/* ===== Minesweeper — Neon Edition Styles ===== */

:root {
    --bg-primary: #060614;
    --bg-card: rgba(15, 15, 35, 0.85);
    --text-primary: #e4e4f0;
    --text-dim: rgba(228, 228, 240, 0.5);
    --neon-green: #00ff88;
    --neon-blue: #00d4ff;
    --neon-pink: #ff2d75;
    --neon-purple: #b44dff;
    --neon-yellow: #ffe600;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(255, 45, 117, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 0%, rgba(180, 77, 255, 0.04) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

#app {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 700px;
    padding: 16px 20px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

/* Top Bar */
#top-bar {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#back-link {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: var(--neon-green);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

#back-link:hover {
    opacity: 1;
}

#mute-btn {
    background: none;
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: 8px;
    padding: 4px 10px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--neon-green);
    font-family: 'Orbitron', sans-serif;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.mute-label {
    font-size: 0.5rem;
    letter-spacing: 0.1em;
}

/* Header */
#header {
    text-align: center;
}

#title {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: clamp(1.4rem, 5vw, 2rem);
    letter-spacing: 0.1em;
    background: linear-gradient(135deg, var(--neon-green), var(--neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 18px rgba(0, 255, 136, 0.3));
}

#subtitle {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.55rem;
    letter-spacing: 0.4em;
    color: var(--text-dim);
    margin-top: 2px;
}

/* Difficulty Selector */
#diff-selector {
    display: flex;
    gap: 8px;
}

.diff-btn {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.5rem;
    letter-spacing: 0.08em;
    padding: 6px 14px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.4;
    text-align: center;
}

.diff-btn:hover {
    border-color: rgba(0, 255, 136, 0.2);
    color: var(--text-primary);
}

.diff-btn.active {
    border-color: var(--neon-green);
    color: var(--neon-green);
    background: rgba(0, 255, 136, 0.08);
}

.diff-detail {
    font-size: 0.4rem;
    opacity: 0.6;
    font-family: 'Inter', sans-serif;
}

/* HUD */
#hud {
    display: flex;
    gap: 24px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    padding: 10px 28px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.hud-item {
    text-align: center;
}

.hud-label {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.5rem;
    letter-spacing: 0.15em;
    color: var(--text-dim);
    display: block;
}

.hud-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--neon-green);
}

/* Board */
#board {
    display: inline-grid;
    gap: 2px;
    padding: 8px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    user-select: none;
    -webkit-user-select: none;
}

.cell {
    width: var(--cell-size, 32px);
    height: var(--cell-size, 32px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Orbitron', sans-serif;
    font-size: var(--cell-font, 0.7rem);
    font-weight: 700;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.04);
    color: transparent;
}

.cell:hover:not(.revealed):not(.flagged) {
    border-color: rgba(0, 255, 136, 0.3);
    background: rgba(0, 255, 136, 0.06);
}

.cell.revealed {
    background: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.03);
    cursor: default;
}

.cell.revealed.n1 {
    color: var(--neon-blue);
}

.cell.revealed.n2 {
    color: var(--neon-green);
}

.cell.revealed.n3 {
    color: var(--neon-pink);
}

.cell.revealed.n4 {
    color: var(--neon-purple);
}

.cell.revealed.n5 {
    color: #ff8800;
}

.cell.revealed.n6 {
    color: var(--neon-blue);
}

.cell.revealed.n7 {
    color: var(--neon-yellow);
}

.cell.revealed.n8 {
    color: #ffffff;
}

.cell.flagged {
    background: rgba(255, 45, 117, 0.1);
    border-color: rgba(255, 45, 117, 0.3);
    color: var(--neon-pink);
    font-size: 0.9rem;
}

.cell.mine-hit {
    background: rgba(255, 45, 117, 0.3) !important;
    border-color: var(--neon-pink) !important;
    color: var(--neon-pink) !important;
    animation: mine-flash 0.5s ease;
}

.cell.mine-reveal {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 45, 117, 0.2);
    color: var(--neon-pink);
    font-size: 0.9rem;
}

@keyframes mine-flash {

    0%,
    100% {
        box-shadow: 0 0 0 rgba(255, 45, 117, 0);
    }

    50% {
        box-shadow: 0 0 16px rgba(255, 45, 117, 0.5);
    }
}

/* Overlay */
#overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(6, 6, 20, 0.88);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(6px);
}

#overlay.hidden {
    display: none;
}

#overlay-content {
    text-align: center;
    padding: 32px 42px;
    border-radius: 18px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    max-width: 340px;
}

#overlay-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

#overlay-title {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 1.3rem;
    letter-spacing: 0.08em;
    margin-bottom: 10px;
    color: var(--neon-green);
}

#overlay-info {
    font-size: 0.75rem;
    line-height: 1.8;
    color: var(--text-dim);
    margin-bottom: 18px;
}

.key {
    display: inline-block;
    padding: 2px 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.55rem;
    color: var(--neon-blue);
    background: rgba(0, 212, 255, 0.06);
}

.neon-btn {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    padding: 12px 32px;
    border: 1px solid var(--neon-green);
    border-radius: 10px;
    background: rgba(0, 255, 136, 0.08);
    color: var(--neon-green);
    cursor: pointer;
    transition: var(--transition);
}

.neon-btn:hover {
    background: rgba(0, 255, 136, 0.18);
    box-shadow: 0 0 24px rgba(0, 255, 136, 0.2);
}

/* Controls Hint */
#controls-hint {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.45rem;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    text-align: center;
}

/* Footer */
#footer {
    text-align: center;
    font-size: 0.65rem;
    color: var(--text-dim);
    margin-top: 4px;
}

/* Responsive */
@media (max-width: 520px) {

    html,
    body {
        overflow: hidden;
        overscroll-behavior: none;
        position: fixed;
        width: 100%;
        height: 100%;
    }

    body {
        align-items: flex-start;
    }

    #app {
        padding: 6px 4px calc(8px + env(safe-area-inset-bottom, 20px));
        gap: 6px;
        height: 100%;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .cell.flagged,
    .cell.mine-reveal {
        font-size: var(--cell-font, 0.7rem);
    }

    #hud {
        padding: 6px 12px;
        gap: 10px;
    }

    .hud-value {
        font-size: 0.85rem;
    }

    .diff-btn {
        padding: 5px 8px;
        font-size: 0.4rem;
    }

    #footer {
        padding-bottom: env(safe-area-inset-bottom, 20px);
        font-size: 0.55rem;
    }
}