/* ── Study Mode ── */

/* ── Full-window layout ── */
.study-page {
  max-width: 100%;
  height: 100vh;
  height: 100dvh; /* adapts as Android URL bar shows/hides */
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  overflow: hidden;
}
.study-page .card {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  box-sizing: border-box;
}
.study-page .mapwrap {
  flex: 1;
  margin: 6px 0 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.study-page #map {
  flex: 1;
  min-height: 0;
  min-width: 0;
  -webkit-tap-highlight-color: transparent;
}

/* Menu button sits inside the header row as a flex child */
.study-page .menu-btn {
  position: static;
  width: 40px;
  height: 40px;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: none;
}

/* ── Study info panel ── */
.study-info-panel {
  position: absolute;
  bottom: 16px;
  left: 16px;
  z-index: 20;
  background: var(--panel-bg, rgba(15,20,40,.96));
  border: 1px solid var(--panel-border, rgba(255,255,255,.14));
  border-radius: 14px;
  padding: 14px 16px 12px;
  min-width: 210px;
  max-width: 280px;
  box-shadow: 0 4px 24px rgba(0,0,0,.35);
  pointer-events: none;
}
.study-info-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 0;
}
.study-info-flag {
  width: 44px;
  height: 30px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--panel-border, rgba(255,255,255,.14));
  flex-shrink: 0;
}
.study-info-flag-placeholder {
  width: 44px;
  height: 30px;
  border-radius: 4px;
  background: var(--card-border, rgba(255,255,255,.12));
  flex-shrink: 0;
}
.study-info-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}
.study-info-region {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.2;
}
.study-info-divider {
  height: 1px;
  background: var(--hr-color, rgba(255,255,255,.12));
  margin: 10px 0 8px;
}
.study-info-rows {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.study-info-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
}
.study-info-row > span:first-child {
  color: var(--text-muted);
  flex-shrink: 0;
}
.study-info-row > span:last-child {
  color: var(--text-primary);
  text-align: right;
  font-weight: 500;
}
.study-info-borders > span:last-child {
  text-align: right;
  max-width: 170px;
  word-break: break-word;
  hyphens: auto;
}

/* ── Heritage site popup ── */
.heritage-popup {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 30;
  background: var(--panel-bg, rgba(15,20,40,.96));
  border: 1px solid var(--panel-border, rgba(255,255,255,.14));
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,.5);
  width: 75%;
  max-height: 85%;
  pointer-events: all;
  display: flex;
  flex-direction: column;
}
.heritage-popup-img {
  display: block;
  width: 100%;
  flex: 1;
  min-height: 0;
  object-fit: cover;
}
.heritage-popup-footer {
  padding: 10px 14px 12px;
}
.heritage-popup-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}
.heritage-popup-meta {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
}
.heritage-popup-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.55);
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  z-index: 1;
}
.heritage-popup-close:hover {
  background: rgba(0,0,0,0.8);
  color: #fff;
}

/* ── Overlay icon (replaces flag in info panel for rivers/mountains/heritage) ── */
.study-info-overlay-icon {
  width: 44px;
  height: 30px;
  border-radius: 4px;
  border: 1px solid var(--panel-border, rgba(255,255,255,.14));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

/* ── Map toggle buttons ── */
.study-map-toggles {
  position: absolute;
  bottom: 12px;
  right: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 10;
}
.study-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  color: rgba(255,255,255,0.75);
  font-size: 0.85rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s, transform 0.15s;
}
.study-toggle-btn:hover {
  background: rgba(0,0,0,0.75);
  color: #fff;
  transform: scale(1.08);
}
.study-toggle-btn.active {
  background: rgba(99,102,241,0.75);
  border-color: rgba(165,180,252,0.6);
  color: #fff;
}
.study-toggle-btn.active:hover {
  background: rgba(99,102,241,0.9);
}
.study-toggle-btn.active[data-mode="2"] {
  background: rgba(120,80,0,0.8);
  border-color: rgba(251,191,36,0.5);
  color: #fbbf24;
}
.study-toggle-btn.active[data-mode="2"]:hover {
  background: rgba(145,100,0,0.9);
}
.study-toggle-btn.active[data-mode="3"] {
  background: rgba(0,100,80,0.8);
  border-color: rgba(52,211,153,0.5);
  color: #34d399;
}
.study-toggle-btn.active[data-mode="3"]:hover {
  background: rgba(0,120,100,0.9);
}

/* ── Timeline bar ── */
.study-timeline-bar {
  display: none;
  padding: 8px 10px 6px;
  border-bottom: 1px solid var(--panel-border, rgba(255,255,255,.12));
  position: relative;
}
.study-timeline-bar.visible {
  display: flex;
  align-items: center;
  gap: 8px;
}
.study-timeline-track {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex: 1;
  min-width: 0;
  padding: 2px 0;
}
.study-timeline-track::-webkit-scrollbar { display: none; }
.study-timeline-chip {
  flex-shrink: 0;
  padding: 5px 12px;
  border-radius: 20px;
  border: 1px solid var(--panel-border, rgba(255,255,255,.14));
  background: var(--card-bg, rgba(15,20,40,.6));
  color: var(--text-primary);
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s, border-color 0.2s, transform 0.12s;
  border-left: 3px solid var(--empire-color, rgba(255,255,255,.3));
}
.study-timeline-chip:hover {
  background: var(--card-bg-hover, rgba(30,35,60,.8));
  transform: scale(1.04);
}
.study-timeline-chip.active {
  background: color-mix(in srgb, var(--empire-color) 25%, transparent);
  border-color: var(--empire-color);
  border-left-color: var(--empire-color);
}
.study-timeline-close {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.08);
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.study-timeline-close:hover {
  background: rgba(255,255,255,0.15);
  color: var(--text-primary);
}

/* ── Mobile ── */
@media (max-width: 600px) {
  /* Hide hamburger on mobile */
  .study-page .menu-btn { display: none; }

  /* Toggle buttons: horizontal row at bottom-center */
  .study-map-toggles {
    flex-direction: row;
    right: unset;
    left: 50%;
    transform: translateX(-50%);
    bottom: 10px;
    gap: 10px;
  }
  /* Info panel: move to top-left so it doesn't overlap bottom buttons */
  .study-info-panel {
    bottom: unset;
    top: 16px;
  }
  /* Heritage popup: fill more of the screen on mobile */
  .heritage-popup {
    width: 90%;
  }
  /* Timeline chips: smaller on mobile */
  .study-timeline-chip {
    padding: 4px 9px;
    font-size: 11px;
  }
  .study-timeline-bar.visible {
    padding: 6px 8px 4px;
  }
}