:root {
    --bg: #050a14;
    --surface: rgba(255, 255, 255, 0.04);
    --border: rgba(100, 160, 255, 0.12);
    --accent: #4d9fff;
    --accent-glow: rgba(77, 159, 255, 0.4);
    --text: #e2eaf8;
    --text-dim: rgba(226, 234, 248, 0.4);
    
    --cell-bg: rgba(255, 255, 255, 0.08);
    --cell-border-tl: rgba(255, 255, 255, 0.2);
    --cell-border-br: rgba(0, 0, 0, 0.5);
    
    --cell-open-bg: rgba(5, 10, 20, 0.6);
    --cell-open-border: rgba(255, 255, 255, 0.05);

    /* Text Colors for Numbers 1-8 */
    --c1: #4d9fff; /* Blue */
    --c2: #4ade80; /* Green */
    --c3: #f87171; /* Red */
    --c4: #a855f7; /* Purple */
    --c5: #fbbf24; /* Yellow */
    --c6: #2dd4bf; /* Teal */
    --c7: #f472b6; /* Pink */
    --c8: #9ca3af; /* Gray */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* ── Background ── */
.bg-animation {
    position: fixed;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(circle at 70% 30%, rgba(77, 159, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 30% 70%, rgba(168, 85, 247, 0.05) 0%, transparent 50%);
    animation: pulse 10s ease-in-out infinite alternate;
}
@keyframes pulse {
    0%   { opacity: 0.7; }
    100% { opacity: 1; }
}

.back-btn {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 100;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    font-weight: 600;
    transition: color 0.3s;
}
.back-btn:hover { color: var(--accent); }

/* ── Layout ── */
.game-wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    padding: 1rem;
}

.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.main-panel {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
}

/* ── Header Bar ── */
.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.4);
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--cell-open-border);
}

.counter-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: #000;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    border: inset 2px #333;
}

.icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 0 4px rgba(255,255,255,0.2));
}

.lcd-text {
    font-family: 'JetBrains Mono', monospace;
    color: #f87171;
    font-size: 1.5rem;
    text-shadow: 0 0 8px rgba(248, 113, 113, 0.6);
    line-height: 1;
    width: 3ch;
    text-align: right;
}

.smiley-btn {
    font-size: 1.8rem;
    background: var(--cell-bg);
    border-top: 2px solid var(--cell-border-tl);
    border-left: 2px solid var(--cell-border-tl);
    border-bottom: 2px solid var(--cell-border-br);
    border-right: 2px solid var(--cell-border-br);
    border-radius: 4px;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: filter 0.1s;
}
.smiley-btn:active {
    border: inset 2px var(--cell-border-br);
    background: var(--cell-open-bg);
}
.smiley-btn:hover {
    filter: brightness(1.2);
}

/* ── Board ── */
.board-container {
    background: #000;
    padding: 0.5rem;
    border-radius: 8px;
    border: inset 3px #333;
}

.grid {
    display: grid;
    gap: 1px;
    background: #444; /* gap color */
}

.cell {
    width: 2rem;
    height: 2rem;
    background: var(--cell-bg);
    border-top: 2px solid var(--cell-border-tl);
    border-left: 2px solid var(--cell-border-tl);
    border-bottom: 2px solid var(--cell-border-br);
    border-right: 2px solid var(--cell-border-br);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.2rem;
    cursor: pointer;
}

.cell.open {
    background: var(--cell-open-bg);
    border: 1px solid var(--cell-open-border);
    cursor: default;
}

.cell.flag {
    /* Flag icon managed via JS textContent */
}

.cell.mine {
    background: #f87171 !important;
    border-color: #f87171 !important;
}
.cell.mine.exploded {
    background: #dc2626 !important;
    box-shadow: 0 0 15px rgba(220, 38, 38, 0.8);
}
.cell.false-flag {
    background: #fca5a5;
}

/* Colors for numbers */
.val-1 { color: var(--c1); text-shadow: 0 0 6px var(--c1); }
.val-2 { color: var(--c2); text-shadow: 0 0 6px var(--c2); }
.val-3 { color: var(--c3); text-shadow: 0 0 6px var(--c3); }
.val-4 { color: var(--c4); text-shadow: 0 0 6px var(--c4); }
.val-5 { color: var(--c5); text-shadow: 0 0 6px var(--c5); }
.val-6 { color: var(--c6); text-shadow: 0 0 6px var(--c6); }
.val-7 { color: var(--c7); text-shadow: 0 0 6px var(--c7); }
.val-8 { color: var(--c8); text-shadow: 0 0 6px var(--c8); }

/* ── Side Panel ── */
.side-panel {
    display: flex;
    flex-direction: column;
    width: 200px;
}
.mt-4 { margin-top: 1rem; }

.controls-card, .dev-card {
    padding: 1.2rem 1rem;
}

.label {
    font-size: 0.6rem;
    letter-spacing: 0.25em;
    color: var(--text-dim);
    margin-bottom: 0.8rem;
    font-weight: 600;
    text-align: center;
}

.diff-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.diff-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.6rem;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.2s;
}
.diff-btn:hover {
    background: rgba(255,255,255,0.1);
}
.diff-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
}

.diff-info {
    text-align: center;
    margin-top: 0.8rem;
    font-size: 0.7rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
}

.controls-list {
    list-style: none;
}
.controls-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.6rem;
    font-size: 0.7rem;
    color: var(--text-dim);
}
.key {
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 6px;
    font-size: 0.65rem;
    color: var(--accent);
}

.dev-note {
    font-size: 0.65rem;
    color: var(--text-dim);
    line-height: 1.6;
}

/* ── Overlays ── */
.overlay {
    position: absolute;
    inset: 0;
    background: rgba(5, 10, 20, 0.85);
    backdrop-filter: blur(4px);
    border-radius: 16px;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s;
}
.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 2rem 3rem;
    border-radius: 16px;
    box-shadow: 0 0 40px rgba(0,0,0,0.5);
}

.overlay-title {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 0.2em;
    margin-bottom: 1rem;
    color: #fff;
}
.title-clear {
    color: var(--accent);
    text-shadow: 0 0 20px var(--accent-glow);
}
.title-over {
    color: #f87171;
    text-shadow: 0 0 20px rgba(248, 113, 113, 0.4);
}

.final-stats {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-dim);
    font-size: 1.2rem;
}