:root {
  --bg-primary: #0a0a14;
  --bg-secondary: #12122a;
  --bg-card: rgba(22, 22, 48, 0.72);
  --bg-glass: rgba(20, 20, 45, 0.55);
  --bg-glass-hover: rgba(30, 30, 65, 0.7);
  --text-primary: #f0f0f8;
  --text-secondary: #b0b0cc;
  --text-muted: #7878a0;
  --accent-1: #e94560;
  --accent-2: #533483;
  --accent-3: #0f3460;
  --accent-4: #16213e;
  --accent-glow: rgba(233, 69, 96, 0.35);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(233, 69, 96, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(233, 69, 96, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --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: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 64px;
}

[data-theme="light"] {
  --bg-primary: #f4f4fa;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.78);
  --bg-glass: rgba(255, 255, 255, 0.62);
  --bg-glass-hover: rgba(255, 255, 255, 0.85);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888a8;
  --accent-1: #d63350;
  --accent-2: #6c3fa0;
  --accent-3: #1a4a7a;
  --accent-4: #e8e8f0;
  --accent-glow: rgba(214, 51, 80, 0.2);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(214, 51, 80, 0.35);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 24px rgba(214, 51, 80, 0.15);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg-primary: #f4f4fa;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.78);
    --bg-glass: rgba(255, 255, 255, 0.62);
    --bg-glass-hover: rgba(255, 255, 255, 0.85);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a8;
    --accent-1: #d63350;
    --accent-2: #6c3fa0;
    --accent-3: #1a4a7a;
    --accent-4: #e8e8f0;
    --accent-glow: rgba(214, 51, 80, 0.2);
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(214, 51, 80, 0.35);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 24px rgba(214, 51, 80, 0.15);
  }
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(83, 52, 131, 0.25), transparent),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(233, 69, 96, 0.1), transparent),
    radial-gradient(ellipse 50% 60% at 10% 80%, rgba(15, 52, 96, 0.18), transparent);
  background-attachment: fixed;
  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;
}

[data-theme="light"] body {
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(108, 63, 160, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(214, 51, 80, 0.05), transparent),
    radial-gradient(ellipse 50% 60% at 10% 80%, rgba(26, 74, 122, 0.06), transparent);
}

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

a {
  color: var(--accent-1);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--accent-2);
  opacity: 0.9;
}

ul,
ol {
  list-style: none;
}

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

input {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--accent-1);
  color: #fff;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--accent-2);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-1);
}

header[role="banner"] {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

header[role="banner"]:hover {
  background: var(--bg-glass-hover);
  box-shadow: var(--shadow-sm);
}

header[role="banner"] nav {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

header[role="banner"] nav > a:first-child {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
  white-space: nowrap;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

header[role="banner"] nav > a:first-child:hover {
  transform: scale(1.05);
  opacity: 1;
}

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

header[role="banner"] nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

header[role="banner"] nav ul::-webkit-scrollbar {
  display: none;
}

header[role="banner"] nav ul li a {
  display: block;
  padding: 6px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

header[role="banner"] nav ul li a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  border-radius: 1px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

header[role="banner"] nav ul li a:hover {
  color: var(--text-primary);
  background: rgba(233, 69, 96, 0.08);
  opacity: 1;
}

header[role="banner"] nav ul li a:hover::after {
  width: 60%;
}

header[role="banner"] nav form[role="search"] {
  display: flex;
  align-items: center;
  position: relative;
  flex-shrink: 0;
}

header[role="banner"] nav form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

header[role="banner"] nav form[role="search"] input[type="search"] {
  width: 180px;
  padding: 8px 14px;
  padding-right: 60px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-glass);
  color: var(--text-primary);
  font-size: 0.82rem;
  outline: none;
  transition: width var(--transition-base), border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

header[role="banner"] nav form[role="search"] input[type="search"]::placeholder {
  color: var(--text-muted);
  font-size: 0.78rem;
}

header[role="banner"] nav form[role="search"] input[type="search"]:focus {
  width: 240px;
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-glow);
  background: var(--bg-secondary);
}

header[role="banner"] nav form[role="search"] button[type="submit"] {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  padding: 5px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  border-radius: 999px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

header[role="banner"] nav form[role="search"] button[type="submit"]:hover {
  transform: translateY(-50%) scale(1.05);
  box-shadow: 0 0 16px var(--accent-glow);
  filter: brightness(1.1);
}

header[role="banner"] nav form[role="search"] button[type="submit"]:active {
  transform: translateY(-50%) scale(0.97);
}

#theme-toggle,
#menu-toggle {
  padding: 8px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--text-primary);
  border-color: var(--accent-1);
  background: rgba(233, 69, 96, 0.1);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: translateY(-1px);
}

#theme-toggle:active,
#menu-toggle:active {
  transform: translateY(0) scale(0.97);
}

#menu-toggle {
  display: none;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  padding-top: calc(var(--header-height) + 24px);
}

section {
  margin-bottom: 64px;
  opacity: 0;
  transform: translateY(32px);
  animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

section:nth-child(1) { animation-delay: 0.05s; }
section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.15s; }
section:nth-child(4) { animation-delay: 0.2s; }
section:nth-child(5) { animation-delay: 0.25s; }
section:nth-child(6) { animation-delay: 0.3s; }
section:nth-child(7) { animation-delay: 0.35s; }
section:nth-child(8) { animation-delay: 0.4s; }
section:nth-child(9) { animation-delay: 0.45s; }
section:nth-child(10) { animation-delay: 0.5s; }
section:nth-child(11) { animation-delay: 0.55s; }
section:nth-child(12) { animation-delay: 0.6s; }
section:nth-child(13) { animation-delay: 0.65s; }
section:nth-child(14) { animation-delay: 0.7s; }
section:nth-child(15) { animation-delay: 0.75s; }
section:nth-child(16) { animation-delay: 0.8s; }
section:nth-child(17) { animation-delay: 0.85s; }
section:nth-child(18) { animation-delay: 0.9s; }
section:nth-child(19) { animation-delay: 0.95s; }
section:nth-child(20) { animation-delay: 1s; }

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

@supports (animation-timeline: view()) {
  section {
    animation: fadeInUp linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 40%;
  }
}

section h2 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
  position: relative;
  padding-bottom: 14px;
  color: var(--text-primary);
}

section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2), var(--accent-3));
  border-radius: 2px;
  transition: width var(--transition-slow);
}

section:hover h2::after {
  width: 100px;
}

section h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

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

section ul {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

section ul li {
  position: relative;
  padding-left: 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

section ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  box-shadow: 0 0 6px var(--accent-glow);
}

#hero {
  text-align: center;
  padding: 48px 32px 56px;
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.12), rgba(83, 52, 131, 0.18), rgba(15, 52, 96, 0.14));
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(233, 69, 96, 0.15), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(83, 52, 131, 0.15), transparent 50%);
  pointer-events: none;
}

#hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.25;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-1) 60%, var(--accent-2) 90%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 8s ease infinite;
  position: relative;
}

#hero > p {
  max-width: 720px;
  margin: 0 auto 32px;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
  position: relative;
}

#hero figure {
  margin: 0;
  position: relative;
}

#hero figure svg {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(83, 52, 131, 0.2);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

#hero figure svg:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg), 0 0 80px rgba(233, 69, 96, 0.25);
}

#hero figcaption {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

#brand,
#products,
#solutions,
#cases,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal,
#author-info,
#team,
#qualifications {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

#brand:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#links:hover,
#legal:hover,
#author-info:hover,
#team:hover,
#qualifications:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow), var(--shadow-md);
  transform: translateY(-2px);
}

#products ul {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

#products ul li {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px 14px 40px;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#products ul li::before {
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
}

#products ul li:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

#cases blockquote {
  position: relative;
  margin: 16px 0;
  padding: 20px 24px 20px 52px;
  background: var(--bg-glass);
  border-left: 4px solid var(--accent-1);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

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

#cases blockquote:hover {
  background: var(--bg-glass-hover);
  border-left-color: var(--accent-2);
  transform: translateX(4px);
}

#cases blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

#articles {
  display: grid;
  gap: 16px;
}

#articles > h2 {
  grid-column: 1 / -1;
}

#articles article {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: background var(--transition-base), border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2), var(--accent-3));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

#articles article:hover::before {
  transform: scaleX(1);
}

#articles article:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

#articles article h3 {
  margin-top: 0;
  font-size: 1.1rem;
  margin-bottom: 8px;
  transition: color var(--transition-fast);
}

#articles article:hover h3 {
  color: var(--accent-1);
}

#articles article > p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

#articles article > p:nth-of-type(2) {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-1);
  padding: 4px 0;
  position: relative;
  transition: color var(--transition-fast), gap var(--transition-fast);
}

#articles article a::after {
  content: "\2192";
  font-size: 0.9rem;
  transition: transform var(--transition-fast);
}

#articles article a:hover {
  color: var(--accent-2);
  gap: 8px;
  opacity: 1;
}

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

#faq {
  display: grid;
  gap: 12px;
}

#faq > h2 {
  margin-bottom: 16px;
}

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

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

#faq details[open] {
  background: var(--bg-glass-hover);
  border-color: var(--accent-1);
  box-shadow: var(--shadow-glow);
}

#faq details summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
}

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

#faq details summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: transform var(--transition-base), background var(--transition-base);
}

#faq details[open] summary::before {
  content: "\2212";
  transform: rotate(180deg);
  background: linear-gradient(135deg, var(--accent-2), var(--accent-3));
}

#faq details summary:hover {
  background: rgba(233, 69, 96, 0.06);
}

#faq details p {
  padding: 0 20px 18px 52px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-secondary);
  animation: faqSlide 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

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

#howto ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 14px 18px 14px 56px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.7;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 0 12px var(--accent-glow);
}

#howto ol li:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
}

#howto ul {
  margin-bottom: 20px;
}

#howto ul li {
  font-size: 0.9rem;
}

#contact ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

#contact ul li {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

#contact ul li:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

#sitemap ul li,
#links ul li {
  padding-left: 0;
}

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

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 12px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  background: var(--bg-glass-hover);
  border-color: var(--accent-1);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm), var(--shadow-glow);
  opacity: 1;
}

#legal h2 {
  font-size: 1.3rem;
  margin-top: 28px;
}

#legal h2:first-child {
  margin-top: 0;
}

#legal p {
  font-size: 0.88rem;
  line-height: 1.85;
}

#author-info p,
#team p,
#qualifications p {
  font-size: 0.9rem;
}

#author-info p:first-of-type {
  font-weight: 600;
  color: var(--text-primary);
}

footer[role="contentinfo"] {
  max-width: var(--max-width);
  margin: 48px auto 0;
  padding: 36px 32px;
  background: var(--bg-glass);
  border-top: 1px solid var(--border-color);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  text-align: center;
}

footer[role="contentinfo"] p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  line-height: 1.7;
}

footer[role="contentinfo"] p:last-child {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

footer[role="contentinfo"] a {
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

footer[role="contentinfo"] a:hover {
  color: var(--accent-1);
  opacity: 1;
}

#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md), 0 0 20px var(--accent-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: var(--shadow-lg), 0 0 32px var(--accent-glow);
}

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

@media (max-width: 1024px) {
  header[role="banner"] nav ul li a {
    padding: 6px 8px;
    font-size: 0.82rem;
  }

  header[role="banner"] nav form[role="search"] input[type="search"] {
    width: 140px;
  }

  header[role="banner"] nav form[role="search"] input[type="search"]:focus {
    width: 180px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  header[role="banner"] nav {
    padding: 0 16px;
    gap: 10px;
  }

  header[role="banner"] nav > a:first-child {
    font-size: 1.15rem;
  }

  header[role="banner"] nav ul {
    display: none;
    position: fixed;
    top: var(--header-height);
    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(--border-color);
    flex-direction: column;
    padding: 12px 16px;
    gap: 4px;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  }

  header[role="banner"] nav ul.menu-open {
    display: flex;
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  header[role="banner"] nav ul li a {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

  header[role="banner"] nav form[role="search"] {
    display: none;
  }

  #menu-toggle {
    display: block;
    margin-left: auto;
  }

  #theme-toggle {
    padding: 6px 10px;
    font-size: 0.72rem;
  }

  main {
    padding: 0 16px;
    padding-top: calc(var(--header-height) + 16px);
  }

  section {
    margin-bottom: 40px;
  }

  section h2 {
    font-size: 1.4rem;
    margin-bottom: 20px;
  }

  section h3 {
    font-size: 1.05rem;
    margin-top: 22px;
  }

  section p {
    font-size: 0.9rem;
  }

  #hero {
    padding: 32px 20px 40px;
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    font-size: clamp(1.3rem, 5vw, 1.8rem);
  }

  #hero > p {
    font-size: 0.9rem;
  }

  #brand,
  #products,
  #solutions,
  #cases,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #legal,
  #author-info,
  #team,
  #qualifications {
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

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

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

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

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

  #faq details p {
    padding: 0 16px 16px 48px;
    font-size: 0.85rem;
  }

  #howto ol li {
    padding: 12px 14px 12px 50px;
    font-size: 0.88rem;
  }

  #howto ol li::before {
    left: 14px;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
  }

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

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

  footer[role="contentinfo"] {
    padding: 28px 18px;
    margin-top: 32px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 0.62rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  header[role="banner"] nav > a:first-child {
    font-size: 1rem;
  }

  #theme-toggle {
    padding: 5px 8px;
    font-size: 0.68rem;
  }

  #menu-toggle {
    padding: 5px 10px;
    font-size: 0.72rem;
  }

  #hero {
    padding: 24px 16px 32px;
  }

  #hero h1 {
    font-size: 1.25rem;
  }

  section h2 {
    font-size: 1.25rem;
  }

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

  #articles article {
    padding: 18px 16px;
  }

  #articles article h3 {
    font-size: 1rem;
  }
}

@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;
  }
}

@media print {
  header[role="banner"],
  #back-to-top,
  #theme-toggle,
  #menu-toggle {
    display: none;
  }

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

  section {
    opacity: 1;
    transform: none;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}