:root {
  --primary: #0a2540;
  --secondary: #635bff;
  --accent: #00d924;
  --bg-light: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --danger: #ef4444;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background-color: var(--bg-light);
  line-height: 1.6;
}

.top-bar {
  background: var(--primary);
  color: #fff;
  padding: 8px 24px;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.top-bar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo span {
  color: var(--secondary);
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  transition: color 0.2s;
}

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

.hero-banner {
  background: linear-gradient(135deg, #0a2540 0%, #1a365d 100%);
  color: #ffffff;
  padding: 56px 24px;
  text-align: center;
}

.hero-banner h1 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero-banner p {
  font-size: 18px;
  max-width: 820px;
  margin: 0 auto 24px;
  color: #cbd5e1;
}

.badge-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.badge {
  background: rgba(255, 255, 255, 0.12);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.main-content {
  max-width: 1240px;
  margin: 40px auto;
  padding: 0 24px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 24px;
  border-left: 5px solid var(--secondary);
  padding-left: 12px;
}

.data-table-container {
  background: var(--card-bg);
  border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  margin-bottom: 40px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  background: #f1f5f9;
  padding: 14px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  border-bottom: 2px solid var(--border);
}

.data-table td {
  padding: 14px 18px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table tr:hover {
  background-color: #f8fafc;
}

.tag-grade {
  background: #e0f2fe;
  color: #0369a1;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  display: inline-block;
}

.tag-in-stock {
  background: #dcfce7;
  color: #15803d;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  display: inline-block;
}

.price {
  font-size: 16px;
  font-weight: 800;
  color: var(--primary);
}

.info-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.info-card {
  background: var(--card-bg);
  padding: 24px;
  border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.info-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}

.info-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
}

.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 48px 24px 24px;
  border-top: 1px solid #1e293b;
  font-size: 14px;
}

.footer-container {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-col h4 {
  color: #f8fafc;
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-bottom {
  max-width: 1240px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid #1e293b;
  text-align: center;
  font-size: 13px;
  color: #64748b;
}