:root {
  --bg: #14141f;
  --panel: #1e1e30;
  --accent: #f5a524;
  --accent-soft: rgba(245, 165, 36, 0.28);
  --accent-soft-hover: rgba(245, 165, 36, 0.48);
  --text: #eee6d8;
  --text-dim: #9a95ab;
  --speaking: rgba(76, 201, 145, 0.55);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 20px;
  background: var(--panel);
  border-bottom: 1px solid #33334a;
  flex-wrap: wrap;
}

.topbar-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.book-icon { font-size: 28px; }

.topbar-title h1 {
  font-size: 17px;
  margin: 0;
  font-weight: 600;
}

.subtitle {
  display: block;
  font-size: 12px;
  font-weight: 400;
  color: var(--text-dim);
  margin-top: 2px;
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.unit-jump {
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

select, input[type="number"] {
  background: #2a2a40;
  color: var(--text);
  border: 1px solid #40405c;
  border-radius: 6px;
  padding: 5px 8px;
  font-size: 13px;
}

.btn {
  background: #2a2a40;
  color: var(--text);
  border: 1px solid #40405c;
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover { background: #34344e; border-color: var(--accent); }

.btn-toggle.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: #ffdca8;
}

.btn-small { padding: 6px 10px; font-size: 12px; }

.viewer {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  min-height: 0;
}

.nav-arrow {
  background: var(--panel);
  color: var(--text);
  border: 1px solid #40405c;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  font-size: 22px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.1s;
}

.nav-arrow:hover { background: var(--accent-soft); transform: scale(1.05); }
.nav-arrow:disabled { opacity: 0.3; cursor: default; transform: none; }

.page-stage {
  position: relative;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-container {
  position: relative;
  max-height: calc(100vh - 140px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
  line-height: 0;
}

.page-image {
  display: block;
  max-height: calc(100vh - 140px);
  max-width: 82vw;
  width: auto;
  height: auto;
  user-select: none;
}

.hotspot-layer {
  position: absolute;
  inset: 0;
}

.hotspot {
  position: absolute;
  cursor: pointer;
  border-radius: 3px;
  background: transparent;
  transition: background 0.12s;
}

.zones-visible .hotspot {
  background: var(--accent-soft);
  outline: 1px solid rgba(245, 165, 36, 0.55);
}

.hotspot:hover {
  background: var(--accent-soft-hover) !important;
  outline: 1px solid var(--accent) !important;
}

.hotspot.speaking {
  background: var(--speaking) !important;
  outline: 1.5px solid #4cc991 !important;
}

.loading-msg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 14px;
  background: rgba(20, 20, 31, 0.6);
}

.loading-msg.hidden { display: none; }

.bottombar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 10px 20px;
  background: var(--panel);
  border-top: 1px solid #33334a;
  flex-wrap: wrap;
}

.page-jump {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-jump input {
  width: 56px;
  text-align: center;
}

#pageTotal { color: var(--text-dim); font-size: 13px; }

.hint {
  color: var(--text-dim);
  font-size: 12.5px;
}

@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .page-image, .page-container { max-width: 94vw; }
  .hint { display: none; }
}