:root {
  --pink: #ff6b9d;
  --pink-light: #ffb6d5;
  --pink-soft: #ffe4ef;
  --pink-deep: #e34c80;
  --accent: #a78bfa;
  --accent-2: #7dd3fc;
  --bg: #fff7fb;
  --bg-alt: #ffffff;
  --bg-soft: #fdeef5;
  --text: #3d2a35;
  --text-muted: #7a6470;
  --border: rgba(255, 107, 157, 0.18);
  --glass: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.7);
  --shadow-sm: 0 2px 10px rgba(255, 107, 157, 0.1);
  --shadow-md: 0 8px 30px rgba(255, 107, 157, 0.15);
  --shadow-lg: 0 18px 50px rgba(227, 76, 128, 0.2);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --grad-brand: linear-gradient(135deg, #ff6b9d 0%, #ff8fb8 45%, #a78bfa 100%);
  --grad-banner: linear-gradient(120deg, #ffe4ef 0%, #ffd1e6 30%, #e8d5ff 65%, #d3ecff 100%);
  --grad-soft: linear-gradient(135deg, rgba(255, 107, 157, 0.08), rgba(167, 139, 250, 0.08));
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

html[data-theme="dark"] {
  --pink: #ff7fae;
  --pink-light: #ff9ec4;
  --pink-soft: #3a2230;
  --pink-deep: #ff5c94;
  --accent: #b9a3ff;
  --accent-2: #7dd3fc;
  --bg: #16111a;
  --bg-alt: #1e1724;
  --bg-soft: #241a2c;
  --text: #f3e9f0;
  --text-muted: #b6a4b2;
  --border: rgba(255, 127, 174, 0.22);
  --glass: rgba(40, 28, 46, 0.55);
  --glass-border: rgba(255, 127, 174, 0.2);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.6);
  --grad-brand: linear-gradient(135deg, #ff5c94 0%, #b06bff 100%);
  --grad-banner: linear-gradient(120deg, #2a1b30 0%, #3a2244 35%, #2c2447 65%, #1f2a3d 100%);
  --grad-soft: linear-gradient(135deg, rgba(255, 127, 174, 0.1), rgba(185, 163, 255, 0.1));
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  -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(255, 107, 157, 0.1), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(167, 139, 250, 0.1), transparent 45%),
    radial-gradient(circle at 50% 100%, rgba(125, 211, 252, 0.08), transparent 55%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--pink-deep);
  text-decoration: none;
  transition: color var(--transition);
}

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

::selection {
  background: var(--pink);
  color: #fff;
}

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

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.2px;
}

h1 {
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  margin: 0 0 1rem;
  position: relative;
  padding-left: 1.1rem;
}

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

h3 {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  margin: 1.6rem 0 0.6rem;
  color: var(--pink-deep);
}

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

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.4rem;
}

strong {
  color: var(--pink-deep);
  font-weight: 800;
}

/* ===== Header ===== */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.7rem clamp(1rem, 3vw, 2.2rem);
  background: var(--glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.brand a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text);
  letter-spacing: 1px;
}

.brand svg {
  filter: drop-shadow(0 3px 8px rgba(255, 107, 157, 0.4));
  transition: transform var(--transition);
}

.brand a:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

header nav[aria-label="主导航"] {
  flex: 1 1 320px;
}

header nav[aria-label="主导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition);
  position: relative;
}

header nav[aria-label="主导航"] a:hover,
header nav[aria-label="主导航"] a:focus-visible {
  color: #fff;
  background: var(--grad-brand);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.search form {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.3rem 0.25rem 0.9rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.search form:focus-within {
  border-color: var(--pink);
  box-shadow: 0 0 0 4px rgba(255, 107, 157, 0.15);
}

.search label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.search input[type="search"] {
  border: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 0.88rem;
  padding: 0.35rem 0;
  min-width: 0;
  width: clamp(120px, 18vw, 200px);
  outline: none;
}

.search input::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.search button,
#theme-toggle,
#menu-toggle {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-pill);
  padding: 0.45rem 1rem;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  white-space: nowrap;
}

.search button:hover,
#theme-toggle:hover,
#menu-toggle:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.05);
}

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

#theme-toggle {
  background: var(--bg-alt);
  color: var(--pink-deep);
  border: 1px solid var(--border);
}

#menu-toggle {
  display: none;
}

/* ===== Breadcrumb ===== */
nav[aria-label="面包屑导航"] {
  max-width: 1180px;
  margin: 1rem auto 0;
  padding: 0 clamp(1rem, 3vw, 2.2rem);
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0.5rem 1rem;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  color: var(--text-muted);
  width: fit-content;
  box-shadow: var(--shadow-sm);
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  margin-right: 0.4rem;
  color: var(--pink);
  font-weight: 800;
}

nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--pink-deep);
  font-weight: 700;
}

/* ===== Main layout ===== */
main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2.2rem) 3rem;
}

main > section,
main > nav[aria-label="页面锚点导航"] {
  margin-top: 2.2rem;
  padding: clamp(1.2rem, 3vw, 2.2rem);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

main > section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 107, 157, 0.35);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main > section:nth-of-type(1) { animation-delay: 0.05s; }
main > section:nth-of-type(2) { animation-delay: 0.1s; }
main > section:nth-of-type(3) { animation-delay: 0.15s; }
main > section:nth-of-type(4) { animation-delay: 0.2s; }
main > section:nth-of-type(5) { animation-delay: 0.25s; }
main > section:nth-of-type(6) { animation-delay: 0.3s; }

/* ===== Hero ===== */
#hero {
  background: var(--grad-banner);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

#hero::before,
#hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  pointer-events: none;
}

#hero::before {
  width: 320px;
  height: 320px;
  background: var(--pink);
  top: -120px;
  right: -80px;
  animation: floatBlob 14s ease-in-out infinite;
}

#hero::after {
  width: 260px;
  height: 260px;
  background: var(--accent);
  bottom: -120px;
  left: -60px;
  animation: floatBlob 18s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, 25px) scale(1.12); }
}

#hero h1 {
  position: relative;
  z-index: 1;
}

#hero > p {
  position: relative;
  z-index: 1;
  max-width: 760px;
  color: var(--text);
  font-size: 0.98rem;
}

.banner {
  position: relative;
  z-index: 1;
  margin: 1.4rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--bg-alt);
}

.banner figure {
  margin: 0;
  position: relative;
}

.banner svg {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.banner:hover svg {
  transform: scale(1.04);
}

.banner figcaption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: rgba(255, 107, 157, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
}

.stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.9rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.stats li {
  margin: 0;
  padding: 1rem 0.8rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stats li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.stats strong {
  display: block;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.5px;
}

/* ===== Anchor nav ===== */
main > nav[aria-label="页面锚点导航"] {
  background: var(--grad-soft);
}

main > nav[aria-label="页面锚点导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

main > nav[aria-label="页面锚点导航"] a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--pink-deep);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: all var(--transition);
}

main > nav[aria-label="页面锚点导航"] a:hover,
main > nav[aria-label="页面锚点导航"] a:focus-visible {
  color: #fff;
  background: var(--grad-brand);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* ===== Articles ===== */
#articles {
  display: flex;
  flex-direction: column;
}

#articles > h2 {
  width: 100%;
}

#articles article {
  position: relative;
  margin: 0.6rem 0;
  padding: 1.2rem 1.3rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.2rem;
  bottom: 1.2rem;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  opacity: 0;
  transition: opacity var(--transition);
}

#articles article:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  background: var(--bg-alt);
}

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

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

#articles article p:nth-of-type(1) {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  background: var(--grad-brand);
  color: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

#articles article a:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#articles article a:hover::after {
  transform: translateX(4px);
}

/* ===== FAQ ===== */
#faq details {
  margin: 0.6rem 0;
  padding: 0.2rem 1.2rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

#faq details[open] {
  background: var(--bg-alt);
  border-color: var(--pink);
  box-shadow: var(--shadow-md);
}

#faq summary {
  cursor: pointer;
  padding: 0.9rem 0;
  font-weight: 700;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 2rem;
  transition: color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  line-height: 24px;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-brand);
  border-radius: 50%;
  transition: transform var(--transition);
}

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

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

#faq details p {
  padding-bottom: 0.8rem;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  animation: fadeUp 0.4s ease both;
}

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

#howto ol li {
  position: relative;
  padding: 0.7rem 1rem 0.7rem 3rem;
  margin-bottom: 0.6rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  counter-increment: step;
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 800;
  color: #fff;
  background: var(--grad-brand);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

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

/* ===== Contact ===== */
#contact ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

#contact ul li {
  padding: 0.75rem 1rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#contact ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: var(--pink);
}

/* ===== Sitemap & links ===== */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--grad-brand);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ===== Author ===== */
#author {
  background: var(--grad-soft);
}

#author p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== Footer ===== */
footer[role="contentinfo"] {
  margin-top: 3rem;
  padding: clamp(1.5rem, 4vw, 2.6rem) clamp(1rem, 3vw, 2.2rem) 1.5rem;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-top: 1px solid var(--border);
}

footer[role="contentinfo"] > section {
  max-width: 1180px;
  margin: 0 auto 1.6rem;
}

footer[role="contentinfo"] h2 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}

footer[role="contentinfo"] h3 {
  font-size: 0.95rem;
  margin: 1rem 0 0.4rem;
}

footer[role="contentinfo"] p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

footer[role="contentinfo"] > p {
  max-width: 1180px;
  margin: 1.5rem auto 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  right: clamp(0.8rem, 2vw, 1.8rem);
  bottom: clamp(0.8rem, 2vw, 1.8rem);
  z-index: 90;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.68rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-brand);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  opacity: 0.9;
  padding: 0;
  line-height: 1.1;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: var(--shadow-lg);
  opacity: 1;
}

#back-to-top:active {
  transform: translateY(0) scale(0.95);
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  header[role="banner"] {
    gap: 0.6rem;
  }

  header nav[aria-label="主导航"] {
    order: 3;
    flex-basis: 100%;
  }

  header nav[aria-label="主导航"] ul {
    gap: 0.2rem;
  }

  header nav[aria-label="主导航"] a {
    font-size: 0.82rem;
    padding: 0.3rem 0.6rem;
  }

  .search {
    flex: 1 1 auto;
  }

  .search input[type="search"] {
    width: 100%;
  }
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 130px;
  }

  header[role="banner"] {
    padding: 0.6rem 1rem;
  }

  .brand a {
    font-size: 1.1rem;
  }

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

  header nav[aria-label="主导航"] {
    display: none;
    order: 4;
    flex-basis: 100%;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
  }

  header[role="banner"].menu-open header nav[aria-label="主导航"] {
    display: block;
    animation: fadeUp 0.35s ease both;
  }

  header nav[aria-label="主导航"] ul {
    flex-direction: column;
    gap: 0.15rem;
  }

  header nav[aria-label="主导航"] a {
    display: block;
    padding: 0.55rem 0.9rem;
    font-size: 0.9rem;
  }

  .search {
    order: 5;
    flex-basis: 100%;
    display: none;
  }

  header[role="banner"].menu-open .search {
    display: block;
    padding-bottom: 0.4rem;
  }

  .search form {
    width: 100%;
  }

  main > section,
  main > nav[aria-label="页面锚点导航"] {
    margin-top: 1.4rem;
    padding: 1.1rem;
    border-radius: var(--radius-md);
  }

  h2 {
    padding-left: 0.9rem;
  }

  h2::before {
    width: 4px;
  }

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

  #articles article:hover {
    transform: translateY(-3px);
  }

  #howto ol li:hover {
    transform: translateY(-2px);
  }
}

@media (max-width: 400px) {
  body {
    font-size: 15px;
  }

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

  #back-to-top {
    width: 42px;
    height: 42px;
    font-size: 0.6rem;
  }
}

/* ===== Accessibility & motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  header[role="banner"],
  #back-to-top,
  main > nav[aria-label="页面锚点导航"] {
    display: none !important;
  }

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

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