:root {
  --color-bg: #0f0f1a;
  --color-bg-alt: #16162a;
  --color-surface: rgba(30, 30, 55, 0.65);
  --color-surface-solid: #1e1e37;
  --color-surface-hover: rgba(40, 40, 70, 0.8);
  --color-primary: #f0c040;
  --color-primary-dim: rgba(240, 192, 64, 0.15);
  --color-primary-glow: rgba(240, 192, 64, 0.35);
  --color-secondary: #6c5ce7;
  --color-secondary-dim: rgba(108, 92, 231, 0.15);
  --color-accent: #00cec9;
  --color-text: #e8e8f0;
  --color-text-secondary: #a0a0b8;
  --color-text-muted: #6c6c88;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(240, 192, 64, 0.3);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #2d3561 40%, #1a1a3e 70%, #0f0f1a 100%);
  --gradient-primary: linear-gradient(135deg, #f0c040 0%, #e8a020 100%);
  --gradient-card: linear-gradient(145deg, rgba(30, 30, 55, 0.8) 0%, rgba(20, 20, 40, 0.6) 100%);
  --gradient-accent: linear-gradient(135deg, #6c5ce7 0%, #00cec9 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(240, 192, 64, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --blur: 16px;
  --transition-fast: 0.2s ease;
  --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;
}

[data-theme="light"] {
  --color-bg: #f5f5fa;
  --color-bg-alt: #eeeef5;
  --color-surface: rgba(255, 255, 255, 0.7);
  --color-surface-solid: #ffffff;
  --color-surface-hover: rgba(255, 255, 255, 0.9);
  --color-primary: #d4a017;
  --color-primary-dim: rgba(212, 160, 23, 0.12);
  --color-primary-glow: rgba(212, 160, 23, 0.25);
  --color-secondary: #5b4bc4;
  --color-secondary-dim: rgba(91, 75, 196, 0.1);
  --color-accent: #00a8a4;
  --color-text: #1a1a2e;
  --color-text-secondary: #4a4a6a;
  --color-text-muted: #8888a0;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-hover: rgba(212, 160, 23, 0.3);
  --gradient-hero: linear-gradient(135deg, #e8e8f5 0%, #d8d8f0 40%, #e0e0f5 70%, #f5f5fa 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(245, 245, 250, 0.7) 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(212, 160, 23, 0.1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  font-size: 16px;
  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(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  font-weight: 700;
  color: var(--color-text);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: 1.5rem; position: relative; padding-bottom: 0.75rem; }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.35rem); margin-bottom: 0.75rem; }
h4 { font-size: clamp(1rem, 1.8vw, 1.15rem); margin-bottom: 0.5rem; color: var(--color-primary); }

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

strong {
  color: var(--color-text);
  font-weight: 600;
}

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

header#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
  text-decoration: none;
}

.logo svg {
  transition: transform var(--transition-base);
}

.logo:hover svg {
  transform: rotate(-10deg) scale(1.08);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

nav#main-nav {
  flex: 1;
}

nav#main-nav ul {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

nav#main-nav a {
  display: block;
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

nav#main-nav a:hover {
  color: var(--color-primary);
  background: var(--color-primary-dim);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

#search-form {
  display: flex;
  align-items: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#search-form:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-dim);
}

#search-form input {
  background: transparent;
  border: none;
  outline: none;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  color: var(--color-text);
  width: 160px;
  font-family: inherit;
}

#search-form input::placeholder {
  color: var(--color-text-muted);
}

#search-form button {
  background: var(--gradient-primary);
  border: none;
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #1a1a2e;
  cursor: pointer;
  transition: opacity var(--transition-fast);
  font-family: inherit;
}

#search-form button:hover {
  opacity: 0.85;
}

#theme-toggle,
#menu-toggle {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
  color: var(--color-text);
}

#theme-toggle:hover,
#menu-toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
  transform: scale(1.08);
}

#menu-toggle {
  display: none;
}

main {
  padding-top: 72px;
}

section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

section.revealed {
  opacity: 1;
  transform: translateY(0);
}

#hero {
  max-width: 100%;
  padding: 0;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  opacity: 1;
  transform: none;
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatGlow 8s ease-in-out infinite;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-secondary-dim) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem 1.5rem 2rem;
  position: relative;
  z-index: 2;
}

.hero-content h1 {
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease both;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease 0.15s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  font-family: inherit;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #1a1a2e;
  box-shadow: 0 4px 20px rgba(240, 192, 64, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(240, 192, 64, 0.45);
  color: #1a1a2e;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
  transform: translateY(-3px);
  color: var(--color-primary);
}

.hero-visual {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  position: relative;
  z-index: 2;
}

.banner-slide {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  transition: transform var(--transition-slow);
}

.banner-slide:hover {
  transform: scale(1.015);
}

.banner-slide svg {
  width: 100%;
  height: auto;
  display: block;
}

.slide-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem 2rem;
  background: linear-gradient(transparent, rgba(15, 15, 26, 0.85));
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0;
}

#breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  opacity: 1;
  transform: none;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.85rem;
}

#breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
}

#breadcrumb li:not(:last-child)::after {
  content: '/';
  color: var(--color-text-muted);
  opacity: 0.5;
}

#breadcrumb a {
  color: var(--color-text-secondary);
}

#breadcrumb a:hover {
  color: var(--color-primary);
}

#breadcrumb [aria-current="page"] {
  color: var(--color-primary);
  font-weight: 500;
}

article {
  background: var(--gradient-card);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

article:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

#products article,
#solutions article,
#cases article,
#testimonials article,
#news article,
#articles article,
#knowledge article {
  position: relative;
  overflow: hidden;
}

#products article::before,
#solutions article::before,
#cases article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--gradient-primary);
  border-radius: 0 0 4px 0;
  transition: height var(--transition-slow);
}

#products article:hover::before,
#solutions article:hover::before,
#cases article:hover::before {
  height: 100%;
}

#products h4 {
  margin-top: 1rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-primary);
}

#advantages article {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  background: none;
  backdrop-filter: none;
  border: none;
  padding: 0;
}

#advantages article:hover {
  transform: none;
  box-shadow: none;
  border: none;
}

#advantages h3 {
  background: var(--gradient-card);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.5rem 0.5rem;
  margin-bottom: 0;
  transition: all var(--transition-base);
}

#advantages h3:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-glow);
}

#advantages p {
  background: var(--gradient-card);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  padding: 0 1.5rem 1.5rem;
  margin-bottom: 1.5rem;
  transition: all var(--transition-base);
}

#advantages p:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-glow);
}

#testimonials article {
  border-left: 3px solid var(--color-secondary);
  background: linear-gradient(145deg, var(--color-secondary-dim) 0%, var(--gradient-card) 100%);
}

#testimonials h3 {
  color: var(--color-secondary);
  font-size: 1rem;
}

#testimonials p {
  font-style: italic;
  color: var(--color-text-secondary);
  position: relative;
  padding-left: 1.5rem;
}

#testimonials p::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -0.5rem;
  font-size: 2.5rem;
  color: var(--color-secondary);
  opacity: 0.4;
  font-family: Georgia, serif;
  line-height: 1;
}

#news article {
  border-left: 3px solid var(--color-accent);
}

#news h3 {
  color: var(--color-accent);
}

#news a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 0.5rem;
  transition: gap var(--transition-fast);
}

#news a:hover {
  gap: 0.6rem;
}

#news a::after {
  content: '→';
  transition: transform var(--transition-fast);
}

#news a:hover::after {
  transform: translateX(3px);
}

#articles article {
  border-left: 3px solid var(--color-primary);
}

#articles time {
  display: inline-block;
  margin-bottom: 0.5rem;
}

#articles a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 0.5rem;
  transition: gap var(--transition-fast);
}

#articles a:hover {
  gap: 0.6rem;
}

#articles a::after {
  content: '→';
  transition: transform var(--transition-fast);
}

#articles a:hover::after {
  transform: translateX(3px);
}

#howto article {
  border-left: 3px solid var(--color-accent);
}

#howto ol {
  counter-reset: step-counter;
  padding-left: 0;
}

#howto ol li {
  counter-increment: step-counter;
  position: relative;
  padding: 1rem 1rem 1rem 3.5rem;
  margin-bottom: 0.75rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

#howto ol li:hover {
  border-color: var(--color-border-hover);
  transform: translateX(4px);
}

#howto ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #1a1a2e;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 50%;
}

#faq details {
  background: var(--gradient-card);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

#faq details:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-sm);
}

#faq details[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

#faq summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: color var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: '+';
  font-size: 1.35rem;
  font-weight: 300;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition-base);
  line-height: 1;
}

#faq details[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

#faq summary:hover {
  color: var(--color-primary);
}

#faq details p {
  padding: 0 1.25rem 1.25rem;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  animation: fadeInUp 0.3s ease;
}

#contact ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

#contact li {
  padding: 0.75rem 1rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

#contact li:hover {
  border-color: var(--color-border-hover);
  color: var(--color-text);
  transform: translateY(-2px);
}

#sitemap nav ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
}

#sitemap a {
  display: block;
  padding: 0.5rem 0.75rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

#sitemap a:hover {
  border-color: var(--color-border-hover);
  color: var(--color-primary);
  background: var(--color-primary-dim);
  transform: translateX(4px);
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

#links a {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
}

#links a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

footer#site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2rem;
}

.footer-brand svg {
  margin-bottom: 1rem;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}

.footer-brand p:first-of-type {
  color: var(--color-text-secondary);
  font-weight: 600;
}

.footer-links h3,
.footer-contact h3 {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-links h3::after,
.footer-contact h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.footer-links a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.footer-contact p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.footer-legal h3 {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.footer-legal p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

.footer-meta {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-meta p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}

#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #1a1a2e;
  border: none;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md), 0 0 20px rgba(240, 192, 64, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 999;
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(240, 192, 64, 0.5);
}

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  html {
    scroll-padding-top: 64px;
  }

  .header-inner {
    padding: 0.6rem 1rem;
    gap: 0.75rem;
  }

  .logo-text {
    font-size: 1.05rem;
  }

  #menu-toggle {
    display: flex;
  }

  nav#main-nav {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border-bottom: 1px solid var(--color-border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
    z-index: 999;
  }

  nav#main-nav.open {
    max-height: 500px;
    padding: 1rem 0;
    overflow-y: auto;
  }

  nav#main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0 1rem;
  }

  nav#main-nav a {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

  #search-form input {
    width: 100px;
    font-size: 0.8rem;
  }

  #search-form button {
    padding: 0.4rem 0.6rem;
    font-size: 0.75rem;
  }

  main {
    padding-top: 56px;
  }

  .hero-content {
    padding: 3rem 1rem 1.5rem;
  }

  .hero-visual {
    padding: 0 1rem 2rem;
  }

  section {
    padding: 2rem 1rem;
  }

  h2 {
    margin-bottom: 1.25rem;
  }

  article {
    padding: 1.25rem;
  }

  #advantages article {
    grid-template-columns: 1fr;
  }

  #contact ul {
    grid-template-columns: 1fr;
  }

  #sitemap nav ul {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 2rem 1rem 1.5rem;
  }

  .footer-bottom {
    padding: 1.5rem 1rem;
    grid-template-columns: 1fr;
  }

  #back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    text-align: center;
  }

  .header-actions {
    gap: 0.35rem;
  }

  #search-form {
    display: none;
  }

  #search-form.mobile-visible {
    display: flex;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    border-radius: 0;
    background: var(--color-surface);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  #search-form.mobile-visible input {
    width: 100%;
  }

  #howto ol li {
    padding-left: 3rem;
  }

  #howto ol li::before {
    width: 1.75rem;
    height: 1.75rem;
    font-size: 0.75rem;
  }
}

@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;
  }

  section {
    opacity: 1;
    transform: none;
  }
}

::selection {
  background: var(--color-primary);
  color: #1a1a2e;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-surface-solid);
  border-radius: 4px;
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

@media print {
  header#site-header,
  #back-to-top,
  #menu-toggle,
  #theme-toggle,
  #search-form {
    display: none;
  }

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

  section {
    opacity: 1;
    transform: none;
    page-break-inside: avoid;
  }
}