/* Student chess Omok-style shell. Loaded after chess.css and common-board-game-shell.css. */
body.chess-page.common-board-game-shell-page {
    --chess-card: var(--card-bg);
    --chess-card-soft: rgba(15, 23, 42, 0.52);
    --chess-line: var(--border);
    --chess-accent: var(--accent);
    --chess-accent-strong: var(--accent);
    --chess-mint: var(--success);
    --chess-danger: var(--danger);
    --chess-text: var(--text-main);
    --chess-sub: var(--text-sub);
    --chess-shadow: var(--common-board-card-shadow);
    --chess-radius-lg: var(--common-board-radius-lg);
    --chess-radius-md: var(--common-board-radius-md);
    color: var(--text-main);
}

body.chess-page.common-board-game-shell-page .chess-topbar {
    align-items: flex-start;
}

body.chess-page.common-board-game-shell-page .btn-icon {
    display: inline-grid;
    place-items: center;
    width: 44px;
    height: 44px;
    flex: 0 0 auto;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(15, 23, 42, 0.74);
    color: var(--text-main);
    font: inherit;
    font-size: 1.2rem;
    font-weight: 900;
    line-height: 1;
    cursor: pointer;
    box-shadow: var(--common-board-soft-shadow);
}

body.chess-page.common-board-game-shell-page .btn-icon:hover {
    border-color: color-mix(in srgb, var(--accent) 42%, var(--border));
    background: rgba(16, 185, 129, 0.14);
}

body.chess-page.common-board-game-shell-page .chess-runtime-status {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

body.chess-page.common-board-game-shell-page .chess-topbar-actions {
    flex: 0 0 auto;
}

body.chess-page.common-board-game-shell-page .chess-sfx-toggle.muted {
    color: rgba(148, 163, 184, 0.86);
    background: rgba(15, 23, 42, 0.42);
}

body.chess-page.common-board-game-shell-page .entry-state-card {
    margin: 0 0 18px;
    padding: 20px 22px;
    background:
        radial-gradient(circle at top right, rgba(129, 140, 248, 0.12), transparent 36%),
        rgba(15, 23, 42, 0.58);
}

body.chess-page.common-board-game-shell-page .hero-card.chess-card {
    margin-bottom: 18px;
}

body.chess-page.common-board-game-shell-page .hero-copy,
body.chess-page.common-board-game-shell-page .hero-side {
    border: 1px solid var(--border);
    border-radius: var(--common-board-radius-lg);
    box-shadow: var(--common-board-soft-shadow);
}

body.chess-page.common-board-game-shell-page .hero-copy {
    padding: 18px;
    background:
        radial-gradient(circle at top left, rgba(16, 185, 129, 0.18), transparent 42%),
        linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(15, 23, 42, 0.06)),
        var(--card-bg);
}

body.chess-page.common-board-game-shell-page .hero-side {
    padding: 18px;
    background:
        radial-gradient(circle at top right, rgba(129, 140, 248, 0.14), transparent 38%),
        linear-gradient(180deg, rgba(148, 163, 184, 0.08), transparent 72%),
        var(--card-bg);
}

body.chess-page.common-board-game-shell-page .hero-copy h2,
body.chess-page.common-board-game-shell-page .chess-side-title,
body.chess-page.common-board-game-shell-page .sidebar-card h3,
body.chess-page.common-board-game-shell-page .mode-block h3,
body.chess-page.common-board-game-shell-page .mode-block h4 {
    color: var(--text-main);
    letter-spacing: 0;
}

body.chess-page.common-board-game-shell-page .chess-profile-badge {
    border-color: rgba(251, 191, 36, 0.26);
    background: rgba(15, 23, 42, 0.46);
    color: #fbbf24;
}

body.chess-page.common-board-game-shell-page .kpi-box,
body.chess-page.common-board-game-shell-page .mode-block,
body.chess-page.common-board-game-shell-page .sidebar-card,
body.chess-page.common-board-game-shell-page .room-card,
body.chess-page.common-board-game-shell-page .record-item,
body.chess-page.common-board-game-shell-page .result-item,
body.chess-page.common-board-game-shell-page .leader-item,
body.chess-page.common-board-game-shell-page .move-row,
body.chess-page.common-board-game-shell-page .hero-action-card,
body.chess-page.common-board-game-shell-page .online-entry-panel,
body.chess-page.common-board-game-shell-page .chess-quick-status,
body.chess-page.common-board-game-shell-page .replay-toolbar,
body.chess-page.common-board-game-shell-page .move-cell {
    border-color: var(--border);
    background: rgba(15, 23, 42, 0.38);
    color: var(--text-main);
    box-shadow: none;
}

body.chess-page.common-board-game-shell-page .sidebar-card {
    padding: 18px;
}

body.chess-page.common-board-game-shell-page .public-room-block {
    margin-top: 0;
}

body.chess-page.common-board-game-shell-page .chess-ranking-sidebar-card {
    background:
        linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(59, 130, 246, 0.06) 42%, rgba(15, 23, 42, 0)),
        rgba(15, 23, 42, 0.58);
}

body.chess-page.common-board-game-shell-page .field-box label,
body.chess-page.common-board-game-shell-page .hero-side-label,
body.chess-page.common-board-game-shell-page .hero-copy p,
body.chess-page.common-board-game-shell-page .status-note,
body.chess-page.common-board-game-shell-page .chess-side-note,
body.chess-page.common-board-game-shell-page .sidebar-card p,
body.chess-page.common-board-game-shell-page .room-card-meta span,
body.chess-page.common-board-game-shell-page .record-meta,
body.chess-page.common-board-game-shell-page .leader-meta,
body.chess-page.common-board-game-shell-page .move-row .index,
body.chess-page.common-board-game-shell-page .result-box-copy span {
    color: var(--text-sub);
}

body.chess-page.common-board-game-shell-page .btn-chess.danger {
    border-color: rgba(239, 68, 68, 0.34);
    color: #fecaca;
}

body.chess-page.common-board-game-shell-page .btn-chess.danger:hover {
    border-color: rgba(239, 68, 68, 0.5);
    background: rgba(127, 29, 29, 0.32);
}

body.chess-page.common-board-game-shell-page .room-code-box,
body.chess-page.common-board-game-shell-page .invite-surface,
body.chess-page.common-board-game-shell-page .promotion-surface,
body.chess-page.common-board-game-shell-page .decision-surface {
    border-color: color-mix(in srgb, var(--accent) 22%, var(--border));
    background:
        radial-gradient(circle at top, color-mix(in srgb, var(--accent) 14%, transparent), transparent 36%),
        rgba(15, 23, 42, 0.9);
    color: var(--text-main);
    box-shadow: var(--common-board-card-shadow);
}

body.chess-page.common-board-game-shell-page .board-card,
body.chess-page.common-board-game-shell-page .battle-hud,
body.chess-page.common-board-game-shell-page .fullscreen-cta,
body.chess-page.common-board-game-shell-page .player-strip,
body.chess-page.common-board-game-shell-page .guide-panel,
body.chess-page.common-board-game-shell-page .result-box {
    border-color: var(--border);
    background: rgba(15, 23, 42, 0.52);
    color: var(--text-main);
    box-shadow: var(--common-board-soft-shadow);
}

body.chess-page.common-board-game-shell-page .player-strip.active {
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.12);
}

body.chess-page.common-board-game-shell-page .player-strip.pressure {
    border-color: rgba(245, 158, 11, 0.42);
    background: rgba(245, 158, 11, 0.12);
}

body.chess-page.common-board-game-shell-page .player-strip.critical {
    border-color: rgba(239, 68, 68, 0.46);
    background: rgba(127, 29, 29, 0.28);
}

body.chess-page.common-board-game-shell-page .clock-box {
    border-color: var(--border);
    background: rgba(2, 6, 23, 0.42);
    color: var(--text-main);
}

body.chess-page.common-board-game-shell-page .turn-pill.tone-idle {
    border-color: var(--border);
    background: rgba(15, 23, 42, 0.42);
    color: var(--text-main);
}

body.chess-page.common-board-game-shell-page .turn-pill.tone-my-turn {
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.16);
    color: #86efac;
}

body.chess-page.common-board-game-shell-page .turn-pill.tone-enemy-turn {
    border-color: rgba(96, 165, 250, 0.38);
    background: rgba(37, 99, 235, 0.16);
    color: #bfdbfe;
}

body.chess-page.common-board-game-shell-page .turn-pill.tone-check,
body.chess-page.common-board-game-shell-page .turn-pill.tone-ended {
    border-color: rgba(251, 191, 36, 0.38);
    background: rgba(245, 158, 11, 0.16);
    color: #fde68a;
}

body.chess-page.common-board-game-shell-page .piece-image,
body.chess-page.common-board-game-shell-page .promotion-piece {
    width: 84%;
    max-width: none;
    height: 84%;
    object-fit: contain;
}

body.chess-page.common-board-game-shell-page .piece-image.piece-pawn,
body.chess-page.common-board-game-shell-page .board-flying-piece.piece-pawn {
    width: 72%;
    height: 72%;
}

body.chess-page.common-board-game-shell-page .board-frame {
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 24px 58px rgba(2, 6, 23, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.24);
}

body.chess-page.common-board-game-shell-page .board-stage {
    border-radius: 22px;
    overflow: hidden;
}

body.chess-page.common-board-game-shell-page .decision-modal,
body.chess-page.common-board-game-shell-page .promotion-modal,
body.chess-page.common-board-game-shell-page .chess-auth-overlay {
    background: rgba(2, 6, 23, 0.66);
    backdrop-filter: blur(10px);
}

@media (max-width: 720px) {
    body.chess-page.common-board-game-shell-page .chess-topbar {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
    }

    body.chess-page.common-board-game-shell-page .chess-topbar-actions {
        grid-column: 1 / -1;
        justify-content: flex-start;
        width: 100%;
    }

    body.chess-page.common-board-game-shell-page .quickstart-grid,
    body.chess-page.common-board-game-shell-page .field-grid,
    body.chess-page.common-board-game-shell-page .mode-panel-grid {
        grid-template-columns: 1fr;
    }
}