:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-card: rgba(43, 58, 103, 0.35);
  --bg-card-hover: rgba(74, 108, 247, 0.12);
  --bg-glass: rgba(26, 26, 46, 0.72);
  --bg-glass-border: rgba(74, 108, 247, 0.18);
  --text-primary: #eaeaf5;
  --text-secondary: #a8aec7;
  --text-muted: #6c7293;
  --accent: #4a6cf7;
  --accent-hover: #6b88ff;
  --accent-soft: rgba(74, 108, 247, 0.15);
  --accent-glow: rgba(74, 108, 247, 0.35);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #2b3a67 40%, #4a6cf7 100%);
  --gradient-accent: linear-gradient(135deg, #4a6cf7, #7b5ea7);
  --gradient-card: linear-gradient(145deg, rgba(43, 58, 103, 0.4), rgba(26, 26, 46, 0.6));
  --border-radius-sm: 8px;
  --border-radius-md: 14px;
  --border-radius-lg: 20px;
  --border-radius-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 32px rgba(74, 108, 247, 0.25);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1200px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f4f6fc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef1f9;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-card-hover: rgba(74, 108, 247, 0.08);
    --bg-glass: rgba(255, 255, 255, 0.78);
    --bg-glass-border: rgba(74, 108, 247, 0.14);
    --text-primary: #1a1a2e;
    --text-secondary: #4a5068;
    --text-muted: #8890a8;
    --accent: #3a5bd9;
    --accent-hover: #2b4ac4;
    --accent-soft: rgba(58, 91, 217, 0.1);
    --accent-glow: rgba(58, 91, 217, 0.22);
    --gradient-hero: linear-gradient(135deg, #eef1f9 0%, #dce3f5 40%, #b8c6f0 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.85), rgba(238, 241, 249, 0.7));
    --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.08);
    --shadow-md: 0 6px 24px rgba(26, 26, 46, 0.1);
    --shadow-lg: 0 12px 48px rgba(26, 26, 46, 0.12);
    --shadow-glow: 0 0 32px rgba(58, 91, 217, 0.12);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

ul, ol {
  list-style: none;
}

address {
  font-style: normal;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
  color: #fff;
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

#site-header:hover {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.brand-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-sm);
  transition: transform var(--transition-base), filter var(--transition-base);
}

.brand:hover .brand-logo {
  transform: rotate(-8deg) scale(1.08);
  filter: drop-shadow(0 0 12px var(--accent-glow));
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand-slogan {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  font-weight: 500;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--border-radius-sm);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.main-nav a:hover {
  color: var(--text-primary);
  background: var(--accent-soft);
}

.main-nav a:hover::after {
  width: 60%;
}

.menu-toggle {
  display: none;
  padding: 8px 18px;
  background: var(--accent-soft);
  color: var(--text-primary);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.04);
}

.menu-toggle:active {
  transform: scale(0.97);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

.hero {
  margin: 32px 0 40px;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  position: relative;
  background: var(--gradient-hero);
  box-shadow: var(--shadow-lg);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 85%, rgba(74, 108, 247, 0.25), transparent 55%),
    radial-gradient(circle at 85% 15%, rgba(123, 94, 167, 0.2), transparent 50%);
  pointer-events: none;
}

.hero-slider {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  position: relative;
  z-index: 1;
}

.hero-slider::-webkit-scrollbar {
  display: none;
}

.slide {
  flex: 0 0 100%;
  scroll-snap-align: start;
  padding: 64px 48px;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  animation: fadeSlideUp 0.7s ease-out both;
}

.slide:nth-child(2) {
  animation-delay: 0.12s;
}

.slide:nth-child(3) {
  animation-delay: 0.24s;
}

.slide h2 {
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: #ffffff;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.25);
}

.slide p {
  font-size: clamp(0.9rem, 1.6vw, 1.05rem);
  color: rgba(255, 255, 255, 0.82);
  max-width: 720px;
  line-height: 1.8;
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.breadcrumb {
  margin: 0 0 40px;
  padding: 14px 22px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.breadcrumb li + li::before {
  content: "›";
  color: var(--text-muted);
  font-size: 1rem;
  margin-right: 2px;
}

.breadcrumb a {
  color: var(--text-secondary);
  font-weight: 500;
}

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

.breadcrumb [aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

main > section:not(.hero):not(.breadcrumb) {
  margin-bottom: 56px;
  padding: 40px 36px;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base);
  animation: revealUp 0.65s ease-out both;
}

main > section:not(.hero):not(.breadcrumb):hover {
  box-shadow: var(--shadow-md), var(--shadow-glow);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

@keyframes revealUp {
  from {
    opacity: 0;
    transform: translateY(36px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main > section h2 {
  font-size: clamp(1.25rem, 2.6vw, 1.65rem);
  font-weight: 800;
  margin-bottom: 20px;
  padding-bottom: 14px;
  position: relative;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

main > section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 3px;
  transition: width var(--transition-base);
}

main > section:hover h2::after {
  width: 96px;
}

main > section h3 {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text-primary);
  letter-spacing: -0.005em;
}

main > section h3:first-of-type {
  margin-top: 8px;
}

main > section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--accent);
}

main > section p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.95rem;
  line-height: 1.85;
}

main > section ul,
main > section ol {
  margin: 12px 0 20px;
  padding-left: 4px;
}

main > section ul li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.75;
}

main > section ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

main > section ol {
  counter-reset: step-counter;
  padding-left: 0;
}

main > section ol li {
  position: relative;
  padding-left: 44px;
  margin-bottom: 14px;
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.75;
  counter-increment: step-counter;
}

main > section ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.78rem;
  font-weight: 700;
  box-shadow: 0 2px 10px var(--accent-glow);
}

main > section article {
  padding: 22px 24px;
  margin-bottom: 16px;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  position: relative;
  overflow: hidden;
}

main > section article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

main > section article:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--bg-glass-border);
  background: var(--bg-card-hover);
}

main > section article:hover::before {
  opacity: 1;
}

main > section article h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.08rem;
}

main > section article p {
  margin-bottom: 8px;
}

main > section article p:first-of-type {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

main > section article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

main > section article a::after {
  content: "→";
  transition: transform var(--transition-fast);
}

main > section article a:hover {
  gap: 10px;
  color: var(--accent-hover);
}

main > section article a:hover::after {
  transform: translateX(3px);
}

details {
  margin-bottom: 12px;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

details:hover {
  border-color: var(--bg-glass-border);
  box-shadow: var(--shadow-sm);
}

details[open] {
  border-color: var(--accent-soft);
  box-shadow: var(--shadow-sm);
  background: var(--bg-card-hover);
}

summary {
  padding: 16px 22px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1;
  transition: transform var(--transition-base), background var(--transition-fast), color var(--transition-fast);
}

details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
  background: var(--accent);
  color: #fff;
}

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

summary:hover::after {
  background: var(--accent);
  color: #fff;
}

details > p {
  padding: 0 22px 18px;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

blockquote {
  position: relative;
  margin: 16px 0;
  padding: 20px 24px 20px 52px;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  border-left: 3px solid var(--accent);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 8px;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.4;
  font-family: Georgia, serif;
}

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

blockquote p {
  margin: 0;
  font-size: 0.9rem !important;
  color: var(--text-secondary) !important;
  font-style: italic;
}

#search form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  margin-bottom: 16px;
}

#search label {
  display: block;
  width: 100%;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

#search input[type="search"] {
  flex: 1 1 260px;
  padding: 13px 20px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1.5px solid var(--bg-glass-border);
  border-radius: var(--border-radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#search input[type="search"]::placeholder {
  color: var(--text-muted);
}

#search input[type="search"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft), var(--shadow-glow);
  background: var(--bg-card);
}

#search button[type="submit"] {
  padding: 13px 32px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: inherit;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-base), filter var(--transition-fast);
  white-space: nowrap;
}

#search button[type="submit"]::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 30%, rgba(255, 255, 255, 0.2) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.55s ease;
}

#search button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
  filter: brightness(1.1);
}

#search button[type="submit"]:hover::before {
  transform: translateX(100%);
}

#search button[type="submit"]:active {
  transform: translateY(0) scale(0.98);
}

#images figure {
  margin: 20px 0;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#images figure:hover {
  transform: scale(1.015);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

#images svg {
  width: 100%;
  height: auto;
  display: block;
}

#images figcaption {
  padding: 14px 22px;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  text-align: center;
  font-weight: 500;
}

#banner ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

#banner ul li {
  padding: 22px 20px;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

#banner ul li::before {
  display: none;
}

#banner ul li::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 0;
}

#banner ul li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

#banner ul li:hover::after {
  opacity: 0.08;
}

#back-to-top {
  text-align: center;
  padding: 28px 36px !important;
}

#back-to-top a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: var(--accent-soft);
  border: 1.5px solid var(--accent);
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-base);
}

#back-to-top a::before {
  content: "↑";
  font-size: 1.1rem;
}

#back-to-top a:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--accent-glow);
}

footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--bg-glass-border);
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 36px;
}

.footer-inner section {
  animation: revealUp 0.6s ease-out both;
}

.footer-inner section h2 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 10px;
}

.footer-inner section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.footer-inner section p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.footer-inner section ul li {
  margin-bottom: 10px;
}

.footer-inner section ul a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.footer-inner section ul a:hover {
  color: var(--accent);
  padding-left: 6px;
}

.footer-inner address p {
  margin-bottom: 8px;
  font-size: 0.83rem;
  color: var(--text-muted);
}

.copyright {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 28px;
  margin-top: 8px;
  border-top: 1px solid var(--bg-glass-border);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

@media (max-width: 1024px) {
  .main-nav ul {
    gap: 2px;
  }

  .main-nav a {
    padding: 7px 10px;
    font-size: 0.82rem;
  }

  .slide {
    padding: 48px 36px;
  }
}

@media (max-width: 860px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--bg-glass-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
    box-shadow: var(--shadow-lg);
  }

  .main-nav.open {
    max-height: 600px;
    padding: 12px 0;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0 20px;
    gap: 2px;
  }

  .main-nav a {
    padding: 13px 16px;
    font-size: 0.92rem;
    border-radius: var(--border-radius-sm);
  }

  .main-nav a::after {
    display: none;
  }

  .header-inner {
    padding: 10px 18px;
  }

  main {
    padding: 0 16px 60px;
  }

  main > section:not(.hero):not(.breadcrumb) {
    padding: 28px 22px;
    margin-bottom: 40px;
    border-radius: var(--border-radius-md);
  }

  .hero {
    margin: 20px 0 28px;
    border-radius: var(--border-radius-lg);
  }

  .slide {
    padding: 40px 26px;
    min-height: 260px;
  }

  .slide h2 {
    font-size: 1.25rem;
  }

  .slide p {
    font-size: 0.88rem;
  }

  .breadcrumb {
    padding: 12px 16px;
    margin-bottom: 28px;
  }

  .footer-inner {
    padding: 40px 18px 24px;
    gap: 28px;
  }

  #banner ul {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
  }

  #banner ul li {
    padding: 18px 14px;
    font-size: 0.84rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .brand-slogan {
    font-size: 0.62rem;
  }

  .brand-logo {
    width: 40px;
    height: 40px;
  }

  .slide {
    padding: 32px 20px;
    min-height: 230px;
  }

  .slide h2 {
    font-size: 1.12rem;
  }

  .slide p {
    font-size: 0.84rem;
  }

  main > section:not(.hero):not(.breadcrumb) {
    padding: 24px 18px;
    margin-bottom: 32px;
  }

  main > section h2 {
    font-size: 1.15rem;
  }

  main > section article {
    padding: 18px 16px;
  }

  summary {
    padding: 14px 16px;
    font-size: 0.9rem;
  }

  details > p {
    padding: 0 16px 16px;
    font-size: 0.86rem;
  }

  blockquote {
    padding: 16px 18px 16px 44px;
  }

  #search form {
    flex-direction: column;
    align-items: stretch;
  }

  #search input[type="search"],
  #search button[type="submit"] {
    width: 100%;
    flex: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 20px;
  }

  .breadcrumb ol {
    font-size: 0.76rem;
  }
}

@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 print {
  #site-header,
  .menu-toggle,
  #back-to-top,
  footer {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  main > section {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
    backdrop-filter: none;
  }
}