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

:root {
    --bg: #080b14;
    --card: #121827;
    --text: #ffffff;
    --muted: #9ba4b6;
    --primary: #6c5ce7;
    --accent: #00d4ff;
    --red: #ff4757;
    --yellow: #ffd32a;
    --border: rgba(255,255,255,0.08);
}

body {
    min-height: 100vh;
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;

    background:
        radial-gradient(
            circle at top,
            rgba(108,92,231,0.18),
            transparent 40%
        ),
        var(--bg);

    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}


/* HEADER */

.header {
    height: 70px;
    position: sticky;
    top: 0;
    z-index: 20;

    background: rgba(8,11,20,0.92);
    border-bottom: 1px solid var(--border);

    backdrop-filter: blur(15px);
}

.header-inner {
    width: min(1000px, calc(100% - 30px));
    height: 100%;
    margin: auto;

    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 9px;

    font-size: 20px;
    font-weight: bold;
}

.logo span {
    width: 36px;
    height: 36px;

    display: grid;
    place-items: center;

    border-radius: 10px;

    background: linear-gradient(
        135deg,
        var(--primary),
        var(--accent)
    );
}

.logo strong {
    background: linear-gradient(
        90deg,
        #fff,
        #bdb9ff
    );

    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.back-btn {
    padding: 10px 15px;

    color: var(--muted);

    border: 1px solid var(--border);
    border-radius: 9px;

    font-size: 13px;
    font-weight: bold;
}

.back-btn:hover {
    color: white;
    background: rgba(255,255,255,0.06);
}


/* MAIN */

main {
    width: min(900px, calc(100% - 25px));
    margin: auto;

    padding: 55px 0 80px;
}


/* HEADING */

.heading {
    text-align: center;
    margin-bottom: 30px;
}

.label {
    margin-bottom: 10px;

    color: #9b93ff;

    font-size: 11px;
    font-weight: bold;

    letter-spacing: 1.5px;
}

.heading h1 {
    font-size: clamp(34px, 6vw, 50px);
    margin-bottom: 10px;
}

.heading p {
    color: var(--muted);
    font-size: 14px;
}


/* GAME CARD */

.game-card {
    width: 100%;

    padding: 18px;

    background: #111827;

    border: 1px solid var(--border);
    border-radius: 20px;

    box-shadow:
        0 25px 70px rgba(0,0,0,0.35);
}


/* STATS */

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);

    gap: 10px;

    margin-bottom: 15px;
}

.stat {
    padding: 10px;

    text-align: center;

    background: rgba(255,255,255,0.04);

    border: 1px solid var(--border);
    border-radius: 10px;
}

.stat span {
    display: block;

    color: var(--muted);

    font-size: 9px;
    font-weight: bold;

    letter-spacing: 1px;
}

.stat strong {
    display: block;

    margin-top: 4px;

    font-size: 21px;
}

.red-stat strong {
    color: var(--red);
}

.yellow-stat strong {
    color: var(--yellow);
}


/* STATUS */

.status {
    width: 100%;

    margin-bottom: 15px;
    padding: 12px;

    text-align: center;

    color: #ffffff;

    background: rgba(255,255,255,0.05);

    border: 1px solid var(--border);
    border-radius: 10px;

    font-size: 14px;
    font-weight: bold;
}


/* BOARD */

.board-wrapper {
    width: 100%;

    display: flex;
    justify-content: center;

    padding: 15px;

    border-radius: 18px;

    background:
        linear-gradient(
            145deg,
            #2148b7,
            #102d87
        );

    box-shadow:
        inset 0 0 25px rgba(0,0,0,0.3),
        0 15px 35px rgba(0,0,0,0.25);
}

.board {
    width: min(100%, 560px);

    display: grid;

    grid-template-columns:
        repeat(7, 1fr);

    gap: 9px;

    padding: 10px;

    border-radius: 12px;

    background: #1742ad;

    cursor: pointer;

    user-select: none;
}


/* CELL */

.cell {
    position: relative;

    width: 100%;
    aspect-ratio: 1;

    border-radius: 50%;

    background: #071a55;

    box-shadow:
        inset 0 5px 10px rgba(0,0,0,0.4);

    transition:
        transform 0.12s ease,
        background 0.12s ease;
}

.cell:hover {
    transform: scale(0.94);
}


/* RED */

.cell.red {
    background:
        radial-gradient(
            circle at 35% 30%,
            #ff8993,
            #ff4757 45%,
            #c91f31
        );

    box-shadow:
        0 4px 12px rgba(255,71,87,0.35),
        inset 0 3px 5px rgba(255,255,255,0.25);
}


/* YELLOW */

.cell.yellow {
    background:
        radial-gradient(
            circle at 35% 30%,
            #fff59b,
            #ffd32a 45%,
            #d9a900
        );

    box-shadow:
        0 4px 12px rgba(255,211,42,0.35),
        inset 0 3px 5px rgba(255,255,255,0.25);
}


/* WINNING CELLS */

.cell.winner {
    animation: winnerPulse 0.7s infinite alternate;
}

@keyframes winnerPulse {
    from {
        transform: scale(1);
    }

    to {
        transform: scale(1.1);
    }
}


/* BUTTON */

.restart-btn {
    display: block;

    margin: 20px auto 0;

    padding: 13px 25px;

    border: 0;
    border-radius: 11px;

    color: white;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            #5144d7
        );

    font-size: 14px;
    font-weight: bold;

    cursor: pointer;

    box-shadow:
        0 8px 20px rgba(108,92,231,0.3);

    transition: 0.15s;
}

.restart-btn:hover {
    transform: translateY(-2px);
}

.restart-btn:active {
    transform: translateY(1px);
}


/* CONTROLS */

.controls {
    display: flex;

    justify-content: center;
    flex-wrap: wrap;

    gap: 25px;

    margin-top: 15px;

    color: var(--muted);

    font-size: 11px;
}


/* INFO */

.info {
    max-width: 760px;

    margin: 60px auto 0;
}

.info h2 {
    margin-bottom: 12px;

    font-size: 23px;
}

.info p {
    margin-bottom: 30px;

    color: var(--muted);

    font-size: 14px;
    line-height: 1.8;
}

.info ul {
    padding-left: 20px;

    margin-bottom: 35px;

    color: var(--muted);

    font-size: 14px;
    line-height: 2;
}


/* FOOTER */

footer {
    padding: 25px 15px;

    text-align: center;

    color: #697284;

    background: #060810;

    border-top: 1px solid var(--border);

    font-size: 11px;
}


/* MOBILE */

@media (max-width: 600px) {

    .header {
        height: 62px;
    }

    .logo {
        font-size: 18px;
    }

    .logo span {
        width: 32px;
        height: 32px;
    }

    .back-btn {
        padding: 8px 10px;
        font-size: 11px;
    }

    main {
        padding-top: 40px;
    }

    .heading h1 {
        font-size: 34px;
    }

    .game-card {
        padding: 10px;
        border-radius: 15px;
    }

    .stats {
        gap: 6px;
    }

    .stat {
        padding: 8px 4px;
    }

    .stat strong {
        font-size: 18px;
    }

    .board-wrapper {
        padding: 8px;
    }

    .board {
        gap: 5px;
        padding: 6px;
    }

    .controls {
        gap: 12px;
        font-size: 10px;
    }

    .info {
        margin-top: 40px;
    }
}