:root {
  --color-primary: #2b6cb0;
  --color-primary-dark: #1a365d;
  --color-primary-light: #63b3ed;
  --color-accent: #ed8936;
  --color-accent-hover: #dd6b20;
  --color-bg: #f7fafc;
  --color-bg-alt: #edf2f7;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-text: #1a202c;
  --color-text-secondary: #4a5568;
  --color-text-muted: #718096;
  --color-border: #e2e8f0;
  --color-border-glass: rgba(255, 255, 255, 0.3);
  --color-shadow: rgba(43, 108, 176, 0.12);
  --color-shadow-lg: rgba(43, 108, 176, 0.2);
  --gradient-hero: linear-gradient(135deg, #1a365d 0%, #2b6cb0 40%, #4299e1 70%, #63b3ed 100%);
  --gradient-accent: linear-gradient(135deg, #ed8936 0%, #f6ad55 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(237,242,247,0.9));
  --gradient-banner-0: linear-gradient(135deg, #2b6cb0, #63b3ed);
  --gradient-banner-1: linear-gradient(135deg, #2c5282, #90cdf4);
  --gradient-banner-2: linear-gradient(135deg, #1a365d, #4299e1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --radius-pill: 999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --header-height: 72px;
  --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);
  --max-width: 1200px;
}

[data-theme="dark"] {
  --color-primary: #63b3ed;
  --color-primary-dark: #90cdf4;
  --color-primary-light: #4299e1;
  --color-accent: #f6ad55;
  --color-accent-hover: #ed8936;
  --color-bg: #0d1117;
  --color-bg-alt: #161b22;
  --color-surface: #1c2128;
  --color-surface-glass: rgba(28, 33, 40, 0.78);
  --color-text: #e6edf3;
  --color-text-secondary: #b1bac4;
  --color-text-muted: #8b949e;
  --color-border: #30363d;
  --color-border-glass: rgba(255, 255, 255, 0.08);
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-shadow-lg: rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0d1117 0%, #161b22 40%, #1a365d 70%, #2b6cb0 100%);
  --gradient-card: linear-gradient(145deg, rgba(28,33,40,0.95), rgba(22,27,34,0.9));
  --gradient-banner-0: linear-gradient(135deg, #1a365d, #2b6cb0);
  --gradient-banner-1: linear-gradient(135deg, #2b6cb0, #4299e1);
  --gradient-banner-2: linear-gradient(135deg, #0d1117, #2c5282);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

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

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(99, 179, 237, 0.14), transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 20%, rgba(237, 137, 54, 0.08), transparent 55%),
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(43, 108, 176, 0.1), transparent 60%);
  pointer-events: none;
  z-index: -1;
  transition: opacity var(--transition-base);
}

[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(43, 108, 176, 0.18), transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 20%, rgba(237, 137, 54, 0.06), transparent 55%),
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(26, 54, 93, 0.2), transparent 60%);
}

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);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.75rem, 4.5vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: 1rem; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); margin-bottom: 0.75rem; }

p { margin-bottom: 1rem; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-surface-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--color-border-glass);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#site-header.is-scrolled {
  box-shadow: 0 8px 32px var(--color-shadow);
  background: var(--color-surface-glass);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(43, 108, 176, 0.35);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.brand:hover .brand-logo {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 6px 22px rgba(43, 108, 176, 0.5);
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

[data-theme="dark"] .brand-name {
  background: linear-gradient(135deg, #63b3ed, #90cdf4, #f6ad55);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

#main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

#main-nav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  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(--color-primary);
  background: rgba(43, 108, 176, 0.08);
  transform: translateY(-1px);
}

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

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

#site-search {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#site-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(43, 108, 176, 0.15);
  background: var(--color-surface);
}

#search-input {
  border: none;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.85rem;
  color: var(--color-text);
  width: 180px;
  outline: none;
  transition: width var(--transition-base);
}

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

#search-input:focus {
  width: 220px;
}

#site-search button {
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border-radius: 0;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#site-search button:hover {
  background: var(--color-primary-dark);
}

#site-search button:active {
  transform: scale(0.96);
}

#theme-toggle,
#menu-toggle {
  padding: 9px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

#theme-toggle:hover,
#menu-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(43, 108, 176, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px var(--color-shadow);
}

#menu-toggle {
  display: none;
}

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

.breadcrumb {
  padding: 20px 0 8px;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-border);
  font-weight: 300;
}

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

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

#hero {
  position: relative;
  padding: 48px 0 40px;
  text-align: center;
  border-radius: var(--radius-xl);
  margin: 16px 0 40px;
  overflow: hidden;
  background: var(--gradient-hero);
  background-size: 200% 200%;
  animation: gradientShift 14s ease infinite;
  box-shadow: 0 20px 60px var(--color-shadow-lg);
}

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

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 25%, rgba(255,255,255,0.18), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(255,255,255,0.1), transparent 40%);
  pointer-events: none;
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  color: #fff;
  padding: 0 28px;
  margin-bottom: 18px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.25);
  animation: fadeInUp 0.8s ease both;
}

.hero-lead {
  max-width: 860px;
  margin: 0 auto 32px;
  padding: 0 28px;
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  text-align: left;
  animation: fadeInUp 0.8s ease 0.15s both;
}

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

.hero-banner {
  position: relative;
  max-width: 880px;
  margin: 0 auto 36px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: fadeInUp 0.8s ease 0.25s both;
}

.banner-slide {
  display: none;
  position: relative;
}

.banner-slide.is-active {
  display: block;
  animation: slideFade 0.6s ease both;
}

@keyframes slideFade {
  from { opacity: 0; transform: scale(1.03); }
  to { opacity: 1; transform: scale(1); }
}

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

.banner-slide p {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0;
  padding: 20px 24px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
  color: #fff;
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  font-weight: 600;
  text-align: left;
}

.banner-prev,
.banner-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--color-primary-dark);
  font-size: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  transition: all var(--transition-fast);
}

.banner-prev::before,
.banner-next::before {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
}

.banner-prev::before { content: "‹"; }
.banner-next::before { content: "›"; }

.banner-prev { left: 14px; }
.banner-next { right: 14px; }

.banner-prev:hover,
.banner-next:hover {
  background: #fff;
  transform: translateY(-50%) scale(1.12);
  box-shadow: 0 6px 22px rgba(0,0,0,0.35);
}

.banner-prev:active,
.banner-next:active {
  transform: translateY(-50%) scale(0.95);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 880px;
  margin: 0 auto;
  padding: 0 28px;
  animation: fadeInUp 0.8s ease 0.35s both;
}

.stat-item {
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-md);
  padding: 20px 12px;
  transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.22);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.stat-number {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 4px;
}

#toc {
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--color-border-glass);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 48px;
  box-shadow: 0 8px 32px var(--color-shadow);
  transition: background var(--transition-base), border-color var(--transition-base);
}

#toc h2 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

#toc h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

#toc ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#toc a {
  display: inline-block;
  padding: 7px 16px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}

#toc a:hover {
  color: #fff;
  background: var(--gradient-banner-0);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--color-shadow);
}

main > section:not(#hero):not(#toc) {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  margin-bottom: 36px;
  box-shadow: 0 4px 24px var(--color-shadow);
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease, background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

main > section:not(#hero):not(#toc).is-visible {
  opacity: 1;
  transform: translateY(0);
}

main > section:not(#hero):not(#toc):hover {
  box-shadow: 0 12px 40px var(--color-shadow-lg);
}

main > section:not(#hero):not(#toc) > h2 {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 22px;
}

main > section:not(#hero):not(#toc) > h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: width var(--transition-slow);
}

main > section:not(#hero):not(#toc):hover > h2::after {
  width: 120px;
}

#about p,
#history p,
#culture p,
#applications p {
  color: var(--color-text-secondary);
  text-align: justify;
}

#products h3,
#advantages h3,
#solutions h3,
#knowledge h3,
#howto h3 {
  color: var(--color-primary);
  margin-top: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--color-primary);
  transition: border-color var(--transition-fast), padding-left var(--transition-fast);
}

#products h3:hover,
#advantages h3:hover,
#solutions h3:hover,
#knowledge h3:hover,
#howto h3:hover {
  border-color: var(--color-accent);
  padding-left: 20px;
}

#advantages h3:first-of-type,
#solutions h3:first-of-type {
  margin-top: 0;
}

#cases article,
#news article,
#articles article {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#cases article::before,
#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-base);
}

#cases article:hover,
#news article:hover,
#articles article:hover {
  transform: translateY(-4px) translateX(4px);
  box-shadow: 0 12px 36px var(--color-shadow-lg);
  border-color: var(--color-primary-light);
}

#cases article:hover::before,
#news article:hover::before,
#articles article:hover::before {
  transform: scaleY(1);
}

#cases h3,
#news h3,
#articles h3 {
  color: var(--color-primary);
  margin-bottom: 8px;
  transition: color var(--transition-fast);
}

#cases article:hover h3,
#news article:hover h3,
#articles article:hover h3 {
  color: var(--color-accent);
}

#news time,
#articles time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
}

#articles a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 6px;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

#articles a:hover {
  gap: 10px;
  color: var(--color-accent);
}

#articles a:hover::after {
  transform: translateX(4px);
}

#reviews blockquote {
  position: relative;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-left: 5px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 22px 26px 22px 52px;
  margin-bottom: 16px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#reviews blockquote::before {
  content: "\201C";
  position: absolute;
  top: 8px;
  left: 16px;
  font-size: 3rem;
  line-height: 1;
  color: var(--color-primary-light);
  opacity: 0.5;
  font-family: Georgia, serif;
}

#reviews blockquote:hover {
  transform: translateX(8px);
  border-left-color: var(--color-accent);
  box-shadow: 0 10px 30px var(--color-shadow-lg);
}

#reviews blockquote p {
  margin: 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

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

#faq details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 8px 28px var(--color-shadow);
  background: var(--color-surface);
}

#faq summary {
  padding: 18px 50px 18px 22px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  list-style: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--color-primary);
  transition: transform var(--transition-base), color var(--transition-fast);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  color: var(--color-accent);
}

#faq summary:hover {
  color: var(--color-primary);
  background: rgba(43, 108, 176, 0.06);
}

#faq details p {
  padding: 0 22px 20px;
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  animation: fadeInUp 0.35s ease both;
}

#howto ol {
  counter-reset: howto-step;
  list-style: none;
  padding-left: 0;
  margin: 16px 0;
}

#howto ol li {
  counter-increment: howto-step;
  position: relative;
  padding: 16px 20px 16px 64px;
  margin-bottom: 12px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#howto ol li::before {
  content: counter(howto-step);
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-banner-0);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 50%;
  box-shadow: 0 4px 12px var(--color-shadow);
}

#howto ol li:hover {
  transform: translateX(6px);
  border-color: var(--color-primary-light);
  box-shadow: 0 8px 24px var(--color-shadow);
}

#contact address {
  font-style: normal;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 24px;
}

#contact address p {
  margin-bottom: 10px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

#contact address p:last-child {
  margin-bottom: 0;
}

#contact a {
  font-weight: 600;
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

#sitemap a,
#links a {
  display: block;
  padding: 10px 16px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: all var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--gradient-banner-0);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 22px var(--color-shadow);
}

footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 48px 24px 32px;
  transition: background var(--transition-base), border-color var(--transition-base);
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 32px;
  padding: 0 0 32px;
  border-bottom: 1px solid var(--color-border);
}

footer h2 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

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

footer h3 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-top: 20px;
  margin-bottom: 8px;
}

footer p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.copyright {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  padding-top: 8px;
}

#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient-banner-0);
  color: #fff;
  font-size: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  box-shadow: 0 8px 28px var(--color-shadow-lg);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

#back-to-top::before {
  content: "↑";
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
}

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

#back-to-top:hover {
  transform: translateY(-6px) scale(1.08);
  box-shadow: 0 14px 40px var(--color-shadow-lg);
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.96);
}

@media (max-width: 1024px) {
  #main-nav a {
    padding: 8px 10px;
    font-size: 0.82rem;
  }
  #search-input {
    width: 140px;
  }
  #search-input:focus {
    width: 170px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 64px;
  }

  #menu-toggle {
    display: block;
  }

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border-glass);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-base);
    box-shadow: 0 16px 40px var(--color-shadow);
  }

  #main-nav.is-open {
    max-height: 520px;
    padding: 16px 0;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 0 24px;
  }

  #main-nav a {
    padding: 12px 18px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
  }

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

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  #site-search {
    display: none;
  }

  main {
    padding: 0 16px 60px;
  }

  #hero {
    border-radius: var(--radius-lg);
    padding: 36px 0 32px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 0 20px;
  }

  main > section:not(#hero):not(#toc) {
    padding: 28px 22px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
  }

  #toc {
    padding: 22px 20px;
  }

  #toc ul {
    gap: 6px;
  }

  #toc a {
    padding: 6px 12px;
    font-size: 0.8rem;
  }

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

  footer {
    padding: 36px 16px 24px;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 46px;
    height: 46px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

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

  .brand-logo {
    width: 34px;
    height: 34px;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 8px 12px;
    font-size: 0.78rem;
  }

  #hero h1 {
    padding: 0 18px;
  }

  .hero-lead {
    padding: 0 18px;
    font-size: 0.9rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 16px;
  }

  .stat-item {
    padding: 14px 8px;
  }

  .stat-number {
    font-size: 1.4rem;
  }

  .stat-label {
    font-size: 0.72rem;
  }

  .banner-prev,
  .banner-next {
    width: 36px;
    height: 36px;
  }

  .banner-slide p {
    padding: 14px 16px;
    font-size: 0.82rem;
  }

  main > section:not(#hero):not(#toc) {
    padding: 22px 16px;
  }

  #cases article,
  #news article,
  #articles article {
    padding: 18px 18px;
  }

  #reviews blockquote {
    padding: 18px 18px 18px 44px;
  }

  #reviews blockquote::before {
    font-size: 2.4rem;
    left: 12px;
  }

  #faq summary {
    padding: 15px 44px 15px 16px;
    font-size: 0.9rem;
  }

  #faq summary::after {
    right: 16px;
  }

  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.88rem;
  }

  #howto ol li {
    padding: 14px 14px 14px 56px;
  }

  #howto ol li::before {
    left: 14px;
    width: 28px;
    height: 28px;
    font-size: 0.82rem;
  }

  #contact address {
    padding: 18px 16px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  #sitemap a,
  #links a {
    padding: 9px 10px;
    font-size: 0.8rem;
  }
}

@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;
  }

  main > section:not(#hero):not(#toc) {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #63b3ed;
    --color-primary-dark: #90cdf4;
    --color-primary-light: #4299e1;
    --color-accent: #f6ad55;
    --color-accent-hover: #ed8936;
    --color-bg: #0d1117;
    --color-bg-alt: #161b22;
    --color-surface: #1c2128;
    --color-surface-glass: rgba(28, 33, 40, 0.78);
    --color-text: #e6edf3;
    --color-text-secondary: #b1bac4;
    --color-text-muted: #8b949e;
    --color-border: #30363d;
    --color-border-glass: rgba(255, 255, 255, 0.08);
    --color-shadow: rgba(0, 0, 0, 0.4);
    --color-shadow-lg: rgba(0, 0, 0, 0.6);
    --gradient-hero: linear-gradient(135deg, #0d1117 0%, #161b22 40%, #1a365d 70%, #2b6cb0 100%);
    --gradient-card: linear-gradient(145deg, rgba(28,33,40,0.95), rgba(22,27,34,0.9));
    --gradient-banner-0: linear-gradient(135deg, #1a365d, #2b6cb0);
    --gradient-banner-1: linear-gradient(135deg, #2b6cb0, #4299e1);
    --gradient-banner-2: linear-gradient(135deg, #0d1117, #2c5282);
  }
}

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

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

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

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

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