:root {
    --bg-color: #c0c0c0;
    --text-color: #000;
    --cell-bg: #c0c0c0;
    --cell-border-light: #fff;
    --cell-border-dark: #808080;
    --revealed-bg: #c0c0c0;
    --accent-color: #008000;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;

    --zoom-cell-size: 40px;
    --zoom-font-size: 24px;
    --zoom-shadow-color: rgba(0,0,0,0.5);
}

body {
    margin: 0;
    padding: 20px;
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
header {
    width: 100%;
    max-width: 800px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--cell-border-dark);
}

.back-btn {
    text-decoration: none;
    font-weight: bold;
    color: var(--text-color);
    padding: 5px 10px;
    border: 2px solid var(--cell-border-dark);
    border-top-color: var(--cell-border-light);
    border-left-color: var(--cell-border-light);
    background: var(--cell-bg);
}

.back-btn:active {
    border: 2px solid var(--cell-border-dark);
    border-bottom-color: var(--cell-border-light);
    border-right-color: var(--cell-border-light);
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    text-transform: uppercase;
}

/* HUD */
.hud {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    font-size: 1.2rem;
    font-weight: bold;
    background: #000;
    color: #f00;
    padding: 10px 20px;
    border: 2px inset var(--cell-border-dark);
    font-family: 'Courier New', Courier, monospace;
}

.hud div {
    min-width: 80px;
    text-align: center;
}

/* Game Board */
#game-container {
    padding: 10px;
    background: var(--cell-bg);
    border: 3px solid var(--cell-border-light);
    border-right-color: var(--cell-border-dark);
    border-bottom-color: var(--cell-border-dark);
    display: inline-block;
    max-width: 100%;
    overflow: auto;
}

#game-board {
    display: grid;
    gap: 0;
    user-select: none;
}

.cell {
    width: 25px;
    height: 25px;
    background-color: var(--cell-bg);
    border: 2px solid var(--cell-border-light);
    border-right-color: var(--cell-border-dark);
    border-bottom-color: var(--cell-border-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 16px;
    cursor: pointer;
    box-sizing: border-box;
}

.cell:active {
    border: 1px solid var(--cell-border-dark);
}

.cell.revealed {
    border: 1px solid #808080;
    background-color: var(--revealed-bg);
    border-color: #999;
}

.cell.mine {
    background-color: #f00;
}

.cell.flagged {
    color: #f00;
}

.cell.powerup {
    background-color: #ffcc00;
}

/* Numbers */
.cell.n1 { color: #0000ff; }
.cell.n2 { color: #008000; }
.cell.n3 { color: #ff0000; }
.cell.n4 { color: #000080; }
.cell.n5 { color: #800000; }
.cell.n6 { color: #008080; }
.cell.n7 { color: #000000; }
.cell.n8 { color: #808080; }

/* Controls */
.controls {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
    width: 100%;
    max-width: 600px;
}

.settings-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

select, button, input {
    padding: 8px 12px;
    font-size: 1rem;
    border: 2px solid var(--cell-border-dark);
    border-top-color: var(--cell-border-light);
    border-left-color: var(--cell-border-light);
    background: var(--cell-bg);
    color: var(--text-color);
    cursor: pointer;
}

button:active {
    border-color: var(--cell-border-dark);
    border-bottom-color: var(--cell-border-light);
    border-right-color: var(--cell-border-light);
    transform: translateY(1px);
}

#custom-settings {
    display: none;
    gap: 10px;
    margin-top: 10px;
    align-items: center;
    background: rgba(0,0,0,0.1);
    padding: 10px;
    border-radius: 4px;
}

#custom-settings input {
    width: 60px;
}

#message {
    height: 30px;
    margin-top: 10px;
    font-weight: bold;
    font-size: 1.2rem;
}

#high-score {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Themes */
body.theme-classic {
    /* Variables already set to classic by default */
}

body.theme-dark {
    --bg-color: #222;
    --text-color: #eee;
    --cell-bg: #444;
    --cell-border-light: #666;
    --cell-border-dark: #111;
    --revealed-bg: #333;
    --accent-color: #0f0;
}
body.theme-dark .hud { background: #111; color: #0f0; border: 2px solid #555; }
body.theme-dark .cell.revealed { border-color: #222; }

body.theme-neon {
    --bg-color: #050510;
    --text-color: #0ff;
    --cell-bg: #1a1a2e;
    --cell-border-light: #ff00ff;
    --cell-border-dark: #00ffff;
    --revealed-bg: #0f0f1e;
    --accent-color: #ff00ff;
    font-family: 'Orbitron', monospace;
}
body.theme-neon header { border-bottom-color: #ff00ff; }
body.theme-neon .back-btn { border-color: #00ffff; color: #ff00ff; background: transparent; }
body.theme-neon .hud {
    background: transparent;
    color: #ff00ff;
    border: 1px solid #00ffff;
    box-shadow: 0 0 10px #ff00ff;
    text-shadow: 0 0 5px #ff00ff;
}
body.theme-neon #game-container {
    border: 2px solid #00ffff;
    box-shadow: 0 0 15px #00ffff;
    background: transparent;
}
body.theme-neon .cell {
    border: 1px solid rgba(0, 255, 255, 0.3);
    background: rgba(255, 0, 255, 0.05);
    color: #fff;
}
body.theme-neon .cell:hover {
    background: rgba(0, 255, 255, 0.2);
}
body.theme-neon .cell.revealed {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 0, 255, 0.1);
    box-shadow: inset 0 0 5px #000;
}
body.theme-neon .cell.mine { background: #ff0000; box-shadow: 0 0 10px #f00; }
body.theme-neon .cell.n1 { color: #0ff; text-shadow: 0 0 5px #0ff; }
body.theme-neon .cell.n2 { color: #0f0; text-shadow: 0 0 5px #0f0; }
body.theme-neon .cell.n3 { color: #f00; text-shadow: 0 0 5px #f00; }
body.theme-neon select, body.theme-neon button, body.theme-neon input {
    background: #050510;
    border: 1px solid #0ff;
    color: #0ff;
    box-shadow: 0 0 5px #0ff;
}
body.theme-neon .cell.flagged { text-shadow: 0 0 8px #f00; }

/* Animations */
@keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    10% { transform: translate(-1px, -2px) rotate(-1deg); }
    20% { transform: translate(-3px, 0px) rotate(1deg); }
    30% { transform: translate(3px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 2px) rotate(-1deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(3px, 1px) rotate(-1deg); }
    80% { transform: translate(-1px, -1px) rotate(1deg); }
    90% { transform: translate(1px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.shake {
    animation: shake 0.5s;
    animation-iteration-count: 1;
}

/* Mobile */
@media (max-width: 600px) {
    .cell { width: 20px; height: 20px; font-size: 12px; }
    h1 { font-size: 1.2rem; }
    .hud { padding: 5px 10px; font-size: 1rem; }
    .controls { width: 100%; }
    .settings-row { flex-direction: column; width: 100%; align-items: center; }
    select, button { width: 100%; max-width: 250px; }
}

/* Mini Zoom */
#mini-zoom {
    display: none;
    position: fixed;
    z-index: 1000;
    pointer-events: none;
    background: var(--bg-color);
    border: 3px solid var(--accent-color);
    box-shadow: 0 0 15px var(--zoom-shadow-color);
    padding: 2px;
    border-radius: 4px;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
}

#mini-zoom .cell {
    width: var(--zoom-cell-size);
    height: var(--zoom-cell-size);
    font-size: var(--zoom-font-size);
}