:root {
    --bg-color: #f4f1de; --text-color: #3d405b; --primary-accent: #e07a5f;
    --border-color: #3d405b; --shadow-color: #3d405b; --overlay-bg: #f4f1de;
    --game-bg: var(--bg-color); --food-color: var(--primary-accent);
    --snake-head-color: #3d405b; --snake-body-color: #81b29a;
}
body.dark-mode {
    --bg-color: #2c2f33; --text-color: #e6e6e6; --primary-accent: #f28c6e;
    --border-color: #e6e6e6; --shadow-color: #1a1c1e; --overlay-bg: #2c2f33;
    --game-bg: var(--bg-color); --food-color: var(--primary-accent);
    --snake-head-color: #e6e6e6; --snake-body-color: #8cc3a9;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'VT323', monospace; background-color: var(--bg-color); color: var(--text-color);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    min-height: 100vh; padding: 10px; overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}
.game-wrapper { display: flex; flex-direction: column; align-items: center; width: 100%; max-width: 540px; }
.header { width: 100%; display: flex; justify-content: space-between; font-size: 1.2rem; margin-bottom: 1rem; padding: 0 10px; }
#game-area {
    position: relative; border: 2px solid var(--border-color);
    box-shadow: 4px 4px 0px var(--shadow-color); border-radius: 8px; background-color: var(--game-bg);
}
#game-board { display: block; border-radius: 6px; }
.overlay {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0; display: flex; flex-direction: column;
    align-items: center; justify-content: center; text-align: center;
    background-color: var(--overlay-bg); border-radius: 6px; padding: 1rem;
}
.overlay h2 { font-size: 2.5rem; margin-bottom: 1.5rem; }
.overlay p { font-size: 1.2rem; margin-bottom: 1.5rem; }
.config-grid { display: flex; flex-direction: column; gap: 1rem; align-items: center; margin-bottom: 1rem; }
.config-grid p { font-size: 1.2rem; margin: 0; }
.config-grid .options { display: flex; gap: 1.5rem; font-size: 1rem; }
#countdown-text { font-size: 2rem; color: var(--primary-accent); transition: height 0.3s; }
.overlay button {
    font-family: 'VT323', monospace; font-size: 1.2rem; padding: 1rem 2rem; cursor: pointer;
    color: var(--text-color); background-color: var(--primary-accent); border: 2px solid var(--border-color);
    box-shadow: 4px 4px 0px var(--shadow-color); border-radius: 5px; transition: all 0.1s ease-in-out;
}
.overlay button:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0px var(--shadow-color); }
.hidden { display: none !important; }
.footer-nav {
    position: fixed; bottom: 10px; left: 10px; right: 10px; display: flex;
    justify-content: space-between; align-items: center; font-size: 0.8rem;
}
.back-btn { color: var(--text-color); text-decoration: none; padding: 0.5rem; font-size: 1rem; }
#theme-toggle {
    background: none; border: 2px solid var(--border-color); color: var(--text-color);
    font-family: 'VT323', monospace; cursor: pointer; padding: 0.5rem;
    border-radius: 5px; font-size: 1rem;
}
#mobile-controls { margin-top: 1rem; width: 180px; height: 120px; }
.d-pad { display: grid; grid-template-columns: 1fr 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 5px; width: 100%; height: 100%; }
.ctrl-btn {
    background-color: var(--primary-accent); border: 2px solid var(--border-color); color: var(--text-color);
    font-size: 1.5rem; border-radius: 8px; user-select: none; display: flex; align-items: center; justify-content: center;
}
#up-btn { grid-column: 2 / 3; grid-row: 1 / 2; }
#left-btn { grid-column: 1 / 2; grid-row: 2 / 3; }
#right-btn { grid-column: 3 / 4; grid-row: 2 / 3; }
#down-btn { grid-column: 2 / 3; grid-row: 2 / 3; }