:root{color-scheme:dark;font-family:Avenir Next,Segoe UI Variable,Segoe UI,system-ui,sans-serif;color:#f7f9ff;background:#080d18;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #080d18;--panel: rgba(17, 27, 49, .78);--panel-solid: #111b31;--line: rgba(255, 255, 255, .1);--muted: #91a0bb;--sun: #ffd166;--sun-bright: #ffe399;--coral: #ff5d73;--coral-bright: #ff8c9b;--aqua: #6ee7f9;--board: #263f7a;--board-light: #34559e;--shadow: rgba(0, 0, 0, .34)}:root[data-theme=light]{color-scheme:light;color:#172035;background:#edf3fc;--ink: #edf3fc;--panel: rgba(255, 255, 255, .94);--panel-solid: #ffffff;--line: rgba(23, 32, 53, .18);--muted: #495b76;--aqua: #1556b8;--shadow: rgba(28, 52, 91, .12)}:root[data-theme=light] body{background:linear-gradient(145deg,#edf3fc,#f8fbff 55%,#e5edfa)}.theme-switch{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:10px;background:var(--panel-solid);font-size:.875rem;cursor:pointer}:root[data-theme=light] .language-switch select,:root[data-theme=light] .first-player{color:#172035}:root[data-theme=light] .segmented-control,:root[data-theme=light] .difficulty-list,:root[data-theme=light] .score-card{background:#edf2fa}:root[data-theme=light] .segmented-control button.active,:root[data-theme=light] .difficulty-list button.active{color:#fff;background:#264f91}:root[data-theme=light] .result-banner button{color:#172035}:root[data-theme=light] .error-banner{color:#931c32;background:#fff0f3;border-color:#cc6a7c}:root[data-theme=light] .error-banner button{color:#931c32;background:#f8d7df}:root[data-theme=light] .turn-chip,:root[data-theme=light] .mini-piece,:root[data-theme=light] .brand-mark i{box-shadow:0 0 0 1px 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