:root {
  --bg-top: #f3eadf;
  --bg-bottom: #dfeaf4;
  --ink: #1f2f3d;
  --ink-soft: #425869;
  --panel: #fefdf8;
  --panel-alt: #f4f8fb;
  --line: #cddbe7;
  --accent: #0e7490;
  --accent-strong: #0c4a6e;
  --chip: #edf5fb;
  --chip-active: #0c4a6e;
  --chip-active-text: #f5fbff;
  --warn: #9a3412;
  font-family: 'Source Sans 3', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 10% 0%, #fff4e2 0%, transparent 35%),
    radial-gradient(circle at 90% 10%, #d3ecff 0%, transparent 32%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  min-height: 100vh;
}

.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1rem 0.3rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: 'Sora', sans-serif;
}

h1 {
  margin-top: 0.25rem;
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
}

.hero > p {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
}

.mode-nav {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.tab-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.7rem 1rem;
  font-weight: 700;
  cursor: pointer;
}

.tab-btn.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #f8fdff;
  border-color: transparent;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.7rem 1rem 1rem;
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.panel-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), var(--panel-alt));
  border-radius: 18px;
  padding: 1rem;
  box-shadow: 0 10px 30px rgb(41 74 100 / 10%);
}

.map-panel {
  display: grid;
  gap: 0.75rem;
}

.map-panel > p,
.controls > p,
#meta p,
.timeline p {
  margin: 0;
}

#map {
  width: 100%;
  min-height: 470px;
  border-radius: 16px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.timeline {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem;
  background: #fff;
  display: grid;
  gap: 0.65rem;
}

.image-link {
  display: block;
}

#timelineImage {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 12px;
  background: #e6f0f6;
  border: 1px solid var(--line);
}

.timepicker-controls {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.45rem;
  align-items: center;
}

.nav-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 999px;
  height: 2.1rem;
  min-width: 2.1rem;
  cursor: pointer;
}

.nav-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.timepicker {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
  scrollbar-width: thin;
}

.time-chip {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.72rem;
  background: var(--chip);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

.time-chip.is-active {
  background: var(--chip-active);
  color: var(--chip-active-text);
  border-color: transparent;
}

.step {
  color: var(--ink-soft);
  font-weight: 600;
}

.source-link {
  color: var(--accent-strong);
  font-weight: 700;
  text-underline-offset: 2px;
}

.camera-layout {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
  align-items: start;
}

.viewer {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 16;
  background: #060d14;
  overflow: hidden;
  padding: 0;
}

#camera,
#overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#camera {
  object-fit: cover;
}

#overlay {
  object-fit: contain;
  opacity: 0.55;
  mix-blend-mode: screen;
}

.controls {
  display: grid;
  gap: 0.75rem;
}

#startBtn {
  border: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #f7fcff;
  padding: 0.78rem 0.9rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.opacity-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
}

#opacity {
  width: 100%;
}

#status {
  color: var(--warn);
  font-weight: 700;
}

@media (max-width: 840px) {
  .camera-layout {
    grid-template-columns: 1fr;
  }

  #map {
    min-height: 360px;
  }
}