html,body,#root{min-height:100%}:root{font-family:Helvetica Neue,Arial,sans-serif;line-height:1.4}*{box-sizing:border-box}body{color:#f8fafc;background:#0f172a;margin:0}.app{justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.container{width:100%;max-width:340px}.game-header{justify-content:space-between;align-items:flex-end;margin-bottom:12px;display:flex}.game-header h1{color:#38bdf8;margin:0;font-size:24px}.subtitle{color:#94a3b8;margin:0;font-size:12px}.score-area{text-align:right}.score-area span{color:#94a3b8;font-size:12px;display:block}.score-area strong{color:#7dd3fc;font-size:32px;line-height:1}.message-banner{text-align:center;color:#34d399;opacity:0;min-height:24px;margin-bottom:8px;font-size:14px;font-weight:700;transition:opacity .2s}.message-banner.visible{opacity:1}.board-container{margin:0 auto;position:relative}.board-wrapper{background:#1e293b;border:1px solid #475569;border-radius:10px;padding:4px}.ceiling{border-top:3px solid #38bdf8;margin-bottom:4px}.board{background:#334155;grid-template-columns:repeat(5,1fr);gap:1px;display:grid}.cell{aspect-ratio:1;color:#f8fafc;cursor:pointer;background:#1e293b;border:none;width:100%;padding:0;font-size:clamp(22px,6vw,28px);font-weight:700}.cell:disabled{cursor:default}.hand{grid-template-columns:repeat(5,1fr);gap:8px;margin-top:16px;display:grid}.hand-card{aspect-ratio:1;color:#e2e8f0;cursor:pointer;background:#334155;border:1px solid #475569;border-radius:10px;font-size:28px;font-weight:700}.hand-card.selected{color:#fff;background:#0284c7;box-shadow:0 0 0 3px #38bdf8}.hand-card:disabled{opacity:.8;cursor:default}.help-text{text-align:center;color:#94a3b8;margin-top:18px;font-size:12px}.game-over-overlay{background:#0f172aeb;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex;position:absolute;inset:0}.game-over-overlay p{color:#f43f5e;letter-spacing:.08em;margin:0;font-size:30px;font-weight:800}.game-over-overlay button{color:#fff;cursor:pointer;background:#0284c7;border:none;border-radius:8px;padding:10px 20px;font-size:16px;font-weight:700}