:root {
    --bg: #050816;
    --bg-elevated: #091022;
    --surface: rgba(8, 14, 28, 0.84);
    --surface-strong: rgba(11, 20, 40, 0.96);
    --surface-soft: rgba(7, 12, 22, 0.92);
    --border: rgba(72, 231, 255, 0.18);
    --border-strong: rgba(72, 231, 255, 0.42);
    --text: #ecfdff;
    --muted: #9bb6c8;
    --accent: #48e7ff;
    --accent-strong: #00ffc6;
    --accent-secondary: #ff4fd8;
    --accent-dark: #03131c;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow: 0 28px 80px rgba(0, 0, 0, 0.42);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    position: relative;
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at 18% 18%, rgba(72, 231, 255, 0.18), transparent 24%),
        radial-gradient(circle at 82% 14%, rgba(255, 79, 216, 0.16), transparent 24%),
        radial-gradient(circle at 50% 100%, rgba(0, 255, 198, 0.12), transparent 28%),
        linear-gradient(180deg, #08101f 0%, #040814 54%, #02050d 100%);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(rgba(72, 231, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(72, 231, 255, 0.06) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0.05));
    opacity: 0.28;
}

canvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.app-shell {
    min-height: 100vh;
}

.surface-panel {
    position: relative;
    background: linear-gradient(180deg, rgba(11, 20, 40, 0.88), rgba(6, 12, 24, 0.9));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow:
        var(--shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.04),
        0 0 0 1px rgba(72, 231, 255, 0.04),
        0 0 28px rgba(72, 231, 255, 0.08);
    backdrop-filter: blur(16px);
}

.surface-panel::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(72, 231, 255, 0.08), transparent 35%, rgba(255, 79, 216, 0.08));
    opacity: 0.9;
}

.surface-panel > * {
    position: relative;
    z-index: 1;
}

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

.eyebrow,
.section-label,
.brand-subtitle {
    margin: 0;
    color: var(--accent);
    font-size: 0.72rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
}

.app-title,
.display-title,
.brand-title {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    text-shadow: 0 0 18px rgba(72, 231, 255, 0.16);
}

.topbar-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.board-wrap {
    display: flex;
    justify-content: center;
}

.board-frame {
    position: relative;
    overflow: hidden;
    width: min(100%, 356px);
    border-radius: calc(var(--radius-lg) - 4px);
    border: 1px solid rgba(72, 231, 255, 0.28);
    background: linear-gradient(180deg, rgba(5, 10, 20, 0.98) 0%, rgba(2, 5, 12, 1) 100%);
    padding: 1rem;
    box-shadow:
        inset 0 0 0 1px rgba(255, 255, 255, 0.03),
        inset 0 0 28px rgba(72, 231, 255, 0.08),
        0 0 34px rgba(72, 231, 255, 0.16),
        0 0 60px rgba(255, 79, 216, 0.08);
}

.board-frame::before {
    content: "";
    position: absolute;
    inset: -20%;
    background:
        radial-gradient(circle at 20% 20%, rgba(72, 231, 255, 0.24), transparent 26%),
        radial-gradient(circle at 80% 10%, rgba(255, 79, 216, 0.22), transparent 24%),
        radial-gradient(circle at 50% 100%, rgba(0, 255, 198, 0.12), transparent 32%);
    filter: blur(26px);
    opacity: 0.95;
    pointer-events: none;
}

#tetris-board {
    position: relative;
    z-index: 1;
    display: block;
    width: 100%;
    height: auto;
    background: #040914;
    border-radius: 16px;
    border: 1px solid rgba(72, 231, 255, 0.16);
    box-shadow:
        inset 0 0 30px rgba(72, 231, 255, 0.08),
        inset 0 0 80px rgba(255, 79, 216, 0.04),
        0 0 16px rgba(72, 231, 255, 0.08);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
}

.stat-card,
.mini-panel,
.metric-card,
.surface-subpanel {
    background: linear-gradient(180deg, rgba(72, 231, 255, 0.08), rgba(255, 79, 216, 0.05));
    border: 1px solid rgba(72, 231, 255, 0.16);
    border-radius: var(--radius-md);
    padding: 0.95rem;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 0 18px rgba(72, 231, 255, 0.06);
}

.stat-label,
.mini-label,
.status-line,
.metric-label,
.small-link,
.text-secondary,
.detail-list {
    color: var(--muted) !important;
}

.stat-label,
.mini-label,
.status-line,
.metric-label {
    display: block;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.stat-value,
.metric-value,
.score-rank-pill {
    display: block;
    margin-top: 0.45rem;
    font-size: clamp(1.35rem, 2vw, 1.8rem);
    font-weight: 800;
    line-height: 1;
    color: var(--text);
    text-shadow: 0 0 14px rgba(72, 231, 255, 0.18);
}

.mini-panel canvas {
    display: block;
    width: 100%;
    height: auto;
    margin-top: 0.75rem;
    border-radius: 14px;
    border: 1px solid rgba(72, 231, 255, 0.16);
    background: #040914;
    box-shadow: inset 0 0 24px rgba(72, 231, 255, 0.05);
}

.panel-title,
.h5,
.h2 {
    color: var(--text);
}

.stack-gap > * + * {
    margin-top: 1rem;
}

.stack-gap-sm > * + * {
    margin-top: 0.75rem;
}

.form-control-dark {
    background: rgba(7, 16, 30, 0.92);
    color: var(--text);
    border: 1px solid rgba(72, 231, 255, 0.2);
    border-radius: 12px;
    min-height: 46px;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.form-control-dark::placeholder {
    color: #6e90a7;
}

.form-control-dark:focus {
    background: rgba(9, 20, 38, 0.98);
    color: var(--text);
    border-color: rgba(72, 231, 255, 0.52);
    box-shadow: 0 0 0 0.2rem rgba(72, 231, 255, 0.12);
}

.btn {
    border-radius: 12px;
    font-weight: 700;
    min-height: 46px;
    padding-inline: 1rem;
    transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.btn:hover,
.btn:focus-visible,
.control-btn:hover,
.control-btn:focus-visible,
.leaderboard-item:hover,
.small-link:hover {
    transform: translateY(-1px);
}

.btn-light {
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: var(--accent-dark);
    border: 0;
    box-shadow: 0 0 18px rgba(72, 231, 255, 0.28);
}

.btn-light:hover,
.btn-light:focus-visible {
    background: linear-gradient(135deg, #6cf0ff, #34ffd0);
    color: var(--accent-dark);
    box-shadow: 0 0 24px rgba(72, 231, 255, 0.36);
}

.btn-outline-light {
    color: var(--text);
    border-color: rgba(255, 79, 216, 0.35);
    background: rgba(255, 79, 216, 0.08);
    box-shadow: inset 0 0 0 1px rgba(255, 79, 216, 0.05);
}

.btn-outline-light:hover,
.btn-outline-light:focus-visible {
    color: var(--text);
    border-color: rgba(255, 79, 216, 0.52);
    background: rgba(255, 79, 216, 0.16);
    box-shadow: 0 0 22px rgba(255, 79, 216, 0.2);
}

.mobile-controls {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
}

.control-btn {
    border: 1px solid rgba(72, 231, 255, 0.2);
    background: linear-gradient(180deg, rgba(10, 20, 36, 0.95), rgba(6, 12, 22, 0.98));
    color: var(--text);
    border-radius: 14px;
    min-height: 52px;
    font-weight: 800;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03), 0 0 18px rgba(72, 231, 255, 0.08);
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.control-btn:hover,
.control-btn:focus-visible {
    background: linear-gradient(180deg, rgba(16, 28, 48, 0.98), rgba(8, 16, 28, 0.98));
    border-color: rgba(72, 231, 255, 0.44);
    box-shadow: 0 0 22px rgba(72, 231, 255, 0.16);
}

.control-btn.wide {
    grid-column: span 2;
}

.leaderboard-list {
    display: grid;
    gap: 0.65rem;
}

.leaderboard-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 0.75rem;
    padding: 0.8rem 0.9rem;
    border-radius: 14px;
    border: 1px solid rgba(72, 231, 255, 0.14);
    background: linear-gradient(180deg, rgba(11, 19, 34, 0.9), rgba(8, 14, 26, 0.92));
    color: var(--text);
    text-decoration: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

.leaderboard-item:hover,
.leaderboard-item.is-active {
    border-color: rgba(72, 231, 255, 0.36);
    box-shadow: 0 0 22px rgba(72, 231, 255, 0.12), inset 0 0 0 1px rgba(255, 79, 216, 0.12);
}

.leaderboard-rank {
    color: var(--accent);
    font-weight: 700;
}

.leaderboard-player {
    font-weight: 700;
}

.leaderboard-meta {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.status-line {
    min-height: 1.2rem;
}

.app-header {
    background: rgba(4, 8, 18, 0.78);
    backdrop-filter: blur(12px);
    border-color: rgba(72, 231, 255, 0.14) !important;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    border: 1px solid rgba(72, 231, 255, 0.28);
    background: linear-gradient(135deg, rgba(72, 231, 255, 0.18), rgba(255, 79, 216, 0.14));
    color: var(--text);
    font-weight: 800;
    letter-spacing: 0.08em;
    box-shadow: 0 0 18px rgba(72, 231, 255, 0.14);
}

.score-rank-pill {
    padding: 0.85rem 1rem;
    border-radius: 999px;
    border: 1px solid rgba(72, 231, 255, 0.24);
    background: linear-gradient(135deg, rgba(72, 231, 255, 0.12), rgba(255, 79, 216, 0.12));
    box-shadow: 0 0 20px rgba(72, 231, 255, 0.1);
}

.metric-value {
    margin-top: 0.4rem;
}

.detail-list {
    padding-left: 1.1rem;
}

.detail-list li + li {
    margin-top: 0.65rem;
}

.small-link {
    color: var(--accent);
}

.compact-list .leaderboard-item {
    padding-block: 0.72rem;
}

.alert.surface-panel {
    color: var(--text);
}

@media (max-width: 991.98px) {
    .app-topbar {
        flex-direction: column;
        align-items: stretch;
    }

    .topbar-actions {
        width: 100%;
    }

    .topbar-actions .btn {
        flex: 1 1 0;
    }
}

@media (max-width: 575.98px) {
    .board-frame {
        padding: 0.75rem;
    }

    .mobile-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .control-btn.wide {
        grid-column: span 1;
    }
}