:root{color-scheme:dark;--ink: #f3f7ff;--muted: #91a1bc;--muted-strong: #b7c2d6;--night: #071329;--night-deep: #040c1d;--panel: rgba(15, 32, 61, .88);--panel-soft: rgba(18, 40, 74, .6);--line: rgba(123, 157, 205, .2);--line-strong: rgba(123, 157, 205, .34);--teal: #5de0d0;--teal-dark: #24aaad;--amber: #ffd166;--amber-soft: #ffdf8b;--danger: #ff8a8a;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none}*{box-sizing:border-box}html,body{min-width:320px;min-height:100%;margin:0;background:var(--night-deep)}body{color:var(--ink);background-image:radial-gradient(circle at 50% -10%,#13315d 0,transparent 42%),linear-gradient(145deg,#07152f,#040b19 72%)}button{font:inherit;color:inherit}button:focus-visible{outline:3px solid var(--amber);outline-offset:3px}.page-shell{position:relative;min-height:100vh;overflow:hidden}.icon{display:inline-flex;width:1.1rem;height:1.1rem;flex:0 0 auto}.icon svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8}.eyebrow{margin:0;color:var(--teal);font-size:.76rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.menu-screen{display:flex;flex-direction:column;padding:28px clamp(20px,5vw,72px)}.menu-topbar,.game-header{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between}.brand-mark{width:34px;height:34px;position:relative;border:1px solid rgba(93,224,208,.45);border-radius:10px;background:#5de0d014;transform:rotate(45deg)}.brand-mark:before,.brand-mark:after,.brand-mark span{content:"";position:absolute;left:50%;top:50%;background:var(--teal);transform:translate(-50%,-50%)}.brand-mark:before{width:4px;height:22px;border-radius:3px}.brand-mark:after{width:22px;height:4px;border-radius:3px}.brand-mark span{width:8px;height:8px;border-radius:50%;background:var(--amber)}.icon-button{display:inline-grid;place-items:center;width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:12px;background:#08152d94;cursor:pointer;transition:border-color .2s,color .2s,transform .2s}.icon-button:hover{border-color:var(--teal);color:var(--teal);transform:translateY(-1px)}.menu-content{position:relative;z-index:1;width:min(860px,100%);margin:auto;padding:7vh 0 4vh}.title-lockup{max-width:600px}h1,h2,p{margin-top:0}h1{margin-bottom:24px;font-size:clamp(3.2rem,8vw,7rem);letter-spacing:-.07em;line-height:.94}h1 span{color:var(--amber)}.lead{max-width:470px;margin-bottom:40px;color:var(--muted-strong);font-size:clamp(1rem,1.8vw,1.22rem);line-height:1.65}.menu-actions{display:flex;align-items:center;gap:18px;margin-bottom:74px}.primary-button,.secondary-button,.level-chip,.text-button,.back-button{cursor:pointer}.primary-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 21px;border:0;border-radius:14px;background:var(--amber);color:#151f35;font-weight:800;box-shadow:0 10px 30px #ffd1662b;transition:transform .2s,box-shadow .2s,background .2s}.primary-button:hover{background:var(--amber-soft);transform:translateY(-2px);box-shadow:0 14px 36px #ffd1663d}.progress-note{margin:0;color:var(--muted);font-size:.88rem}.level-select{max-width:600px}.section-heading{display:flex;justify-content:space-between;margin-bottom:14px;color:var(--muted-strong);font-size:.86rem;font-weight:700}.section-count{color:var(--muted);font-weight:500}.level-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:8px}.level-chip{position:relative;min-width:44px;min-height:44px;border:1px solid var(--line);border-radius:12px;background:#0b1c37ad;color:var(--muted-strong);font-size:.88rem;transition:border-color .2s,color .2s,background .2s,transform .2s}.level-chip:hover:not(:disabled){border-color:var(--teal);color:var(--ink);transform:translateY(-2px)}.level-chip.complete{border-color:#5de0d099;background:#2284843d;color:var(--teal)}.level-chip i{position:absolute;right:4px;top:2px;font-size:.63rem;font-style:normal}.level-chip:disabled{cursor:not-allowed;opacity:.34}.menu-footer{display:flex;justify-content:space-between;gap:20px;margin-top:32px;color:#7486a4;font-size:.77rem}.text-button{padding:0;border:0;background:none;color:#8291a9;text-decoration:underline;text-underline-offset:4px}.text-button:hover{color:var(--danger)}.ambient{position:absolute;z-index:0;border:1px solid rgba(93,224,208,.08);border-radius:50%;pointer-events:none}.ambient:after{content:"";position:absolute;inset:25%;border-radius:50%;background:#5de0d00d;filter:blur(24px)}.ambient-one{right:-12vw;top:26%;width:44vw;aspect-ratio:1}.ambient-two{left:-20vw;bottom:-35vw;width:55vw;aspect-ratio:1;border-color:#ffd16612}.game-screen{padding:22px clamp(18px,4vw,60px) 30px}.game-header{width:min(1280px,100%);margin:0 auto 22px}.back-button{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:0;border:0;background:none;color:var(--muted);font-size:.86rem}.back-button:hover{color:var(--ink)}.game-title{display:flex;flex-direction:column;align-items:center;gap:5px;text-align:center}.game-title strong{font-size:1rem}.game-layout{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1fr) 220px;align-items:center;gap:clamp(22px,6vw,100px);width:min(1100px,100%);margin:0 auto}.game-main{min-width:0}.stats-row{display:flex;align-items:center;gap:28px;min-height:58px;margin-bottom:14px}.stat{display:flex;align-items:baseline;gap:8px}.stat-label{color:var(--muted);font-size:.78rem}.stat strong{color:var(--ink);font-size:1.18rem}.stat small{color:var(--muted);font-size:.78rem;font-weight:500}.status-pill{display:inline-flex;align-items:center;gap:8px;min-height:30px;margin-left:auto;padding:0 11px;border:1px solid var(--line);border-radius:99px;color:var(--muted-strong);font-size:.76rem}.status-pill.success{border-color:#5de0d080;color:var(--teal)}.status-dot{width:7px;height:7px;border-radius:50%;background:#647896;box-shadow:0 0 0 4px #64789614}.success .status-dot{background:var(--teal);box-shadow:0 0 12px var(--teal)}.board-wrap{width:min(100%,660px,max(320px,calc(100vh - 330px)));margin:auto;transition:width .2s ease}.board-wrap.is-won{width:min(100%,660px,max(320px,calc(100vh - 410px)))}.board{display:grid;width:100%;aspect-ratio:1;grid-template-columns:repeat(3,1fr);padding:clamp(8px,1.4vw,16px);gap:clamp(5px,.9vw,10px);border:1px solid rgba(107,152,203,.24);border-radius:24px;background:linear-gradient(145deg,#122b52f5,#07162ffa);box-shadow:0 24px 70px #00000042,inset 0 1px #ffffff0a}.board-4{grid-template-columns:repeat(4,1fr)}.board-5{grid-template-columns:repeat(5,1fr)}.board-6{grid-template-columns:repeat(6,1fr)}.cell{position:relative;min-width:44px;min-height:44px;padding:0;overflow:visible;border:1px solid rgba(124,162,207,.13);border-radius:clamp(7px,1.1vw,13px);background:#11284ca3;cursor:default;transition:background .18s,border-color .18s,box-shadow .18s}.cell.straight,.cell.corner,.cell.tee{cursor:pointer}.cell.straight:hover,.cell.corner:hover,.cell.tee:hover{border-color:#5de0d099;background:#1a3c5fd9}.cell svg{display:block;width:100%;height:100%;overflow:visible}.cell.empty{border-color:transparent;background:#08162d47}.wire-line{stroke:#7590b0;stroke-width:14;stroke-linecap:round;fill:none;transition:stroke .16s,filter .16s}.wire-junction{fill:#7590b0;transition:fill .16s,filter .16s}.cell.powered .wire-line{stroke:var(--teal);filter:drop-shadow(0 0 5px rgba(93,224,208,.75))}.cell.powered .wire-junction{fill:var(--teal);filter:drop-shadow(0 0 5px rgba(93,224,208,.75))}.source-halo{fill:#5de0d01f;stroke:#5de0d073;stroke-width:1.5}.source-core{fill:#164b69;stroke:var(--teal);stroke-width:2}.source-bolt{fill:var(--amber);filter:drop-shadow(0 0 5px rgba(255,209,102,.8))}.house-backplate{fill:#10294d;stroke:#10294d;stroke-width:4;stroke-linejoin:round}.house-roof,.house-body{fill:none;stroke:#a0afc5;stroke-width:5;stroke-linejoin:round}.house-body{fill:#1d355d;stroke-width:3}.house-door{fill:#71829c}.house-window{fill:#71829c;transition:fill .18s,filter .18s}.cell.powered .house-roof,.cell.powered .house-body{stroke:var(--amber);filter:drop-shadow(0 0 4px rgba(255,209,102,.65))}.cell.powered .house-body{fill:#435274}.cell.powered .house-backplate{fill:#263b61;stroke:#263b61}.cell.powered .house-window{fill:var(--amber);filter:drop-shadow(0 0 7px rgba(255,209,102,.9))}.cell.powered .house-door{fill:var(--amber-soft)}.hint-ring{position:absolute;inset:7px;border:2px solid 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0;color:var(--amber-soft);font-size:.75rem;line-height:1.5;text-align:center;opacity:0;transition:opacity .2s}.hint-message.visible{opacity:1}.side-note{align-self:end;max-width:210px;margin-bottom:58px;padding:17px;border-left:1px solid rgba(93,224,208,.42);background:linear-gradient(90deg,rgba(19,48,76,.42),transparent);color:var(--muted);font-size:.78rem;line-height:1.65}.side-note p{margin:0}.side-note strong{color:var(--muted-strong);font-size:.82rem}.side-note-icon{display:block;margin-bottom:10px;color:var(--teal)}.victory-card{display:flex;align-items:center;gap:17px;width:min(100%,660px);margin:22px auto 0;padding:16px 18px;border:1px solid rgba(93,224,208,.35);border-radius:17px;background:linear-gradient(105deg,#13464e7a,#0c2341cc);box-shadow:0 12px 35px #0000002e}.victory-orb{display:grid;place-items:center;width:42px;height:42px;flex:0 0 42px;border-radius:50%;background:#ffd1662e;color:var(--amber)}.victory-card .eyebrow{font-size:.63rem}.victory-card h2{margin:3px 0;font-size:1rem}.victory-card p:last-child{margin:0;color:var(--muted);font-size:.75rem}.primary-button.compact{min-height:42px;margin-left:auto;padding:0 13px;white-space:nowrap;font-size:.78rem}@media(max-width:900px){.game-layout{grid-template-columns:1fr;gap:16px}.side-note{display:none}}@media(max-width:600px){.menu-screen{padding:20px 16px}.menu-content{padding-top:9vh}h1{font-size:clamp(3rem,17vw,5rem)}.lead{margin-bottom:28px}.menu-actions{align-items:flex-start;flex-direction:column;gap:12px;margin-bottom:48px}.level-grid{grid-template-columns:repeat(5,1fr)}.menu-footer{align-items:flex-start;flex-direction:column;gap:14px}.game-screen{padding:14px 12px 24px}.back-button span{display:none}.game-header{margin-bottom:12px}.stats-row{gap:14px}.status-pill{padding:0 8px;font-size:.67rem}.board{border-radius:18px;gap:4px;padding:8px}.cell{min-width:44px;min-height:44px;border-radius:8px}.controls-row{margin-top:16px}.secondary-button{padding:0 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