:root {
    --bg: #05070a;
    --panel: #0e1421;
    --panel-2: #111b2f;
    --accent: #f7d046;
    --accent-2: #3fc5ff;
    --accent-3: #ff5c8a;
    --text: #eaf3ff;
    --muted: #9fb0c8;
    --card: #1b2942;
    --card-flip: #1f3a5c;
    --green: #53f2a8;
    --shadow: rgba(9, 14, 24, 0.75);
}

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

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top, #101a2b 0%, var(--bg) 60%);
    color: var(--text);
    font-family: "Courier New", "Lucida Console", monospace;
    letter-spacing: 0.02em;
    padding: 32px 16px;
}

.screen {
    position: relative;
    width: min(960px, 92vw);
    background: linear-gradient(145deg, #0b1220, #0b0f1a);
    border: 3px solid #2a3d5f;
    border-radius: 18px;
    padding: 32px;
    box-shadow: 0 24px 60px var(--shadow), inset 0 0 24px rgba(63, 197, 255, 0.12);
    overflow: hidden;
}

.hero {
    display: grid;
    gap: 12px;
    margin-bottom: 24px;
}

.back {
    color: var(--accent-2);
    text-decoration: none;
    font-size: 0.95rem;
    width: fit-content;
}

.badge {
    display: inline-flex;
    padding: 6px 12px;
    border-radius: 999px;
    background: #1a2740;
    color: var(--accent-2);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    width: fit-content;
}

h1 {
    font-size: clamp(28px, 4vw, 40px);
    color: var(--accent);
    text-transform: uppercase;
}

.subtitle {
    color: var(--muted);
    font-size: 15px;
}

.panel {
    background: var(--panel);
    border: 2px solid #1f2c47;
    border-radius: 16px;
    padding: 24px;
    display: grid;
    gap: 20px;
    box-shadow: inset 0 0 28px rgba(4, 8, 16, 0.8);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
}

.stats {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.stat {
    background: var(--panel-2);
    border: 1px solid #243756;
    padding: 10px 14px;
    border-radius: 12px;
    min-width: 110px;
    box-shadow: inset 0 0 12px rgba(12, 20, 32, 0.75);
}

.stat .label {
    display: block;
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.16em;
    margin-bottom: 6px;
}

.stat span:last-child {
    font-size: 18px;
    color: var(--accent-2);
}

.buttons {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.btn {
    border: 2px solid #2a3d5f;
    background: #162238;
    color: var(--text);
    padding: 10px 16px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 12px;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    border-color: var(--accent-2);
    box-shadow: 0 8px 16px rgba(18, 32, 60, 0.5);
}

.btn.primary {
    background: linear-gradient(135deg, #2d8cff, #2e5bff);
    border-color: #6aa3ff;
    color: #fff;
}

.btn.ghost {
    background: #141b2a;
    color: var(--accent-2);
}

.message {
    padding: 12px 16px;
    background: #121a2c;
    border-left: 3px solid var(--accent-3);
    color: var(--muted);
    font-size: 14px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.card {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--card);
    border: 2px solid #223453;
    border-radius: 12px;
    cursor: pointer;
    padding: 0;
    overflow: hidden;
    box-shadow: inset 0 0 16px rgba(5, 8, 14, 0.8);
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-2);
}

.card-face {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    font-size: clamp(22px, 3vw, 32px);
    font-weight: 700;
    transition: transform 0.35s ease, opacity 0.35s ease;
    backface-visibility: hidden;
}

.card-front {
    color: var(--accent-2);
    background: repeating-linear-gradient(45deg, #152236 0 8px, #1c2c47 8px 16px);
    text-shadow: 0 0 12px rgba(63, 197, 255, 0.5);
}

.card-back {
    color: var(--accent);
    background: var(--card-flip);
    text-shadow: 0 0 12px rgba(247, 208, 70, 0.4);
    transform: rotateY(180deg);
    opacity: 0;
}

.card.flipped .card-front {
    transform: rotateY(180deg);
    opacity: 0;
}

.card.flipped .card-back {
    transform: rotateY(0deg);
    opacity: 1;
}

.card.matched {
    border-color: var(--green);
    box-shadow: 0 0 18px rgba(83, 242, 168, 0.4);
}

.footer {
    margin-top: 20px;
    color: var(--muted);
    font-size: 12px;
}

.scanlines {
    pointer-events: none;
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0.04) 0,
        rgba(255, 255, 255, 0.04) 1px,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0) 4px
    );
    mix-blend-mode: screen;
    opacity: 0.4;
}

.glow {
    pointer-events: none;
    position: absolute;
    inset: 0;
    border-radius: 18px;
    box-shadow: inset 0 0 120px rgba(63, 197, 255, 0.15);
}

@media (max-width: 720px) {
    .screen {
        padding: 24px 18px;
    }

    .controls {
        flex-direction: column;
        align-items: flex-start;
    }

    .grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}