:root {
  --primary: #1a56db;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --primary-lighter: #60a5fa;
  --primary-lightest: #dbeafe;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --gradient-start: #1a56db;
  --gradient-mid: #3b82f6;
  --gradient-end: #7c3aed;
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.45);
  --bg-header: rgba(255, 255, 255, 0.82);
  --bg-footer: #0f172a;
  --bg-section-alt: #f1f5f9;
  --bg-input: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --shadow-xl: 0 20px 60px rgba(26, 86, 219, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 72px;
  --max-width: 1200px;
  --glass-blur: 16px;
}

[data-theme="dark"] {
  --bg-body: #0b1120;
  --bg-card: #1e293b;
  --bg-card-glass: rgba(30, 41, 59, 0.75);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --bg-header: rgba(15, 23, 42, 0.85);
  --bg-footer: #060a14;
  --bg-section-alt: #0f172a;
  --bg-input: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-inverse: #0f172a;
  --border-color: #334155;
  --border-light: #1e293b;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 60px rgba(26, 86, 219, 0.25);
  --primary-lightest: #1e3a5f;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

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

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

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

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

[data-theme="dark"] a:hover {
  color: var(--primary-lighter);
}

ul,
ol {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--text-tertiary);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-section-alt);
}

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

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

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

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.125rem;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--text-primary);
}

.logo svg {
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 8px rgba(26, 86, 219, 0.3);
}

.logo-text {
  white-space: nowrap;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

#main-nav ul {
  display: flex;
  align-items: center;
  gap: 2px;
}

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

#main-nav a:hover {
  color: var(--primary);
  background: var(--primary-lightest);
  transform: translateY(-1px);
}

[data-theme="dark"] #main-nav a:hover {
  background: rgba(59, 130, 246, 0.15);
}

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

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

#site-search input {
  width: 160px;
  padding: 8px 16px;
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.8125rem;
  color: var(--text-primary);
}

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

#site-search button {
  padding: 8px 16px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  transition: opacity var(--transition-fast);
}

#site-search button:hover {
  opacity: 0.88;
}

#mobile-menu-btn,
#dark-mode-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

#mobile-menu-btn:hover,
#dark-mode-toggle:hover {
  background: var(--primary-lightest);
  color: var(--primary);
}

[data-theme="dark"] #mobile-menu-btn:hover,
[data-theme="dark"] #dark-mode-toggle:hover {
  background: rgba(59, 130, 246, 0.15);
}

#dark-mode-toggle {
  display: flex;
}

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

section {
  padding: 64px 0;
}

section h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  position: relative;
  display: inline-block;
  background: linear-gradient(135deg, var(--text-primary), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

section h2::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

section h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 32px 0 12px;
  letter-spacing: -0.01em;
}

section h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 8px;
}

section p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  max-width: 72ch;
}

section ul,
section ol {
  color: var(--text-secondary);
  margin-bottom: 16px;
  padding-left: 0;
}

section ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
}

section ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  flex-shrink: 0;
}

section ol {
  counter-reset: item;
}

section ol li {
  position: relative;
  padding-left: 32px;
  margin-bottom: 12px;
  counter-increment: item;
}

section ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

#hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 80px 0 64px;
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26, 86, 219, 0.12), transparent 70%);
  pointer-events: none;
  animation: heroGlow 8s ease-in-out infinite alternate;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -150px;
  left: -150px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.1), transparent 70%);
  pointer-events: none;
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes heroGlow {
  from {
    transform: scale(1) translate(0, 0);
    opacity: 0.6;
  }
  to {
    transform: scale(1.2) translate(30px, -20px);
    opacity: 1;
  }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 56ch;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  box-shadow: 0 4px 20px rgba(26, 86, 219, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(26, 86, 219, 0.45);
  color: #fff;
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.25) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn-primary:hover::after {
  transform: translateX(100%);
}

.btn-secondary {
  background: var(--bg-card-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--text-primary);
  border: 1px solid var(--bg-glass-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: var(--primary);
  border-color: var(--primary);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 16px;
  background: var(--bg-card-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hero-stats li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hero-stats li::before {
  display: none;
}

.hero-stats strong {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.hero-stats span {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 4px;
  white-space: nowrap;
}

.hero-banner {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: var(--bg-card);
  aspect-ratio: 600 / 320;
}

.banner-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.7s ease, transform 0.7s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-slide.active {
  opacity: 1;
  transform: scale(1);
  position: relative;
}

.banner-slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}

.banner-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  border: 2px solid rgba(255, 255, 255, 0.8);
  transition: all var(--transition-fast);
  padding: 0;
}

.banner-dots .dot.active {
  width: 28px;
  border-radius: var(--radius-full);
  background: #fff;
  border-color: #fff;
}

.banner-dots .dot:hover {
  background: rgba(255, 255, 255, 0.85);
}

#breadcrumb {
  padding: 16px 0;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

#breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

#breadcrumb li + li::before {
  content: "/";
  color: var(--text-tertiary);
  opacity: 0.5;
}

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

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

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

#about,
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal {
  scroll-margin-top: calc(var(--header-height) + 16px);
}

#about,
#solutions,
#news,
#faq,
#contact,
#legal {
  background: var(--bg-section-alt);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  margin: 32px 0;
}

#products,
#cases,
#articles,
#howto,
#sitemap,
#links {
  padding: 48px 0;
}

#products h3,
#solutions h3,
#cases h3,
#news h3,
#articles h3,
#faq h3,
#howto h3,
#contact h3,
#legal h3 {
  padding-left: 16px;
  border-left: 4px solid var(--primary);
  border-radius: 2px;
}

#products h4 {
  color: var(--primary);
}

blockquote {
  position: relative;
  margin: 20px 0;
  padding: 24px 28px 24px 56px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 8px;
  font-size: 3rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.25;
  font-family: Georgia, serif;
}

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

#articles article {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-lighter);
}

#articles article h3 {
  margin-top: 0;
  border-left: none;
  padding-left: 0;
  font-size: 1.1875rem;
}

#articles article h3 a {
  color: inherit;
}

#articles article p:first-of-type {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

#articles article a {
  font-weight: 600;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast);
}

#articles article a:hover {
  gap: 10px;
}

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

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

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

#faq summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background var(--transition-fast), color var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--primary);
  flex-shrink: 0;
  transition: transform var(--transition-base);
  line-height: 1;
}

#faq details[open] summary::after {
  transform: rotate(45deg);
}

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

[data-theme="dark"] #faq summary:hover {
  background: rgba(59, 130, 246, 0.12);
}

#faq details p {
  padding: 0 24px 20px;
  margin-bottom: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  animation: fadeSlideIn 0.35s ease;
}

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

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

#howto ol > li {
  counter-increment: howto-step;
  position: relative;
  padding: 24px 28px 24px 72px;
  margin-bottom: 16px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#howto ol > li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-lighter);
}

#howto ol > li::before {
  content: counter(howto-step);
  position: absolute;
  left: 20px;
  top: 24px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(26, 86, 219, 0.3);
}

#howto ol > li h4 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.0625rem;
}

#howto ol > li p {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

#contact p {
  font-size: 0.9375rem;
  margin-bottom: 8px;
}

#contact ul li {
  font-size: 0.9375rem;
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}

#sitemap ul li {
  padding-left: 0;
  margin-bottom: 0;
}

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

#sitemap ul li a {
  display: block;
  padding: 10px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

[data-theme="dark"] #sitemap ul li a:hover {
  background: rgba(59, 130, 246, 0.12);
}

#links ul {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

#links ul li {
  padding-left: 0;
  margin-bottom: 0;
}

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

#links ul li a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--bg-card-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

#links ul li a:hover {
  color: var(--primary);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

#site-footer {
  background: var(--bg-footer);
  color: #cbd5e1;
  margin-top: 64px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr 1fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand svg {
  border-radius: var(--radius-sm);
}

.footer-brand p {
  font-size: 0.875rem;
  color: #94a3b8;
  line-height: 1.7;
  max-width: 32ch;
}

.footer-links h4,
.footer-contact h4,
.footer-legal h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.footer-links ul,
.footer-legal ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a,
.footer-legal a {
  font-size: 0.875rem;
  color: #94a3b8;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a:hover,
.footer-legal a:hover {
  color: #fff;
  padding-left: 6px;
}

.footer-contact p {
  font-size: 0.875rem;
  color: #94a3b8;
  margin-bottom: 10px;
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 24px;
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: #64748b;
  margin-bottom: 4px;
}

.footer-bottom p:last-child {
  margin-bottom: 0;
}

#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(26, 86, 219, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  z-index: 999;
}

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

#back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(26, 86, 219, 0.55);
}

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

@media (max-width: 1024px) {
  #hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 56px 0 48px;
  }

  .hero-content h1 {
    font-size: 2.25rem;
  }

  .hero-banner {
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
  }

  .hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  #main-nav a {
    padding: 8px 10px;
    font-size: 0.8125rem;
  }

  #site-search input {
    width: 120px;
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

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

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-header);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-bottom: 1px solid var(--bg-glass-border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease;
    z-index: 998;
    justify-content: flex-start;
  }

  #main-nav.open {
    max-height: 80vh;
    overflow-y: auto;
    padding: 12px 0;
    box-shadow: var(--shadow-lg);
  }

  #main-nav ul {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  #main-nav a {
    padding: 14px 24px;
    border-radius: 0;
    font-size: 0.9375rem;
    width: 100%;
  }

  #main-nav a:hover {
    transform: none;
  }

  #mobile-menu-btn {
    display: flex;
    order: -1;
  }

  #site-search {
    display: none;
  }

  #dark-mode-toggle {
    margin-left: auto;
  }

  main {
    padding: 0 16px;
  }

  section {
    padding: 40px 0;
  }

  section h2 {
    font-size: 1.5rem;
  }

  section h3 {
    font-size: 1.125rem;
  }

  #hero {
    padding: 40px 0 32px;
  }

  .hero-content h1 {
    font-size: 1.75rem;
  }

  .hero-lead {
    font-size: 0.9375rem;
  }

  .hero-actions {
    gap: 12px;
  }

  .btn-primary,
  .btn-secondary {
    padding: 12px 24px;
    font-size: 0.875rem;
    flex: 1;
    min-width: 140px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .hero-stats li {
    padding: 12px;
  }

  .hero-stats strong {
    font-size: 1.25rem;
  }

  #about,
  #solutions,
  #news,
  #faq,
  #contact,
  #legal {
    padding: 32px 20px;
    margin: 20px 0;
    border-radius: var(--radius-lg);
  }

  #articles article {
    padding: 20px;
    border-radius: var(--radius-md);
  }

  #howto ol > li {
    padding: 20px 20px 20px 60px;
  }

  #howto ol > li::before {
    left: 14px;
    top: 20px;
    width: 32px;
    height: 32px;
    font-size: 0.8125rem;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 16px 32px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.125rem;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 1.5rem;
  }

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

  .hero-stats strong {
    font-size: 1.125rem;
  }

  .hero-stats span {
    font-size: 0.6875rem;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    flex: none;
  }

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

  #links ul {
    flex-direction: column;
  }

  #links ul li a {
    width: 100%;
    justify-content: center;
  }
}

@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  #site-header,
  #back-to-top,
  #mobile-menu-btn,
  #dark-mode-toggle,
  #site-search,
  .hero-banner,
  .banner-dots {
    display: none !important;
  }

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

  main {
    max-width: 100%;
    padding: 0;
  }

  section {
    padding: 20px 0;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  #site-footer {
    background: #fff;
    color: #000;
    border-top: 1px solid #ccc;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}