:root {
  --bg-primary: #0a1628;
  --bg-secondary: #111d33;
  --bg-card: #162240;
  --bg-card-hover: #1c2b4f;
  --text-primary: #e8edf5;
  --text-secondary: #9aabbf;
  --text-muted: #6b7d94;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --border: #1e2d4a;
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

[data-theme="light"] {
  --bg-primary: #f5f7fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f4ff;
  --text-primary: #1a2332;
  --text-secondary: #4a5568;
  --text-muted: #8899aa;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.15);
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: var(--font);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

[data-theme="light"] .navbar {
  background: rgba(245, 247, 251, 0.9);
}

.navbar.scrolled {
  box-shadow: var(--shadow);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.nav-brand svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

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

.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0 12px;
  height: 38px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.85rem;
  width: 140px;
  font-family: var(--font);
}

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

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  transition: color var(--transition);
}

.search-box button:hover {
  color: var(--accent);
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(20deg);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: all var(--transition);
}

.mobile-menu-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.breadcrumb {
  padding: 16px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

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

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

.breadcrumb span {
  margin: 0 6px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 60px 0 50px;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: heroGlow 8s ease-in-out infinite alternate;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes heroGlow {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.6;
  }
  100% {
    transform: translate(-30px, 30px) scale(1.15);
    opacity: 1;
  }
}

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

.hero-slide {
  display: none;
  animation: fadeIn 0.6s ease;
}

.hero-slide.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
  border: 1px solid rgba(59, 130, 246, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  font-family: var(--font);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  color: #fff;
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-dots {
  display: flex;
  gap: 8px;
  margin-top: 28px;
}

.hero-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  padding: 0;
  background: var(--border);
  transition: all var(--transition);
}

.hero-dots button.active {
  background: var(--accent);
  width: 28px;
  border-radius: 5px;
}

.hero-dots button:hover {
  background: var(--accent);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 44px;
  position: relative;
  z-index: 1;
}

.stat-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.stat-item:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  background: var(--bg-card-hover);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--accent);
  transition: all var(--transition);
}

.card:hover .card-icon {
  transform: scale(1.1) rotate(-4deg);
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-list {
  display: grid;
  gap: 20px;
}

.article-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.article-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta .tag {
  background: var(--accent-glow);
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.article-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.article-item h3 a {
  color: var(--text-primary);
}

.article-item h3 a:hover {
  color: var(--accent);
}

.article-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.article-more:hover {
  gap: 8px;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.faq-item:hover {
  border-color: var(--accent);
}

.faq-item.open {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  text-align: left;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--accent);
}

.faq-question .arrow {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--text-muted);
}

.faq-item.open .faq-question .arrow {
  transform: rotate(180deg);
  color: var(--accent);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 24px 22px;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.howto-steps {
  counter-reset: step;
  display: grid;
  gap: 0;
  max-width: 860px;
  margin: 0 auto;
}

.howto-step {
  position: relative;
  padding: 0 0 36px 60px;
  counter-increment: step;
}

.howto-step::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 0 0 6px var(--accent-glow);
  transition: transform var(--transition);
}

.howto-step:hover::before {
  transform: scale(1.1);
}

.howto-step:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 19px;
  top: 46px;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.howto-step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.howto-step p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.team-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.team-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  transition: transform var(--transition);
}

.team-card:hover .team-avatar {
  transform: scale(1.08);
}

.team-card h3 {
  font-size: 1rem;
  font-weight: 700;
}

.team-card .role {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  margin: 4px 0 10px;
}

.team-card p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.contact-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.contact-item:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.contact-item svg {
  flex-shrink: 0;
  color: var(--accent);
  margin-top: 2px;
}

.contact-item h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-top: 14px;
  max-width: 340px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col ul {
  display: grid;
  gap: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-col a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.82rem;
}

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

.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px var(--accent-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  z-index: 900;
}

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

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: menuSlide 0.3s ease;
}

@keyframes menuSlide {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
}

.mobile-menu a:hover {
  background: var(--bg-card);
  color: var(--accent);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero::before,
  .hero::after {
    opacity: 0.5;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .search-box {
    display: none;
  }
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .section {
    padding: 48px 0;
  }
  .hero {
    padding: 40px 0 36px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .hero::before,
  .hero::after {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .stat-item {
    padding: 18px 12px;
  }
  .stat-number {
    font-size: 1.5rem;
  }
  .card {
    padding: 22px;
  }
  .article-item {
    padding: 20px;
  }
  .howto-step {
    padding-left: 48px;
  }
  .howto-step::before {
    width: 34px;
    height: 34px;
    font-size: 0.85rem;
  }
  .howto-step:not(:last-child)::after {
    left: 16px;
    top: 40px;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

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

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
}

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

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