================================== */
.special-section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}

.special-grid {
  display: flex;
  overflow-x: auto;
  gap: 14px;
  padding: 6px 4px 16px 4px;
  margin-bottom: 36px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox 隐藏滚动条 */
}

.special-grid::-webkit-scrollbar {
  display: none; /* Chrome/Safari 隐藏滚动条 */
}

.rail-wrap { position: relative; }
.rail-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--white);
  color: var(--klein); font-size: 24px; line-height: 1;
  cursor: pointer; z-index: 6; padding: 0 0 3px 0;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 14px rgba(0, 47, 167, 0.14);
  transition: border-color .2s ease, transform .2s ease;
}
.rail-btn:hover { border-color: var(--klein); transform: translateY(-50%) scale(1.08); }
.rail-btn:active { transform: translateY(-50%) scale(0.96); }
.rail-prev { left: 2px; }
.rail-next { right: 2px; }
.rail-btn[hidden] { display: none; }

.special-card-item {
  flex: 0 0 280px; /* 固定紧凑宽度，末端露边 peek */
  min-height: 140px;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  position: relative;
}

.special-card-item:hover {
  border-color: var(--klein);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.special-card-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.special-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 6px;
}

.special-card-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 移动端自适应：保持露边窥视体验 */
@media (max-width: 640px) {
  .special-card-item {
    flex: 0 0 78vw;
    max-width: 290px;
  }
}

/* 月份归档流 (Archive Timeline) */
.month-block {
  margin-bottom: 44px;
}

.month-title {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--klein);
  margin-bottom: 14px;
}

.month-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--klein-border);
}

.day-card {
  display: block;
  text-decoration: none;
  background: var(--white);
  border: 1px solid var(--border);
  border-left: 3px solid var(--klein-border);
  border-radius: 6px;
  padding: 16px 18px;
  margin-bottom: 10px;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.day-card:hover {
  border-color: var(--klein-border);
  border-left-color: var(--klein-bright);
  background: var(--klein-soft);
  transform: translateX(3px);
  box-shadow: var(--shadow-sm);
}

.day-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.day-card-date {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
}

.day-card-date strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.enhanced-badge {
  display: inline-block;
  margin-left: 6px;
  color: var(--klein-bright);
  font-size: 12px;
  font-weight: 700;
}

.day-card-arrow {
  color: var(--klein);
  font-size: 14px;
  font-weight: 700;
  opacity: 0.5;
  transition: opacity 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.day-card:hover .day-card-arrow {
  opacity: 1;
  color: var(--klein-bright);
  transform: translateX(2px);
}

.day-card-headline {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.5;
  letter-spacing: -0.2px;
  margin-bottom: 6px;
  transition: color 0.15s ease;
}

.day-card:hover .day-card-headline {
  color: var(--klein-bright);
}

.day-card-meta {
  font-size: 12px;
  font-weight: 500;
  color: var(--klein);
  font-family: var(--font-mono);
  line-height: 1.4;
}

/* ==========================================================================
   全局页脚 (FOOTER)
   ========================================================================== */
.site-footer {
  margin-top: 36px;
  padding-top: 14px;
  border-top: 2px solid var(--klein-bright);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.site-footer .brand-mark {
  color: var(--text-primary);
  font-weight: 700;
}

/* ==========================================================================
   移动端响应式 (RESPONSIVE)
   ========================================================================== */
@media (max-width: 640px) {
  .container {
    padding: 24px 16px 48px;
  }
  .hero-title {
    font-size: 24px;
  }
  .home-hero-title {
    font-size: 26px;
  }
  .quick-take-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .special-grid {
    gap: 10px;
  }
  .day-card {
    flex-direction: column;
    gap: 8px;
  }
  .day-card-date-badge {
    align-self: flex-start;
  }
  .edition-badge-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .timeline-stream {
    padding-left: 20px;
  }
  .q-box {
    flex-direction: column;
    gap: 8px;
  }
}

/* ==========================================================================
   白话导读组件 (PLAIN GUIDE & GLOSSARY)
   ========================================================================== */
.plain-guide {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 26px;
  margin-bottom: 40px;
}

.pg-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--klein);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pg-label::before {
  content: '💡';
  font-size: 14px;
}

.pg-body {
  font-size: 15px;
  color: var(--text-regular);
  line-height: 1.8;
}

.pg-point {
  display: block;
  margin-bottom: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--klein);
  font-weight: 600;
  color: var(--text-primary);
}

.pg-glossary {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.pg-glossary-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 13.5px;
}

.pg-term {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--klein);
  display: inline-block;
  margin-bottom: 2px;
}

.pg-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 14px;
  font-style: italic;
}

@media (max-width: 640px) {
  .pg-glossary {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   全站交互增强组件 (INTERACTIVE ENHANCEMENTS)
   ========================================================================== */

/* 搜索与筛选工具栏 (Search & Filters) */
.filter-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}

.filter-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--white);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.filter-chip:hover {
  color: var(--klein);
  border-color: var(--klein-border);
}

.filter-chip.active {
  background: var(--klein);
  color: var(--white);
  border-color: var(--klein);
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-primary);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 12px 5px 30px;
  width: 180px;
  transition: all 0.2s ease;
  outline: none;
}

.search-input:focus {
  width: 230px;
  border-color: var(--klein);
  box-shadow: 0 0 0 3px var(--klein-tint);
}

/* 全站搜索结果列表（数据来自 search-index.json） */
.search-results {
  margin: 16px 0 6px;
  border-top: 1px solid var(--border);
}

.sr-head {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  padding: 10px 2px 6px;
}

.sr-head b {
  color: var(--klein);
  font-weight: 600;
}

.sr-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sr-item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 12px;
  padding: 10px 2px;
  border-top: 1px dashed var(--border-light);
}

.sr-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding-top: 3px;
}

.sr-title {
  font-size: 14px;
  line-height: 1.55;
  font-weight: 500;
}

.sr-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.sr-title a:hover {
  color: var(--klein);
}

.sr-cat {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--klein);
  margin-left: 8px;
  white-space: nowrap;
}

.sr-snip {
  font-size: 12px;
  line-height: 1.65;
  color: var(--text-muted);
  margin-top: 3px;
}

.sr-item mark,
.sr-snip mark {
  background: var(--klein-tint);
  color: var(--klein);
  padding: 0 1px;
}

.sr-empty {
  padding: 14px 2px 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.sr-loading {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding: 12px 2px;
}

.search-icon {
  position: absolute;
  left: 10px;
  font-size: 12px;
  color: var(--text-muted);
  pointer-events: none;
}

/* 浮动返回顶部 (Back to top) */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  color: var(--klein);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.25s ease;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--klein);
  color: var(--white);
  border-color: var(--klein);
  box-shadow: var(--shadow-hover);
}

/* 复制提醒气泡 (Toast) */
.toast-msg {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text-primary);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 8px 16px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toast-msg.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}