:root {
  --bg: #f7f4fb;
  --bg-elev: #ffffff;
  --bg-soft: #f0eaf8;
  --text: #241a35;
  --text-soft: #5c5170;
  --text-mute: #857a99;
  --primary: #a855f7;
  --primary-deep: #7c3aed;
  --accent: #f472b6;
  --accent-soft: #fbcfe8;
  --border: rgba(124, 58, 237, 0.14);
  --border-strong: rgba(124, 58, 237, 0.28);
  --glass: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.7);
  --shadow-sm: 0 2px 8px rgba(60, 30, 100, 0.06);
  --shadow-md: 0 10px 30px rgba(60, 30, 100, 0.1);
  --shadow-lg: 0 24px 60px rgba(60, 30, 100, 0.16);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 26px;
  --radius-pill: 999px;
  --header-h: 64px;
  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --grad-banner: linear-gradient(135deg, #7c3aed 0%, #a855f7 40%, #f472b6 100%);
  --grad-soft: linear-gradient(135deg, rgba(168, 85, 247, 0.12), rgba(244, 114, 182, 0.12));
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}

html[data-theme="dark"] {
  --bg: #12101c;
  --bg-elev: #1a1728;
  --bg-soft: #221e33;
  --text: #efeaf7;
  --text-soft: #c3b9d6;
  --text-mute: #8f84a6;
  --primary: #c084fc;
  --primary-deep: #a855f7;
  --accent: #f9a8d4;
  --accent-soft: rgba(249, 168, 212, 0.16);
  --border: rgba(192, 132, 252, 0.18);
  --border-strong: rgba(192, 132, 252, 0.34);
  --glass: rgba(30, 26, 46, 0.6);
  --glass-border: rgba(192, 132, 252, 0.22);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  --grad-banner: linear-gradient(135deg, #4c1d95 0%, #7c3aed 45%, #be185d 100%);
  --grad-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.22), rgba(190, 24, 93, 0.18));
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-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(circle at 12% -8%, rgba(168, 85, 247, 0.16), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(244, 114, 182, 0.14), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(124, 58, 237, 0.08), transparent 55%);
  background-attachment: fixed;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
  overflow-x: hidden;
}

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

a {
  color: var(--primary-deep);
  text-decoration: none;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

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

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.65rem, 3.4vw, 2.6rem);
  background: var(--grad-banner);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

h2 {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  position: relative;
  padding-bottom: 0.5em;
}

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

h3 {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--text);
}

h4 {
  font-size: 1.02rem;
  color: var(--primary-deep);
}

p {
  margin: 0 0 1em;
  color: var(--text-soft);
}

ul, ol {
  margin: 0 0 1.1em;
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4em;
}

li::marker {
  color: var(--primary);
}

strong {
  color: var(--text);
  font-weight: 700;
}

blockquote {
  margin: 1.2em 0;
  padding: 1.2em 1.4em;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-left-width: 4px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

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

blockquote p {
  margin: 0 0 0.5em;
  font-style: italic;
  color: var(--text);
}

blockquote cite {
  display: block;
  font-style: normal;
  font-size: 0.9rem;
  color: var(--text-mute);
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.35s var(--ease), background 0.35s var(--ease);
}

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

.brand-bar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: var(--grad-banner);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: transform 0.3s var(--ease);
  flex-shrink: 0;
}

.logo:hover {
  transform: scale(1.06) rotate(-2deg);
}

.tagline {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-mute);
  flex: 1 1 200px;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-bar nav {
  flex: 1 1 240px;
  min-width: 0;
}

.brand-bar form {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.brand-bar label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

#site-search {
  flex: 1;
  min-width: 0;
  padding: 9px 16px;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

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

#site-search:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.16);
}

.brand-bar form button,
#theme-toggle,
#menu-toggle {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-banner);
  border: none;
  border-radius: var(--radius-pill);
  padding: 9px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), filter 0.25s var(--ease);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
}

.brand-bar form button:hover,
#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(124, 58, 237, 0.42);
  filter: brightness(1.06);
}

.brand-bar form button:active,
#theme-toggle:active,
#menu-toggle:active {
  transform: translateY(0) scale(0.97);
}

#theme-toggle {
  background: var(--bg-elev);
  color: var(--primary-deep);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}

#theme-toggle:hover {
  background: var(--bg-soft);
  box-shadow: var(--shadow-md);
}

#menu-toggle {
  display: none;
}

/* ============ Main nav ============ */
#site-header > nav[aria-label="主导航"] {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px 10px;
  border-top: 1px solid var(--border);
}

#site-header > nav[aria-label="主导航"] ul {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
}

#site-header > nav[aria-label="主导航"] li {
  margin: 0;
}

#site-header > nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 6px 13px;
  font-size: 0.87rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  transition: background 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}

#site-header > nav[aria-label="主导航"] a:hover {
  color: var(--primary-deep);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* ============ Main layout ============ */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 60px;
}

section {
  margin-bottom: 34px;
  padding: 28px clamp(18px, 3vw, 34px);
  background: var(--glass);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

section:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

/* ============ Banner ============ */
#banner {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 56px) clamp(20px, 4vw, 48px);
  background: var(--grad-banner);
  border: none;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

#banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 20%, rgba(255, 255, 255, 0.28), transparent 40%),
    radial-gradient(circle at 82% 78%, rgba(255, 255, 255, 0.18), transparent 45%);
  pointer-events: none;
}

#banner::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -140px;
  top: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22), transparent 70%);
  pointer-events: none;
  animation: floatOrb 12s ease-in-out infinite;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 30px) scale(1.12); }
}

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

#banner h1 {
  background: none;
  -webkit-text-fill-color: #fff;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
  max-width: 20em;
}

#banner > p {
  color: rgba(255, 255, 255, 0.92);
  max-width: 62ch;
  font-size: 0.98rem;
}

/* Slider */
.banner-slider {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(260px, 1fr);
  gap: 16px;
  margin: 24px 0;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.5) transparent;
}

.banner-slider::-webkit-scrollbar {
  height: 6px;
}

.banner-slider::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-pill);
}

.banner-slider .slide {
  scroll-snap-align: start;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.16);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transition: transform 0.4s var(--ease), background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.banner-slider .slide:hover {
  transform: translateY(-6px) scale(1.015);
  background: rgba(255, 255, 255, 0.26);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
}

.banner-slider .slide h2 {
  color: #fff;
  font-size: 1.15rem;
  padding-bottom: 0.4em;
  margin-bottom: 0.5em;
}

.banner-slider .slide h2::after {
  background: rgba(255, 255, 255, 0.85);
  width: 40px;
  height: 3px;
}

.banner-slider .slide p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
  margin: 0;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 10px;
}

.stats > div {
  text-align: center;
  padding: 16px 10px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.16);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.32);
  transition: transform 0.35s var(--ease), background 0.35s var(--ease);
}

.stats > div:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.26);
}

.stats strong {
  display: block;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}

.stats span {
  display: block;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.88);
  margin-top: 2px;
}

/* ============ Definition lists ============ */
dl {
  display: grid;
  grid-template-columns: minmax(96px, max-content) 1fr;
  gap: 10px 20px;
  margin: 1.2em 0;
  padding: 18px 20px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

dt {
  font-weight: 700;
  color: var(--primary-deep);
  font-size: 0.92rem;
}

dd {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
  word-break: break-word;
}

/* ============ Tables ============ */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.2em 0;
  font-size: 0.9rem;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

thead th {
  background: var(--grad-banner);
  color: #fff;
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  white-space: nowrap;
}

tbody td {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  color: var(--text-soft);
  background: var(--bg-elev);
  transition: background 0.25s var(--ease);
}

tbody tr:nth-child(even) td {
  background: var(--bg-soft);
}

tbody tr:hover td {
  background: var(--accent-soft);
}

/* ============ Articles ============ */
#articles > article {
  padding: 20px 22px;
  margin-bottom: 16px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

#articles > article:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#articles > article h3 {
  margin-bottom: 0.35em;
  transition: color 0.25s var(--ease);
}

#articles > article:hover h3 {
  color: var(--primary-deep);
}

#articles > article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-mute);
  margin-bottom: 0.6em;
}

#articles > article a {
  display: inline-block;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--grad-soft);
  border: 1px solid var(--border-strong);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

#articles > article a:hover {
  background: var(--grad-banner);
  color: #fff;
  transform: translateX(4px);
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  border-radius: var(--radius);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

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

#faq details[open] {
  border-color: var(--primary);
  box-shadow: 0 8px 26px rgba(168, 85, 247, 0.16);
}

#faq summary {
  cursor: pointer;
  padding: 15px 46px 15px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  position: relative;
  list-style: none;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1;
  color: var(--primary);
  transition: transform 0.3s var(--ease);
}

#faq details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

#faq summary:hover {
  color: var(--primary-deep);
  background: var(--grad-soft);
}

#faq details p {
  padding: 0 20px 16px;
  margin: 0;
  font-size: 0.92rem;
  animation: fadeSlide 0.4s var(--ease);
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

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

#howto ol li {
  position: relative;
  padding: 10px 14px 10px 52px;
  margin-bottom: 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

#howto ol li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  border-radius: 50%;
  background: var(--grad-banner);
  box-shadow: 0 3px 10px rgba(124, 58, 237, 0.3);
}

#howto ol li:hover {
  transform: translateX(5px);
  border-color: var(--border-strong);
  background: var(--grad-soft);
}

#howto ul li {
  padding-left: 2px;
}

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

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--grad-banner);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
}

/* ============ Legal ============ */
#legal {
  border-color: var(--border-strong);
}

#legal > p:last-of-type {
  font-size: 0.82rem;
  color: var(--text-mute);
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

/* ============ Footer ============ */
footer {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto 30px;
  padding: 30px clamp(20px, 4vw, 40px) 36px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

footer > p {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--text-mute);
}

footer > p:first-child {
  font-size: 0.98rem;
  font-weight: 600;
  background: var(--grad-banner);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

footer nav ul {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
}

footer nav li {
  margin: 0;
}

footer nav a {
  font-size: 0.85rem;
  color: var(--text-soft);
  position: relative;
}

footer nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--grad-banner);
  transition: width 0.3s var(--ease);
}

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

#back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 90;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-banner);
  border: none;
  border-radius: var(--radius-pill);
  padding: 11px 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  box-shadow: 0 10px 26px rgba(124, 58, 237, 0.36);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), visibility 0.35s var(--ease), box-shadow 0.3s var(--ease);
}

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

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(124, 58, 237, 0.48);
}

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

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

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 820px) {
  :root {
    --header-h: 56px;
  }

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

  .tagline {
    order: 3;
    flex: 1 1 100%;
    font-size: 0.76rem;
  }

  .brand-bar nav {
    order: 4;
    flex: 1 1 100%;
  }

  #theme-toggle,
  #menu-toggle {
    display: inline-block;
    padding: 8px 14px;
    font-size: 0.8rem;
  }

  #site-header > nav[aria-label="主导航"] {
    display: none;
    padding: 0 16px 12px;
    max-height: 70vh;
    overflow-y: auto;
  }

  #site-header > nav[aria-label="主导航"].is-open {
    display: block;
    animation: fadeSlide 0.3s var(--ease);
  }

  #site-header > nav[aria-label="主导航"] ul {
    flex-direction: column;
    gap: 2px;
  }

  #site-header > nav[aria-label="主导航"] a {
    display: block;
    padding: 10px 14px;
    font-size: 0.92rem;
  }

  main {
    padding: 18px 14px 46px;
  }

  section {
    padding: 22px 18px;
    border-radius: var(--radius);
    margin-bottom: 24px;
  }

  #banner {
    padding: 28px 20px;
    border-radius: var(--radius);
  }

  .banner-slider {
    grid-auto-columns: 84%;
  }

  dl {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  dt {
    margin-top: 8px;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  footer {
    margin: 0 14px 24px;
    border-radius: var(--radius);
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 9px 16px;
    font-size: 0.78rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .logo {
    font-size: 1.3rem;
  }

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

  .stats > div {
    padding: 12px 8px;
  }

  .banner-slider {
    grid-auto-columns: 90%;
  }

  #articles > article {
    padding: 16px;
  }

  #faq summary {
    padding: 13px 42px 13px 16px;
    font-size: 0.9rem;
  }

  #faq details p {
    padding: 0 16px 14px;
  }
}

/* ============ 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;
  }

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

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

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

  section {
    box-shadow: none;
    border: 1px solid #ccc;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background: #fff;
  }
}