:root {
  --ink: #0f172a;
  --slate: #475569;
  --muted: #94a3b8;
  --line: #e2e8f0;
  --white: #ffffff;
  --ice: #f8fafc;
  --ocean: #0ea5e9;
  --ocean-dark: #0284c7;
  --teal: #14b8a6;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --max-width: 1160px;
}

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

body {
  margin: 0;
  font-family: "Bahnschrift", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top, #f4f9ff 0%, #f7fbff 40%, #eef2f7 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(14, 165, 233, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 165, 233, 0.08) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.4;
  z-index: -1;
}

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

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  padding: 8px 16px;
  background: var(--ocean);
  color: var(--white);
  border-radius: 999px;
  z-index: 10;
}

.skip-link:focus {
  left: 16px;
}

.container {
  width: min(92vw, var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 23, 42, 0.9);
  color: var(--white);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(140deg, var(--ocean), var(--teal));
  display: grid;
  place-items: center;
  font-weight: 800;
  letter-spacing: 1px;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
}

.brand-note {
  font-size: 0.75rem;
  color: #cbd5f5;
}

.header-nav {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
  color: #dbeafe;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.2);
}

.btn-primary {
  background: var(--ocean);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--ocean-dark);
}

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

.btn-outline:hover {
  background: var(--ocean);
  color: var(--white);
}

.text-link {
  font-weight: 700;
  color: var(--ocean-dark);
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.text-link:hover {
  border-color: var(--ocean-dark);
}

.hero {
  padding: 64px 0 24px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 34px;
  align-items: center;
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 800;
  color: var(--ocean-dark);
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2.3rem, 3.4vw, 3.2rem);
  margin: 0 0 16px;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--slate);
  margin: 0 0 24px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow);
}

.meta-label {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
}

.meta-value {
  font-size: 0.95rem;
  font-weight: 700;
}

.hero-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-image-wrap {
  background: linear-gradient(140deg, rgba(14, 165, 233, 0.18), rgba(20, 184, 166, 0.2));
  padding: 24px;
  display: grid;
  place-items: center;
}

.hero-image-wrap img {
  width: 100%;
  height: 320px;
  object-fit: contain;
}

.hero-card-body {
  padding: 24px 26px 28px;
  display: grid;
  gap: 16px;
}

.hero-card-body h2 {
  margin: 0;
}

.hero-card-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.section {
  padding: 64px 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 26px;
}

.overview {
  background: var(--ice);
}

.overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
  align-items: center;
}

.overview-cards {
  display: grid;
  gap: 16px;
}

.overview-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.overview-card ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--slate);
}

.filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-pills span {
  padding: 6px 12px;
  background: #e0f2fe;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ocean-dark);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
}

.product-image {
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  padding: 14px;
  display: grid;
  place-items: center;
  min-height: 160px;
}

.product-image img {
  width: 100%;
  height: 150px;
  object-fit: contain;
}

.product-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.product-meta .price {
  font-weight: 800;
  color: var(--ocean-dark);
  font-size: 0.95rem;
}

.product-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.product-card p {
  margin: 0;
  color: var(--slate);
}

.product-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.4px;
}

.tag-adapter {
  background: #dbeafe;
  color: #1e3a8a;
}

.tag-highamp {
  background: #cffafe;
  color: #155e75;
}

.tag-fast {
  background: #fef3c7;
  color: #92400e;
}

.tag-portable {
  background: #e0f2fe;
  color: #0c4a6e;
}

.tag-charger {
  background: #ecfeff;
  color: #0e7490;
}

.tag-wifi {
  background: #ede9fe;
  color: #5b21b6;
}

.tag-station {
  background: #dcfce7;
  color: #166534;
}

.tag-level2 {
  background: #fee2e2;
  color: #991b1b;
}

.tag-accessory {
  background: #e2e8f0;
  color: #334155;
}

.tag-organizer {
  background: #f1f5f9;
  color: #1e293b;
}

.tag-maintenance {
  background: #dbeafe;
  color: #1e3a8a;
}

.tips {
  background: linear-gradient(140deg, #f8fafc, #eef2f7);
}

.tips-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) minmax(0, 1fr);
  gap: 28px;
}

.tips-card {
  background: var(--ink);
  color: var(--white);
  padding: 26px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}

.tips-list {
  display: grid;
  gap: 16px;
}

.tips-list h3 {
  margin: 0 0 6px;
}

.faq {
  background: var(--ice);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.faq details {
  background: var(--white);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.cta {
  background: var(--ink);
  color: var(--white);
}

.cta-inner {
  display: grid;
  gap: 18px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.site-footer {
  padding: 28px 0 40px;
  text-align: center;
  color: var(--slate);
}

@media (max-width: 980px) {
  .header-nav {
    display: none;
  }

  .hero-grid,
  .overview-grid,
  .tips-grid {
    grid-template-columns: 1fr;
  }

  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .hero-image-wrap img {
    height: 240px;
  }
}