:root {
  --primary: #ff4d6d;
  --primary-dark: #e6395a;
  --primary-light: #ff7a94;
  --secondary: #6c5ce7;
  --accent: #00cec9;
  --bg: #f5f6fa;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.45);
  --text: #1a1a2e;
  --text-secondary: #5a5a72;
  --text-muted: #8a8aa0;
  --border: #e4e6ef;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow: 0 8px 30px rgba(26, 26, 46, 0.10);
  --shadow-lg: 0 20px 60px rgba(26, 26, 46, 0.16);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --radius-full: 999px;
  --gradient-primary: linear-gradient(135deg, #ff4d6d 0%, #6c5ce7 100%);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #6c5ce7 100%);
  --gradient-accent: linear-gradient(135deg, #00cec9 0%, #6c5ce7 100%);
  --gradient-warm: linear-gradient(135deg, #ff4d6d 0%, #ff9a3d 100%);
  --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-slow: 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
  --header-height: 72px;
  --max-width: 1240px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="dark"],
body.dark-mode {
  --bg: #0d0d1a;
  --bg-card: #16162a;
  --bg-glass: rgba(22, 22, 42, 0.78);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text: #eaeaf0;
  --text-secondary: #b0b0c8;
  --text-muted: #787890;
  --border: #2a2a45;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
  --gradient-hero: linear-gradient(135deg, #0d0d1a 0%, #1a1a2e 40%, #16213e 70%, #2d1b69 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d0d1a;
    --bg-card: #16162a;
    --bg-glass: rgba(22, 22, 42, 0.78);
    --bg-glass-border: rgba(255, 255, 255, 0.08);
    --text: #eaeaf0;
    --text-secondary: #b0b0c8;
    --text-muted: #787890;
    --border: #2a2a45;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
    --gradient-hero: linear-gradient(135deg, #0d0d1a 0%, #1a1a2e 40%, #16213e 70%, #2d1b69 100%);
  }
}

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

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 0% 0%, rgba(255, 77, 109, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 100% 20%, rgba(108, 92, 231, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(0, 206, 201, 0.05) 0%, transparent 45%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

body.no-scroll {
  overflow: hidden;
}

img,
svg,
video {
  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);
}

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

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

li {
  margin-bottom: 0.4em;
}

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

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.4rem); }
h4 { font-size: 1.05rem; }

p {
  margin-bottom: 1em;
  color: var(--text-secondary);
}

blockquote {
  position: relative;
  margin: 1.2em 0;
  padding: 1.2em 1.4em 1.2em 1.8em;
  background: var(--bg-glass);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--bg-glass-border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow);
}

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

blockquote p::before {
  content: "\201C";
  font-size: 1.6em;
  color: var(--primary);
  line-height: 0;
  vertical-align: -0.35em;
  margin-right: 2px;
}

blockquote p::after {
  content: "\201D";
  font-size: 1.6em;
  color: var(--primary);
  line-height: 0;
  vertical-align: -0.35em;
  margin-left: 2px;
}

address {
  font-style: normal;
}

/* ===== 跳转链接 ===== */
body > a[href="#main-content"] {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-weight: 600;
  box-shadow: var(--shadow);
  transition: top var(--transition);
}

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

/* ===== 头部 ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: var(--header-height);
  padding: 0 clamp(16px, 3vw, 40px);
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02), var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header > div:first-child {
  flex-shrink: 0;
}

#site-header > div:first-child > a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

#site-header > div:first-child > a svg {
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(255, 77, 109, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
}

#site-header > div:first-child > a:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 8px 20px rgba(255, 77, 109, 0.5);
}

#site-header > div:first-child > a span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#site-header nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

#site-header nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  padding: 0;
  margin: 0;
}

#site-header nav ul li {
  margin: 0;
}

#site-header nav ul li a {
  position: relative;
  display: block;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition), background var(--transition);
}

#site-header nav ul li a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

#site-header nav ul li a:hover {
  color: var(--primary);
  background: rgba(255, 77, 109, 0.08);
}

#site-header nav ul li a:hover::after {
  width: 60%;
}

#site-header > div:last-child {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

#site-header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}

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

#site-header form[role="search"] input[type="search"] {
  width: 180px;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: width var(--transition), border-color var(--transition), box-shadow var(--transition);
}

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

#site-header form[role="search"] input[type="search"]:focus {
  width: 240px;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(255, 77, 109, 0.12);
  outline: none;
}

#site-header form[role="search"] button[type="submit"] {
  padding: 9px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(255, 77, 109, 0.3);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#site-header form[role="search"] button[type="submit"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(255, 77, 109, 0.45);
  filter: brightness(1.05);
}

#site-header form[role="search"] button[type="submit"]:active {
  transform: translateY(0);
}

#dark-mode-toggle,
#mobile-menu-toggle {
  padding: 9px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition), background var(--transition), transform var(--transition);
}

#dark-mode-toggle:hover,
#mobile-menu-toggle:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
}

#mobile-menu-toggle {
  display: none;
}

/* ===== 面包屑 ===== */
body > nav[aria-label="面包屑导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px clamp(16px, 3vw, 40px) 0;
}

body > nav[aria-label="面包屑导航"] ol {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

body > nav[aria-label="面包屑导航"] ol li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

body > nav[aria-label="面包屑导航"] ol li + li::before {
  content: "/";
  color: var(--text-muted);
  opacity: 0.5;
}

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

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

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

/* ===== 主内容 ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 40px) 60px;
}

main > section {
  margin-top: clamp(40px, 6vw, 72px);
  animation: fadeUp 0.7s cubic-bezier(0.25, 0.8, 0.25, 1) both;
}

main > section:nth-child(2) { animation-delay: 0.05s; }
main > section:nth-child(3) { animation-delay: 0.1s; }
main > section:nth-child(4) { animation-delay: 0.15s; }
main > section:nth-child(5) { animation-delay: 0.2s; }
main > section:nth-child(6) { animation-delay: 0.25s; }
main > section:nth-child(7) { animation-delay: 0.3s; }

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

main > section > h2 {
  position: relative;
  display: inline-block;
  margin-bottom: 1.2em;
  padding-bottom: 0.4em;
}

main > section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 4px;
  transition: width var(--transition-slow);
}

main > section:hover > h2::after {
  width: 100%;
}

main > section > h3 {
  margin-top: 1.6em;
  margin-bottom: 0.6em;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  color: var(--text);
}

/* ===== Hero ===== */
#hero {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(32px, 5vw, 64px) clamp(24px, 4vw, 56px);
  background: var(--gradient-hero);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  color: #fff;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 10%, rgba(255, 77, 109, 0.35) 0%, transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(0, 206, 201, 0.25) 0%, transparent 45%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent);
  transform: rotate(20deg);
  animation: heroShine 6s ease-in-out infinite;
  pointer-events: none;
}

@keyframes heroShine {
  0%, 100% { opacity: 0.3; transform: rotate(20deg) translateX(0); }
  50% { opacity: 0.7; transform: rotate(20deg) translateX(-30%); }
}

#hero h1 {
  position: relative;
  z-index: 1;
  color: #fff;
  margin-bottom: 0.6em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}

#hero > p {
  position: relative;
  z-index: 1;
  max-width: 820px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.02rem;
}

#hero > div {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 1.6em 0;
}

#hero > div a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

#hero > div a:first-child {
  color: #fff;
  background: var(--gradient-primary);
  box-shadow: 0 8px 24px rgba(255, 77, 109, 0.45);
}

#hero > div a:first-child:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 34px rgba(255, 77, 109, 0.6);
  color: #fff;
}

#hero > div a:last-child {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

#hero > div a:last-child:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-3px) scale(1.02);
  color: #fff;
}

#hero figure {
  position: relative;
  z-index: 1;
  margin-top: 1.6em;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

#hero figure:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.55);
}

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

#hero figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 20px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.9);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* ===== 卡片通用 ===== */
#brand,
#products,
#solutions,
#cases,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#links {
  padding: clamp(28px, 4vw, 48px);
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
}

#brand:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#knowledge:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#links:hover {
  box-shadow: var(--shadow-lg);
}

/* ===== 产品优势列表 ===== */
#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  list-style: none;
  padding: 0;
  margin-top: 1.4em;
}

#products ul li {
  position: relative;
  margin: 0;
  padding: 18px 20px 18px 52px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#products ul li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  width: 20px;
  height: 20px;
  transform: translateY(-50%);
  background: var(--gradient-primary);
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(255, 77, 109, 0.35);
}

#products ul li::after {
  content: "";
  position: absolute;
  left: 24px;
  top: 50%;
  width: 8px;
  height: 4px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: translateY(-70%) rotate(-45deg);
}

#products ul li:hover {
  transform: translateY(-4px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
}

/* ===== 客户案例 ===== */
#cases blockquote {
  margin: 1em 0;
}

/* ===== 新闻 & 文章 ===== */
#news article,
#articles article {
  position: relative;
  margin-bottom: 1.4em;
  padding: 22px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news article:last-child,
#articles article:last-child {
  margin-bottom: 0;
}

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

#news article h3,
#articles article h3 {
  margin-top: 0;
  margin-bottom: 0.4em;
  padding-left: 0;
  border-left: none;
  font-size: 1.15rem;
  color: var(--text);
  transition: color var(--transition);
}

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

#news article > p:first-of-type,
#articles article > p:first-of-type {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.7em;
}

#articles article > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 0.6em;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition), color var(--transition);
}

#articles article > a::after {
  content: "\2192";
  transition: transform var(--transition);
}

#articles article > a:hover {
  gap: 10px;
  color: var(--primary-dark);
}

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

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

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

#faq details:last-of-type {
  margin-bottom: 0;
}

#faq summary {
  position: relative;
  padding: 18px 52px 18px 22px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition), color var(--transition);
}

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

#faq summary::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--transition);
}

#faq details[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

#faq summary:hover {
  background: rgba(255, 77, 109, 0.06);
  color: var(--primary);
}

#faq details > p {
  padding: 0 22px 20px;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--text-secondary);
  animation: fadeUp 0.4s ease both;
}

/* ===== HowTo ===== */
#howto ol {
  display: grid;
  gap: 16px;
  list-style: none;
  padding: 0;
  margin: 1.4em 0;
  counter-reset: step;
}

#howto ol > li {
  position: relative;
  margin: 0;
  padding: 22px 24px 22px 74px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  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: 22px;
  top: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-primary);
  border-radius: 50%;
  box-shadow: 0 6px 16px rgba(255, 77, 109, 0.35);
}

#howto ol > li:hover {
  transform: translateX(6px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
}

#howto ol > li h4 {
  margin-bottom: 0.4em;
  color: var(--text);
}

#howto ol > li p {
  margin: 0;
  font-size: 0.94rem;
}

#howto ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 1em 0;
}

#howto ul li {
  position: relative;
  margin: 0;
  padding: 12px 16px 12px 38px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto ul li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  transform: translateY(-50%) rotate(45deg);
  background: var(--gradient-accent);
  border-radius: 2px;
}

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

#howto > p:last-of-type {
  margin-top: 1.4em;
  padding: 18px 22px;
  background: linear-gradient(135deg, rgba(255, 77, 109, 0.08), rgba(108, 92, 231, 0.08));
  border-radius: var(--radius);
  border: 1px dashed var(--primary-light);
  color: var(--text-secondary);
}

/* ===== 联系 ===== */
#contact address {
  display: grid;
  gap: 6px;
  padding: 24px;
  margin: 1.2em 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

#contact address:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
}

#contact address h3 {
  margin-top: 0;
  padding-left: 0;
  border-left: none;
}

#contact address p {
  margin: 0;
  font-size: 0.94rem;
}

#contact address a {
  font-weight: 600;
  word-break: break-all;
}

/* ===== 网站地图 & 友情链接 ===== */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 1.2em 0 0;
}

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

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 12px 18px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  transform: translateY(-3px);
  color: #fff;
  background: var(--gradient-primary);
  border-color: transparent;
  box-shadow: 0 8px 20px rgba(255, 77, 109, 0.35);
}

/* ===== 页脚 ===== */
footer {
  margin-top: 60px;
  padding: clamp(36px, 5vw, 64px) clamp(16px, 3vw, 40px) 40px;
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.82);
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 77, 109, 0.25) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(0, 206, 201, 0.18) 0%, transparent 40%);
  pointer-events: none;
}

footer > section {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

footer > section:last-child {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

footer h2 {
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 0.6em;
  display: flex;
  align-items: center;
  gap: 10px;
}

footer h2::before {
  content: "";
  width: 4px;
  height: 18px;
  background: var(--gradient-warm);
  border-radius: 4px;
}

footer p {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 0.4em;
  max-width: 900px;
}

footer a {
  color: var(--primary-light);
}

footer a:hover {
  color: #fff;
}

/* ===== 返回顶部 ===== */
#back-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  padding: 0;
  font-size: 0;
  color: #fff;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(255, 77, 109, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.85);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
}

#back-to-top::before {
  content: "";
  width: 12px;
  height: 12px;
  border-top: 2.5px solid #fff;
  border-left: 2.5px solid #fff;
  transform: rotate(45deg) translate(2px, 2px);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-5px) scale(1.06);
  box-shadow: 0 16px 40px rgba(255, 77, 109, 0.6);
}

/* ===== 滚动显现动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.7s cubic-bezier(0.25, 0.8, 0.25, 1);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
  #site-header nav ul li a {
    padding: 8px 10px;
    font-size: 0.86rem;
  }
  #site-header form[role="search"] input[type="search"] {
    width: 140px;
  }
  #site-header form[role="search"] input[type="search"]:focus {
    width: 180px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 64px;
  }

  #site-header {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-height);
    padding: 12px clamp(16px, 3vw, 24px);
    gap: 10px;
  }

  #site-header nav {
    order: 3;
    flex-basis: 100%;
    display: none;
    justify-content: flex-start;
    padding: 8px 0 4px;
    border-top: 1px solid var(--bg-glass-border);
    animation: fadeUp 0.3s ease both;
  }

  #site-header nav.open {
    display: flex;
  }

  #site-header nav ul {
    flex-wrap: wrap;
    gap: 4px;
  }

  #site-header nav ul li a {
    padding: 8px 12px;
    font-size: 0.88rem;
  }

  #mobile-menu-toggle {
    display: inline-flex;
  }

  #site-header form[role="search"] {
    display: none;
  }

  #hero {
    padding: clamp(28px, 6vw, 40px) clamp(20px, 5vw, 32px);
  }

  #hero > div a {
    flex: 1 1 auto;
    padding: 12px 22px;
  }
}

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

  #site-header > div:first-child > a span {
    font-size: 1rem;
  }

  #dark-mode-toggle,
  #mobile-menu-toggle {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  main {
    padding: 0 16px 40px;
  }

  main > section {
    margin-top: 36px;
  }

  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links {
    padding: 22px 18px;
    border-radius: var(--radius);
  }

  #hero {
    border-radius: var(--radius);
    padding: 28px 20px;
  }

  #hero > div {
    flex-direction: column;
  }

  #hero > div a {
    width: 100%;
  }

  #products ul {
    grid-template-columns: 1fr;
  }

  #howto ol > li {
    padding: 20px 18px 20px 64px;
  }

  #howto ol > li::before {
    left: 18px;
    top: 20px;
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }

  #howto ul {
    grid-template-columns: 1fr;
  }

  #faq summary {
    padding: 16px 46px 16px 18px;
    font-size: 0.92rem;
  }

  #faq details > p {
    padding: 0 18px 18px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  #back-to-top {
    width: 46px;
    height: 46px;
  }
}

@media (max-width: 400px) {
  #site-header > div:first-child > a span {
    display: none;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }
}

/* ===== 减少动画偏好 ===== */
@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;
  }

  main > section {
    opacity: 1;
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ===== 打印 ===== */
@media print {
  #site-header,
  #back-to-top,
  #mobile-menu-toggle,
  #dark-mode-toggle,
  body > a[href="#main-content"] {
    display: none !important;
  }

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

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

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: 10px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--primary-dark), var(--secondary));
}

::selection {
  background: rgba(255, 77, 109, 0.25);
  color: var(--text);
}