/* ============================================================
   3D Flight Radar — Site Styles
   Adaptive dark/light theme with prefers-color-scheme
   ============================================================ */

/* ── Design tokens ─────────────────────────────────────────── */

:root {
  /* Dark mode (default) */
  --color-bg:          #0b0f1a;
  --color-surface:     #131825;
  --color-surface-2:   #1a2030;
  --color-border:      rgba(255, 255, 255, 0.08);
  --color-text:        #c8cdd8;
  --color-text-dim:    rgba(255, 255, 255, 0.5);
  --color-heading:     #f0f2f5;
  --color-accent:      #38bdf8;
  --color-accent-hover:#60ccfa;
  --color-accent-dim:  rgba(56, 189, 248, 0.12);
  --color-accent-text: #0b0f1a;
  --radius:            12px;
  --radius-lg:         20px;
  --container-max:     1100px;
  --header-bg:         rgba(11, 15, 26, 0.85);

  color-scheme: dark light;
}

/* ── Light mode ────────────────────────────────────────────── */

@media (prefers-color-scheme: light) {
  :root {
    --color-bg:          #f8f9fb;
    --color-surface:     #ffffff;
    --color-surface-2:   #f0f1f4;
    --color-border:      rgba(0, 0, 0, 0.08);
    --color-text:        #3b4252;
    --color-text-dim:    rgba(0, 0, 0, 0.5);
    --color-heading:     #1a1d26;
    --color-accent:      #0284c7;
    --color-accent-hover:#0369a1;
    --color-accent-dim:  rgba(2, 132, 199, 0.1);
    --color-accent-text: #ffffff;
    --header-bg:         rgba(248, 249, 251, 0.85);
  }
}

/* ── Reset & base ──────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Buttons ───────────────────────────────────────────────── */

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 100px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: background 180ms, color 180ms, box-shadow 180ms;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  text-decoration: none;
  box-shadow: 0 4px 20px var(--color-accent-dim);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
  opacity: 0.85;
}
.btn-outline:hover {
  background: var(--color-accent-dim);
  opacity: 1;
  text-decoration: none;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

/* ── Header ────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-heading);
  text-decoration: none;
}
.logo:hover { text-decoration: none; }
.logo-icon { color: var(--color-accent); }

.logo-text {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.header-nav a {
  color: var(--color-text-dim);
  font-size: 14px;
  font-weight: 500;
  transition: color 150ms;
}
.header-nav a:hover {
  color: var(--color-heading);
  text-decoration: none;
}

/* ── Hero ──────────────────────────────────────────────────── */

.hero {
  padding: 80px 0 72px;
  text-align: center;
}

.hero-eyebrow {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 16px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
  color: var(--color-heading);
}

.hero-sub {
  max-width: 640px;
  margin: 0 auto 36px;
  font-size: 18px;
  color: var(--color-text);
  line-height: 1.7;
}

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

/* ── Sections ──────────────────────────────────────────────── */

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-surface);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 12px;
}

.section-header h2 {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--color-heading);
}

.section-sub {
  font-size: 17px;
  color: var(--color-text-dim);
  line-height: 1.65;
  margin: 0;
}

/* ── Feature grid (tracking) ───────────────────────────────── */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 200ms, box-shadow 200ms;
}

.section-alt .feature-card {
  background: var(--color-bg);
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 16px var(--color-accent-dim);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--color-heading);
}

.feature-card p {
  margin: 0;
  font-size: 14.5px;
  color: var(--color-text-dim);
  line-height: 1.6;
}

/* ── Weather grid ──────────────────────────────────────────── */

.weather-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.weather-card {
  display: flex;
  gap: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 200ms;
}
.weather-card:hover {
  border-color: var(--color-accent);
}

.weather-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.weather-icon-radar      { background: rgba(34,197,94,0.12); color: #22c55e; }
.weather-icon-satellite  { background: rgba(168,85,247,0.12); color: #a855f7; }
.weather-icon-turbulence { background: rgba(249,115,22,0.12); color: #f97316; }
.weather-icon-sigmet     { background: rgba(239,68,68,0.12);  color: #ef4444; }
.weather-icon-pirep      { background: rgba(56,189,248,0.12); color: #38bdf8; }
.weather-icon-delays     { background: rgba(234,179,8,0.12);  color: #eab308; }

.weather-card-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--color-heading);
}

.weather-card-body p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-dim);
  line-height: 1.6;
}

/* ── FAQ ───────────────────────────────────────────────────── */

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 200ms;
}

.section-alt .faq-item {
  background: var(--color-bg);
}

.faq-item[open] {
  border-color: var(--color-accent);
}

.faq-question {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-heading);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
  -webkit-user-select: none;
}

.faq-question::-webkit-details-marker { display: none; }

.faq-question::after {
  content: '+';
  font-size: 22px;
  font-weight: 300;
  color: var(--color-text-dim);
  transition: transform 200ms;
  flex-shrink: 0;
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: '−';
  color: var(--color-accent);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
}

.faq-answer p { margin: 0 0 10px; }
.faq-answer p:last-child { margin-bottom: 0; }
.faq-answer ul { margin: 6px 0 10px; padding-left: 20px; }
.faq-answer li { margin: 4px 0; }
.faq-answer code {
  font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 13.5px;
  background: var(--color-accent-dim);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ── Install ───────────────────────────────────────────────── */

.install-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 760px;
  margin: 0 auto;
}

.install-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.install-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 14px;
  color: var(--color-heading);
}
.install-card h3 svg { color: var(--color-accent); }

.install-card p {
  margin: 8px 0 0;
  font-size: 15px;
  color: var(--color-text-dim);
}

.install-card pre {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 14px 18px;
  overflow-x: auto;
  margin: 12px 0 0;
}

.install-card code {
  font-family: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 13.5px;
  color: var(--color-accent);
  line-height: 1.7;
}

/* ── Footer ────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-inner p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-dim);
}

.footer-nav {
  display: flex;
  gap: 24px;
}

.footer-nav a {
  font-size: 14px;
  color: var(--color-text-dim);
}
.footer-nav a:hover { color: var(--color-accent); }

/* ── Mobile nav toggle ─────────────────────────────────────── */

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-dim);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: background 150ms;
}
.nav-toggle:hover {
  background: var(--color-accent-dim);
}

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; align-items: center; }

  .header-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--header-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 8px;
    z-index: 99;
  }
  .header-nav.open { display: flex; }
  .header-nav a {
    color: var(--color-text);
    font-size: 16px;
    padding: 10px 0;
  }

  .hero { padding: 48px 0 40px; }
  .hero-actions { flex-direction: column; align-items: center; }

  .section { padding: 56px 0; }

  .feature-grid { grid-template-columns: 1fr; }
  .weather-grid { grid-template-columns: 1fr; }
  .install-grid { grid-template-columns: 1fr; }

  .weather-card { flex-direction: column; gap: 14px; }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}