:root {
  --bg: #0a0e1f;
  --panel: #141b2e;
  --text: #ffffff;
  --muted: #8b9dc3;
  --primary: #7c3aed;       /* 优雅紫色 */
  --primary-dark: #6d28d9;
  --accent: #06b6d4;        /* 青绿色 */
  --highlight: #fbbf24;     /* 金色 */
  --danger: #ef4444;
  --ring: rgba(124, 58, 237, 0.4);
  --gradient-start: #1e1b4b;
  --gradient-mid: #312e81;
  --gradient-end: #1e293b;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(1400px 700px at 20% 10%, var(--gradient-start), var(--bg)),
    radial-gradient(1000px 600px at 75% 85%, var(--gradient-mid), transparent),
    radial-gradient(800px 400px at 15% 75%, rgba(124,58,237,.15), transparent),
    radial-gradient(600px 300px at 85% 20%, rgba(6,182,212,.12), transparent);
  color: var(--text);
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

.app-header {
  padding: 20px 24px;
}
.app-header h1 {
  margin: 0;
  font-size: 22px;
}
.app-header .subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  padding: 0 16px 16px;
}

.panel {
  background: linear-gradient(180deg, rgba(20,27,46,.96), rgba(20,27,46,.85));
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  box-shadow: 0 12px 32px rgba(0,0,0,.4), 0 0 0 1px rgba(124,58,237,.1);
}

.left { padding: 16px; }
.stage { position: relative; overflow: hidden; }

.import { margin-bottom: 16px; }
.file-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(124,58,237,.2), rgba(6,182,212,.15));
  border: 1px solid rgba(124,58,237,.3);
  color: var(--text);
  cursor: pointer;
  user-select: none;
  transition: all 0.3s ease;
}
.file-btn:hover {
  background: linear-gradient(135deg, rgba(124,58,237,.3), rgba(6,182,212,.25));
  border-color: rgba(124,58,237,.5);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(124,58,237,.3);
}
.file-btn input { display: none; }

.drop-zone {
  margin-top: 10px;
  padding: 14px;
  border: 1px dashed rgba(255,255,255,0.18);
  border-radius: 10px;
  text-align: center;
  color: var(--muted);
}
.drop-zone.dragover {
  border-color: var(--primary);
  background: rgba(124,58,237,.15);
  box-shadow: 0 0 0 4px var(--ring), 0 8px 24px rgba(124,58,237,.2);
}

.stats { margin-top: 8px; color: var(--muted); }
#count {
  font-weight: bold;
  color: var(--primary);
}
.hint { margin-top: 6px; color: var(--muted); font-size: 12px; }

.controls { margin-top: 10px; }
.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.control-row input[type="number"] {
  width: 120px;
  padding: 8px 10px;
  color: var(--text);
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.08);
}
.checkbox { color: var(--muted); }

.buttons { display: flex; gap: 10px; align-items: center; justify-content: center; margin-top: 16px; }
.btn {
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  color: var(--text);
  cursor: pointer;
}
.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  box-shadow: 0 4px 16px rgba(124,58,237,.4);
  transition: all 0.3s ease;
}
.btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124,58,237,.5);
}
.btn.ghost:hover { 
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.2);
}

.results { margin-top: 16px; }
.results h3 { margin: 0 0 8px; font-size: 16px; }
.results-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.results-list li {
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14);
}

.stage-root { position: relative; width: 100%; height: 100%; min-height: 80vh; }
.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 350px at 80% 20%, rgba(6,182,212,.18), transparent),
    radial-gradient(900px 500px at 10% 80%, rgba(124,58,237,.18), transparent),
    radial-gradient(400px 250px at 50% 50%, rgba(251,191,36,.08), transparent);
  pointer-events: none;
}

canvas { display: block; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .stage-root { min-height: 80vh; }
  .results-list { grid-template-columns: 1fr; }
}

/* 居中覆盖层：在3D舞台中央显示人数 */
.center-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 2;
}
.center-overlay .count {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  text-shadow: 0 4px 24px rgba(0,0,0,.45);
  filter: drop-shadow(0 10px 20px rgba(0,0,0,.35));
  font-size: clamp(42px, 9vw, 120px);
}
.center-overlay .count .unit { font-size: 0.35em; color: var(--muted); }
.overlay-label {
  position: absolute;
  top: 18px;
  right: 20px;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
  color: var(--text);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
}

/* 不同状态的配色 */
.center-overlay[data-mode="config"] .count { color: #a5b4fc; }
.center-overlay[data-mode="shuffling"] .count {
  color: var(--primary);
  animation: pulse 1.2s ease-in-out infinite;
  text-shadow: 0 0 30px rgba(124,58,237,.6), 0 0 60px rgba(6,182,212,.4);
}
.center-overlay[data-mode="selected"] .count { display: none; }
/* 结果状态允许中心层接收点击 */
.center-overlay[data-mode="selected"] { pointer-events: auto; }
/* 选中结果时隐藏右上标签与旧的文字列表，确保中间只显示四槽位 */
.center-overlay[data-mode="selected"] .overlay-label { display: none; }
.center-overlay[data-mode="selected"] .overlay-names { display: none; }

/* 中心姓名列表 */
.overlay-names {
  margin-top: 10px;
  display: grid;
  place-items: center;
  gap: 6px;
  filter: drop-shadow(0 10px 20px rgba(0,0,0,.35));
}
.overlay-names .name {
  font-weight: 800;
  letter-spacing: 0.5px;
  font-size: clamp(24px, 6vw, 56px);
  color: var(--highlight);
  opacity: 0;
  transform: translateY(12px) scale(.98);
  animation: nameIn .38s ease forwards;
}
.overlay-names .name:nth-child(2) { animation-delay: .08s; }
.overlay-names .name:nth-child(3) { animation-delay: .16s; }
.overlay-names .name:nth-child(4) { animation-delay: .24s; }
.center-overlay:not([data-mode="selected"]) .overlay-names { display: none; }

@keyframes nameIn {
  0% { opacity: 0; transform: translateY(12px) scale(.98); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* 居中四槽位显示框 */
 .overlay-slots { position: absolute; inset: 0; pointer-events: auto; display: flex; align-items: center; justify-content: center; }
.overlay-slots .slot {
  position: absolute;
  min-width: 220px;
  min-height: 80px;
  padding: 16px 20px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text);
  font-weight: 800;
  font-size: clamp(22px, 4.5vw, 36px);
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.25);
  background: linear-gradient(180deg, rgba(255,255,255,.16), rgba(255,255,255,.1));
  box-shadow: 0 12px 32px rgba(0,0,0,.45), inset 0 0 40px rgba(124,58,237,.2), 0 0 20px rgba(6,182,212,.15);
  opacity: 0; transform: translate(calc(-50% + var(--x, 0px)), calc(-50% + var(--y, 0px))) scale(.98);
  animation: slotIn .32s ease forwards;
   cursor: pointer; user-select: none;
   transition: all 0.3s ease;
}
.overlay-slots .slot:hover {
  transform: translate(calc(-50% + var(--x, 0px)), calc(-50% + var(--y, 0px))) scale(1.05);
  box-shadow: 0 16px 40px rgba(0,0,0,.5), inset 0 0 50px rgba(124,58,237,.3), 0 0 30px rgba(6,182,212,.25);
}
 .overlay-slots .slot .name { color: var(--highlight); text-shadow: 0 0 20px rgba(251,191,36,.8), 0 2px 8px rgba(0,0,0,.3); }
 .overlay-slots .slot.confirmed {
   border-color: var(--highlight);
   box-shadow: 0 12px 32px rgba(0,0,0,.5), inset 0 0 50px rgba(251,191,36,.35), 0 0 25px rgba(251,191,36,.4);
 }

@keyframes slotIn {
  0% { opacity: 0; transform: translate(calc(-50% + var(--x, 0px)), calc(-50% + var(--y, 0px))) scale(.98); }
  100% { opacity: 1; transform: translate(calc(-50% + var(--x, 0px)), calc(-50% + var(--y, 0px))) scale(1); }
}

.center-overlay:not([data-mode="selected"]) .overlay-slots { display: none; }

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.06); }
  100% { transform: scale(1); }
}