:root {
  --brand: #ff6b35;
  --brand-dark: #e8551f;
  --brand-light: #ff8f66;
  --accent: #2e8b57;
  --accent-2: #4b3f72;
  --bg: #f7f8fc;
  --bg-alt: #ffffff;
  --bg-elevated: #ffffff;
  --text: #1a1d2b;
  --text-secondary: #4a5068;
  --text-muted: #7b8199;
  --border: #e4e7f0;
  --border-strong: #d0d5e3;
  --shadow-sm: 0 2px 8px rgba(26, 29, 43, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 29, 43, 0.08);
  --shadow-lg: 0 16px 48px rgba(26, 29, 43, 0.12);
  --shadow-brand: 0 8px 28px rgba(255, 107, 53, 0.28);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.55);
  --glass-blur: 18px;
  --header-h: 68px;
  --transition: 0.28s cubic-bezier(0.22, 1, 0.36, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="dark"] {
  --bg: #0e1018;
  --bg-alt: #161a26;
  --bg-elevated: #1c2130;
  --text: #eef1f8;
  --text-secondary: #b6bccd;
  --text-muted: #828a9e;
  --border: #262c3d;
  --border-strong: #333a4e;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --glass-bg: rgba(28, 33, 48, 0.72);
  --glass-border: rgba(255, 255, 255, 0.08);
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 12% -8%, rgba(255, 107, 53, 0.10), transparent 60%),
    radial-gradient(900px 520px at 92% 4%, rgba(46, 139, 87, 0.10), transparent 55%),
    radial-gradient(760px 480px at 50% 110%, rgba(75, 63, 114, 0.10), transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

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

a:hover,
a:focus-visible {
  color: var(--brand);
}

html[data-theme="dark"] a {
  color: var(--brand-light);
}

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

h1 {
  font-size: clamp(1.75rem, 4.2vw, 2.75rem);
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin: 0 0 1.25rem;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--brand), var(--brand-light));
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  margin: 1.75rem 0 0.75rem;
}

p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

ul, ol {
  color: var(--text-secondary);
}

blockquote {
  margin: 0;
}

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

address {
  font-style: normal;
}

.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;
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
}

.brand svg {
  border-radius: 12px;
  box-shadow: var(--shadow-brand);
  transition: transform var(--transition);
}

.brand:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, var(--brand), var(--brand-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}

#main-nav {
  flex: 1 1 auto;
  min-width: 0;
}

#main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

#main-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition), background-color var(--transition), transform var(--transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--brand-dark);
  background: rgba(255, 107, 53, 0.08);
  transform: translateY(-1px);
}

#main-nav a:hover::after,
#main-nav a:focus-visible::after {
  transform: scaleX(1);
}

html[data-theme="dark"] #main-nav a:hover,
html[data-theme="dark"] #main-nav a:focus-visible {
  color: var(--brand-light);
  background: rgba(255, 107, 53, 0.14);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#site-search {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 4px 4px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.18);
}

#site-search input {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  width: 150px;
  padding: 6px 0;
}

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

#site-search button {
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(120deg, var(--brand), var(--brand-dark));
  padding: 7px 16px;
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#site-search button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-brand);
  filter: brightness(1.05);
}

#theme-toggle,
#menu-toggle {
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition), transform var(--transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--brand-dark);
  border-color: var(--brand);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
}

/* ============ Main layout ============ */
main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

main > section {
  margin-bottom: 56px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  padding: 10px 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--border-strong);
}

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

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

/* ============ Hero ============ */
#hero {
  position: relative;
  padding: 32px clamp(18px, 3vw, 40px) 40px;
  border-radius: var(--radius-xl);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 0% 0%, rgba(255, 107, 53, 0.16), transparent 65%),
    radial-gradient(520px 280px at 100% 100%, rgba(75, 63, 114, 0.14), transparent 65%);
  pointer-events: none;
}

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

.banner-carousel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-bottom: 32px;
}

.banner-slide {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
  will-change: transform;
}

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

.banner-slide:hover {
  transform: translateY(-6px) scale(1.015);
  box-shadow: var(--shadow-lg);
}

#hero-title {
  margin-bottom: 1rem;
  background: linear-gradient(120deg, var(--text) 30%, var(--brand) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

html[data-theme="dark"] #hero-title {
  background: linear-gradient(120deg, #fff 20%, var(--brand-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 1.05rem;
  max-width: 78ch;
}

.hero-answer {
  max-width: 78ch;
  padding: 16px 20px;
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(255, 107, 53, 0.08);
  color: var(--text-secondary);
}

html[data-theme="dark"] .hero-answer {
  background: rgba(255, 107, 53, 0.14);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 20px 12px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stat:hover {
  transform: translateY(-4px);
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}

.stat-num {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--brand), var(--brand-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============ Anchor nav ============ */
#anchor-nav {
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

#anchor-nav h2 {
  font-size: 1rem;
  margin-bottom: 12px;
  padding-left: 14px;
}

#anchor-nav h2::before {
  width: 4px;
}

#anchor-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#anchor-nav a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 999px;
  color: var(--text-secondary);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition);
}

#anchor-nav a:hover {
  color: #fff;
  background: linear-gradient(120deg, var(--brand), var(--brand-dark));
  border-color: transparent;
  transform: translateY(-2px);
}

/* ============ Content sections ============ */
main > section:not(#hero):not(#anchor-nav) {
  padding: clamp(22px, 3vw, 36px);
  border-radius: var(--radius-lg);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), background-color var(--transition);
}

main > section:not(#hero):not(#anchor-nav):hover {
  box-shadow: var(--shadow-md);
}

/* ============ News / Articles ============ */
#news article,
#articles article {
  padding: 20px 22px;
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--brand), var(--brand-light));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateX(6px);
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}

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

#news article h3,
#articles article h3 {
  margin: 0 0 6px;
  font-size: 1.08rem;
}

#news article h3 a,
#articles article h3 a {
  color: var(--text);
}

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

#news article p,
#articles article p {
  margin-bottom: 6px;
  font-size: 0.95rem;
}

#news article p:last-child a,
#articles article p:last-child a {
  font-weight: 600;
  font-size: 0.88rem;
}

/* ============ Reviews ============ */
#reviews blockquote {
  position: relative;
  padding: 20px 24px 20px 56px;
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#reviews blockquote::before {
  content: "\201C";
  position: absolute;
  left: 18px;
  top: 6px;
  font-size: 3rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--brand);
  opacity: 0.65;
}

#reviews blockquote:hover {
  transform: translateY(-4px);
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}

#reviews blockquote p {
  margin: 0;
  font-size: 0.98rem;
  color: var(--text-secondary);
}

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

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

#faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 48px 16px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  transition: color var(--transition), background-color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--brand);
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  content: "\2212";
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  color: var(--brand-dark);
  background: rgba(255, 107, 53, 0.06);
}

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.94rem;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

/* ============ HowTo ============ */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: grid;
  gap: 12px;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 14px 18px 14px 60px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 0.95rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  box-shadow: var(--shadow-brand);
}

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

/* ============ Contact ============ */
#contact address {
  display: grid;
  gap: 10px;
  padding: 22px 24px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08), rgba(75, 63, 114, 0.08));
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

#contact address p {
  margin: 0;
  font-size: 0.95rem;
}

#contact address a {
  font-weight: 600;
}

/* ============ Sitemap & Links ============ */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: 999px;
  color: var(--text-secondary);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: linear-gradient(120deg, var(--brand), var(--brand-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-brand);
}

/* ============ Footer ============ */
footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 48px 20px 32px;
  margin-top: 40px;
}

footer > section {
  max-width: 1240px;
  margin: 0 auto 28px;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: border-color var(--transition), box-shadow var(--transition);
}

footer > section:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-sm);
}

footer h2 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  padding-left: 14px;
}

footer h2::before {
  width: 4px;
}

footer p {
  font-size: 0.9rem;
  margin-bottom: 6px;
}

footer > p {
  max-width: 1240px;
  margin: 0 auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
}

footer small {
  font-size: 0.82rem;
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 950;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border: none;
  border-radius: 999px;
  padding: 12px 20px;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), filter var(--transition);
}

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

#back-to-top:hover {
  filter: brightness(1.08);
  transform: translateY(-3px);
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

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

/* ============ Focus states ============ */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  #main-nav a {
    padding: 8px 9px;
    font-size: 0.86rem;
  }

  #site-search input {
    width: 110px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 62px;
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 10px 16px;
    gap: 10px;
  }

  #menu-toggle {
    display: inline-block;
  }

  #main-nav {
    order: 3;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }

  #main-nav.is-open {
    max-height: 520px;
    overflow-y: auto;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0 4px;
  }

  #main-nav a {
    padding: 11px 14px;
    font-size: 0.95rem;
  }

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

  .header-tools {
    margin-left: auto;
  }

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

  main {
    padding: 18px 16px 56px;
  }

  main > section {
    margin-bottom: 40px;
  }

  .banner-carousel {
    grid-template-columns: 1fr;
  }

  #hero {
    padding: 24px 18px 30px;
  }

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

  #back-to-top {
    right: 14px;
    bottom: 14px;
    padding: 11px 16px;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  #site-search {
    padding-left: 10px;
  }

  #site-search input {
    width: 96px;
    font-size: 0.85rem;
  }

  #site-search button {
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 7px 11px;
    font-size: 0.8rem;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stat {
    padding: 16px 8px;
  }

  main > section:not(#hero):not(#anchor-nav) {
    padding: 18px 16px;
  }

  #faq summary {
    padding: 14px 42px 14px 16px;
    font-size: 0.93rem;
  }

  #howto ol li {
    padding: 12px 14px 12px 54px;
    font-size: 0.9rem;
  }

  footer {
    padding: 32px 16px 24px;
  }

  footer > section {
    padding: 16px 18px;
  }
}

@media (max-width: 420px) {
  .header-inner {
    gap: 8px;
  }

  .brand-name {
    display: none;
  }

  #site-search input {
    width: 76px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }
}