:root {
  --primary: #6C4CF1;
  --primary-light: #8B6FF5;
  --primary-dark: #4A2FD4;
  --primary-soft: #F3F0FF;
  --primary-soft-2: #EFEAFF;
  --accent: #FF6B9D;
  --accent-2: #00D4AA;
  --gradient-hero: linear-gradient(135deg, #6C4CF1 0%, #9B6FF5 45%, #FF6B9D 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(243,240,255,0.7));
  --gradient-btn: linear-gradient(135deg, #6C4CF1, #8B6FF5);
  --bg: #FAFAFF;
  --bg-alt: #F3F0FF;
  --bg-card: #FFFFFF;
  --bg-header: rgba(255,255,255,0.82);
  --bg-glass: rgba(255,255,255,0.6);
  --text: #1A1630;
  --text-secondary: #4A4460;
  --text-muted: #7A7490;
  --border: #E4DEFF;
  --border-soft: rgba(108,76,241,0.12);
  --shadow-sm: 0 2px 8px rgba(108,76,241,0.08);
  --shadow-md: 0 8px 24px rgba(108,76,241,0.12);
  --shadow-lg: 0 16px 48px rgba(108,76,241,0.16);
  --shadow-glow: 0 0 32px rgba(108,76,241,0.25);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

html.dark {
  --primary: #8B6FF5;
  --primary-light: #A78BFA;
  --primary-dark: #6C4CF1;
  --primary-soft: #1E1A33;
  --primary-soft-2: #252040;
  --gradient-hero: linear-gradient(135deg, #2A1F5E 0%, #4A2FD4 45%, #8B3A6B 100%);
  --gradient-card: linear-gradient(145deg, rgba(37,32,64,0.9), rgba(30,26,51,0.7));
  --bg: #0F0D1A;
  --bg-alt: #16132B;
  --bg-card: #1E1A33;
  --bg-header: rgba(15,13,26,0.85);
  --bg-glass: rgba(30,26,51,0.6);
  --text: #F0EEFF;
  --text-secondary: #C4BEE0;
  --text-muted: #8A84A8;
  --border: #2E2850;
  --border-soft: rgba(139,111,245,0.18);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 32px rgba(139,111,245,0.35);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

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

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(108,76,241,0.08) 0%, transparent 50%),
    radial-gradient(circle at 85% 60%, rgba(255,107,157,0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(0,212,170,0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

html.dark body::before {
  background:
    radial-gradient(circle at 15% 20%, rgba(139,111,245,0.12) 0%, transparent 50%),
    radial-gradient(circle at 85% 60%, rgba(255,107,157,0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(0,212,170,0.06) 0%, transparent 50%);
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

ul,
ol {
  padding-left: 1.25em;
}

li {
  margin-bottom: 0.35em;
}

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

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1.25rem;
  position: relative;
  padding-bottom: 0.75rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-btn);
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  margin: 1.5rem 0 0.75rem;
  color: var(--text);
}

h4 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--primary);
}

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

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

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  font-style: italic;
  color: var(--text);
  margin-bottom: 0.5rem;
}

blockquote footer {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: normal;
}

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

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

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.5rem 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-soft);
}

.top-bar p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-bar nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.top-bar nav a {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--transition);
}

.top-bar nav a:hover {
  color: var(--primary);
}

#theme-toggle {
  padding: 0.3rem 0.85rem;
  font-size: 0.8rem;
  font-family: inherit;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

#theme-toggle:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

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

.main-header > a:first-child {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.main-header > a:first-child:hover {
  transform: scale(1.03);
}

.main-header > a:first-child svg {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.main-header > a:first-child:hover svg {
  box-shadow: var(--shadow-glow);
  transform: rotate(-4deg) scale(1.05);
}

.main-header form[role="search"] {
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 480px;
  margin-left: auto;
  position: relative;
}

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

.main-header form[role="search"] input[type="search"] {
  width: 100%;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill) 0 0 var(--radius-pill);
  transition: all var(--transition);
  outline: none;
}

.main-header form[role="search"] input[type="search"]::placeholder {
  color: var(--text-muted);
}

.main-header form[role="search"] input[type="search"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--border-soft), var(--shadow-sm);
  background: var(--bg-card);
}

.main-header form[role="search"] button[type="submit"] {
  padding: 0.65rem 1.5rem;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-btn);
  border: none;
  border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.main-header form[role="search"] button[type="submit"]:hover {
  filter: brightness(1.1);
  box-shadow: var(--shadow-glow);
}

#menu-toggle {
  display: none;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

#menu-toggle:hover {
  background: var(--primary);
  color: #fff;
}

#primary-nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  border-top: 1px solid var(--border-soft);
}

#primary-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

#primary-nav li {
  margin: 0;
}

#primary-nav a {
  display: block;
  padding: 0.6rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: all var(--transition);
}

#primary-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  background: var(--gradient-btn);
  border-radius: var(--radius-pill);
  transform: translateX(-50%);
  transition: width var(--transition);
}

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

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

main {
  position: relative;
  z-index: 1;
}

main > section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
}

#hero {
  padding-top: 3rem;
  padding-bottom: 3rem;
  position: relative;
}

#hero::before {
  content: "";
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  width: 120%;
  max-width: 1400px;
  height: 500px;
  background: var(--gradient-hero);
  opacity: 0.06;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: -1;
}

#hero h1 {
  margin-bottom: 1.25rem;
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}

#hero > p {
  font-size: 1.05rem;
  max-width: 800px;
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.1s both;
}

#hero figure {
  margin: 2.5rem 0 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s both;
}

#hero figure:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

#hero figure svg {
  width: 100%;
  display: block;
}

#hero figcaption {
  padding: 1rem 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--bg-alt);
  border-top: 1px solid var(--border-soft);
}

#brand,
#products,
#solutions,
#scenarios,
#cases,
#articles,
#news,
#faq,
#howto,
#contact,
#sitemap,
#legal {
  position: relative;
}

#brand h3,
#products h3,
#solutions h3,
#scenarios h3,
#cases h3,
#news h3,
#howto h3,
#contact h3,
#legal h3 {
  padding-left: 1rem;
  position: relative;
}

#brand h3::before,
#products h3::before,
#solutions h3::before,
#scenarios h3::before,
#cases h3::before,
#news h3::before,
#howto h3::before,
#contact h3::before,
#legal h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.25em;
  bottom: 0.25em;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-btn);
}

#products h4 {
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  margin-top: 1.5rem;
  transition: all var(--transition);
}

#products h4:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

#products h4 + p {
  padding: 0 1.25rem;
}

article {
  background: var(--gradient-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-btn);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

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

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

article h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

article > p:first-of-type {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

article > p:first-of-type::before {
  content: "📅";
  font-size: 0.8rem;
}

article a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--primary);
  padding: 0.4rem 1rem;
  background: var(--primary-soft);
  border-radius: var(--radius-pill);
  transition: all var(--transition);
}

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

article a:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

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

#cases blockquote {
  position: relative;
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  top: -0.5rem;
  left: 1rem;
  font-size: 3rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.2;
  font-family: Georgia, serif;
}

#faq details {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

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

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

#faq summary {
  padding: 1.1rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: background var(--transition), color var(--transition);
  position: relative;
}

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

#faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 50%;
  transition: all var(--transition);
}

#faq details[open] summary {
  color: var(--primary);
  background: var(--primary-soft);
}

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

#faq details p {
  padding: 0 1.5rem 1.25rem;
  margin: 0;
  animation: fadeInUp 0.3s ease both;
}

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

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

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-btn);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

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

#contact p {
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--border-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#contact p:last-child {
  border-bottom: none;
}

#sitemap ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}

#sitemap li {
  margin: 0;
}

#sitemap a {
  display: block;
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

#sitemap a:hover {
  color: #fff;
  background: var(--gradient-btn);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#sitemap h3 {
  margin-top: 2rem;
}

#sitemap h3 + ul {
  grid-template-columns: 1fr;
}

footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border-soft);
  padding: 2.5rem 1.5rem;
  text-align: center;
  position: relative;
  z-index: 1;
}

footer > p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
}

footer nav a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 2px;
}

footer nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-btn);
  border-radius: var(--radius-pill);
  transition: width var(--transition);
}

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

footer nav a:hover::after {
  width: 100%;
}

#back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 999;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-btn);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: all var(--transition);
  text-indent: -9999px;
  overflow: hidden;
}

#back-to-top::before {
  content: "↑";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  text-indent: 0;
}

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

#back-to-top:hover {
  filter: brightness(1.1);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px) scale(1.05);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 var(--border-soft); }
  50% { box-shadow: 0 0 0 8px transparent; }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  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; }

@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 (max-width: 1024px) {
  :root {
    --max-width: 100%;
  }

  main > section {
    padding: 2.75rem 1.25rem;
  }
}

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

  body {
    font-size: 15px;
  }

  .top-bar {
    padding: 0.4rem 1rem;
    font-size: 0.78rem;
  }

  .top-bar p {
    font-size: 0.78rem;
  }

  .top-bar nav {
    gap: 0.6rem;
  }

  .top-bar nav a {
    font-size: 0.78rem;
  }

  #theme-toggle {
    padding: 0.25rem 0.6rem;
    font-size: 0.72rem;
  }

  .main-header {
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
  }

  .main-header > a:first-child {
    font-size: 1.05rem;
  }

  .main-header > a:first-child svg {
    width: 36px;
    height: 36px;
  }

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

  .main-header form[role="search"] {
    order: 3;
    flex-basis: 100%;
    max-width: 100%;
    margin-left: 0;
  }

  #primary-nav {
    max-height: 0;
    overflow: hidden;
    padding: 0 1rem;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  }

  #primary-nav.open {
    max-height: 600px;
    padding: 0.5rem 1rem 1rem;
  }

  #primary-nav ul {
    flex-direction: column;
    gap: 0.15rem;
  }

  #primary-nav a {
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
  }

  main > section {
    padding: 2.25rem 1rem;
  }

  #hero {
    padding-top: 1.75rem;
  }

  #hero > p {
    font-size: 0.95rem;
  }

  #hero figure {
    margin-top: 1.75rem;
    border-radius: var(--radius-lg);
  }

  #hero figcaption {
    padding: 0.75rem 1rem;
    font-size: 0.82rem;
  }

  article {
    padding: 1.25rem;
    border-radius: var(--radius-md);
  }

  article h3 {
    font-size: 1.05rem;
  }

  #faq summary {
    padding: 0.9rem 1.1rem;
    font-size: 0.92rem;
  }

  #faq details p {
    padding: 0 1.1rem 1rem;
    font-size: 0.9rem;
  }

  #howto ol li {
    padding: 0.85rem 0.85rem 0.85rem 3rem;
    font-size: 0.9rem;
  }

  #howto ol li::before {
    left: 0.75rem;
    width: 28px;
    height: 28px;
    font-size: 0.78rem;
  }

  #sitemap ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.4rem;
  }

  #sitemap a {
    padding: 0.5rem 0.75rem;
    font-size: 0.82rem;
  }

  footer {
    padding: 2rem 1rem;
  }

  footer nav {
    gap: 0.4rem 1rem;
  }

  footer nav a {
    font-size: 0.82rem;
  }

  #back-to-top {
    right: 1rem;
    bottom: 1rem;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .top-bar p {
    display: none;
  }

  .top-bar {
    justify-content: flex-end;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.05rem;
  }

  blockquote {
    padding: 1rem 1.1rem;
  }

  .main-header form[role="search"] button[type="submit"] {
    padding: 0.65rem 1rem;
    font-size: 0.82rem;
  }

  .main-header form[role="search"] input[type="search"] {
    padding: 0.6rem 1rem;
    font-size: 0.82rem;
  }
}

@media print {
  header#site-header,
  #back-to-top,
  footer nav {
    display: none;
  }

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

  main > section {
    padding: 1rem 0;
    page-break-inside: avoid;
  }

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