:root {
  --bg-primary: #f5f6fa;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a68;
  --text-muted: #7a7a95;
  --accent: #e94560;
  --accent-hover: #d63850;
  --accent-soft: rgba(233, 69, 96, 0.12);
  --border: rgba(26, 26, 46, 0.08);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 28px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #e94560 140%);
  --gradient-accent: linear-gradient(135deg, #e94560 0%, #ff6b81 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  --max-width: 1200px;
}

[data-theme="dark"] {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(30, 30, 52, 0.72);
  --bg-glass: rgba(30, 30, 52, 0.55);
  --text-primary: #eaeaf2;
  --text-secondary: #b0b0c8;
  --text-muted: #8080a0;
  --accent: #ff6b81;
  --accent-hover: #ff8598;
  --accent-soft: rgba(255, 107, 129, 0.15);
  --border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
  --gradient-hero: linear-gradient(135deg, #0a0a14 0%, #1a1a2e 40%, #2a1a3e 70%, #ff6b81 140%);
  --gradient-card: linear-gradient(145deg, rgba(30,30,52,0.9), rgba(30,30,52,0.6));
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

ul, ol {
  list-style: none;
}

/* ===== Header ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--text-primary);
}

.logo svg {
  border-radius: 8px;
  transition: transform var(--transition-smooth);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.08);
}

#main-nav {
  flex: 1;
  min-width: 0;
}

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

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

#main-nav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-smooth);
}

#main-nav a:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

#main-nav a:hover::after {
  width: 60%;
}

#menu-toggle,
#theme-toggle {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 18px;
  cursor: pointer;
  color: var(--text-primary);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

#theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

#menu-toggle:hover,
#theme-toggle:hover {
  transform: scale(1.08);
  background: var(--accent-soft);
}

#site-search {
  display: flex;
  gap: 0;
  flex-shrink: 0;
}

#site-search input {
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  width: 180px;
  transition: width var(--transition-smooth), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#site-search input:focus {
  width: 220px;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#site-search input::placeholder {
  color: var(--text-muted);
}

#site-search button {
  padding: 9px 18px;
  border: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

#site-search button:hover {
  opacity: 0.9;
  transform: translateX(1px);
}

/* ===== Breadcrumb ===== */
nav[aria-label="面包屑导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px 0;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-muted);
}

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

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

/* ===== Main ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 60px;
}

section {
  margin-top: 48px;
  scroll-margin-top: 90px;
}

section h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  position: relative;
  padding-left: 18px;
  line-height: 1.3;
}

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

section h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 22px 0 10px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

section p {
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-size: 15.5px;
}

/* ===== Hero ===== */
#hero {
  margin-top: 24px;
  padding: 64px 48px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.35) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(15, 52, 96, 0.5) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-20px, 20px) scale(1.08); }
}

#hero h1 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
  animation: fadeUp 0.8s ease both;
}

#hero p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
  max-width: 720px;
  position: relative;
  z-index: 1;
  animation: fadeUp 0.8s 0.15s ease both;
}

#hero a {
  display: inline-block;
  margin-top: 18px;
  margin-right: 12px;
  padding: 13px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 15px;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  animation: fadeUp 0.8s 0.3s ease both;
}

#hero a:first-of-type {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.4);
}

#hero a:first-of-type:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(233, 69, 96, 0.55);
  color: #fff;
}

#hero a:last-of-type {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

#hero a:last-of-type:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-3px);
  color: #fff;
}

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

/* ===== Brand ===== */
#brand {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth);
}

#brand:hover {
  box-shadow: var(--shadow-md);
}

#brand h3 {
  color: var(--accent);
  font-size: 17px;
}

/* ===== Products ===== */
#products {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#products ul {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

#products li {
  padding: 16px 20px 16px 48px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 15px;
  position: relative;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#products li::before {
  content: "✓";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

#products li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

/* ===== Solutions ===== */
#solutions {
  display: grid;
  gap: 20px;
}

#solutions h2 {
  grid-column: 1 / -1;
}

#solutions h3 {
  margin-top: 0;
}

#solutions p {
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  height: 100%;
}

#solutions p:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ===== Cases ===== */
#cases {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#cases h3 {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  margin-top: 24px;
  font-size: 17px;
}

#cases h3:first-of-type {
  margin-top: 16px;
}

#cases blockquote {
  margin-top: 16px;
  display: grid;
  gap: 14px;
}

#cases blockquote p {
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  font-style: italic;
  position: relative;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

#cases blockquote p::before {
  content: "\201C";
  position: absolute;
  top: 8px;
  left: 10px;
  font-size: 40px;
  line-height: 1;
  color: var(--accent);
  opacity: 0.3;
  font-family: Georgia, serif;
}

#cases blockquote p:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ===== News ===== */
#news {
  display: grid;
  gap: 18px;
}

#news h2 {
  grid-column: 1 / -1;
}

#news article {
  padding: 26px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

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

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

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

#news article h3 {
  margin-top: 0;
  font-size: 18px;
}

#news time {
  display: inline-block;
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 8px;
  padding: 3px 12px;
  border-radius: 50px;
  background: var(--accent-soft);
}

/* ===== Articles ===== */
#articles {
  display: grid;
  gap: 18px;
}

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

#articles article {
  padding: 26px 28px;
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

#articles article h3 {
  margin-top: 0;
  font-size: 18px;
  line-height: 1.4;
}

#articles article time {
  display: inline-block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

#articles article p {
  flex: 1;
  font-size: 14.5px;
  line-height: 1.7;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-weight: 600;
  font-size: 14px;
  color: var(--accent);
  align-self: flex-start;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

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

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

/* ===== FAQ ===== */
#faq {
  display: grid;
  gap: 12px;
}

#faq h2 {
  grid-column: 1 / -1;
}

#faq details {
  border-radius: var(--radius-md);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

#faq details:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

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

#faq summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 15.5px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-primary);
  transition: color var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 300;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform var(--transition-smooth);
  line-height: 1;
}

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

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

#faq details p {
  padding: 0 24px 20px;
  font-size: 14.5px;
  line-height: 1.8;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== HowTo ===== */
#howto {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#howto ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

#howto ol li {
  counter-increment: step;
  padding: 16px 20px 16px 60px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 15px;
  position: relative;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

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

#howto ul {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

#howto ul li {
  padding: 12px 18px 12px 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14.5px;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

#howto ul li::before {
  content: "•";
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
}

#howto ul li:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}

/* ===== Contact ===== */
#contact {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#contact ul {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

#contact ul li {
  padding: 14px 20px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 15px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#contact ul li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

#contact h3 {
  margin-top: 28px;
  color: var(--accent);
  font-size: 17px;
}

/* ===== Sitemap & Links ===== */
#sitemap {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  margin-top: 16px;
}

#sitemap a {
  display: block;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14.5px;
  font-weight: 500;
  text-align: center;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

#sitemap a:hover {
  transform: translateY(-3px);
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

#links {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#links ul {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

#links a {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 50px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

#links a:hover {
  transform: translateY(-3px);
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
}

/* ===== Legal ===== */
#legal {
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#legal h2 {
  font-size: 20px;
  margin-top: 24px;
}

#legal h2:first-child {
  margin-top: 0;
}

/* ===== Updates ===== */
#updates {
  padding: 32px 40px;
  border-radius: var(--radius-lg);
  background: var(--accent-soft);
  border: 1px solid var(--border);
  text-align: center;
}

#updates h2 {
  padding-left: 0;
  text-align: center;
}

#updates h2::before {
  display: none;
}

#updates p {
  display: inline-block;
  margin: 4px 12px;
  font-size: 14px;
  color: var(--text-muted);
}

/* ===== Footer ===== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  text-align: center;
  transition: background var(--transition-smooth);
}

footer p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 8px;
  line-height: 1.8;
}

footer p:first-child {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ===== Back to Top ===== */
#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  padding: 12px 20px;
  border: none;
  border-radius: 50px;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth), visibility var(--transition-smooth), box-shadow var(--transition-fast);
}

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

#back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(233, 69, 96, 0.55);
}

/* ===== Scroll Animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
  #solutions {
    grid-template-columns: repeat(2, 1fr);
  }

  #news {
    grid-template-columns: repeat(2, 1fr);
  }

  #articles {
    grid-template-columns: repeat(2, 1fr);
  }

  #faq {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  #solutions {
    grid-template-columns: repeat(3, 1fr);
  }

  #news {
    grid-template-columns: repeat(3, 1fr);
  }

  #articles {
    grid-template-columns: repeat(3, 1fr);
  }

  #faq {
    grid-template-columns: repeat(2, 1fr);
  }

  #hero {
    padding: 80px 64px;
  }

  #hero h1 {
    font-size: 46px;
  }
}

@media (max-width: 1023px) {
  #menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  #main-nav {
    display: none;
    width: 100%;
    order: 10;
  }

  #main-nav.open {
    display: block;
    animation: slideDown 0.3s ease;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 8px 0;
  }

  #main-nav a {
    display: block;
    padding: 12px 16px;
  }

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

  #site-search {
    order: 11;
    width: 100%;
  }

  #site-search input {
    flex: 1;
    width: auto;
  }

  #site-search input:focus {
    width: auto;
  }

  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
}

@media (max-width: 767px) {
  body {
    font-size: 15px;
  }

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

  .logo {
    font-size: 17px;
  }

  .logo svg {
    width: 30px;
    height: 30px;
  }

  nav[aria-label="面包屑导航"] {
    padding: 12px 16px 0;
  }

  main {
    padding: 0 16px 40px;
  }

  section {
    margin-top: 32px;
  }

  section h2 {
    font-size: 22px;
    padding-left: 14px;
  }

  section h3 {
    font-size: 17px;
  }

  #hero {
    padding: 40px 24px;
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    font-size: 26px;
  }

  #hero p {
    font-size: 14.5px;
  }

  #hero a {
    display: block;
    text-align: center;
    margin-right: 0;
    margin-bottom: 10px;
    padding: 12px 24px;
  }

  #brand,
  #products,
  #cases,
  #howto,
  #contact,
  #sitemap,
  #links,
  #legal {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  #cases h3 {
    padding: 12px 16px;
    font-size: 16px;
  }

  #news article,
  #articles article {
    padding: 20px;
    border-radius: var(--radius-md);
  }

  #faq summary {
    padding: 14px 18px;
    font-size: 14.5px;
  }

  #faq details p {
    padding: 0 18px 16px;
    font-size: 14px;
  }

  #howto ol li {
    padding: 14px 16px 14px 52px;
    font-size: 14px;
  }

  #howto ol li::before {
    left: 14px;
    width: 24px;
    height: 24px;
    font-size: 12px;
  }

  #howto ul li {
    padding: 10px 14px 10px 36px;
    font-size: 14px;
  }

  #howto ul li::before {
    left: 16px;
  }

  #contact ul li {
    padding: 12px 16px;
    font-size: 14px;
  }

  #sitemap ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  #sitemap a {
    padding: 10px 12px;
    font-size: 13.5px;
  }

  #links ul {
    flex-direction: column;
  }

  #links a {
    text-align: center;
  }

  #updates {
    padding: 24px 20px;
  }

  #updates p {
    display: block;
    margin: 6px 0;
  }

  footer {
    padding: 28px 16px;
  }

  footer p {
    font-size: 13px;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    padding: 10px 16px;
    font-size: 13px;
  }
}

@media (max-width: 400px) {
  #hero h1 {
    font-size: 22px;
  }

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

/* ===== Accessibility ===== */
@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;
  }
}

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 5px;
  border: 2px solid var(--bg-primary);
}

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