:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent-color: #fbbf24; /* Altın sarısı detaylar */
    --text-color: #f8fafc;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 20px;
    width: 100%;
    max-width: 400px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

button {
    background: var(--accent-color);
    color: black;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
}

.timer-display {
    font-size: 3rem;
    text-align: center;
    color: var(--accent-color);
    margin: 10px 0;
    font-variant-numeric: tabular-nums;
}