/* ===================================
   北城官网 - 极简风格样式系统
   NorthCity - Minimal Design System
   =================================== */

/* CSS Variables - Light Theme (Default) */
:root {
  /* Colors - Light */
  --color-bg: #fafafa;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f5f5f5;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;
  --color-text-light: #ffffff;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;
  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.05);
  --color-nav-bg: rgba(255, 255, 255, 0.95);
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", Consolas, monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Layout */
  --max-width: 1200px;
  --max-width-content: 720px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: #0a0a0a;
  --color-bg-secondary: #141414;
  --color-bg-tertiary: #1a1a1a;
  --color-text-primary: #f0f0f0;
  --color-text-secondary: #a0a0a0;
  --color-text-muted: #707070;
  --color-text-light: #ffffff;
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
  --color-border: #2a2a2a;
  --color-border-light: #1f1f1f;
  --color-card-bg: #141414;
  --color-card-shadow: rgba(0, 0, 0, 0.3);
  --color-nav-bg: rgba(10, 10, 10, 0.95);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  line-height: 1.7;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-top: 0;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-narrow {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===================================
   Navigation
   =================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
}

[data-theme="dark"] .nav {
  background: rgba(10, 10, 10, 0.85);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
  position: relative;
}

.nav-brand {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand:hover {
  color: var(--color-text-primary);
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-sm);
  cursor: pointer;
  z-index: 10;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  margin: 5px 0;
  transition: var(--transition-fast);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .nav-toggle {
    display: block;
  }
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4xl) var(--space-lg);
}

.hero-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.hero-title span {
  display: block;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-2xl);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-text-primary);
  color: var(--color-text-light);
}

.btn-primary:hover {
  background: #333;
  color: var(--color-text-light);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  padding: var(--space-sm) 0;
}

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

.btn-ghost .arrow {
  transition: transform var(--transition-fast);
}

.btn-ghost:hover .arrow {
  transform: translateX(4px);
}

/* ===================================
   Section Styles
   =================================== */
.section {
  padding: var(--space-4xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

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

/* ===================================
   Products Grid
   =================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.product-card {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
  display: block;
}

.product-card:hover {
  border-color: var(--color-border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  color: inherit;
}

.product-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.product-icon img {
  width: 100%;
  height: 100%;
  border-radius: 16px;
  object-fit: cover;
}

.product-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.product-tagline {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.product-meta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.product-badge {
  font-size: 0.75rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg);
  border-radius: 4px;
  color: var(--color-text-muted);
}

.product-badge.status-active {
  background: #dcfce7;
  color: #166534;
}

.product-badge.status-maintenance {
  background: #fef3c7;
  color: #92400e;
}

/* ===================================
   Current Work Section
   =================================== */
.current-work {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  border: 1px solid var(--color-border-light);
}

.current-work-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.current-work-title::before {
  content: "";
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

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

.current-work-list li {
  padding: var(--space-sm) 0;
  color: var(--color-text-secondary);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.current-work-list li::before {
  content: "→";
  color: var(--color-text-muted);
  flex-shrink: 0;
}

/* ===================================
   Values Section
   =================================== */
.values-section {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--space-4xl) 0;
}

.values-section .section-title {
  color: var(--color-text-light);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.value-item {
  padding: var(--space-lg) 0;
}

.value-item h4 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text-light);
}

.value-item p {
  color: #a1a1aa;
  font-size: 0.9375rem;
  margin: 0;
}

/* ===================================
   Posts List
   =================================== */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.post-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border-light);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

.post-item:hover {
  color: var(--color-accent);
}

.post-item:last-child {
  border-bottom: none;
}

.post-title {
  font-size: 1rem;
  font-weight: 500;
}

.post-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  flex-shrink: 0;
  margin-left: var(--space-lg);
}

/* ===================================
   Page Header
   =================================== */
.page-header {
  padding: calc(64px + var(--space-4xl)) 0 var(--space-3xl);
  background: var(--color-bg);
}

.page-header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
}

/* ===================================
   Product Detail Page
   =================================== */
.product-detail {
  padding: var(--space-3xl) 0;
}

.product-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.product-header .product-icon {
  width: 96px;
  height: 96px;
  flex-shrink: 0;
}

.product-info h1 {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.product-info .tagline {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.product-content {
  max-width: var(--max-width-content);
}

.product-content h2 {
  font-size: 1.25rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.product-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.product-content p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ===================================
   About Page
   =================================== */
.about-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
}

.about-content h2 {
  font-size: 1.5rem;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  color: var(--color-text-secondary);
  line-height: 1.9;
  font-size: 1.0625rem;
}

.about-content ul {
  list-style: none;
  padding: 0;
}

.about-content ul li {
  padding: var(--space-sm) 0;
  color: var(--color-text-secondary);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.about-content ul li::before {
  content: "•";
  color: var(--color-text-muted);
}

/* ===================================
   Connect Page
   =================================== */
.connect-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.connect-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--color-border-light);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

.connect-item:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
  color: inherit;
}

.connect-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: var(--border-radius-sm);
  font-size: 1.25rem;
}

.connect-info h4 {
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

.connect-info p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ===================================
   Footer
   =================================== */
.footer {
  padding: var(--space-3xl) 0;
  border-top: 1px solid var(--color-border-light);
  margin-top: var(--space-4xl);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

/* ===================================
   Utilities
   =================================== */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-1 { margin-top: var(--space-md); }
.mt-2 { margin-top: var(--space-xl); }
.mt-3 { margin-top: var(--space-2xl); }
.mb-1 { margin-bottom: var(--space-md); }
.mb-2 { margin-bottom: var(--space-xl); }
.mb-3 { margin-bottom: var(--space-2xl); }

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
  :root {
    --space-4xl: 4rem;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  
  .hero {
    min-height: auto;
    padding-top: calc(64px + var(--space-2xl));
  }
  
  .hero-content {
    padding: var(--space-2xl) var(--space-lg);
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-description {
    font-size: 1.0625rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-buttons .btn {
    text-align: center;
    justify-content: center;
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  /* Nav mobile */
  .nav-container {
    padding: 0 var(--space-md);
  }
  
  .site-settings {
    position: absolute;
    right: 60px;
    top: 50%;
    transform: translateY(-50%);
  }
  
  .settings-btn {
    padding: var(--space-xs) var(--space-sm);
  }
  
  .settings-btn span {
    display: none !important;
  }
  
  /* Section spacing */
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .section-header {
    margin-bottom: var(--space-xl);
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  /* Page header */
  .page-header {
    padding: var(--space-2xl) var(--space-lg);
    padding-top: calc(64px + var(--space-2xl));
  }
  
  .page-title {
    font-size: 2rem;
  }
  
  .page-description {
    font-size: 1rem;
  }
  
  /* Product cards */
  .product-card {
    padding: var(--space-lg);
  }
  
  .product-icon {
    width: 56px;
    height: 56px;
  }
  
  .product-name {
    font-size: 1.125rem;
  }
  
  /* Values grid */
  .values-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .value-item {
    padding: var(--space-lg);
  }
  
  /* Current work */
  .current-work {
    padding: var(--space-lg);
  }
  
  /* Posts list */
  .post-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
  }
  
  .post-date {
    font-size: 0.8125rem;
  }
  
  /* Connect page */
  .connect-links {
    gap: var(--space-md);
  }
  
  .connect-item {
    padding: var(--space-md);
  }
  
  .connect-icon {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
  
  .connect-info h4 {
    font-size: 0.9375rem;
  }
  
  .connect-info p {
    font-size: 0.8125rem;
  }
  
  /* About content */
  .about-content {
    padding: var(--space-lg);
  }
  
  .about-content h2 {
    font-size: 1.25rem;
  }
  
  /* Container narrow */
  .container-narrow {
    padding: 0 var(--space-md);
  }
  
  /* Buttons on mobile */
  .btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.9375rem;
  }
  
  .btn-primary, .btn-secondary {
    width: 100%;
  }
}

/* Extra small devices */
@media (max-width: 480px) {
  :root {
    --space-lg: 1.25rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  body {
    font-size: 0.9375rem;
  }
  
  .hero-title {
    font-size: 1.75rem;
  }
  
  .hero-label {
    font-size: 0.8125rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  .product-meta {
    flex-wrap: wrap;
  }
  
  .product-badge {
    font-size: 0.6875rem;
    padding: 0.2rem 0.5rem;
  }
  
  .nav-brand {
    font-size: 1.125rem;
  }
  
  .site-settings {
    right: 50px;
  }
}

/* ===================================
   Logs Timeline
   =================================== */
.logs-timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.logs-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border-light);
}

.log-item {
  position: relative;
  padding-bottom: var(--space-2xl);
}

.log-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-xl) - 4px);
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-text-muted);
  border-radius: 50%;
}

.log-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.log-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

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

.log-title a:hover {
  color: var(--color-accent);
}

.log-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ===================================
   Essay Card
   =================================== */
.essays-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.essay-card {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: all var(--transition-normal);
}

.essay-card:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  color: inherit;
}

.essay-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.essay-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.essay-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ===================================
   Empty State
   =================================== */
.empty-state {
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.empty-state p {
  font-size: 0.9375rem;
}

/* ===================================
   Site Settings (Theme & Language)
   =================================== */
.site-settings {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.settings-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.settings-btn:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border-color: var(--color-text-muted);
}

.settings-btn i {
  font-size: 1rem;
}

.settings-btn span {
  display: none;
}

@media (min-width: 768px) {
  .settings-btn span {
    display: inline;
  }
}

/* Dark mode specific adjustments */
[data-theme="dark"] .product-card {
  background: var(--color-card-bg);
  border-color: var(--color-border);
}

[data-theme="dark"] .product-card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .nav {
  background: var(--color-nav-bg);
  backdrop-filter: blur(20px);
}

[data-theme="dark"] .btn-primary {
  background: var(--color-accent);
}

[data-theme="dark"] .btn-ghost {
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

[data-theme="dark"] .btn-ghost:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

[data-theme="dark"] .current-work {
  background: var(--color-bg-secondary);
  border-color: var(--color-border);
}

[data-theme="dark"] .values-section {
  background: var(--color-bg-secondary);
}

[data-theme="dark"] .connect-item {
  background: var(--color-bg-secondary);
  border-color: var(--color-border);
}

[data-theme="dark"] img {
  opacity: 0.95;
}

/* ===================================
   Language Toggle Animation
   =================================== */
[data-lang="en"] [data-lang-show="zh"] {
  display: none !important;
}

[data-lang="zh"] [data-lang-show="en"] {
  display: none !important;
}

/* ===================================
   Additional Mobile Responsive Fixes
   =================================== */
@media (max-width: 768px) {
  /* 首页社交链接移动端优化 */
  .hero-buttons {
    width: 100%;
  }
  
  /* 确保所有容器有适当的内边距 */
  .container,
  .container-narrow {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }
  
  /* 导航栏移动端优化 */
  .nav-toggle {
    order: 3;
  }
  
  /* 确保图片在移动端不会溢出 */
  img {
    max-width: 100%;
    height: auto;
  }
  
  /* 产品图标在移动端稍小 */
  .product-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
  }
  
  /* 社交链接在移动端垂直排列 */
  .section .current-work div[style*="display: flex"][style*="justify-content: center"] {
    flex-direction: column;
    align-items: center;
    gap: var(--space-md) !important;
  }
}

@media (max-width: 480px) {
  /* 超小屏幕优化 */
  .hero {
    padding-top: calc(56px + var(--space-lg));
  }
  
  .nav-container {
    height: 56px;
  }
  
  .nav-links {
    top: 56px;
  }
  
  /* 按钮在超小屏幕完全撑满 */
  .btn {
    width: 100%;
    text-align: center;
    justify-content: center;
  }
  
  /* 产品卡片更紧凑 */
  .product-card {
    padding: var(--space-md);
  }
  
  .product-icon {
    width: 48px;
    height: 48px;
  }
  
  /* 文字大小调整 */
  .product-tagline {
    font-size: 0.8125rem;
  }
}