/* ============================================================
   曹冲称象 · 等量代换 —— 国风绘本风设计系统
   平板优先 · 大触控目标 · 宣纸质感 · 朱砂/黛蓝/鎏金
   ============================================================ */
@font-face{
  font-family:"KuaiLe";
  src:url("../assets/ZCOOLKuaiLe.ttf") format("truetype");
  font-display:swap;
}
:root{
  --paper:#f7f0dd; --paper2:#fdf8ea; --ink:#2e3a3f; --ink-soft:#5b6b70;
  --teal:#2f6d7d; --teal-deep:#1f4e5a; --cinnabar:#c8553d; --cinnabar-deep:#a03e2b;
  --gold:#d9a441; --gold-soft:#f0d9a8; --jade:#7aa874; --water:#8fc1c9;
  --line:#e3d3ae; --shadow:0 10px 30px rgba(64,48,20,.14);
  --r-lg:22px; --r-md:16px; --r-sm:10px;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-disp:"KuaiLe","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0;overflow:hidden;background:#20414b}
body{font-family:var(--font-body);color:var(--ink)}
button{font:inherit;border:0;cursor:pointer;touch-action:manipulation;color:inherit;background:none}
input,textarea{font:inherit;color:inherit}
#app{position:fixed;inset:0;overflow:hidden}

/* ---------- 幻灯片框架 ---------- */
.slide{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:linear-gradient(160deg,#fbf3df 0%,#f4e6c6 55%,#dfd9bd 100%);
  opacity:0;visibility:hidden;transform:translateX(40px) scale(.985);
  transition:opacity .45s ease,transform .45s ease,visibility 0s .45s;
  padding:max(14px,env(safe-area-inset-top)) 16px max(76px,env(safe-area-inset-bottom)) 16px;
}
.slide.is-active{opacity:1;visibility:visible;transform:none;transition:opacity .45s ease,transform .45s ease,visibility 0s}
.slide.is-left{transform:translateX(-40px) scale(.985)}
.art-frame{position:absolute;inset:0;overflow:hidden}
.art-frame svg{width:100%;height:100%;display:block}

/* ---------- 通用按钮 ---------- */
.btn-primary{
  background:linear-gradient(180deg,#d96248,#c1452f);color:#fff;font-weight:700;
  padding:14px 34px;border-radius:999px;font-size:19px;letter-spacing:2px;
  box-shadow:0 6px 0 #8e3323,0 14px 26px rgba(160,62,43,.35);
  transition:transform .12s,box-shadow .12s;
}
.btn-primary:active{transform:translateY(4px);box-shadow:0 2px 0 #8e3323}
.btn-big{font-size:24px;padding:18px 58px}
.btn-gold{
  background:linear-gradient(180deg,#f0c467,#d9a441);color:#5a3b12;font-weight:800;
  padding:14px 26px;border-radius:999px;font-size:18px;
  box-shadow:0 5px 0 #a97a25,0 12px 22px rgba(169,122,37,.4);
  transition:transform .12s,box-shadow .12s;
}
.btn-gold:active{transform:translateY(4px);box-shadow:0 1px 0 #a97a25}
.btn-gold.pulse{animation:pulse 1.2s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.07)}}
.btn-ghost{
  background:rgba(255,251,240,.92);color:var(--ink);font-weight:700;
  padding:12px 20px;border-radius:999px;font-size:15px;border:2px solid var(--line);
  box-shadow:0 4px 12px rgba(64,48,20,.12);transition:transform .12s;
}
.btn-ghost:active{transform:scale(.95)}

/* ---------- 封面 ---------- */
#slide-cover{background:#f4e2bd}
.cover-svg{position:absolute;inset:0}
.cover-ui{position:relative;z-index:2;text-align:center;margin-top:-4vh}
.cover-badge{
  display:inline-flex;align-items:center;gap:8px;background:rgba(255,251,240,.9);
  border:1.5px solid var(--line);color:var(--teal-deep);font-weight:700;font-size:15px;
  padding:8px 18px;border-radius:999px;box-shadow:var(--shadow);
}
.cover-badge .dot{width:9px;height:9px;border-radius:50%;background:var(--cinnabar)}
.cover-title{
  font-family:var(--font-disp);font-size:clamp(64px,13vw,128px);line-height:1.05;margin:14px 0 4px;
  color:#3d2c1e;letter-spacing:10px;text-shadow:0 3px 0 #fff6e2,0 10px 26px rgba(120,70,20,.25);
}
.cover-sub{font-size:clamp(17px,2.6vw,24px);color:#6d532f;letter-spacing:6px;font-weight:700;margin-bottom:14px}
.cover-tags{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
.cover-tags span{
  background:rgba(47,109,125,.12);color:var(--teal-deep);border:1.5px solid rgba(47,109,125,.35);
  padding:6px 14px;border-radius:999px;font-size:14px;font-weight:700;
}
.cover-tip{margin-top:16px;color:#7d6740;font-size:13px;letter-spacing:2px}
.seal-stamp{
  position:absolute;right:6vw;top:9vh;z-index:2;width:86px;height:86px;
  display:grid;place-items:center;background:var(--cinnabar);color:#fff;
  font-family:var(--font-disp);font-size:34px;letter-spacing:4px;text-indent:4px;
  border-radius:14px;transform:rotate(6deg);box-shadow:0 8px 20px rgba(160,62,43,.4),inset 0 0 0 4px rgba(255,255,255,.35);
}

/* ---------- 故事页 ---------- */
#slide-story{background:#f6dfb2}
.story-hint{
  position:absolute;top:calc(18px + env(safe-area-inset-top));left:50%;transform:translateX(-50%);
  background:rgba(46,58,63,.78);color:#fff;padding:9px 20px;border-radius:999px;font-size:14px;z-index:3;
  animation:bob 2s ease-in-out infinite;
}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,6px)}}
.btn-float{position:absolute;right:5vw;bottom:14vh;z-index:3;animation:pulse 1.6s ease-in-out infinite}

/* ---------- 沙盒页 ---------- */
#slide-sandbox{background:linear-gradient(180deg,#bfe3e6 0%,#9cc8cf 60%,#7fb2bd 100%);padding:0}
#gl{position:absolute;inset:0;touch-action:none}
#gl canvas{display:block;width:100%;height:100%;touch-action:none}
.hud{position:absolute;z-index:5}
.card{
  background:rgba(253,248,234,.94);border:1.5px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--shadow);backdrop-filter:blur(6px);
}
.hud-title{
  font-family:var(--font-disp);font-size:17px;color:#7a4a18;letter-spacing:2px;
  display:flex;align-items:center;gap:8px;padding:10px 14px 6px;
}
.hud-title i{font-style:normal;font-family:var(--font-body);font-size:11px;color:var(--ink-soft);font-weight:400;letter-spacing:0}
.lantern{width:12px;height:12px;border-radius:45% 45% 50% 50%;background:var(--cinnabar);box-shadow:0 0 0 2px #f0d9a8 inset,0 2px 6px rgba(200,85,61,.6)}
.hud-task{left:12px;top:calc(12px + env(safe-area-inset-top));width:230px}
.task-list{list-style:none;margin:0;padding:2px 12px 12px}
.task-list li{
  position:relative;padding:7px 6px 7px 30px;font-size:14px;color:var(--ink-soft);font-weight:600;
  border-bottom:1px dashed var(--line);transition:color .3s;
}
.task-list li:last-child{border-bottom:0}
.task-list li::before{
  content:"";position:absolute;left:6px;top:50%;transform:translateY(-50%);
  width:14px;height:14px;border-radius:50%;border:2.5px solid #cbb98c;background:#fff;
}
.task-list li.doing{color:var(--ink);font-weight:800}
.task-list li.doing::before{border-color:var(--gold);background:var(--gold-soft);animation:pulse 1.4s infinite}
.task-list li.done{color:#9b8c68;text-decoration:line-through}
.task-list li.done::before{content:"✓";border-color:var(--jade);background:var(--jade);color:#fff;font-size:10px;display:grid;place-items:center;line-height:1;text-decoration:none}
.hud-readout{right:12px;top:calc(12px + env(safe-area-inset-top));width:216px;padding-bottom:8px}
.readout-row{display:flex;justify-content:space-between;align-items:baseline;padding:5px 14px;font-size:13px;color:var(--ink-soft)}
.readout-row b{font-size:17px;color:var(--cinnabar-deep);font-family:var(--font-disp);letter-spacing:1px}
.readout-row.tip{display:block;font-size:12px;color:var(--teal-deep);padding-top:8px;line-height:1.5;border-top:1px dashed var(--line);margin-top:4px}
.hud-dock{left:12px;bottom:calc(12px + env(safe-area-inset-bottom));width:min(430px,52vw);padding-bottom:10px}
.dock-items{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;padding:2px 12px}
.dock-item{
  display:flex;flex-direction:column;align-items:center;gap:2px;padding:9px 2px 7px;
  background:#fffdf4;border:1.5px solid var(--line);border-radius:var(--r-sm);
  font-size:13px;font-weight:800;color:#6b4c22;transition:transform .12s,box-shadow .12s;
}
.dock-item:active{transform:scale(.93)}
.dock-item small{font-size:10px;font-weight:600;color:#a08c62}
.dock-item .di-emoji{font-size:24px;line-height:1.2}
.di-emoji.st1,.di-emoji.st2,.di-emoji.st3,.di-emoji.st4,.di-emoji.crate{display:inline-block;border-radius:38% 45% 42% 40%}
.di-emoji.st1{width:26px;height:24px;background:#6b6f75}
.di-emoji.st2{width:21px;height:19px;background:#878d94}
.di-emoji.st3{width:16px;height:15px;background:#a9adb2}
.di-emoji.st4{width:13px;height:12px;background:#b8bdc1}
.di-emoji.crate{width:22px;height:22px;background:linear-gradient(135deg,#c99a5e,#a9743c);border-radius:5px}
.dock-tip{padding:8px 14px 0;font-size:12px;color:var(--ink-soft)}
.dock-tip b{color:var(--cinnabar)}
.hud-actions{right:12px;bottom:calc(12px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:10px;align-items:flex-end}
.coach-bubble{
  position:absolute;left:50%;bottom:calc(150px + env(safe-area-inset-bottom));transform:translateX(-50%);
  display:flex;align-items:center;gap:10px;max-width:min(560px,86vw);z-index:6;
  background:rgba(255,251,238,.97);border:2px solid var(--gold);border-radius:18px;
  padding:10px 16px 10px 10px;box-shadow:0 12px 30px rgba(90,60,10,.25);
  animation:bubbleIn .35s cubic-bezier(.2,1.6,.4,1);
}
@keyframes bubbleIn{from{transform:translate(-50%,16px) scale(.9);opacity:0}to{transform:translate(-50%,0) scale(1);opacity:1}}
.coach-avatar{width:46px;height:46px;flex:none;border-radius:50%;background:#fdeecb;border:2px solid var(--gold)}
.coach-text{font-size:14.5px;line-height:1.55;color:#5a431f;font-weight:600}
.coach-text b{color:var(--cinnabar)}
.toast{
  position:absolute;left:50%;top:16%;transform:translateX(-50%);z-index:8;
  background:rgba(46,58,63,.88);color:#fff;font-size:17px;font-weight:700;letter-spacing:1px;
  padding:13px 30px;border-radius:999px;box-shadow:0 10px 30px rgba(0,0,0,.3);
  animation:toastIn .3s cubic-bezier(.2,1.5,.4,1);pointer-events:none;white-space:nowrap;
}
@keyframes toastIn{from{transform:translate(-50%,-14px);opacity:0}to{transform:translate(-50%,0);opacity:1}}

/* ---------- 牧场物语风对话框 ---------- */
#dialogue{
  position:fixed;left:0;right:0;bottom:0;z-index:50;display:flex;justify-content:center;
  padding:0 14px calc(20px + env(safe-area-inset-bottom));
}
#dialogue.hidden{display:none}
.dlg-box{
  position:relative;width:min(760px,94vw);display:flex;gap:14px;align-items:flex-end;
  background:linear-gradient(180deg,#fffaf0,#fbeed3);
  border:3px solid #b98a45;border-radius:22px;padding:16px 20px 18px 16px;
  box-shadow:0 4px 0 #8a6530,0 18px 40px rgba(60,40,10,.35),inset 0 0 0 2px #fffdf5;
  animation:dlgIn .32s cubic-bezier(.2,1.5,.4,1);cursor:pointer;
}
@keyframes dlgIn{from{transform:translateY(40px) scale(.94);opacity:0}to{transform:none;opacity:1}}
.dlg-box::before,.dlg-box::after{
  content:"";position:absolute;width:14px;height:14px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#f6d489,#c8553d);top:-7px;
}
.dlg-box::before{left:26px}.dlg-box::after{right:26px}
.dlg-portrait{
  flex:none;width:92px;height:92px;border-radius:50%;overflow:hidden;
  background:radial-gradient(circle at 50% 35%,#fff6dd,#f3dcae);
  border:3px solid #b98a45;box-shadow:0 4px 10px rgba(90,60,10,.3);margin-bottom:2px;
}
.dlg-portrait svg{width:100%;height:100%}
.dlg-main{flex:1;min-height:86px;display:flex;flex-direction:column}
.dlg-name{
  align-self:flex-start;background:linear-gradient(180deg,#d96248,#c1452f);color:#fff;
  font-family:var(--font-disp);font-size:15px;letter-spacing:3px;padding:4px 16px;border-radius:999px;
  margin:-30px 0 8px 6px;box-shadow:0 3px 0 #8e3323;
}
.dlg-name.narrator{background:linear-gradient(180deg,#5b6b70,#3d4a4f);box-shadow:0 3px 0 #2a3438}
.dlg-text{font-size:clamp(15px,2.4vw,19px);line-height:1.75;color:#4a3a22;font-weight:600;min-height:56px}
.dlg-text b{color:var(--cinnabar);font-weight:800}
.dlg-next{
  position:absolute;right:22px;bottom:10px;color:#b98a45;font-size:18px;
  animation:nextBob .8s ease-in-out infinite;
}
@keyframes nextBob{0%,100%{transform:translateY(0)}50%{transform:translateY(4px)}}

/* ---------- 学习单 ---------- */
#slide-sheet{justify-content:flex-start;overflow:auto;background:
  radial-gradient(circle at 20% 10%,#f8ecd0 0,transparent 50%),
  radial-gradient(circle at 85% 90%,#e9dfc0 0,transparent 45%),
  linear-gradient(160deg,#f7efdb,#eee0bd);
}
.sheet-paper{
  width:min(1060px,96vw);background:var(--paper2);border-radius:6px;
  box-shadow:0 1px 0 #fff inset,0 24px 60px rgba(80,58,18,.25);
  border:1px solid #e0d0a8;padding:clamp(16px,3vw,34px);position:relative;
}
.sheet-paper::before{
  content:"";position:absolute;inset:10px;border:2px solid rgba(185,138,69,.4);border-radius:4px;pointer-events:none;
}
.sheet-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.sheet-kicker{color:var(--cinnabar);font-weight:800;letter-spacing:6px;font-size:13px}
.sheet-head h2,.page-head h2{font-family:var(--font-disp);font-size:clamp(26px,4.6vw,38px);margin:4px 0 0;color:#3d2c1e;letter-spacing:4px}
.sheet-seal{
  width:60px;height:60px;display:grid;place-items:center;background:var(--cinnabar);color:#fff;
  font-family:var(--font-disp);font-size:22px;border-radius:10px;transform:rotate(-5deg);
  box-shadow:inset 0 0 0 3px rgba(255,255,255,.35);
}
.sheet-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.sheet-block{background:#fffdf5;border:1.5px solid var(--line);border-radius:var(--r-md);padding:16px 18px;margin-bottom:16px}
.block-title{font-family:var(--font-disp);font-size:19px;color:#7a4a18;letter-spacing:2px;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.tag-core{font-size:11px;font-family:var(--font-body);font-weight:800;letter-spacing:1px;background:var(--teal);color:#fff;padding:3px 10px;border-radius:999px}
.kv{display:flex;align-items:baseline;gap:10px;padding:7px 0;border-bottom:1px dashed var(--line);font-size:15px}
.kv label{color:var(--ink-soft);flex:none}
.kv-val{flex:1;font-weight:700;color:#4a3a22}
.kv-val b{color:var(--cinnabar);font-size:19px;font-family:var(--font-disp)}
.kv-val.formula{font-size:17px;color:var(--teal-deep);font-weight:800}
.kv.reveal .kv-val b{font-size:22px}
.kv input{border:0;border-bottom:2px solid var(--line);background:transparent;padding:4px 6px;width:100%;outline:none;font-weight:700}
.inline-answer{display:inline-block;width:10.5em;border:0;border-bottom:2px solid var(--gold);background:#fff8e9;padding:2px 5px;outline:none;font-weight:700;color:var(--cinnabar-deep)}
.inline-answer:focus{border-color:var(--cinnabar)}
.kv input:focus{border-color:var(--gold)}
.stones-used .chip,.chip{
  display:inline-block;background:#eef3ee;border:1.5px solid #b9c9ba;color:#41584a;
  border-radius:999px;padding:3px 12px;font-size:13px;font-weight:800;margin:2px 4px 2px 0;
}
.sense-line{margin-top:10px;font-size:13px;color:var(--teal-deep);background:#e8f1f0;border-radius:10px;padding:9px 12px;line-height:1.6}
.sense-line:empty{display:none}
.sentence{font-size:15.5px;line-height:2;color:#4a3a22;margin:6px 0}
.sentence mark{background:linear-gradient(transparent 62%,#f3d98c 62%);color:var(--cinnabar-deep);font-weight:800;padding:0 2px}
.key-idea{color:var(--cinnabar);font-family:var(--font-disp);font-size:19px;letter-spacing:2px}
#sh-free{
  width:100%;min-height:76px;border:1.5px solid var(--line);border-radius:12px;background:#fffdf8;
  padding:10px 12px;resize:vertical;outline:none;line-height:1.7;margin-top:6px;
}
#sh-free:focus{border-color:var(--gold)}
.word-bank{margin-top:10px;font-size:13px;color:var(--ink-soft);display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.word-bank button{
  background:#fff3d9;border:1.5px solid #dcb97e;color:#8a5a1e;border-radius:999px;
  padding:5px 13px;font-size:13px;font-weight:700;transition:transform .12s;
}
.word-bank button:active{transform:scale(.92)}
.draw-block canvas{
  width:100%;border-radius:12px;border:2px dashed #d9c69c;background:
  linear-gradient(#fffdf6,#fbf4e2);touch-action:none;display:block;
}
.draw-tools{display:flex;gap:8px;margin-top:10px;align-items:center}
.pen{width:30px;height:30px;border-radius:50%;background:var(--c);border:3px solid #fff;box-shadow:0 0 0 1.5px var(--line),0 2px 6px rgba(0,0,0,.15)}
.pen.active{box-shadow:0 0 0 3px var(--gold),0 2px 6px rgba(0,0,0,.2)}
#pen-undo,#pen-clear{font-size:13px;font-weight:700;background:#fffdf4;border:1.5px solid var(--line);border-radius:999px;padding:6px 14px;color:var(--ink-soft)}
.sheet-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.saved-tip{color:var(--jade);font-weight:700;font-size:14px}

/* ---------- 挑战页 ---------- */
#slide-challenge{justify-content:flex-start;overflow:auto}
.page-head{text-align:center;margin:2vh 0 3vh}
.page-sub{color:#7d6740;font-size:15px;margin:8px 0 0}
.challenge-grid{display:grid;grid-template-columns:repeat(3,minmax(240px,330px));gap:18px;justify-content:center;width:100%}
.challenge-card{
  background:var(--paper2);border:1.5px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--shadow);padding:20px;display:flex;flex-direction:column;gap:10px;
}
.ch-num{align-self:flex-start;background:var(--teal);color:#fff;font-size:12px;font-weight:800;letter-spacing:2px;padding:4px 12px;border-radius:999px}
.ch-title{font-family:var(--font-disp);font-size:23px;color:#3d2c1e;letter-spacing:2px}
.ch-eq{display:flex;flex-direction:column;gap:6px;background:#fbf3de;border-radius:14px;padding:14px;min-height:96px;justify-content:center}
.eq-line{font-size:19px;font-weight:800;color:#4a3a22}
.eq-q{font-size:14px;color:var(--cinnabar);font-weight:800}
.ch-options{display:flex;gap:8px}
.ch-options.col{flex-direction:column}
.ch-options button{
  flex:1;background:#fffdf4;border:2px solid var(--line);border-radius:12px;
  padding:11px 8px;font-size:15px;font-weight:800;color:#6b4c22;transition:all .15s;text-align:center;
}
.ch-options.col button{text-align:left;padding:11px 14px}
.ch-options button:active{transform:scale(.95)}
.ch-options button.right{background:#e6f2df;border-color:var(--jade);color:#3d6b3a}
.ch-options button.wrong{background:#fbe6df;border-color:var(--cinnabar);color:var(--cinnabar-deep)}
.ch-feedback{min-height:24px;font-size:13.5px;font-weight:700;color:#3d6b3a;line-height:1.5}
.challenge-card.solved{outline:3px solid var(--jade)}

/* ---------- 总结页 ---------- */
#slide-summary{justify-content:flex-start;overflow:auto}
.summary-flow{display:flex;flex-direction:column;align-items:center;gap:4px;margin:1vh 0 2.5vh}
.flow-node{
  display:flex;align-items:center;gap:12px;background:var(--paper2);border:2px solid var(--line);
  border-radius:18px;padding:12px 26px;font-size:17px;font-weight:700;color:#5a431f;box-shadow:var(--shadow);
}
.flow-node b{color:var(--cinnabar);margin-left:8px;font-family:var(--font-disp);letter-spacing:2px}
.flow-node.gold{border-color:var(--gold);background:linear-gradient(180deg,#fff6dc,#fdeec3)}
.fn-emoji{font-size:26px}
.flow-arrow{color:#a08c62;font-size:14px;font-weight:700;letter-spacing:1px}
.badges{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-bottom:3vh}
.badge{
  background:#fffdf4;border:1.5px solid var(--line);border-radius:14px;padding:12px 18px;
  font-size:13px;color:var(--ink-soft);display:flex;align-items:center;gap:10px;box-shadow:var(--shadow);
}
.badge i{font-style:normal;background:var(--jade);color:#fff;font-weight:800;font-size:12px;padding:4px 10px;border-radius:999px}
.badge:nth-child(2) i{background:var(--gold)}
.badge:nth-child(3) i{background:var(--teal)}
.badge:nth-child(4) i{background:var(--cinnabar)}
.summary-actions{display:flex;gap:14px;justify-content:center}

/* ---------- 导航 ---------- */
#ppt-nav{
  position:fixed;left:50%;bottom:calc(10px + env(safe-area-inset-bottom));transform:translateX(-50%);
  display:flex;align-items:center;gap:14px;z-index:40;
  background:rgba(253,248,234,.9);border:1.5px solid var(--line);border-radius:999px;
  padding:6px 10px;box-shadow:var(--shadow);backdrop-filter:blur(8px);
}
.nav-arrow{
  width:42px;height:42px;border-radius:50%;font-size:24px;line-height:1;color:#7a4a18;
  background:#fffdf4;border:1.5px solid var(--line);display:grid;place-items:center;
}
.nav-arrow:active{transform:scale(.9)}
.nav-arrow.disabled{opacity:.35;pointer-events:none}
.nav-dots{display:flex;gap:8px}
.nav-dots button{width:11px;height:11px;border-radius:50%;background:#d8c69c;transition:all .25s}
.nav-dots button.active{background:var(--cinnabar);transform:scale(1.35)}
.corner-tools{position:fixed;right:12px;bottom:calc(64px + env(safe-area-inset-bottom));z-index:40;display:flex;flex-direction:column;gap:8px}
.corner-tools button{
  width:42px;height:42px;border-radius:50%;background:rgba(253,248,234,.92);border:1.5px solid var(--line);
  font-size:18px;box-shadow:var(--shadow);
}
body.in-sandbox #ppt-nav{opacity:.4}
body.in-sandbox #ppt-nav:hover,body.in-sandbox #ppt-nav:focus-within{opacity:1}

/* ---------- 平板/小屏适配 ---------- */
@media (max-width:900px){
  .hud-task{width:178px}
  .task-list li{font-size:12px;padding:5px 4px 5px 24px}
  .hud-readout{width:172px}
  .readout-row b{font-size:14px}
  .hud-dock{width:min(430px,60vw)}
  .dock-item{font-size:11px}
  .dock-item .di-emoji{font-size:19px}
  .dlg-portrait{width:70px;height:70px}
  .dlg-name{margin-top:-26px}
  .challenge-grid{grid-template-columns:1fr;max-width:520px}
  .sheet-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .hud-task{display:none}
  .hud-dock{left:8px;right:8px;width:auto;bottom:calc(64px + env(safe-area-inset-bottom))}
  .dock-items{grid-template-columns:repeat(5,1fr)}
  .hud-actions{flex-direction:row;right:8px;left:8px;justify-content:flex-end;bottom:calc(8px + env(safe-area-inset-bottom))}
  .hud-actions .btn-gold{padding:12px 18px;font-size:15px}
  .hud-actions .btn-ghost{padding:10px 14px;font-size:13px}
  .corner-tools{bottom:calc(150px + env(safe-area-inset-bottom))}
  .seal-stamp{width:64px;height:64px;font-size:26px;right:4vw}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01s !important;transition-duration:.01s !important}
}