@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --bg-start: #0f1026;
    --bg-end: #1f2544;
    --card-bg: rgba(19, 24, 52, 0.78);
    --line: rgba(125, 147, 255, 0.25);
    --text-main: #f8faff;
    --text-muted: #b8c2ff;
    --accent: #79a8ff;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
    background: radial-gradient(circle at top, #2c3f8e 0%, var(--bg-start) 45%, var(--bg-end) 100%);
    color: var(--text-main);
}

.game-shell {
    width: min(92vw, 460px);
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 28px 28px 26px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.tag {
    margin: 0;
    font-size: 12px;
    letter-spacing: 0.26em;
    color: var(--accent);
    font-weight: 600;
}

h1 {
    margin: 10px 0 8px;
    font-size: clamp(34px, 8vw, 46px);
    line-height: 1;
}

.copyright {
    margin: 0 0 20px;
    color: var(--text-muted);
    font-size: 14px;
}

.copyright a {
    color: #a4beff;
    text-decoration: none;
    font-weight: 600;
}

.copyright a:hover {
    text-decoration: underline;
}

table {
    margin: 0 auto;
    border-collapse: separate;
    border-spacing: 10px;
}

.cell {
    height: clamp(86px, 20vw, 100px);
    width: clamp(86px, 20vw, 100px);
    text-align: center;
    font-size: clamp(54px, 12vw, 66px);
    font-weight: 700;
    cursor: pointer;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: rgba(8, 12, 34, 0.85);
    color: #ffffff;
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.cell:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(71, 114, 255, 0.35);
}

.gameOver {
    display: none;
    margin-top: 18px;
}

.text {
    margin: 0 0 10px;
    font-weight: 600;
    color: #f2f5ff;
}

button {
    border: 0;
    border-radius: 12px;
    padding: 10px 20px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    color: #0f1433;
    background: linear-gradient(140deg, #88b2ff 0%, #b4ccff 100%);
    cursor: pointer;
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(136, 178, 255, 0.32);
}

button:active {
    transform: translateY(0);
}