:root {
  --brand: #1a7f6b;
  --brand-dark: #14665a;
  --brand-light: #2a9d8f;
  --brand-mint: #3aa88f;
  --accent: #e8f5f1;
  --bg: #f4faf8;
  --bg-alt: #ffffff;
  --card: rgba(255, 255, 255, 0.72);
  --card-solid: #ffffff;
  --text: #1d2b28;
  --text-soft: #4a5c58;
  --text-mute: #6f827d;
  --border: rgba(26, 127, 107, 0.16);
  --shadow: 0 8px 30px rgba(20, 102, 90, 0.10);
  --shadow-lg: 0 18px 50px rgba(20, 102, 90, 0.16);
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 26px;
  --glass-blur: 14px;
  --header-h: 132px;
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}

body.dark-mode {
  --bg: #0d1a17;
  --bg-alt: #122420;
  --card: rgba(24, 46, 41, 0.66);
  --card-solid: #16302a;
  --text: #e6f2ee;
  --text-soft: #b9cfc8;
  --text-mute: #8aa59d;
  --border: rgba(120, 200, 180, 0.18);
  --accent: #cdeee4;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.42);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.55);
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(1100px 520px at 8% -8%, rgba(42, 157, 143, 0.14), transparent 60%),
    radial-gradient(900px 480px at 100% 0%, rgba(58, 168, 143, 0.12), transparent 62%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(42, 157, 143, 0.55);
  outline-offset: 2px;
  border-radius: 6px;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.2px;
}

h1 {
  font-size: clamp(1.55rem, 3.4vw, 2.45rem);
  margin: 0 0 18px;
}

h2 {
  font-size: clamp(1.32rem, 2.4vw, 1.85rem);
  margin: 0 0 18px;
  position: relative;
  padding-left: 16px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28em;
  bottom: 0.28em;
  width: 5px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--brand-mint), var(--brand-dark));
}

h3 {
  font-size: clamp(1.08rem, 1.7vw, 1.3rem);
  margin: 26px 0 10px;
  color: var(--brand-dark);
}

body.dark-mode h3 {
  color: var(--brand-mint);
}

p {
  margin: 0 0 14px;
  color: var(--text-soft);
}

ul, ol {
  margin: 0 0 16px;
  padding-left: 22px;
  color: var(--text-soft);
}

li {
  margin-bottom: 8px;
}

strong {
  color: var(--text);
}

.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: 100;
  background: var(--card);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition), background var(--transition);
}

#site-header.sticky {
  box-shadow: var(--shadow);
  background: var(--card);
}

.brand-bar {
  max-width: 1240px;
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

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

.logo svg {
  transition: transform var(--transition);
  filter: drop-shadow(0 4px 10px rgba(26, 127, 107, 0.28));
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.05);
}

.logo-text {
  font-size: 1.22rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(120deg, var(--brand-dark), var(--brand-mint));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.slogan {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-mute);
  letter-spacing: 0.6px;
  flex: 1 1 220px;
  min-width: 0;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-left: auto;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 3px 3px 14px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.site-search:focus-within {
  border-color: var(--brand-mint);
  box-shadow: 0 0 0 4px rgba(42, 157, 143, 0.16);
}

.site-search input {
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 0.88rem;
  color: var(--text);
  width: 168px;
  padding: 6px 0;
  outline: none;
}

.site-search input::placeholder {
  color: var(--text-mute);
}

.site-search button,
#theme-toggle,
#menu-toggle {
  font: inherit;
  font-size: 0.84rem;
  cursor: pointer;
  border: 0;
  border-radius: 999px;
  padding: 8px 16px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-light), var(--brand-dark));
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  white-space: nowrap;
}

.site-search button:hover,
#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 127, 107, 0.32);
  filter: brightness(1.06);
}

#theme-toggle {
  background: linear-gradient(135deg, #4aa58f, #1a7f6b);
}

#menu-toggle {
  display: none;
  background: linear-gradient(135deg, #5ab9a2, #2a9d8f);
}

/* ============ Nav ============ */
#main-nav {
  border-top: 1px solid var(--border);
  background: transparent;
}

#main-nav ul {
  list-style: none;
  margin: 0 auto;
  padding: 0 22px;
  max-width: 1240px;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 4px;
}

#main-nav li {
  margin: 0;
}

#main-nav a {
  display: block;
  padding: 9px 12px;
  font-size: 0.86rem;
  color: var(--text-soft);
  border-radius: 10px;
  position: relative;
  transition: color var(--transition), background 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-mint), var(--brand-dark));
  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(42, 157, 143, 0.10);
}

body.dark-mode #main-nav a:hover,
body.dark-mode #main-nav a:focus-visible {
  color: var(--accent);
}

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

/* ============ Main layout ============ */
main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 22px 40px;
}

main section {
  margin: 34px 0;
  padding: 30px 30px 26px;
  background: var(--card);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), box-shadow var(--transition), border-color var(--transition);
}

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

main section:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(42, 157, 143, 0.34);
}

/* ============ Hero ============ */
#hero {
  margin-top: 26px;
  padding: 34px 30px 28px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(26, 127, 107, 0.94) 0%, rgba(42, 157, 143, 0.88) 45%, rgba(58, 168, 143, 0.82) 100%),
    radial-gradient(600px 300px at 90% 0%, rgba(232, 245, 241, 0.28), transparent 70%);
  color: #eaf7f3;
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 22px 60px rgba(20, 102, 90, 0.34);
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 245, 241, 0.22), transparent 66%);
  pointer-events: none;
}

#hero h1 {
  color: #ffffff;
  text-shadow: 0 2px 18px rgba(9, 52, 45, 0.35);
  position: relative;
}

#hero .hero-lead {
  color: rgba(234, 247, 243, 0.92);
  font-size: 1rem;
  max-width: 900px;
  position: relative;
}

#hero h2 {
  color: #fff;
}

#hero h2::before {
  background: #eaf7f3;
}

/* ============ Carousel ============ */
.carousel {
  position: relative;
  margin: 22px 0 18px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: 0 14px 40px rgba(9, 52, 45, 0.30);
  background: rgba(255, 255, 255, 0.10);
}

.carousel .slides {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  min-height: 240px;
}

.carousel .slide {
  margin: 0;
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: scale(1.03);
  transition: opacity 0.75s ease, transform 0.9s ease;
  pointer-events: none;
}

.carousel .slide.active {
  opacity: 1;
  transform: scale(1);
  position: relative;
  pointer-events: auto;
}

.carousel .slide svg {
  width: 100%;
  display: block;
}

.slide-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 30px 20px 14px;
  font-size: 0.92rem;
  color: #f2fbf8;
  background: linear-gradient(180deg, rgba(9, 52, 45, 0), rgba(9, 52, 45, 0.78));
  letter-spacing: 0.4px;
}

.carousel-controls {
  position: absolute;
  right: 14px;
  top: 14px;
  display: flex;
  gap: 8px;
  z-index: 3;
}

.carousel-controls button {
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 999px;
  padding: 6px 14px;
  color: #fff;
  background: rgba(9, 52, 45, 0.42);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: background var(--transition), transform var(--transition);
}

.carousel-controls button:hover {
  background: rgba(9, 52, 45, 0.72);
  transform: translateY(-2px);
}

/* ============ Stats ============ */
.stats {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.stats li {
  margin: 0;
  padding: 18px 12px;
  text-align: center;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.26);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--transition), background var(--transition);
}

.stats li:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.22);
}

.stats strong {
  display: block;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 1px;
  line-height: 1.2;
}

.stats span {
  display: block;
  font-size: 0.82rem;
  color: rgba(234, 247, 243, 0.86);
  margin-top: 4px;
}

/* ============ Breadcrumb ============ */
#breadcrumb {
  margin: 22px 0 0;
  padding: 12px 20px;
  box-shadow: none;
  background: transparent;
  border: 0;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  opacity: 1;
  transform: none;
}

#breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-mute);
}

#breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

#breadcrumb li + li::before {
  content: "/";
  color: var(--text-mute);
  opacity: 0.6;
}

/* ============ Timeline ============ */
.timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand-mint), rgba(42, 157, 143, 0.12));
}

.timeline li {
  position: relative;
  margin: 0 0 20px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brand-mint);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px rgba(42, 157, 143, 0.24);
}

.timeline li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow);
  border-color: rgba(42, 157, 143, 0.36);
}

.timeline h3 {
  margin-top: 0;
}

/* ============ Article cards ============ */
#news article,
#articles article {
  margin: 0 0 16px;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(42, 157, 143, 0.36);
}

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

#news article h3,
#articles article h3 {
  margin-top: 0;
}

#news article time,
#articles article time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--brand-dark);
  background: rgba(42, 157, 143, 0.12);
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 8px;
  letter-spacing: 0.4px;
}

body.dark-mode #news article time,
body.dark-mode #articles article time {
  color: var(--accent);
}

#news article a,
#articles article a {
  display: inline-block;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(42, 157, 143, 0.08);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#news article a:hover,
#articles article a:hover {
  background: linear-gradient(135deg, var(--brand-light), var(--brand-dark));
  color: #fff;
  transform: translateX(3px);
}

/* ============ Reviews ============ */
#reviews blockquote {
  margin: 0 0 16px;
  padding: 20px 24px 20px 26px;
  border-left: 4px solid var(--brand-mint);
  border-radius: var(--radius);
  background: var(--bg-alt);
  box-shadow: var(--shadow);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

#reviews blockquote::before {
  content: "\201C";
  position: absolute;
  right: 18px;
  top: 2px;
  font-size: 3.4rem;
  line-height: 1;
  color: rgba(42, 157, 143, 0.18);
  font-family: Georgia, serif;
}

#reviews blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

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

/* ============ FAQ ============ */
#faq details {
  margin: 0 0 12px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

#faq details[open] {
  border-color: rgba(42, 157, 143, 0.42);
  box-shadow: var(--shadow);
}

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

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

#faq summary:hover {
  background: rgba(42, 157, 143, 0.08);
  color: var(--brand-dark);
}

body.dark-mode #faq summary:hover {
  color: var(--accent);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--text-soft);
}

/* ============ Contact ============ */
#contact address {
  font-style: normal;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px dashed rgba(42, 157, 143, 0.42);
  margin-bottom: 16px;
}

#contact address p {
  margin: 0 0 8px;
}

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

/* ============ Sitemap / legal ============ */
#sitemap > ul {
  columns: 2;
  column-gap: 28px;
  list-style: none;
  padding: 0;
}

#sitemap > ul li {
  break-inside: avoid;
  padding: 6px 0;
}

#sitemap > ul a {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 8px;
  transition: background var(--transition), transform var(--transition);
}

#sitemap > ul a:hover {
  background: rgba(42, 157, 143, 0.12);
  transform: translateX(3px);
}

#sitemap h3 + ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap h3 + ul li {
  margin: 0;
}

#sitemap h3 + ul a {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  font-size: 0.86rem;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#sitemap h3 + ul a:hover {
  background: linear-gradient(135deg, var(--brand-light), var(--brand-dark));
  color: #fff;
  transform: translateY(-2px);
}

#legal p:last-child {
  font-size: 0.82rem;
  color: var(--text-mute);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 18px;
}

/* ============ Footer ============ */
#site-footer {
  margin-top: 20px;
  padding: 34px 22px 46px;
  text-align: center;
  color: rgba(234, 247, 243, 0.86);
  background: linear-gradient(160deg, var(--brand-dark), #0e4a41 70%, #0a3a33);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

#site-footer p {
  margin: 0 0 8px;
  color: rgba(234, 247, 243, 0.82);
  font-size: 0.88rem;
}

#site-footer p:first-child {
  font-weight: 600;
  color: #ffffff;
}

#site-footer nav ul {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
}

#site-footer nav li {
  margin: 0;
}

#site-footer nav a {
  color: rgba(234, 247, 243, 0.82);
  font-size: 0.86rem;
  padding: 4px 8px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

#site-footer nav a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 120;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
  border: 0;
  border-radius: 999px;
  padding: 12px 20px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-light), var(--brand-dark));
  box-shadow: 0 12px 30px rgba(20, 102, 90, 0.38);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

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

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(20, 102, 90, 0.48);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  :root {
    --header-h: 120px;
  }

  .brand-bar {
    gap: 12px;
  }

  .slogan {
    flex-basis: 100%;
    order: 3;
    font-size: 0.82rem;
  }

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

  .site-search input {
    width: 130px;
  }

  main section {
    padding: 26px 22px 22px;
  }

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

@media (max-width: 768px) {
  :root {
    --header-h: 112px;
    --radius-lg: 20px;
  }

  body {
    font-size: 15px;
  }

  .brand-bar {
    padding: 10px 16px;
  }

  .logo-text {
    font-size: 1.1rem;
  }

  .header-tools {
    gap: 8px;
  }

  .site-search {
    order: 3;
    width: 100%;
    padding-left: 12px;
  }

  .site-search input {
    width: 100%;
    flex: 1;
  }

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

  #menu-toggle {
    display: inline-block;
    padding: 8px 14px;
    font-size: 0.78rem;
  }

  #main-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  #main-nav.open {
    max-height: 640px;
    overflow-y: auto;
  }

  #main-nav ul {
    flex-direction: column;
    padding: 8px 16px 14px;
    gap: 2px;
  }

  #main-nav a {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

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

  main {
    padding: 0 14px 30px;
  }

  main section {
    margin: 22px 0;
    padding: 22px 18px 18px;
    border-radius: var(--radius-lg);
  }

  #hero {
    padding: 24px 18px 20px;
  }

  #hero .hero-lead {
    font-size: 0.94rem;
  }

  .carousel .slides {
    min-height: 180px;
  }

  .carousel-controls {
    right: 10px;
    top: 10px;
  }

  .carousel-controls button {
    padding: 5px 10px;
    font-size: 0.72rem;
  }

  .slide-caption {
    font-size: 0.82rem;
    padding: 24px 14px 10px;
  }

  .stats {
    gap: 10px;
  }

  .stats li {
    padding: 14px 8px;
  }

  .stats span {
    font-size: 0.76rem;
  }

  #breadcrumb {
    padding: 8px 4px;
    margin-top: 14px;
  }

  .timeline {
    padding-left: 22px;
  }

  .timeline li::before {
    left: -22px;
    width: 12px;
    height: 12px;
  }

  #news article,
  #articles article {
    padding: 16px 16px;
  }

  #sitemap > ul {
    columns: 1;
  }

  #faq summary {
    padding: 14px 44px 14px 16px;
    font-size: 0.94rem;
  }

  #faq details p {
    padding: 0 16px 16px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 10px 16px;
    font-size: 0.78rem;
  }

  #site-footer {
    padding: 26px 16px 38px;
  }
}

@media (max-width: 420px) {
  .stats {
    grid-template-columns: 1fr 1fr;
  }

  h2 {
    padding-left: 13px;
  }

  h2::before {
    width: 4px;
  }

  .logo svg {
    width: 34px;
    height: 34px;
  }
}

/* ============ Motion preferences ============ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  main section {
    opacity: 1;
    transform: none;
  }
}

/* ============ Print ============ */
@media print {
  #site-header,
  #back-to-top,
  .carousel-controls,
  .header-tools {
    display: none !important;
  }

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

  main section {
    box-shadow: none;
    border: 1px solid #ccc;
    opacity: 1;
    transform: none;
    break-inside: avoid;
  }
}