/* History Atlas · Skyline stylesheet
   两种模式: 古籍风 (archival) 与 现代风 (modern)
   通过 body 的 data-theme 切换 */

:root {
  --bg-deep:      #0a0e16;
  --bg-panel:    rgba(14,19,30,0.94);
  --bg-soft:      #121724;
  --line-weak:    rgba(200,180,130,0.06);
  --line-mid:     rgba(200,180,130,0.14);
  --line-strong:  rgba(200,180,130,0.28);
  --ink-1:        #E8DFCB;    /* 主文字 */
  --ink-2:        #A89D84;    /* 次文字 */
  --ink-3:        #6B6450;    /* 弱文字 */
  --gold:         #C8A24C;
  --gold-dim:     #8A7234;
  --accent:       #B24A38;
  --event-line:   rgba(200,162,76,0.35);
  --event-text:   #C8A24C;
  --serif:        'EB Garamond','Cormorant Garamond','Noto Serif SC','Songti SC',serif;
  --sans:         'Inter','Noto Sans SC','PingFang SC',-apple-system,sans-serif;
  --mono:         'JetBrains Mono','SF Mono',monospace;
}

/* 现代风: 更冷、更硬、更数据化 */
body[data-theme='modern'] {
  --bg-deep:      #07090e;
  --bg-panel:    rgba(10,14,22,0.96);
  --bg-soft:      #0d1220;
  --line-weak:    rgba(120,160,210,0.06);
  --line-mid:     rgba(120,160,210,0.14);
  --line-strong:  rgba(120,160,210,0.30);
  --ink-1:        #E6ECF5;
  --ink-2:        #8C99B0;
  --ink-3:        #4E5770;
  --gold:         #6FB3D9;
  --gold-dim:     #3C6A88;
  --accent:       #D9604B;
  --event-line:   rgba(111,179,217,0.40);
  --event-text:   #8AC3E0;
  --serif:        'Inter','Noto Sans SC',-apple-system,sans-serif;
  --sans:         'Inter','Noto Sans SC','PingFang SC',-apple-system,sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; overflow: hidden; }
body {
  background: var(--bg-deep);
  color: var(--ink-1);
  font-family: var(--sans);
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 纸张纹理（古籍风） */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(200,162,76,0.04), transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(178,74,56,0.03), transparent 50%);
  pointer-events: none;
  z-index: 0;
}
body[data-theme='modern']::before {
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(111,179,217,0.04), transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(217,96,75,0.03), transparent 50%);
}

/* 暗角 */
body::after {
  content: '';
  position: fixed; inset: 0;
  box-shadow: inset 0 0 180px rgba(0,0,0,0.7);
  pointer-events: none;
  z-index: 10;
}

/* =================== HEADER =================== */
.masthead {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 66px;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(180deg, rgba(10,14,22,0.96) 0%, rgba(10,14,22,0.88) 100%);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-mid);
}
.mast-title { display: flex; align-items: baseline; gap: 14px; }
.mast-mark {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--ink-1);
  font-style: italic;
}
.mast-mark em { color: var(--gold); font-style: normal; font-weight: 600; }
.mast-sub {
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--ink-3);
}
body[data-theme='modern'] .mast-mark { font-style: normal; font-weight: 600; letter-spacing: -0.01em; }

.mast-tools { display: flex; align-items: center; gap: 6px; }

.lang-switch {
  display: flex;
  border: 1px solid var(--line-mid);
  border-radius: 4px;
  overflow: hidden;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.lang-switch button {
  background: transparent;
  border: none;
  color: var(--ink-3);
  padding: 6px 10px;
  cursor: pointer;
  font-family: var(--sans);
  transition: all 0.15s;
}
.lang-switch button.active { background: var(--line-mid); color: var(--ink-1); }
.lang-switch button:hover:not(.active) { color: var(--ink-2); }

.mast-divider { width: 1px; height: 24px; background: var(--line-mid); margin: 0 10px; }

.filter-region {
  display: flex;
  gap: 2px;
}
.filter-region button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--ink-3);
  padding: 5px 10px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.06em;
  border-radius: 3px;
  transition: all 0.15s;
}
.filter-region button:hover { color: var(--ink-1); }
.filter-region button.active {
  color: var(--gold);
  border-color: var(--gold-dim);
  background: rgba(200,162,76,0.06);
}

.search-wrap {
  position: relative;
  width: 180px;
}
.search-wrap input {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line-mid);
  color: var(--ink-1);
  padding: 6px 10px 6px 26px;
  font-family: var(--sans);
  font-size: 11px;
  border-radius: 3px;
  outline: none;
  letter-spacing: 0.02em;
}
.search-wrap input:focus { border-color: var(--gold-dim); }
.search-wrap input::placeholder { color: var(--ink-3); }
.search-wrap svg { position: absolute; left: 8px; top: 8px; opacity: 0.5; }

.search-results {
  position: absolute;
  top: 38px; left: 0;
  width: 260px;
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  max-height: 320px;
  overflow-y: auto;
  display: none;
  z-index: 150;
  box-shadow: 0 12px 32px rgba(0,0,0,0.6);
}
.search-results.open { display: block; }
.search-results .sr-item {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-weak);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}
.search-results .sr-item:hover,
.search-results .sr-item.active {
  background: rgba(200,162,76,0.12);
  border-left: 2px solid var(--gold);
  padding-left: 12px;
}
.sr-name { font-size: 13px; color: var(--ink-1); font-weight: 500; }
.sr-meta { font-size: 10px; color: var(--ink-3); letter-spacing: 0.08em; }

/* =================== SKYLINE STAGE =================== */
.stage {
  position: fixed;
  top: 66px; bottom: 78px;
  left: 0; right: 0;
  overflow: hidden;
  z-index: 1;
  cursor: grab;
  /* Prevent text selection inside the canvas — dragging is for panning, not selecting. */
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}
.stage:active { cursor: grabbing; }
/* While actively panning, suppress selection everywhere so mouse drift into
   adjacent elements (axis, masthead) doesn't produce a selection sweep. */
body.is-panning,
body.is-panning * {
  -webkit-user-select: none !important;
  -moz-user-select: none !important;
  user-select: none !important;
  cursor: grabbing !important;
}
.stage-inner {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  will-change: transform;
}

/* 横向时间轴（在底部） */
.timeline-axis {
  position: fixed;
  left: 0; right: 0;
  bottom: 0;
  height: 78px;
  background: linear-gradient(0deg, var(--bg-soft) 0%, rgba(13,18,32,0.95) 100%);
  border-top: 1px solid var(--line-mid);
  z-index: 50;
  overflow: hidden;
}
.axis-scroll {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  will-change: transform;
}
.axis-tick {
  position: absolute;
  bottom: 0;
  width: 1px;
  background: var(--line-mid);
}
.axis-tick.major { background: var(--line-strong); height: 22px; }
.axis-tick.minor { height: 10px; }
.axis-label {
  position: absolute;
  bottom: 28px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  transform: translateX(-50%);
  white-space: nowrap;
}
.axis-label.era {
  bottom: 52px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 11px;
  color: var(--gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
body[data-theme='modern'] .axis-label.era { font-style: normal; font-weight: 500; }

/* ================== MINIMAP + DENSITY HEATMAP ================== */
.minimap {
  position: fixed;
  left: 12px;
  top: 80px;
  bottom: 20px;
  width: 56px;
  max-height: 640px;
  padding: 20px 5px 8px;
  background: rgba(12, 9, 5, 0.58);
  border: 1px solid var(--line-mid);
  border-radius: 3px;
  backdrop-filter: blur(6px) saturate(1.1);
  -webkit-backdrop-filter: blur(6px) saturate(1.1);
  z-index: 35;
  cursor: crosshair;
  user-select: none;
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  transition: opacity 0.18s;
  box-sizing: border-box;
}
.minimap.hidden { opacity: 0; pointer-events: none; }
.minimap:hover { border-color: var(--gold-dim); }
.mm-label {
  position: absolute;
  top: 6px; left: 0; right: 0;
  text-align: center;
  font-family: var(--mono, 'JetBrains Mono', monospace);
  font-size: 8px;
  letter-spacing: 0.18em;
  color: var(--ink-3);
  pointer-events: none;
}
.mm-canvas {
  display: block;
  margin: 0 auto;
}
.mm-viewport {
  position: absolute;
  left: 3px;
  right: 3px;
  background: rgba(200, 162, 76, 0.12);
  border-top: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
  pointer-events: none;
  box-shadow: 0 0 8px rgba(200,162,76,0.3) inset;
  transition: top 0.08s, height 0.08s;
}
.mm-tooltip {
  position: absolute;
  left: 64px;
  top: 0;
  display: none;
  padding: 6px 10px;
  background: var(--bg-deep);
  border: 1px solid var(--gold-dim);
  border-radius: 2px;
  font-family: var(--serif);
  font-size: 12px;
  color: var(--ink-1);
  white-space: nowrap;
  pointer-events: none;
  transform: translateY(-50%);
  box-shadow: 0 4px 14px rgba(0,0,0,0.4);
  z-index: 36;
}
.mm-tooltip.open { display: block; }
.mm-tooltip b { display: block; font-family: var(--mono, monospace); font-size: 11px; color: var(--gold); letter-spacing: 0.06em; margin-bottom: 2px; }
.mm-tooltip em { font-style: normal; font-size: 10.5px; color: var(--ink-3); letter-spacing: 0.04em; }
body[data-theme='modern'] .mm-tooltip b { font-family: var(--sans); }
body[data-theme='modern'] .minimap { background: rgba(230, 228, 222, 0.65); }
body[data-theme='modern'] .mm-label,
body[data-theme='modern'] .mm-tooltip em { color: var(--ink-2); }

/* Hide on narrow viewports or non-spine views */
@media (max-width: 900px) {
  .minimap { display: none; }
}

/* 当前聚焦的年份指示 */
.now-indicator {
  position: fixed;
  top: 66px; bottom: 78px;
  width: 1px;
  background: var(--gold);
  opacity: 0.72;
  z-index: 40;
  pointer-events: none;
  box-shadow: 0 0 8px rgba(200,162,76,0.55), 0 0 2px rgba(200,162,76,0.8);
}
.now-indicator::before {
  content: '';
  position: absolute;
  bottom: -6px;
  left: -5px;
  width: 11px; height: 11px;
  background: var(--gold);
  transform: rotate(45deg);
  box-shadow: 0 0 10px rgba(200,162,76,0.75);
}
.now-year {
  position: fixed;
  z-index: 41;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: var(--bg-deep);
  padding: 3px 7px;
  border: 1px solid var(--gold-dim);
  border-radius: 2px;
  pointer-events: none;
  transform: translateX(-50%);
  top: 72px;
}

/* 背景网格（纵向年份竖线） */
.grid-lines {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  pointer-events: none;
}
.grid-v {
  position: absolute;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--line-weak);
}
.grid-v.major { background: var(--line-mid); }
.grid-v.century { background: var(--line-weak); }

/* 区域分带（横向 swimlane） */
.region-band {
  position: absolute;
  left: 0;
  width: 100%;
  border-bottom: 1px solid var(--line-weak);
}
.region-band:first-of-type { border-top: 1px solid var(--line-weak); }
.region-label {
  position: fixed;
  left: 20px;
  z-index: 8;
  pointer-events: none;
  transition: opacity 0.2s;
}
.region-label .rl-zh {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0.12em;
  color: var(--ink-1);
  font-weight: 500;
  display: block;
  line-height: 1;
}
body[data-theme='modern'] .region-label .rl-zh { font-family: var(--sans); font-weight: 600; letter-spacing: 0.02em; }
.region-label .rl-en {
  font-family: var(--sans);
  font-size: 9px;
  letter-spacing: 0.28em;
  color: var(--ink-3);
  text-transform: uppercase;
  display: block;
  margin-top: 5px;
}

/* 区域基线(地平线) */
.region-baseline {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--line-mid);
}

/* =================== CIVILIZATION SKYLINE BLOCKS =================== */
.civ-block {
  position: absolute;
  bottom: 0;   /* 从 baseline 向上生长——skyline 核心隐喻 */
  cursor: pointer;
  transition: filter 0.2s, transform 0.2s;
  transform-origin: center bottom;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 6px 8px 5px;
}
.civ-block::before {
  /* top-edge detail (像建筑的尖顶/女儿墙) */
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: rgba(255,255,255,0.25);
  mix-blend-mode: overlay;
}
.civ-block::after {
  /* soft glow on top edge */
  content: '';
  position: absolute;
  top: -6px; left: 0; right: 0;
  height: 6px;
  background: linear-gradient(180deg, transparent, currentColor);
  opacity: 0.25;
  pointer-events: none;
}
.civ-block:hover {
  filter: brightness(1.18) saturate(1.15);
  z-index: 20 !important;
}
.civ-block:hover::after { opacity: 0.5; }
.civ-block.dim { opacity: 0.18; }

.civ-name {
  font-family: var(--serif);
  font-size: 13px;
  color: #fff;
  font-weight: 500;
  line-height: 1.15;
  text-shadow: 0 1px 3px rgba(0,0,0,0.6);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
body[data-theme='modern'] .civ-name { font-family: var(--sans); font-weight: 600; }
.civ-block.tall .civ-name {
  writing-mode: vertical-rl;
  text-orientation: upright;
  max-height: 100%;
  white-space: normal;
  letter-spacing: 0.25em;
  font-size: 12px;
}
.civ-dates {
  font-family: var(--mono);
  font-size: 9px;
  color: rgba(255,255,255,0.72);
  letter-spacing: 0.04em;
  margin-top: 2px;
  white-space: nowrap;
}
.civ-block.short .civ-name,
.civ-block.short .civ-dates { display: none; }

/* =================== RIDGELINE VIEW =================== */
.ridge-band {
  position: absolute;
  left: 0;
  width: 100%;
  border-bottom: 1px solid var(--line-weak);
  transition: opacity 0.2s;
}
.ridge-band.dim { opacity: 0.22; }
.ridge-band:first-of-type { border-top: 1px solid var(--line-weak); }

.ridge-hit {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  height: 100%;
  cursor: crosshair;
  z-index: 2;
}

.ridge-peak {
  position: absolute;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  pointer-events: auto;
  transition: opacity 0.2s;
  white-space: nowrap;
}
.ridge-peak.dim { opacity: 0.2; }
.ridge-peak-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--bg-deep);
}
.ridge-peak-name {
  font-family: var(--serif);
  font-size: 11px;
  color: var(--ink-1);
  letter-spacing: 0.04em;
  background: linear-gradient(180deg, rgba(10,14,22,0.92), rgba(10,14,22,0.6));
  padding: 2px 6px;
  border-radius: 2px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}
body[data-theme='modern'] .ridge-peak-name {
  font-family: var(--sans);
  font-weight: 500;
}
.ridge-peak:hover .ridge-peak-name {
  color: var(--gold);
}

/* =================== GLOBAL EVENTS LAYER =================== */
/* Dedicated top band — events live here, never overlap civ blocks */
.events-band {
  position: absolute;
  top: 0; left: 0;
  height: 108px;   /* fixed height for 3 staircase rows + gap */
  pointer-events: none;
  z-index: 7;
  border-bottom: 1px dashed var(--line-weak);
}
.events-band::after {
  /* tiny header label */
  content: 'GLOBAL EVENTS';
  position: fixed;
  left: 20px;
  top: 72px;
  font-family: var(--sans);
  font-size: 9px;
  letter-spacing: 0.28em;
  color: var(--ink-3);
  pointer-events: none;
}
body[data-theme='archival'] .events-band::after { content: 'GLOBAL · EVENTS'; }

.event-marker {
  position: absolute;
  top: 0;
  width: 1px;
  background: var(--event-line);
  pointer-events: auto;
  z-index: 7;
}
.event-marker::before {
  /* diamond at the top (where label is) */
  content: '';
  position: absolute;
  top: -3px;
  left: 50%;
  width: 5px; height: 5px;
  border: 1px solid var(--event-line);
  background: var(--bg-deep);
  transform: translateX(-50%) rotate(45deg);
}
.event-marker::after {
  /* diamond at bottom where it meets civ area */
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  width: 4px; height: 4px;
  background: var(--event-text);
  transform: translateX(-50%) rotate(45deg);
  box-shadow: 0 0 4px var(--event-line);
}
.event-label {
  position: absolute;
  top: 8px;   /* overridden per-row */
  left: 6px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 11px;
  color: var(--event-text);
  letter-spacing: 0.04em;
  white-space: nowrap;
  pointer-events: auto;
  cursor: help;
  line-height: 1;
  transition: color 0.15s;
}
body[data-theme='modern'] .event-label { font-family: var(--sans); font-style: normal; font-weight: 500; }
.event-label .evt-year {
  font-family: var(--mono);
  font-style: normal;
  font-size: 9px;
  color: var(--ink-3);
  margin-right: 6px;
  letter-spacing: 0.06em;
}
.event-label:hover { color: var(--ink-1); }
.event-marker.hidden { display: none; }
/* zoom-dependent: when density is low, clip labels less aggressively via JS */

/* Extended dashed line from event label down past civ bands (subtle) */
.event-trail {
  position: absolute;
  top: 108px;   /* starts at bottom of events band */
  width: 1px;
  background: repeating-linear-gradient(180deg,
    var(--event-line) 0, var(--event-line) 3px,
    transparent 3px, transparent 8px);
  pointer-events: none;
  opacity: 0.5;
  z-index: 4;
}

/* =================== BOTTOM CONTROLS =================== */
.zoom-btns {
  display: flex;
  flex-direction: row;
  border: 1px solid var(--line-mid);
  border-radius: 4px;
  overflow: hidden;
}
.zoom-btns button {
  background: transparent;
  border: none;
  color: var(--ink-3);
  width: 26px; height: 24px;
  cursor: pointer;
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1;
  transition: all 0.15s;
}
.zoom-btns button + button { border-left: 1px solid var(--line-weak); }
.zoom-btns button:hover { background: var(--line-weak); color: var(--ink-1); }

/* Keyboard-shortcut hints — always-visible inline legend in the masthead. */
.kbd-hints {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--sans);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  opacity: 0.72;
  transition: opacity 0.2s;
  user-select: none;
}
.kbd-hints:hover { opacity: 1; }
.kbd-row {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}
.kbd-hints kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 16px;
  height: 18px;
  padding: 0 5px;
  font-family: var(--mono, 'JetBrains Mono', monospace);
  font-size: 10.5px;
  font-weight: 500;
  line-height: 1;
  color: var(--ink-2);
  background: var(--line-weak);
  border: 1px solid var(--line-mid);
  border-radius: 3px;
  box-shadow: 0 1px 0 var(--line-weak);
}
.kbd-hints kbd.kbd-mod {
  padding: 0 6px;
  font-size: 9.5px;
  letter-spacing: 0.05em;
}
.kbd-hints .kbd-desc {
  margin-right: 3px;
  color: var(--ink-3);
}
/* Auto-hide on narrow viewports to avoid masthead crowding. */
@media (max-width: 1100px) {
  .kbd-hints { display: none; }
}

/* =================== DETAIL PANEL =================== */
.detail-panel {
  position: fixed;
  top: 66px; right: 0;
  width: 400px;
  height: calc(100vh - 66px);
  background: var(--bg-panel);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--line-strong);
  z-index: 120;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.2,0.8,0.2,1);
  overflow-y: auto;
  box-shadow: -16px 0 48px rgba(0,0,0,0.6);
}
.detail-panel.open { transform: translateX(0); }
.dp-inner { padding: 36px 36px 48px; }
.dp-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 32px; height: 32px;
  background: transparent;
  border: 1px solid var(--line-mid);
  color: var(--ink-2);
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 14px;
  transition: all 0.15s;
}
.dp-close:hover { color: var(--ink-1); border-color: var(--gold-dim); }

.dp-kicker {
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.32em;
  color: var(--gold);
  margin-bottom: 10px;
}
.dp-title {
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 500;
  line-height: 1.05;
  color: var(--ink-1);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
body[data-theme='modern'] .dp-title { font-family: var(--sans); font-weight: 700; letter-spacing: -0.02em; font-size: 34px; }
.dp-title-en {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  color: var(--ink-2);
  margin-bottom: 24px;
  font-weight: 400;
}
body[data-theme='modern'] .dp-title-en { font-family: var(--sans); font-style: normal; font-weight: 400; }

.dp-bar {
  height: 3px;
  width: 80px;
  margin-bottom: 20px;
}

.dp-meta-grid {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 10px 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line-weak);
  border-bottom: 1px solid var(--line-weak);
  margin-bottom: 22px;
}
.dp-meta-grid dt {
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-3);
}
.dp-meta-grid dd {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-1);
  letter-spacing: 0.02em;
}
.dp-meta-grid dd.dates { color: var(--gold); }

.dp-section-h {
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  color: var(--ink-3);
  margin-bottom: 10px;
  margin-top: 22px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-weak);
}
.dp-desc {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-1);
  letter-spacing: 0.01em;
  text-wrap: pretty;
}
body[data-theme='modern'] .dp-desc { font-family: var(--sans); font-size: 14px; line-height: 1.7; }

.dp-ach {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.dp-ach span {
  font-family: var(--sans);
  font-size: 11px;
  padding: 4px 10px;
  border: 1px solid var(--line-mid);
  color: var(--ink-2);
  border-radius: 2px;
  letter-spacing: 0.04em;
}

.dp-concurrent {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.dp-concurrent .cc {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  padding: 8px 10px;
  border: 1px solid var(--line-weak);
  cursor: pointer;
  transition: all 0.15s;
  border-radius: 2px;
}
.dp-concurrent .cc:hover { border-color: var(--gold-dim); background: rgba(200,162,76,0.04); }
.cc-swatch { width: 3px; height: 24px; flex-shrink: 0; }
.cc-name { font-family: var(--serif); color: var(--ink-1); font-size: 13px; flex: 1; }
body[data-theme='modern'] .cc-name { font-family: var(--sans); font-weight: 500; }
.cc-region { font-size: 10px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.12em; }

/* =================== TOOLTIP =================== */
.tooltip {
  position: fixed;
  z-index: 200;
  background: var(--bg-deep);
  border: 1px solid var(--gold-dim);
  padding: 10px 14px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-1);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6);
  border-radius: 2px;
  max-width: 280px;
}
.tooltip.open { opacity: 1; }
.tooltip b { color: var(--gold); font-weight: 500; display: block; margin-bottom: 4px; font-family: var(--serif); font-size: 13px; }
body[data-theme='modern'] .tooltip b { font-family: var(--sans); }
.tooltip em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
}

/* =================== TWEAKS PANEL =================== */
.tweaks {
  position: fixed;
  bottom: 92px; right: 24px;
  width: 260px;
  background: var(--bg-panel);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 18px 20px 20px;
  z-index: 70;
  display: none;
  box-shadow: 0 16px 40px rgba(0,0,0,0.5);
}
.tweaks.open { display: block; }
.tw-close {
  position: absolute;
  top: 8px;
  right: 10px;
  width: 22px;
  height: 22px;
  background: transparent;
  border: none;
  color: var(--ink-3);
  font-size: 12px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  border-radius: 3px;
  transition: all 0.15s;
}
.tw-close:hover { background: var(--line-weak); color: var(--ink-1); }
.tw-title {
  font-family: var(--serif);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}
body[data-theme='modern'] .tw-title { font-family: var(--sans); font-style: normal; font-weight: 600; }
.tw-group { margin-bottom: 14px; }
.tw-label {
  font-family: var(--sans);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
}
.tw-options {
  display: flex;
  gap: 4px;
  border: 1px solid var(--line-mid);
  border-radius: 3px;
  overflow: hidden;
}
.tw-options button {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ink-2);
  padding: 7px 8px;
  font-family: var(--sans);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.04em;
}
.tw-options button.active { background: var(--gold); color: var(--bg-deep); font-weight: 600; }
.tw-options button:hover:not(.active) { background: var(--line-weak); color: var(--ink-1); }

/* =================== HERO / ENTRY OVERLAY =================== */
.hero {
  position: fixed; inset: 0;
  z-index: 300;
  background: radial-gradient(ellipse at center, rgba(14,19,30,0.94) 0%, rgba(5,7,12,0.98) 70%);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.8s, visibility 0s 0.8s;
}
.hero.hidden { opacity: 0; visibility: hidden; }
.hero-inner {
  max-width: 680px;
  padding: 0 40px;
  text-align: center;
}
.hero-kicker {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.45em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 22px;
}
.hero-title {
  font-family: var(--serif);
  font-size: 82px;
  font-weight: 500;
  line-height: 0.95;
  color: var(--ink-1);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
body[data-theme='modern'] .hero-title { font-family: var(--sans); font-weight: 700; letter-spacing: -0.02em; font-size: 78px; }
.hero-title em {
  font-style: italic;
  color: var(--gold);
  font-weight: 400;
}
body[data-theme='modern'] .hero-title em { font-style: normal; font-weight: 500; }
.hero-title-zh {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0.5em;
  color: var(--ink-2);
  margin-bottom: 32px;
  font-weight: 400;
}
.hero-desc {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
  margin-bottom: 40px;
  text-wrap: pretty;
  font-style: italic;
}
body[data-theme='modern'] .hero-desc { font-family: var(--sans); font-style: normal; }
.hero-enter {
  background: transparent;
  border: 1px solid var(--gold-dim);
  color: var(--gold);
  padding: 14px 36px;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s;
}
.hero-enter:hover {
  background: var(--gold);
  color: var(--bg-deep);
  border-color: var(--gold);
  letter-spacing: 0.5em;
  padding: 14px 44px;
}
.hero-ornament {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 32px;
  color: var(--gold-dim);
}
.hero-ornament::before, .hero-ornament::after {
  content: '';
  height: 1px;
  width: 80px;
  background: currentColor;
}

/* scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-mid); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--line-strong); }

/* =================== SPINE VIEW =================== */
/* Hide the bottom horizontal axis when spine is active (spine has its own) */
body[data-view='spine'] .timeline-axis { display: none; }
body[data-view='spine'] .stage { bottom: 24px; top: 66px; padding-top: 44px; left: 80px; }
body[data-view='spine'] .stage-inner { top: 44px; }
/* Below the minimap breakpoint, reclaim the full width since the minimap is hidden. */
@media (max-width: 900px) {
  body[data-view='spine'] .stage { left: 0; }
}

/* Fixed top strip of region column headers */
.spine-headers-bar {
  position: absolute;
  top: 0;
  left: 0; right: 0;
  height: 44px;
  pointer-events: none;
  z-index: 5;
  background: linear-gradient(to bottom, var(--bg-deep) 0%, var(--bg-deep) 80%, transparent 100%);
  border-bottom: 1px solid var(--line-weak);
}
.spine-header-cell {
  position: absolute;
  top: 0;
  height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.spine-header-cell .sh-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  margin-bottom: 2px;
  opacity: 0.85;
}
.sh-primary {
  font-family: var(--serif);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--ink-1);
  text-align: center;
  line-height: 1.18;
  white-space: normal;
  overflow-wrap: anywhere;
  max-width: 100%;
  padding: 0 4px;
  box-sizing: border-box;
}
body[data-theme='modern'] .sh-primary {
  font-family: var(--sans);
  font-weight: 600;
}
.spine-header-center {
  position: absolute;
  top: 0;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.spine-header-center span {
  font-family: var(--serif);
  font-style: italic;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--gold-dim);
  text-transform: uppercase;
}
body[data-theme='modern'] .spine-header-center span {
  font-family: var(--sans);
  font-style: normal;
  color: var(--ink-3);
}

.spine-wrap {
  position: relative;
  width: 100%;
  min-height: 100%;
}

/* Center vertical spine */
.spine-axis {
  position: absolute;
  top: 0;
  border-left: 1px solid var(--gold-dim);
  border-right: 1px solid var(--gold-dim);
  background:
    linear-gradient(to right,
      transparent 0%,
      rgba(200, 162, 76, 0.04) 20%,
      rgba(200, 162, 76, 0.08) 50%,
      rgba(200, 162, 76, 0.04) 80%,
      transparent 100%);
  pointer-events: none;
}
body[data-theme='modern'] .spine-axis {
  border-color: rgba(120, 140, 160, 0.22);
  background: linear-gradient(to right,
      transparent 0%,
      rgba(120, 140, 160, 0.05) 50%,
      transparent 100%);
}

/* Spine ticks (horizontal marks on the vertical axis) */
.spine-tick {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
}
.spine-tick.minor {
  background: var(--line-weak);
  opacity: 0.4;
  left: 40%; right: 40%;
}
.spine-tick.major {
  background: var(--gold-dim);
  opacity: 0.6;
  left: 15%; right: 15%;
}
body[data-theme='modern'] .spine-tick.major {
  background: rgba(120, 140, 160, 0.5);
}

.spine-year-label {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: var(--bg-deep);
  padding: 2px 5px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 2;
}
body[data-theme='modern'] .spine-year-label {
  font-family: var(--sans);
  font-weight: 500;
  color: var(--ink-2);
}

.spine-zero {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  pointer-events: none;
}
.spine-zero span {
  display: inline-block;
  font-family: var(--serif);
  font-size: 10px;
  font-style: italic;
  letter-spacing: 0.25em;
  color: var(--gold);
  background: var(--bg-deep);
  border-top: 1px solid var(--gold-dim);
  border-bottom: 1px solid var(--gold-dim);
  padding: 4px 14px;
  white-space: nowrap;
}
body[data-theme='modern'] .spine-zero span {
  font-family: var(--sans);
  font-style: normal;
  font-weight: 600;
  color: var(--ink-1);
  border-color: rgba(120, 140, 160, 0.35);
}

.spine-era {
  position: absolute;
  left: 50%;
  transform: translate(-50%, calc(-50% - 18px));
  font-family: var(--serif);
  font-size: 10px;
  font-style: italic;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold-dim);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0.65;
}
body[data-theme='modern'] .spine-era {
  font-family: var(--sans);
  font-style: normal;
  color: var(--ink-3);
}

/* Region column — flanks the spine */
.spine-col {
  position: absolute;
  top: 0;
}

/* Column divider — fading hairline between adjacent same-side columns.
   DOM order: left side goes spine→outward (china first, safrica last);
              right side goes spine→outward (rome first, south-am last).
   So on left side the separator lives on the B column's right edge;
   on right side, the separator lives on the B column's left edge. */
.spine-col[data-side="left"] + .spine-col[data-side="left"]::before,
.spine-col[data-side="right"] + .spine-col[data-side="right"]::before {
  content: '';
  position: absolute;
  top: 2%;
  bottom: 2%;
  width: 1px;
  background: linear-gradient(to bottom,
    transparent 0%,
    var(--line-strong) 8%,
    var(--line-strong) 92%,
    transparent 100%);
  pointer-events: none;
  /* Civ blocks sit at z-index auto/positive; push divider above the stage
     but it will still be occluded where blocks occupy the same x pixels — which
     is fine since we only want it visible in the gaps between civ rectangles. */
  z-index: 2;
}
.spine-col[data-side="left"] + .spine-col[data-side="left"]::before  { right: 0; }
.spine-col[data-side="right"] + .spine-col[data-side="right"]::before { left: 0; }

/* Civ "leaf" — a horizontal block extending from the spine outward */
.spine-leaf {
  position: absolute;
  border-radius: 2px;
  cursor: pointer;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 3px 6px;
  box-sizing: border-box;
  transition: filter 0.15s, transform 0.15s;
  color: transparent;
}
.spine-leaf.dim { opacity: 0.22; filter: grayscale(0.6); }
/* Parallel-highlight: when a civ is selected, non-contemporaries fade to a whisper */
.spine-leaf.offbeat { opacity: 0.14; filter: grayscale(0.85); transition: opacity 0.3s, filter 0.3s; }
.spine-leaf.concurrent { box-shadow: 0 0 0 1px rgba(200,162,76,0.55), 0 0 14px rgba(200,162,76,0.22); z-index: 6; }
.spine-leaf.selected { outline: 1.5px solid var(--gold); outline-offset: 1px; z-index: 7; }
.spine-leaf:hover {
  filter: brightness(1.15) saturate(1.1);
  transform: scale(1.02);
  z-index: 5;
}
/* Predecessor → successor connectors. A delicate thread between lane blocks. */
.spine-pred-link {
  position: absolute;
  width: 1px;
  height: 1px;
  background-image: linear-gradient(to bottom, rgba(200,162,76,0.55) 50%, transparent 50%);
  background-size: 1px 5px;
  background-repeat: repeat-y;
  pointer-events: none;
  z-index: 2;
  opacity: 0.55;
}
.spine-pred-link.diag {
  height: 1px;
  background-image: linear-gradient(to right, rgba(200,162,76,0.55) 50%, transparent 50%);
  background-size: 5px 1px;
  background-repeat: repeat-x;
  transform-origin: 0 0;
}
body[data-theme='modern'] .spine-pred-link,
body[data-theme='modern'] .spine-pred-link.diag {
  background-image: linear-gradient(to bottom, rgba(140,160,180,0.5) 50%, transparent 50%);
}
body[data-theme='modern'] .spine-pred-link.diag {
  background-image: linear-gradient(to right, rgba(140,160,180,0.5) 50%, transparent 50%);
}
.spine-leaf.wide { box-shadow: 0 0 12px rgba(0,0,0,0.4); }

/* Vertical-text variant — narrow & tall leaves read top-to-bottom */
.spine-leaf.vert {
  flex-direction: column-reverse;
  align-items: center;
  justify-content: flex-start;
  padding: 5px 2px 6px;
  gap: 3px;
}
.leaf-name-v {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--serif);
  font-size: 11px;
  line-height: 1.02;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(255, 240, 210, 0.96);
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.55),
    0 0 1px rgba(0, 0, 0, 0.6);
  pointer-events: none;
  white-space: nowrap;
  overflow: hidden;
  max-height: 100%;
  text-overflow: clip;
}
/* Adaptive size tiers (Plan D) — picked in JS to guarantee fit */
.leaf-name-v.v-lg { font-size: 12px; letter-spacing: 0.08em; }
.leaf-name-v.v-md { font-size: 10px; letter-spacing: 0.05em; }
.leaf-name-v.v-sm { font-size: 9px; letter-spacing: 0.03em; font-weight: 500; }
.leaf-name-v.v-xs { font-size: 8px; letter-spacing: 0.02em; font-weight: 500; }
body[data-theme='modern'] .leaf-name-v {
  font-family: var(--sans);
  font-weight: 600;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
}
.leaf-dates-v {
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  color: rgba(255, 235, 200, 0.72);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  white-space: nowrap;
  align-self: center;
  margin-bottom: 2px;
}
body[data-theme='modern'] .leaf-dates-v {
  color: rgba(255, 255, 255, 0.74);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.leaf-name {
  font-family: var(--serif);
  font-size: 10px;
  line-height: 1.15;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--bg-deep);
  mix-blend-mode: screen;
  filter: brightness(1.8) contrast(1.2);
  pointer-events: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.leaf-name.h-lg { font-size: 10px; }
.leaf-name.h-md { font-size: 9px; letter-spacing: 0.01em; }
.leaf-name.h-sm { font-size: 8px; letter-spacing: 0; }
body[data-theme='modern'] .leaf-name {
  font-family: var(--sans);
  font-weight: 600;
  mix-blend-mode: normal;
  filter: none;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.35);
}
.leaf-dates {
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.05em;
  opacity: 0.55;
  color: var(--bg-deep);
  mix-blend-mode: screen;
  filter: brightness(1.8);
  pointer-events: none;
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
}
body[data-theme='modern'] .leaf-dates {
  mix-blend-mode: normal;
  filter: none;
  color: rgba(255,255,255,0.75);
}

/* Global events — diamond markers riveted onto the spine's side borders */
.spine-event {
  position: absolute;
  z-index: 4;
  display: flex;
  align-items: center;
  pointer-events: auto;
  cursor: pointer;
}
.sev-dot {
  width: 7px; height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 1.5px var(--bg-deep);
  flex-shrink: 0;
  opacity: 0.85;
  transition: all 0.18s ease;
}
.sev-tick {
  height: 1px;
  width: 14px;
  background: linear-gradient(to right, var(--gold-dim), transparent);
  opacity: 0.55;
  flex-shrink: 0;
  transition: opacity 0.18s ease;
}
.spine-event:hover .sev-dot {
  opacity: 1;
  box-shadow: 0 0 0 1.5px var(--bg-deep), 0 0 10px var(--gold);
  transform: rotate(45deg) scale(1.2);
}
.spine-event:hover .sev-tick { opacity: 0.9; }
.sev-label {
  font-family: var(--serif);
  font-size: 10.5px;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  font-style: italic;
  white-space: nowrap;
  max-width: 174px;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0.88;
  transition: color 0.18s ease, opacity 0.18s ease;
}
.sev-label em {
  font-family: var(--mono);
  font-style: normal;
  font-size: 9px;
  letter-spacing: 0.06em;
  opacity: 0.6;
  color: var(--gold-dim);
  margin-right: 7px;
  padding-right: 7px;
  border-right: 1px solid var(--line-mid);
}
.spine-event:hover .sev-label { opacity: 1; color: var(--gold); }
body[data-theme='modern'] .sev-label {
  font-family: var(--sans);
  font-style: normal;
  color: var(--ink-1);
}
body[data-theme='modern'] .sev-label em {
  font-family: var(--mono);
}

/* Spine column header (region name floated at top of each column) */
.spine-col-header {
  position: fixed;
  width: 120px;
  text-align: center;
}

/* Inline column header (inside each spine-col, at top) */
.spine-col-inline-header {
  position: sticky;
  top: 0;
  height: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: linear-gradient(to bottom, var(--bg-deep) 0%, var(--bg-deep) 70%, transparent 100%);
  z-index: 3;
  pointer-events: none;
}
.sch-primary {
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--gold);
}
.sch-secondary {
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 2px;
}
body[data-theme='modern'] .sch-primary {
  font-family: var(--sans);
  font-weight: 600;
  color: var(--ink-1);
}
body[data-theme='modern'] .sch-secondary {
  font-family: var(--sans);
  color: var(--ink-3);
}

.spine-lanes {
  position: absolute;
  left: 0; right: 0;
}

/* Event label side variants — dot sits ON the spine border line */
.spine-event.sev-left {
  flex-direction: row-reverse;
  transform: translate(calc(-100% + 3.5px), -50%);
  gap: 0;
}
.spine-event.sev-left .sev-label {
  text-align: right;
}
.spine-event.sev-left .sev-tick {
  background: linear-gradient(to left, var(--gold-dim), transparent);
}
.spine-event.sev-right {
  transform: translate(-3.5px, -50%);
  gap: 0;
}

/* Hide the horizontal region labels in swimlane/ridge mode by default — they're styled elsewhere */
body[data-view='spine'] .now-indicator {
  border-top: 1px dashed var(--gold);
  border-left: none;
}