:root {
  --bg: #0a0e17;
  --bg-card: #111827;
  --bg-elevated: #1a2234;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --primary: #3b82f6;
  --primary-glow: rgba(59, 130, 246, 0.35);
  --accent: #8b5cf6;
  --accent-glow: rgba(139, 92, 246, 0.3);
  --border: rgba(148, 163, 184, 0.15);
  --gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
  --radius: 14px;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(139, 92, 246, 0.1), transparent);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.75;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #60a5fa;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(10, 14, 23, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.site-nav a {
  padding: 8px 15px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text);
  background: var(--bg-elevated);
  border-color: var(--border);
}

.hero {
  padding: 68px 0 52px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 5px 14px;
  margin-bottom: 18px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(1.9rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.25;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .lead {
  max-width: 660px;
  margin: 0 auto 28px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 11px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 6px 28px var(--primary-glow);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 36px var(--accent-glow);
}

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

.btn-outline:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.section {
  padding: 52px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 36px;
}

.section-title h2 {
  margin: 0 0 10px;
  font-size: 1.65rem;
  font-weight: 700;
}

.section-title p {
  margin: 0;
  color: var(--text-muted);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}

.product-card {
  padding: 26px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: border-color 0.2s, transform 0.2s;
}

.product-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-3px);
}

.product-card .tag {
  display: inline-block;
  padding: 3px 10px;
  margin-bottom: 12px;
  border-radius: 6px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
}

.product-card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.product-card p {
  margin: 0 0 16px;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 22px;
}

.feature-card {
  padding: 26px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: rgba(139, 92, 246, 0.35);
}

.feature-icon {
  width: 46px;
  height: 46px;
  margin-bottom: 14px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 21px;
  background: var(--bg-elevated);
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}

.download-card {
  padding: 22px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  text-align: center;
}

.download-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.download-card p {
  margin: 0 0 14px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.download-card .btn {
  width: 100%;
}

.content-block {
  padding: 30px;
  margin-bottom: 22px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.content-block h2 {
  margin: 0 0 14px;
  font-size: 1.35rem;
}

.content-block h3 {
  margin: 22px 0 8px;
  font-size: 1.05rem;
}

.content-block p,
.content-block li {
  color: var(--text-muted);
}

.content-block ul,
.content-block ol {
  padding-left: 1.4em;
}

.article-list {
  display: grid;
  gap: 18px;
}

.article-item {
  display: block;
  padding: 22px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: border-color 0.2s;
}

.article-item:hover {
  border-color: rgba(59, 130, 246, 0.4);
}

.article-item h3 {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 1.12rem;
}

.article-item p {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.article-meta {
  color: var(--text-muted);
  font-size: 0.84rem;
}

.article-body h2 {
  margin: 28px 0 10px;
  font-size: 1.25rem;
}

.article-body h3 {
  margin: 20px 0 8px;
  font-size: 1.02rem;
}

.article-body p,
.article-body li {
  color: var(--text-muted);
}

.daily-tip {
  padding: 18px 22px;
  margin-bottom: 26px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(139, 92, 246, 0.12));
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.daily-tip h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
  color: var(--primary);
}

.daily-tip p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.93rem;
}

.faq-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.faq-item p {
  margin: 0;
  color: var(--text-muted);
}

.site-footer {
  margin-top: 56px;
  padding: 30px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer p {
  margin: 0 0 6px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 14px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.breadcrumb {
  padding: 14px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

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

.page-header {
  padding: 36px 0 20px;
}

.page-header h1 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
}

.page-header .lead {
  margin: 0;
  color: var(--text-muted);
  max-width: 700px;
}

@media (max-width: 640px) {
  .site-nav a {
    padding: 6px 11px;
    font-size: 13px;
  }

  .hero {
    padding: 44px 0 36px;
  }

  .content-block {
    padding: 18px;
  }
}