:root {
  --primary: #6C5CE7;
  --primary-light: #8B7CF6;
  --primary-dark: #5546C8;
  --accent: #FD79A8;
  --accent-light: #FF9EC4;
  --secondary: #00CEC9;
  --bg: #F7F8FC;
  --bg-elevated: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.65);
  --bg-glass-strong: rgba(255, 255, 255, 0.85);
  --text: #1A1A2E;
  --text-secondary: #4A4A6A;
  --text-muted: #8A8AA8;
  --border: rgba(108, 92, 231, 0.12);
  --border-strong: rgba(108, 92, 231, 0.25);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.08);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.12);
  --shadow-glow: 0 8px 32px rgba(108, 92, 231, 0.25);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
}

[data-theme="dark"] {
  --bg: #0F0F1A;
  --bg-elevated: #1A1A2E;
  --bg-glass: rgba(26, 26, 46, 0.65);
  --bg-glass-strong: rgba(26, 26, 46, 0.9);
  --text: #F0F0F8;
  --text-secondary: #B0B0CC;
  --text-muted: #6A6A88;
  --border: rgba(139, 124, 246, 0.15);
  --border-strong: rgba(139, 124, 246, 0.3);
  --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);
  --shadow-glow: 0 8px 32px rgba(108, 92, 231, 0.4);
}

*,
*::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%;
}

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

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

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

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

ul,
ol {
  list-style: none;
}

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);
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.6rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.05rem;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

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

/* ===== 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), box-shadow var(--transition);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  font-size: 1.15rem;
}

.brand svg {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition);
}

.brand a:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

.brand-name {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

nav[aria-label="主导航"] {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-list a:hover {
  color: var(--primary);
  background: rgba(108, 92, 231, 0.08);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

#site-search {
  display: flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

#site-search input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--text);
  width: 160px;
  font-family: inherit;
}

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

#site-search button {
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition);
}

#site-search button:hover {
  opacity: 0.9;
}

#theme-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text);
}

#theme-toggle:hover,
#menu-toggle:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
}

/* ===== Hero ===== */
#hero {
  position: relative;
  padding: 80px 24px 100px;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(108, 92, 231, 0.18), transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(253, 121, 168, 0.16), transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(0, 206, 201, 0.08), transparent 60%),
    linear-gradient(135deg, var(--bg) 0%, rgba(108, 92, 231, 0.05) 50%, var(--bg) 100%);
}

#hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -120px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  filter: blur(100px);
  opacity: 0.25;
  animation: floatBlob 12s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -140px;
  left: -100px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  filter: blur(100px);
  opacity: 0.2;
  animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

#hero-title {
  max-width: 900px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--primary) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeUp 0.8s ease both;
}

.hero-lead {
  max-width: 760px;
  margin: 0 auto 2rem;
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  color: var(--text-secondary);
  animation: fadeUp 0.8s ease 0.1s both;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  animation: fadeUp 0.8s ease 0.2s both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  opacity: 0;
  transition: opacity var(--transition);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(108, 92, 231, 0.4);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span,
.btn-primary {
  position: relative;
  z-index: 1;
}

.btn-secondary {
  background: var(--bg-glass-strong);
  color: var(--primary);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  color: var(--primary-dark);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
  animation: fadeUp 0.8s ease 0.3s both;
}

.stat {
  padding: 24px 16px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

.stat-num {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

/* ===== Breadcrumb ===== */
#breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

#breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--text-muted);
}

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

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

#breadcrumb [aria-current="page"] {
  color: var(--text-muted);
}

/* ===== Sections ===== */
main > section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px;
}

main > section:not(#hero):not(#breadcrumb) {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

main > section.visible:not(#hero):not(#breadcrumb) {
  opacity: 1;
  transform: translateY(0);
}

#hero,
#breadcrumb {
  max-width: none;
}

/* ===== Intro ===== */
#intro {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-top: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

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

/* ===== Products ===== */
#products {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

#products h3 {
  position: relative;
  padding-left: 16px;
}

#products h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 70%;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
}

#products > p:first-of-type {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

#products h4 {
  color: var(--accent);
}

/* ===== Solutions ===== */
#solutions {
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.06), rgba(253, 121, 168, 0.04));
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  border: 1px solid var(--border);
}

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

/* ===== Applications ===== */
#applications {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

/* ===== Cases ===== */
#cases {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

#cases h3 {
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.08), rgba(253, 121, 168, 0.06));
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  margin-top: 1.25rem;
}

#cases h3 + p {
  padding: 0 4px;
}

#cases h3:last-of-type + p {
  background: var(--bg-glass);
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-strong);
  line-height: 2;
  color: var(--text-secondary);
}

/* ===== News ===== */
#news {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.news-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.news-list li {
  padding: 24px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

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

.news-list li:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

.news-list li:hover::before {
  transform: scaleX(1);
}

.news-list h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.news-list h3 a {
  color: var(--text);
}

.news-list h3 a:hover {
  color: var(--primary);
}

.news-list time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 2px 10px;
  background: rgba(108, 92, 231, 0.08);
  border-radius: 999px;
}

.news-list p {
  font-size: 0.9rem;
  margin-bottom: 0;
  color: var(--text-secondary);
}

/* ===== Articles ===== */
#articles {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

#articles > p:first-of-type {
  margin-bottom: 24px;
}

#articles article {
  padding: 28px;
  margin-bottom: 20px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

#articles article h3 {
  margin-top: 0;
  color: var(--primary);
}

#articles article .meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border);
}

#articles article p:not(.meta) {
  font-size: 0.95rem;
}

#articles article > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 8px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  margin-top: 8px;
  transition: all var(--transition);
}

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

#articles article > a:hover {
  color: #fff;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

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

/* ===== Knowledge ===== */
#knowledge {
  background: linear-gradient(135deg, rgba(0, 206, 201, 0.06), rgba(108, 92, 231, 0.06));
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  border: 1px solid var(--border);
}

/* ===== FAQ ===== */
#faq {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

#faq details {
  margin-bottom: 12px;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

#faq details:hover {
  border-color: var(--border-strong);
}

#faq summary {
  padding: 18px 48px 18px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  position: relative;
  color: var(--text);
  list-style: none;
  transition: color var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition);
}

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

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

#faq details p {
  padding: 0 20px 20px;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  animation: fadeUp 0.3s ease;
}

/* ===== HowTo ===== */
#howto {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

#howto h3 {
  color: var(--primary);
  padding-left: 16px;
  position: relative;
}

#howto h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 70%;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
}

#howto h3 + p {
  background: var(--bg-glass);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  font-size: 0.95rem;
}

/* ===== Contact ===== */
#contact {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.contact-list li {
  padding: 16px 20px;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.contact-list li:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* ===== Sitemap & Links ===== */
#sitemap,
#links {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.sitemap-list,
.links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.sitemap-list a,
.links-list a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.88rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.sitemap-list a:hover,
.links-list a:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ===== Legal ===== */
#legal {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

#legal h3 {
  color: var(--text);
  font-size: 1.05rem;
}

#legal h3::before {
  content: "§ ";
  color: var(--primary);
}

#legal p {
  font-size: 0.9rem;
}

/* ===== Footer ===== */
#site-footer {
  background: linear-gradient(135deg, #1A1A2E 0%, #2D2D4A 100%);
  color: #E0E0F0;
  padding: 48px 24px 32px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] #site-footer {
  background: linear-gradient(135deg, #0A0A14 0%, #1A1A2E 100%);
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  filter: blur(80px);
  opacity: 0.3;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 32px;
  position: relative;
  z-index: 1;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 320px;
}

.footer-brand svg {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.footer-brand p {
  color: #B0B0CC;
  font-size: 0.9rem;
  margin: 0;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-meta p {
  color: #A0A0C0;
  font-size: 0.85rem;
  margin: 0;
}

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

.footer-meta a:hover {
  color: var(--accent-light);
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 1.3rem;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 40px rgba(108, 92, 231, 0.5);
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .nav-list a {
    padding: 8px 8px;
    font-size: 0.85rem;
  }

  #site-search input {
    width: 120px;
  }
}

@media (max-width: 960px) {
  nav[aria-label="主导航"] {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass-strong);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition), padding var(--transition);
    box-shadow: var(--shadow-lg);
  }

  nav[aria-label="主导航"].open {
    max-height: 600px;
    padding: 16px 0;
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 0 16px;
  }

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

  #menu-toggle {
    display: flex;
  }

  #site-search {
    display: none;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  #hero {
    padding: 56px 20px 72px;
  }

  main > section {
    padding: 40px 20px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 64px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .brand-name {
    font-size: 1rem;
  }

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

  #hero {
    padding: 40px 16px 56px;
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 14px 24px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat {
    padding: 18px 12px;
  }

  main > section {
    padding: 32px 16px;
  }

  #intro,
  #products,
  #solutions,
  #applications,
  #cases,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #legal {
    border-radius: var(--radius-md);
    margin-left: 12px;
    margin-right: 12px;
  }

  #breadcrumb {
    padding: 12px 16px;
  }

  .news-list {
    grid-template-columns: 1fr;
  }

  #articles article {
    padding: 20px;
  }

  .contact-list {
    grid-template-columns: 1fr;
  }

  #faq summary {
    padding: 16px 44px 16px 16px;
    font-size: 0.92rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 24px;
  }

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

@media (max-width: 380px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

/* ===== Reduced motion ===== */
@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:not(#hero):not(#breadcrumb) {
    opacity: 1;
    transform: none;
  }
}

/* ===== Print ===== */
@media print {
  #site-header,
  #back-to-top,
  .hero-actions,
  .header-tools {
    display: none !important;
  }

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

  main > section:not(#hero):not(#breadcrumb) {
    opacity: 1;
    transform: none;
  }
}

/* ===== Selection ===== */
::selection {
  background: rgba(108, 92, 231, 0.25);
  color: var(--text);
}

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 999px;
  border: 2px solid var(--bg);
}

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

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