:root{--bg:#eef6ff;--bg-accent:#fff6e0;--panel:#fff;--text:#24324a;--muted:#7a8aa3;--primary:#4f8cff;--hint:#2fbf71;--undo:#ffb020;--new:#ff6b8b;--pgn:#8b6bff;--radius:18px;--shadow:0 6px 18px #283c5a1f;color:var(--text);font-family:Fredoka,Segoe UI,system-ui,sans-serif}*{box-sizing:border-box}body{background:radial-gradient(circle at 10% 10%, var(--bg-accent), transparent 40%), var(--bg);min-height:100vh;margin:0}button{font:inherit}.app{max-width:1100px;margin:0 auto;padding:16px}.app-header{text-align:center;margin-bottom:12px}.app-header h1{color:var(--primary);letter-spacing:1px;margin:0;font-size:clamp(2rem,6vw,2.8rem)}.app-header p{color:var(--muted);margin:4px 0 0;font-size:1.1rem}.layout{grid-template-columns:minmax(0,1fr) 320px;align-items:start;gap:20px;display:grid}.board-column{flex-direction:column;gap:10px;min-width:0;display:flex}.side-column{flex-direction:column;gap:16px;display:flex}.board-wrap{width:100%;max-width:620px;margin:0 auto;position:relative}.status-area{flex-direction:column;gap:8px;min-height:110px;display:flex}.status{border-radius:var(--radius);background:var(--panel);box-shadow:var(--shadow);padding:12px 16px;font-size:1.15rem;font-weight:500}.status-warn{color:#9a5a00;background:#fff1d6}.status-win{color:#11683a;background:#d8f7e4;font-size:1.35rem}.status-lose{color:#a3203f;background:#ffe1e7}.status-draw{color:#4b30a8;background:#ece6ff}.status-error{color:#a3203f;background:#ffe1e7;justify-content:space-between;gap:8px;display:flex}.bubble{border-radius:var(--radius);background:#f3f7ff;border:2px dashed #c6d7ff;padding:10px 14px;font-size:1rem}.hint-bubble{background:#e6f9ee;border-color:#9ee2bc}.link{cursor:pointer;color:inherit;background:0 0;border:0;font-size:1rem}.captured{background:var(--panel);box-shadow:var(--shadow);border-radius:12px;align-items:center;gap:10px;width:100%;max-width:620px;margin:0 auto;padding:6px 12px;display:flex}.captured-label{white-space:nowrap;font-weight:600}.captured-pieces{letter-spacing:-2px;white-space:nowrap;flex:1;font-size:1.5rem;line-height:1;overflow:hidden}.captured-pieces .muted{letter-spacing:0;font-size:.95rem}.advantage{background:var(--hint);color:#fff;border-radius:999px;padding:2px 10px;font-weight:600}.muted{color:var(--muted)}.panel{background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.panel h2{margin:16px 0 8px;font-size:1.1rem}.panel h2:first-child{margin-top:0}.button-row{grid-template-columns:repeat(3,1fr);gap:8px;display:grid}.btn{color:#fff;cursor:pointer;border:0;border-radius:14px;justify-content:center;align-items:center;gap:6px;padding:12px 8px;font-size:1rem;font-weight:600;text-decoration:none;transition:transform .1s,filter .1s;display:inline-flex;box-shadow:0 4px #00000026}.btn:hover:not(:disabled){filter:brightness(1.07);transform:translateY(-1px)}.btn:active:not(:disabled){transform:translateY(2px);box-shadow:0 2px #00000026}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-hint{background:var(--hint)}.btn-undo{background:var(--undo)}.btn-new{background:var(--new)}.btn-pgn{background:var(--pgn);width:100%;margin-top:16px}.color-pick{grid-template-columns:1fr 1fr;gap:6px;display:grid}.level{cursor:pointer;text-align:left;color:var(--text);background:#f8fbff;border:2px solid #dde6f5;border-radius:12px;align-items:center;gap:8px;padding:6px 10px;display:flex}.level:hover:not(:disabled){border-color:var(--primary)}.level.active{border-color:var(--primary);background:#e3edff;font-weight:600}.level:disabled{opacity:.6;cursor:wait}.history ol{max-height:240px;margin:0;padding:0;font-family:ui-monospace,Cascadia Mono,monospace;list-style:none;overflow-y:auto}.history li{border-radius:6px;grid-template-columns:3ch 1fr 1fr;gap:8px;padding:4px 6px;display:grid}.history li:nth-child(odd){background:#f4f7fc}.move-no{color:var(--muted)}.promotion-overlay{z-index:10;background:#24324a73;border-radius:14px;place-items:center;display:grid;position:absolute;inset:0}.promotion-card{border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);background:#fff;padding:16px 20px}.promotion-card h3{margin:0 0 4px}.promotion-card p{color:var(--muted);margin:0 0 12px}.promotion-choices{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.promotion-choices button{cursor:pointer;background:#f8fbff;border:2px solid #dde6f5;border-radius:12px;flex-direction:column;align-items:center;padding:8px;display:flex}.promotion-choices button:hover{border-color:var(--primary)}.promotion-choices .glyph{font-size:2.4rem;line-height:1}@media (width<=860px){.layout{grid-template-columns:1fr}}@media (width<=480px){.app{padding:10px}.status{font-size:1rem}.btn{padding:10px 4px;font-size:.95rem}}.level-stepper{align-items:center;gap:5px;display:flex}.step{background:var(--primary);color:#fff;cursor:pointer;border:0;border-radius:10px;flex:none;width:36px;height:44px;font-size:1.1rem;box-shadow:0 3px #00000026}.step:disabled{opacity:.4;cursor:not-allowed}.level-current{background:#e3edff;border-radius:12px;flex:1;justify-content:center;align-items:center;gap:8px;min-width:0;min-height:44px;padding:6px 10px;display:flex}.level-current>span:last-child{flex-direction:column;line-height:1.15;display:flex}.level-current-emoji{font-size:1.7rem}.level-current-name{color:var(--muted);font-size:.9rem}.tier-tabs{flex-wrap:wrap;gap:6px;margin-top:12px;display:flex}.tier-tab{color:var(--text);cursor:pointer;background:#f8fbff;border:2px solid #dde6f5;border-radius:999px;padding:5px 10px;font-size:.9rem;position:relative}.tier-tab:hover{border-color:var(--primary)}.tier-tab.active{background:var(--primary);border-color:var(--primary);color:#fff}.tier-tab.has-current:not(.active):after{content:"";background:var(--new);border-radius:50%;width:7px;height:7px;position:absolute;top:2px;right:4px}.level-desc{color:var(--muted);margin:10px 0 8px;font-size:.9rem}.level-desc strong{color:var(--text)}.level-up{background:var(--hint);color:#fff;cursor:pointer;border:0;border-radius:12px;margin-top:8px;padding:8px 14px;font-size:1rem;font-weight:600;box-shadow:0 3px #00000026}.tier-slider input[type=range]{width:100%;accent-color:var(--primary);cursor:pointer;height:28px}.tier-slider input.inactive{opacity:.45}.tier-slider-labels{color:var(--muted);justify-content:space-between;align-items:center;gap:8px;font-size:.85rem;display:flex}.link-btn{color:var(--primary);cursor:pointer;background:0 0;border:0;padding:0;font-size:.85rem;font-weight:600;text-decoration:underline}.link-btn:disabled{opacity:.5;cursor:wait}