:root {
    --bg: #0b0d12;
    --bg-elevated: #12161d;
    --surface: #161b22;
    --surface-strong: #1d242d;
    --surface-soft: #11161d;
    --border: #27303a;
    --border-strong: #37424f;
    --text: #edf1f5;
    --muted: #98a2ad;
    --accent: #d2b062;
    --accent-soft: rgba(210, 176, 98, 0.12);
    --success: #79c08f;
    --danger: #e37979;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.38);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.5rem;
    --spacing-6: 2rem;
}

html,
body {
    min-height: 100%;
}

body.tetris-body {
    margin: 0;
    background-color: var(--bg);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: -0.01em;
}

::selection {
    background: rgba(210, 176, 98, 0.24);
}

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

.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(14px);
    background: rgba(11, 13, 18, 0.92);
}

.eyebrow,
.panel-label {
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
}

.app-title {
    font-size: clamp(1.4rem, 2vw, 1.9rem);
    font-weight: 700;
    color: var(--text);
}

.status-badge {
    border: 1px solid var(--border);
    background: var(--surface-strong) !important;
    color: var(--text);
    padding: 0.55rem 0.75rem;
    font-weight: 600;
}

.control-btn {
    min-width: 92px;
}

.status-badge.state-ready {
    background: rgba(39, 48, 58, 0.9) !important;
}

.status-badge.state-playing {
    background: rgba(210, 176, 98, 0.16) !important;
    color: #f3e6c8;
    border-color: rgba(210, 176, 98, 0.5);
}

.status-badge.state-paused {
    background: rgba(122, 141, 182, 0.16) !important;
    color: #d3deef;
    border-color: rgba(122, 141, 182, 0.4);
}

.status-badge.state-game-over {
    background: rgba(203, 125, 125, 0.16) !important;
    color: #f3d6d6;
    border-color: rgba(203, 125, 125, 0.4);
}

.panel {
    background: rgba(18, 22, 29, 0.96);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-5);
}

.compact-panel {
    padding: 1.1rem;
}

.panel-header {
    margin-bottom: 1rem;
}

.panel-title {
    font-size: 1.05rem;
    font-weight: 650;
    margin: 0;
}

.panel-inline-stats {
    color: var(--muted);
}

.inline-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(17, 22, 29, 0.72);
    font-size: 0.85rem;
}

.board-layout {
    display: grid;
    gap: 1rem;
}

.board-frame {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-strong);
    background: #0e1218;
}

#tetris-board {
    display: block;
    width: auto;
    max-width: 100%;
    height: min(60vh, 560px);
    aspect-ratio: 1 / 2;
    margin-inline: auto;
    background: transparent;
}

.board-overlay {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 1.5rem;
    text-align: center;
    background: rgba(11, 13, 18, 0.82);
    color: var(--text);
    transition: opacity 180ms ease, visibility 180ms ease;
}

.board-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.overlay-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--accent);
}

.overlay-title {
    font-size: clamp(1.4rem, 4vw, 2.1rem);
    font-weight: 700;
}

.overlay-copy {
    color: var(--muted);
    max-width: 34rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem;
}

.stat-card,
.history-detail,
.preview-wrap {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: rgba(14, 18, 24, 0.92);
}

.stat-card {
    padding: 1rem;
}

.stat-label,
.summary-label,
.history-detail-header,
.detail-grid dt {
    display: block;
    color: var(--muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.stat-value {
    display: block;
    margin-top: 0.25rem;
    font-size: clamp(1.2rem, 2vw, 1.55rem);
    font-weight: 700;
}

.preview-wrap {
    padding: 0.75rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 176px;
}

#next-piece {
    width: 144px;
    height: 144px;
}

.multiplayer-block .form-control {
    background: var(--surface-soft);
    border-color: var(--border);
    color: var(--text);
}

.multiplayer-block .form-control:focus {
    background: var(--surface-soft);
    border-color: var(--accent);
    box-shadow: 0 0 0 0.2rem rgba(210, 176, 98, 0.15);
}

.room-code-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.75rem 0.9rem;
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-md);
    background: rgba(14, 18, 24, 0.6);
}

.room-code-label {
    display: block;
    color: var(--muted);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
}

.room-code-value {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.2em;
}

.room-status .status-badge {
    font-size: 0.75rem;
}

.opponent-wrap {
    display: grid;
    gap: 0.75rem;
}

#opponent-board {
    width: 100%;
    max-width: 240px;
    height: auto;
    margin: 0 auto;
    aspect-ratio: 1 / 2;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: #0e1218;
}

.opponent-name {
    font-weight: 600;
}

.detail-grid {
    display: grid;
    gap: 0.9rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.detail-grid.compact {
    gap: 0.75rem;
}

.detail-grid .full {
    grid-column: 1 / -1;
}

.detail-grid dd {
    margin: 0.28rem 0 0;
    font-size: 1rem;
    font-weight: 600;
}

.controls-list {
    display: grid;
    gap: 0.7rem;
}

.controls-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    color: var(--text);
    font-size: 0.92rem;
    padding-bottom: 0.65rem;
    border-bottom: 1px solid rgba(39, 48, 58, 0.7);
}

.controls-list li:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    padding: 0.28rem 0.5rem;
    margin-left: 0.35rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: var(--surface-soft);
    color: var(--text);
    font-size: 0.78rem;
    font-family: inherit;
    box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.04);
}

.empty-state {
    padding: 0.95rem 1rem;
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-md);
    color: var(--muted);
    background: rgba(14, 18, 24, 0.5);
    font-size: 0.92rem;
}

.history-list {
    display: grid;
    gap: 0.75rem;
}

.history-item {
    width: 100%;
    text-align: left;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: rgba(14, 18, 24, 0.88);
    padding: 0.9rem 1rem;
    color: var(--text);
    transition: border-color 140ms ease, transform 140ms ease, background-color 140ms ease;
}

.history-item:hover,
.history-item:focus-visible {
    border-color: var(--accent);
    background: rgba(17, 22, 29, 1);
    transform: translateY(-1px);
    outline: none;
}

.history-item.active {
    border-color: var(--accent);
    background: rgba(210, 176, 98, 0.08);
}

.history-topline,
.history-subline {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
}

.history-score {
    font-weight: 700;
}

.history-meta,
.history-date {
    color: var(--muted);
    font-size: 0.82rem;
}

.history-detail {
    margin-top: 0.85rem;
    padding: 0.95rem 1rem;
}

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

.summary-grid strong {
    display: block;
    margin-top: 0.25rem;
    font-size: 1.3rem;
}

.modal-copy,
.toast-body,
.text-secondary {
    color: var(--muted) !important;
}

.btn-light {
    background: #f5f7f8;
    border-color: #f5f7f8;
}

.btn-outline-light {
    border-color: var(--border-strong);
    color: var(--text);
}

.btn-outline-light:hover,
.btn-outline-light:focus-visible {
    background: var(--surface-strong);
    border-color: var(--accent);
    color: var(--text);
}

.btn:focus-visible,
.history-item:focus-visible {
    box-shadow: 0 0 0 0.2rem rgba(210, 176, 98, 0.18);
}

.toast,
.modal-content {
    border-radius: var(--radius-md);
}

@media (max-width: 991.98px) {
    .app-header {
        position: static;
    }

    .panel {
        padding: 1rem;
    }
}

@media (max-width: 575.98px) {
    #tetris-board {
        height: min(52vh, 460px);
    }

    .stats-grid,
    .detail-grid,
    .summary-grid {
        grid-template-columns: 1fr 1fr;
    }

    .controls-list li {
        align-items: flex-start;
        flex-direction: column;
    }

    .history-topline,
    .history-subline {
        flex-direction: column;
        gap: 0.2rem;
    }
}


.field-help {
    color: var(--bs-secondary-color);
    font-size: 0.78rem;
    line-height: 1.4;
}

.scoreboard-list {
    display: grid;
    gap: 0.75rem;
}

.scoreboard-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.875rem;
    align-items: start;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.03);
}

.scoreboard-rank {
    min-width: 2.75rem;
    padding: 0.35rem 0.55rem;
    border-radius: 999px;
    background: rgba(210, 176, 98, 0.14);
    color: #d2b062;
    font-size: 0.82rem;
    font-weight: 700;
    text-align: center;
}

.scoreboard-item-body {
    min-width: 0;
}

.scoreboard-topline {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 0.3rem;
}

.scoreboard-name,
.scoreboard-score {
    color: #f8f9fa;
}

.scoreboard-score {
    white-space: nowrap;
    font-weight: 700;
}

.scoreboard-meta {
    color: var(--bs-secondary-color);
    font-size: 0.82rem;
    line-height: 1.45;
}

@media (max-width: 575.98px) {
    .scoreboard-item {
        grid-template-columns: 1fr;
    }

    .scoreboard-topline {
        flex-direction: column;
        align-items: flex-start;
    }
}