:root{font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color-scheme:light;--bg:#f3f6fc;--surface:#fff;--ink:#1b2843;--sub:#64738d;--muted:#8b96aa;--line:#e5eaf3;--primary:#315bd3;--primary-dark:#2446ae;--pale:#eef3ff;--shadow:0 18px 60px rgba(37,58,104,.075);--blue:#3f79d8;--amber:#dc9640;--green:#259e74;--disp-bg:#eaf1ff;--dip-bg:#fff1dc;--hb-bg:#dff7ed;--stage:#f8faff;--btn:#f4f7fc;--danger:#c74242}
[data-theme="dark"]{color-scheme:dark;--bg:#121a2b;--surface:#1a263a;--ink:#eef3fb;--sub:#b8c5da;--muted:#92a2bb;--line:#334057;--primary:#7997ff;--primary-dark:#aec2ff;--pale:#263a5b;--shadow:0 18px 60px rgba(0,0,0,.16);--blue:#76a9fa;--amber:#e6ac66;--green:#69caa3;--disp-bg:#273b59;--dip-bg:#423628;--hb-bg:#23463f;--stage:#182237;--btn:#263550;--danger:#fa8484}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;}body{background:radial-gradient(ellipse at 25% -20%,#e8f0ff 0%,transparent 38%),var(--bg);color:var(--ink);transition:background .2s,color .2s}[data-theme="dark"] body{background:radial-gradient(ellipse at 25% -20%,#1e304e 0%,transparent 42%),var(--bg)}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #84a7ff;outline-offset:3px}.hidden{display:none!important}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.app-shell{max-width:1320px;margin:0 auto;padding:26px 34px 36px}.site-header{display:flex;align-items:center;gap:24px;min-height:64px;margin-bottom:26px}.brand{display:flex;gap:12px;align-items:center;flex-shrink:0}.brand-icon{position:relative;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#547bea,#2755c9);box-shadow:0 6px 12px #2d59c235;display:block}.brand-icon span{position:absolute;background:#c8d9ff;border-radius:50%;width:8px;height:8px}.brand-icon span:nth-child(1){left:9px;top:10px}.brand-icon span:nth-child(2){right:9px;top:10px}.brand-icon span:nth-child(3){left:18px;bottom:6px}.brand-icon i{position:absolute;left:15px;top:14px;background:white;width:14px;height:14px;border-radius:50%}.brand-icon:after{content:"";position:absolute;border:2px solid #c8d9ff;width:26px;height:26px;top:7px;left:7px;border-radius:50%;opacity:.4}.brand-name{font-size:23px;font-weight:850;letter-spacing:-.9px;line-height:1.05}.brand-name>span{color:var(--primary)}.brand-name small{display:block;letter-spacing:2.3px;font-size:9px;font-weight:800;color:var(--muted);margin-top:5px}.header-divider{height:37px;width:1px;background:var(--line)}.app-heading h1{font-size:21px;line-height:1.2;letter-spacing:-.6px;margin:0;font-weight:800}.app-heading p{margin:4px 0 0;color:var(--sub);font-size:12px}.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.icon-button{width:43px;height:43px;display:inline-grid;place-items:center;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:13px;box-shadow:0 3px 12px #1d2c4910;font-size:23px}.icon-button:hover{background:var(--pale)}.icon-button svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.main-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:22px;align-items:start}.game-panel,.side-card{background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}.game-panel{min-height:660px;overflow:hidden}.screen{min-height:658px;position:relative}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:800;color:var(--primary);text-transform:uppercase}.live-dot{display:inline-block;width:7px;height:7px;background:var(--green);border-radius:50%;margin-right:6px;vertical-align:1px}
.start-screen{display:flex;align-items:center;flex-direction:column;padding:34px 52px 36px;text-align:center}.hero-art{max-width:550px;width:100%;height:165px;margin:2px 0 0}.hero-svg{width:100%;height:100%}.start-screen h2{font-size:clamp(27px,3vw,37px);letter-spacing:-1.5px;margin:0 0 6px}.hero-description{max-width:520px;color:var(--sub);font-size:14.5px;line-height:1.6;margin:0 0 19px}.force-guide{width:100%;max-width:500px;border:1px solid var(--line);border-radius:16px;overflow:hidden;text-align:left}.force-row{display:flex;gap:12px;align-items:center;min-height:61px;padding:9px 16px}.force-row+.force-row{border-top:1px solid var(--line)}.force-row>div{flex:1}.force-row b{font-size:14px;display:block}.force-row small{font-size:12px;color:var(--sub);display:block;margin-top:3px}.force-num{display:inline-grid;place-items:center;width:35px;height:35px;font-weight:800;border-radius:9px;color:var(--ink);font-size:13px}.disp-bg{background:var(--disp-bg)}.dip-bg{background:var(--dip-bg)}.hb-bg{background:var(--hb-bg)}.force-dot{width:8px;height:8px;border-radius:50%}.force-disp{--force:var(--blue)}.force-dip{--force:var(--amber)}.force-hb{--force:var(--green)}.force-dot.force-disp{background:var(--blue)}.force-dot.force-dip{background:var(--amber)}.force-dot.force-hb{background:var(--green)}.start-actions{display:flex;align-items:center;flex-direction:column;gap:12px;margin-top:25px}.primary-button{min-height:50px;border:0;border-radius:13px;background:var(--primary);color:white;padding:12px 30px;font-weight:800;font-size:15px;box-shadow:0 4px 0 rgba(13,44,117,.18);transition:transform .12s,filter .12s}.primary-button:hover{filter:brightness(1.08)}.primary-button:active{transform:translateY(2px);box-shadow:none}.primary-button>span{margin-left:13px;font-size:19px}.keyboard-hint{font-size:12px;color:var(--muted)}kbd{font:700 11px/1.2 inherit;font-family:inherit;background:var(--btn);border:1px solid var(--line);border-radius:5px;padding:3px 7px;color:var(--sub)}
.play-screen{padding:26px 34px 24px;display:flex;flex-direction:column}.play-top{display:flex;justify-content:space-between;align-items:start}.score-metric{display:flex;flex-direction:column;gap:2px;min-width:82px}.score-metric>span{font-size:11px;font-weight:800;letter-spacing:1.5px;color:var(--muted)}.score-metric strong{font-size:30px;letter-spacing:-1px;font-variant-numeric:tabular-nums;line-height:1.2}.score-metric .unit{font-size:16px;color:var(--sub);padding-left:2px}.align-right{text-align:right}.mode-chip{align-self:center;background:var(--pale);border:1px solid var(--line);color:var(--primary);font-size:11px;font-weight:800;letter-spacing:1px;border-radius:99px;padding:8px 14px}.timer-track{margin-top:16px;background:var(--stage);height:10px;border-radius:99px;overflow:hidden}.timer-fill{height:100%;width:100%;border-radius:99px;background:#35b584;transition:width .035s linear,background .15s}.prompt-top{display:flex;justify-content:space-between;align-items:center;margin-top:21px}.prompt-helper{font-size:11px;color:var(--muted);letter-spacing:1.1px;font-weight:700}.molecule-stage{min-height:324px;flex:1;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:5px;padding:18px 12px;margin:15px 0 8px;border:1px solid var(--line);background:var(--stage);border-radius:16px}.molecule-art{height:255px;width:100%;display:flex;align-items:center;justify-content:center;overflow:hidden}.molecule-art svg{display:block;max-width:100%;max-height:100%;width:100%;height:100%;color:var(--ink)}.molecule-name{color:var(--sub);font-size:15px;min-height:24px;font-weight:700;letter-spacing:.15px}.answer-heading{font-size:13px;font-weight:750;color:var(--sub);margin:5px 0 11px}.answer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:11px}.answer-button{--fill:var(--blue);height:100px;text-align:left;border:1.5px solid var(--line);border-radius:14px;background:var(--surface);position:relative;padding:14px 15px;transition:border-color .15s,transform .1s,background .15s;display:flex;flex-direction:column;justify-content:space-between;color:var(--ink)}.answer-button:hover{border-color:var(--force);background:var(--stage);transform:translateY(-2px)}.answer-button:active{transform:translateY(0)}.answer-button.force-disp{--force:var(--blue)}.answer-button.force-dip{--force:var(--amber)}.answer-button.force-hb{--force:var(--green)}.answer-button:before{content:"";height:4px;background:var(--force);position:absolute;left:16px;right:16px;top:0;border-radius:0 0 4px 4px}.answer-key{font-size:11px;font-weight:850;color:var(--force);letter-spacing:.4px}.answer-label{font-size:15.5px;font-weight:800;letter-spacing:-.35px}.answer-secondary{font-size:12.5px;font-weight:500;color:var(--sub);display:block;margin-top:4px;letter-spacing:0}.play-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:20px;color:var(--muted);font-size:12px}.text-button{background:none;border:none;padding:6px;color:var(--sub);font-weight:750;font-size:12px}.text-button:hover{text-decoration:underline;color:var(--primary)}
.feedback{min-height:161px;padding:16px 18px;background:var(--pale);border:1px solid var(--line);border-radius:14px;margin-top:9px}.feedback-flag{font-size:11px;letter-spacing:1.4px;color:var(--primary);font-weight:800;margin-bottom:4px}.feedback strong{display:block;font-size:16px;margin-bottom:4px}.feedback-explainer{color:var(--sub);font-size:13px;line-height:1.5;margin-bottom:14px}.primary-button.compact{min-height:41px;font-size:13px;padding:9px 18px;box-shadow:none}.primary-button kbd{color:white;background:#ffffff22;border-color:#ffffff66;margin-left:5px}.feedback.is-wrong{background:color-mix(in srgb,var(--danger) 6%,var(--surface))}
.over-screen{text-align:center;padding:38px 42px 30px;display:flex;flex-direction:column;align-items:center}.result-burst{font-size:34px;color:var(--primary);margin:16px 0 -6px}.over-screen h2{font-size:31px;letter-spacing:-1px;margin:5px 0 6px}.result-score{display:flex;align-items:baseline;gap:10px;margin-bottom:16px}.result-score strong{font-size:57px;letter-spacing:-2px}.result-score span{font-size:15px;color:var(--sub)}.missed-card{width:100%;max-width:510px;text-align:center;border:1px solid var(--line);border-radius:16px;padding:13px 20px 15px;background:var(--stage);margin-bottom:16px}.missed-label{font-size:10px;letter-spacing:1.8px;color:var(--muted);font-weight:850}.missed-molecule{width:100%;height:112px;display:flex;align-items:center;justify-content:center;overflow:hidden}.missed-molecule svg{height:100%;width:100%;color:var(--ink)}.missed-card b{display:block;font-size:14px}.missed-card p{font-size:14px;color:var(--primary);font-weight:800;margin:5px 0}.missed-card small{display:block;max-width:470px;color:var(--sub);font-size:12px;line-height:1.45}.save-score{width:100%;max-width:510px}.save-heading{font-weight:800;font-size:13px;margin-bottom:8px}.save-score form{display:flex;gap:8px}.save-score input{height:42px;border:1px solid var(--line);background:var(--surface);color:var(--ink);flex:1;min-width:0;border-radius:10px;padding:0 12px}.secondary-button{background:var(--pale);border:1px solid var(--line);color:var(--primary);padding:0 20px;border-radius:10px;font-weight:800}.secondary-button:hover{filter:brightness(.95)}.save-note{display:block;font-size:11px;color:var(--muted);margin-top:6px}.end-buttons{display:flex;align-items:center;gap:10px;margin-top:20px}.subtle-button{border:1px solid var(--line);color:var(--sub);background:var(--surface);height:50px;padding:0 24px;border-radius:12px;font-weight:700}.subtle-button:hover{background:var(--pale)}
.sidebar{display:flex;flex-direction:column;gap:16px}.side-card{border-radius:19px;padding:21px 19px}.side-title{display:flex;gap:9px;align-items:center}.side-icon{display:grid;place-items:center;width:30px;height:30px;background:var(--pale);border-radius:9px;color:var(--primary);font-size:19px}.side-title h2{font-size:14px;letter-spacing:-.2px;margin:0}.side-sub{color:var(--sub);font-size:12px;margin:9px 0 15px}.board-list{list-style:none;margin:0;padding:0;min-height:120px}.board-list li{display:flex;align-items:center;gap:10px;border-bottom:1px solid var(--line);padding:10px 3px;font-size:13px}.board-list li:last-child{border-bottom:0}.board-rank{width:24px;color:var(--muted);font-size:13px;font-weight:800}.board-name{min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}.board-score{color:var(--primary);font-weight:850;font-variant-numeric:tabular-nums}.board-list li.board-empty{border:0;justify-content:center;color:var(--muted);font-size:12px;padding:30px 4px}.board-list li.highlight{background:var(--pale);padding-left:6px;padding-right:6px;border-radius:8px}.privacy-line{border-top:1px solid var(--line);padding-top:13px;color:var(--muted);display:flex;align-items:center;gap:7px;font-size:11px}.privacy-line svg{width:16px;height:16px;fill:none;stroke:var(--green);stroke-width:1.8}.quick-tip p{color:var(--sub);font-size:12.5px;line-height:1.7;margin:13px 0 0}.quick-tip b{color:var(--ink)}.side-footer{font-size:11px;color:var(--muted);text-align:center;line-height:1.5;padding:0 9px}
#settingsDialog{border:1px solid var(--line);border-radius:20px;padding:0;width:min(94vw,475px);max-height:min(90vh,670px);background:var(--surface);color:var(--ink);box-shadow:0 25px 80px rgba(10,20,50,.3)}#settingsDialog::backdrop{background:rgba(14,25,45,.57);backdrop-filter:blur(3px)}.settings-modal{padding:27px}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}.modal-header h2{font-size:25px;margin:5px 0 0;letter-spacing:-.8px}.field-label{display:block;font-weight:800;font-size:13px;margin-bottom:9px}#modeSelect{width:100%;height:48px;background:var(--stage);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:0 12px;font-size:13px}.setting-row{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:17px 0;border-bottom:1px solid var(--line)}.setting-row strong{display:block;font-size:13px}.setting-row small{display:block;color:var(--sub);font-size:12px;margin-top:4px}.switch{position:relative;display:block;flex-shrink:0;width:42px;height:25px}.switch input{position:absolute;opacity:0}.switch span{display:block;width:100%;height:100%;background:var(--line);border-radius:99px;transition:.2s}.switch span:before{content:"";position:absolute;top:4px;left:4px;width:17px;height:17px;background:white;border-radius:50%;box-shadow:0 1px 3px #0002;transition:.2s}.switch input:checked+span{background:var(--primary)}.switch input:checked+span:before{transform:translateX(17px)}.switch input:focus-visible+span{outline:3px solid #84a7ff;outline-offset:3px}.modal-note{font-size:12px;line-height:1.55;color:var(--sub);margin:17px 0}.modal-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}.danger{color:var(--danger)}
@media(max-width:1050px){.main-grid{grid-template-columns:minmax(0,1fr) 240px;gap:14px}.app-shell{padding:18px}.game-panel{min-height:620px}.screen{min-height:618px}.sidebar .side-card{padding:16px}.start-screen{padding:26px 25px}.play-screen{padding:22px 23px}.molecule-art{height:225px}.molecule-stage{min-height:280px}}
@media(max-width:760px){.site-header{margin-bottom:18px;gap:12px}.app-shell{padding:13px}.header-divider,.app-heading p{display:none}.app-heading h1{font-size:15px}.brand-name{font-size:18px}.brand-icon{width:35px;height:35px}.brand-icon i{left:12px;top:12px;width:11px;height:11px}.brand-icon span:nth-child(1){left:6px;top:7px}.brand-icon span:nth-child(2){right:6px;top:7px}.brand-icon span:nth-child(3){left:14px;bottom:3px}.brand-icon:after{left:4px;top:4px}.header-actions{gap:6px}.icon-button{width:38px;height:38px}.main-grid{grid-template-columns:1fr}.sidebar{display:grid;grid-template-columns:1fr 1fr;gap:12px}.side-footer{grid-column:1/-1}.game-panel,.screen{min-height:0}.game-panel{border-radius:17px}.start-screen{padding:26px 22px 30px}.hero-art{height:140px}.sidebar .side-card{border-radius:16px}.play-screen{min-height:610px}.over-screen{min-height:630px}}
@media(max-width:540px){.app-shell{padding:10px}.site-header{gap:8px;margin:3px 3px 12px}.brand-name{display:none}.app-heading{min-width:0}.app-heading h1{font-size:17px}.site-header .brand{gap:0}.start-screen{padding:24px 17px 25px}.start-screen h2{font-size:28px}.hero-art{height:122px}.hero-description{font-size:13px}.force-row{min-height:62px}.force-row b{font-size:13px}.force-row small{font-size:11px}.start-actions{margin-top:21px}.play-screen{padding:20px 14px 18px;min-height:605px}.prompt-helper{font-size:9px;letter-spacing:.45px}.molecule-stage{margin:12px 0 8px;min-height:265px;padding:13px 7px}.molecule-art{height:220px}.answer-grid{gap:7px}.answer-button{height:93px;padding:13px 9px}.answer-button:before{left:9px;right:9px}.answer-label{font-size:12.3px;letter-spacing:-.25px}.answer-secondary{font-size:11px}.answer-key{font-size:10px}.play-foot{font-size:10px}.over-screen{padding:28px 15px}.result-score strong{font-size:52px}.end-buttons{flex-wrap:wrap;justify-content:center}.sidebar{grid-template-columns:1fr}.side-footer{grid-column:1}.sidebar .quick-tip{display:none}.side-card{padding:15px!important}.board-list{min-height:55px}.board-list li.board-empty{padding:14px 4px}.side-sub{margin:5px 0 8px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important}}