/* ============================================
   贺伯AI实战笔记 - 全站深色主题 v2.0
   CSS Variables + Glassmorphism + Animations
   ============================================ */

/* --- CSS 变量体系 --- */
:root {
  /* 色彩 */
  --bg-primary: #0f1120;
  --bg-card: rgba(22, 25, 44, 0.7);
  --bg-card-hover: rgba(26, 30, 52, 0.85);
  --amber: #d4a853;
  --amber-light: #e8c170;
  --amber-glow: rgba(212, 168, 83, 0.15);
  --blue: #2b6cb0;
  --blue-light: #63b3ed;
  --blue-glow: rgba(43, 108, 176, 0.25);
  --text-primary: #f1f5f9;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-dim: #4b5563;
  --text-body: #c8cdd8;
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(43, 108, 176, 0.25);

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 16px;
  --radius-pill: 50px;

  /* 效果 */
  --glass-bg: rgba(15, 17, 32, 0.85);
  --glass-bg-solid: rgba(15, 17, 32, 0.96);
  --glass-blur: blur(20px);
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.4);

  /* 渐变 */
  --gradient-brand: linear-gradient(135deg, var(--amber), var(--blue));
  --gradient-card-banner: linear-gradient(135deg, #0a1628 0%, #1a365d 40%, #2b6cb0 75%, #1e4a6e 100%);
  --gradient-glow: linear-gradient(90deg, rgba(43, 108, 176, 0.4), rgba(212, 168, 83, 0.5), rgba(43, 108, 176, 0.4));

  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --line-height: 1.7;
}

/* --- 基础重置 --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

/* --- 全局 body --- */
body {
  margin: 0;
  padding: 0;
  background: var(--bg-primary);
  color: var(--text-body);
  font-family: var(--font-sans);
  line-height: var(--line-height);
  min-height: 100vh;
}

body.home-page {
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* --- 字体导入 --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Noto+Sans+SC:wght@400;500;600;700;900&display=swap');

/* --- 加载骨架屏 --- */
.loading-skeleton {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.loading-skeleton::after {
  content: '';
  display: block;
  width: 200px;
  height: 4px;
  margin: var(--space-md) auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--blue-glow), var(--amber-glow), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* --- 共享：侧栏布局 (tools / blog) --- */
.page-wrapper {
  padding-top: 80px;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
  display: flex;
  gap: var(--space-xl);
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: 200px;
  flex-shrink: 0;
  padding-top: var(--space-sm);
  position: sticky;
  top: 80px;
  align-self: flex-start;
}

.sidebar h3 {
  font-size: 0.92rem;
  color: var(--text-primary);
  margin: 0 0 12px;
  font-weight: 700;
}

.cat-list { list-style: none; margin: 0; padding: 0; }
.cat-list li { margin-bottom: 2px; }
.cat-list a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 12px;
  border-radius: var(--radius-sm);
  color: #7a8194;
  text-decoration: none;
  font-size: 0.88rem;
  transition: background 0.2s, color 0.2s;
}
.cat-list a:hover { color: #e2e8f0; background: rgba(255,255,255,0.04); }
.cat-list a.active { color: #fff; background: var(--amber-glow); }
.cat-list .cat-icon { font-size: 1rem; }
.cat-count {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-dim);
  background: rgba(255,255,255,0.04);
  padding: 2px var(--space-sm);
  border-radius: var(--radius-md);
}

/* ============================================
   导航栏 - Glassmorphism Enhanced
   ============================================ */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 60px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.3s, box-shadow 0.3s;
}

.site-nav.scrolled {
  background: var(--glass-bg-solid);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin: 0; padding: 0;
}

.nav-menu a {
  color: #7a8194;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: var(--space-sm) 18px;
  border-radius: var(--radius-sm);
  transition: color 0.2s;
  position: relative;
}

.nav-menu a:hover { color: #e2e8f0; }

.nav-menu a.nav-active { color: #fff; }

.nav-menu a.nav-active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 18px; right: 18px;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 1px;
  animation: navUnderline 0.3s ease;
}

@keyframes navUnderline {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.nav-admin {
  background: var(--gradient-brand) !important;
  color: #fff !important;
  border-radius: var(--radius-sm) !important;
  padding: 6px var(--space-md) !important;
  font-size: 0.82rem !important;
  font-weight: 600 !important;
  transition: opacity 0.2s, transform 0.2s !important;
}

.nav-admin:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  color: #fff !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: #7a8194;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ============================================
   Hero Section - Animated Background
   ============================================ */
.hero {
  padding-top: 130px;
  padding-bottom: 50px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Subtle animated mesh gradient background */
.hero::before {
  content: '';
  position: absolute;
  inset: -50%;
  background:
    radial-gradient(ellipse 600px 400px at 30% 40%, rgba(43, 108, 176, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 500px 300px at 70% 60%, rgba(212, 168, 83, 0.06) 0%, transparent 70%);
  animation: heroMesh 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroMesh {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-30px, 20px) scale(1.05); }
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--text-secondary);
  padding: var(--space-sm) 28px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-pill);
  margin-bottom: 36px;
  background: rgba(255, 255, 255, 0.03);
  animation: badgePulse 3s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(212, 168, 83, 0); }
  50% { box-shadow: 0 0 20px 4px rgba(212, 168, 83, 0.1); }
}

.hero-heading { margin: 0 0 var(--space-lg); line-height: 1.1; }

.hero-line1 {
  display: block;
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
}

.hero-line2 {
  display: block;
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--amber);
  background: linear-gradient(90deg, var(--amber), #e8b95a, var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--text-muted);
  margin: 0;
  letter-spacing: 0.08em;
}

/* ============================================
   核心卡片 - Glassmorphism + Glow
   ============================================ */
.main-cards {
  flex: 1;
  padding: 10px var(--space-xl) 80px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.cards-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}

.card.show {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-hover);
}

.card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-glow);
  opacity: 0.6;
  transition: opacity 0.3s;
}

.card:hover::after { opacity: 1; }

.card-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg) var(--space-md) 20px;
  background: var(--gradient-card-banner);
  position: relative;
}

.card-banner::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 20px;
  background: linear-gradient(to bottom, transparent, var(--bg-card));
}

.card-emoji {
  font-size: 2.4rem;
  display: block;
  line-height: 1;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-md) 18px 22px;
  flex-grow: 1;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--space-xs);
}

.card-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0 0 10px;
}

.card-desc {
  font-size: 0.8rem;
  color: #7a8194;
  line-height: 1.6;
  margin: 0 0 14px;
  flex-grow: 1;
}

.card-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--amber);
  transition: color 0.2s;
}

.card:hover .card-link { color: var(--amber-light); }

/* ============================================
   右侧悬浮社交图标
   ============================================ */
.social-float {
  position: fixed;
  right: 20px;
  bottom: 100px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  background: rgba(22, 25, 44, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: #7a8194;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, transform 0.2s;
}

.float-icon:hover {
  background: var(--amber-glow);
  color: var(--amber);
  transform: translateY(-2px);
}

.float-icon svg { width: 20px; height: 20px; }

/* ============================================
   关于贺伯 - Enhanced
   ============================================ */
.about-section {
  padding: 60px var(--space-xl) 40px;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.about-avatar {
  width: 100px; height: 100px;
  border-radius: 50%;
  border: 3px solid transparent;
  background-image: var(--gradient-brand);
  background-origin: border-box;
  background-clip: content-box, border-box;
  object-fit: cover;
  margin-bottom: 20px;
  animation: avatarGlow 4s ease-in-out infinite;
}

@keyframes avatarGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(212, 168, 83, 0); }
  50% { box-shadow: 0 0 24px 6px rgba(212, 168, 83, 0.15); }
}

.about-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 var(--space-sm);
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.about-tag {
  font-size: 0.78rem;
  color: var(--amber);
  background: rgba(212, 168, 83, 0.1);
  border: 1px solid rgba(212, 168, 83, 0.2);
  padding: var(--space-xs) 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.03em;
}

.about-tagline {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0 0 20px;
  letter-spacing: 0.05em;
}

.about-bio {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 0 0 12px;
  text-align: left;
}

.about-quote {
  font-size: 0.92rem;
  color: var(--amber-light);
  font-style: italic;
  border-left: 3px solid rgba(212, 168, 83, 0.4);
  padding: 12px 20px;
  margin: 20px 0;
  background: rgba(212, 168, 83, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: var(--line-height);
}

.about-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin: 28px 0;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.about-social {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 28px 0 20px;
  flex-wrap: wrap;
}

.social-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  transition: transform 0.2s;
}

.social-card:hover { transform: translateY(-3px); }

.social-card img {
  width: 100px; height: 100px;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  object-fit: cover;
}

.social-card span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.about-contact {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0;
}

.about-contact a {
  color: var(--amber);
  text-decoration: none;
}

.about-contact a:hover { color: var(--amber-light); }

/* ============================================
   页脚 - Gradient Border
   ============================================ */
.site-footer {
  border-top: 2px solid transparent;
  border-image: var(--gradient-glow) 1;
  padding: var(--space-lg) 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin: 0;
}

.footer-links {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0; padding: 0;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover { color: #d1d5db; }

/* ============================================
   全站响应式
   ============================================ */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-menu {
    display: none;
    position: fixed;
    top: 60px; left: 0; right: 0;
    background: var(--glass-bg-solid);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    flex-direction: column;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-subtle);
    gap: 0;
    transform: translateY(-10px);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .nav-menu.open {
    display: flex;
    transform: translateY(0);
    opacity: 1;
    animation: slideDown 0.3s ease;
  }

  @keyframes slideDown {
    from { transform: translateY(-10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
  }

  .nav-menu a {
    padding: 12px var(--space-lg);
    font-size: 1rem;
    border-radius: 0;
  }

  .nav-menu a.nav-active::after { display: none; }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .footer-links { gap: var(--space-md); }

  .page-wrapper {
    flex-direction: column;
    gap: var(--space-md);
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .sidebar {
    width: 100%;
    position: static;
  }

  .cat-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
  }

  .cat-list li { margin: 0; }
  .cat-list a { padding: 6px 12px; font-size: 0.82rem; }
  .cat-count { display: none; }

  .hero {
    padding-top: 105px;
    padding-bottom: var(--space-xl);
  }

  .hero-badge {
    font-size: 0.72rem;
    padding: 6px 20px;
    margin-bottom: var(--space-lg);
  }

  .cards-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .card-banner { padding: 18px 12px var(--space-md); }
  .card-body { padding: 12px 14px 18px; }

  .social-float { right: 12px; bottom: 80px; }
  .float-icon { width: 36px; height: 36px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .cards-row {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .hero-line1, .hero-line2 { font-size: 2rem; }
  .hero-tagline { font-size: 0.82rem; }

  .cards-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .card-emoji { font-size: 2rem; }
  .card-body { padding: 12px var(--space-md) 18px; }
}