/* ── Reset & Base ────────────────────────────────────── */

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

:root {
  color-scheme: light dark;

  --green: #16a34a;
  --green-bg: rgba(22, 163, 74, 0.08);
  --green-border: rgba(22, 163, 74, 0.25);
  --yellow: #a16207;
  --yellow-bg: rgba(234, 179, 8, 0.08);
  --yellow-border: rgba(234, 179, 8, 0.25);
  --red: #dc2626;
  --red-bg: rgba(239, 68, 68, 0.08);
  --red-border: rgba(239, 68, 68, 0.25);
  --cyan: #0891b2;

  --bg: #ffffff;
  --bg-card: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-dim: #94a3b8;
  --border: #e2e8f0;

  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', ui-monospace, 'Cascadia Code', monospace;

  --radius: 8px;
  --radius-lg: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --green: #22c55e;
    --green-bg: rgba(22, 163, 74, 0.12);
    --green-border: rgba(22, 163, 74, 0.3);
    --yellow: #eab308;
    --yellow-bg: rgba(234, 179, 8, 0.12);
    --yellow-border: rgba(234, 179, 8, 0.3);
    --red: #f87171;
    --red-bg: rgba(239, 68, 68, 0.12);
    --red-border: rgba(239, 68, 68, 0.3);
    --cyan: #22d3ee;

    --bg: #0c1222;
    --bg-card: #162032;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;
    --border: #1e293b;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

body.settings-open {
  overflow: hidden;
}

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

.app-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0.75rem 1.5rem;
  padding-left: max(1.5rem, env(safe-area-inset-left));
  padding-right: max(1.5rem, env(safe-area-inset-right));
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.logo-img {
  height: 2.75rem;
  width: auto;
  display: block;
}

.header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
}

.airport-input input {
  width: 5.5rem;
  padding: 0.3rem 0.5rem;
  border: none;
  border-bottom: 2px solid var(--cyan);
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  text-transform: uppercase;
  text-align: center;
  letter-spacing: 0.04em;
}

.airport-input {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.airport-input input:focus {
  outline: none;
  border-bottom-color: var(--text);
}

.locate-btn {
  border: none;
  background: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.2rem;
  line-height: 1;
}

.locate-btn:hover { color: var(--cyan); }
.locate-btn.locating { animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: 0.4; } }

#settings-airport {
  text-transform: uppercase;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
}

#refresh-btn,
#settings-toggle,
.header-btn {
  padding: 0.4rem 0.6rem;
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
  touch-action: manipulation;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-weight: 700;
}

#refresh-btn:hover,
#settings-toggle:hover,
.header-btn:hover {
  background: var(--bg-tertiary);
}

/* ── Main ────────────────────────────────────────────── */

main {
  flex: 1;
  max-width: 52rem;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  padding-left: max(1.5rem, env(safe-area-inset-left));
  padding-right: max(1.5rem, env(safe-area-inset-right));
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Loading ─────────────────────────────────────────── */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 3rem;
  color: var(--text-dim);
}

.spinner {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--border);
  border-top-color: var(--cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Error ───────────────────────────────────────────── */

.error-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  background: var(--red-bg);
  border: 1px solid var(--red-border);
  color: var(--red);
  font-size: 0.9rem;
}

/* ── Status Card ─────────────────────────────────────── */

.status-block {
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  text-align: center;
}

.status-block[data-status="GREEN"] {
  background: var(--green-bg);
  border: 2px solid var(--green-border);
}
.status-block[data-status="YELLOW"] {
  background: var(--yellow-bg);
  border: 2px solid var(--yellow-border);
}
.status-block[data-status="RED"] {
  background: var(--red-bg);
  border: 2px solid var(--red-border);
}

.status-label {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.status-block[data-status="GREEN"] .status-label { color: var(--green); }
.status-block[data-status="YELLOW"] .status-label { color: var(--yellow); }
.status-block[data-status="RED"] .status-label { color: var(--red); }

.status-temps {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 0.5rem;
}

.temp-group {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.temp-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.temp-value {
  font-size: 1.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.status-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.status-meta:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.frost-warning {
  margin-top: 0.5rem;
  color: var(--cyan);
  font-weight: 600;
  font-size: 0.9rem;
}

.next-safe {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.next-safe strong { color: var(--text); }

/* ── Time Nav ────────────────────────────────────────── */

.time-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.time-nav-btn {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.8rem;
  line-height: 1;
  touch-action: manipulation;
}

.time-nav-btn:hover { background: var(--bg-tertiary); }

.time-nav-label {
  padding: 0.25rem 0.75rem;
  border: none;
  border-radius: var(--radius);
  background: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  min-width: 8rem;
  text-align: center;
}

.time-nav-label:hover { color: var(--text-secondary); }

.time-nav-label.active {
  background: var(--bg-tertiary);
  color: var(--text);
}

/* ── Chart ───────────────────────────────────────────── */

.chart-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
}

.chart-wrap {
  position: relative;
  height: 280px;
}

/* ── Forecast Table ──────────────────────────────────── */

.forecast-section h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

#forecast-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: nowrap;
}

#forecast-table th {
  text-align: left;
  padding: 0.4rem 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  border-bottom: 2px solid var(--border);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#forecast-table td {
  padding: 0.3rem 0.75rem;
}

#forecast-table .date-header td {
  padding: 0.75rem 0.75rem 0.25rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 600;
  font-family: var(--font-sans);
}

#forecast-table .history td {
  opacity: 0.4;
}

#forecast-table .now-row td {
  font-weight: 700;
  background: var(--bg-tertiary);
}

#forecast-table .night .time-cell {
  opacity: 0.5;
}

.status-dot {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  vertical-align: middle;
  margin-right: 0.3rem;
}

.status-dot[data-status="GREEN"] { background: var(--green); }
.status-dot[data-status="YELLOW"] { background: var(--yellow); }
.status-dot[data-status="RED"] { background: var(--red); }

.frost-tag {
  color: var(--cyan);
  font-size: 0.8rem;
  margin-left: 0.5rem;
}

.legend {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.now-marker {
  font-weight: 700;
  margin-left: 0.5rem;
  font-size: 0.75rem;
  opacity: 0.7;
}

/* ── METAR ───────────────────────────────────────────── */

.metar-section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.85rem;
}

.metar-label {
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
}

.metar-section pre {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
}

.metar-decoded {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.metar-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--bg-tertiary);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  white-space: nowrap;
}

.metar-cat-VFR { background: var(--green-bg); color: var(--green); border: 1px solid var(--green-border); }
.metar-cat-MVFR { background: rgba(59, 130, 246, 0.1); color: #3b82f6; border: 1px solid rgba(59, 130, 246, 0.25); }
.metar-cat-IFR { background: var(--red-bg); color: var(--red); border: 1px solid var(--red-border); }
.metar-cat-LIFR { background: rgba(168, 85, 247, 0.1); color: #a855f7; border: 1px solid rgba(168, 85, 247, 0.25); }

.metar-age {
  color: var(--text-dim);
}

/* ── Settings Panel ──────────────────────────────────── */

.settings-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 26rem;
  max-width: 90vw;
  height: 100vh;
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.2s ease;
}

.settings-panel.open {
  transform: translateX(0);
}

.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.settings-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

.settings-header h2 {
  font-size: 1rem;
}

.settings-header button {
  border: none;
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 0.25rem;
}

.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.setting {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.setting > span {
  color: var(--text-secondary);
  flex-shrink: 0;
}

.setting select,
.setting input[type="number"] {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  max-width: 10rem;
}

.range-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.range-group input[type="range"] {
  width: 7rem;
}

.range-group output {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  width: 2rem;
  text-align: right;
}

.setting input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--cyan);
}

.advanced-settings {
  margin-top: 0.25rem;
}

.advanced-settings summary {
  font-size: 0.8rem;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.25rem 0;
}

.advanced-settings .setting {
  margin-top: 0.5rem;
}

.settings-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.btn {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  cursor: pointer;
  font-size: 0.8rem;
  flex: 1;
  text-align: center;
}

.btn:hover { background: var(--bg-tertiary); }
.btn-secondary { color: var(--text-dim); }

/* ── Disclaimer ─────────────────────────────────────── */

.disclaimer {
  max-width: 52rem;
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem 1rem;
  padding-left: max(1.5rem, env(safe-area-inset-left));
  padding-right: max(1.5rem, env(safe-area-inset-right));
}

.disclaimer p {
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--text-dim);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
}

.disclaimer strong {
  color: var(--text-secondary);
}

.disclaimer a {
  color: var(--text-dim);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.disclaimer a:hover {
  color: var(--text-secondary);
}

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

.app-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 1rem;
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}

.footer-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.footer-row:last-child {
  font-size: 0.65rem;
  opacity: 0.7;
}

.footer-link {
  color: var(--text-dim);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-link:hover {
  color: var(--text-secondary);
}

/* ── How It Works ────────────────────────────────────── */

.how-main {
  max-width: 52rem;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  padding-left: max(1.5rem, env(safe-area-inset-left));
  padding-right: max(1.5rem, env(safe-area-inset-right));
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.how-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.how-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

.how-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 0.5rem;
}

.how-section p {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.8;
}

.how-section ul,
.how-section ol {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.8;
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.how-section li strong {
  color: var(--text);
}

.formula-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.9;
  overflow-x: auto;
}

.formula-block .comment {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th {
  text-align: left;
  padding: 0.4rem 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  border-bottom: 2px solid var(--border);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-sans);
}

.data-table td {
  padding: 0.35rem 0.75rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table td:first-child {
  color: var(--text);
  font-weight: 600;
}

.table-wrap-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.callout {
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text);
}

.callout.info {
  background: rgba(8, 145, 178, 0.06);
  border: 1px solid rgba(8, 145, 178, 0.2);
}

.callout.warn {
  background: var(--yellow-bg);
  border: 1px solid var(--yellow-border);
}

.callout strong {
  color: var(--text);
}

.badge-green { color: var(--green); font-weight: 700; }
.badge-yellow { color: var(--yellow); font-weight: 700; }
.badge-red { color: var(--red); font-weight: 700; }

.how-hero {
  width: 100%;
  border-radius: var(--radius-lg);
}

.how-intro {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.8;
  padding-bottom: 0.5rem;
}

.logo-link {
  text-decoration: none;
  color: var(--text);
}

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

.how-header {
  display: flex;
  justify-content: space-between;
}

.how-back-link {
  text-decoration: none;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.how-back-link:hover {
  color: var(--text);
}

/* ── Utilities ───────────────────────────────────────── */

.hidden { display: none !important; }

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

@media (max-width: 640px) {
  main {
    padding: 1rem;
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
    gap: 1rem;
  }
  .app-header {
    padding: 0.5rem 1rem;
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
  .logo-img { height: 2.25rem; }
  .airport-input input { width: 4.5rem; font-size: 1rem; }
  .header-right { gap: 0.25rem; }
  #refresh-btn,
  #settings-toggle,
  .header-btn {
    min-width: 2.25rem;
    min-height: 2.25rem;
    font-size: 1.1rem;
    padding: 0.25rem 0.4rem;
  }
  .status-temps { gap: 1.5rem; }
  .temp-value { font-size: 1.5rem; }
  .chart-wrap { height: 220px; }
  #forecast-table { font-size: 0.78rem; }
  #forecast-table td { padding: 0.25rem 0.4rem; }
  #forecast-table th { padding: 0.3rem 0.4rem; }
  .frost-text { display: none; }
  .now-marker { margin-left: 0.25rem; }
  .how-main {
    padding: 1.25rem 1rem;
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
    gap: 2rem;
  }
  .legend {
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
  }
  .footer-row {
    display: block;
    text-align: center;
  }
  .formula-block { font-size: 0.78rem; }
  .data-table { font-size: 0.78rem; }
}

/* ── Print ───────────────────────────────────────────── */

@media print {
  .app-header, .app-footer, .settings-panel, .settings-overlay,
  #settings-toggle, #refresh-btn { display: none !important; }
  main { max-width: none; padding: 0; }
  .status-card, .chart-section, .forecast-section { break-inside: avoid; }
}