*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #0f0f1a;--color-surface: #1a1a2e;--color-surface2: #252540;--color-border: #3a3a5c;--color-text: #e0e0f0;--color-text-muted: #8888aa;--color-primary: #4fc3f7;--color-primary-dark: #0288d1;--color-danger: #ef5350;--color-danger-dark: #c62828;--color-success: #66bb6a;--color-black-piece: #111111;--color-white-piece: #f5f5f5;--color-board-bg: #16213e;--color-board-cell: #1a2845;--color-board-line: #2a3a6e;--color-last-move: #ffd600;--color-flipped: #42a5f5}html,body{height:100%;background-color:var(--color-bg);color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;-webkit-tap-highlight-color:transparent}#app{min-height:100vh;display:flex;flex-direction:column}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s,transform .1s;-webkit-user-select:none;user-select:none;touch-action:manipulation}.btn:active{transform:scale(.97)}.btn-primary{background:var(--color-primary);color:#0a0a1a}.btn-primary:hover{background:#80d8ff}.btn-secondary{background:var(--color-surface2);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover{background:#303060}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover{background:var(--color-danger-dark)}.btn-link{background:transparent;color:var(--color-primary);text-decoration:underline;padding:8px}.btn-lg{padding:14px 28px;font-size:17px}.top-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:24px}.top-content{display:flex;flex-direction:column;align-items:center;gap:28px;width:100%;max-width:420px}.top-logo{text-align:center}.logo-pieces{display:flex;justify-content:center;gap:8px;margin-bottom:16px}.logo-piece{width:36px;height:36px;border-radius:50%}.logo-piece.black{background:radial-gradient(circle at 35% 35%,#555,#111);box-shadow:0 2px 8px #00000080}.logo-piece.white{background:radial-gradient(circle at 35% 35%,#fff,#ccc);box-shadow:0 2px 8px #0006}.game-title{font-size:36px;font-weight:800;background:linear-gradient(135deg,#4fc3f7,#7c4dff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.5px}.game-subtitle{font-size:14px;color:var(--color-text-muted);margin-top:4px}.top-buttons{display:flex;flex-direction:column;gap:12px;width:100%}.top-buttons .btn{width:100%}.join-form{display:flex;gap:8px;width:100%}.join-form.hidden{display:none}.room-id-input{flex:1;padding:10px 14px;background:var(--color-surface2);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);font-size:16px;font-weight:700;letter-spacing:2px;text-transform:uppercase;outline:none}.room-id-input:focus{border-color:var(--color-primary)}.room-id-input.error{border-color:var(--color-danger);animation:shake .3s}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}75%{transform:translate(6px)}}.modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;align-items:center;justify-content:center}.modal.hidden{display:none}.modal-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#000000b3;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-content{position:relative;background:var(--color-surface);border:1px solid var(--color-border);border-radius:16px;padding:28px;max-width:480px;width:calc(100% - 32px);max-height:80vh;overflow-y:auto}.modal-content h2{margin-bottom:20px;font-size:22px}.rules-body h3{font-size:15px;color:var(--color-primary);margin-top:16px;margin-bottom:6px}.rules-body p{font-size:14px;color:var(--color-text-muted);line-height:1.7}.waiting-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:28px;padding:24px}.waiting-title{font-size:22px;color:var(--color-primary)}.room-id-display{text-align:center;background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px;padding:20px 40px}.room-id-label{font-size:12px;color:var(--color-text-muted);margin-bottom:8px;text-transform:uppercase;letter-spacing:1px}.room-id-value{font-size:40px;font-weight:800;letter-spacing:6px;color:var(--color-primary)}.share-section{display:flex;flex-direction:column;align-items:center;gap:10px;width:100%;max-width:400px}.share-url{font-size:12px;color:var(--color-text-muted);word-break:break-all;background:var(--color-surface2);padding:8px 12px;border-radius:6px;width:100%;text-align:center}.copy-notice{font-size:13px;color:var(--color-success)}.copy-notice.hidden{display:none}.waiting-status{display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--color-text-muted)}.spinner{width:36px;height:36px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.game-screen{display:flex;flex-direction:column;min-height:100vh}.game-header{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-wrap:wrap}.player-info{display:flex;align-items:center;gap:8px;font-size:14px}.piece-icon{display:inline-block;width:20px;height:20px;border-radius:50%}.piece-icon.black{background:radial-gradient(circle at 35% 35%,#555,#111);box-shadow:0 1px 4px #00000080}.piece-icon.white{background:radial-gradient(circle at 35% 35%,#fff,#bbb);box-shadow:0 1px 4px #0000004d}.turn-indicator{flex:1;text-align:center;font-size:14px;font-weight:700;padding:4px 10px;border-radius:20px}.turn-indicator.my-turn{background:#4fc3f726;color:var(--color-primary)}.turn-indicator.opponent-turn,.turn-indicator.ended{color:var(--color-text-muted)}.score-display{display:flex;align-items:center;gap:8px;font-size:16px;font-weight:700}.score-item{display:flex;align-items:center;gap:4px}.score-sep{color:var(--color-text-muted)}.score-value{min-width:24px;text-align:center}.connection-status{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--color-text-muted)}.status-dot{width:8px;height:8px;border-radius:50%}.status-dot.online{background:var(--color-success)}.status-dot.reconnecting{background:#ffa726;animation:blink 1s infinite}.status-dot.offline{background:var(--color-danger)}@keyframes blink{50%{opacity:.3}}.notice-bar{padding:10px 16px;background:#ef535026;border-bottom:1px solid rgba(239,83,80,.3);font-size:13px;color:#ff8a80;text-align:center}.notice-bar.hidden{display:none}.board-area{flex:1;display:flex;align-items:center;justify-content:center;padding:12px}.board-wrapper{position:relative;overflow:hidden;display:inline-flex;flex-direction:column;gap:0;background:var(--color-board-bg);border-radius:10px;border:2px solid var(--color-board-line);padding:4px;box-shadow:0 8px 32px #00000080}.board-selector-row{display:grid;grid-template-columns:repeat(7,1fr);gap:3px;margin-bottom:4px}.col-selector{display:flex;align-items:center;justify-content:center;height:32px;border-radius:6px;font-size:16px;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background .12s;color:var(--color-text-muted)}.col-selector.active{color:var(--color-primary);cursor:pointer}.col-selector.active:hover{background:#4fc3f726}.col-selector.inactive{opacity:.3;cursor:default}.col-selector.full{color:var(--color-danger);cursor:not-allowed;font-size:14px}.board-grid{display:grid;grid-template-columns:repeat(7,1fr);grid-template-rows:repeat(6,1fr);gap:3px}.board-cell{width:clamp(36px,calc((min(90vw,420px)) / 7),60px);height:clamp(36px,calc((min(90vw,420px)) / 7),60px);border-radius:50%;background:var(--color-board-cell);border:1px solid var(--color-board-line);transition:border-color .2s;position:relative;cursor:pointer}.board-cell.black{background:radial-gradient(circle at 35% 35%,#555,#111);box-shadow:inset 0 2px 4px #ffffff0d,0 2px 4px #00000080;border-color:#333}.board-cell.white{background:radial-gradient(circle at 35% 35%,#fff,#ccc);box-shadow:inset 0 2px 4px #fff9,0 2px 4px #0000004d;border-color:#bbb}.board-cell.preview-b{background:#11111173;border-color:#4fc3f780}.board-cell.preview-w{background:#f5f5f573;border-color:#4fc3f780}.board-cell.last-move{border-color:var(--color-last-move)!important;border-width:2px;box-shadow:0 0 8px var(--color-last-move)}.board-cell.flipped-highlight{border-color:var(--color-flipped)!important;border-width:2px;box-shadow:0 0 8px var(--color-flipped)}.falling-piece{border-radius:50%;pointer-events:none;z-index:10}.falling-piece.black{background:radial-gradient(circle at 35% 35%,#555,#111);box-shadow:0 2px 8px #0009}.falling-piece.white{background:radial-gradient(circle at 35% 35%,#fff,#ccc);box-shadow:0 2px 8px #0006}.board-cell.flipping{animation:flip-piece .3s ease-in-out forwards}@keyframes flip-piece{0%{transform:rotateY(0)}50%{transform:rotateY(90deg);opacity:.5}to{transform:rotateY(0)}}.game-footer{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--color-surface);border-top:1px solid var(--color-border)}.remaining-info{font-size:13px;color:var(--color-text-muted)}.end-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:24px}.end-content{display:flex;flex-direction:column;align-items:center;gap:32px;width:100%;max-width:400px}.result-banner{width:100%;padding:24px;border-radius:16px;text-align:center}.result-banner.win{background:linear-gradient(135deg,#66bb6a33,#66bb6a0d);border:2px solid rgba(102,187,106,.5)}.result-banner.lose{background:linear-gradient(135deg,#ef535033,#ef53500d);border:2px solid rgba(239,83,80,.4)}.result-banner.draw{background:linear-gradient(135deg,#4fc3f733,#4fc3f70d);border:2px solid rgba(79,195,247,.4)}.result-text{font-size:28px;font-weight:800}.final-score{display:flex;align-items:center;justify-content:center;gap:20px}.score-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px 28px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px}.score-card.my-score{border-color:var(--color-primary);background:#4fc3f714}.score-card-sep{font-size:20px;color:var(--color-text-muted);font-weight:700}.score-piece{width:40px;height:40px;border-radius:50%}.score-piece.black{background:radial-gradient(circle at 35% 35%,#555,#111);box-shadow:0 2px 8px #00000080}.score-piece.white{background:radial-gradient(circle at 35% 35%,#fff,#bbb);box-shadow:0 2px 8px #0000004d}.score-number{font-size:36px;font-weight:800;color:var(--color-text)}.score-label{font-size:13px;color:var(--color-text-muted)}.end-buttons{display:flex;flex-direction:column;gap:12px;width:100%}.end-buttons .btn{width:100%}@media (max-width: 480px){.game-header{gap:8px;padding:8px 12px}.game-title{font-size:28px}.room-id-value{font-size:32px}.board-cell{width:calc(90vw / 7 - 3px);height:calc(90vw / 7 - 3px)}.col-selector{height:28px;font-size:14px}}@media (min-height: 700px){.board-area{padding:16px}}