:root {
  --paper: #e6d8b6;
  --paper-dark: #cbb88d;
  --ink: #3a2d22;
  --ink-soft: #6b5740;
  --leather: #5a3d2b;
  --gold: #c9a227;
  --gold-soft: #e0c46a;
  --bg: #14100d;
  --red: #a03a2a;
  --blue: #2c4a6b;
  --green: #3f5c3a;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "Segoe Script", cursive;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-user-select: none; user-select: none; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  font-family: var(--serif);
  color: var(--paper);
}

#app { position: fixed; inset: 0; }
#scene { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
#cesium-container {
  position: absolute; inset: 0; width: 100%; height: 100%;
  visibility: hidden; background: #14100d;
}
#cesium-container.visible { visibility: visible; }
#cesium-container .cesium-viewer,
#cesium-container .cesium-widget,
#cesium-container canvas { width: 100%; height: 100%; }
/* 隐藏左下角全部归属信息（Cesium ion logo + 影像文字） */
#cesium-container .cesium-widget-credits { display: none !important; }

/* 标记便签 DOM 覆盖层（在 Cesium 画布之上） */
#marker-layer {
  position: absolute; inset: 0; z-index: 20;
  pointer-events: none;
}
.marker-note {
  position: absolute;
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

/* 气氛遮罩 */
.vignette {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse at 50% 42%, transparent 40%, rgba(8, 5, 3, 0.55) 100%);
  /* 不启用 mix-blend-mode，避免每帧全屏合成开销（深色半透明覆盖即可） */
}
.grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
#iris {
  position: absolute; inset: 0; pointer-events: none;
  background: #0c0906; opacity: 0; transition: opacity 0.18s ease;
}

/* 加载界面：OS1 3D 加载环 */
#loading {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 26px;
  background: #14100d;
  transition: opacity 0.6s ease;
}
#loading.hidden { opacity: 0; pointer-events: none; }
#loading-canvas {
  width: 500px; height: 500px;
  max-width: 88vw; max-height: 88vw;
}
#loading-canvas canvas { width: 100%; height: 100%; display: block; }
.loading-text {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: rgba(224, 196, 106, 0.8);
}

/* 顶部标题 */
.hud { position: absolute; z-index: 40; }
.top-left { top: 22px; left: 26px; }
.title {
  font-size: clamp(20px, 2.4vw, 34px);
  letter-spacing: 0.12em; font-weight: 600; color: var(--gold-soft);
  text-shadow: 0 1px 12px rgba(0,0,0,0.7);
}
.subtitle {
  margin-top: 4px; font-size: 12px; letter-spacing: 0.18em;
  color: rgba(230,216,182,0.65); font-family: var(--serif);
}

/* 视图切换（单按钮，图标循环切换） */
.view-btn {
  flex-shrink: 0;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  color: var(--gold-soft); cursor: pointer;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(201,162,39,0.4);
  border-radius: 50%;
  transition: all 0.2s ease;
}
.view-btn:hover { background: rgba(201,162,39,0.25); color: #fff; }
.v-icon { display: none; width: 17px; height: 17px; }
.view-btn[data-view="binder"] .v-binder { display: block; }
.view-btn[data-view="timeline"] .v-timeline { display: block; }
.view-btn[data-view="globe"] .v-globe { display: block; }

/* 底部导航 */
.bottom-bar {
  left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 12px;
  padding: 5px 14px; border-radius: 4px;
  background: rgba(20,14,10,0.6); border: 1px solid rgba(201,162,39,0.25);
  backdrop-filter: blur(6px);
}
.nav-btn {
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 15px; line-height: 1;
  width: 32px; height: 32px; border-radius: 50%;
  color: var(--gold-soft); cursor: pointer;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(201,162,39,0.4);
  transition: all 0.2s ease;
}
.nav-btn:hover { background: rgba(201,162,39,0.25); color: #fff; transform: scale(1.06); }
.nav-btn:active { transform: scale(0.96); }
.flip-hint { width: auto; border-radius: 20px; padding: 0 18px; letter-spacing: 0.12em; font-size: 14px; }
.page-indicator { display: flex; align-items: center; gap: 6px; min-width: 0; justify-content: center; }
#page-num { font-size: 22px; color: var(--gold-soft); font-family: var(--serif); }
.sep { color: rgba(230,216,182,0.5); }
#page-total { color: rgba(230,216,182,0.6); font-family: var(--serif); }
.page-name {
  font-size: 14px; color: var(--paper); letter-spacing: 0.05em; margin-left: 10px;
  flex: 0 0 160px; /* 固定宽度，导航条不随词条名长短变化 */
  text-align: center;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* 登记卡详情 */
.detail-card {
  right: 24px; bottom: 22px; width: min(320px, 82vw);
  z-index: 40; /* 始终置顶，盖在标记便签层之上 */
  padding: 18px 20px; border-radius: 4px;
  background: linear-gradient(180deg, rgba(232,216,182,0.96), rgba(214,196,156,0.96));
  color: var(--ink); box-shadow: 0 18px 50px rgba(0,0,0,0.55), inset 0 0 0 1px rgba(90,61,43,0.4);
  transform: translateY(0); transition: transform 0.35s ease, opacity 0.35s ease;
}
.detail-card.hidden { opacity: 0; pointer-events: none; transform: translateY(14px); }
.detail-head { display: flex; justify-content: space-between; align-items: center; }
.detail-no { font-family: Consolas, "Courier New", "Lucida Console", monospace; font-size: 13px; letter-spacing: 0.02em; color: var(--ink-soft); }
.detail-cat {
  font-size: 12px; padding: 2px 10px; border-radius: 2px;
  background: var(--leather); color: var(--gold-soft); letter-spacing: 0.2em;
}
.detail-name {
  margin: 8px 0 12px; font-size: 22px; letter-spacing: 0.06em; font-weight: 600;
}
.detail-fields { border-top: 1px solid rgba(90,61,43,0.3); padding-top: 8px; }
.field { display: flex; gap: 12px; font-size: 13px; line-height: 1.9; }
.field dt {
  flex: 0 0 34px; color: var(--ink-soft); letter-spacing: 0.1em;
}
.field dd { color: var(--ink); }
.detail-desc {
  margin-top: 10px; font-size: 13.5px; line-height: 1.75; color: var(--ink);
  border-left: 3px solid var(--gold); padding-left: 10px;
}
.detail-sketch { margin-top: 12px; border-top: 1px dashed rgba(90,61,43,0.4); padding-top: 10px; }
.detail-sketch canvas { width: 100%; height: 170px; object-fit: contain; border-radius: 2px; opacity: 0.94; }

/* 提示（导航条下方） */
.hint {
  left: 50%; transform: translateX(-50%); bottom: 5px;
  font-size: 12px; letter-spacing: 0.06em;
  color: rgba(230,216,182,0.55);
  white-space: nowrap;
}

@media (max-width: 760px) {
  .detail-card { display: none; }
  .subtitle { display: none; }
  .page-name { display: none; }
  .hint { display: none; }
}