/* ============================================================
   3D 数字校园 · 界面样式
   ============================================================ */
body.c3d{margin:0;overflow:hidden;background:#08161f;color:#f4f8fa}
.c3d canvas{display:block}

/* ---------- 加载屏 ---------- */
.loader{
  position:fixed;inset:0;z-index:500;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:26px;
  background:radial-gradient(circle at 50% 42%,#123a52 0%,#0a1c2b 55%,#071219 100%);
  transition:opacity .8s var(--e-out),visibility .8s;
}
.loader.is-done{opacity:0;visibility:hidden}
.loader-mark{
  font-family:var(--f-cn);font-weight:700;letter-spacing:.22em;
  font-size:clamp(1.6rem,5vw,2.8rem);color:#fff;
  opacity:0;animation:markIn 1.1s var(--e-out) .15s forwards;
}
.loader-sub{
  font-family:var(--f-en);font-size:.62rem;letter-spacing:.4em;text-transform:uppercase;
  color:rgba(255,255,255,.42);
  opacity:0;animation:markIn 1.1s var(--e-out) .35s forwards;
}
@keyframes markIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.loader-bar{
  width:min(320px,60vw);height:1px;background:rgba(255,255,255,.14);position:relative;overflow:hidden;
}
.loader-bar span{
  position:absolute;left:0;top:0;height:100%;width:0%;
  background:linear-gradient(90deg,#6fb0cf,#e86a3a);
  transition:width .4s var(--e-out);
}
.loader-pct{
  font-family:var(--f-en);font-size:.7rem;letter-spacing:.2em;color:rgba(255,255,255,.6);
  font-variant-numeric:tabular-nums;
}
.loader-status{
  font-family:var(--f-en);font-size:.6rem;letter-spacing:.24em;text-transform:uppercase;
  color:rgba(255,255,255,.32);
}
.loader-enter{
  margin-top:6px;padding:15px 34px;border-radius:100px;
  border:1px solid rgba(255,255,255,.34);color:#fff;
  font-family:var(--f-en);font-size:.78rem;letter-spacing:.16em;
  opacity:0;pointer-events:none;transition:opacity .6s var(--e-out),background .3s,transform .3s;
}
.loader-enter.is-on{opacity:1;pointer-events:auto}
.loader-enter:hover{background:rgba(255,255,255,.13);transform:translateY(-2px)}

/* ---------- HUD 通用 ---------- */
.hud{position:fixed;z-index:120;pointer-events:none}
.hud > *{pointer-events:auto}
.hud-tl{top:0;left:0;padding:clamp(16px,2.4vw,30px)}
.hud-tr{top:0;right:0;padding:clamp(16px,2.4vw,30px);display:flex;flex-direction:column;gap:12px;align-items:flex-end}
.hud-bl{bottom:0;left:0;padding:clamp(16px,2.4vw,30px);display:flex;flex-direction:column;gap:16px}
.hud-br{bottom:0;right:0;padding:clamp(16px,2.4vw,30px);text-align:right}
.hud-box{
  background:rgba(8,22,34,.5);
  -webkit-backdrop-filter:blur(16px) saturate(140%);backdrop-filter:blur(16px) saturate(140%);
  border:1px solid rgba(255,255,255,.14);border-radius:14px;
  padding:12px 16px;
}
.hud-title{font-size:clamp(.9rem,1.4vw,1.1rem);font-weight:600;letter-spacing:.06em;line-height:1.3}
.hud-sub{font-family:var(--f-en);font-size:.58rem;letter-spacing:.26em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-top:4px}
.hud-tag{
  display:inline-flex;align-items:center;gap:6px;margin-top:8px;
  font-family:var(--f-en);font-size:.56rem;letter-spacing:.16em;
  padding:3px 9px;border-radius:100px;background:rgba(232,106,58,.18);color:#ffb08a;
  border:1px solid rgba(232,106,58,.32);
}
.hud-label{
  font-family:var(--f-en);font-size:.56rem;letter-spacing:.2em;text-transform:uppercase;
  color:rgba(255,255,255,.45);margin-bottom:8px;display:block;
}
.hud-row{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.hud-btn{
  padding:8px 14px;border-radius:9px;
  border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.05);
  color:rgba(255,255,255,.82);
  font-family:var(--f-en);font-size:.64rem;letter-spacing:.12em;
  transition:background .3s,border-color .3s,color .3s,transform .25s;
}
.hud-btn:hover{background:rgba(255,255,255,.14);color:#fff;transform:translateY(-1px)}
.hud-btn.is-on{background:var(--coral);border-color:var(--coral);color:#fff}
.hud-btn.is-primary{background:rgba(232,106,58,.9);border-color:transparent;color:#fff;padding:10px 18px}
.hud-btn.is-primary:hover{background:var(--coral-bright)}
.hud-back{
  display:inline-flex;align-items:center;margin-top:12px;
  font-size:.72rem;letter-spacing:.08em;color:rgba(255,255,255,.62);
  transition:color .3s,transform .3s;
}
.hud-back:hover{color:#fff;transform:translateX(-3px)}

/* ---------- 创作者署名（右下） ---------- */
.hud-credit{pointer-events:auto;text-align:right}
.hud-credit-n{
  font-size:.74rem;font-weight:600;letter-spacing:.12em;
  color:rgba(255,255,255,.72);line-height:1.3;
}
.hud-credit-s{
  font-family:var(--f-en);font-size:.58rem;letter-spacing:.14em;
  color:rgba(255,255,255,.42);margin-top:3px;
}
.hud-credit-s a{color:rgba(255,255,255,.62);transition:color .3s}
.hud-credit-s a:hover{color:var(--coral)}

/* ---------- 环境（单一折叠面板） ---------- */
.env-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:100px;
  border:1px solid rgba(255,255,255,.2);
  background:rgba(8,22,34,.55);
  -webkit-backdrop-filter:blur(16px) saturate(140%);backdrop-filter:blur(16px) saturate(140%);
  color:rgba(255,255,255,.86);font-size:.82rem;letter-spacing:.14em;
  transition:background .3s,border-color .3s,color .3s,transform .25s;
}
.env-btn svg{opacity:.8}
.env-btn:hover{background:rgba(255,255,255,.14);color:#fff;transform:translateY(-1px)}
.env-btn.is-on{background:var(--coral);border-color:var(--coral);color:#fff}
.env-btn.is-on svg{opacity:1}

.env-panel{
  position:absolute;top:calc(100% + 10px);right:0;
  width:min(288px,calc(100vw - 32px));
  max-height:min(72vh,620px);overflow:auto;overscroll-behavior:contain;
  background:rgba(8,22,34,.72);
  -webkit-backdrop-filter:blur(22px) saturate(150%);backdrop-filter:blur(22px) saturate(150%);
  border:1px solid rgba(255,255,255,.16);border-radius:18px;
  padding:16px;
  opacity:0;visibility:hidden;transform:translateY(-8px) scale(.98);transform-origin:top right;
  transition:opacity .38s var(--e-out),transform .38s var(--e-out),visibility .38s;
}
.env-panel.is-on{opacity:1;visibility:visible;transform:none}

.env-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px}
.env-head-t{font-family:var(--f-en);font-size:.56rem;letter-spacing:.24em;
  text-transform:uppercase;color:rgba(255,255,255,.45)}
.env-close{
  width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.08);color:rgba(255,255,255,.8);transition:background .3s,transform .3s;
}
.env-close:hover{background:var(--coral);color:#fff;transform:rotate(90deg)}

.env-sec{padding:12px 0;border-top:1px solid rgba(255,255,255,.1)}
.env-sec:first-child{border-top:0}
.env-sec-t{
  display:block;font-family:var(--f-en);font-size:.56rem;letter-spacing:.2em;
  text-transform:uppercase;color:rgba(255,255,255,.42);margin-bottom:10px;
}
.env-row{display:flex;flex-direction:column;gap:8px}
.env-row + .env-row{margin-top:8px}
.env-col{align-items:stretch}
.env-label{font-size:.72rem;color:rgba(255,255,255,.55)}
.env-btns{display:flex;flex-wrap:wrap;gap:6px}
.env-b{
  padding:7px 12px;border-radius:8px;
  border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.05);
  color:rgba(255,255,255,.78);font-size:.74rem;letter-spacing:.04em;
  transition:background .25s,border-color .25s,color .25s,transform .2s;
}
.env-b:hover{background:rgba(255,255,255,.13);color:#fff;transform:translateY(-1px)}
.env-b.is-on{background:var(--coral);border-color:var(--coral);color:#fff}
.env-b.env-wide{flex:1 1 100%;text-align:center;padding:9px 12px}

.env-range{
  width:100%;height:2px;-webkit-appearance:none;appearance:none;
  background:rgba(255,255,255,.2);border-radius:2px;outline:none;cursor:pointer;
}
.env-range::-webkit-slider-thumb{
  -webkit-appearance:none;width:13px;height:13px;border-radius:50%;
  background:var(--coral);cursor:pointer;box-shadow:0 0 0 3px rgba(232,106,58,.2);
}
.env-range::-moz-range-thumb{
  width:13px;height:13px;border-radius:50%;background:var(--coral);cursor:pointer;border:0;
}
.env-val{font-family:var(--f-en);font-size:.9rem;letter-spacing:.06em;color:#fff;
  font-variant-numeric:tabular-nums}

.env-tips{
  margin-top:14px;padding-top:12px;border-top:1px solid rgba(255,255,255,.1);
  display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;
}
.env-tips span{font-size:.66rem;color:rgba(255,255,255,.38);line-height:1.6}
.env-tips b{color:rgba(255,255,255,.6);font-weight:400}

/* ---------- 小地图 ---------- */
.minimap{
  width:clamp(132px,17vw,178px);aspect-ratio:1;
  background:rgba(8,22,34,.55);border:1px solid rgba(255,255,255,.14);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-radius:12px;overflow:hidden;position:relative;
}
.minimap svg{width:100%;height:100%;display:block}
.mm-cam{transition:transform .12s linear}

/* ---------- POI 标签 ---------- */
.poi-layer{position:fixed;inset:0;z-index:110;pointer-events:none;overflow:hidden}
.poi{
  position:absolute;transform:translate(-50%,-50%);
  display:flex;align-items:center;gap:7px;padding:5px 11px;border-radius:100px;
  background:rgba(8,22,34,.6);border:1px solid rgba(255,255,255,.18);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  font-family:var(--f-en);font-size:.58rem;letter-spacing:.14em;color:#fff;
  white-space:nowrap;pointer-events:auto;cursor:pointer;
  transition:background .3s,border-color .3s,opacity .3s,transform .3s var(--e-out);
}
.poi:hover,.poi.is-on{background:rgba(232,106,58,.85);border-color:rgba(255,255,255,.5)}
.poi .dot{width:5px;height:5px;border-radius:50%;background:var(--coral);flex-shrink:0}
.poi.is-on .dot{background:#fff}
.poi.hidden{opacity:0;pointer-events:none}

/* ---------- 信息面板 ---------- */
.info{
  position:fixed;z-index:130;top:50%;right:clamp(16px,2.4vw,30px);
  transform:translateY(-50%) translateX(30px);
  width:min(360px,calc(100vw - 32px));max-height:76vh;overflow:auto;
  background:rgba(8,22,34,.72);
  -webkit-backdrop-filter:blur(22px) saturate(150%);backdrop-filter:blur(22px) saturate(150%);
  border:1px solid rgba(255,255,255,.16);border-radius:20px;
  padding:clamp(20px,2.6vw,30px);
  opacity:0;visibility:hidden;
  transition:opacity .5s var(--e-out),transform .55s var(--e-out),visibility .5s;
}
.info.is-on{opacity:1;visibility:visible;transform:translateY(-50%) translateX(0)}
.info-tag{
  display:inline-flex;gap:6px;align-items:center;
  font-family:var(--f-en);font-size:.55rem;letter-spacing:.16em;
  padding:4px 10px;border-radius:100px;background:rgba(232,106,58,.2);
  color:#ffb08a;border:1px solid rgba(232,106,58,.34);
}
.info h3{font-size:clamp(1.2rem,2.2vw,1.6rem);font-weight:700;margin-top:14px;line-height:1.25}
.info .en{font-family:var(--f-en);font-size:.6rem;letter-spacing:.22em;text-transform:uppercase;color:rgba(255,255,255,.45);margin-top:6px}
.info-img{margin-top:16px;border-radius:12px;overflow:hidden;aspect-ratio:16/10;background:#0d2436}
.info-img img{width:100%;height:100%;object-fit:cover}
.info p.txt{font-size:.88rem;line-height:1.9;color:rgba(255,255,255,.72);margin-top:16px}
.info .meta{margin-top:16px;padding-top:14px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:8px 18px}
.info .meta span{font-size:.72rem;color:rgba(255,255,255,.5)}
.info-note{
  margin-top:12px;padding:10px 12px;border-radius:10px;
  background:rgba(255,255,255,.05);border-left:2px solid rgba(232,106,58,.6);
  font-size:.74rem;line-height:1.8;color:rgba(255,255,255,.56);
}
.info-acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.info-close{
  position:absolute;top:14px;right:14px;width:32px;height:32px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.08);color:#fff;transition:background .3s,transform .3s;
}
.info-close:hover{background:var(--coral);transform:rotate(90deg)}

/* ---------- 漫游字幕 ---------- */
.tour-cap{
  position:fixed;z-index:125;left:50%;bottom:clamp(80px,12vh,140px);
  transform:translateX(-50%) translateY(14px);
  text-align:center;pointer-events:none;
  opacity:0;transition:opacity .7s var(--e-out),transform .7s var(--e-out);
}
.tour-cap.is-on{opacity:1;transform:translateX(-50%) translateY(0)}
.tour-cap .n{font-family:var(--f-en);font-size:.58rem;letter-spacing:.24em;color:rgba(255,255,255,.5)}
.tour-cap .t{font-size:clamp(1.3rem,3.4vw,2.2rem);font-weight:700;margin-top:8px;
  text-shadow:0 4px 30px rgba(0,0,0,.6);letter-spacing:.02em}
.tour-cap .d{font-size:.9rem;color:rgba(255,255,255,.72);margin-top:8px;max-width:44ch;
  text-shadow:0 2px 16px rgba(0,0,0,.6)}
.tour-ctl{
  position:fixed;z-index:126;left:50%;bottom:clamp(24px,4vh,40px);transform:translateX(-50%);
  display:flex;gap:8px;align-items:center;
  background:rgba(8,22,34,.62);border:1px solid rgba(255,255,255,.14);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-radius:100px;padding:7px 10px;
  opacity:0;visibility:hidden;transition:opacity .5s,visibility .5s;
}
.tour-ctl.is-on{opacity:1;visibility:visible}
.tour-prog{width:90px;height:2px;background:rgba(255,255,255,.18);border-radius:2px;overflow:hidden;margin:0 6px}
.tour-prog span{display:block;height:100%;width:0%;background:var(--coral);transition:width .5s linear}

/* ---------- 彩蛋 ---------- */
.star-toast{
  position:fixed;z-index:400;left:50%;top:50%;transform:translate(-50%,-50%) scale(.94);
  max-width:min(520px,88vw);padding:clamp(28px,4vw,44px);border-radius:22px;text-align:center;
  background:rgba(8,22,34,.94);border:1px solid rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  opacity:0;visibility:hidden;transition:opacity .5s var(--e-out),transform .5s var(--e-out),visibility .5s;
}
.star-toast.is-on{opacity:1;visibility:visible;transform:translate(-50%,-50%) scale(1)}
.star-toast p{font-size:clamp(1rem,1.9vw,1.4rem);line-height:1.8;font-weight:300}
.star-toast .en{font-family:var(--f-en);font-size:.62rem;letter-spacing:.24em;
  text-transform:uppercase;color:rgba(255,255,255,.45);margin-top:14px;display:block}
.star-toast button{margin-top:22px;padding:12px 28px;border-radius:100px;
  border:1px solid rgba(255,255,255,.3);color:#fff;font-family:var(--f-en);font-size:.74rem;letter-spacing:.12em}
.star-toast button:hover{background:rgba(255,255,255,.14)}

@media (max-width:820px){
  .minimap{width:104px}
  .env-btn{padding:9px 14px;font-size:.78rem}
  .env-panel{width:min(272px,calc(100vw - 24px));max-height:64vh}
  .env-tips{grid-template-columns:1fr}
  .info{top:auto;bottom:0;right:0;left:0;width:100%;max-height:54vh;
    transform:translateY(100%);border-radius:22px 22px 0 0;border-left:0;border-right:0;border-bottom:0}
  .info.is-on{transform:translateY(0)}
  .hud-tl{padding:12px}
  .hud-bl{padding:12px}
  .tour-cap{bottom:clamp(120px,20vh,170px)}
}
@media (max-width:420px){
  .hud-title{font-size:.86rem}
  .hud-btn{padding:7px 11px;font-size:.58rem}
  .minimap{width:88px}
}

@media (prefers-reduced-motion:reduce){
  .env-panel,.info,.poi,.tour-cap{transition-duration:.01ms}
}