:root {
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.14);
  --text: #16203a;
  --text-soft: #4a5670;
  --text-muted: #6b7690;
  --accent: #3d5afe;
  --accent-2: #7c4dff;
  --accent-3: #f5c451;
  --accent-soft: rgba(61, 90, 254, 0.1);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --header-h: 68px;
  --gradient-hero: linear-gradient(135deg, #1b2f5c 0%, #2a4a8f 45%, #4f7cff 100%);
  --gradient-accent: linear-gradient(135deg, #3d5afe 0%, #7c4dff 100%);
  --gradient-warm: linear-gradient(135deg, #f5c451 0%, #ff8a65 100%);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
}

html[data-theme="dark"] {
  --bg: #0b1120;
  --bg-soft: #111a2e;
  --bg-elevated: rgba(23, 33, 54, 0.72);
  --bg-glass: rgba(23, 33, 54, 0.5);
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.24);
  --text: #e8edf7;
  --text-soft: #b6c1d6;
  --text-muted: #8b98b0;
  --accent: #7c9bff;
  --accent-2: #a98bff;
  --accent-soft: rgba(124, 155, 255, 0.14);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1b2f5c 50%, #2a4a8f 100%);
}

*,
*::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% 0%,
      rgba(61, 90, 254, 0.08),
      transparent 42%
    ),
    radial-gradient(circle at 88% 8%, rgba(124, 77, 255, 0.08), transparent 40%);
  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(--accent);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--accent-2);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

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

h1 {
  font-size: clamp(1.7rem, 4vw, 2.7rem);
}

h2 {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: var(--gradient-accent);
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--text);
}

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

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

li {
  margin-bottom: 0.4em;
}

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

time {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

blockquote {
  margin: 0 0 1.2em;
  padding: 18px 22px;
  border-left: 4px solid var(--accent);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin: 0;
}

.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(--bg-elevated);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

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

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.brand svg {
  transition: transform var(--transition);
}

.brand:hover svg {
  transform: rotate(-12deg) scale(1.08);
}

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

nav[aria-label="主导航"] {
  flex: 1 1 auto;
}

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

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: inline-block;
  padding: 6px 11px;
  font-size: 0.9rem;
  color: var(--text-soft);
  border-radius: 999px;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

.main-nav a:hover {
  background: var(--accent-soft);
  color: var(--accent);
  transform: translateY(-1px);
}

.site-search {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 1 260px;
}

.site-search input {
  flex: 1;
  min-width: 0;
  padding: 9px 14px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

.site-search input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.site-search button,
#theme-toggle,
#menu-toggle {
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: 999px;
  padding: 9px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--transition), box-shadow var(--transition),
    filter var(--transition);
  box-shadow: 0 4px 14px rgba(61, 90, 254, 0.28);
}

.site-search button:hover,
#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
  box-shadow: 0 8px 22px rgba(61, 90, 254, 0.36);
}

.site-search button:active,
#theme-toggle:active,
#menu-toggle:active {
  transform: translateY(0);
}

#theme-toggle {
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border-strong);
  box-shadow: none;
}

#theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
}

/* ============ Main / Sections ============ */
main {
  display: block;
}

main > section,
main > nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

main > section {
  padding-top: 56px;
  padding-bottom: 56px;
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

main > section:nth-of-type(even) {
  position: relative;
}

main > section > h2 {
  margin-top: 0;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ Hero ============ */
.hero {
  position: relative;
  max-width: none !important;
  padding: 64px 20px 56px !important;
  background: var(--gradient-hero);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 70%;
  background: radial-gradient(
    ellipse at 30% 20%,
    rgba(245, 196, 81, 0.28),
    transparent 60%
  );
  pointer-events: none;
  z-index: -1;
}

.hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -30%;
  width: 520px;
  height: 520px;
  background: radial-gradient(
    circle,
    rgba(124, 155, 255, 0.35),
    transparent 65%
  );
  pointer-events: none;
  z-index: -1;
}

.hero > * {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.hero h1 {
  color: #fff;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.3);
  margin-bottom: 0.5em;
}

.hero-lead {
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  max-width: 900px;
  line-height: 1.85;
}

.hero-lead strong {
  color: var(--accent-3);
  font-weight: 700;
}

/* ============ Carousel ============ */
.hero-carousel {
  position: relative;
  margin-top: 36px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 800 / 340;
  min-height: 180px;
}

.slide {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.7s ease, transform 0.9s ease;
  pointer-events: none;
}

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

.slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slide figcaption {
  position: absolute;
  left: 20px;
  bottom: 16px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.carousel-controls {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: flex;
  gap: 8px;
  z-index: 2;
}

.carousel-controls button {
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  padding: 7px 16px;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--transition), transform var(--transition);
}

.carousel-controls button:hover {
  background: rgba(255, 255, 255, 0.32);
  transform: translateY(-2px);
}

/* ============ Hero Stats ============ */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 12px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  transition: transform var(--transition), background var(--transition);
  text-align: center;
}

.stat:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.18);
}

.stat .num {
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 800;
  color: var(--accent-3);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.stat span:last-child {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  margin-top: 6px;
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding-top: 24px !important;
  padding-bottom: 0 !important;
}

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

.breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-muted);
  opacity: 0.6;
}

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

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

/* ============ Anchor Nav ============ */
.anchor-nav {
  padding-top: 20px !important;
  padding-bottom: 8px !important;
}

.anchor-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 14px;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.anchor-nav li {
  margin: 0;
}

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

.anchor-nav a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(61, 90, 254, 0.3);
}

/* ============ Content Cards ============ */
main > section[id] {
  position: relative;
}

main > section[id]:not(.hero) {
  margin-top: 24px;
  margin-bottom: 24px;
  padding: 40px clamp(20px, 4vw, 44px);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition),
    border-color var(--transition);
}

main > section[id]:not(.hero):hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

main > section[id]:not(.hero) h2 {
  margin-bottom: 1.1em;
}

main > section[id]:not(.hero) h3 {
  margin-top: 1.6em;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--border);
}

main > section[id]:not(.hero) h3:first-of-type {
  margin-top: 0.4em;
}

/* ============ News & Articles ============ */
#news article,
#articles article {
  position: relative;
  padding: 22px 24px;
  margin-bottom: 16px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#news article:hover::before,
#articles article:hover::before {
  opacity: 1;
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
  font-size: 1.12rem;
}

#news article p:last-child,
#articles article p:last-child {
  margin-bottom: 0;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  transition: all var(--transition);
}

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

#articles article a:hover {
  background: var(--gradient-accent);
  color: #fff;
  transform: translateX(2px);
}

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

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  padding: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition),
    background var(--transition);
}

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

#faq details[open] {
  border-color: var(--accent);
  box-shadow: 0 6px 22px var(--accent-soft);
  background: var(--bg-soft);
}

#faq summary {
  position: relative;
  padding: 16px 48px 16px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  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(--accent);
  line-height: 1;
  transition: transform var(--transition);
}

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

#faq summary:hover {
  color: var(--accent);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 0.94rem;
  color: var(--text-soft);
  animation: fadeIn 0.35s ease both;
}

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

/* ============ HowTo Steps ============ */
#howto ol {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0 0 1.2em;
  display: grid;
  gap: 12px;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 16px 20px 16px 62px;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  transition: transform var(--transition), border-color var(--transition),
    box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: 0 4px 12px rgba(61, 90, 254, 0.3);
}

#howto ol li:hover {
  transform: translateX(4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* ============ Contact ============ */
#contact ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-bottom: 1.6em;
}

#contact ul li {
  margin: 0;
  padding: 14px 18px;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--text-soft);
  transition: transform var(--transition), border-color var(--transition);
}

#contact ul li:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

#contact ul li a {
  font-weight: 600;
}

/* ============ 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: 7px 16px;
  font-size: 0.86rem;
  color: var(--text-soft);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(61, 90, 254, 0.3);
}

/* ============ Legal ============ */
#legal h3 {
  margin-top: 1.4em;
}

#legal p:last-child {
  margin-bottom: 0;
  padding: 14px 18px;
  background: var(--accent-soft);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-soft);
}

/* ============ Footer ============ */
footer {
  margin-top: 48px;
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.82);
  padding: 48px 20px 40px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  text-align: center;
}

.footer-inner p {
  margin: 0 0 10px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
}

.footer-inner p:first-child {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}

.footer-inner p:last-child {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ============ Back to Top ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  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(1.1);
  transform: translateY(-3px);
}

/* ============ Scroll Reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

/* ============ Scrollbar ============ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
  border: 2px solid var(--bg);
}

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

/* ============ Selection ============ */
::selection {
  background: var(--accent);
  color: #fff;
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 12px;
  }

  .main-nav a {
    padding: 6px 9px;
    font-size: 0.85rem;
  }

  .site-search {
    flex-basis: 200px;
  }

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

@media (max-width: 860px) {
  #menu-toggle {
    display: inline-block;
    margin-left: auto;
  }

  nav[aria-label="主导航"] {
    order: 10;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }

  nav[aria-label="主导航"].is-open {
    max-height: 640px;
  }

  .main-nav {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0 14px;
  }

  .main-nav a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
  }

  .site-search {
    order: 11;
    flex-basis: 100%;
    margin-bottom: 14px;
  }

  #theme-toggle {
    order: 2;
  }

  .header-inner {
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .hero {
    padding-top: 44px !important;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }

  main > section[id]:not(.hero) {
    padding: 30px 22px;
    border-radius: var(--radius-lg);
  }

  .hero-carousel {
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

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

  .stat {
    padding: 14px 8px;
  }

  .stat span:last-child {
    font-size: 0.76rem;
  }

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

  .carousel-controls button {
    padding: 6px 12px;
    font-size: 0.76rem;
  }

  .slide figcaption {
    left: 12px;
    bottom: 12px;
    font-size: 0.76rem;
    padding: 5px 12px;
  }

  .anchor-nav ul {
    padding: 10px;
    gap: 6px;
  }

  .anchor-nav a {
    padding: 5px 11px;
    font-size: 0.8rem;
  }

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

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

  main > section[id]:not(.hero) {
    padding: 24px 18px;
    margin-top: 16px;
    margin-bottom: 16px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  #news article,
  #articles article {
    padding: 18px;
  }

  #faq summary {
    padding: 14px 42px 14px 16px;
    font-size: 0.92rem;
  }

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

  footer {
    padding: 36px 18px 28px;
  }
}

@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;
  }
}

@media print {
  #site-header,
  #back-to-top,
  .hero-carousel,
  .anchor-nav,
  .site-search {
    display: none !important;
  }

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

  main > section[id]:not(.hero) {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}