:root {
  --c-primary: #e63946;
  --c-primary-dark: #c1121f;
  --c-primary-light: #ff6b7a;
  --c-accent: #457b9d;
  --c-accent-2: #a8dadc;
  --c-bg: #fff8f9;
  --c-bg-alt: #ffffff;
  --c-surface: rgba(255, 255, 255, 0.72);
  --c-surface-solid: #ffffff;
  --c-text: #1d1d24;
  --c-text-soft: #4a4a58;
  --c-text-muted: #737383;
  --c-border: rgba(230, 57, 70, 0.16);
  --c-border-soft: rgba(0, 0, 0, 0.07);
  --c-shadow: rgba(180, 30, 50, 0.12);
  --c-shadow-strong: rgba(180, 30, 50, 0.24);
  --gradient-hero: linear-gradient(135deg, #ffd6dc 0%, #ffe9ec 35%, #d7ecf5 100%);
  --gradient-primary: linear-gradient(135deg, #e63946 0%, #ff6b7a 55%, #ff9a76 100%);
  --gradient-accent: linear-gradient(135deg, #457b9d 0%, #6a9fc0 60%, #a8dadc 100%);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --maxw: 1180px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --blur: saturate(180%) blur(16px);
}

html[data-theme="dark"],
body.dark-mode,
html.dark-mode {
  --c-bg: #14141b;
  --c-bg-alt: #1b1b25;
  --c-surface: rgba(30, 30, 42, 0.66);
  --c-surface-solid: #1e1e2a;
  --c-text: #f1f1f6;
  --c-text-soft: #c8c8d4;
  --c-text-muted: #9a9aac;
  --c-border: rgba(255, 107, 122, 0.22);
  --c-border-soft: rgba(255, 255, 255, 0.09);
  --c-shadow: rgba(0, 0, 0, 0.4);
  --c-shadow-strong: rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #2a1620 0%, #1e1e2a 45%, #16232b 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --c-bg: #14141b;
    --c-bg-alt: #1b1b25;
    --c-surface: rgba(30, 30, 42, 0.66);
    --c-surface-solid: #1e1e2a;
    --c-text: #f1f1f6;
    --c-text-soft: #c8c8d4;
    --c-text-muted: #9a9aac;
    --c-border: rgba(255, 107, 122, 0.22);
    --c-border-soft: rgba(255, 255, 255, 0.09);
    --c-shadow: rgba(0, 0, 0, 0.4);
    --c-shadow-strong: rgba(0, 0, 0, 0.6);
    --gradient-hero: linear-gradient(135deg, #2a1620 0%, #1e1e2a 45%, #16232b 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  background-color: var(--c-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(230, 57, 70, 0.09), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(69, 123, 157, 0.1), 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(--c-primary);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--c-primary-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.75rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--c-primary);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  position: relative;
  padding-bottom: var(--space-sm);
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: var(--c-text);
}

p {
  margin: 0 0 var(--space-md);
  color: var(--c-text-soft);
}

ul, ol {
  margin: 0 0 var(--space-md);
  padding-left: 1.4rem;
  color: var(--c-text-soft);
}

li {
  margin-bottom: var(--space-xs);
}

blockquote {
  margin: var(--space-md) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--c-primary);
  border-radius: var(--radius-sm);
  background: var(--c-surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  box-shadow: 0 6px 20px var(--c-shadow);
  color: var(--c-text-soft);
  font-style: italic;
}

blockquote p {
  margin: 0;
}

details {
  margin-bottom: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--c-surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--c-border-soft);
  box-shadow: 0 4px 16px var(--c-shadow);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

details:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px var(--c-shadow-strong);
  border-color: var(--c-border);
}

details[open] {
  border-color: var(--c-border);
}

summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--c-text);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: color var(--transition);
}

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

summary::before {
  content: "+";
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 1rem;
  line-height: 1;
  transition: transform var(--transition);
}

details[open] summary::before {
  content: "−";
  transform: rotate(180deg);
}

summary:hover {
  color: var(--c-primary);
}

details p {
  margin-top: var(--space-sm);
  margin-bottom: 0;
}

article {
  position: relative;
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--c-surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--c-border-soft);
  box-shadow: 0 4px 18px var(--c-shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

article:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px var(--c-shadow-strong);
  border-color: var(--c-border);
}

article h3 {
  transition: color var(--transition);
}

article:hover h3 {
  color: var(--c-primary);
}

article a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.9rem;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

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

article a:hover,
article a:focus-visible {
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(230, 57, 70, 0.45);
  filter: brightness(1.05);
}

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

figure {
  margin: var(--space-lg) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 14px 40px var(--c-shadow);
  border: 1px solid var(--c-border-soft);
}

figcaption {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.88rem;
  color: var(--c-text-muted);
  background: var(--c-surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  text-align: center;
}

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--c-border-soft);
  box-shadow: 0 4px 24px var(--c-shadow);
  transition: background var(--transition), box-shadow var(--transition);
}

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

header[role="banner"] > div > a[aria-label="91吃瓜首页"] {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--c-text);
  white-space: nowrap;
}

header[role="banner"] > div > a[aria-label="91吃瓜首页"]:hover {
  text-decoration: none;
  color: var(--c-primary);
}

header[role="banner"] > div > a[aria-label="91吃瓜首页"] svg {
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.4);
  transition: transform var(--transition);
}

header[role="banner"] > div > a[aria-label="91吃瓜首页"]:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

nav[aria-label="主导航"] {
  flex: 1 1 auto;
  min-width: 0;
}

nav[aria-label="主导航"] ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
}

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

nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 0.45rem 0.7rem;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  color: var(--c-text-soft);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

nav[aria-label="主导航"] a:hover,
nav[aria-label="主导航"] a:focus-visible {
  background: var(--gradient-primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
}

form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 0 1 260px;
}

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

form[role="search"] input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--c-text);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius-pill);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

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

form[role="search"] input[type="search"]:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.18);
}

form[role="search"] button {
  flex: 0 0 auto;
  padding: 0.5rem 1.1rem;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

form[role="search"] button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(230, 57, 70, 0.4);
  filter: brightness(1.06);
}

form[role="search"] button:active {
  transform: translateY(0);
}

header[role="banner"] button[type="button"] {
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  font-family: inherit;
  font-weight: 600;
  color: var(--c-text-soft);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

header[role="banner"] button[type="button"]:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(69, 123, 157, 0.35);
}

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

body > a[href="#main-content"] {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 0.7rem 1.2rem;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: 0 0 var(--radius-md) 0;
  font-weight: 600;
}

body > a[href="#main-content"]:focus {
  left: 0;
}

nav[aria-label="面包屑导航"] {
  max-width: var(--maxw);
  margin: var(--space-md) auto 0;
  padding: 0 var(--space-md);
}

nav[aria-label="面包屑导航"] ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--c-text-muted);
}

nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: inline-flex;
  align-items: center;
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--c-text-muted);
  opacity: 0.6;
}

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

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

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--space-md) var(--space-md) var(--space-xl);
}

main > section {
  position: relative;
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--c-surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--c-border-soft);
  box-shadow: 0 8px 30px var(--c-shadow);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

main > section:hover {
  box-shadow: 0 14px 44px var(--c-shadow-strong);
  border-color: var(--c-border);
}

main > section#hero {
  margin-top: var(--space-md);
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--gradient-hero);
  border: none;
  box-shadow: 0 18px 50px var(--c-shadow-strong);
  overflow: hidden;
}

main > section#hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -12%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(230, 57, 70, 0.22), transparent 68%);
  pointer-events: none;
}

main > section#hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -8%;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(69, 123, 157, 0.2), transparent 68%);
  pointer-events: none;
}

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

main > section#hero h1 {
  margin-bottom: var(--space-md);
}

main > section#hero p {
  color: var(--c-text-soft);
  font-size: 1.02rem;
}

main > section#hero figure {
  margin-top: var(--space-lg);
  background: var(--c-surface);
}

main > section#hero figure svg {
  width: 100%;
  height: auto;
}

main > section#brand-intro h3,
main > section#products h3,
main > section#solutions h3,
main > section#cases h3,
main > section#howto h3,
main > section#legal h3 {
  margin-top: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 4px solid var(--c-primary);
  border-radius: 2px;
}

main > section#brand-intro h3:first-of-type,
main > section#products h3:first-of-type,
main > section#solutions h3:first-of-type,
main > section#cases h3:first-of-type {
  margin-top: var(--space-md);
}

main > section#cases blockquote {
  position: relative;
  padding-left: calc(var(--space-lg) + 1rem);
}

main > section#cases blockquote::before {
  content: "“";
  position: absolute;
  left: var(--space-md);
  top: 0.1rem;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--c-primary);
  opacity: 0.5;
  font-family: Georgia, serif;
}

main > section#news article {
  padding-left: calc(var(--space-lg) + 6px);
}

main > section#news article::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-lg);
  bottom: var(--space-lg);
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
}

main > section#news article p:first-of-type {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  margin-bottom: var(--space-xs);
}

main > section#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
}

main > section#articles > h2,
main > section#articles > p {
  grid-column: 1 / -1;
}

main > section#articles article {
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
}

main > section#articles article p:first-of-type {
  font-size: 0.82rem;
  color: var(--c-text-muted);
  margin-bottom: var(--space-xs);
}

main > section#articles article p:nth-of-type(2) {
  flex: 1 1 auto;
}

main > section#articles article a {
  align-self: flex-start;
  margin-top: auto;
}

main > section#faq details {
  background: var(--c-bg-alt);
}

main > section#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

main > section#howto ol li {
  position: relative;
  padding-left: 3rem;
  margin-bottom: var(--space-md);
  counter-increment: step;
}

main > section#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.35);
}

main > section#contact address {
  font-style: normal;
}

main > section#contact address ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-sm);
}

main > section#contact address li {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border-soft);
  font-size: 0.94rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

main > section#contact address li:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px var(--c-shadow);
  border-color: var(--c-border);
}

main > section#sitemap ul,
main > section#links ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

main > section#sitemap li,
main > section#links li {
  margin: 0;
}

main > section#sitemap a,
main > section#links a {
  display: inline-block;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border-soft);
  font-size: 0.9rem;
  color: var(--c-text-soft);
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

main > section#sitemap a:hover,
main > section#links a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(69, 123, 157, 0.35);
}

main > section#meta-info ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-sm);
}

main > section#meta-info li {
  margin: 0;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border-soft);
  font-size: 0.9rem;
  color: var(--c-text-muted);
}

footer[role="contentinfo"] {
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.08), rgba(69, 123, 157, 0.1));
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-top: 1px solid var(--c-border-soft);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}

footer[role="contentinfo"] > p {
  margin: 0 0 var(--space-md);
  font-size: 0.9rem;
  color: var(--c-text-muted);
}

footer[role="contentinfo"] nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

footer[role="contentinfo"] nav li {
  margin: 0;
}

footer[role="contentinfo"] nav a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  border-radius: var(--radius-pill);
  color: var(--c-text-soft);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

footer[role="contentinfo"] nav a:hover {
  background: var(--gradient-primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
}

body > button[aria-label="返回顶部"] {
  position: fixed;
  right: var(--space-md);
  bottom: var(--space-md);
  z-index: 90;
  width: 48px;
  height: 48px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.45);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

body > button[aria-label="返回顶部"]::before {
  content: "↑";
  font-size: 1.25rem;
  line-height: 1;
}

body > button[aria-label="返回顶部"]:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 14px 32px rgba(230, 57, 70, 0.55);
  filter: brightness(1.06);
}

body > button[aria-label="返回顶部"]:active {
  transform: translateY(0) scale(0.98);
}

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes floatSoft {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

main > section,
main > section#articles article,
main > section#news article,
main > section#faq details {
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

main > section:nth-of-type(1) { animation-delay: 0.02s; }
main > section:nth-of-type(2) { animation-delay: 0.06s; }
main > section:nth-of-type(3) { animation-delay: 0.1s; }
main > section:nth-of-type(4) { animation-delay: 0.14s; }
main > section:nth-of-type(5) { animation-delay: 0.18s; }
main > section:nth-of-type(6) { animation-delay: 0.22s; }
main > section:nth-of-type(7) { animation-delay: 0.26s; }
main > section:nth-of-type(8) { animation-delay: 0.3s; }
main > section:nth-of-type(9) { animation-delay: 0.34s; }
main > section:nth-of-type(10) { animation-delay: 0.38s; }
main > section:nth-of-type(11) { animation-delay: 0.42s; }
main > section:nth-of-type(12) { animation-delay: 0.46s; }
main > section:nth-of-type(13) { animation-delay: 0.5s; }
main > section:nth-of-type(14) { animation-delay: 0.54s; }
main > section:nth-of-type(15) { animation-delay: 0.58s; }
main > section:nth-of-type(16) { animation-delay: 0.62s; }

main > section#hero figure svg {
  animation: floatSoft 6s ease-in-out infinite;
}

@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;
  }
}

@media (max-width: 1024px) {
  header[role="banner"] > div {
    gap: var(--space-sm);
  }
  nav[aria-label="主导航"] a {
    padding: 0.4rem 0.55rem;
    font-size: 0.86rem;
  }
  form[role="search"] {
    flex-basis: 220px;
  }
}

@media (max-width: 860px) {
  header[role="banner"] > div {
    flex-wrap: wrap;
  }
  nav[aria-label="主导航"] {
    order: 5;
    flex-basis: 100%;
  }
  nav[aria-label="主导航"] ul {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.25rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }
  nav[aria-label="主导航"] a {
    white-space: nowrap;
  }
  form[role="search"] {
    flex: 1 1 200px;
  }
  main > section#articles {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }
}

@media (max-width: 640px) {
  html {
    scroll-padding-top: 130px;
  }
  body {
    font-size: 15px;
  }
  header[role="banner"] > div {
    padding: var(--space-xs) var(--space-sm);
    gap: var(--space-xs);
  }
  header[role="banner"] > div > a[aria-label="91吃瓜首页"] span {
    font-size: 1.05rem;
  }
  form[role="search"] {
    order: 4;
    flex-basis: 100%;
  }
  header[role="banner"] button[aria-label="打开移动菜单"] {
    display: inline-block;
  }
  nav[aria-label="主导航"] {
    display: none;
  }
  nav[aria-label="主导航"].is-open {
    display: block;
  }
  nav[aria-label="主导航"].is-open ul {
    flex-direction: column;
    flex-wrap: wrap;
    overflow: visible;
  }
  nav[aria-label="主导航"].is-open a {
    display: block;
    width: 100%;
    padding: 0.6rem 0.9rem;
  }
  main {
    padding: var(--space-sm) var(--space-sm) var(--space-xl);
  }
  main > section {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-top: var(--space-md);
  }
  main > section#hero {
    padding: var(--space-md);
  }
  main > section#articles {
    grid-template-columns: 1fr;
  }
  main > section#contact address ul {
    grid-template-columns: 1fr;
  }
  main > section#meta-info ul {
    grid-template-columns: 1fr;
  }
  main > section#brand-intro h3,
  main > section#products h3,
  main > section#solutions h3,
  main > section#cases h3,
  main > section#howto h3,
  main > section#legal h3 {
    padding-left: var(--space-sm);
  }
  details {
    padding: var(--space-sm) var(--space-md);
  }
  article {
    padding: var(--space-md);
  }
  blockquote {
    padding: var(--space-sm) var(--space-md);
  }
  body > button[aria-label="返回顶部"] {
    width: 44px;
    height: 44px;
    right: var(--space-sm);
    bottom: var(--space-sm);
  }
  footer[role="contentinfo"] nav ul {
    gap: var(--space-xs);
  }
}

@media (max-width: 380px) {
  h1 {
    font-size: 1.5rem;
  }
  form[role="search"] button {
    padding: 0.5rem 0.8rem;
  }
}

@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  body > button[aria-label="返回顶部"],
  body > a[href="#main-content"] {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main > section {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  a {
    color: #000;
  }
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}