:root {
    --bg: #111;
    --fg: #eee;
    --canvas-bg: #1a1a1a;
    --grid-line: #222;
    --snake-head: #7fff7f;
    --snake-body: #3aa83a;
    --accent: #4a4;
    --muted-fg: #bbb;
    --dim-fg: #888;
    --panel-bg: #1a1a1a;
    --panel-border: #333;
    --btn-bg: #2a2a2a;
    --btn-hover-bg: #3a3a3a;
    --input-bg: #111;
    --input-border: #555;
    --food: #e23636;
    --bonus: #ffd700;
    --obstacle: #666;
    --overlay: rgba(0, 0, 0, 0.72);
    --overlay-fg: #fff;
}

body.light {
    --bg: #f5f5f5;
    --fg: #222;
    --canvas-bg: #fafafa;
    --grid-line: #d8d8d8;
    --snake-head: #2a7f2a;
    --snake-body: #4caf50;
    --accent: #2a7f2a;
    --muted-fg: #555;
    --dim-fg: #888;
    --panel-bg: #ffffff;
    --panel-border: #ccc;
    --btn-bg: #e8e8e8;
    --btn-hover-bg: #d8d8d8;
    --input-bg: #ffffff;
    --input-border: #aaa;
    --food: #c92121;
    --bonus: #d4a300;
    --obstacle: #888;
    --overlay: rgba(255, 255, 255, 0.78);
    --overlay-fg: #111;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100vh;
    height: 100svh;
    overflow: hidden;
}

body {
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, sans-serif;
    height: 100svh;
    padding-top: env(safe-area-inset-top);
    padding-bottom: calc(72px + env(safe-area-inset-bottom));
    overscroll-behavior: contain;
}

main {
    height: 100%;
    max-width: 400px;
    margin: 0 auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
}

.hidden {
    display: none !important;
}

#play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.5);
    color: var(--snake-head);
    border: 2px solid var(--snake-head);
    border-radius: 50%;
    width: 96px;
    height: 96px;
    font-size: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 5;
}

#play-overlay:hover {
    background: rgba(0, 0, 0, 0.7);
}

#play-overlay:focus-visible {
    outline: 2px solid var(--snake-head);
    outline-offset: 2px;
}

#game {
    border: 2px solid var(--accent);
    background: var(--canvas-bg);
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    aspect-ratio: 1 / 1;
    min-width: 0;
    min-height: 0;
    flex: 0 1 auto;
    touch-action: none;
}

#score-row {
    text-align: center;
    font-size: 26px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--fg);
    flex: 0 0 auto;
}

#best {
    color: var(--snake-head);
}

.sep {
    color: var(--dim-fg);
    margin: 0 10px;
}

#bottom-bar {
    position: fixed;
    left: 0;
    right: 0;
    display: flex;
    gap: 8px;
    padding: 8px;
    background: var(--panel-bg);
    z-index: 10;
    bottom: 0;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
    justify-content: space-between;
    border-top: 1px solid var(--panel-border);
}

#bottom-bar button {
    min-width: 48px;
    min-height: 48px;
    padding: 10px;
    font-size: 22px;
    background: var(--btn-bg);
    color: var(--fg);
    border: 1px solid var(--accent);
    border-radius: 6px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

#bottom-bar button:hover {
    background: var(--btn-hover-bg);
}

#bottom-bar button:focus-visible {
    outline: 2px solid var(--snake-head);
    outline-offset: 2px;
}

#mute[aria-pressed="true"] {
    color: var(--dim-fg);
    border-color: var(--input-border);
}

#name-modal {
    background: var(--panel-bg);
    color: var(--fg);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 24px 28px;
    font: inherit;
    min-width: 260px;
}

#name-modal::backdrop {
    background: rgba(0, 0, 0, 0.7);
}

#name-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 0;
}

#name-form p {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

#name-input {
    font: inherit;
    font-size: 16px;
    padding: 8px 10px;
    background: var(--input-bg);
    color: var(--fg);
    border: 1px solid var(--input-border);
    border-radius: 4px;
    outline: none;
}

#name-input:focus {
    border-color: var(--snake-head);
    box-shadow: 0 0 0 2px rgba(127, 255, 127, 0.3);
}

#name-save {
    font: inherit;
    font-size: 16px;
    padding: 8px 18px;
    background: var(--btn-bg);
    color: var(--fg);
    border: 1px solid var(--accent);
    border-radius: 4px;
    cursor: pointer;
    letter-spacing: 0.5px;
}

#name-save:hover:not(:disabled) {
    background: var(--btn-hover-bg);
}

#name-save:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#name-save:focus-visible {
    outline: 2px solid var(--snake-head);
    outline-offset: 2px;
}

#scoreboard-modal {
    background: var(--panel-bg);
    color: var(--fg);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 24px 28px;
    font: inherit;
    position: relative;
    min-width: 280px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
}

#scoreboard-modal::backdrop {
    background: rgba(0, 0, 0, 0.7);
}

.modal-close {
    position: absolute;
    top: 8px;
    right: 8px;
    background: transparent;
    border: none;
    color: var(--fg);
    font-size: 22px;
    cursor: pointer;
    padding: 4px;
}

.modal-close:focus-visible {
    outline: 2px solid var(--snake-head);
}

#scoreboard {
    box-sizing: border-box;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 12px 16px;
    color: var(--fg);
}

#scoreboard h2 {
    margin: 0 0 8px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--muted-fg);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

#scoreboard-list {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 15px;
    line-height: 1.6;
}

#scoreboard-list li {
    display: flex;
    align-items: baseline;
    padding: 2px 4px;
    gap: 8px;
}

#scoreboard-list li.current {
    color: var(--snake-head);
    font-weight: 600;
}

#scoreboard-list .sb-rank {
    width: 2em;
    color: var(--dim-fg);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

#scoreboard-list li.current .sb-rank {
    color: var(--snake-head);
}

#scoreboard-list .sb-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#scoreboard-list .sb-score {
    font-variant-numeric: tabular-nums;
}

#scoreboard-list li.empty {
    color: var(--dim-fg);
    font-style: italic;
    justify-content: center;
}

#history {
    box-sizing: border-box;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 12px 16px;
    color: var(--fg);
    margin-top: 12px;
}

#history h3 {
    margin: 0 0 6px 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--muted-fg);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

#history-list {
    font-size: 15px;
    font-variant-numeric: tabular-nums;
}

#history-list.empty {
    color: var(--dim-fg);
    font-style: italic;
}

#dpad {
    display: grid;
    grid-template-columns: repeat(3, 56px);
    grid-template-rows: repeat(3, 56px);
    gap: 6px;
    justify-content: center;
    margin: 12px auto 0;
    flex: 0 0 auto;
}

.dpad-up    { grid-column: 2; grid-row: 1; }
.dpad-left  { grid-column: 1; grid-row: 2; }
.dpad-play  { grid-column: 2; grid-row: 2; }
.dpad-down  { grid-column: 2; grid-row: 3; }
.dpad-right { grid-column: 3; grid-row: 2; }

.dpad-btn {
    background: var(--btn-bg);
    color: var(--fg);
    border: 1px solid var(--accent);
    border-radius: 8px;
    cursor: pointer;
    font-size: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.dpad-btn:active {
    background: var(--btn-hover-bg);
}

.dpad-btn:focus-visible {
    outline: 2px solid var(--snake-head);
    outline-offset: 2px;
}

@media (pointer: fine) and (hover: hover) {
    #dpad {
        display: none;
    }
    #play-dpad {
        display: none;
    }
}

@media (pointer: coarse) {
    #play-overlay {
        display: none;
    }
}

@media (max-width: 360px) {
    #bottom-bar button {
        min-width: 44px;
        min-height: 44px;
        font-size: 20px;
    }

    #score-row {
        font-size: 22px;
    }
}

@media (max-width: 380px) {
    #bottom-bar button {
        min-width: 40px;
        min-height: 40px;
        font-size: 18px;
        padding: 6px;
    }
}

@media (max-height: 700px) {
    #bottom-bar button {
        min-width: 40px;
        min-height: 40px;
        font-size: 18px;
        padding: 6px;
    }

    body {
        padding-bottom: calc(60px + env(safe-area-inset-bottom));
    }
}