/* SwapLoop Module F — Tech Innovation */
:root {
  --color-bg: #18181b;
  --color-surface: #27272a;
  --color-surface-alt: #3f3f46;
  --color-text: #fafafa;
  --color-muted: #a1a1aa;
  --color-primary: #2563eb;
  --color-accent: #22d3ee;
  --color-accent-2: #2563eb;
  --color-line: #52525b;
  --color-card: #27272a;
  --color-focus: #22d3ee;
  --color-btn-text: #18181b;
  --color-hero-overlay: rgba(24,24,27,0.72);
  --color-header-bg: rgba(24,24,27,0.95);
  --color-type-swap: #22d3ee;
  --color-type-charge: #2563eb;
  --color-type-hybrid: #a78bfa;
  --font-display: "Segoe UI", Calibri, sans-serif;
  --font-body: "Segoe UI", Calibri, sans-serif;
  --font-mono: Consolas, monospace;
  --container: 72rem;
  --header-h: 4.25rem;
  --radius: 0.75rem;
  --shadow: 0 12px 32px rgba(0,0,0,0.18);
  --transition: 180ms ease;
  --bp-tablet: 768px;
  --bp-desktop: 1024px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition); }
a:focus-visible, button:focus-visible, .btn:focus-visible, label:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}
h1, h2, h3 { font-family: var(--font-display); line-height: 1.2; }
h1 { font-size: clamp(1.85rem, 1.2rem + 2vw, 3rem); margin: 0 0 0.75rem; }
h2 { font-size: clamp(1.35rem, 1rem + 1vw, 2rem); margin: 0 0 1rem; }
h3 { font-size: 1.15rem; margin: 0 0 0.5rem; }
p { margin: 0 0 1rem; }
code { font-family: var(--font-mono); font-size: 0.92em; }
.container { width: min(var(--container), 100% - 2rem); margin-inline: auto; }
.narrow { max-width: 42rem; }
.center { text-align: center; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 1rem; top: -100%; z-index: 2000;
  background: var(--color-accent); color: var(--color-btn-text);
  padding: 0.5rem 0.75rem; border-radius: 0.375rem; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(8px);
}
.header-inner {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  min-height: var(--header-h); gap: 1rem;
}
.logo {
  display: inline-flex; align-items: center; gap: 0.5rem;
  text-decoration: none; color: var(--color-text); font-weight: 700;
}
.logo img { width: auto; height: 2rem; }
.logo-text { font-family: var(--font-display); letter-spacing: -0.02em; }

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
  display: flex; align-items: center; justify-content: center;
  width: 2.75rem; height: 2.75rem; cursor: pointer; border-radius: 0.5rem;
  border: 1px solid var(--color-line);
}
.nav-toggle-label span:last-child {
  width: 1.25rem; height: 2px; background: var(--color-text);
  box-shadow: 0 -6px 0 var(--color-text), 0 6px 0 var(--color-text);
}
.main-nav ul {
  list-style: none; margin: 0; padding: 0; display: flex; gap: 0.25rem;
}
.main-nav a {
  display: block; padding: 0.5rem 0.75rem; border-radius: 0.5rem;
  text-decoration: none; color: var(--color-text); font-weight: 600;
}
.main-nav a:hover { background: var(--color-surface-alt); color: var(--color-accent); }
.main-nav a[aria-current="page"] {
  background: var(--color-primary); color: var(--color-btn-text);
}

@media (max-width: 767px) {
  .main-nav {
    position: absolute; left: 0; right: 0; top: var(--header-h);
    background: var(--color-header-bg); border-bottom: 1px solid var(--color-line);
    max-height: 0; overflow: hidden; transition: max-height var(--transition);
  }
  .main-nav ul { flex-direction: column; padding: 0.5rem 1rem 1rem; }
  .nav-toggle:checked ~ .main-nav { max-height: 18rem; }
  .site-header { position: sticky; }
  .site-header .container { position: relative; }
}

.section { padding: clamp(2.5rem, 2rem + 2vw, 4rem) 0; }
.section-alt { background: var(--color-surface-alt); }
.page-hero { padding: calc(var(--header-h) + 2rem) 0 2rem; background: var(--color-surface); border-bottom: 1px solid var(--color-line); }
.lead { font-size: 1.125rem; color: var(--color-muted); max-width: 46ch; }

.hero {
  position: relative; min-height: clamp(28rem, 60vh, 40rem);
  display: grid; align-items: center; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0;
}
.hero::after {
  content: ""; position: absolute; inset: 0; background: var(--color-hero-overlay); z-index: 1;
}
.hero-content {
  position: relative; z-index: 2; color: #fff; padding: calc(var(--header-h) + 2rem) 0 3rem;
}
.hero .eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.8rem; opacity: 0.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.25rem; }

@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(1.25rem); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-animate .hero-content > * {
  animation: heroFadeUp 800ms ease both;
}
.hero-animate .hero-content > *:nth-child(2) { animation-delay: 120ms; }
.hero-animate .hero-content > *:nth-child(3) { animation-delay: 220ms; }
.hero-animate .hero-content > *:nth-child(4) { animation-delay: 320ms; }

.btn {
  display: inline-block; padding: 0.75rem 1.25rem; border-radius: 999px;
  text-decoration: none; font-weight: 700; border: 2px solid transparent;
}
.btn-primary { background: var(--color-accent); color: var(--color-btn-text); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-secondary {
  background: transparent; color: inherit; border-color: currentColor;
}
.btn-secondary:hover { background: rgba(255,255,255,0.12); }

.step-cards {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1rem;
}
.step-cards li {
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius); padding: 1.25rem;
  display: grid; gap: 0.5rem;
}
.step-num {
  width: 2rem; height: 2rem; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700;
  background: var(--color-accent); color: var(--color-btn-text);
}
.section-cta { margin-top: 1.5rem; }
.text-link { font-weight: 600; }

.featured-teaser {
  display: grid; gap: 1.5rem; align-items: center;
}
.featured-teaser figure {
  margin: 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}

.type-badge {
  display: inline-block; padding: 0.2rem 0.55rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em;
  border: 1px solid currentColor;
}
.type-swap { color: var(--color-type-swap); }
.type-charge { color: var(--color-type-charge); }
.type-hybrid { color: var(--color-type-hybrid); }

.timeline {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1.25rem; position: relative;
}
.timeline li {
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius); padding: 1.25rem 1.25rem 1.25rem 3rem;
  position: relative;
}
.timeline li::before {
  content: counter(step); counter-increment: step;
  position: absolute; left: 1rem; top: 1.15rem;
  width: 1.5rem; height: 1.5rem; border-radius: 50%;
  background: var(--color-accent); color: var(--color-btn-text);
  display: grid; place-items: center; font-size: 0.8rem; font-weight: 700;
}
.timeline { counter-reset: step; }

.data-table {
  width: 100%; border-collapse: collapse; background: var(--color-card);
  border: 1px solid var(--color-line); border-radius: var(--radius); overflow: hidden;
}
.data-table th, .data-table td {
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--color-line); text-align: left;
}
.data-table th { background: var(--color-surface-alt); }

.safety-note {
  display: grid; gap: 1rem; align-items: start;
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius); padding: 1.5rem;
}

.tabs input[type="radio"] { position: absolute; opacity: 0; pointer-events: none; }
.tab-labels {
  display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem;
}
.tab-labels label {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.55rem 0.85rem; border-radius: 999px;
  border: 1px solid var(--color-line); cursor: pointer; font-weight: 600;
  transition: background var(--transition), color var(--transition);
}
#tab-swap:checked ~ .tab-labels label[for="tab-swap"],
#tab-charge:checked ~ .tab-labels label[for="tab-charge"],
#tab-hybrid:checked ~ .tab-labels label[for="tab-hybrid"] {
  background: var(--color-primary); color: var(--color-btn-text); border-color: transparent;
}
.tab-panel { display: none; background: var(--color-card); border: 1px solid var(--color-line); border-radius: var(--radius); padding: 1.25rem; }
#tab-swap:checked ~ .tab-panels #panel-swap { display: block; }
#tab-charge:checked ~ .tab-panels #panel-charge { display: block; }
#tab-hybrid:checked ~ .tab-panels #panel-hybrid { display: block; }

.station-card {
  display: grid; gap: 1.5rem; margin-bottom: 2.5rem;
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius); padding: 1.25rem;
}
.station-media { margin: 0; border-radius: var(--radius); overflow: hidden; }

.coverage {
  display: grid; gap: 1.5rem; align-items: center;
}
.map-wrap { margin: 0; opacity: 0.85; }
.coming-soon { color: var(--color-muted); }

.riders-layout { display: block; }
.price-sticky {
  background: var(--color-surface); border-bottom: 1px solid var(--color-line);
  padding: 1.5rem 0;
}
.highlight {
  font-size: 1.125rem; font-weight: 700; padding: 1rem;
  border-left: 4px solid var(--color-accent); background: var(--color-surface-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.checklist { padding-left: 1.25rem; }
.note { color: var(--color-muted); }

.plan-grid {
  display: grid; gap: 1.25rem;
}
.plan-card {
  background: var(--color-card); border: 1px solid var(--color-line);
  border-radius: var(--radius); padding: 1.5rem;
}
.plan-card ul { margin: 0; padding-left: 1.25rem; }
.plan-card--featured { border-color: var(--color-accent); box-shadow: var(--shadow); }
.plan-note { font-size: 0.92rem; color: var(--color-muted); margin-bottom: 0; }
.priority-block {
  display: grid; gap: 1.5rem; align-items: center;
}
.priority-block figure { margin: 0; }
.partners { color: var(--color-muted); font-size: 0.95rem; }

.site-footer {
  border-top: 1px solid var(--color-line);
  background: var(--color-surface);
  padding: 2rem 0;
}
.footer-inner { display: grid; gap: 0.75rem; }
.footer-links {
  list-style: none; margin: 0; padding: 0; display: flex; gap: 1rem; flex-wrap: wrap;
}
.footer-links a { font-weight: 600; }

@media (min-width: 768px) {
  .step-cards { grid-template-columns: repeat(3, 1fr); }
  .featured-teaser { grid-template-columns: 1.1fr 0.9fr; }
  .compare-grid { overflow-x: auto; }
  .coverage { grid-template-columns: auto 1fr; }
  .plan-grid { grid-template-columns: 1fr 1fr; }
  .priority-block { grid-template-columns: 1.2fr 0.8fr; }
}

@media (min-width: 1024px) {
  .nav-toggle-label { display: none; }
  .main-nav { position: static; max-height: none !important; overflow: visible; }
  .main-nav ul { flex-direction: row; padding: 0; }

  .timeline {
    grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
  }
  .timeline li { padding-top: 3rem; padding-left: 1.25rem; }
  .timeline li::before { left: 1.25rem; top: 1rem; }
  .timeline::after {
    content: ""; position: absolute; top: 1.65rem; left: 8%; right: 8%;
    height: 2px; background: var(--color-line); z-index: 0;
  }

  .station-card--overlap {
    grid-template-columns: 1fr 1.1fr; align-items: center;
    padding: 2rem; overflow: visible;
  }
  .station-card--reverse { grid-template-columns: 1.1fr 1fr; }
  .station-card--reverse .station-media { order: -1; }
  .station-card--overlap .station-media {
    margin-right: -2.5rem; transform: translateY(-0.75rem);
    box-shadow: var(--shadow);
  }
  .station-card--reverse .station-media { margin-right: 0; margin-left: -2.5rem; }

  .riders-layout {
    display: grid; grid-template-columns: minmax(16rem, 22rem) 1fr; gap: 2rem;
    align-items: start; padding: 2rem 0;
  }
  .riders-layout .container { width: 100%; margin: 0; padding: 0 1rem; }
  .price-sticky {
    position: sticky; top: calc(var(--header-h) + 1rem);
    border: 1px solid var(--color-line); border-radius: var(--radius);
    padding: 1.25rem; background: var(--color-card);
  }
  .price-table thead th { position: sticky; top: 0; background: var(--color-surface-alt); z-index: 1; }
}

/* Signature: neon grid atmosphere */
body {
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(120deg, rgba(37, 99, 235, 0.25), transparent 55%);
  pointer-events: none;
}
.section-alt {
  border-top: 1px solid rgba(34, 211, 238, 0.2);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero-animate .hero-content > * { opacity: 1; transform: none; }
}