:root {
    --bg: #fafafa;
    --text: #111;
    --accent: #FF3366;
    --card-bg: #ffffff;
    --card-border: #eaeaea;
}

body {
    margin: 0;
    font-family: 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Header */
.header {
    padding: 60px 40px;
    max-width: 1200px;
    margin: 0 auto;
}
.logo { font-size: 3rem; font-weight: 800; letter-spacing: -2px; margin: 0; }
.logo span { color: var(--accent); }
.subtitle { color: #666; margin-top: 10px; font-weight: 500; }

/* Grid */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
    padding: 0 40px 100px 40px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Card */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.5rem;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.08);
    border-color: var(--accent);
    color: var(--accent);
}

/* Messages */
.message {
    grid-column: 1 / -1;
    padding: 40px;
    background: #fff;
    border-radius: 12px;
    border: 2px solid #eee;
    text-align: center;
}
.error { border-color: #ffcccc; background: #fff5f5; color: #cc0000; }
.code { background: #eee; padding: 4px 8px; border-radius: 4px; font-family: monospace; }