:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #4a90e2;
  --accent: #ff6b9d;
  --accent-light: #ff9ec4;
  --bg: #f5f7fb;
  --bg-alt: #ffffff;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.45);
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888a8;
  --border: #e2e6f0;
  --shadow-sm: 0 2px 8px rgba(26, 115, 232, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 115, 232, 0.10);
  --shadow-lg: 0 16px 48px rgba(26, 115, 232, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-hero: linear-gradient(135deg, #1a73e8 0%, #4a90e2 35%, #7c4dff 70%, #ff6b9d 100%);
  --gradient-accent: linear-gradient(135deg, #1a73e8, #7c4dff);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(245,247,251,0.7));
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --primary: #5b9bf5;
  --primary-dark: #4a8ae0;
  --primary-light: #7cb3ff;
  --accent: #ff8fb8;
  --accent-light: #ffb0d0;
  --bg: #0f1117;
  --bg-alt: #161922;
  --bg-card: #1c2030;
  --bg-glass: rgba(28, 32, 48, 0.78);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text: #e8eaf0;
  --text-secondary: #b0b8d0;
  --text-muted: #7a82a0;
  --border: #2a3045;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --gradient-hero: linear-gradient(135deg, #0d1b3e 0%, #1a2a5e 35%, #2d1b4e 70%, #4a1a3a 100%);
  --gradient-accent: linear-gradient(135deg, #5b9bf5, #9b6bff);
  --gradient-card: linear-gradient(145deg, rgba(28,32,48,0.95), rgba(22,25,34,0.8));
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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);
  opacity: 0.85;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
}

input {
  font-family: inherit;
  font-size: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========== 滚动动画 ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(36px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(26, 115, 232, 0.3); }
  50% { box-shadow: 0 0 0 12px rgba(26, 115, 232, 0); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ========== Header ========== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.logo svg {
  border-radius: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 4px 16px rgba(26, 115, 232, 0.35);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

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

#main-nav ul {
  display: flex;
  gap: 4px;
}

#main-nav a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

#main-nav a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transition: transform var(--transition);
}

#main-nav a:hover {
  color: var(--primary);
  background: rgba(26, 115, 232, 0.06);
}

#main-nav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

.search-box input {
  width: 180px;
  padding: 8px 16px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  padding: 8px 16px;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 0 50px 50px 0;
  transition: opacity var(--transition), transform var(--transition);
}

.search-box button:hover {
  opacity: 0.9;
}

.search-box button:active {
  transform: scale(0.96);
}

#theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

#theme-toggle:hover {
  transform: rotate(20deg) scale(1.1);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  font-size: 1.4rem;
  color: var(--text);
  align-items: center;
  justify-content: center;
}

/* ========== 面包屑 ========== */
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px 0;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  color: var(--text-muted);
  opacity: 0.5;
}

.breadcrumb a {
  color: var(--text-secondary);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

/* ========== Main 通用 ========== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

main > section {
  margin: 56px 0;
  animation: fadeInUp 0.7s ease-out both;
}

main > section:nth-child(1) { animation-delay: 0.05s; }
main > section:nth-child(2) { animation-delay: 0.1s; }
main > section:nth-child(3) { animation-delay: 0.15s; }
main > section:nth-child(4) { animation-delay: 0.2s; }
main > section:nth-child(5) { animation-delay: 0.25s; }
main > section:nth-child(6) { animation-delay: 0.3s; }
main > section:nth-child(7) { animation-delay: 0.35s; }
main > section:nth-child(8) { animation-delay: 0.4s; }
main > section:nth-child(9) { animation-delay: 0.45s; }
main > section:nth-child(10) { animation-delay: 0.5s; }
main > section:nth-child(11) { animation-delay: 0.55s; }
main > section:nth-child(12) { animation-delay: 0.6s; }

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  border-radius: 3px;
  background: var(--gradient-accent);
}

h3 {
  font-size: 1.2rem;
  font-weight: 650;
  color: var(--text);
  margin: 28px 0 12px;
  letter-spacing: -0.01em;
}

h4 {
  font-size: 1rem;
  font-weight: 650;
  color: var(--text);
  margin-bottom: 12px;
}

p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.85;
}

strong {
  color: var(--primary);
  font-weight: 650;
}

/* ========== Hero ========== */
#hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 40px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-top: 28px !important;
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

#hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

#hero-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.hero-lead {
  font-size: 1.02rem;
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.85;
  margin-bottom: 16px;
}

#hero p {
  color: rgba(255, 255, 255, 0.88);
}

#hero strong {
  color: #ffe066;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  color: var(--primary-dark);
  opacity: 1;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
  color: #fff;
  opacity: 1;
}

.hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  animation: float 6s ease-in-out infinite;
}

.hero-visual svg {
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 480px;
}

/* ========== 通用卡片效果 ========== */
#brand,
#product,
#advantages,
#solution,
#cases,
#articles,
#howto,
#faq,
#knowledge,
#contact,
#sitemap {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

#brand:hover,
#product:hover,
#advantages:hover,
#solution:hover,
#cases:hover,
#articles:hover,
#howto:hover,
#faq:hover,
#knowledge:hover,
#contact:hover,
#sitemap:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 115, 232, 0.18);
}

/* ========== 品牌介绍 ========== */
#brand p {
  max-width: 900px;
}

/* ========== 产品服务 ========== */
#product h3 {
  padding-left: 14px;
  border-left: 3px solid var(--primary);
  border-radius: 2px;
}

/* ========== 产品优势 ========== */
#advantages {
  background: var(--gradient-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

#advantages h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

#advantages h3::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gradient-accent);
  flex-shrink: 0;
  box-shadow: 0 0 0 4px rgba(26, 115, 232, 0.12);
}

/* ========== 解决方案 ========== */
#solution h3 {
  background: rgba(26, 115, 232, 0.05);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

#solution h3:hover {
  background: rgba(26, 115, 232, 0.1);
  transform: translateX(4px);
}

/* ========== 客户案例 ========== */
#cases h3 {
  color: var(--primary);
  font-size: 1.08rem;
}

#cases p {
  padding-left: 16px;
  border-left: 2px solid var(--border);
  transition: border-color var(--transition);
}

#cases p:hover {
  border-left-color: var(--primary);
}

/* ========== 文章列表 ========== */
#articles article {
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#articles article::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform var(--transition);
}

#articles article:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 115, 232, 0.2);
}

#articles article:hover::before {
  transform: scaleY(1);
}

#articles article h3 {
  margin-top: 0;
  font-size: 1.08rem;
}

#articles article time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(26, 115, 232, 0.07);
  padding: 2px 10px;
  border-radius: 50px;
  margin-bottom: 8px;
}

#articles article p {
  font-size: 0.9rem;
  margin-bottom: 10px;
}

#articles article a {
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

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

/* ========== HowTo ========== */
#howto ol {
  counter-reset: howto;
  padding-left: 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 14px 16px 14px 56px;
  margin-bottom: 10px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  line-height: 1.75;
  border: 1px solid var(--border);
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 10px rgba(26, 115, 232, 0.25);
}

#howto ol li:hover {
  background: rgba(26, 115, 232, 0.05);
  transform: translateX(4px);
  border-color: rgba(26, 115, 232, 0.2);
}

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

#faq details:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(26, 115, 232, 0.2);
}

#faq details[open] {
  border-color: rgba(26, 115, 232, 0.3);
  box-shadow: var(--shadow-md);
}

#faq summary {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  cursor: pointer;
  position: relative;
  padding-right: 48px;
  list-style: none;
  transition: color var(--transition), background var(--transition);
  user-select: none;
}

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

#faq summary::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform var(--transition);
  line-height: 1;
}

#faq details[open] summary::after {
  content: '−';
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  color: var(--primary);
  background: rgba(26, 115, 232, 0.04);
}

#faq details p {
  padding: 0 20px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
  animation: fadeInUp 0.35s ease-out;
}

/* ========== 行业知识 ========== */
#knowledge h3 {
  padding-left: 16px;
  border-left: 3px solid var(--accent);
}

/* ========== 联系我们 ========== */
#contact p {
  line-height: 2;
}

#contact h3 {
  color: var(--primary);
}

/* ========== 网站地图 ========== */
#sitemap > ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 28px;
}

#sitemap > ul li a {
  display: block;
  padding: 10px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

#sitemap > ul li a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.25);
  opacity: 1;
}

#sitemap h3 {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

#sitemap h3 + ul {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

/* ========== Footer ========== */
footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  margin-top: 72px;
  transition: background var(--transition);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 52px 24px 32px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 40px;
}

.footer-brand svg {
  border-radius: 8px;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 260px;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-links h4::after,
.footer-contact h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links ul li a {
  font-size: 0.86rem;
  color: var(--text-secondary);
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

.footer-links ul li a:hover {
  color: var(--primary);
  padding-left: 6px;
  opacity: 1;
}

.footer-contact p {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.7;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 32px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  line-height: 1.7;
}

/* ========== 返回顶部 ========== */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(26, 115, 232, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: all var(--transition);
  z-index: 900;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 36px rgba(26, 115, 232, 0.45);
}

#back-to-top:active {
  transform: translateY(-2px) scale(1);
}

/* ========== 响应式 - 平板 ========== */
@media (max-width: 1024px) {
  #hero {
    grid-template-columns: 1fr;
    padding: 44px 32px;
    gap: 32px;
  }

  #hero-title {
    font-size: 1.8rem;
  }

  .hero-visual {
    order: -1;
    animation: none;
  }

  .hero-visual svg {
    max-width: 400px;
  }

  .search-box input {
    width: 130px;
  }

  #main-nav a {
    padding: 8px 10px;
    font-size: 0.84rem;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* ========== 响应式 - 手机 ========== */
@media (max-width: 768px) {
  html {
    scroll-padding-top: 68px;
  }

  .header-inner {
    padding: 0 16px;
    height: 60px;
    gap: 10px;
  }

  .logo-text {
    font-size: 1.05rem;
  }

  .logo svg {
    width: 34px;
    height: 34px;
  }

  #menu-toggle {
    display: flex;
    order: 3;
  }

  #main-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(24px) saturate(1.8);
    -webkit-backdrop-filter: blur(24px) saturate(1.8);
    border-bottom: 1px solid var(--bg-glass-border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
    box-shadow: var(--shadow-md);
    z-index: 999;
  }

  #main-nav.open {
    max-height: 420px;
    padding: 12px 0;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 0 16px;
  }

  #main-nav a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
  }

  #main-nav a::after {
    display: none;
  }

  .search-box {
    order: 2;
    margin-left: auto;
  }

  .search-box input {
    width: 100px;
    padding: 7px 12px;
    font-size: 0.8rem;
  }

  .search-box button {
    padding: 7px 12px;
    font-size: 0.8rem;
  }

  #theme-toggle {
    width: 36px;
    height: 36px;
    font-size: 1rem;
    order: 4;
  }

  .breadcrumb {
    padding: 10px 16px 0;
    font-size: 0.78rem;
  }

  main {
    padding: 0 16px;
  }

  main > section {
    margin: 36px 0;
  }

  #hero {
    padding: 32px 22px;
    border-radius: var(--radius-lg);
    margin-top: 20px !important;
  }

  #hero-title {
    font-size: 1.45rem;
    line-height: 1.35;
  }

  .hero-lead {
    font-size: 0.92rem;
  }

  #hero p {
    font-size: 0.88rem;
  }

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .hero-visual svg {
    max-width: 320px;
  }

  h2 {
    font-size: 1.35rem;
    margin-bottom: 18px;
    padding-left: 14px;
  }

  h3 {
    font-size: 1.05rem;
    margin: 22px 0 10px;
  }

  p {
    font-size: 0.9rem;
  }

  #brand,
  #product,
  #advantages,
  #solution,
  #cases,
  #articles,
  #howto,
  #faq,
  #knowledge,
  #contact,
  #sitemap {
    padding: 26px 20px;
    border-radius: var(--radius-md);
  }

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

  #articles article:hover {
    transform: translateY(-3px);
  }

  #howto ol li {
    padding: 12px 14px 12px 48px;
    font-size: 0.88rem;
  }

  #howto ol li::before {
    width: 24px;
    height: 24px;
    left: 12px;
    font-size: 0.75rem;
  }

  #faq summary {
    padding: 14px 16px;
    padding-right: 42px;
    font-size: 0.9rem;
  }

  #faq summary::after {
    right: 16px;
  }

  #faq details p {
    padding: 0 16px 16px;
    font-size: 0.86rem;
  }

  #sitemap > ul {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  #sitemap > ul li a {
    padding: 9px 12px;
    font-size: 0.84rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 16px 24px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .footer-bottom {
    padding: 16px 16px 28px;
  }

  .footer-bottom p {
    font-size: 0.72rem;
  }

  #back-to-top {
    width: 42px;
    height: 42px;
    bottom: 20px;
    right: 20px;
    font-size: 1.05rem;
  }
}

/* ========== 响应式 - 小手机 ========== */
@media (max-width: 400px) {
  .logo-text {
    font-size: 0.95rem;
  }

  .search-box input {
    width: 80px;
  }

  #hero-title {
    font-size: 1.25rem;
  }

  #hero {
    padding: 26px 18px;
  }

  h2 {
    font-size: 1.2rem;
  }

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

/* ========== 无障碍与动效偏好 ========== */
@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;
  }
}

/* ========== 打印样式 ========== */
@media print {
  #site-header,
  #back-to-top,
  .hero-actions,
  #menu-toggle,
  #theme-toggle,
  .search-box {
    display: none !important;
  }

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

  #hero {
    background: #f0f0f0 !important;
    box-shadow: none;
  }

  #hero-title,
  .hero-lead,
  #hero p {
    color: #000 !important;
  }

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ========== 选中文本 ========== */
::selection {
  background: rgba(26, 115, 232, 0.22);
  color: var(--text);
}

/* ========== 焦点可见 ========== */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}