/* ==========================================================================
   EarthPulse -- design system
   ==========================================================================
   Grounded in the actual visual vernacular of seismology and cartography
   rather than generic dashboard defaults:
   - The magnitude/severity scale is a topographic elevation-banding
     gradient (green -> amber -> rust -> deep red), the same device
     survey maps use for low-to-high terrain, repurposed so color always
     encodes real information.
   - Layout reads like an instrument panel / field report: left-aligned,
     hairline dividers instead of boxed cards, a dense real data table.
   - The one deliberate animation is the live-status pulse -- literally
     the product's namesake -- everything else is still.
   ========================================================================== */

:root {
  /* Surfaces */
  --depth-900: #12161d;
  --depth-800: #1a2029;
  --depth-700: #232a35;
  --hairline: #2b3340;

  /* Text */
  --ink: #e7ebef;
  --ink-muted: #9ba5b4;
  --ink-dim: #838c9b;

  /* Signal -- the single functional "live" accent */
  --signal: #4fd8c4;
  --signal-dim: rgba(79, 216, 196, 0.14);

  /* Magnitude / severity scale -- elevation-banding, low to high */
  --band-1: #7dd5a8;
  --band-2: #c9d571;
  --band-3: #e8c468;
  --band-4: #e3914f;
  --band-5: #d2603f;
  --band-6: #b33a3a;

  --font-display: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;

  --container: 1180px;
  --radius: 4px;
}

/* ---------- Reset & base ---------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--depth-900);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.15;
  margin: 0;
}

p {
  margin: 0;
}

a {
  color: var(--signal);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img,
svg {
  display: block;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(18, 22, 29, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink);
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
}

.brand-icon {
  font-size: 1.25rem;
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 0 var(--signal-dim);
  animation: pulse 2.4s ease-in-out infinite;
  flex-shrink: 0;
}

.pulse-dot.dot-pending {
  background: var(--ink-dim);
  animation: none;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(79, 216, 196, 0.45);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(79, 216, 196, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(79, 216, 196, 0);
  }
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.site-nav a {
  color: var(--ink-muted);
}

.site-nav a:hover {
  color: var(--ink);
  text-decoration: none;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ---------- Banners ---------- */
.sync-banner,
.significant-banner {
  border-bottom: 1px solid var(--hairline);
  font-size: 0.9rem;
  padding: 0.7rem 0;
}

.sync-banner {
  background: var(--depth-800);
  color: var(--ink-muted);
}

.sync-banner a {
  margin-left: 0.3rem;
}

.significant-banner {
  background: rgba(179, 58, 58, 0.14);
  border-bottom-color: rgba(179, 58, 58, 0.35);
  color: var(--ink);
}

.significant-banner .container,
.sync-banner .container {
  padding-top: 0;
  padding-bottom: 0;
}

/* ---------- Hero / stats strip ---------- */
.hero {
  padding: 3rem 1.5rem 2.5rem;
}

.hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  max-width: 42ch;
  color: var(--ink);
}

.hero-sub {
  margin-top: 0.75rem;
  max-width: 60ch;
  color: var(--ink-muted);
  font-size: 1rem;
}

.stats-grid {
  margin-top: 2.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  border-top: 1px solid var(--hairline);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.25rem 1.5rem 1.25rem 0;
  border-right: 1px solid var(--hairline);
}

.stat:last-child {
  border-right: none;
}

.stat-value {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  font-weight: 500;
  color: var(--ink);
}

.stat-label {
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.stat-sub {
  color: var(--ink-dim);
  font-size: 0.8rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- Panels ---------- */
.panel {
  padding: 3rem 1.5rem;
  border-top: 1px solid var(--hairline);
}

.panel-header {
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
}

.panel-header h2 {
  font-size: 1.4rem;
  color: var(--ink);
}

.panel-sub {
  color: var(--ink-muted);
  font-size: 0.9rem;
}

/* ---------- Map ---------- */
.map-container {
  height: 460px;
  width: 100%;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--depth-800);
}

.map-legend {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.map-popup {
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.5;
}

.popup-tsunami {
  color: var(--band-5);
}

/* Leaflet ships its own control styling; only override what needs to sit
   on a dark surface without looking out of place. */
.leaflet-popup-content-wrapper,
.leaflet-popup-tip {
  background: var(--depth-700);
  color: var(--ink);
}

.leaflet-popup-content-wrapper {
  border-radius: var(--radius);
}

.leaflet-container a.leaflet-popup-close-button {
  color: var(--ink-muted);
}

/* ---------- Charts ---------- */
.charts-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.chart-card h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 1rem;
}

.chart-card .muted {
  color: var(--ink-dim);
  font-weight: 400;
  font-family: var(--font-body);
  font-size: 0.85rem;
}

.chart-card canvas {
  max-height: 240px;
}

/* ---------- Table ---------- */
.table-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.table-controls input,
.table-controls select {
  background: var(--depth-800);
  border: 1px solid var(--hairline);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 0.55rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
}

.table-controls input {
  flex: 1;
  min-width: 200px;
}

.table-controls input::placeholder {
  color: var(--ink-dim);
}

.table-wrapper {
  overflow-x: auto;
  border-top: 1px solid var(--hairline);
}

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

thead th {
  text-align: left;
  color: var(--ink-dim);
  font-weight: 400;
  font-size: 0.8rem;
  padding: 0.75rem 0.75rem 0.75rem 0;
  border-bottom: 1px solid var(--hairline);
  white-space: nowrap;
}

tbody td {
  padding: 0.75rem 0.75rem 0.75rem 0;
  border-bottom: 1px solid var(--hairline);
  vertical-align: middle;
}

tbody tr:last-child td {
  border-bottom: none;
}

.mag-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.85rem;
}

.table-link-cell a {
  display: inline-flex;
  color: var(--ink-muted);
}

.table-link-cell a:hover {
  color: var(--signal);
}

.empty-row {
  color: var(--ink-dim);
  text-align: left;
  padding: 1.5rem 0;
}

/* ---------- Alerts ---------- */
.severity-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.severity-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid;
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.severity-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.alert-list {
  display: flex;
  flex-direction: column;
}

.alert-item {
  display: flex;
  gap: 1rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--hairline);
}

.alert-item:first-child {
  border-top: none;
}

.alert-severity {
  flex-shrink: 0;
  height: fit-content;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 600;
}

.alert-body strong {
  display: block;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 500;
}

.alert-body p {
  margin-top: 0.2rem;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.empty-state {
  color: var(--ink-muted);
  font-size: 0.92rem;
}

/* ---------- Safety ---------- */
.safety-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.safety-card {
  padding: 1.5rem;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.safety-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.safety-card p {
  color: var(--ink-muted);
  font-size: 0.9rem;
  max-width: 42ch;
}

.disclaimer {
  margin-top: 1.75rem;
  color: var(--ink-dim);
  font-size: 0.85rem;
  max-width: 65ch;
}

/* ---------- About / how it works ---------- */
.about-panel p {
  color: var(--ink-muted);
  max-width: 68ch;
  margin-bottom: 1.5rem;
}

.about-panel a {
  color: var(--signal);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin: 1.75rem 0;
}

.step {
  display: flex;
  gap: 0.85rem;
}

.step-number {
  font-family: var(--font-display);
  color: var(--signal);
  font-size: 0.95rem;
  flex-shrink: 0;
}

.step-body h3 {
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

.step-body p {
  color: var(--ink-muted);
  font-size: 0.85rem;
  max-width: 32ch;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 2rem 1.5rem;
  color: var(--ink-dim);
  font-size: 0.85rem;
}

.site-footer p + p {
  margin-top: 0.4rem;
}

.site-footer a {
  color: var(--ink-muted);
}

.site-footer a:hover {
  color: var(--signal);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .site-nav {
    gap: 1rem;
  }
  .site-nav a:not(.github-link) {
    display: none;
  }
  .charts-panel {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat {
    border-right: 1px solid var(--hairline);
  }
  .stat:nth-child(2n) {
    border-right: none;
  }
}

@media (max-width: 560px) {
  .header-inner {
    gap: 0.75rem;
  }
  .live-indicator span:last-child {
    display: none;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  .map-container {
    height: 320px;
  }
}