:root {
    --page-bg: linear-gradient(135deg, #333 10%, #f9aeae 45%, #FFFFB9 100%);
    --card-bg: rgba(255, 255, 255, 0.88);
    --ink: #1e2430;
    --muted: #64748b;
    --accent: #E22726;
    --accent-dark: #C4201F;
    --line: rgba(30, 36, 48, 0.12);
}

body {
    min-height: 100vh;
    background: var(--page-bg);
    color: var(--ink);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.page-shell,
.admin-body {
    min-height: 100vh;
}

.hero-card,
.leaderboard-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 28px;
    padding: 1.5rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.16rem;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent-dark);
}

.reference-panel,
.status-panel {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 1rem;
}

.status-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.label {
    display: block;
    font-size: 0.82rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

.timer-display {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 700;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
}

.puzzle-board {
    --grid-size: 3;
    width: min(100%, 480px);
    aspect-ratio: 1 / 1;
    display: grid;
    grid-template-columns: repeat(var(--grid-size), 1fr);
    gap: 6px;
    padding: 8px;
    border-radius: 26px;
    background: rgba(30, 36, 48, 0.08);
    touch-action: none;
    user-select: none;
}

.puzzle-tile,
.puzzle-empty {
    border-radius: 18px;
    overflow: hidden;
    border: 0;
    position: relative;
}

.puzzle-tile {
    background-size: calc(var(--grid-size) * 100%) calc(var(--grid-size) * 100%);
    box-shadow: 0 10px 20px rgba(30, 36, 48, 0.18);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.puzzle-tile:active,
.puzzle-tile:hover {
    transform: scale(0.98);
    box-shadow: 0 5px 10px rgba(30, 36, 48, 0.14);
}

.puzzle-empty {
    background:
        linear-gradient(135deg, rgba(201, 109, 66, 0.1), rgba(201, 109, 66, 0.18)),
        repeating-linear-gradient(
            45deg,
            rgba(201, 109, 66, 0.08),
            rgba(201, 109, 66, 0.08) 12px,
            rgba(255, 255, 255, 0.3) 12px,
            rgba(255, 255, 255, 0.3) 24px
        );
    border: 2px dashed rgba(201, 109, 66, 0.4);
}

.legend {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--muted);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background: var(--accent);
}

.table th {
    color: var(--muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.04rem;
}

@media (max-width: 767.98px) {
    .hero-card,
    .leaderboard-card {
        padding: 1.1rem;
        border-radius: 22px;
    }

    .status-panel {
        align-items: stretch;
        flex-direction: column;
    }

    .puzzle-board {
        width: 100%;
    }
}