body {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f172a, #1e293b, #0f766e);
    color: #f8fafc;
}

.main-card {
    max-width: 560px;
    margin: auto;
    border: 0;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.clock-box {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.date-box {
    color: #64748b;
}

.brand-badge {
    background: rgba(20, 184, 166, 0.12);
    color: #0f766e;
    border: 1px solid rgba(20, 184, 166, 0.25);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 600;
}

.action-button {
    border-radius: 16px;
    padding: 14px 18px;
    font-weight: 600;
}

.hidden {
    display: none;
}