:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-card: rgba(31, 64, 104, 0.35);
  --bg-glass: rgba(26, 26, 46, 0.6);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #eaeaf2;
  --text-secondary: #a8b2d1;
  --text-muted: #6b7a99;
  --accent: #e94560;
  --accent-hover: #ff5c78;
  --accent-soft: rgba(233, 69, 96, 0.15);
  --link: #6ea8fe;
  --link-hover: #9ec5ff;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 75%, #e94560 140%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #ff7a5c 100%);
  --gradient-card: linear-gradient(160deg, rgba(31, 64, 104, 0.5) 0%, rgba(22, 33, 62, 0.6) 100%);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --max-width: 1180px;
  --header-height: 68px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f4f6fb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef2f9;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-glass: rgba(15, 15, 26, 0.08);
    --text-primary: #1a1a2e;
    --text-secondary: #4a5573;
    --text-muted: #7a86a3;
    --accent: #d63350;
    --accent-hover: #e94560;
    --accent-soft: rgba(214, 51, 80, 0.1);
    --link: #2f6fdd;
    --link-hover: #1a56c4;
    --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.08);
    --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.12);
    --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.16);
    --gradient-hero: linear-gradient(135deg, #eef2f9 0%, #e3ebf7 40%, #d9e4f5 75%, rgba(233, 69, 96, 0.25) 140%);
    --gradient-card: linear-gradient(160deg, rgba(255, 255, 255, 0.95) 0%, rgba(238, 242, 249, 0.9) 100%);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(ellipse 80% 50% at 15% -10%, rgba(233, 69, 96, 0.12), transparent 60%),
    radial-gradient(ellipse 70% 50% at 85% 0%, rgba(15, 52, 96, 0.4), transparent 55%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(31, 64, 104, 0.25), transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(1.75rem, 4.2vw, 2.75rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

h3 {
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
}

h4 {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
}

p {
  color: var(--text-secondary);
}

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

ul, ol {
  padding-left: 1.4em;
}

li {
  color: var(--text-secondary);
  margin-bottom: 0.35em;
}

li::marker {
  color: var(--accent);
}

blockquote {
  position: relative;
  margin: 1.25rem 0;
  padding: 1rem 1.25rem 1rem 2.6rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  left: 0.85rem;
  top: 0.1rem;
  font-size: 2.4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.55;
  font-family: Georgia, serif;
}

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

figure {
  margin: 1.75rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-md);
}

figure svg {
  width: 100%;
  height: auto;
}

figcaption {
  padding: 0.85rem 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-glass);
  text-align: center;
}

a[href="#main-content"] {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 999;
  padding: 0.65rem 1.25rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  transition: top var(--transition-fast);
}

a[href="#main-content"]:focus {
  top: 16px;
  color: #fff;
}

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  padding: 0.75rem clamp(1rem, 4vw, 2.5rem);
  min-height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

header[role="banner"] > div {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

header[role="banner"] > div > a {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  transition: transform var(--transition-fast);
}

header[role="banner"] > div > a:hover {
  color: var(--text-primary);
  transform: translateY(-1px);
}

header[role="banner"] > div > a svg {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.35);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

header[role="banner"] > div > a:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 6px 22px rgba(233, 69, 96, 0.55);
}

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

nav[aria-label="主导航"] ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

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

header[role="banner"] form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 1 340px;
  margin-left: auto;
}

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"] form[role="search"] input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

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

header[role="banner"] form[role="search"] input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: var(--bg-secondary);
}

header[role="banner"] form[role="search"] button {
  flex-shrink: 0;
  padding: 0.55rem 1.15rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

header[role="banner"] form[role="search"] button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(233, 69, 96, 0.45);
  filter: brightness(1.06);
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem) clamp(1rem, 4vw, 2.5rem) 3rem;
}

main > nav[aria-label="面包屑导航"] {
  margin-bottom: 1.25rem;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  font-size: 0.85rem;
}

main > nav[aria-label="面包屑导航"] li {
  display: inline-flex;
  align-items: center;
  margin: 0;
  color: var(--text-muted);
}

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

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

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(--accent);
  font-weight: 600;
}

main > section {
  position: relative;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
  padding: clamp(1.4rem, 3.5vw, 2.5rem);
  background: var(--gradient-card);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  animation: fadeUp var(--transition-slow) both;
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

main > section:hover {
  border-color: rgba(233, 69, 96, 0.22);
  box-shadow: var(--shadow-lg);
}

main > section > h2 {
  position: relative;
  margin-bottom: 1.1rem;
  padding-bottom: 0.65rem;
}

main > section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 3px;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
  transition: width var(--transition-base);
}

main > section:hover > h2::after {
  width: 110px;
}

main > section > h3 {
  margin: 1.6rem 0 0.7rem;
  color: var(--text-primary);
}

main > section > h3:first-of-type {
  margin-top: 0.5rem;
}

main > section > h4 {
  margin: 1.2rem 0 0.5rem;
  color: var(--text-primary);
}

main > section > p {
  margin-bottom: 0.85rem;
}

main > section > p:last-child {
  margin-bottom: 0;
}

main > section > ul,
main > section > ol {
  margin: 0.5rem 0 1rem;
}

main > section > ul li,
main > section > ol li {
  padding-left: 0.15rem;
}

main > section > ul li strong,
main > section > ol li strong {
  color: var(--accent);
}

main > section > article {
  position: relative;
  margin: 1.1rem 0;
  padding: 1.25rem 1.4rem;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}

main > section > article:hover {
  transform: translateY(-4px);
  border-color: rgba(233, 69, 96, 0.3);
  box-shadow: var(--shadow-md);
  background: var(--bg-tertiary);
}

main > section > article h3 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  transition: color var(--transition-fast);
}

main > section > article:hover h3 {
  color: var(--accent);
}

main > section > article > p:first-of-type {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  margin-bottom: 0.6rem;
}

main > section > article > p {
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}

main > section > article > a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.35rem;
  padding: 0.4rem 0.95rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

main > section > article > a::after {
  content: "\2192";
  transition: transform var(--transition-fast);
}

main > section > article > a:hover {
  color: #fff;
  background: var(--gradient-accent);
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.35);
}

main > section > article > a:hover::after {
  transform: translateX(3px);
}

#hero {
  background: var(--gradient-hero);
  background-size: 200% 200%;
  animation: fadeUp var(--transition-slow) both, gradientShift 14s ease infinite;
  border: 1px solid var(--border-glass);
  overflow: hidden;
}

#hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 140%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.22), transparent 65%);
  pointer-events: none;
  animation: floatGlow 9s ease-in-out infinite alternate;
}

#hero h1 {
  position: relative;
  margin-bottom: 1.1rem;
  background: linear-gradient(120deg, var(--text-primary) 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#hero > p {
  position: relative;
  max-width: 78ch;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
}

#hero > p:last-of-type {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
}

#hero figure {
  position: relative;
  margin: 1.5rem 0 1rem;
}

#hero figure svg {
  transition: transform var(--transition-slow);
}

#hero figure:hover svg {
  transform: scale(1.015);
}

#intro ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.65rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 1.25rem;
}

#intro ul li {
  position: relative;
  padding: 0.75rem 1rem 0.75rem 2.4rem;
  margin: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

#intro ul li::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 1.15em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  box-shadow: 0 0 10px rgba(233, 69, 96, 0.6);
}

#intro ul li:hover {
  transform: translateX(4px);
  border-color: rgba(233, 69, 96, 0.3);
  background: var(--bg-tertiary);
}

#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.75rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

#products ul li {
  position: relative;
  padding: 1rem 1.1rem;
  margin: 0;
  font-size: 0.92rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#products ul li:hover {
  transform: translateY(-3px);
  border-color: rgba(233, 69, 96, 0.3);
  box-shadow: var(--shadow-md);
}

#products ul li strong {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--accent);
  font-size: 0.95rem;
}

#cases blockquote {
  animation: fadeUp var(--transition-slow) both;
}

#cases blockquote:nth-of-type(2) {
  animation-delay: 0.1s;
}

#cases blockquote:nth-of-type(3) {
  animation-delay: 0.2s;
}

#news article {
  border-left: 3px solid transparent;
}

#news article:hover {
  border-left-color: var(--accent);
}

#articles article {
  display: flex;
  flex-direction: column;
}

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

#faq details {
  margin: 0.6rem 0;
  padding: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#faq details[open] {
  border-color: rgba(233, 69, 96, 0.35);
  box-shadow: var(--shadow-sm);
  background: var(--bg-tertiary);
}

#faq details:hover {
  border-color: rgba(233, 69, 96, 0.25);
}

#faq summary {
  position: relative;
  padding: 0.9rem 2.8rem 0.9rem 1.1rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 50%;
  transition: transform var(--transition-base), background var(--transition-fast);
}

#faq details[open] summary::after {
  content: "\2212";
  transform: translateY(-50%) rotate(180deg);
  background: var(--accent);
  color: #fff;
}

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

#faq details > p {
  padding: 0 1.1rem 1rem;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  animation: fadeIn var(--transition-base) both;
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  display: grid;
  gap: 0.75rem;
}

#howto ol li {
  position: relative;
  counter-increment: step;
  padding: 0.9rem 1.1rem 0.9rem 3.4rem;
  margin: 0;
  font-size: 0.93rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(233, 69, 96, 0.35);
}

#howto ol li:hover {
  transform: translateX(4px);
  border-color: rgba(233, 69, 96, 0.3);
  background: var(--bg-tertiary);
}

#howto ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.6rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 1.25rem;
}

#howto ul li {
  position: relative;
  padding: 0.7rem 1rem 0.7rem 2.2rem;
  margin: 0;
  font-size: 0.9rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

#howto ul li::before {
  content: "\2713";
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
}

#howto ul li:hover {
  border-color: rgba(233, 69, 96, 0.3);
  transform: translateX(3px);
}

#contact ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.55rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 1.5rem;
}

#contact ul li {
  position: relative;
  padding: 0.7rem 1rem 0.7rem 2.2rem;
  margin: 0;
  font-size: 0.9rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

#contact ul li::before {
  content: "";
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(233, 69, 96, 0.6);
}

#contact ul li:hover {
  border-color: rgba(233, 69, 96, 0.3);
  background: var(--bg-tertiary);
}

#contact form {
  margin-top: 1.5rem;
}

#contact fieldset {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

#contact legend {
  padding: 0 0.6rem;
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
}

#contact label {
  display: block;
  margin: 0.9rem 0 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

#contact label:first-of-type {
  margin-top: 0;
}

#contact input[type="text"],
#contact input[type="email"],
#contact select,
#contact textarea {
  width: 100%;
  padding: 0.65rem 0.95rem;
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

#contact textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.6;
}

#contact input::placeholder,
#contact textarea::placeholder {
  color: var(--text-muted);
}

#contact input:focus,
#contact select:focus,
#contact textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: var(--bg-primary);
}

#contact select {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%),
    linear-gradient(135deg, var(--text-muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2.2rem;
}

#contact button[type="submit"] {
  margin-top: 1.3rem;
  padding: 0.75rem 2rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(233, 69, 96, 0.35);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

#contact button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(233, 69, 96, 0.5);
  filter: brightness(1.07);
}

#contact button[type="submit"]:active {
  transform: translateY(0);
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0;
}

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

#sitemap ul a,
#links ul a {
  display: block;
  padding: 0.6rem 0.95rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

#sitemap ul a:hover,
#links ul a:hover {
  color: var(--accent);
  border-color: rgba(233, 69, 96, 0.35);
  background: var(--bg-tertiary);
  transform: translateX(3px);
}

#links > p {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer[role="contentinfo"] {
  position: relative;
  margin-top: 2rem;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2.5rem) 2rem;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-glass);
  box-shadow: 0 -6px 30px rgba(0, 0, 0, 0.15);
}

footer[role="contentinfo"] > section {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--border-glass);
}

footer[role="contentinfo"] > section:last-of-type {
  border-bottom: none;
}

footer[role="contentinfo"] h2 {
  position: relative;
  margin-bottom: 0.7rem;
  padding-left: 0.85rem;
  font-size: 1rem;
  color: var(--text-primary);
}

footer[role="contentinfo"] h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 1em;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
}

footer[role="contentinfo"] p {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--text-muted);
}

footer[role="contentinfo"] > p {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-glass);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

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

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

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

@keyframes floatGlow {
  from {
    transform: translate(0, 0) scale(1);
    opacity: 0.7;
  }
  to {
    transform: translate(-30px, 20px) scale(1.1);
    opacity: 1;
  }
}

@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) {
  header[role="banner"] {
    gap: 0.6rem 1rem;
    padding: 0.65rem clamp(0.85rem, 3vw, 1.5rem);
  }

  header[role="banner"] form[role="search"] {
    flex: 1 1 100%;
    order: 3;
    margin-left: 0;
  }

  nav[aria-label="主导航"] {
    flex: 1 1 100%;
    order: 2;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

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

  nav[aria-label="主导航"] ul {
    flex-wrap: nowrap;
    gap: 0.2rem;
    padding-bottom: 0.15rem;
  }

  nav[aria-label="主导航"] a {
    white-space: nowrap;
    font-size: 0.85rem;
    padding: 0.35rem 0.65rem;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  header[role="banner"] > div > a span {
    font-size: 1.02rem;
  }

  header[role="banner"] > div > a svg {
    width: 34px;
    height: 34px;
  }

  main {
    padding: 0.85rem 0.85rem 2rem;
  }

  main > section {
    padding: 1.15rem 1rem;
    border-radius: var(--radius-md);
  }

  main > section > article {
    padding: 1rem 0.95rem;
  }

  #intro ul,
  #products ul,
  #howto ul,
  #contact ul,
  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }

  #hero > p:last-of-type {
    font-size: 0.78rem;
    line-height: 1.7;
  }

  blockquote {
    padding: 0.85rem 1rem 0.85rem 2.2rem;
  }

  blockquote::before {
    left: 0.6rem;
    font-size: 2rem;
  }

  #contact fieldset {
    padding: 1rem;
  }

  footer[role="contentinfo"] {
    padding: 1.5rem 0.85rem 1.5rem;
  }

  footer[role="contentinfo"] > p {
    font-size: 0.75rem;
    line-height: 1.8;
  }
}

@media (max-width: 400px) {
  header[role="banner"] form[role="search"] button {
    padding: 0.55rem 0.85rem;
    font-size: 0.82rem;
  }

  nav[aria-label="主导航"] a {
    font-size: 0.8rem;
  }
}

@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  a[href="#main-content"],
  #contact form {
    display: none;
  }

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

  main > section,
  main > section > article,
  blockquote {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
  }
}