.cell.selected{box-shadow:none;z-index:1;background:#e9e2ee!important}:root{--black:#000;--blackberry-cream:#502f4c;--dusty-lavender:#70587c;--thistle:#c8b8db;--snow:#f9f4f5;--bg:var(--snow);--surface:#fffc;--muted:var(--thistle);--accent:var(--blackberry-cream);--primary-text:var(--black);--secondary-text:var(--dusty-lavender);--cell-bg:white;--cell-initial-bg:var(--thistle)}*{box-sizing:border-box}html,body,#root{height:100%}body{background:linear-gradient(180deg,var(--snow)0%,#f4eef0 100%);color:var(--primary-text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial}main.app-root{flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}h1.app-title{letter-spacing:-.02em;color:var(--blackberry-cream);margin:0 0 24px;font-size:28px}.board-card{background:var(--surface);border:1px solid #70587c0f;border-radius:12px;padding:18px;box-shadow:0 6px 18px #502f4c14}.sudoku-board{border:4px solid var(--blackberry-cream);box-sizing:content-box;background:0 0;grid-template-rows:repeat(9,66px);grid-template-columns:repeat(9,66px);gap:0;padding:0;display:grid}.cell{appearance:none;text-align:center;background:var(--cell-bg);width:66px;height:66px;color:var(--dusty-lavender);caret-color:#0000;box-sizing:border-box;border:1px solid #70587c1f;border-radius:0;outline:none;justify-content:center;align-items:center;font-size:28px;font-weight:500;line-height:1;display:flex}.cell:focus{box-shadow:none;background:#fff;outline:none}.cell.initial{background:var(--cell-initial-bg);color:var(--black);font-weight:700}.cell.thick-right{border-right-width:4px;border-right-color:var(--blackberry-cream)}.cell.thick-bottom{border-bottom-width:4px;border-bottom-color:var(--blackberry-cream)}.controls{justify-content:center;gap:12px;margin-top:16px;display:flex}.btn{cursor:pointer;background:var(--accent);color:var(--snow);border:none;border-radius:8px;padding:10px 14px;font-weight:600;box-shadow:0 6px 14px #502f4c14}.btn.ghost{color:var(--accent);background:0 0;border:1px solid #502f4c14}@media (max-width:900px){.sudoku-board{grid-template-rows:repeat(9,36px);grid-template-columns:repeat(9,36px)}.cell{width:36px;height:36px;font-size:16px}}