:root {
  --ink: #4a4540;
  --ink-soft: #8d8680;
  --line: rgba(74, 69, 64, 0.14);
  --panel: rgba(255, 255, 255, 0.82);
  --accent: #7d9fc4;
  --accent-soft: rgba(125, 159, 196, 0.14);
  --radius: 14px;
  --shadow: 0 6px 22px rgba(90, 80, 70, 0.10), 0 1px 3px rgba(90, 80, 70, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: #fff;
  color: var(--ink);
  font: 14px/1.5 "Inter", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#gl {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: grab;
}
#gl.dragging { cursor: grabbing; }

/* ---------------- floating HUD ---------------- */
.hud {
  position: fixed;
  z-index: 10;
  pointer-events: none;
}
.hud > * { pointer-events: auto; }

/* view preset pills */
.hud-views {
  top: 26px;
  right: 30px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-end;
}
.hud-views button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--ink-soft);
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s, transform .18s;
  white-space: nowrap;
}
.hud-views button:hover {
  color: var(--ink);
  border-color: rgba(74, 69, 64, 0.28);
  transform: translateX(-2px);
}
.hud-views button.on {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

/* bottom tools */
.hud-tools {
  bottom: 26px;
  right: 30px;
  display: flex;
  gap: 8px;
}
.tool {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--ink-soft);
  font: inherit;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 13px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: color .18s, border-color .18s, background .18s;
}
.tool svg { width: 14px; height: 14px; fill: currentColor; }
.tool:hover { color: var(--ink); border-color: rgba(74, 69, 64, 0.28); }
.tool.on { color: #fff; background: var(--accent); border-color: var(--accent); }

/* bottom hint */
.hud-hint {
  bottom: 30px;
  left: 30px;
  display: flex;
  gap: 16px;
  font-size: 11.5px;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
}
.hud-hint b { font-weight: 600; color: var(--ink); }
#stats { color: rgba(141, 134, 128, 0.7); }

/* ---------------- waiting screen ---------------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 44px;
  background:
    radial-gradient(120% 90% at 50% 0%, #ffffff 0%, #fbfaf9 60%, #f5f3f1 100%);
  transition: opacity .6s ease, visibility .6s;
}
.loader.gone { opacity: 0; visibility: hidden; pointer-events: none; }

/* ---- 缓慢旋转的等距小房间 ---- */
.stage {
  width: 128px;
  height: 128px;
  perspective: 620px;
  display: grid;
  place-items: center;
}
.iso {
  position: relative;
  width: 76px;
  height: 76px;
  transform-style: preserve-3d;
  animation: iso-spin 9s linear infinite;
}
.iso > i { position: absolute; inset: 0; display: block; }
/* 六个面，明度按受光关系排开，转起来才有体积感 */
.f-top    { background: #eae5dd; transform: rotateX(90deg)  translateZ(38px); }
.f-bottom { background: #b4ada2; transform: rotateX(-90deg) translateZ(38px); }
.f-front  { background: #d6d0c6; transform: translateZ(38px); }
.f-back   { background: #cdc7bd; transform: rotateY(180deg) translateZ(38px); }
.f-left   { background: #c3bcb1; transform: rotateY(-90deg) translateZ(38px); }
.f-right  { background: #ded8cf; transform: rotateY(90deg)  translateZ(38px); }
.iso::after {                       /* 地面上的柔和投影 */
  content: "";
  position: absolute;
  left: -18px; right: -18px;
  bottom: -26px; height: 24px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(120, 110, 100, .20), transparent 70%);
  transform: rotateX(90deg);
}
@keyframes iso-spin {
  from { transform: rotateX(-22deg) rotateY(0deg); }
  to   { transform: rotateX(-22deg) rotateY(360deg); }
}

/* ---- 进度环 ---- */
.load-info { text-align: center; }
.ring {
  position: relative;
  width: 132px;
  height: 132px;
  margin: 0 auto 22px;
}
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 4; stroke-linecap: round; }
.ring-bg { stroke: rgba(125, 159, 196, 0.16); }
.ring-fg {
  stroke: var(--accent);
  stroke-dasharray: 364.4;          /* 2πr, r = 58 */
  stroke-dashoffset: 364.4;
  transition: stroke-dashoffset .35s cubic-bezier(.25, .8, .35, 1);
}
.ring-pct {
  position: absolute;
  inset: 0;
  /* 必须用 flex：用 grid 的话数字（匿名文本节点）和 <span>%</span>
     会被当成两个网格项，竖着排成两行 */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 26px;
  font-weight: 300;
  letter-spacing: 0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.ring-pct span {
  font-size: 13px;
  color: var(--ink-soft);
  transform: translateY(5px);
}

.load-title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.10em;
  color: var(--ink);
}
.load-sub {
  margin: 0;
  font-size: 12.5px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  min-height: 1.4em;
  font-variant-numeric: tabular-nums;
}
.load-tip {
  margin: 18px 0 0;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: rgba(141, 134, 128, 0.62);
}

/* 网络慢的时候提示一下 */
.loader.slow .load-sub { color: #b08a5a; }

/* 出错时换掉配色 */
.loader.failed .ring-fg { stroke: #c07d7d; }
.loader.failed .ring-pct { font-size: 15px; }
.loader.failed .load-title { color: #a3625f; }

@media (max-width: 860px) {
  .loader { gap: 30px; }
  .stage { width: 96px; height: 96px; }
  .iso { width: 58px; height: 58px; }
  .f-top    { transform: rotateX(90deg)  translateZ(29px); }
  .f-bottom { transform: rotateX(-90deg) translateZ(29px); }
  .f-front  { transform: translateZ(29px); }
  .f-back   { transform: rotateY(180deg) translateZ(29px); }
  .f-left   { transform: rotateY(-90deg) translateZ(29px); }
  .f-right  { transform: rotateY(90deg)  translateZ(29px); }
  .ring { width: 108px; height: 108px; }
  .ring-pct { font-size: 22px; }
}

/* ?hold 调试模式的提示条 —— 必须显眼，否则会被误认为卡死 */
.debug-flag {
  position: absolute;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);
  padding: 10px 20px;
  border-radius: 14px;
  background: rgba(176, 138, 90, 0.10);
  border: 1px solid rgba(176, 138, 90, 0.38);
  color: #8a6a3a;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  text-align: center;
  white-space: nowrap;
}
.debug-flag span { opacity: 0.75; font-size: 11.5px; }
.debug-flag code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 11.5px;
  background: rgba(176, 138, 90, 0.16);
  padding: 1px 5px;
  border-radius: 4px;
}

/* 加载失败时，给个去小恐龙的出口 */
.error-alt {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(141, 134, 128, 0.18);
  font-size: 12.5px;
  color: var(--ink-soft);
}
.error-alt a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(125, 159, 196, 0.45);
  padding-bottom: 1px;
}
.error-alt a:hover { border-bottom-color: var(--accent); }

/* ---------------- 断网提示 ---------------- */
.offline {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(120% 90% at 50% 0%, #ffffff 0%, #fbfaf9 62%, #f4f2f0 100%);
}
.offline[hidden] { display: none; }

.offline-card {
  width: min(430px, 100%);
  padding: 42px 34px 30px;
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 2px 4px rgba(90, 80, 70, .04), 0 18px 50px rgba(90, 80, 70, .11);
  text-align: center;
  animation: card-in .5s cubic-bezier(.2, .8, .3, 1) both;
}
@keyframes card-in {
  from { opacity: 0; transform: translateY(16px) scale(.965); }
  to   { opacity: 1; transform: none; }
}

.offline-icon {
  width: 70px;
  height: 62px;
  color: var(--ink);
  margin-bottom: 18px;
  animation: dino-bob 2.6s ease-in-out infinite;
}
@keyframes dino-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-5px); }
}

.offline-title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink);
}
.offline-sub {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}
.offline-ask {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--ink);
}

.offline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 26px;
}
.offline-btn {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid rgba(141, 134, 128, .24);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
  line-height: 1;
  padding: 11px 24px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: background .18s, border-color .18s, transform .12s;
}
.offline-btn:hover { background: #faf9f8; border-color: rgba(141, 134, 128, .42); }
.offline-btn:active { transform: scale(.97); }
.offline-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(125, 159, 196, .30);
}
.offline-btn.primary:hover { filter: brightness(1.06); background: var(--accent); }

.offline-note {
  margin: 20px 0 0;
  font-size: 11.5px;
  letter-spacing: .04em;
  color: rgba(141, 134, 128, .62);
}

@media (max-width: 480px) {
  .offline-card { padding: 34px 24px 26px; }
  .offline-icon { width: 58px; height: 52px; }
  .offline-actions { flex-direction: column; }
  .offline-btn { justify-content: center; }
}

/* ================= 可交互物件的浮层 ================= */
.pane {
  position: fixed;
  inset: 0;
  z-index: 45;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(48, 44, 40, .36);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  animation: pane-in .2s ease both;
}
.pane[hidden] { display: none; }
/* 起点不用 0，避免中途抓帧时整层看不见 */
@keyframes pane-in { from { opacity: .35; } to { opacity: 1; } }

.pane-x {
  position: absolute;
  top: 12px;
  right: 14px;
  /* 必须显式抬高：.pc-inner 有 z-index:1，不设的话会把关闭按钮盖住，
     点击事件全被内层截走，表现就是「× 点不掉」 */
  z-index: 3;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: currentColor;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  opacity: .55;
  transition: opacity .18s, background .18s;
}
.pane-x:hover { opacity: 1; background: rgba(120, 110, 100, .14); }

/* ---------------- 书本 ---------------- */
.book {
  position: relative;
  display: grid;
  grid-template-columns: 208px 1fr;
  width: min(780px, 100%);
  max-height: min(86vh, 640px);
  border-radius: 4px 14px 14px 4px;
  background: #fdfcf9;
  box-shadow: 0 30px 80px rgba(40, 34, 28, .36), 0 0 0 1px rgba(90, 80, 70, .05);
  overflow: hidden;
  animation: book-in .45s cubic-bezier(.2, .8, .3, 1) both;
}
/* 只做位移，不改透明度 ——
   透明度动画在某些渲染时序下会停在中间态，卡片看着发虚。
   内容型浮层必须一出现就是实的。 */
@keyframes book-in {
  from { transform: translateY(18px) scale(.965); }
  to   { transform: none; }
}
.book-side {
  padding: 36px 24px 28px;
  background: linear-gradient(158deg, #f4eee4 0%, #e9e0d1 100%);
  border-right: 1px solid rgba(90, 80, 70, .10);
}
.book-kicker {
  margin: 0 0 16px;
  font-size: 10.5px;
  letter-spacing: .22em;
  color: #a3937f;
}
.book-name {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .04em;
  color: #3d352c;
}
.book-role {
  margin: 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: #8b7c69;
}
.book-rule {
  height: 1px;
  margin: 20px 0;
  background: rgba(140, 125, 105, .25);
}
.book-note {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.9;
  color: #9b8d7a;
}
.book-main {
  padding: 36px 34px;
  overflow-y: auto;
  color: #4a4239;
}
.book-p {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 2;
  letter-spacing: .02em;
  color: #5b5248;
}
.book-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px dashed rgba(140, 125, 105, .28);
}
.book-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 2px;
  border-bottom: 1px dashed rgba(140, 125, 105, .20);
  font-size: 12.5px;
}
.book-list span { color: #9b8d7a; letter-spacing: .06em; }
.book-list b { font-weight: 500; color: #4a4239; }

/* ---------------- 电脑屏幕（浅色，和房间同一套配色） ---------------- */
.pc {
  position: relative;
  width: min(430px, 100%);
  border-radius: 16px;
  background: linear-gradient(165deg, #fefcf6 0%, #f7f0e2 100%);
  box-shadow: 0 26px 64px rgba(90, 80, 70, .22), 0 0 0 1px rgba(74, 69, 64, .07);
  color: var(--ink);
  overflow: hidden;
  animation: pc-in .4s cubic-bezier(.2, .8, .3, 1) both;
}
@keyframes pc-in {
  from { transform: translateY(16px) scale(.97); }
  to   { transform: none; }
}
/* 屏幕「点亮」的那一下 */
.pc::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(70% 50% at 50% 28%, rgba(125, 159, 196, .20), transparent 70%);
  animation: pc-wake .9s ease both;
}
@keyframes pc-wake {
  from { opacity: 0; }
  40%  { opacity: 1; }
  to   { opacity: .45; }
}
.pc-inner {
  position: relative;
  z-index: 1;
  padding: 44px 38px 34px;
  text-align: center;
}
/* 右上角的叉：跟房间的浅蓝一致 */
.pc .pane-x { color: var(--accent); }
.pc-avatar {
  width: 66px;
  height: 66px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 10px;
  letter-spacing: 0;
  color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px rgba(125, 159, 196, .30);
}
.pc-user {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--ink);
}
.pc-tip {
  margin: 0 0 22px;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--ink-soft);
}
.pc-form { display: flex; gap: 8px; }
.pc-form input {
  flex: 1;
  min-width: 0;
  padding: 11px 14px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  letter-spacing: .12em;
  outline: none;
  transition: border-color .18s, box-shadow .18s;
}
.pc-form input:focus {
  border-color: rgba(125, 159, 196, .60);
  box-shadow: 0 0 0 3px rgba(125, 159, 196, .14);
}
.pc-form input::placeholder { color: rgba(141, 134, 128, .55); letter-spacing: .04em; }
.pc-form button {
  padding: 11px 20px;
  border: 0;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  letter-spacing: .06em;
  box-shadow: 0 4px 14px rgba(125, 159, 196, .30);
  transition: filter .18s, transform .12s;
}
.pc-form button:hover { filter: brightness(1.07); }
.pc-form button:active { transform: scale(.97); }
.pc-err {
  margin: 14px 0 0;
  font-size: 11.5px;
  letter-spacing: .04em;
  color: #b8797a;
}
.pc-err[hidden] { display: none; }
.pc-esc {
  margin: 18px 0 0;
  font-size: 10.5px;
  letter-spacing: .06em;
  color: rgba(141, 134, 128, .66);
}
.pc-esc b { font-weight: 600; color: var(--ink-soft); }
.pc.shake { animation: pc-shake .4s ease; }@keyframes pc-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  45% { transform: translateX(6px); }
  70% { transform: translateX(-3px); }
}

.hint-pick b { color: var(--accent); }

@media (max-width: 720px) {
  .book { grid-template-columns: 1fr; max-height: 84vh; }
  .book-side { padding: 26px 22px 20px; border-right: 0; border-bottom: 1px solid rgba(90, 80, 70, .10); }
  .book-main { padding: 24px 22px; }
}

/* ---------------- error ---------------- */
.error {
  position: fixed;
  z-index: 50;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: 460px;
  padding: 22px 26px;
  border: 1px solid rgba(192, 118, 118, 0.35);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow);
  font-size: 13px;
  line-height: 1.7;
  color: #8a5252;
}
.error b { display: block; margin-bottom: 6px; color: #7a4444; }
.error code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  background: rgba(138, 82, 82, 0.08);
  padding: 1px 5px;
  border-radius: 4px;
}

@media (max-width: 860px) {
  .hud-views { right: 18px; top: 18px; }
  .hud-tools { right: 18px; bottom: 18px; }
  .hud-hint { left: 18px; bottom: 18px; }
  .hud-hint span:not(:first-child) { display: none; }
  .tool span { display: none; }
  .tool { padding: 9px; }
}