:root{color-scheme:light;--page-bg: #f4f1eb;--page-gradient-a: rgba(62, 70, 82, .08);--page-gradient-b: rgba(151, 119, 75, .07);--text: #20252b;--muted: #6c7178;--panel: rgba(255, 253, 248, .9);--panel-solid: #fffdf8;--panel-border: rgba(32, 37, 43, .12);--panel-shadow: rgba(32, 37, 43, .09);--eyebrow: #6f5736;--pill-bg: #ece5d8;--pill-text: #5b4930;--upload-bg: #ebe6dd;--upload-gradient-a: rgba(255, 253, 248, .78);--upload-gradient-b: rgba(235, 230, 221, .9);--button-border: rgba(32, 37, 43, .15);--ghost-text: #515860;--primary: #475875;--primary-hover: #35445e;--answer-bg: #20252b;--step-bg: #fffdf8;--step-number-bg: #e5d5bc;--step-number-text: #60471f;--verification-bg: #e5e9ef;--verification-text: #2f425b;--warning-bg: #f6ead0;--warning-text: #6b4b12;--danger-bg: #f4dfdc;--danger-text: #953b34;--empty-text: #7c807e;--media-bg: #15181d;--crop-line: #fffdf8;--active-ring: rgba(71, 88, 117, .16);--success-bg: #dfeade;--success-text: #31563a;--review-bg: #f1e2c3;--review-text: #674811;--neutral-bg: #e7e5df;--neutral-text: #555b60;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--page-bg);color:var(--text);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}[data-theme=dark]{color-scheme:dark;--page-bg: #111316;--page-gradient-a: rgba(98, 111, 137, .12);--page-gradient-b: rgba(162, 126, 79, .09);--text: #f0eee8;--muted: #aaa9a4;--panel: rgba(25, 28, 32, .93);--panel-solid: #191c20;--panel-border: rgba(240, 238, 232, .13);--panel-shadow: rgba(0, 0, 0, .38);--eyebrow: #c5a46e;--pill-bg: #28241d;--pill-text: #e8d4ae;--upload-bg: #14171b;--upload-gradient-a: rgba(30, 34, 39, .88);--upload-gradient-b: rgba(20, 23, 27, .96);--button-border: rgba(240, 238, 232, .15);--ghost-text: #c5c3bd;--primary: #526381;--primary-hover: #637592;--answer-bg: #0b0d10;--step-bg: #15181c;--step-number-bg: #342a1c;--step-number-text: #e6c797;--verification-bg: #1b2430;--verification-text: #c7d5ea;--warning-bg: #342816;--warning-text: #f0d39d;--danger-bg: #321918;--danger-text: #efbbb5;--empty-text: #989995;--media-bg: #0b0d10;--crop-line: #f0eee8;--active-ring: rgba(99, 117, 146, .2);--success-bg: #17291d;--success-text: #b9dcbd;--review-bg: #352915;--review-text: #efd39c;--neutral-bg: #272a2e;--neutral-text: #d3d1ca}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:var(--page-bg);color:var(--text)}button,input{font:inherit}button{border:0}.app-shell{min-height:100vh;padding:32px;background:linear-gradient(115deg,var(--page-gradient-a),transparent 42%),linear-gradient(245deg,var(--page-gradient-b),transparent 38%),var(--page-bg)}.solver-layout{display:grid;grid-template-columns:minmax(360px,.86fr) minmax(420px,1.14fr);gap:24px;max-width:1380px;margin:0 auto}.capture-panel,.solution-panel,.history-panel{border:1px solid var(--panel-border);border-color:var(--panel-border);border-radius:8px;background:var(--panel);box-shadow:0 18px 55px var(--panel-shadow)}.capture-panel{display:flex;flex-direction:column;min-height:calc(100vh - 64px);overflow:hidden}.app-header{display:grid;gap:18px;padding:28px}.header-actions{display:flex;flex-wrap:wrap;gap:10px}.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 10px;color:var(--eyebrow);font-size:.78rem;font-weight:800;text-transform:uppercase}h1,h2,p{margin-top:0}h1{max-width:560px;margin-bottom:0;font-size:3.5rem;line-height:1.02;letter-spacing:0}h2{margin-bottom:0;font-size:1.35rem;line-height:1.2;letter-spacing:0}.trust-pill,.status-badge{display:inline-flex;flex:0 0 auto;align-items:center;gap:8px;min-height:36px;padding:0 12px;border-radius:999px;background:var(--pill-bg);color:var(--pill-text);font-size:.84rem;font-weight:800;white-space:nowrap}.theme-toggle{display:inline-flex;flex:0 0 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#00000052;touch-action:none}.crop-handle-nw{top:-12px;left:-12px;cursor:nwse-resize}.crop-handle-n{top:-12px;left:calc(50% - 11px);cursor:ns-resize}.crop-handle-ne{top:-12px;right:-12px;cursor:nesw-resize}.crop-handle-e{top:calc(50% - 11px);right:-12px;cursor:ew-resize}.crop-handle-se{right:-12px;bottom:-12px;cursor:nwse-resize}.crop-handle-s{bottom:-12px;left:calc(50% - 11px);cursor:ns-resize}.crop-handle-sw{bottom:-12px;left:-12px;cursor:nesw-resize}.crop-handle-w{top:calc(50% - 11px);left:-12px;cursor:ew-resize}.crop-actions{display:flex;gap:10px}.icon-text-button{padding:0 14px}.empty-upload{display:flex;flex-direction:column;align-items:center;gap:14px;color:var(--ghost-text);font-weight:800}.capture-actions{display:flex;gap:10px;margin-top:16px}.secondary-button,.ghost-button,.solve-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;border-radius:8px;cursor:pointer;font-weight:800;transition:transform .18s ease,background .18s 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p{margin-bottom:0;color:var(--text);line-height:1.55}.verification-box,.warning-box{margin-top:14px;padding:14px;border-radius:8px}.verification-box{background:var(--verification-bg);color:var(--verification-text)}.verification-box p,.verification-box strong{display:block;margin:0;color:var(--verification-text)}.warning-box{background:var(--warning-bg);color:var(--warning-text)}.warning-box p{margin-bottom:0;line-height:1.45}.empty-solution{display:grid;place-items:center;min-height:300px;color:var(--empty-text)}.history-list{display:grid;gap:10px;margin-top:18px}.history-item{display:grid;grid-template-columns:1fr 44px;gap:10px;align-items:center;padding:8px;border:1px solid var(--panel-border);border-color:var(--panel-border);border-radius:8px;background:var(--panel-solid)}.history-item.active{border-color:var(--primary);box-shadow:0 0 0 2px var(--active-ring)}.history-open{display:grid;grid-template-columns:76px 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spin{to{transform:rotate(360deg)}}@media(max-width:1080px){.solver-layout{grid-template-columns:1fr}.capture-panel{min-height:auto}}@media(max-width:680px){.app-shell{padding:14px}.app-header,.panel-heading,.history-heading{flex-direction:column}.theme-toggle,.trust-pill{align-self:flex-start}h1{font-size:2.55rem}.answer-band strong{font-size:1.4rem}.app-header,.capture-surface,.solution-panel,.history-panel{padding:18px}.upload-zone,.crop-stage{min-height:300px}.capture-actions{display:grid;grid-template-columns:1fr 1fr 44px}.crop-actions{display:grid;grid-template-columns:1fr}.results-panel{grid-template-rows:auto}.history-open{grid-template-columns:64px 1fr}.history-open img{width:64px;height:54px}}