:root{--bg:#e9e3d8;--panel:#f7f2e8;--ink:#282a26;--muted:#737369;--sage:#566348;--sage-dark:#3d4935;--gold:#b99055;--orange:#c66e2d;--orange2:#e58a3f;--charcoal:#252825;--calc:#2a2b29;--calc2:#393a37;--lcd:#cfd4b5;--shadow:0 18px 45px rgba(36,31,25,.18)}
*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at 18% 10%,#f8f1e5 0,#e9e3d8 44%,#dad2c4 100%);color:var(--ink)}button,input{font:inherit}button{color:inherit}.app-shell{height:100dvh;display:grid;grid-template-rows:64px 1fr;overflow:hidden}.topbar{display:flex;align-items:center;justify-content:space-between;padding:0 clamp(12px,2.5vw,34px);border-bottom:1px solid rgba(50,48,42,.12);background:rgba(248,244,236,.86);backdrop-filter:blur(13px);z-index:5}.brand{display:flex;align-items:center;gap:11px;color:inherit;text-decoration:none}.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--sage);color:#fff;font:italic 25px Georgia,serif}.brand strong{display:block;font:600 19px Georgia,serif}.brand small{display:block;color:var(--muted);font-size:10px;margin-top:1px}.top-actions{display:flex;gap:7px}.icon-btn,.close-btn{border:0;width:40px;height:40px;border-radius:11px;background:rgba(43,44,40,.08);cursor:pointer;font-weight:800}.icon-btn:hover,.close-btn:hover{background:rgba(43,44,40,.14)}
.game-layout{height:100%;max-width:1180px;width:100%;margin:0 auto;padding:12px clamp(10px,2vw,24px);display:grid;grid-template-columns:minmax(520px,760px) minmax(230px,310px);gap:clamp(18px,3vw,42px);align-items:stretch;overflow:hidden}.play-column{min-height:0;display:grid;grid-template-rows:auto auto minmax(0,1fr) auto;gap:9px}.round-strip{display:flex;gap:7px;align-items:stretch;min-width:0}.mode-pill,.metric{border:1px solid rgba(46,46,41,.11);background:rgba(249,246,240,.88);border-radius:12px;padding:7px 11px;box-shadow:0 3px 12px rgba(40,34,28,.05)}.mode-pill{font-weight:750;cursor:pointer;white-space:nowrap}.metric{min-width:67px}.metric span{display:block;text-transform:uppercase;letter-spacing:.08em;font-size:9px;color:var(--muted)}.metric strong{display:block;margin-top:1px;font-size:14px;font-variant-numeric:tabular-nums}.metric.score{margin-left:auto;min-width:88px}.challenge-card{display:flex;align-items:center;gap:12px;background:linear-gradient(135deg,var(--sage-dark),var(--sage));color:#fff;padding:8px 14px;border-radius:14px;box-shadow:0 8px 24px rgba(48,58,42,.18)}.target-label{text-transform:uppercase;letter-spacing:.11em;font-size:9px;opacity:.72}.target-value{font:700 clamp(28px,4.2vh,43px) Georgia,serif;line-height:1}.difficulty-badge{margin-left:auto;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.18);padding:6px 9px;border-radius:999px;font-size:11px;font-weight:750}
.calculator-shell{min-height:0;width:min(100%,650px);height:100%;margin:0 auto;background:linear-gradient(145deg,#444640,#242623 72%);border-radius:26px;padding:clamp(12px,2vh,19px);box-shadow:0 22px 42px rgba(25,24,21,.27),inset 0 1px rgba(255,255,255,.17),inset 0 -3px 8px rgba(0,0,0,.25);border:1px solid rgba(0,0,0,.26);display:grid;grid-template-rows:auto minmax(0,1fr);gap:clamp(10px,1.6vh,16px);position:relative}.calculator-shell:before{content:"";position:absolute;inset:5px;border-radius:22px;border:1px solid rgba(255,255,255,.06);pointer-events:none}.calculator-top{background:#171917;padding:8px;border-radius:15px;box-shadow:inset 0 2px 7px #000}.display-bezel{height:clamp(66px,10vh,92px);background:linear-gradient(#d9ddc1,#c4caab);border-radius:9px;border:3px solid #090a09;box-shadow:inset 0 0 12px rgba(55,62,43,.18);padding:7px 13px;display:flex;flex-direction:column;justify-content:center;align-items:flex-end;overflow:hidden}.expression-line{width:100%;text-align:right;color:#59604b;font:600 clamp(10px,1.5vh,13px) ui-monospace,monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-height:15px}.display{color:#20251f;font:700 clamp(29px,5.4vh,50px) ui-monospace,monospace;letter-spacing:.02em;line-height:1;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.keypad{min-height:0;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(5,minmax(38px,1fr));gap:clamp(6px,1.2vh,10px)}.calc-key{position:relative;border:0;border-radius:11px;background:linear-gradient(#5b5b56,#40413d);color:#f7f2e9;font-size:clamp(17px,3vh,27px);font-weight:700;cursor:pointer;box-shadow:0 4px 0 #171815,0 6px 9px rgba(0,0,0,.22),inset 0 1px rgba(255,255,255,.18);text-shadow:0 1px 1px #111;transition:transform .06s,filter .12s}.calc-key:hover:not(:disabled){filter:brightness(1.1)}.calc-key:active:not(:disabled),.calc-key.pressed{transform:translateY(3px);box-shadow:0 1px 0 #171815,0 2px 4px rgba(0,0,0,.18),inset 0 1px rgba(255,255,255,.14)}.calc-key.operator{background:linear-gradient(#555650,#383936)}.calc-key.utility{font-size:clamp(13px,2.1vh,18px);background:linear-gradient(#696963,#4a4b47)}.calc-key.equals{grid-row:4/6;grid-column:4;background:linear-gradient(var(--orange2),var(--orange));box-shadow:0 4px 0 #7a3f16,0 6px 9px rgba(0,0,0,.22),inset 0 1px rgba(255,255,255,.24)}.calc-key.zero{grid-column:1/3}.calc-key.action{font-size:clamp(11px,1.7vh,14px);letter-spacing:.02em;background:linear-gradient(#4b5045,#343832)}.calc-key.broken{cursor:not-allowed;color:rgba(235,230,219,.27);background:linear-gradient(#353632,#282925);box-shadow:0 3px 0 #171815,inset 0 1px rgba(255,255,255,.05);text-shadow:none}.calc-key.broken:before,.calc-key.broken:after{content:"";position:absolute;left:14%;right:14%;top:49%;height:2px;background:rgba(183,93,60,.65);transform:rotate(-25deg);border-radius:2px}.calc-key.broken:after{transform:rotate(31deg);left:27%;right:24%;top:55%}.calc-key.hint-glow{animation:keyGlow .8s ease-in-out 3}.calc-key.illegal{animation:keyShake .25s ease 1}.bottom-actions{display:flex;justify-content:center;gap:8px}.bottom-actions button,.secondary,.start-btn{border:0;border-radius:11px;padding:9px 17px;font-weight:750;cursor:pointer}.bottom-actions button{background:rgba(44,45,40,.08)}.bottom-actions .primary,.start-btn{background:var(--sage);color:#fff}.sage-panel{min-height:0;display:grid;grid-template-rows:minmax(0,1fr) auto;align-items:end}.sage-stage{height:100%;min-height:0;display:flex;justify-content:center;align-items:flex-end;overflow:hidden}.sage-stage img{max-width:100%;max-height:100%;height:auto;object-fit:contain;object-position:center bottom;filter:drop-shadow(0 13px 14px rgba(38,32,27,.13));transition:opacity .15s ease,transform .18s ease}.sage-stage img.swap{opacity:.1;transform:scale(.985)}.sage-caption{background:rgba(249,245,237,.9);border:1px solid rgba(50,47,41,.1);border-radius:14px;padding:9px 12px;margin-top:4px;box-shadow:0 7px 20px rgba(40,34,28,.08)}.sage-caption strong{font:italic 600 20px Georgia,serif;color:var(--sage)}.sage-caption span{display:block;font-size:11px;line-height:1.35;color:var(--muted);margin-top:2px}
.modal-backdrop,.drawer-backdrop{position:fixed;inset:0;background:rgba(25,25,22,.54);backdrop-filter:blur(6px);z-index:30;display:grid;place-items:center;padding:14px}.modal-backdrop.hidden{display:none}.start-modal{position:relative;width:min(980px,96vw);max-height:94vh;display:grid;grid-template-columns:1.25fr .9fr;background:var(--panel);border-radius:24px;overflow:hidden;box-shadow:0 30px 90px rgba(0,0,0,.35)}.hero-panel{min-height:500px;background:#222}.hero-panel img{width:100%;height:100%;object-fit:cover;display:block}.start-setup{position:relative;padding:clamp(22px,3vw,36px);overflow:auto}.start-setup>.close-btn,.stats-modal>.close-btn{position:absolute;right:14px;top:14px}.eyebrow{display:block;text-transform:uppercase;letter-spacing:.14em;font-size:9px;font-weight:800;color:var(--sage);margin-bottom:5px}.start-setup h1,.settings-drawer h2,.stats-modal h2,.finish-modal h2{font:600 clamp(30px,4vw,44px) Georgia,serif;margin:0}.start-setup p{color:var(--muted);line-height:1.45;font-size:13px}.setup-group{margin:18px 0}.setup-group>label,.setting-group h3{display:block;text-transform:uppercase;letter-spacing:.1em;font-size:10px;font-weight:800;color:var(--muted);margin-bottom:8px}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;background:rgba(44,45,40,.07);border-radius:11px}.segmented button{border:0;background:transparent;padding:9px;border-radius:8px;cursor:pointer;font-weight:700}.segmented button.active{background:#fff;color:var(--sage);box-shadow:0 2px 7px rgba(0,0,0,.08)}.difficulty-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:5px}.difficulty-grid button{border:1px solid rgba(45,46,41,.12);background:transparent;border-radius:10px;padding:9px 5px;cursor:pointer}.difficulty-grid strong,.difficulty-grid span{display:block}.difficulty-grid span{font-size:9px;color:var(--muted);margin-top:2px}.difficulty-grid button.active{background:var(--sage);border-color:var(--sage);color:#fff}.difficulty-grid button.active span{color:rgba(255,255,255,.7)}.rule-note{background:rgba(86,99,72,.08);border-radius:11px;padding:11px 12px;margin:14px 0}.rule-note strong,.rule-note span{display:block}.rule-note strong{font-size:11px}.rule-note span{color:var(--muted);font-size:10px;line-height:1.4;margin-top:2px}.start-btn{width:100%;padding:13px;font-size:14px}.text-btn{border:0;background:transparent;color:var(--sage);padding:9px;cursor:pointer}.start-setup>.text-btn{width:100%}.text-btn.danger{color:#a94f49}.settings-drawer{position:fixed;right:0;top:0;bottom:0;width:min(420px,94vw);background:var(--panel);z-index:40;transform:translateX(105%);transition:.24s;box-shadow:-20px 0 60px rgba(0,0,0,.22);display:flex;flex-direction:column}.settings-drawer.open{transform:translateX(0)}.drawer-backdrop{z-index:39}.drawer-backdrop[hidden]{display:none}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:21px;border-bottom:1px solid rgba(45,46,41,.1)}.settings-drawer h2{font-size:31px}.drawer-scroll{overflow:auto;padding:4px 21px 28px}.setting-group{padding:18px 0;border-bottom:1px solid rgba(45,46,41,.09)}.toggle-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:8px 0;cursor:pointer}.toggle-row strong,.toggle-row small{display:block}.toggle-row strong{font-size:13px}.toggle-row small{font-size:10px;color:var(--muted);margin-top:2px}.toggle-row input{display:none}.toggle-row i{position:relative;width:42px;height:24px;border-radius:99px;background:rgba(42,43,39,.18);flex:none}.toggle-row i:after{content:"";position:absolute;width:18px;height:18px;border-radius:50%;background:#fff;left:3px;top:3px;transition:.18s;box-shadow:0 1px 4px rgba(0,0,0,.18)}.toggle-row input:checked+i{background:var(--sage)}.toggle-row input:checked+i:after{transform:translateX(18px)}.range-row span{display:block;font-size:12px;font-weight:700;margin-bottom:7px}.range-row input{width:100%;accent-color:var(--sage)}.full{width:100%}.stats-modal,.finish-modal{position:relative;width:min(590px,96vw);max-height:92vh;overflow:auto;background:var(--panel);border-radius:22px;padding:28px;box-shadow:0 30px 80px rgba(0,0,0,.32)}.stats-tabs{display:flex;gap:5px;overflow:auto;margin:15px 0}.stats-tabs button{border:1px solid rgba(45,46,41,.12);background:transparent;border-radius:99px;padding:7px 10px;white-space:nowrap;cursor:pointer;font-size:11px}.stats-tabs button.active{background:var(--sage);color:#fff;border-color:var(--sage)}.stats-grid,.finish-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.stats-grid>div,.finish-stats>div{background:rgba(45,46,41,.055);padding:12px;border-radius:11px;text-align:center}.stats-grid span,.finish-stats span{display:block;text-transform:uppercase;letter-spacing:.08em;font-size:8px;color:var(--muted)}.stats-grid strong,.finish-stats strong{display:block;font-size:20px;margin-top:3px}.stats-detail{margin-top:12px;font-size:12px;color:var(--muted)}.finish-modal{text-align:center;max-width:520px}.finish-modal>img{height:190px;max-width:65%;object-fit:contain;margin:-8px auto 4px}.finish-actions{display:flex;gap:8px;margin-top:17px}.finish-actions>*{flex:1}.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,16px);background:#222;color:#fff;padding:9px 13px;border-radius:9px;font-size:11px;opacity:0;pointer-events:none;transition:.18s;z-index:80}.toast.show{opacity:1;transform:translate(-50%,0)}
@keyframes keyGlow{0%,100%{box-shadow:0 4px 0 #171815,0 6px 9px rgba(0,0,0,.22)}50%{box-shadow:0 4px 0 #171815,0 0 0 4px rgba(229,138,63,.55),0 0 20px rgba(229,138,63,.7)}}@keyframes keyShake{25%{transform:translateX(-3px)}75%{transform:translateX(3px)}}
@media(max-width:850px){.game-layout{grid-template-columns:1fr;max-width:690px;gap:6px}.sage-panel{position:absolute;right:12px;top:76px;width:76px;height:76px;display:block;z-index:3;pointer-events:none}.sage-stage{width:76px;height:76px;border-radius:50%;background:rgba(247,242,232,.85);border:2px solid rgba(86,99,72,.24);box-shadow:0 6px 18px rgba(0,0,0,.13)}.sage-stage img{height:112px;max-height:none;max-width:none;transform:translateY(7px)}.sage-caption{display:none}.play-column{width:100%}.calculator-shell{width:min(100%,580px)}}
@media(max-width:600px){.app-shell{grid-template-rows:56px 1fr}.topbar{padding:0 9px}.brand-mark{width:34px;height:34px;font-size:20px}.brand strong{font-size:15px}.brand small{display:none}.icon-btn{width:35px;height:35px}.game-layout{padding:7px 5px}.round-strip{gap:4px}.mode-pill,.metric{padding:5px 7px;border-radius:9px}.mode-pill{font-size:10px}.metric{min-width:51px}.metric span{font-size:7px}.metric strong{font-size:12px}.metric.score{display:none}.challenge-card{padding:6px 10px;border-radius:11px}.target-value{font-size:28px}.difficulty-badge{font-size:9px;padding:4px 7px}.calculator-shell{padding:9px;border-radius:19px;gap:8px}.display-bezel{height:60px;padding:5px 10px}.display{font-size:28px}.expression-line{font-size:9px}.keypad{gap:5px}.calc-key{border-radius:8px;font-size:18px}.calc-key.utility,.calc-key.action{font-size:11px}.bottom-actions button{padding:7px 14px;font-size:11px}.sage-panel{right:7px;top:61px;width:58px;height:58px}.sage-stage{width:58px;height:58px}.sage-stage img{height:88px}.modal-backdrop{padding:6px;align-items:end}.start-modal{display:block;width:100%;max-height:95vh;border-radius:20px 20px 0 0;overflow:auto}.hero-panel{height:170px;min-height:0}.start-setup{padding:17px 14px 20px}.start-setup h1{font-size:30px}.difficulty-grid{grid-template-columns:repeat(3,1fr)}.settings-drawer{top:auto;left:0;right:0;bottom:0;width:100%;height:min(76vh,650px);border-radius:20px 20px 0 0;transform:translateY(105%)}.settings-drawer.open{transform:translateY(0)}.stats-grid,.finish-stats{grid-template-columns:repeat(2,1fr)}}
@media(max-height:760px) and (min-width:851px){.app-shell{grid-template-rows:56px 1fr}.game-layout{padding-top:7px;padding-bottom:7px}.calculator-shell{max-width:570px}.display-bezel{height:62px}.calc-key{font-size:19px}.sage-caption{padding:6px 10px}.sage-caption span{font-size:10px}}

/* Instructions */
.how-to-btn{border:1px solid rgba(61,73,53,.22);background:rgba(86,99,72,.08);color:var(--sage-dark);border-radius:10px;padding:8px 13px;font-weight:750;cursor:pointer;margin:2px 0 4px}.how-to-btn:hover{background:rgba(86,99,72,.14)}
.help-modal{position:relative;width:min(690px,100%);max-height:min(90dvh,820px);overflow:auto;background:var(--panel);border-radius:22px;padding:30px;box-shadow:0 28px 80px rgba(24,22,18,.32);border:1px solid rgba(50,48,42,.12)}
.help-modal>.close-btn{position:absolute;right:15px;top:15px}.help-modal h2{font:600 clamp(30px,4vw,42px) Georgia,serif;margin:0 42px 5px 0}.help-intro{color:var(--muted);margin:0 0 18px;line-height:1.5}.instruction-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.instruction-card{display:grid;grid-template-columns:34px 1fr;gap:10px;align-items:start;background:rgba(86,99,72,.065);border:1px solid rgba(61,73,53,.12);border-radius:13px;padding:12px}.step-num{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--sage);color:#fff;font-weight:800}.instruction-card strong{display:block;font-size:13px}.instruction-card p{margin:3px 0 0;color:var(--muted);font-size:12px;line-height:1.42}.help-rules{margin-top:13px;border-top:1px solid rgba(50,48,42,.11)}.help-rules>div{display:grid;grid-template-columns:150px 1fr;gap:12px;padding:10px 2px;border-bottom:1px solid rgba(50,48,42,.08)}.help-rules strong{font-size:12px}.help-rules span{font-size:12px;color:var(--muted);line-height:1.42}.help-done{width:100%;margin-top:17px}
@media(max-width:600px){.help-modal{border-radius:20px 20px 0 0;padding:22px 15px 18px;max-height:92dvh}.instruction-grid{grid-template-columns:1fr;gap:7px}.instruction-card{padding:10px}.help-rules>div{grid-template-columns:1fr;gap:2px;padding:8px 2px}.help-modal h2{font-size:29px}.help-intro{font-size:13px;margin-bottom:12px}}