:root {
  --bg-body: #f7f9fc;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.82);
  --bg-footer: #17202A;
  --bg-banner: #eef3fa;
  --text-primary: #17202A;
  --text-heading: #0B1E2E;
  --text-secondary: #334155;
  --text-muted: #4B5563;
  --text-link: #0F4C81;
  --text-link-hover: #0A2F4F;
  --text-btn: #ffffff;
  --bg-btn: #0F4C81;
  --bg-btn-hover: #0A2F4F;
  --border-light: #CBD5E1;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --card-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
  --banner-overlay: linear-gradient(135deg, rgba(15, 76, 129, 0.72) 0%, rgba(23, 32, 42, 0.55) 100%);
  --tag-bg: #E2E8F0;
  --tag-text: #1F2937;
  --faq-border: #D1D9E6;
  --input-bg: #ffffff;
  --input-border: #94A3B8;
  --input-text: #17202A;
  --input-placeholder: #64748B;
  --footer-text: #E2E8F0;
  --footer-heading: #FFFFFF;
  --footer-link: #CBD5E1;
  --footer-link-hover: #FFFFFF;
  --nav-text: #17202A;
  --nav-text-hover: #0F4C81;
  --banner-text: #FFFFFF;
  --banner-sub: #E2E8F0;
  --code-bg: #F1F5F9;
  --code-text: #1E293B;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.55);
  --glass-blur: blur(16px) saturate(180%);
  --gradient-brand: linear-gradient(135deg, #0F4C81 0%, #1E6FB8 50%, #4A9EE0 100%);
  --gradient-accent: linear-gradient(135deg, #1E6FB8 0%, #4A9EE0 100%);
  --gradient-warm: linear-gradient(135deg, #0A2F4F 0%, #0F4C81 60%, #1E6FB8 100%);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-pill: 40px;
}

[data-theme="dark"] {
  --bg-body: #0F172A;
  --bg-card: #1E293B;
  --bg-nav: rgba(30, 41, 59, 0.82);
  --bg-footer: #020617;
  --bg-banner: #1E293B;
  --text-primary: #E5E7EB;
  --text-heading: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-link: #93C5FD;
  --text-link-hover: #BFDBFE;
  --text-btn: #0F172A;
  --bg-btn: #93C5FD;
  --bg-btn-hover: #BFDBFE;
  --border-light: #334155;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.4);
  --card-hover: 0 8px 24px rgba(0, 0, 0, 0.6);
  --banner-overlay: linear-gradient(135deg, rgba(2, 6, 23, 0.78) 0%, rgba(15, 23, 42, 0.62) 100%);
  --tag-bg: #334155;
  --tag-text: #E2E8F0;
  --faq-border: #334155;
  --input-bg: #1E293B;
  --input-border: #475569;
  --input-text: #E5E7EB;
  --input-placeholder: #94A3B8;
  --footer-text: #CBD5E1;
  --footer-heading: #FFFFFF;
  --footer-link: #94A3B8;
  --footer-link-hover: #FFFFFF;
  --nav-text: #E5E7EB;
  --nav-text-hover: #93C5FD;
  --banner-text: #FFFFFF;
  --banner-sub: #CBD5E1;
  --code-bg: #1E293B;
  --code-text: #E2E8F0;
  --glass-bg: rgba(30, 41, 59, 0.72);
  --glass-border: rgba(148, 163, 184, 0.22);
  --gradient-brand: linear-gradient(135deg, #1E3A5F 0%, #2563EB 50%, #60A5FA 100%);
  --gradient-accent: linear-gradient(135deg, #2563EB 0%, #60A5FA 100%);
  --gradient-warm: linear-gradient(135deg, #020617 0%, #1E3A5F 60%, #2563EB 100%);
}

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

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  line-height: 1.3;
  font-weight: 700;
}

p, li, span, div, td, th, label, input, textarea, select, button {
  color: var(--text-primary);
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-nav);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--glass-border);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  transition: transform 0.2s ease;
}

.nav-logo:hover {
  text-decoration: none;
  transform: scale(1.03);
}

.nav-logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}

.nav-menu a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--nav-text);
  transition: background-color 0.2s, color 0.2s, transform 0.2s;
}

.nav-menu a:hover {
  background-color: var(--tag-bg);
  color: var(--nav-text-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

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

.theme-toggle {
  background: var(--tag-bg);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.theme-toggle:hover {
  background: var(--border-light);
  color: var(--text-heading);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.mobile-menu-btn:hover {
  background: var(--tag-bg);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  background: var(--bg-nav);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  padding: 12px 20px 20px;
  border-top: 1px solid var(--border-light);
  animation: slideDown 0.3s ease;
}

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

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  padding: 12px 0;
  font-size: 1rem;
  color: var(--nav-text);
  border-bottom: 1px solid var(--border-light);
  transition: color 0.2s, padding-left 0.2s;
}

.mobile-menu a:hover {
  color: var(--nav-text-hover);
  padding-left: 6px;
  text-decoration: none;
}

.mobile-menu a:last-child {
  border-bottom: none;
}

.breadcrumb {
  padding: 16px 0 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-link);
}

.breadcrumb span {
  color: var(--text-muted);
  margin: 0 6px;
}

.banner {
  position: relative;
  background: var(--gradient-brand);
  background-size: 200% 200%;
  border-radius: var(--radius-lg);
  margin: 24px 0 40px;
  overflow: hidden;
  min-height: 320px;
  display: flex;
  align-items: center;
  box-shadow: 0 12px 40px rgba(15, 76, 129, 0.18);
  transition: background 0.3s ease, box-shadow 0.3s ease;
  animation: gradientShift 12s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 1;
  pointer-events: none;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 1;
  pointer-events: none;
}

.banner-slide {
  display: none;
  width: 100%;
  padding: 48px 40px;
  position: relative;
  z-index: 2;
}

.banner-slide.active {
  display: block;
  animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.banner-slide h1 {
  font-size: 2.5rem;
  color: var(--banner-text);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  margin-bottom: 12px;
  max-width: 700px;
}

.banner-slide p {
  font-size: 1.15rem;
  color: var(--banner-sub);
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
  max-width: 600px;
  margin-bottom: 24px;
}

.banner-slide .btn {
  background: rgba(255, 255, 255, 0.95);
  color: #0F4C81;
  padding: 12px 32px;
  border-radius: var(--radius-pill);
  font-size: 1rem;
  font-weight: 600;
  display: inline-block;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  border: none;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.banner-slide .btn:hover {
  background: #ffffff;
  transform: translateY(-3px);
  text-decoration: none;
  color: #0A2F4F;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
}

.banner-overlay {
  position: absolute;
  inset: 0;
  background: var(--banner-overlay);
  z-index: 1;
}

.banner-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}

.banner-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: background 0.3s, width 0.3s, border-radius 0.3s;
}

.banner-dots span.active {
  background: #ffffff;
  width: 28px;
  border-radius: var(--radius-pill);
}

.banner-dots span:hover {
  background: rgba(255, 255, 255, 0.8);
}

.search-section {
  margin: 32px 0;
}

.search-box {
  display: flex;
  max-width: 600px;
  margin: 0 auto;
  gap: 12px;
}

.search-box input {
  flex: 1;
  padding: 14px 20px;
  border: 2px solid var(--input-border);
  border-radius: var(--radius-pill);
  font-size: 1rem;
  background: var(--input-bg);
  color: var(--input-text);
  outline: none;
  transition: border-color 0.2s, background 0.3s, box-shadow 0.2s;
}

.search-box input::placeholder {
  color: var(--input-placeholder);
}

.search-box input:focus {
  border-color: var(--text-link);
  box-shadow: 0 0 0 4px rgba(15, 76, 129, 0.12);
}

.search-box button {
  padding: 14px 32px;
  background: var(--gradient-accent);
  color: var(--text-btn);
  border: none;
  border-radius: var(--radius-pill);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(15, 76, 129, 0.25);
}

.search-box button:hover {
  background: var(--bg-btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(15, 76, 129, 0.35);
}

.section-title {
  font-size: 2rem;
  color: var(--text-heading);
  margin-bottom: 8px;
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 56px;
  height: 4px;
  margin: 12px auto 0;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
}

.section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.05rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease, background 0.3s, border-color 0.3s;
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
  border-color: transparent;
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text-heading);
  transition: color 0.2s;
}

.card:hover h3 {
  color: var(--text-link);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card .tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 12px;
  transition: background 0.2s, color 0.2s;
}

.card:hover .tag {
  background: var(--gradient-accent);
  color: #ffffff;
}

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

.card ul li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--border-light);
}

.card ul li:last-child {
  border-bottom: none;
}

.card ul li a {
  font-size: 0.95rem;
  transition: padding-left 0.2s, color 0.2s;
  display: inline-block;
}

.card ul li a:hover {
  padding-left: 6px;
  text-decoration: none;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.article-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease, border-color 0.25s;
  position: relative;
}

.article-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
  border-color: transparent;
}

.article-item h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  transition: color 0.2s;
}

.article-item:hover h3 {
  color: var(--text-link);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.article-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  line-height: 1.6;
}

.article-item .read-more {
  font-weight: 600;
  color: var(--text-link);
  font-size: 0.95rem;
  display: inline-block;
  transition: transform 0.2s, color 0.2s;
}

.article-item .read-more:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
  transform: translateX(4px);
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--faq-border);
  overflow: hidden;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.25s, transform 0.25s;
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.faq-item.open {
  border-color: var(--text-link);
  box-shadow: 0 6px 20px rgba(15, 76, 129, 0.12);
}

.faq-question {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  transition: background 0.2s, color 0.2s;
  -webkit-user-select: none;
  user-select: none;
}

.faq-question:hover {
  background: var(--tag-bg);
  color: var(--text-link);
}

.faq-question .icon {
  font-size: 1.4rem;
  color: var(--text-link);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  background: var(--bg-card);
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 24px 20px;
}

.howto-steps {
  counter-reset: step;
  max-width: 800px;
  margin: 0 auto;
}

.howto-step {
  display: flex;
  gap: 20px;
  margin-bottom: 28px;
  background: var(--bg-card);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease, border-color 0.25s;
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--card-hover);
  border-color: var(--text-link);
}

.step-number {
  counter-increment: step;
  width: 44px;
  height: 44px;
  background: var(--gradient-accent);
  color: var(--text-btn);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(15, 76, 129, 0.25);
  transition: transform 0.25s ease;
}

.howto-step:hover .step-number {
  transform: scale(1.1) rotate(-6deg);
}

.step-content h4 {
  font-size: 1.1rem;
  margin-bottom: 6px;
  color: var(--text-heading);
}

.step-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px;
  margin: 40px 0;
  text-align: center;
}

.stat-item {
  background: var(--bg-card);
  padding: 28px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease, border-color 0.25s;
  position: relative;
  overflow: hidden;
}

.stat-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0.3);
  transition: transform 0.35s ease;
}

.stat-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
  border-color: transparent;
}

.stat-item:hover::after {
  transform: scaleX(1);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.2;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 6px;
}

.table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
}

th, td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
}

th {
  background: var(--tag-bg);
  color: var(--text-heading);
  font-weight: 600;
}

td {
  color: var(--text-primary);
}

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

tbody tr {
  transition: background 0.2s;
}

tbody tr:hover {
  background: var(--tag-bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.contact-item {
  background: var(--bg-card);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s ease, border-color 0.25s;
}

.contact-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-hover);
  border-color: var(--text-link);
}

.contact-item h4 {
  font-size: 1rem;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  word-break: break-all;
}

footer {
  background: var(--bg-footer);
  color: var(--footer-text);
  padding: 56px 0 32px;
  margin-top: 64px;
  transition: background 0.3s ease, color 0.3s ease;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

footer h4 {
  color: var(--footer-heading);
  font-size: 1.1rem;
  margin-bottom: 16px;
}

footer p, footer li, footer span {
  color: var(--footer-text);
  font-size: 0.9rem;
  line-height: 1.7;
}

footer a {
  color: var(--footer-link);
  transition: color 0.2s, padding-left 0.2s;
  display: inline-block;
}

footer a:hover {
  color: var(--footer-link-hover);
  text-decoration: underline;
  padding-left: 4px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 40px;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
}

.footer-grid ul li {
  margin-bottom: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--footer-text);
}

.footer-bottom p {
  margin-bottom: 6px;
}

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--gradient-accent);
  color: var(--text-btn);
  border: none;
  border-radius: 50%;
  font-size: 1.4rem;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(15, 76, 129, 0.35);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: background 0.2s, transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s;
}

.back-to-top.show {
  display: flex;
}

.back-to-top:hover {
  background: var(--bg-btn-hover);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 10px 28px rgba(15, 76, 129, 0.45);
}

.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid var(--text-link);
  outline-offset: 2px;
}

.table-wrap th {
  color: var(--text-heading);
}

.table-wrap td {
  color: var(--text-primary);
}

code, pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

.card, .article-item, .faq-item, .howto-step, .contact-item, .stat-item {
  color: var(--text-primary);
}

ul, ol {
  color: var(--text-primary);
}

strong, b {
  color: var(--text-heading);
  font-weight: 700;
}

::placeholder {
  color: var(--input-placeholder);
  opacity: 1;
}

::selection {
  background: var(--text-link);
  color: #ffffff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-link);
}

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

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .banner-slide h1 {
    font-size: 1.8rem;
  }

  .banner-slide p {
    font-size: 1rem;
  }

  .banner-slide {
    padding: 32px 24px;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .search-box {
    flex-direction: column;
  }

  .search-box button {
    width: 100%;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  .howto-step {
    flex-direction: column;
    gap: 12px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .banner {
    border-radius: var(--radius-md);
    min-height: 280px;
  }

  .banner-slide h1 {
    font-size: 1.5rem;
  }

  .banner-slide p {
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .article-list {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .nav-logo {
    font-size: 1.3rem;
  }

  .theme-toggle {
    padding: 5px 10px;
    font-size: 0.78rem;
  }
}