*,
*::before,
*::after {
    box-sizing: border-box;
}

:root {
    --green: #2ecc71;
    --purple: #9b59b6;
    --muted: #7f8c8d;
    --dark: #2c3e50;
    --light-gray: #ecf0f1;
    --white-pill: #ecf0f1;
    --black-pill: #2c3e50;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --radius: 8px;
    --grid-8: 8px;
    --board-size: 300px;
    --board-label: 26px;
    --board-label-row: 22px;
}

body {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    color: var(--dark);
}

h1 { color: #333; }
h2 { color: #333; font-weight: 700; font-size: 20px; }

.error { color: red; padding: 20px; }

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.logout-btn {
    padding: 8px 16px;
    background-color: #f44336;
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
}

@media (max-width: 600px) {
    body {
        padding: 12px;
    }
    .header {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 16px;
    }
    .user-info img {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 8px;
    }
    h1 {
        font-size: 18px;
    }
    h2 {
        font-size: 17px;
    }
}