:root{--font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;--bg: #f5f5f5;--surface: #ffffff;--surface-muted: #f4f4f5;--surface-hover: #ededee;--text: #0a0a0a;--text-secondary: #404040;--text-muted: #737373;--border: #e5e5e5;--border-strong: #d4d4d4;--primary: #0a0a0a;--primary-hover: #262626;--primary-text: #ffffff;--danger: #b91c1c;--online: #16a34a;--radius-sm: 8px;--radius: 10px;--radius-lg: 16px;--control-h: 44px;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .05);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04), 0 2px 8px rgba(0, 0, 0, .05);--shadow: 0 1px 3px rgba(0, 0, 0, .04), 0 8px 24px rgba(0, 0, 0, .06);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .06), 0 24px 48px rgba(0, 0, 0, .12);--focus-ring: 0 0 0 3px rgba(10, 10, 10, .14)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:clamp(8px,3vw,24px);color:var(--text);line-height:1.4}body.game-page{align-items:stretch;padding:0}body.game-page:has(.lobby-card){align-items:center;padding:clamp(8px,3vw,24px)}#app{width:100%}button,input{font-family:inherit}a{color:var(--text);text-decoration:underline;text-underline-offset:2px;font-weight:600}a:hover{color:var(--text-secondary)}.lobby-card{width:100%;max-width:560px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:clamp(24px,5vw,40px) 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.15s;white-space:nowrap}.copy-btn:hover{background:var(--surface-muted)}.copy-btn:focus-visible{outline:none;box-shadow:var(--focus-ring)}.time-grid{display:flex;flex-direction:column;gap:10px}.time-row{display:grid;grid-template-columns:120px 1fr;align-items:center;gap:12px}.time-label{font-size:14px;font-weight:500;color:var(--text-secondary)}.time-input-wrap{display:flex;align-items:stretch;height:var(--control-h);background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius);box-shadow:var(--shadow-xs);overflow:hidden;transition:border-color .15s,box-shadow .15s}.time-input-wrap:focus-within{border-color:var(--text);box-shadow:var(--focus-ring)}.num-step{flex:0 0 var(--control-h);padding:0;font-size:18px;font-weight:400;line-height:1;color:var(--text);background:transparent;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,color 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translateY(0)}.lobby-list{list-style:none;margin:0;display:flex;flex-direction:column;gap:8px;max-height:min(58vh,420px);overflow-y:auto;overscroll-behavior:contain;padding:2px;scrollbar-width:thin;scrollbar-color:var(--border-strong) transparent}.lobby-list::-webkit-scrollbar{width:8px}.lobby-list::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:4px}.lobby-item{display:flex;align-items:center;gap:12px;padding:10px 10px 10px 14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-xs);transition:border-color .15s,box-shadow .15s}.lobby-item:hover{border-color:var(--border-strong);box-shadow:var(--shadow-sm)}.lobby-item-main{flex:1 1 auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-width:0}.lobby-item 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16px;background:var(--bg);color:var(--text);overflow:hidden}.game-desktop{display:flex;flex-direction:column;flex:1;min-height:0}.game-mobile{display:none}.game-layout{display:grid;grid-template-columns:1fr 280px;gap:12px;flex:1;min-height:0;align-items:stretch}.board-table{display:grid;grid-template-columns:1fr;padding:12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);min-height:0}.board-wrap{display:flex;align-items:center;justify-content:center;min-height:0}.board-canvas{height:100%;max-height:100%;aspect-ratio:10 / 8;width:auto;display:block;border-radius:4px}.game-status-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:0 4px;margin-bottom:10px;font-size:13px;font-weight:500;color:var(--text-muted);flex-shrink:0;font-variant-numeric:tabular-nums}.game-title{font-size:15px;font-weight:800;letter-spacing:.32em;color:var(--text)}.game-banner{padding:10px 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.15s}.clock-half.active{background:var(--primary);color:var(--primary-text)}.clock-divider{display:none}.clock-half-name{font-size:13px;font-weight:600;color:inherit;margin-bottom:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:flex;align-items:center;justify-content:center;gap:6px}.presence-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--border-strong);flex-shrink:0}.presence-dot.online{background:var(--online)}.clock-half-label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);font-weight:500;margin-bottom:4px}.clock-half.active .clock-half-label,.clock-half.active .clock-half-byo{color:#ffffffa6}.clock-half-time{font-size:26px;font-weight:700;color:inherit;font-variant-numeric:tabular-nums;letter-spacing:-.01em;line-height:1.1}.clock-half-byo{font-size:11px;color:var(--text-muted);margin-top:2px;font-weight:500}.move-list{list-style:none;flex:1 1 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.15s;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn-control i{font-size:12px;width:14px;text-align:center;color:var(--text-secondary)}.btn-control:hover:not(:disabled){background:var(--surface-muted)}.btn-control:disabled{opacity:.45;cursor:not-allowed}.btn-control.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-control.btn-danger i{color:#fff}.btn-control.btn-danger:hover:not(:disabled){background:#991b1b}.game-sidebar{display:flex;flex-direction:column;gap:10px;min-height:0}.sidebar-nav{display:flex;gap:6px;margin-top:auto}.sidebar-nav .btn-control{flex:1 1 0}.sidebar-nav .game-header-mute{flex:0 0 38px;padding:0}.stack{display:flex;flex-direction:column;gap:10px}.center-text{text-align:center;color:var(--text-muted);font-size:14px}.player-tag{font-family:var(--mono);font-size:13px;font-weight:600;color:var(--text);background:var(--surface-muted);border:1px solid var(--border);border-radius:6px;padding:2px 8px;margin-left:2px}@media(max-width:520px){.lobby-item{flex-direction:column;align-items:stretch;gap:10px;padding:12px}.lobby-item-main{row-gap:6px}.lobby-item-join{width:100%;min-height:var(--control-h)}}@media(max-width:500px){.lobby-title{font-size:24px}.lobby-subtitle{font-size:14px;margin-bottom:24px}.time-row{grid-template-columns:92px 1fr}.color-option{padding:14px 6px 12px}.color-piece{width:32px;height:32px}}@media(max-width:380px){.button-row{flex-direction:column-reverse;gap:8px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition-duration:.01ms!important}}@media(max-width:900px){.game-desktop{display:none}.game-mobile{display:flex;flex-direction:column;flex:1;min-height:0;gap:8px}.game-fullscreen{padding:8px}.game-mobile-header{display:flex;align-items:center;gap:8px}.game-header-back,.game-header-mute{flex:0 0 40px;min-height:40px;padding:0;font-size:14px}.game-header-title{flex:1 1 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#fde68a}.banner-error{background:var(--primary);color:var(--primary-text)}.offer-modal{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;padding:16px;background:#0a0a0a52;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);z-index:200}.offer-modal-card{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:22px 24px 20px;width:340px;max-width:100%}.offer-modal-card h3{margin:0 0 6px;font-size:17px;font-weight:700}.offer-modal-card p{margin:0 0 20px;font-size:14px;color:var(--text-muted)}.offer-modal-actions{display:flex;flex-direction:row-reverse;gap:8px}.offer-modal-actions .btn,.offer-modal-actions .btn-control{flex:1;min-height:40px}