/* ============================================================
   工具箱博客 - Professional Dark Theme v2.0
   设计风格: Premium Dark Editorial (Notion/Linear 风格)
   ============================================================ */

/* ==================== 设计变量 ==================== */
:root {
  /* 背景层次 */
  /* === 向后兼容别名 === */
  --bg-dark: #0c0e14;
  --border-color: rgba(255, 255, 255, 0.1);
  --primary-color: #6366f1;
  --accent-pink: #f43f5e;

  /* 背景层次 */
  --bg-base: #0c0e14;
  --bg-surface: #12151e;
  --bg-elevated: #1a1e2a;
  --bg-card: #1e2330;
  --bg-card-hover: #242939;
  --bg-overlay: rgba(12, 14, 20, 0.85);

  /* 主色调: 深邃靛蓝 + 琥珀金 */
  --color-primary: #6366f1;        /* 靛蓝 indigo */
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-accent: #f59e0b;         /* 琥珀金 */
  --color-accent-light: #fbbf24;
  --color-teal: #14b8a6;           /* 青色点缀 */

  /* 文字 */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0c0e14;

  /* 边框与分隔 */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.15);

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
  --gradient-surface: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg-surface) 100%);
  --gradient-mesh: radial-gradient(ellipse at 20% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 100%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
                   radial-gradient(ellipse at 50% 50%, rgba(20, 184, 166, 0.05) 0%, transparent 70%);

  /* 动效 */
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;

  /* 布局 */
  --max-width: 1200px;
  --header-height: 64px;
}

/* ==================== 基础重置 ==================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: var(--gradient-mesh);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

::selection {
  background: rgba(99, 102, 241, 0.35);
  color: var(--text-primary);
}

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

/* ==================== 布局工具 ==================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

/* ==================== 头部导航 ==================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-overlay);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color var(--duration-base) var(--ease-out);
}

.site-header:hover {
  border-bottom-color: var(--border-default);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: nowrap;
}

/* 与 .header-inner 相同（旧页面 class 名），保证顶栏与博客/首页一致 */
.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: nowrap;
}

/* 固定顶栏下主内容起始位置，避免被遮挡 */
.page-below-header {
  padding-top: calc(var(--header-height) + 24px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  text-decoration: none;
  flex-shrink: 0;
  min-width: 0;
  transition: opacity var(--duration-fast);
}

.logo:hover {
  opacity: 0.85;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}

.logo-text {
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  min-width: 0;
  justify-content: flex-end;
  flex-wrap: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.header-nav::-webkit-scrollbar {
  display: none;
  height: 0;
}

.nav-link {
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
  position: relative;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

/* 选中态：仅用底部高亮，避免背景块导致行高/对齐「顶出一块」 */
.nav-link.active {
  color: var(--text-primary);
  background: transparent;
  box-shadow: inset 0 -2px 0 0 var(--color-primary);
}

.nav-link.active:hover {
  background: var(--bg-elevated);
  box-shadow: inset 0 -2px 0 0 var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* 管理入口在管理页高亮 */
.header-actions .btn.active {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
  background: var(--bg-elevated);
}

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  transition: all var(--duration-base) var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.82rem;
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1rem;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.btn-ghost {
  color: var(--text-secondary);
  padding: 8px 12px;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.btn-accent {
  background: var(--gradient-accent);
  color: var(--text-inverse);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

/* ==================== 标签/徽章 ==================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge-primary {
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-primary-light);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.badge-accent {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-accent-light);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.badge-teal {
  background: rgba(20, 184, 166, 0.15);
  color: var(--color-teal);
  border: 1px solid rgba(20, 184, 166, 0.25);
}

.badge-muted {
  background: var(--bg-elevated);
  color: var(--text-muted);
  border: 1px solid var(--border-default);
}

/* 分类标签 */
.category-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  transition: all var(--duration-fast);
}

.category-tag.ai     { background: rgba(99,102,241,.15); color: #818cf8; border: 1px solid rgba(99,102,241,.25); }
.category-tag.money { background: rgba(245,158,11,.15); color: #fbbf24; border: 1px solid rgba(245,158,11,.25); }
.category-tag.etf    { background: rgba(20,184,166,.15); color: #2dd4bf; border: 1px solid rgba(20,184,166,.25); }
.category-tag.demand { background: rgba(244,63,94,.15); color: #fb7185; border: 1px solid rgba(244,63,94,.25); }
.category-tag.hot    { background: rgba(249,115,22,.15); color: #fb923c; border: 1px solid rgba(249,115,22,.25); }
.category-tag:hover  { transform: translateY(-1px); filter: brightness(1.1); }

/* ==================== 卡片 ==================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-base) var(--ease-out);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-default);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card-body {
  padding: 24px;
}

/* ==================== Hero Section ==================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + 60px) 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(99, 102, 241, 0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 85% 80%, rgba(245, 158, 11, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 10% 70%, rgba(20, 184, 166, 0.06) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-subtle) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 0%, black 0%, transparent 70%);
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary-light);
  margin-bottom: 28px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-eyebrow-dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-title-gradient {
  background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 40%, #6366f1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 72px;
  padding-top: 48px;
  border-top: 1px solid var(--border-subtle);
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1;
}

.hero-stat-value span {
  color: var(--color-primary);
}

.hero-stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ==================== 分类区块 ==================== */
.categories-section {
  padding: var(--section-gap, 80px) 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  gap: 20px;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

.section-title span {
  color: var(--color-primary);
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: all var(--duration-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--duration-base);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-default);
}

.category-card:hover::before {
  opacity: 1;
}

.category-card[data-cat="ai"]::before    { background: radial-gradient(circle at center, rgba(99,102,241,0.1) 0%, transparent 70%); }
.category-card[data-cat="money"]::before  { background: radial-gradient(circle at center, rgba(245,158,11,0.1) 0%, transparent 70%); }
.category-card[data-cat="etf"]::before   { background: radial-gradient(circle at center, rgba(20,184,166,0.1) 0%, transparent 70%); }
.category-card[data-cat="demand"]::before{ background: radial-gradient(circle at center, rgba(244,63,94,0.08) 0%, transparent 70%); }
.category-card[data-cat="hot"]::before   { background: radial-gradient(circle at center, rgba(249,115,22,0.08) 0%, transparent 70%); }

.category-icon {
  font-size: 1.8rem;
  line-height: 1;
  position: relative;
}

.category-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  position: relative;
}

.category-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  position: relative;
}

/* ==================== 文章列表 ==================== */
.posts-section {
  padding: 80px 0;
}

.posts-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

.posts-main {
  min-width: 0;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
}

.post-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.08);
}

.post-card-image {
  aspect-ratio: 16/9;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  overflow: hidden;
  position: relative;
}

.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.post-card:hover .post-card-image img {
  transform: scale(1.05);
}

.post-card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  transition: color var(--duration-fast);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card:hover .post-card-title {
  color: var(--color-primary-light);
}

.post-card-excerpt {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-card-stats {
  display: flex;
  gap: 12px;
}

.post-card-stat {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==================== 侧边栏 ==================== */
.posts-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sidebar-widget-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sidebar-tag {
  padding: 5px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--duration-fast);
}

.sidebar-tag:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.3);
  color: var(--color-primary-light);
}

.popular-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.popular-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  text-decoration: none;
  color: inherit;
  padding: 10px;
  border-radius: var(--radius-md);
  transition: background var(--duration-fast);
}

.popular-item:hover {
  background: var(--bg-elevated);
}

.popular-rank {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}

.popular-rank.top1 { background: rgba(245,158,11,.15); color: var(--color-accent); }
.popular-rank.top2 { background: rgba(148,163,184,.15); color: var(--text-secondary); }
.popular-rank.top3 { background: rgba(180,120,80,.15); color: #cd7f32; }

.popular-info {
  flex: 1;
  min-width: 0;
}

.popular-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--duration-fast);
}

.popular-item:hover .popular-title {
  color: var(--color-primary-light);
}

.popular-views {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ==================== 博客页面头部 ==================== */
.blog-page {
  padding-top: calc(var(--header-height) + 40px);
  min-height: 100vh;
}

.blog-hero {
  text-align: center;
  padding: 60px 0 48px;
  max-width: 680px;
  margin: 0 auto;
}

.blog-hero-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.blog-hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 博客筛选栏 */
.blog-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 36px;
}

.filter-btn {
  padding: 7px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.filter-btn.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 48px 0 24px;
}

.pagination-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.pagination-btn:hover,
.pagination-btn.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

/* ==================== 文章详情页 ==================== */
.article-page {
  padding-top: var(--header-height);
  min-height: 100vh;
}

.article-header {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 24px 40px;
  text-align: center;
}

.article-category {
  margin-bottom: 20px;
}

.article-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-cover {
  max-width: 900px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.article-cover-inner {
  aspect-ratio: 16/7;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

.article-cover-inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-layout {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 80px;
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 60px;
  align-items: start;
}

.article-content {
  min-width: 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-content h1, .article-content h2, .article-content h3 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2em 0 0.8em;
  line-height: 1.3;
}

.article-content h2 { font-size: 1.5rem; }
.article-content h3 { font-size: 1.2rem; }

.article-content p { margin-bottom: 1.2em; }

.article-content a {
  color: var(--color-primary-light);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(99,102,241,0.4);
}

.article-content a:hover {
  text-decoration-color: var(--color-primary-light);
}

.article-content code {
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.88em;
  color: var(--color-accent-light);
}

.article-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 1.5em;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

.article-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: rgba(99, 102, 241, 0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-content img {
  border-radius: var(--radius-lg);
  max-width: 100%;
}

/* 文章目录 */
.article-toc {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.toc-title {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-item a {
  display: block;
  padding: 5px 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--duration-fast);
}

.toc-item a:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

/* ==================== 工具页面 ==================== */
.tools-page {
  padding-top: calc(var(--header-height) + 40px);
  min-height: 100vh;
}

.tools-hero {
  text-align: center;
  padding: 60px 0 48px;
}

.tools-hero-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.tools-hero-title span {
  color: var(--color-primary);
}

.tools-hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  padding-bottom: 80px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-decoration: none;
  color: inherit;
  transition: all var(--duration-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
}

.tool-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.tool-icon {
  font-size: 2.2rem;
  line-height: 1;
}

.tool-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tool-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.tool-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--duration-fast);
}

.tool-card:hover .tool-arrow {
  transform: translateX(4px);
  color: var(--color-primary);
}

/* ==================== 管理后台 ==================== */
.admin-page {
  padding-top: calc(var(--header-height) + 40px);
  min-height: 100vh;
}

.admin-hero {
  padding: 48px 0 36px;
  text-align: center;
}

.admin-hero-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.admin-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.admin-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--duration-base);
}

.admin-stat-card:hover {
  border-color: var(--border-default);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.admin-stat-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.admin-stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.admin-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 数据表格 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.data-table th {
  padding: 14px 16px;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.data-table td {
  padding: 14px 16px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: var(--bg-elevated);
}

.data-table .title-cell {
  color: var(--text-primary);
  font-weight: 600;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
}

.status-dot.published { background: var(--color-teal); }
.status-dot.draft { background: var(--color-accent); }
.status-dot.pending { background: var(--text-muted); }

/* ==================== Footer ==================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 32px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col-title {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast);
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

/* ==================== 动画 ==================== */
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fade-in-up var(--duration-slow) var(--ease-out) both;
}

/* ==================== 工具提示 ==================== */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-fast);
}

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

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
  .posts-layout {
    grid-template-columns: 1fr;
  }
  .posts-sidebar {
    position: static;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-toc {
    position: static;
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }
  .header-inner {
    padding: 0 12px;
    gap: 8px;
  }
  .nav-link {
    padding: 6px 8px;
    font-size: 0.8125rem;
  }
  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }
  .hero-stat-value {
    font-size: 1.5rem;
  }
  .posts-grid {
    grid-template-columns: 1fr;
  }
  .categories-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .admin-stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  .data-table {
    font-size: 0.82rem;
  }
  .data-table th, .data-table td {
    padding: 10px 12px;
  }
}

/* ==================== 辅助类 ==================== */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--color-accent); }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.hidden { display: none; }

/* 加载动画 */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-elevated) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 服务端注入的首屏文章链（首页 / 博客列表），便于无 JS 爬虫跟链 */
.seo-crawl-links {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.seo-crawl-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.seo-crawl-links a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.seo-crawl-links a:hover {
  color: var(--color-primary-light);
}

/* 独立工具页底部：指向博客分类 */
.tool-blog-links {
  margin-top: 32px;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
}
.tool-blog-links-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.tool-blog-links-label {
  font-weight: 600;
  color: var(--text-secondary);
  margin-right: 4px;
}
.tool-blog-links a {
  color: var(--color-primary-light);
  text-decoration: none;
}
.tool-blog-links a:hover {
  text-decoration: underline;
}