:root {
    --corner-panel: rgba(255, 255, 255, 0.94);
    --corner-ink: #14213d;
    --corner-muted: #64748b;
    --cell-size: clamp(18px, 3.8vw, 31px);
}

.game-container {
    max-width: 1400px;
}

.setup-screen,
.game-area {
    background: var(--corner-panel);
    border-radius: 18px;
    padding: 22px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.2);
}

.setup-card {
    display: grid;
    gap: 12px;
    max-width: 460px;
    margin: 0 auto 18px;
    text-align: left;
}

.setup-card label {
    font-weight: 700;
    color: var(--corner-ink);
}

.setup-card select {
    width: 100%;
    padding: 12px;
    border: 2px solid #d8dee9;
    border-radius: 10px;
    font-size: 1rem;
    background: #fff;
}

.setup-note {
    color: var(--corner-muted);
    line-height: 1.45;
    margin: 4px 0 0;
}

.corner-layout {
    display: grid;
    grid-template-columns: minmax(170px, 0.75fr) minmax(320px, 1.6fr) minmax(260px, 0.95fr);
    gap: 18px;
    align-items: start;
}

.score-panel,
.pieces-panel,
.board-panel {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 14px;
}

.player-score {
    display: grid;
    grid-template-columns: 18px 1fr;
    gap: 8px;
    align-items: center;
    padding: 10px;
    border-radius: 12px;
    margin-bottom: 9px;
    background: #fff;
    border: 2px solid transparent;
}

.player-score.active {
    border-color: #facc15;
    box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.22);
}

.player-score.passed {
    opacity: 0.62;
}

.score-swatch,
.legend-swatch {
    width: 18px;
    height: 18px;
    border-radius: 5px;
    border: 2px solid rgba(15, 23, 42, 0.22);
}

.score-name {
    font-weight: 800;
    color: var(--corner-ink);
}

.score-detail {
    grid-column: 2;
    color: var(--corner-muted);
    font-size: 0.9rem;
}

.board-shell {
    overflow: auto;
    padding: 8px;
    background: linear-gradient(135deg, #e0f2fe, #eef2ff);
    border-radius: 14px;
    border: 1px solid #cbd5e1;
}

.corner-board {
    display: grid;
    grid-template-columns: repeat(var(--board-size), var(--cell-size));
    grid-template-rows: repeat(var(--board-size), var(--cell-size));
    gap: 2px;
    width: max-content;
    margin: 0 auto;
    touch-action: manipulation;
}

.corner-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    border-radius: 5px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    cursor: pointer;
    transition: transform 0.08s ease, box-shadow 0.08s ease, background 0.08s ease;
}

.corner-cell:hover {
    transform: scale(1.04);
    z-index: 2;
}

.corner-cell.start-corner {
    box-shadow: inset 0 0 0 3px rgba(15, 23, 42, 0.16);
}

.corner-cell.occupied {
    border-color: rgba(15, 23, 42, 0.38);
}

.corner-cell.preview-valid {
    background: #86efac !important;
    border-color: #16a34a;
    box-shadow: inset 0 0 0 2px #15803d;
}

.corner-cell.preview-invalid {
    background: #fca5a5 !important;
    border-color: #dc2626;
    box-shadow: inset 0 0 0 2px #b91c1c;
}

.corner-cell.preview-anchor {
    outline: 3px solid #facc15;
    outline-offset: -3px;
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
    justify-content: center;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--corner-ink);
    font-weight: 700;
    font-size: 0.92rem;
}

.piece-toolbar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 12px;
}

.piece-toolbar button,
#start-game-btn,
#restart-btn,
#exit-game-btn,
#back-to-modes-from-setup {
    border: none;
    border-radius: 10px;
    padding: 10px 12px;
    font-weight: 800;
    cursor: pointer;
    background: #4f46e5;
    color: #fff;
}

.piece-toolbar .btn-secondary,
#exit-game-btn,
#back-to-modes-from-setup {
    background: #64748b;
}

.piece-toolbar button:disabled,
#pass-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.selected-piece-card {
    background: #fff;
    border-radius: 14px;
    border: 1px solid #e2e8f0;
    padding: 12px;
    margin-bottom: 12px;
    text-align: center;
}

.selected-piece-card h3,
.pieces-panel h3 {
    margin: 0 0 10px;
    color: var(--corner-ink);
}

.selected-piece-preview {
    min-height: 72px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#selected-piece-help {
    color: var(--corner-muted);
    margin: 8px 0 0;
    font-size: 0.9rem;
}

.piece-bank {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(74px, 1fr));
    gap: 10px;
    max-height: 430px;
    overflow: auto;
    padding-right: 4px;
}

.piece-tile {
    min-height: 76px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    background: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    color: var(--corner-ink);
}

.piece-tile.selected {
    border-color: #facc15;
    box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.32);
}

.piece-tile.used {
    opacity: 0.35;
    cursor: not-allowed;
}

.mini-piece {
    display: grid;
    gap: 2px;
}

.mini-cell {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    background: currentColor;
    border: 1px solid rgba(15, 23, 42, 0.22);
}

.piece-name {
    font-size: 0.78rem;
    font-weight: 800;
}

.status {
    min-height: 24px;
    margin-bottom: 14px;
    font-weight: 800;
    color: var(--corner-ink);
}

.status.good {
    color: #047857;
}

.status.warn {
    color: #b45309;
}

.status.game-over {
    color: #7c3aed;
}

.game-buttons {
    margin-top: 18px;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 980px) {
    .corner-layout {
        grid-template-columns: 1fr;
    }

    .score-panel {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 8px;
    }

    .player-score {
        margin-bottom: 0;
    }

    .piece-bank {
        max-height: 280px;
    }
}

@media (max-width: 560px) {
    .game-area,
    .setup-screen {
        padding: 14px;
    }

    .corner-layout {
        gap: 12px;
    }

    .score-panel,
    .pieces-panel,
    .board-panel {
        padding: 10px;
    }

    .piece-toolbar {
        grid-template-columns: 1fr;
    }

    .piece-bank {
        grid-template-columns: repeat(auto-fill, minmax(62px, 1fr));
    }
}