/* =========================================================
   4th Field Squadron RE — Campaign Map
   Design system: "Ops Room Dossier" — sand/parchment desert
   map by day, blacked-out ops room by night. Stencil display
   type, archival serif body, mono for dates/coordinates.
   ========================================================= */

:root,
[data-theme='light'] {
  /* Surfaces — warm parchment / sand table */
  --color-bg: #ece1c8;
  --color-surface: #f4ecd9;
  --color-surface-2: #f8f2e4;
  --color-surface-offset: #e3d5b3;
  --color-surface-offset-2: #d9c89b;
  --color-divider: #cdb98a;
  --color-border: #c2ab79;

  /* Text — dark ink brown */
  --color-text: #2a2013;
  --color-text-muted: #6b5c40;
  --color-text-faint: #9c8b63;
  --color-text-inverse: #f6efdb;

  /* Primary accent — olive drab */
  --color-primary: #52581c;
  --color-primary-hover: #3c4114;
  --color-primary-active: #2c300e;
  --color-primary-highlight: #d8d6b3;

  /* Category colors */
  --cat-advance: #a04b2a;
  --cat-retreat: #93650a;
  --cat-defence: #7a1f2b;
  --cat-supply: #1f4e5f;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.05 80 / 0.12);
  --shadow-md: 0 6px 16px oklch(0.2 0.05 80 / 0.18);
  --shadow-lg: 0 16px 40px oklch(0.15 0.05 80 / 0.28);

  --font-display: 'Big Shoulders Display', 'Arial Narrow', sans-serif;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --map-filter: sepia(0.35) saturate(1.25) hue-rotate(-6deg) brightness(1.03) contrast(1.03);
}

[data-theme='dark'] {
  --color-bg: #14130e;
  --color-surface: #1b1912;
  --color-surface-2: #211f16;
  --color-surface-offset: #262316;
  --color-surface-offset-2: #302c1a;
  --color-divider: #38331e;
  --color-border: #453f24;

  --color-text: #e9dfc2;
  --color-text-muted: #ab9c76;
  --color-text-faint: #756a4c;
  --color-text-inverse: #201e15;

  --color-primary: #9aa15a;
  --color-primary-hover: #b7bd7c;
  --color-primary-active: #cdd199;
  --color-primary-highlight: #3a3d24;

  --cat-advance: #e08a5f;
  --cat-retreat: #e0ac3d;
  --cat-defence: #d76b78;
  --cat-supply: #5fa8c2;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.4);
  --shadow-md: 0 6px 16px oklch(0 0 0 / 0.5);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.6);

  --map-filter: sepia(0.25) saturate(0.7) hue-rotate(-6deg) brightness(0.55) contrast(1.15) invert(0.92);
}

/* Type scale */
:root {
  --text-xs: clamp(0.72rem, 0.68rem + 0.2vw, 0.8rem);
  --text-sm: clamp(0.82rem, 0.78rem + 0.25vw, 0.92rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --text-lg: clamp(1.08rem, 1rem + 0.5vw, 1.3rem);
  --text-xl: clamp(1.35rem, 1.15rem + 1vw, 1.9rem);
  --text-2xl: clamp(1.8rem, 1.3rem + 2vw, 2.8rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
}

/* ============ App shell ============ */
.app {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

#map {
  position: absolute;
  inset: 0;
  filter: var(--map-filter);
}

/* ============ Header ============ */
.header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  background: linear-gradient(
    to bottom,
    oklch(from var(--color-bg) l c h / 0.96),
    oklch(from var(--color-bg) l c h / 0.75)
  );
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.header__logo {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  color: var(--color-primary);
}

.header__titles {
  min-width: 0;
}

.header__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header__subtitle {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}
.icon-btn:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-primary);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
}

.header__menu-toggle {
  display: none;
}

/* ============ Legend / filter chips ============ */
.legend {
  position: absolute;
  top: calc(var(--space-3) + 56px);
  left: var(--space-5);
  z-index: 35;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  max-width: min(560px, calc(100vw - 2 * var(--space-5)));
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: oklch(from var(--color-surface) l c h / 0.92);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  box-shadow: var(--shadow-sm);
}
.chip:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
}
.chip[aria-pressed='true'] {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}
.chip__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============ Timeline rail (bottom) ============ */
.timeline-wrap {
  position: absolute;
  left: var(--space-5);
  right: var(--space-5);
  bottom: var(--space-8);
  z-index: 35;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.timeline-arrow {
  flex-shrink: 0;
  display: none;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}
@media (min-width: 640px) {
  .timeline-arrow {
    display: inline-flex;
  }
}
.timeline-arrow:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.timeline-arrow svg {
  width: 16px;
  height: 16px;
}

.timeline {
  flex: 1;
  min-width: 0;
}

.timeline-wrap {
  --fade-w: 36px;
}
.timeline-wrap::before,
.timeline-wrap::after {
  content: '';
  position: absolute;
  top: 1px;
  bottom: 1px;
  width: var(--fade-w);
  z-index: 1;
  pointer-events: none;
  border-radius: var(--radius-lg);
}
.timeline-wrap::before {
  left: 42px;
  background: linear-gradient(to right, oklch(from var(--color-surface) l c h / 0.98), transparent);
}
.timeline-wrap::after {
  right: 42px;
  background: linear-gradient(to left, oklch(from var(--color-surface) l c h / 0.98), transparent);
}
@media (max-width: 639px) {
  .timeline-wrap::before,
  .timeline-wrap::after {
    left: 0;
    right: 0;
  }
}

.timeline {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: var(--space-3);
  background: oklch(from var(--color-surface) l c h / 0.94);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  scrollbar-width: thin;
}

.timeline::-webkit-scrollbar {
  height: 6px;
}
.timeline::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.timeline-item {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  border-left: 3px solid var(--item-color, var(--color-primary));
  background: var(--color-surface-2);
  width: 172px;
  scroll-snap-align: start;
  text-align: left;
}
.timeline-item:hover {
  background: var(--color-surface-offset);
}
.timeline-item[aria-current='true'] {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.timeline-item__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.timeline-item__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.timeline-item__title {
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.25;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============ Sidebar (info panel) ============ */
.sidebar {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  width: min(440px, 100vw);
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 320ms cubic-bezier(0.16, 1, 0.3, 1);
}
.sidebar[data-open='true'] {
  transform: translateX(0);
}

.sidebar__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}

.sidebar__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.sidebar__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 3px var(--space-2);
  border-radius: var(--radius-full);
  color: #fff;
  font-weight: 600;
}

.sidebar__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.15;
}

.sidebar__place {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.sidebar__close {
  flex-shrink: 0;
}

.sidebar__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.sidebar__section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.sidebar__section-label::before {
  content: '';
  width: 14px;
  height: 1px;
  background: var(--color-primary);
}

.sidebar__text {
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
}

.sidebar__note {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.55;
  color: var(--color-text-muted);
  padding: var(--space-3);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
}

.sidebar__sources {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.sidebar__sources a {
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: oklch(from var(--color-primary) l c h / 0.4);
}
.sidebar__sources a:hover {
  color: var(--color-primary-hover);
}

.sidebar__nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface-2);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text);
}
.btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn:disabled {
  opacity: 0.35;
  pointer-events: none;
}

/* ============ Marker ============ */
.map-marker {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--color-text-inverse);
  box-shadow: 0 2px 6px oklch(0.1 0.02 60 / 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  transition: transform var(--transition-interactive);
}
.map-marker:hover {
  transform: scale(1.18);
}
.map-marker[data-active='true'] {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px oklch(from var(--color-primary) l c h / 0.35), 0 2px 6px oklch(0.1 0.02 60 / 0.4);
}

.maplibregl-popup-content {
  background: var(--color-surface) !important;
  color: var(--color-text) !important;
  font-family: var(--font-body) !important;
  border-radius: var(--radius-md) !important;
  border: 1px solid var(--color-border) !important;
  box-shadow: var(--shadow-md) !important;
  padding: var(--space-3) !important;
  font-size: var(--text-sm) !important;
}
.maplibregl-popup-tip {
  border-top-color: var(--color-surface) !important;
}
.popup__title {
  font-weight: 700;
  margin-bottom: 2px;
}
.popup__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.maplibregl-ctrl-attrib {
  font-family: var(--font-mono) !important;
  font-size: 10px !important;
}
.maplibregl-ctrl-bottom-left {
  margin-bottom: 0 !important;
}
.maplibregl-ctrl-top-right {
  top: 68px !important;
  z-index: 30 !important;
}
@media (max-width: 860px) {
  .maplibregl-ctrl-top-right {
    top: 64px !important;
  }
}

/* ============ About panel ============ */
.about-panel {
  position: absolute;
  z-index: 60;
  inset: 0;
  background: oklch(0.1 0.02 60 / 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
.about-panel[data-open='true'] {
  display: flex;
}
.about-panel__card {
  max-width: 560px;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
}
.about-panel__card h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
}
.about-panel__card p {
  font-size: var(--text-sm);
  line-height: 1.65;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}
.about-panel__card p:last-of-type {
  margin-bottom: 0;
}
.about-panel__close-row {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-5);
  position: sticky;
  bottom: calc(-1 * var(--space-6));
  padding: var(--space-3) 0;
  background: var(--color-surface);
}

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .header {
    padding: var(--space-2) var(--space-3);
  }
  .header__subtitle {
    display: none;
  }
  .legend {
    top: calc(var(--space-2) + 52px);
    left: var(--space-3);
    right: var(--space-3);
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: var(--space-1);
    scrollbar-width: none;
  }
  .legend::-webkit-scrollbar {
    display: none;
  }
  .legend .chip {
    flex-shrink: 0;
  }
  .timeline-wrap {
    left: var(--space-3);
    right: var(--space-3);
    bottom: var(--space-6);
  }
  .sidebar {
    width: 100vw;
    top: auto;
    height: min(72vh, 640px);
    border-left: none;
    border-top: 1px solid var(--color-border);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transform: translateY(100%);
  }
  .sidebar[data-open='true'] {
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .header__title {
    font-size: var(--text-base);
  }
  .timeline-item {
    width: 128px;
  }
}