/* ── Reset & tokens ───────────────────────────────────── */
:root {
  --bg:      #eef4f8;
  --card:    #ffffff;
  --border:  #d0dde6;
  --text:    #1a2b36;
  --muted:   #5a7282;
  --accent:  #0b6b8a;
  --accent2: #0d8fab;
  --shadow:  0 2px 10px rgba(0,0,0,.09);
  --radius:  10px;
}

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

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Header ───────────────────────────────────────────── */
.site-header {
  background: linear-gradient(135deg, #05415a 0%, #0b7fa3 100%);
  color: #fff;
  padding: 1.1rem 1.5rem;
}
.site-header h1 { font-size: 1.35rem; font-weight: 700; letter-spacing: .02em; }
.site-header p  { font-size: .85rem; opacity: .8; margin-top: .2rem; }

/* ── Main layout ──────────────────────────────────────── */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.2rem 1rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ── Cards ────────────────────────────────────────────── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* ── Status message ───────────────────────────────────── */
.status-msg {
  color: var(--muted);
  font-size: .9rem;
  padding: .4rem 0;
}

/* ── Ship quick-select cards ──────────────────────────── */
.ship-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: .75rem;
}

.ship-cards.compact {
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: .5rem;
}

.ship-cards.compact .ship-card {
  padding: .5rem .65rem;
  font-size: .85em;
}

.ship-cards.compact .ship-name { font-size: .8rem; }
.ship-cards.compact .ship-pos  { font-size: .68rem; }
.ship-cards.compact .ship-metrics { font-size: .72rem; }

.ship-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: .85rem 1rem;
  cursor: pointer;
  border-left: 4px solid var(--border);
  transition: transform .15s, box-shadow .15s;
}
.ship-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,.13);
}
.ship-card.active {
  border-left-color: var(--accent2);
  background: #f0fafd;
}

/* ── Observation group accordions ─────────────────────── */
.obs-group {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.obs-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1rem;
  background: none;
  border: none;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .07em;
  text-align: left;
  transition: background 0.15s;
}
.obs-toggle:hover { background: #f5f9fc; }
.obs-group.collapsed .obs-toggle { border-bottom-color: transparent; }
.obs-toggle::before {
  content: "▾";
  font-size: 1.05rem;
  line-height: 1;
  color: var(--accent);
  display: inline-block;
  transition: transform 0.22s ease;
  flex-shrink: 0;
}
.obs-group.collapsed .obs-toggle::before { transform: rotate(-90deg); }
.obs-badge {
  margin-left: auto;
  background: var(--accent);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  min-width: 1.6rem;
  text-align: center;
  letter-spacing: 0;
  text-transform: none;
}
.obs-body {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.28s ease;
}
.obs-group.collapsed .obs-body {
  grid-template-rows: 0fr;
}
.obs-body-inner {
  overflow: hidden;
  padding: 0.85rem 1rem 1rem;
}
.obs-tag {
  font-size: 0.62rem;
  font-weight: 700;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  vertical-align: middle;
  margin-left: 0.3rem;
}
.ship-tag         { background: #e8f4fd; color: #0b6b8a; }
.simba-tag        { background: #fef3e2; color: #c0640a; }
.thermistor-tag   { background: #eaf6ee; color: #1a7a3a; }
.arctsum-tag      { background: #f0ebfa; color: #6c3c9e; }
.svalmiz-tag      { background: #fdf0ea; color: #9e4c1a; }
.iabp-tag         { background: #e6f4ee; color: #155e35; }
.svalbard-tag     { background: #e6ecf7; color: #0b3e75; }
.north-norway-tag { background: #f9e8e8; color: #7a1515; }
.offshore-tag     { background: #faf3e0; color: #5c3d00; }

/* ── Land-stations section (parent collapsible) ───────── */
.section-group {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.section-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.9rem 1rem;
  background: #edf1f8;
  border: none;
  border-bottom: 2px solid #c8d4e8;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: #1a2a4a;
  text-transform: uppercase;
  letter-spacing: .07em;
  text-align: left;
  transition: background 0.15s;
}
.section-toggle:hover { background: #e0e8f4; }
.section-group.collapsed .section-toggle { border-bottom-color: transparent; }
.section-toggle::before {
  content: "▾";
  font-size: 1.1rem;
  line-height: 1;
  color: var(--accent);
  display: inline-block;
  transition: transform 0.22s ease;
  flex-shrink: 0;
}
.section-group.collapsed .section-toggle::before { transform: rotate(-90deg); }
.section-badge {
  margin-left: auto;
  background: var(--accent);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  min-width: 1.6rem;
  text-align: center;
  letter-spacing: 0;
  text-transform: none;
}
.section-body {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.28s ease;
}
.section-group.collapsed .section-body {
  grid-template-rows: 0fr;
}
.section-body-inner {
  overflow: hidden;
  padding: 0.6rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.greenland-tag    { background: #e8f4ee; color: #1a5c38; }
.canada-tag       { background: #fce8eb; color: #c41230; }
.alaska-tag       { background: #fff3e0; color: #b35c00; }
.russia-tag       { background: #fce8e8; color: #8b0000; }
.iceland-tag      { background: #e8f0fa; color: #1a3f7a; }
.finland-tag      { background: #e6f0ff; color: #003580; }
.sweden-tag       { background: #fef9e0; color: #8a6900; }
.norway-buoys-tag { background: #f0e8fa; color: #5b1fa3; }

.ship-card .ship-name {
  font-weight: 600;
  font-size: .95rem;
  margin-bottom: .3rem;
}
.ship-card .ship-pos {
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: .4rem;
}
.ship-card .ship-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .6rem;
  font-size: .82rem;
  font-weight: 500;
  color: var(--accent);
}

/* ── Click hint ──────────────────────────────────────── */
.click-hint {
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
  padding: .55rem 1rem;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 3px solid var(--accent2);
  opacity: 1;
  transition: opacity 0.5s ease;
}
.click-hint.hidden { opacity: 0; pointer-events: none; }

/* ── Detail subfigure ─────────────────────────────────── */
.detail-card {
  border-top: 3px solid var(--accent2);
}
.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .3rem;
  padding: .75rem 1rem .25rem;
  border-bottom: 1px solid var(--border);
}
#detail-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
}
#detail-meta {
  font-size: .8rem;
  color: var(--muted);
}
#plot-container {
  width: 100%;
  min-height: 500px;
}
#map-container {
  width: 100%;
  height: 800px;
}
.graticule-label {
  font-size: 10px;
  color: #666;
  background: none;
  border: none;
  text-align: center;
  white-space: nowrap;
}

/* ── Time range slider ────────────────────────────────── */
#time-slider-box {
  padding: .6rem 1rem .8rem;
}
.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: .75rem;
  color: var(--muted);
  margin-bottom: .25rem;
}
#slider-range-label { font-weight: 700; color: var(--accent); }
.dual-slider {
  position: relative;
  height: 24px;
}
.dual-slider input[type=range] {
  position: absolute;
  width: 100%;
  pointer-events: none;
  appearance: none;
  -webkit-appearance: none;
  background: none;
  top: 0; left: 0;
  height: 24px;
  margin: 0;
}
.dual-slider input[type=range]::-webkit-slider-runnable-track {
  height: 4px;
  background: #d0dde6;
  border-radius: 2px;
}
.dual-slider input[type=range]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  pointer-events: auto;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.25);
  margin-top: -6px;
  cursor: pointer;
}
.dual-slider input[type=range]::-moz-range-track {
  height: 4px;
  background: #d0dde6;
  border-radius: 2px;
  border: none;
}
.dual-slider input[type=range]::-moz-range-thumb {
  pointer-events: auto;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.25);
  cursor: pointer;
}

/* ── Traffic-light data-quality dot ───────────────────── */
.data-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-right: .35rem;
  vertical-align: middle;
  flex-shrink: 0;
}
.data-dot.green  { background: #27ae60; animation: blink-green 1.4s ease-in-out infinite; }
.data-dot.grey   { background: #bdc3c7; }
@keyframes blink-green {
  0%, 100% { opacity: 1; }
  50%      { opacity: .25; }
}