:root {
  --primary: #3a2f6b;
  --primary-light: #5b4fa0;
  --primary-dark: #241c4a;
  --accent: #f5c542;
  --accent-soft: #ffe08a;
  --bg: #f7f6fb;
  --bg-alt: #ffffff;
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --text: #1f1a33;
  --text-soft: #4a4560;
  --text-muted: #7a7590;
  --border: rgba(58, 47, 107, 0.12);
  --border-strong: rgba(58, 47, 107, 0.22);
  --shadow-sm: 0 2px 8px rgba(36, 28, 74, 0.06);
  --shadow-md: 0 8px 28px rgba(36, 28, 74, 0.1);
  --shadow-lg: 0 18px 48px rgba(36, 28, 74, 0.16);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.45);
  --glass-blur: 16px;
  --grad-hero: linear-gradient(135deg, #3a2f6b 0%, #5b4fa0 45%, #8a6fd0 100%);
  --grad-accent: linear-gradient(135deg, #f5c542 0%, #ff9f5a 100%);
  --grad-card: linear-gradient(160deg, rgba(255,255,255,0.9) 0%, rgba(247,246,251,0.6) 100%);
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --maxw: 1180px;
  --header-h: 68px;
}

html[data-theme="dark"],
body.dark-mode,
html.dark-mode {
  --bg: #14121f;
  --bg-alt: #1c1930;
  --bg-elevated: rgba(28, 25, 48, 0.72);
  --text: #ece9f7;
  --text-soft: #c3bede;
  --text-muted: #8f89ab;
  --border: rgba(245, 197, 66, 0.14);
  --border-strong: rgba(245, 197, 66, 0.28);
  --glass-bg: rgba(28, 25, 48, 0.55);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  --grad-hero: linear-gradient(135deg, #1a1633 0%, #2e2560 50%, #4a3a8c 100%);
  --grad-card: linear-gradient(160deg, rgba(40, 35, 68, 0.9) 0%, rgba(28, 25, 48, 0.6) 100%);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #14121f;
    --bg-alt: #1c1930;
    --bg-elevated: rgba(28, 25, 48, 0.72);
    --text: #ece9f7;
    --text-soft: #c3bede;
    --text-muted: #8f89ab;
    --border: rgba(245, 197, 66, 0.14);
    --border-strong: rgba(245, 197, 66, 0.28);
    --glass-bg: rgba(28, 25, 48, 0.55);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
    --grad-hero: linear-gradient(135deg, #1a1633 0%, #2e2560 50%, #4a3a8c 100%);
    --grad-card: linear-gradient(160deg, rgba(40, 35, 68, 0.9) 0%, rgba(28, 25, 48, 0.6) 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-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 0%, rgba(91, 79, 160, 0.1), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(245, 197, 66, 0.08), transparent 40%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

body > a:first-child {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 12px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) 0;
  text-decoration: none;
  font-weight: 600;
}

body > a:first-child:focus {
  left: 0;
}

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

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--transition);
}

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

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

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin: 0 0 20px;
  background: linear-gradient(120deg, var(--primary) 0%, var(--primary-light) 60%, var(--accent) 130%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

html[data-theme="dark"] h1,
body.dark-mode h1 {
  background: linear-gradient(120deg, #b9a8ff 0%, #d8c9ff 50%, var(--accent) 120%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  margin: 0 0 18px;
  padding-bottom: 12px;
  position: relative;
}

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

section:hover > h2::after {
  width: 96px;
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  margin: 28px 0 12px;
  color: var(--text);
}

p {
  margin: 0 0 16px;
  color: var(--text-soft);
}

ul, ol {
  margin: 0 0 18px;
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 8px;
}

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

blockquote {
  margin: 16px 0;
  padding: 16px 22px;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--glass-border);
  border-right: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

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

time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  background: rgba(91, 79, 160, 0.08);
  margin-bottom: 8px;
}

/* ============ Header ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

header[role="banner"] > div {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

header[role="banner"] > div > a[href="https://qcguoxing.com/"] {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

header[role="banner"] > div > a[href="https://qcguoxing.com/"] svg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: 0 4px 14px rgba(58, 47, 107, 0.35);
  transition: transform var(--transition);
}

header[role="banner"] > div > a[href="https://qcguoxing.com/"]:hover svg {
  transform: rotate(-12deg) scale(1.06);
}

header[role="banner"] nav {
  flex: 1 1 auto;
}

header[role="banner"] nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

header[role="banner"] nav a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  color: var(--text-soft);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

header[role="banner"] nav a::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
  transform: translateX(-50%);
  transition: width var(--transition);
}

header[role="banner"] nav a:hover {
  color: var(--primary-light);
  background: rgba(91, 79, 160, 0.08);
}

header[role="banner"] nav a:hover::before {
  width: 60%;
}

header[role="banner"] form[role="search"] {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 1 260px;
  position: relative;
}

header[role="banner"] form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

header[role="banner"] input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

header[role="banner"] input[type="search"]::placeholder {
  color: var(--text-muted);
}

header[role="banner"] input[type="search"]:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(91, 79, 160, 0.18);
}

header[role="banner"] form[role="search"] button,
header[role="banner"] > div > button {
  padding: 8px 16px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--grad-hero);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

header[role="banner"] > div > button[aria-label="切换暗黑模式"] {
  background: var(--bg-elevated);
  color: var(--text-soft);
  border: 1px solid var(--border);
  display: none;
}

header[role="banner"] > div > button[aria-label="打开移动菜单"] {
  display: none;
}

header[role="banner"] form[role="search"] button:hover,
header[role="banner"] > div > button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.08);
}

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

main > nav[aria-label="面包屑导航"] {
  padding: 18px 0 6px;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
}

main > nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--text-muted);
  opacity: 0.6;
}

main > nav[aria-label="面包屑导航"] a {
  color: var(--text-muted);
}

main > nav[aria-label="面包屑导航"] a:hover {
  color: var(--accent);
}

main > nav[aria-label="面包屑导航"] [aria-current="page"] {
  color: var(--primary-light);
  font-weight: 600;
}

/* ============ Section base ============ */
main > section {
  margin: 34px 0;
  padding: 32px clamp(20px, 3vw, 40px);
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

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

/* ============ Hero ============ */
#hero {
  position: relative;
  margin-top: 22px;
  padding: clamp(36px, 5vw, 64px) clamp(22px, 4vw, 56px);
  background: var(--grad-hero);
  border: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  color: #fff;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 18% 22%, rgba(245, 197, 66, 0.22), transparent 38%),
    radial-gradient(circle at 82% 78%, rgba(138, 111, 208, 0.35), transparent 45%),
    radial-gradient(circle at 60% 10%, rgba(255, 255, 255, 0.1), transparent 30%);
  pointer-events: none;
  animation: heroGlow 12s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.08); }
}

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

#hero h1 {
  background: none;
  -webkit-text-fill-color: #fff;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.25);
}

#hero p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 78ch;
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
}

#hero > div[role="region"] {
  margin: 28px 0;
}

#hero figure {
  margin: 0 0 14px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.16);
  transition: transform var(--transition), box-shadow var(--transition);
}

#hero figure:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.4);
}

#hero figure svg {
  width: 100%;
  height: auto;
  display: block;
}

#hero figcaption {
  padding: 10px 16px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(0, 0, 0, 0.28);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

#hero > div[role="region"] > p {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.72);
}

#hero ul[aria-label="平台数据"] {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

#hero ul[aria-label="平台数据"] li {
  margin: 0;
  padding: 18px 16px;
  text-align: center;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

#hero ul[aria-label="平台数据"] li:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(245, 197, 66, 0.5);
}

#hero ul[aria-label="平台数据"] strong {
  display: block;
  margin-top: 4px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ============ Cards inside sections (articles / news) ============ */
#news article,
#articles article {
  position: relative;
  margin: 0 0 18px;
  padding: 22px 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--grad-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 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 {
  transform: scaleY(1);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

#articles article a[href="#articles"] {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-light);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition);
}

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

#articles article a[href="#articles"]:hover {
  color: #fff;
  background: var(--grad-hero);
  border-color: transparent;
  transform: translateX(2px);
}

#articles article a[href="#articles"]:hover::after {
  transform: translateX(4px);
}

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

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

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

#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), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  line-height: 22px;
  text-align: center;
  font-size: 1.1rem;
  color: var(--primary-light);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

#faq details[open] summary::after {
  content: "−";
  background: var(--grad-accent);
  color: #241c4a;
  border-color: transparent;
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  color: var(--primary-light);
  background: rgba(91, 79, 160, 0.06);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 0.92rem;
  color: var(--text-soft);
  animation: fadeSlide 0.32s ease;
}

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

/* ============ Contact / address ============ */
#contact address {
  font-style: normal;
  padding: 22px 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}

#contact address p {
  margin: 0 0 10px;
  font-size: 0.92rem;
}

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

#contact address a {
  font-weight: 600;
  color: var(--primary-light);
  border-bottom: 1px dashed var(--border-strong);
  transition: color var(--transition), border-color var(--transition);
}

#contact address a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

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

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 7px 16px;
  font-size: 0.88rem;
  color: var(--text-soft);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

/* ============ Footer ============ */
footer[role="contentinfo"] {
  position: relative;
  margin-top: 40px;
  padding: 48px 20px 32px;
  background: var(--grad-hero);
  color: rgba(255, 255, 255, 0.8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 0%, rgba(245, 197, 66, 0.14), transparent 40%),
    radial-gradient(circle at 90% 100%, rgba(138, 111, 208, 0.22), transparent 45%);
  pointer-events: none;
}

footer[role="contentinfo"] > section {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto 22px;
  padding: 0 4px;
}

footer[role="contentinfo"] h2 {
  font-size: 0.95rem;
  margin: 0 0 8px;
  padding-bottom: 8px;
  color: #fff;
  letter-spacing: 0.04em;
}

footer[role="contentinfo"] h2::after {
  width: 32px;
  height: 3px;
  background: var(--grad-accent);
}

footer[role="contentinfo"] p {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

footer[role="contentinfo"] > section:last-of-type p {
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.6);
}

/* ============ Back to top ============ */
body > button[aria-label="返回顶部"] {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 48px;
  height: 48px;
  padding: 0;
  font-size: 0;
  color: transparent;
  background: var(--grad-accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  opacity: 0.92;
}

body > button[aria-label="返回顶部"]::before {
  content: "↑";
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 48px;
  color: #241c4a;
}

body > button[aria-label="返回顶部"]:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: var(--shadow-lg);
  opacity: 1;
}

/* ============ Scroll animations ============ */
@keyframes revealUp {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}

@supports (animation-timeline: view()) {
  main > section {
    animation: revealUp linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 22%;
  }
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: revealUp 0.6s ease both;
  }
  main > section:nth-of-type(2) { animation-delay: 0.05s; }
  main > section:nth-of-type(3) { animation-delay: 0.1s; }
  main > section:nth-of-type(4) { animation-delay: 0.15s; }
  main > section:nth-of-type(5) { animation-delay: 0.2s; }
}

@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;
  }
}

/* ============ Focus visibility ============ */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  header[role="banner"] > div {
    gap: 12px;
  }
  header[role="banner"] nav ul {
    gap: 2px 4px;
  }
  header[role="banner"] nav a {
    padding: 5px 9px;
    font-size: 0.84rem;
  }
  header[role="banner"] form[role="search"] {
    flex-basis: 200px;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 60px;
  }

  header[role="banner"] > div {
    padding: 10px 16px;
    flex-wrap: wrap;
  }

  header[role="banner"] nav {
    order: 3;
    flex-basis: 100%;
    display: none;
  }

  header[role="banner"] nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0 4px;
    border-top: 1px solid var(--border);
    margin-top: 6px;
  }

  header[role="banner"] nav a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
  }

  header[role="banner"] nav a::before {
    display: none;
  }

  header[role="banner"] form[role="search"] {
    flex: 1 1 160px;
    order: 2;
  }

  header[role="banner"] > div > button[aria-label="切换暗黑模式"] {
    display: inline-block;
    order: 2;
    padding: 8px 12px;
  }

  header[role="banner"] > div > button[aria-label="打开移动菜单"] {
    display: inline-block;
    order: 2;
    padding: 8px 14px;
    background: var(--bg-elevated);
    color: var(--text-soft);
    border: 1px solid var(--border);
  }

  header[role="banner"].menu-open nav {
    display: block;
    animation: fadeSlide 0.28s ease;
  }

  main {
    padding: 0 14px 48px;
  }

  main > section {
    margin: 24px 0;
    padding: 24px 18px;
    border-radius: var(--radius);
  }

  #hero {
    padding: 32px 20px;
  }

  #hero ul[aria-label="平台数据"] {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  #hero ul[aria-label="平台数据"] strong {
    font-size: 1.25rem;
  }

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

  body > button[aria-label="返回顶部"] {
    right: 14px;
    bottom: 14px;
    width: 44px;
    height: 44px;
  }

  body > button[aria-label="返回顶部"]::before {
    line-height: 44px;
  }
}

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

  header[role="banner"] > div > a[href="https://qcguoxing.com/"] strong {
    font-size: 1rem;
  }

  header[role="banner"] > div > a[href="https://qcguoxing.com/"] svg {
    width: 34px;
    height: 34px;
  }

  header[role="banner"] form[role="search"] {
    flex-basis: 100%;
    order: 4;
    margin-top: 4px;
  }

  header[role="banner"] > div > button[aria-label="切换暗黑模式"],
  header[role="banner"] > div > button[aria-label="打开移动菜单"] {
    padding: 7px 10px;
    font-size: 0.78rem;
  }

  #hero ul[aria-label="平台数据"] {
    grid-template-columns: 1fr;
  }

  main > section {
    padding: 20px 15px;
  }

  h2::after {
    width: 40px;
  }

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

  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.88rem;
  }

  blockquote {
    padding: 14px 16px;
  }

  footer[role="contentinfo"] {
    padding: 36px 16px 24px;
  }
}

@media (hover: none) {
  #news article:hover,
  #articles article:hover,
  main > section:hover,
  #hero figure:hover {
    transform: none;
  }
}
</｜｜DSML｜｜ parameter>
</invoke>