@import url('https://fonts.googleapis.com/css2?family=Mitr:wght@400;600;700&family=Noto+Sans+Thai:wght@500;700;800&display=swap');
:root{--ink:#173d55;--orange:#ff8a3d;--mint:#4bd6b0;--cream:#fffaf0;--shadow:#173d5540}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:'Noto Sans Thai',sans-serif;color:var(--ink)}button,input{font:inherit}button{cursor:pointer}body{overflow:hidden;background:#facb8d url('assets/market-background.png') center/cover fixed no-repeat}.app{width:100vw;height:100dvh;padding:12px;display:grid;grid-template-rows:64px 1fr;gap:10px;background:linear-gradient(#fff1,#e8782830)}
header{display:flex;align-items:center;justify-content:space-between;padding:6px 14px 6px 18px;border:3px solid #fff;border-radius:23px;background:#fffaf0ef;box-shadow:0 7px 0 #d86b31,0 12px 22px var(--shadow)}.brand{display:flex;align-items:center;gap:11px}.brand>span{width:46px;height:46px;display:grid;place-items:center;border-radius:14px;background:#ffd84a;border:3px solid #fff;box-shadow:0 4px 0 #e09b21;font-size:24px}.brand>div,.panel-title>div,.shelf-title>div{display:flex;flex-direction:column;gap:3px}.brand small,.panel-title small,.shelf-title small{color:#e66731;font-weight:800;line-height:1}.brand h1,.panel-title h2,.shelf-title h2{font:700 27px/1.15 Mitr;margin:0}.header-actions{display:flex;gap:8px}.header-actions button{width:45px;height:45px;border:2px solid #d9e8eb;border-radius:14px;background:#fff;box-shadow:0 4px 0 #b8ccd2;font-size:21px}
.workspace{min-height:0;display:grid;grid-template-columns:minmax(650px,1.55fr) minmax(400px,.85fr);gap:12px}.stage,.panel{min-height:0;border:4px solid #fff;border-radius:30px;box-shadow:0 10px 0 #c65d2c,0 18px 30px var(--shadow);overflow:hidden}.stage{position:relative;padding:70px 25px 15px;background:radial-gradient(circle at 50% 36%,#fff8,transparent 55%)}.lesson{position:absolute;top:12px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:10px;padding:8px 18px;background:#fff8e7;border:3px solid #ffc941;border-radius:999px;box-shadow:0 5px 0 #d7792e;white-space:nowrap}.lesson strong:first-child{color:#da4e3f}.lesson strong:last-of-type{color:#399ac5}.lesson i{height:22px;border-left:2px solid #dfad7b}
.balance{position:relative;height:calc(100% - 74px);min-height:440px}.beam-wrap{position:absolute;left:50%;top:25%;width:76%;height:280px;transform:translateX(-50%) rotate(0deg);transform-origin:50% 38px;transition:transform .65s cubic-bezier(.2,.8,.25,1)}.beam{position:absolute;top:18px;left:0;width:100%;height:40px;border:5px solid #713e27;border-radius:22px;background:linear-gradient(#ffc961,#e27a32);box-shadow:0 7px 0 #743e28,0 12px 20px #173d5540}.beam:after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;background:radial-gradient(circle,#fff1a8 0 25%,#e05537 27% 62%,#7d3327 64%);border:4px solid #fff3b6}.left-hook,.right-hook{position:absolute;top:28px;width:12px;height:16px;border-radius:8px;background:#6c3c2a}.left-hook{left:8%}.right-hook{right:8%}.pan-unit{position:absolute;top:48px;width:40%;height:230px;transform-origin:50% 0;transition:transform .65s cubic-bezier(.2,.8,.25,1)}.pan-unit.left{left:-10%}.pan-unit.right{right:-10%}.chains{position:absolute;left:15%;right:15%;top:0;height:130px;background:linear-gradient(72deg,transparent 49%,#6c4b37 49% 51%,transparent 51%),linear-gradient(-72deg,transparent 49%,#6c4b37 49% 51%,transparent 51%)}.tray{position:absolute;left:0;right:0;top:112px;height:98px;display:flex;align-items:center;justify-content:center;border:7px solid #effeff;border-top-width:10px;border-radius:16% 16% 48% 48%/30% 30% 70% 70%;background:linear-gradient(#eafcff,#75b8c8);box-shadow:inset 0 -14px 16px #39758455,0 8px 0 #315b67,0 13px 20px #173d5540}.tray.dragover{filter:drop-shadow(0 0 14px #fff);transform:translateY(-3px)}.tray>span{font-weight:800;color:#3b7280}.tray.has-items>span{display:none}.tray-items{position:relative;z-index:5;display:flex;align-items:flex-end;justify-content:center;gap:3px;width:96%;height:105%;overflow:visible}.tray-item{position:relative;z-index:6;width:clamp(65px,5.6vw,95px);flex:0 1 clamp(65px,5.6vw,95px);transform:translateY(-8px);animation:drop .35s cubic-bezier(.2,1.4,.5,1)}.tray-item svg{display:block;width:100%}.tray-item button{position:absolute;right:0;top:-3px;z-index:7;width:25px;height:25px;border:0;border-radius:50%;padding:0;background:#eb4e4e;color:#fff;font-weight:800}
.pivot{position:absolute;left:50%;top:calc(25% + 32px);transform:translateX(-50%);width:210px;height:69%;display:flex;flex-direction:column;align-items:center}.cap{position:relative;z-index:2;width:86px;height:70px;clip-path:polygon(50% 0,100% 100%,0 100%);background:linear-gradient(90deg,#cc682f,#ffc65c,#bd562d);filter:drop-shadow(0 5px 0 #6e3925)}.pillar{flex:1;width:75px;background:linear-gradient(90deg,#a84c2c,#f49b45 35% 65%,#9a4429);border-inline:5px solid #733b27;position:relative}.level-mark{position:absolute;top:38%;left:50%;transform:translateX(-50%);width:98px;padding:5px;text-align:center;border:4px solid #fff0b3;border-radius:14px;background:#2b7180;color:#fff;box-shadow:0 4px 0 #173d55;font-weight:800}.base{width:220px;padding:10px;border:4px solid #ffe0a1;border-radius:14px 14px 26px 26px;background:linear-gradient(#ffb353,#d76b30);box-shadow:0 7px 0 #773c27;color:#fff;text-align:center;font:700 11px Mitr;letter-spacing:1px}
.status-row{position:absolute;left:5%;right:5%;bottom:15px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:15px}.weight-box{padding:7px 14px;border:3px solid #fff;border-radius:15px;background:#fff8e9e8;text-align:center;box-shadow:0 4px 0 #dda05e}.weight-box small{display:block;color:#7b6a59;font-weight:700}.weight-box strong{font-size:17px;color:#e55e33}.compare-badge{padding:10px 18px;border-radius:999px;background:#173d55;color:#fff;border:3px solid #fff;box-shadow:0 4px 0 #0b2736;font-weight:800;white-space:nowrap}
.panel{padding:16px;background:#fffaf0f3;overflow:auto}.panel-title,.shelf-title{display:flex;align-items:center;justify-content:space-between;gap:10px}.panel-title #modeBadge{padding:6px 10px;border-radius:999px;background:#e4fbf4;color:#16856b;font-size:12px;font-weight:800}.main-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0}.main-actions button,.clear{min-height:46px;border:0;border-radius:13px;background:#dcebed;color:#234d5f;font-weight:800;box-shadow:0 4px 0 #9ebec4}.main-actions .primary{background:var(--mint);color:#0b4f42;box-shadow:0 4px 0 #159277}.teacher-tools[hidden]{display:none}.teacher-tools{padding-bottom:12px;border-bottom:2px dashed #eeb27e}.modes{display:grid;grid-template-columns:1fr 1fr;padding:5px;background:#dcebed;border-radius:15px}.mode{border:0;background:transparent;padding:9px;border-radius:11px;color:#55707b;font-weight:800}.mode.active{background:#fff;color:#173d55;box-shadow:0 3px 8px #173d5530}.tilt-control{margin:10px 0;padding:10px 12px;background:#fff;border:2px solid #d7e9ec;border-radius:16px}.tilt-control label{display:block;text-align:center;font-weight:800}.tilt-control input{width:100%;accent-color:#ff7645}.tilt-control div{display:flex;justify-content:space-between;font-size:11px;font-weight:700}.clear{width:100%}.side-picker{display:grid;grid-template-columns:auto 1fr 1fr;align-items:center;gap:7px;margin:13px 0}.side-picker strong{font-size:13px}.pick{padding:8px;border:2px solid #bed9df;border-radius:11px;background:#fff;color:#426674;font-weight:800}.pick.active{background:#ffd551;border-color:#f0a52f;color:#673d20}.shelf-title{padding-top:8px}.shelf-title span{font-size:11px;color:#708086}.shelf{display:grid;grid-template-columns:repeat(4,minmax(74px,1fr));gap:8px;margin-top:9px}.item-card{min-height:108px;padding:5px 3px;border:2px solid #fff;border-radius:16px;background:linear-gradient(#fff,#fff4d7);box-shadow:0 5px 0 #dfa15d;text-align:center;color:#264e60;touch-action:none}.item-card:hover{transform:translateY(-2px)}.item-art{height:55px;display:grid;place-items:center}.item-art svg{width:58px;height:58px}.item-card strong{display:block;font-size:12px;line-height:1.1}.item-card small{font-size:11px;font-weight:800;color:#e55e33}.toast{position:fixed;z-index:120;left:50%;bottom:20px;transform:translate(-50%,20px);padding:10px 18px;border:3px solid #fff;border-radius:14px;background:#173d55;color:#fff;font-weight:800;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}
.intro{position:fixed;z-index:100;inset:0;display:grid;place-items:center;padding:20px;background:linear-gradient(#153b558f,#bc5d2d85),url('assets/market-background.png') center/cover}.intro.hidden{display:none}.intro-card{width:min(720px,92vw);padding:38px;text-align:center;border:5px solid #fff;border-radius:38px;background:#fffaf0f3;box-shadow:0 13px 0 #c85e2d,0 28px 55px #173d5570}.intro-icon{margin:auto;width:90px;height:90px;display:grid;place-items:center;border:5px solid #fff;border-radius:27px;background:linear-gradient(135deg,#ffd84a,#ff8a3d);box-shadow:0 7px 0 #c75c2d;font-size:50px}.intro .eyebrow{margin:20px 0 0;color:#e25e32;font-weight:800}.intro h1{margin:0;font:700 clamp(45px,7vw,76px)/1.1 Mitr}.intro h2{margin:0;color:#e25e32;font:600 clamp(24px,3vw,36px) Mitr}.intro p{font-size:20px}.intro-tips{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:18px}.intro-tips span{padding:8px 13px;border-radius:999px;background:#e2f8f2;color:#18745f;font-weight:800}.intro #startBtn{min-width:250px;padding:14px;border:3px solid #fff;border-radius:18px;background:#ff9145;color:#fff;box-shadow:0 7px 0 #bd4d29;font:700 24px Mitr}@keyframes drop{from{transform:translateY(-45px) scale(.6);opacity:0}}
@media(max-height:750px) and (min-aspect-ratio:4/3){.app{padding:7px;grid-template-rows:55px 1fr}.stage{padding-top:58px}.lesson{top:8px}.balance{min-height:350px}.beam-wrap{top:21%;height:235px}.pan-unit{height:200px}.chains{height:100px}.tray{top:88px;height:82px}.pivot{top:calc(21% + 32px)}.status-row{bottom:8px}.panel{padding:10px 13px}.main-actions,.side-picker{margin:8px 0}.item-card{min-height:87px}.item-art{height:42px}.item-art svg{width:45px;height:45px}.intro-card{padding:22px}.intro-icon{width:68px;height:68px;font-size:36px}.intro p,.intro-tips{margin:8px}}
@media(max-aspect-ratio:4/3){body{overflow:auto}.app{height:auto;min-height:100dvh}.workspace{grid-template-columns:1fr}.stage{min-height:720px}.panel{overflow:visible}}

/* Revision: weight-proportional objects and stronger primary action */
.tray-item{width:var(--item-size);flex:0 1 var(--item-size);max-width:34%}
.main-actions .primary{background:linear-gradient(#ff58b6,#ef3195);color:#fff;border:2px solid #fff;box-shadow:0 4px 0 #a91668,0 7px 13px #ef319540}