*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#e8e8e8;--text:#222;--header-bg:#f5f5f5;--header-border:#ccc;--surface:#fff;--surface-border:#ddd;--board-bg:#111;--accent:#4a90d9;--modal-bg:#fff;--modal-text:#222;--overlay-bg:rgba(0,0,0,0.4)}
[data-theme="dark"]{--bg:#1a1a2e;--text:#e0e0e0;--header-bg:#16213e;--header-border:#0f3460;--surface:#1e293b;--surface-border:#334155;--board-bg:#0a0a0a;--modal-bg:#16213e;--modal-text:#e0e0e0;--overlay-bg:rgba(0,0,0,0.6)}
html,body{height:100%;font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);-webkit-user-select:none;user-select:none}
body{display:flex;justify-content:center}
.app{width:100%;max-width:600px;display:flex;flex-direction:column;align-items:center}
.app-header{width:100%;display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--header-bg);border-bottom:1px solid var(--header-border)}
.app-title{font-size:1.25rem;font-weight:700}
.icon-btn{background:none;border:none;cursor:pointer;color:var(--text);padding:6px;border-radius:8px;display:flex;align-items:center;justify-content:center;width:36px;height:36px}
.icon-btn:hover{background:rgba(128,128,128,0.15)}
.icon-btn svg{width:20px;height:20px}
[data-theme="light"] .icon-moon{display:none}
[data-theme="dark"] .icon-sun{display:none}
[data-theme="dark"] .icon-moon{display:block}
.game-container{padding:16px;display:flex;flex-direction:column;align-items:center;gap:12px}
.game-layout{display:flex;gap:12px;align-items:flex-start}
.side-panel{display:flex;flex-direction:column;gap:8px}
.stat-box{background:var(--surface);border:1px solid var(--surface-border);border-radius:10px;padding:10px 14px;text-align:center;min-width:80px}
.stat-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;opacity:.6;margin-bottom:4px}
.stat-value{font-size:1.2rem;font-weight:700}
.next-box{padding:10px 6px}
.board-wrapper{position:relative;border:3px solid var(--surface-border);border-radius:4px;background:var(--board-bg);line-height:0}
.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.6)}
.overlay.hidden{display:none}
.overlay-text{color:#fff;font-size:1.2rem;font-weight:700;text-align:center}
#preview{display:block;margin:4px auto 0}
#holdCanvas{display:block;margin:4px auto 0}
.controls{display:flex;gap:8px}
.action-btn{padding:8px 24px;font-family:inherit;font-size:.875rem;font-weight:600;border:1px solid var(--surface-border);border-radius:8px;background:var(--surface);color:var(--text);cursor:pointer}
.action-btn:disabled{opacity:.4;cursor:default}
.action-btn:hover:not(:disabled){background:var(--accent);color:#fff;border-color:var(--accent)}
.touch-controls{display:none;flex-wrap:wrap;gap:8px;justify-content:center;max-width:280px}
.touch-btn{width:60px;height:50px;font-size:1.3rem;border:1px solid var(--surface-border);border-radius:10px;background:var(--surface);color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:center}
.touch-btn.wide{width:128px;font-size:.9rem;font-weight:600}
.touch-btn:active{background:var(--accent);color:#fff}
@media (hover:none) and (pointer:coarse){.touch-controls{display:flex}}
.modal-overlay{position:fixed;inset:0;background:var(--overlay-bg);display:none;align-items:center;justify-content:center;z-index:100}
.modal-overlay.active{display:flex}
.modal{background:var(--modal-bg);color:var(--modal-text);border-radius:16px;padding:32px 28px;text-align:center;max-width:320px;width:90%;box-shadow:0 12px 40px rgba(0,0,0,0.2)}
.win-icon{font-size:48px;margin-bottom:8px}
.modal-title{font-size:1.25rem;font-weight:700;margin-bottom:12px}
.win-stats{display:flex;justify-content:center;gap:32px;margin-bottom:20px}
.play-again-btn{width:100%;padding:12px;font-family:inherit;font-size:1rem;font-weight:600;border:none;border-radius:10px;background:var(--accent);color:#fff;cursor:pointer}
.play-again-btn:hover{opacity:.9}