*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #1a1a2e;--color-surface: #16213e;--color-surface2: #0f3460;--color-accent: #e94560;--color-text: #eaeaea;--color-text-muted: #888;--color-board: #2d7a2d;--color-board-line: #1a5c1a;--color-black-piece: #111;--color-white-piece: #f0f0f0;--color-legal: rgba(255, 255, 100, .35);--color-last-move: rgba(255, 220, 0, .7);--special-double: #FFF3B0;--special-jump: #B0E0FF;--special-convert: #FFB0C0;--board-size: min(90vw, 70vh, 480px);--cell-size: calc(var(--board-size) / 8)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--color-bg);color:var(--color-text);min-height:100vh;display:flex;flex-direction:column;align-items:center}#app{width:100%;max-width:600px;min-height:100vh;display:flex;flex-direction:column}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:opacity .2s,transform .1s;min-height:44px}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-accent);color:#fff}.btn-secondary{background:var(--color-surface2);color:var(--color-text)}.btn-danger{background:#c0392b;color:#fff}.top-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:32px 16px;gap:24px}.top-screen h1{font-size:clamp(24px,6vw,40px);text-align:center;background:linear-gradient(135deg,#e94560,#0f3460);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.top-screen .subtitle{color:var(--color-text-muted);text-align:center;font-size:14px}.top-actions{display:flex;flex-direction:column;gap:12px;width:100%;max-width:300px}.join-form{display:flex;gap:8px;width:100%;max-width:300px}.join-form input{flex:1;padding:12px 16px;border-radius:8px;border:2px solid var(--color-surface2);background:var(--color-surface);color:var(--color-text);font-size:16px;text-transform:uppercase;letter-spacing:2px;text-align:center;min-height:44px}.join-form input:focus{outline:none;border-color:var(--color-accent)}.rules-link{color:var(--color-accent);cursor:pointer;text-decoration:underline;font-size:14px}.waiting-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:32px 16px;gap:24px;text-align:center}.room-id-display{font-size:clamp(40px,12vw,72px);font-weight:900;letter-spacing:8px;color:var(--color-accent)}.room-url{background:var(--color-surface);padding:12px 16px;border-radius:8px;font-size:13px;color:var(--color-text-muted);word-break:break-all;width:100%;max-width:400px}.waiting-text{display:flex;align-items:center;gap:8px;color:var(--color-text-muted)}.dot-anim span{animation:dot-blink 1.4s infinite;opacity:0}.dot-anim span:nth-child(2){animation-delay:.2s}.dot-anim span:nth-child(3){animation-delay:.4s}@keyframes dot-blink{0%,80%,to{opacity:0}40%{opacity:1}}.game-screen{display:flex;flex-direction:column;align-items:center;padding:8px 8px 16px;gap:8px;flex:1}.game-header{width:100%;display:flex;flex-direction:column;align-items:center;gap:6px;padding:8px;background:var(--color-surface);border-radius:12px}.player-info{display:flex;align-items:center;gap:8px;font-size:14px}.piece-icon{width:20px;height:20px;border-radius:50%;display:inline-block}.piece-icon.black{background:var(--color-black-piece);border:2px solid #444}.piece-icon.white{background:var(--color-white-piece);border:2px solid #ccc}.turn-indicator{font-size:18px;font-weight:700;transition:color .3s}.turn-indicator.my-turn{color:#4ade80}.turn-indicator.opponent-turn{color:var(--color-text-muted)}.score-display{display:flex;gap:24px;font-size:15px}.score-item{display:flex;align-items:center;gap:6px}.score-value{font-size:20px;font-weight:700}.pass-notice{background:#ffa50033;border:1px solid orange;border-radius:8px;padding:8px 16px;font-size:14px;text-align:center;animation:fade-in .3s}.connection-status{font-size:12px;display:flex;align-items:center;gap:4px}.status-dot{width:8px;height:8px;border-radius:50%}.status-dot.online{background:#4ade80}.status-dot.reconnecting{background:orange;animation:pulse 1s infinite}.status-dot.offline{background:#f87171}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}.board-container{position:relative}.board{display:grid;grid-template-columns:repeat(8,var(--cell-size));grid-template-rows:repeat(8,var(--cell-size));border:3px solid var(--color-board-line);border-radius:4px;background:var(--color-board);gap:0;-webkit-user-select:none;user-select:none}.cell{width:var(--cell-size);height:var(--cell-size);border:1px solid var(--color-board-line);display:flex;align-items:center;justify-content:center;position:relative;cursor:default}.cell.legal{cursor:pointer}.cell.legal:hover{background:#ffffff1a}.cell.special-double{background-color:var(--special-double)}.cell.special-jump{background-color:var(--special-jump)}.cell.special-convert{background-color:var(--special-convert)}.special-icon{position:absolute;top:2px;right:2px;font-size:calc(var(--cell-size) * .22);font-weight:700;color:#00000080;pointer-events:none;line-height:1}.legal-marker{width:40%;height:40%;border-radius:50%;background:var(--color-legal);pointer-events:none}.cell.last-move:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border:3px solid var(--color-last-move);pointer-events:none;border-radius:2px}.piece{width:80%;height:80%;border-radius:50%;position:absolute;transform-style:preserve-3d;transition:transform .3s}.piece.black{background:radial-gradient(circle at 35% 35%,#555,#111);box-shadow:2px 3px 6px #0009}.piece.white{background:radial-gradient(circle at 35% 35%,#fff,#ccc);box-shadow:2px 3px 6px #0006}@keyframes piece-drop{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.piece.placing{animation:piece-drop .2s ease-out forwards}@keyframes flip-to-black{0%{transform:rotateY(0);background:radial-gradient(circle at 35% 35%,#fff,#ccc)}50%{transform:rotateY(90deg)}to{transform:rotateY(0);background:radial-gradient(circle at 35% 35%,#555,#111)}}@keyframes flip-to-white{0%{transform:rotateY(0);background:radial-gradient(circle at 35% 35%,#555,#111)}50%{transform:rotateY(90deg)}to{transform:rotateY(0);background:radial-gradient(circle at 35% 35%,#fff,#ccc)}}.piece.flipping-to-black{animation:flip-to-black .3s ease-in-out forwards}.piece.flipping-to-white{animation:flip-to-white .3s ease-in-out forwards}.game-footer{width:100%;display:flex;align-items:center;justify-content:space-between;padding:8px}.end-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:32px 16px;gap:24px;text-align:center}.result-title{font-size:clamp(28px,8vw,48px);font-weight:900}.result-win{color:#4ade80}.result-lose{color:var(--color-accent)}.result-draw{color:#fbbf24}.score-breakdown{background:var(--color-surface);border-radius:12px;padding:20px 32px;min-width:280px}.score-breakdown h3{margin-bottom:12px;color:var(--color-text-muted);font-size:14px}.score-row{display:flex;justify-content:space-between;padding:6px 0;font-size:16px}.score-row.total{border-top:1px solid var(--color-surface2);margin-top:8px;padding-top:12px;font-weight:700;font-size:20px}.end-actions{display:flex;flex-direction:column;gap:12px;width:100%;max-width:280px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.modal{background:var(--color-surface);border-radius:16px;padding:24px;max-width:480px;width:100%;max-height:80vh;overflow-y:auto}.modal h2{margin-bottom:16px;font-size:22px}.modal p,.modal li{line-height:1.7;color:var(--color-text-muted);font-size:14px}.modal ul{padding-left:20px;margin:8px 0}.special-tile-desc{border-radius:8px;padding:10px 14px;margin:8px 0}.special-tile-desc.double{background:var(--special-double);color:#333}.special-tile-desc.jump{background:var(--special-jump);color:#333}.special-tile-desc.convert{background:var(--special-convert);color:#333}.modal-close{margin-top:16px;width:100%}@keyframes fade-in{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.hidden{display:none!important}