@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@600;700&display=swap');

:root {
    --bg-base: #0a0b10;
    --bg-surface: rgba(22, 24, 34, 0.82);
    --bg-surface-hover: rgba(35, 38, 54, 0.92);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --accent-primary: #8b5cf6;
    --accent-secondary: #06b6d4;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --board-background: rgba(8, 10, 16, 0.95);
    --cell-background: #141925;
    --cell-snake: #8b5cf6;
    --cell-head: #c4b5fd;
    --cell-food: #06b6d4;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.34);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: "Inter", system-ui, sans-serif;
    background:
        radial-gradient(circle at top, rgba(139, 92, 246, 0.18), transparent 32%),
        radial-gradient(circle at bottom right, rgba(6, 182, 212, 0.16), transparent 26%),
        var(--bg-base);
    color: var(--text-primary);
    line-height: 1.5;
    padding: 1rem;
}

body:focus {
    outline: none;
}

.app-shell {
    width: min(100%, 980px);
    margin: 0 auto;
}

.panel {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 1.25rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.eyebrow {
    margin: 0 0 0.4rem;
    color: var(--accent-secondary);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

h1,
h2 {
    font-family: "Outfit", sans-serif;
    letter-spacing: -0.02em;
}

h1 {
    margin: 0;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    max-width: 18ch;
}

h2 {
    margin: 0 0 0.8rem;
    font-size: 1rem;
}

.scoreboard {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.stat,
.card,
.toolbar,
.board-frame {
    background: rgba(9, 12, 18, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 18px;
}

.stat {
    min-width: 96px;
    padding: 0.8rem 1rem;
}

.stat strong {
    display: block;
    font-size: 1.4rem;
    margin-top: 0.15rem;
}

.stat-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1rem;
    margin-bottom: 1rem;
}

.status {
    margin: 0;
    color: var(--text-secondary);
}

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

button {
    border: 1px solid rgba(139, 92, 246, 0.28);
    background: rgba(139, 92, 246, 0.16);
    color: var(--text-primary);
    border-radius: 999px;
    padding: 0.72rem 1.15rem;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

button:hover:not(:disabled) {
    background: rgba(139, 92, 246, 0.24);
    border-color: rgba(139, 92, 246, 0.38);
}

button:active:not(:disabled) {
    transform: translateY(1px);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

button.secondary {
    background: rgba(6, 182, 212, 0.12);
    border-color: rgba(6, 182, 212, 0.28);
}

button.secondary:hover:not(:disabled) {
    background: rgba(6, 182, 212, 0.2);
    border-color: rgba(6, 182, 212, 0.36);
}

.game-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 1rem;
}

.board-frame {
    padding: 1rem;
}

.board {
    display: grid;
    gap: 0.2rem;
    width: min(100%, 34rem);
    aspect-ratio: 1;
    margin: 0 auto;
    background: var(--board-background);
    border-radius: 16px;
    padding: 0.5rem;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.cell {
    background: var(--cell-background);
    border-radius: 0.28rem;
}

.cell-snake {
    background: var(--cell-snake);
}

.cell-head {
    background: var(--cell-head);
}

.cell-food {
    background: var(--cell-food);
}

.sidebar {
    display: grid;
    gap: 1rem;
}

.card {
    padding: 1rem;
}

.card ul {
    margin: 0;
    padding-left: 1.1rem;
    color: var(--text-secondary);
}

.card li + li {
    margin-top: 0.35rem;
}

.touch-pad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.55rem;
    touch-action: manipulation;
}

.pad-button {
    min-height: 3rem;
    border-radius: 16px;
    padding: 0.75rem 0.5rem;
}

.pad-button.up {
    grid-column: 2;
}

.pad-button.left {
    grid-column: 1;
    grid-row: 2;
}

.pad-button.right {
    grid-column: 3;
    grid-row: 2;
}

.pad-button.down {
    grid-column: 2;
    grid-row: 3;
}

@media (max-width: 840px) {
    body {
        padding: 0.75rem;
    }

    .panel {
        padding: 1rem;
        border-radius: 20px;
    }

    .panel-header,
    .toolbar,
    .game-layout {
        grid-template-columns: 1fr;
        display: grid;
    }

    .scoreboard {
        justify-content: flex-start;
    }

    .toolbar {
        padding: 0.9rem;
    }

    .board {
        width: 100%;
    }
}

@media (max-width: 520px) {
    h1 {
        max-width: none;
    }

    .actions,
    .scoreboard {
        width: 100%;
    }

    .actions button,
    .scoreboard .stat {
        flex: 1 1 0;
    }
}