:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --accent: #06b6d4;
  --bg-dark: #0f172a;
  --bg-light: #f1f5f9;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --white: #fff;
  --shadow: 0 4px 24px rgba(15, 23, 42, .1);
  --radius: 14px;
}

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

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

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; }

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

.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, .92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 15px;
  color: rgba(255,255,255,.85);
  transition: color .2s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 26px;
  background: linear-gradient(135deg, var(--primary), #6366f1);
  color: #fff !important;
  border-radius: 26px;
  font-size: 15px;
  font-weight: 500;
  transition: transform .2s, box-shadow .2s;
  border: none;
  cursor: pointer;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, .4);
}

.btn-outline {
  background: transparent;
  border: 2px solid rgba(255,255,255,.4);
  color: #fff !important;
}

.btn-outline:hover {
  background: rgba(255,255,255,.1);
  border-color: #fff;
}

.hero {
  padding: 150px 0 90px;
  background: linear-gradient(160deg, var(--bg-dark) 0%, #1e1b4b 50%, #0f172a 100%);
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(79,70,229,.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(6,182,212,.1) 0%, transparent 40%);
  pointer-events: none;
}

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

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(79, 70, 229, .25);
  border: 1px solid rgba(129, 140, 248, .4);
  border-radius: 20px;
  font-size: 14px;
  color: #a5b4fc;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 46px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
}

.hero h1 span {
  background: linear-gradient(90deg, #818cf8, #22d3ee);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,.75);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-actions .btn-download {
  padding: 14px 38px;
  font-size: 17px;
}

.section { padding: 80px 0; }
.section-alt { background: var(--bg-light); }

.section-title {
  text-align: center;
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 14px;
}

.section-subtitle {
  text-align: center;
  font-size: 16px;
  color: var(--text-light);
  max-width: 580px;
  margin: 0 auto 48px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 34px 26px;
  box-shadow: var(--shadow);
  transition: transform .3s;
  border: 1px solid var(--border);
}

.feature-card:hover { transform: translateY(-4px); }

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #eef2ff, #ecfeff);
}

.feature-card h3 { font-size: 19px; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-light); line-height: 1.75; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.stat-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.stat-item .num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.stat-item .label {
  font-size: 13px;
  color: var(--text-light);
}

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

.scene-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 30px 24px;
  border: 1px solid var(--border);
  transition: border-color .2s, box-shadow .2s;
}

.scene-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.scene-card .icon { font-size: 36px; margin-bottom: 14px; }
.scene-card h4 { font-size: 17px; margin-bottom: 8px; }
.scene-card p { font-size: 14px; color: var(--text-light); }

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.review-stars { color: #f59e0b; font-size: 18px; margin-bottom: 14px; }
.review-card blockquote {
  font-size: 15px;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: normal;
}

.review-author { font-size: 13px; color: var(--text-light); }

.compare-table {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.compare-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  border-bottom: 1px solid var(--border);
}

.compare-row:last-child { border-bottom: none; }

.compare-row.header {
  background: var(--bg-dark);
  color: #fff;
  font-weight: 600;
}

.compare-cell {
  padding: 18px 20px;
  font-size: 14px;
  text-align: center;
}

.compare-cell:first-child { text-align: left; font-weight: 500; }

.compare-cell.highlight { color: var(--primary); font-weight: 600; }

.faq-list { max-width: 760px; margin: 0 auto; }

.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background .2s;
}

.faq-question:hover { background: var(--bg-light); }

.faq-question::after {
  content: '+';
  font-size: 22px;
  color: var(--primary);
  transition: transform .2s;
}

.faq-item.open .faq-question::after { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}

.faq-item.open .faq-answer { max-height: 300px; }

.faq-answer p {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

.promo-banner {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  border-radius: var(--radius);
  padding: 48px 40px;
  text-align: center;
  color: #fff;
  margin-top: 48px;
}

.promo-banner h3 { font-size: 26px; margin-bottom: 12px; }
.promo-banner p { font-size: 16px; opacity: .9; margin-bottom: 24px; }

.promo-banner .btn-download {
  background: #fff;
  color: var(--primary) !important;
}

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

.platform-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  transition: border-color .2s, box-shadow .2s;
}

.platform-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.platform-item .icon { font-size: 40px; margin-bottom: 12px; }
.platform-item h4 { font-size: 16px; margin-bottom: 8px; }
.platform-item p { font-size: 13px; color: var(--text-light); }

.article-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .3s;
  border: 1px solid var(--border);
}

.article-card:hover { transform: translateY(-4px); }

.article-thumb {
  height: 170px;
  background: linear-gradient(135deg, #eef2ff, #ecfeff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 46px;
}

.article-body { padding: 22px; }
.article-body h3 { font-size: 17px; margin-bottom: 10px; line-height: 1.4; }
.article-body p { font-size: 14px; color: var(--text-light); margin-bottom: 14px; }
.article-meta { font-size: 12px; color: #94a3b8; }

.article-tag {
  display: inline-block;
  padding: 2px 10px;
  background: #eef2ff;
  color: var(--primary);
  border-radius: 4px;
  font-size: 12px;
  margin-bottom: 10px;
}

.download-hero {
  padding: 130px 0 60px;
  background: linear-gradient(160deg, var(--bg-dark), #1e1b4b);
  text-align: center;
  color: #fff;
}

.download-hero h1 { font-size: 40px; margin-bottom: 16px; }
.download-hero .hero-desc { color: rgba(255,255,255,.75); }

.download-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.download-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 38px 28px;
  box-shadow: var(--shadow);
  text-align: center;
  border: 1px solid var(--border);
}

.download-card .icon { font-size: 54px; margin-bottom: 18px; }
.download-card h3 { font-size: 21px; margin-bottom: 10px; }
.download-card p { font-size: 14px; color: var(--text-light); margin-bottom: 22px; }
.download-card .version { font-size: 13px; color: #94a3b8; margin-bottom: 18px; }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.step-item {
  text-align: center;
  padding: 24px 16px;
}

.step-num {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  margin: 0 auto 14px;
}

.step-item h4 { font-size: 16px; margin-bottom: 8px; }
.step-item p { font-size: 13px; color: var(--text-light); }

.version-list { max-width: 760px; margin: 0 auto; }

.version-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 10px;
  border: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.version-item .info { flex: 1; min-width: 200px; }
.version-item .ver { font-weight: 600; margin-bottom: 4px; }
.version-item .desc { font-size: 13px; color: var(--text-light); }

.article-page { padding: 100px 0 60px; }
.article-page .container { max-width: 800px; }
.article-page h1 { font-size: 32px; line-height: 1.4; margin-bottom: 16px; }
.article-page .meta {
  font-size: 14px;
  color: #94a3b8;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-content { font-size: 16px; line-height: 1.9; color: #475569; }
.article-content h2 { font-size: 23px; margin: 34px 0 14px; color: var(--text); }
.article-content p { margin-bottom: 18px; }
.article-content ul { margin: 14px 0 18px 24px; }
.article-content li { margin-bottom: 8px; }

.footer {
  background: var(--bg-dark);
  color: #94a3b8;
  padding: 48px 0 24px;
}

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

.footer h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { font-size: 14px; color: #94a3b8; transition: color .2s; }
.footer ul a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #64748b;
}

@media (max-width: 992px) {
  .feature-grid, .scene-grid, .review-grid, .article-list, .download-cards { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .platform-grid, .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 30px; }
  .feature-grid, .scene-grid, .review-grid, .article-list, .download-cards, .platform-grid, .steps-grid, .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .compare-row { grid-template-columns: 1fr; }
  .compare-row.header { display: none; }
}