:root {
  --bg: #0a0a0f;
  --bg-header: rgba(10, 10, 15, 0.95);
  --bg-card: #16161f;
  --bg-footer: #111118;
  --text: #e8e8f0;
  --muted: #9090a0;
  --dim: #606078;
  --blue: #3b82f6;
  --blue-light: #60a5fa;
  --blue-dark: #1d4ed8;
  --border: #2a2a3a;
  --red: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.3;
}

.logo-text span:last-child {
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.4;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px;
  position: relative;
  z-index: 2;
}

.main-nav a {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
  background: rgba(59, 130, 246, 0.12);
}

.hero {
  padding: 80px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-label {
  display: inline-block;
  color: var(--blue-light);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 16px;
}

.hero-content h1 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-content p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 28px;
}

.hero-actions,
.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.cta-actions {
  margin-bottom: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1.6px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-solid {
  color: #fff;
  background: var(--blue);
}

.btn-solid:hover {
  background: #2563eb;
}

.btn-outline {
  color: var(--blue-light);
  background: transparent;
  border-color: var(--blue);
}

.btn-outline:hover {
  background: rgba(59, 130, 246, 0.1);
}

.hero-stats {
  display: flex;
  gap: 24px;
}

.stat-item strong {
  display: block;
  color: var(--blue-light);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.6;
}

.stat-item span {
  display: block;
  color: var(--dim);
  font-size: 0.8rem;
}

.hero-visual {
  position: relative;
}

.monitor-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  aspect-ratio: 16 / 9;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.monitor-status {
  position: absolute;
  top: 12px;
  left: 12px;
  color: var(--red);
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 1;
}

.monitor-time {
  position: absolute;
  left: 12px;
  bottom: 12px;
  color: var(--dim);
  font-size: 0.8rem;
  z-index: 1;
}

.section {
  padding: 40px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-tag {
  display: inline-block;
  color: var(--blue-light);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 20px;
  padding: 4px 16px;
  margin-bottom: 12px;
  font-size: 0.85rem;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-desc {
  color: var(--muted);
  max-width: 720px;
  margin: 0 auto;
  font-size: 1rem;
}

.tags-wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 18px;
  font-size: 0.9rem;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.tag:hover {
  color: var(--blue-light);
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.08);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.video-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  color: inherit;
  transition: transform 0.2s, border-color 0.2s;
}

.video-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.4);
}

.card-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  color: var(--blue-light);
  background: rgba(0, 0, 0, 0.7);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.card-body {
  padding: 16px;
}

.card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-body p {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 12px;
  line-height: 1.5;
}

.card-meta {
  display: flex;
  gap: 16px;
  color: var(--dim);
  font-size: 0.8rem;
}

.card-meta a {
  color: var(--blue-light);
}

.card-meta a:hover {
  color: var(--text);
}

.section-footer {
  text-align: center;
  margin-top: 32px;
}

.page-links {
  justify-content: center;
  margin-top: 8px;
}

.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  font-size: 0.9rem;
  transition: color 0.2s, border-color 0.2s;
}

.back-home:hover {
  color: var(--blue-light);
  border-color: var(--blue);
}

.col-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.col-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s;
}

a.col-card:hover,
a.community-card:hover,
a.tutorial-item:hover,
a.brand-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.4);
}

.col-icon {
  display: block;
  font-size: 40px;
  margin-bottom: 16px;
  line-height: 1.6;
}

.col-card h3,
.community-card h3,
.brand-card h3,
.ai-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.col-card p,
.community-card p,
.brand-card p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.col-list,
.brand-list {
  color: var(--muted);
  font-size: 0.9rem;
}

.col-list li,
.brand-list li {
  position: relative;
  padding: 6px 0 6px 16px;
  border-top: 1px solid var(--border);
}

.col-list li::before,
.brand-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}

.ai-showcase {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.ai-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-align: center;
  color: inherit;
  transition: transform 0.2s, border-color 0.2s;
}

.ai-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.4);
}

.ai-card img {
  width: 100%;
  height: 205px;
  object-fit: cover;
}

.ai-card h3 {
  padding: 12px 12px 4px;
  line-height: 1.3;
}

.ai-card p {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0 12px 16px;
}

.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.community-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s;
}

.comm-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--blue);
}

.comm-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.comm-stats {
  display: flex;
  justify-content: center;
  gap: 20px;
  color: var(--dim);
  font-size: 0.8rem;
}

.tutorial-list,
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.tutorial-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  color: inherit;
}

.tutorial-num {
  color: var(--blue);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  min-width: 48px;
}

.tutorial-content h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.tutorial-content p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.tutorial-lessons {
  display: inline-block;
  color: var(--blue-light);
  background: rgba(59, 130, 246, 0.1);
  border-radius: 10px;
  padding: 2px 12px;
  font-size: 0.8rem;
}

.cta-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
}

.cta-content h2 {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.cta-content p {
  color: var(--muted);
  margin-bottom: 24px;
}

.cta-visual img {
  width: 100%;
  height: 288px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
}

.faq-item h3 {
  position: relative;
  font-size: 1rem;
  font-weight: 700;
  padding-right: 24px;
  cursor: pointer;
  line-height: 1.3;
}

.faq-item h3::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  color: var(--blue-light);
  font-weight: 400;
}

.faq-item.open h3::after {
  content: "−";
}

.faq-item p {
  display: none;
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 10px;
}

.faq-item.open h3 {
  margin-bottom: 8px;
}

.faq-item.open p {
  display: block;
}

.brand-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.brand-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  color: inherit;
  transition: border-color 0.2s, transform 0.2s;
}

.brand-card-icon {
  display: block;
  font-size: 32px;
  margin-bottom: 12px;
}

.brand-update {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.update-badge {
  display: inline-block;
  color: var(--blue-light);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 14px;
  padding: 4px 14px;
  font-size: 0.8rem;
}

.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
  margin-top: 40px;
}

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

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand h2 {
  font-size: 1.1rem;
  font-weight: 800;
}

.footer-desc {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-links h3,
.footer-contact h3 {
  font-size: 1rem;
  margin-bottom: 16px;
}

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

.footer-links a,
.footer-contact p {
  color: var(--muted);
  font-size: 0.9rem;
}

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

.footer-contact p {
  margin-bottom: 8px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--blue-light);
}

.footer-bottom a:hover {
  color: var(--text);
}

.auto-link {
  color: var(--blue-light);
  border-bottom: 1px dashed rgba(59, 130, 246, 0.45);
  transition: color 0.2s, border-color 0.2s;
}

.auto-link:hover {
  color: var(--text);
  border-bottom-color: var(--blue-light);
}

.spider-links {
  padding-top: 20px;
}

.spider-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.spider-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.spider-card-link {
  display: block;
  color: inherit;
}

.spider-card-link h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.spider-card-link p {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.spider-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.spider-kw {
  display: inline-block;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.22);
  border-bottom: 1px solid rgba(59, 130, 246, 0.22);
}

@media (max-width: 1024px) {
  .card-grid,
  .ai-showcase,
  .spider-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-content h1 {
    font-size: 1.9rem;
  }
}

@media (max-width: 1100px) {
  .menu-toggle {
    display: block;
  }

  .header-inner {
    position: relative;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    background: rgba(10, 10, 15, 0.98);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px;
    z-index: 20;
  }

  .main-nav.open {
    display: flex;
  }

  .hero,
  .hero-grid,
  .cta-box,
  .brand-grid,
  .footer-grid,
  .col-grid,
  .community-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 48px 0 36px;
  }

  .cta-box {
    padding: 28px;
  }

  .cta-visual img {
    height: 220px;
  }

  .tutorial-list,
  .faq-list {
    max-width: none;
  }
}

@media (max-width: 600px) {
  .card-grid,
  .ai-showcase,
  .spider-grid {
    grid-template-columns: 1fr;
  }

  .hero-content h1,
  .section-header h2,
  .cta-content h2 {
    font-size: 1.55rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }

  .ai-card img {
    height: 180px;
  }
}