:root {
  --primary: #c8102e;
  --primary-light: #e63950;
  --primary-dark: #9a0c23;
  --accent: #ffb703;
  --accent-soft: #ffe3e8;
  --bg: #f7f5f7;
  --bg-alt: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.9);
  --text: #23181b;
  --text-soft: #5c4a4f;
  --text-muted: #8a767b;
  --border: rgba(200, 16, 46, 0.12);
  --border-soft: rgba(35, 24, 27, 0.08);
  --shadow-sm: 0 2px 8px rgba(35, 24, 27, 0.06);
  --shadow-md: 0 8px 28px rgba(35, 24, 27, 0.1);
  --shadow-lg: 0 18px 48px rgba(35, 24, 27, 0.14);
  --shadow-primary: 0 10px 30px rgba(200, 16, 46, 0.24);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --max-width: 1200px;
  --header-h: 64px;
  --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

[data-theme="dark"] {
  --primary: #ff4d67;
  --primary-light: #ff7088;
  --primary-dark: #d92b46;
  --accent: #ffc94d;
  --accent-soft: rgba(255, 77, 103, 0.16);
  --bg: #0f0b0d;
  --bg-alt: #171114;
  --bg-glass: rgba(23, 17, 20, 0.72);
  --bg-glass-strong: rgba(23, 17, 20, 0.9);
  --text: #f3ecee;
  --text-soft: #c7b8bc;
  --text-muted: #9a888d;
  --border: rgba(255, 77, 103, 0.22);
  --border-soft: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  --shadow-primary: 0 10px 30px rgba(255, 77, 103, 0.28);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --primary: #ff4d67;
    --primary-light: #ff7088;
    --primary-dark: #d92b46;
    --accent: #ffc94d;
    --accent-soft: rgba(255, 77, 103, 0.16);
    --bg: #0f0b0d;
    --bg-alt: #171114;
    --bg-glass: rgba(23, 17, 20, 0.72);
    --bg-glass-strong: rgba(23, 17, 20, 0.9);
    --text: #f3ecee;
    --text-soft: #c7b8bc;
    --text-muted: #9a888d;
    --border: rgba(255, 77, 103, 0.22);
    --border-soft: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
    --shadow-primary: 0 10px 30px rgba(255, 77, 103, 0.28);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% 4%, rgba(200, 16, 46, 0.08), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(255, 183, 3, 0.08), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(200, 16, 46, 0.05), transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 12% 4%, rgba(255, 77, 103, 0.12), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(255, 201, 77, 0.07), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(255, 77, 103, 0.08), transparent 50%);
}

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

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

a:hover {
  color: var(--primary-dark);
}

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

h1 { font-size: clamp(1.7rem, 4.2vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.3rem); }

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

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4em;
}

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

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin: 0 0 0.6em;
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 0;
}

time {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5em;
}

figure {
  margin: 1.6em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

figcaption {
  padding: 0.8em 1.2em;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5em 1.5em;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.5em 1.5em;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-soft);
}

.topbar span:first-child {
  color: var(--primary);
  font-weight: 600;
  letter-spacing: 0.02em;
}

nav[aria-label="主导航"] {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2em;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.6em 1.5em;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

nav[aria-label="主导航"]::-webkit-scrollbar {
  display: none;
}

nav[aria-label="主导航"] a {
  position: relative;
  flex: 0 0 auto;
  padding: 0.5em 0.9em;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition), transform var(--transition);
}

nav[aria-label="主导航"] a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

nav[aria-label="主导航"] a:hover,
nav[aria-label="主导航"] a:focus-visible {
  color: var(--primary);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

nav[aria-label="主导航"] a:hover::after,
nav[aria-label="主导航"] a:focus-visible::after {
  width: 60%;
}

form[role="search"] {
  display: flex;
  gap: 0.5em;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5em 0.8em;
  align-items: center;
}

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

form[role="search"] input[type="search"] {
  flex: 1;
  min-width: 0;
  padding: 0.65em 1.1em;
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--text);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

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

form[role="search"] input[type="search"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.14);
  background: var(--bg-alt);
}

form[role="search"] button {
  flex: 0 0 auto;
  padding: 0.65em 1.5em;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: var(--shadow-primary);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

form[role="search"] button:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 14px 36px rgba(200, 16, 46, 0.34);
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5em 1.5em 3em;
}

section {
  margin-bottom: 2.5em;
  padding: 2em;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

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

section > h2 {
  position: relative;
  padding-left: 1em;
  margin-bottom: 1.2em;
}

section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--primary), var(--accent));
}

section > h3 {
  margin-top: 1.4em;
  color: var(--primary);
}

#home {
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  overflow: visible;
}

#home > h1 {
  padding: 1.4em 1.6em 1em;
  margin-bottom: 0;
  color: #fff;
  background: linear-gradient(135deg, #c8102e 0%, #e63950 38%, #ff6b81 68%, #ffb703 100%);
  background-size: 200% 200%;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  box-shadow: var(--shadow-primary);
  animation: gradientShift 12s ease infinite;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
}

#home > p {
  padding: 0 1.6em;
  margin: 0;
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

#home > p:first-of-type {
  padding-top: 1.2em;
}

#home > p:last-of-type {
  padding-bottom: 1.2em;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5em;
}

#home figure {
  margin: 0 0 1.5em;
  border-radius: var(--radius-xl);
}

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

.banner-carousel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1em;
  margin-bottom: 1.5em;
}

.banner-carousel .slide {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  padding: 1.4em 1.2em;
  font-size: 1.02rem;
  font-weight: 600;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, rgba(200, 16, 46, 0.92), rgba(230, 57, 80, 0.85));
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.banner-carousel .slide:nth-child(2) {
  background: linear-gradient(135deg, rgba(154, 12, 35, 0.92), rgba(255, 107, 129, 0.85));
}

.banner-carousel .slide:nth-child(3) {
  background: linear-gradient(135deg, rgba(255, 183, 3, 0.92), rgba(230, 57, 80, 0.85));
}

.banner-carousel .slide::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.28), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition), transform var(--transition);
  transform: scale(0.6);
}

.banner-carousel .slide:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.banner-carousel .slide:hover::before {
  opacity: 1;
  transform: scale(1);
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1em;
  margin: 0;
  padding: 0;
  list-style: none;
}

.stats li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2em;
  margin: 0;
  padding: 1.4em 1em;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-soft);
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stats li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

.stats strong {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.1;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary);
}

#about h3,
#products h3,
#solutions h3,
#cases h3,
#knowledge h3,
#howto h3 {
  padding-left: 0.7em;
  border-left: 3px solid var(--accent);
}

#products > p:last-of-type {
  padding: 1.2em 1.4em;
  background: var(--accent-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

#cases blockquote {
  margin: 1em 0;
  background: var(--bg-alt);
}

#news article,
#articles article {
  position: relative;
  margin: 0 0 1.2em;
  padding: 1.4em 1.6em;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

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

#news article:hover::before,
#articles article:hover::before {
  transform: scaleX(1);
}

#news article h3,
#articles article h3 {
  margin-bottom: 0.4em;
  font-size: 1.12rem;
  transition: color var(--transition);
}

#news article:hover h3,
#articles article:hover h3 {
  color: var(--primary);
}

#articles article p {
  margin-bottom: 0.8em;
  font-size: 0.95rem;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  padding: 0.4em 1em;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--accent-soft);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

#articles article a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  transform: translateX(3px);
  box-shadow: var(--shadow-primary);
}

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

#faq details {
  margin-bottom: 0.8em;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

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

#faq summary {
  position: relative;
  padding: 1em 2.8em 1em 1.3em;
  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: 1.1em;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition);
}

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

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

#faq details p {
  margin: 0;
  padding: 0 1.3em 1.2em;
  font-size: 0.94rem;
  animation: fadeUp 0.35s ease both;
}

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

#howto ol li {
  position: relative;
  padding: 0.7em 1em 0.7em 3.2em;
  margin-bottom: 0.6em;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  counter-increment: step;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.9em;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.7em;
  height: 1.7em;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 50%;
  box-shadow: var(--shadow-primary);
}

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

#contact address {
  font-style: normal;
  padding: 1.4em 1.6em;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

#contact address p {
  margin: 0 0 0.5em;
  font-size: 0.95rem;
}

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

#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em;
  padding: 0;
  margin: 0;
  list-style: none;
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 0.45em 1.1em;
  font-size: 0.9rem;
  color: var(--text-soft);
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  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: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary);
}

footer {
  margin-top: 2em;
  padding: 2.5em 1.5em 6em;
  background: var(--bg-alt);
  border-top: 1px solid var(--border-soft);
  box-shadow: inset 0 1px 0 var(--border-soft);
}

footer section {
  max-width: var(--max-width);
  margin: 0 auto 1.6em;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  animation: none;
}

footer section:hover {
  box-shadow: none;
}

footer section h2 {
  position: relative;
  padding-left: 0.9em;
  margin-bottom: 0.7em;
  font-size: 1.05rem;
}

footer section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--primary), var(--accent));
}

footer section p {
  margin: 0 0 0.5em;
  font-size: 0.9rem;
  color: var(--text-muted);
}

footer nav[aria-label="页脚导航"] {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6em 1.4em;
  max-width: var(--max-width);
  margin: 1.5em auto 0;
  padding: 1.2em 0 0;
  border-top: 1px solid var(--border-soft);
}

footer nav[aria-label="页脚导航"] a {
  font-size: 0.88rem;
  color: var(--text-soft);
  transition: color var(--transition);
}

footer nav[aria-label="页脚导航"] a:hover {
  color: var(--primary);
}

button#back-to-top,
button#theme-toggle,
button#menu-toggle {
  position: fixed;
  z-index: 120;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: var(--shadow-primary);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition), filter var(--transition);
}

button#back-to-top:hover,
button#theme-toggle:hover,
button#menu-toggle:hover {
  transform: translateY(-3px) scale(1.04);
  filter: brightness(1.1);
  box-shadow: 0 16px 40px rgba(200, 16, 46, 0.4);
}

button#back-to-top:active,
button#theme-toggle:active,
button#menu-toggle:active {
  transform: translateY(0) scale(0.98);
}

button#back-to-top {
  right: 1.2em;
  bottom: 1.2em;
  width: 3.2em;
  height: 3.2em;
  padding: 0;
  font-size: 0.75rem;
  border-radius: 50%;
  letter-spacing: 0.02em;
  writing-mode: horizontal-tb;
  text-align: center;
  line-height: 1.1;
}

button#theme-toggle {
  right: 1.2em;
  bottom: 5.2em;
  padding: 0.7em 1.2em;
}

button#menu-toggle {
  display: none;
  left: 1.2em;
  bottom: 1.2em;
  padding: 0.7em 1.2em;
}

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

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(200, 16, 46, 0.3); }
  50% { box-shadow: 0 0 0 10px rgba(200, 16, 46, 0); }
}

section:nth-of-type(2) { animation-delay: 0.05s; }
section:nth-of-type(3) { animation-delay: 0.1s; }
section:nth-of-type(4) { animation-delay: 0.15s; }
section:nth-of-type(5) { animation-delay: 0.2s; }
section:nth-of-type(6) { animation-delay: 0.25s; }
section:nth-of-type(7) { animation-delay: 0.3s; }
section:nth-of-type(8) { animation-delay: 0.35s; }
section:nth-of-type(9) { animation-delay: 0.4s; }
section:nth-of-type(10) { animation-delay: 0.45s; }
section:nth-of-type(11) { animation-delay: 0.5s; }
section:nth-of-type(12) { animation-delay: 0.55s; }
section:nth-of-type(13) { animation-delay: 0.6s; }
section:nth-of-type(14) { animation-delay: 0.65s; }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 900px) {
  main {
    padding: 1.2em 1em 3em;
  }
  section {
    padding: 1.5em 1.2em;
    border-radius: var(--radius-lg);
    margin-bottom: 1.6em;
  }
  #home > h1 {
    padding: 1.2em 1.2em 0.9em;
  }
  #home > p {
    padding-left: 1.2em;
    padding-right: 1.2em;
  }
  .topbar {
    font-size: 0.72rem;
    padding: 0.5em 1em;
  }
  nav[aria-label="主导航"] {
    padding: 0.5em 1em;
  }
  form[role="search"] {
    padding: 0 1em 0.7em;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }
  header {
    position: sticky;
  }
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2em;
  }
  nav[aria-label="主导航"] {
    gap: 0.1em;
    padding: 0.4em 0.7em;
  }
  nav[aria-label="主导航"] a {
    padding: 0.45em 0.65em;
    font-size: 0.85rem;
  }
  form[role="search"] {
    padding: 0 0.7em 0.7em;
    gap: 0.4em;
  }
  form[role="search"] input[type="search"] {
    padding: 0.6em 0.9em;
    font-size: 0.88rem;
  }
  form[role="search"] button {
    padding: 0.6em 1.1em;
    font-size: 0.88rem;
  }
  main {
    padding: 1em 0.7em 2.5em;
  }
  section {
    padding: 1.2em 1em;
    border-radius: var(--radius-md);
    margin-bottom: 1.2em;
  }
  section > h2 {
    padding-left: 0.8em;
  }
  section > h2::before {
    width: 4px;
  }
  #home > h1 {
    padding: 1.1em 1em 0.8em;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }
  #home > p {
    padding-left: 1em;
    padding-right: 1em;
  }
  #home > p:last-of-type {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
  }
  #home figure {
    border-radius: var(--radius-md);
  }
  .banner-carousel {
    grid-template-columns: 1fr;
    gap: 0.7em;
  }
  .banner-carousel .slide {
    min-height: 90px;
    padding: 1em;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.7em;
  }
  .stats li {
    padding: 1em 0.6em;
    border-radius: var(--radius-md);
  }
  #news article,
  #articles article {
    padding: 1.1em 1.1em;
    border-radius: var(--radius-md);
  }
  #faq summary {
    padding: 0.9em 2.5em 0.9em 1em;
    font-size: 0.92rem;
  }
  #faq details p {
    padding: 0 1em 1em;
    font-size: 0.9rem;
  }
  #howto ol li {
    padding: 0.6em 0.8em 0.6em 2.8em;
  }
  #howto ol li::before {
    left: 0.7em;
    width: 1.5em;
    height: 1.5em;
    font-size: 0.78rem;
  }
  #contact address {
    padding: 1.1em 1em;
    border-radius: var(--radius-md);
  }
  footer {
    padding: 2em 1em 7em;
  }
  button#back-to-top {
    right: 0.9em;
    bottom: 0.9em;
    width: 2.8em;
    height: 2.8em;
    font-size: 0.68rem;
  }
  button#theme-toggle {
    right: 0.9em;
    bottom: 4.4em;
    padding: 0.6em 0.95em;
    font-size: 0.78rem;
  }
  button#menu-toggle {
    display: inline-flex;
    left: 0.9em;
    bottom: 0.9em;
    padding: 0.6em 0.95em;
    font-size: 0.78rem;
  }
}

@media (max-width: 380px) {
  .stats {
    grid-template-columns: 1fr;
  }
  nav[aria-label="主导航"] a {
    font-size: 0.8rem;
    padding: 0.4em 0.55em;
  }
}

@media (min-width: 1400px) {
  :root {
    --max-width: 1280px;
  }
}

@media print {
  header,
  footer nav,
  button#back-to-top,
  button#theme-toggle,
  button#menu-toggle,
  form[role="search"] {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  section {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
    animation: none;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}