/* ============================================
   AI Blog - Global Styles
   ============================================ */

/* --- CSS Variables (Default: Light Mode) --- */
:root {
  /* Primary Colors */
  --clr-primary: #00b4d8;
  --clr-primary-dim: #0096b5;
  --clr-accent: #9b30ff;
  --clr-accent-dim: #7a20d0;

  /* Background */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(0, 0, 0, 0.03);
  --bg-glass-border: rgba(0, 0, 0, 0.1);

  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  /* Shadows & Glows */
  --glow-primary: 0 0 20px rgba(0, 180, 216, 0.12);
  --glow-accent: 0 0 20px rgba(155, 48, 255, 0.1);
  --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.1);

  /* Spacing */
  --max-width: 1200px;
  --nav-height: 70px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Font */
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* --- Dark Mode Overrides --- */
body.dark {
  --clr-primary: #00f0ff;
  --clr-primary-dim: #00c4d6;
  --clr-accent: #bc13fe;
  --clr-accent-dim: #9a0fd6;

  --bg-body: #0a0e17;
  --bg-surface: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-border: rgba(255, 255, 255, 0.08);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --glow-primary: 0 0 20px rgba(0, 240, 255, 0.15);
  --glow-accent: 0 0 20px rgba(188, 19, 254, 0.15);
  --card-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 8px 40px rgba(0, 240, 255, 0.1);
}

/* --- Reset --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--transition-slow),
    color var(--transition-slow);
  min-height: 100vh;
  overflow-x: hidden;
}

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

ul,
ol {
  list-style: none;
}

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

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

input {
  font-family: inherit;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-body);
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.section-title {
  font-size: 1.75rem;
  margin-bottom: 32px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 50%;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
  border-radius: 2px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  color: #fff;
  box-shadow: var(--glow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
}

.btn-outline {
  border: 2px solid var(--clr-primary);
  color: var(--clr-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--clr-primary);
  color: #0a0e17;
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.85rem;
}

/* --- Tag --- */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
  background: rgba(0, 240, 255, 0.1);
  color: var(--clr-primary);
  border: 1px solid rgba(0, 240, 255, 0.2);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: rgba(0, 240, 255, 0.2);
  border-color: var(--clr-primary);
}

.tag-accent {
  background: rgba(188, 19, 254, 0.1);
  color: var(--clr-accent);
  border-color: rgba(188, 19, 254, 0.2);
}

.tag-accent:hover {
  background: rgba(188, 19, 254, 0.2);
  border-color: var(--clr-accent);
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(248, 250, 252, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--bg-glass-border);
  z-index: 1000;
  transition: background var(--transition-slow),
    border-color var(--transition-slow);
}

body.dark .navbar {
  background: rgba(10, 14, 23, 0.8);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-primary);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  color: var(--text-secondary);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--clr-primary);
  border-color: var(--clr-primary);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(248, 250, 252, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--bg-glass-border);
  }

  body.dark .nav-links {
    background: rgba(10, 14, 23, 0.95);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
}

/* ============================================
   Footer
   ============================================ */
.footer {
  border-top: 1px solid var(--bg-glass-border);
  padding: 48px 0 24px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 320px;
}

.footer-links h4 {
  font-size: 0.95rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 10px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--clr-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--bg-glass-border);
  color: var(--text-muted);
  font-size: 0.82rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ============================================
   Hero Section (Home)
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.25);
  color: var(--clr-primary);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.15;
}

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

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
  }
}

/* ============================================
   Article Cards
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(0, 240, 255, 0.2);
}

.card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(188, 19, 254, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, var(--bg-card));
}

.card-body {
  padding: 20px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-title {
  font-size: 1.15rem;
  margin-bottom: 10px;
  line-height: 1.4;
  transition: color var(--transition-fast);
}

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

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

@media (max-width: 480px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Featured Section (Home)
   ============================================ */
.featured-section {
  padding: 80px 0;
}

.featured-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.featured-main {
  grid-row: span 2;
}

.featured-main .card-image {
  height: 300px;
}

@media (max-width: 768px) {
  .featured-grid {
    grid-template-columns: 1fr;
  }
  .featured-main {
    grid-row: span 1;
  }
}

/* ============================================
   Latest Section (Home)
   ============================================ */
.latest-section {
  padding: 40px 0 80px;
}

.latest-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.latest-item {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.latest-item:hover {
  border-color: rgba(0, 240, 255, 0.2);
  box-shadow: var(--card-shadow-hover);
}

.latest-thumb {
  width: 120px;
  height: 80px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(188, 19, 254, 0.15));
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

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

.latest-info h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  line-height: 1.4;
}

.latest-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 8px;
}

.latest-info .card-meta {
  margin-bottom: 0;
}

@media (max-width: 480px) {
  .latest-item {
    flex-direction: column;
    align-items: flex-start;
  }
  .latest-thumb {
    width: 100%;
    height: 140px;
  }
}

/* ============================================
   Category Cloud (Home)
   ============================================ */
.categories-section {
  padding: 40px 0 80px;
  border-top: 1px solid var(--bg-glass-border);
}

.category-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.category-chip {
  padding: 10px 24px;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.category-chip:hover,
.category-chip.active {
  background: rgba(0, 240, 255, 0.1);
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

/* ============================================
   Blog Page (blog.html)
   ============================================ */
.page-header {
  padding: calc(var(--nav-height) + 48px) 0 40px;
  text-align: center;
}

.page-header h1 {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-secondary);
}

.search-box {
  position: relative;
  max-width: 480px;
  margin: 0 auto 48px;
}

.search-box input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-base);
}

.search-box input:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 4px rgba(0, 240, 255, 0.08);
}

.search-box i {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
}

.blog-section {
  padding: 0 0 80px;
}

/* ============================================
   Category Page (category.html)
   ============================================ */
.category-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  padding: calc(var(--nav-height) + 48px) 0 80px;
}

.category-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  height: fit-content;
}

.category-sidebar h3 {
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.sidebar-categories {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-category {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  background: none;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

.sidebar-category:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.sidebar-category.active {
  background: rgba(0, 240, 255, 0.08);
  border-color: rgba(0, 240, 255, 0.25);
  color: var(--clr-primary);
}

.sidebar-category .count {
  font-size: 0.78rem;
  padding: 2px 10px;
  border-radius: 12px;
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
}

.sidebar-category.active .count {
  background: rgba(0, 240, 255, 0.1);
  border-color: rgba(0, 240, 255, 0.25);
}

.category-content h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

@media (max-width: 768px) {
  .category-layout {
    grid-template-columns: 1fr;
  }
  .category-sidebar {
    position: static;
  }
  .sidebar-categories {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .sidebar-category {
    width: auto;
  }
}

/* ============================================
   Article Detail Page
   ============================================ */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  padding: calc(var(--nav-height) + 48px) 0 80px;
}

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

.article-header {
  margin-bottom: 40px;
}

.article-header h1 {
  font-size: 2.2rem;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.article-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}

.author-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.article-meta-item {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

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

.article-cover {
  width: 100%;
  height: 320px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.08), rgba(188, 19, 254, 0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  margin-bottom: 40px;
}

/* Article Content Typography */
.article-content {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--bg-glass-border);
}

.article-content h3 {
  font-size: 1.3rem;
  margin: 32px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.article-content strong {
  color: var(--text-primary);
}

.article-content blockquote {
  border-left: 4px solid var(--clr-primary);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--bg-glass);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.article-content blockquote p {
  margin-bottom: 0;
}

.article-content ul,
.article-content ol {
  margin: 16px 0 20px 24px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.article-content pre {
  margin: 24px 0;
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.article-content p code {
  background: var(--bg-glass);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--bg-glass-border);
  color: var(--clr-primary);
}

/* TOC Sidebar */
.toc-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  height: fit-content;
}

.toc-sidebar h3 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.toc-list {
  border-left: 2px solid var(--bg-glass-border);
  padding-left: 16px;
}

.toc-list a {
  display: block;
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
  margin-left: -18px;
  padding-left: 16px;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--clr-primary);
  border-left-color: var(--clr-primary);
}

@media (max-width: 900px) {
  .article-layout {
    grid-template-columns: 1fr;
  }
  .toc-sidebar {
    display: none;
  }
  .article-cover {
    height: 200px;
  }
}

/* ============================================
   About Page
   ============================================ */
.about-section {
  padding: calc(var(--nav-height) + 48px) 0 80px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-intro h1 {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.about-intro p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.stat-card {
  text-align: center;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
}

.stat-card .stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card .stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Contact Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
}

.contact-form h3 {
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
  font-family: inherit;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--clr-primary);
}

.form-group textarea {
  min-height: 120px;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================
   Page Padding Helper
   ============================================ */
.page-padding {
  padding-top: var(--nav-height);
}

/* ============================================
   Utilities
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Member / VIP Styles
   ============================================ */
:root {
  --clr-gold: #f0a500;
  --clr-gold-dim: #c48800;
}

body.dark {
  --clr-gold: #f5c842;
  --clr-gold-dim: #d4a830;
}

/* --- Member Tag --- */
.tag-member {
  background: rgba(240, 165, 0, 0.1);
  color: var(--clr-gold);
  border-color: rgba(240, 165, 0, 0.25);
}
.tag-member:hover {
  background: rgba(240, 165, 0, 0.2);
  border-color: var(--clr-gold);
}
.tag-member i { margin-right: 3px; }

/* --- Member Card Glow --- */
.card.card-member {
  border-color: rgba(240, 165, 0, 0.2);
}
.card.card-member:hover {
  border-color: rgba(240, 165, 0, 0.5);
  box-shadow: 0 8px 40px rgba(240, 165, 0, 0.12);
}
.card-member .card-image {
  background: linear-gradient(135deg, rgba(240, 165, 0, 0.12), rgba(200, 130, 0, 0.08));
}
.latest-item.latest-member {
  border-color: rgba(240, 165, 0, 0.15);
}
.latest-item.latest-member:hover {
  border-color: rgba(240, 165, 0, 0.4);
  box-shadow: 0 4px 24px rgba(240, 165, 0, 0.08);
}

/* --- Content Blur Gate (article page) --- */
.content-gate {
  position: relative;
}
.content-gate .gated-blur {
  position: relative;
}
.content-gate .gated-blur::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 260px;
  background: linear-gradient(transparent 0%, var(--bg-body) 85%);
  pointer-events: none;
  z-index: 2;
}
.gated-mask {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  margin-top: 16px;
  backdrop-filter: blur(10px);
}
.gated-mask .lock-icon {
  font-size: 2.5rem;
  color: var(--clr-gold);
  margin-bottom: 12px;
}
.gated-mask h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}
.gated-mask p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
}
.btn-gold {
  background: linear-gradient(135deg, var(--clr-gold), var(--clr-gold-dim));
  color: #fff;
  box-shadow: 0 0 20px rgba(240, 165, 0, 0.25);
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(240, 165, 0, 0.4);
}

/* --- Member Center Page --- */
.member-hero {
  padding: calc(var(--nav-height) + 60px) 0 40px;
  text-align: center;
}
.member-hero h1 {
  font-size: 2.2rem;
  margin-bottom: 12px;
}
.member-hero .gradient-text {
  background: linear-gradient(135deg, var(--clr-gold), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.member-hero p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* Member Status Banner */
.member-status-bar {
  max-width: 600px;
  margin: 0 auto 48px;
  padding: 20px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  backdrop-filter: blur(10px);
}
.member-status-bar .status-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.member-status-bar .status-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}
.member-status-bar .status-badge.vip {
  background: linear-gradient(135deg, #f0a500, #c48800);
  color: #fff;
}
.member-status-bar .status-badge.free {
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  color: var(--text-muted);
}
.member-status-bar .status-label {
  font-weight: 600;
}
.member-status-bar .status-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Pricing Cards */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 780px;
  margin: 0 auto 64px;
}
.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}
.pricing-card.featured {
  border-color: var(--clr-gold);
  box-shadow: 0 0 30px rgba(240, 165, 0, 0.1);
}
.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: 14px;
  right: -28px;
  padding: 3px 32px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--clr-gold), var(--clr-accent));
  transform: rotate(45deg);
}
.pricing-card .plan-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.pricing-card .plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 4px;
}
.pricing-card .plan-price sub {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}
.pricing-card .plan-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 20px;
}
.pricing-card .plan-features {
  text-align: left;
  margin-bottom: 24px;
  padding: 0 12px;
}
.pricing-card .plan-features li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pricing-card .plan-features li i {
  color: var(--clr-gold);
  font-size: 0.8rem;
}
@media (max-width: 600px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

/* Member Perks */
.member-perks {
  max-width: 900px;
  margin: 0 auto 64px;
}
.member-perks h2 {
  text-align: center;
  margin-bottom: 32px;
}
.perks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.perk-item {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}
.perk-item:hover {
  border-color: rgba(240, 165, 0, 0.25);
}
.perk-item .perk-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}
.perk-item h4 {
  font-size: 0.95rem;
  margin-bottom: 6px;
}
.perk-item p {
  font-size: 0.82rem;
  color: var(--text-muted);
}
@media (max-width: 600px) {
  .perks-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Login / Auth Page
   ============================================ */
.auth-section {
  padding: calc(var(--nav-height) + 60px) 0 80px;
  display: flex;
  align-items: center;
  min-height: 80vh;
}
.auth-card {
  max-width: 440px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-xl);
  padding: 48px 36px;
  backdrop-filter: blur(10px);
  box-shadow: var(--card-shadow);
}
.auth-header { text-align: center; margin-bottom: 32px; }
.auth-icon { font-size: 3rem; margin-bottom: 16px; }
.auth-header h2 { font-size: 1.5rem; margin-bottom: 8px; }
.auth-header p { color: var(--text-secondary); font-size: 0.88rem; }
.auth-form .form-group { margin-bottom: 18px; }
.auth-form label { display: block; margin-bottom: 6px; font-size: 0.88rem; font-weight: 500; color: var(--text-secondary); }
.auth-form label i { width: 18px; color: var(--clr-primary); }
.auth-form input[type="email"],
.auth-form input[type="password"] {
  width: 100%; padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--bg-glass); border: 1px solid var(--bg-glass-border);
  color: var(--text-primary); font-size: 0.9rem; outline: none;
  transition: border-color var(--transition-fast); font-family: inherit;
}
.auth-form input:focus { border-color: var(--clr-primary); box-shadow: 0 0 0 4px rgba(0, 180, 216, 0.08); }
.form-options { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; font-size: 0.84rem; }
.checkbox-label { display: flex; align-items: center; gap: 6px; color: var(--text-muted); cursor: pointer; }
.checkbox-label input[type="checkbox"] { accent-color: var(--clr-primary); width: 16px; height: 16px; }
.forgot-link { color: var(--clr-primary); font-size: 0.84rem; }
.forgot-link:hover { text-decoration: underline; }
.auth-footer { text-align: center; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--bg-glass-border); font-size: 0.88rem; color: var(--text-muted); }
.auth-footer a { color: var(--clr-primary); font-weight: 600; }
.auth-footer a:hover { text-decoration: underline; }

/* --- Navbar Login Button --- */
.nav-login-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 18px; border-radius: 20px; font-size: 0.85rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-dim));
  color: #fff; transition: all var(--transition-fast);
}
.nav-login-btn:hover { transform: translateY(-1px); box-shadow: var(--glow-primary); }
.nav-login-btn.logged-in {
  background: var(--bg-glass); border: 1px solid var(--bg-glass-border); color: var(--text-primary);
}
.nav-login-btn.logged-in:hover { border-color: var(--clr-primary); color: var(--clr-primary); box-shadow: none; transform: none; }