:root {
    --main-bg: #0d1117;
    --card-bg: #161b22;
    --accent: #238636;
    --text: #ffffff;
}

body {
    background-color: var(--main-bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

.timer-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 6px;
    border: 1px solid #30363d;
    text-align: center;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

#display {
    font-size: 4rem;
    font-weight: bold;
    margin: 1rem 0;
    font-family: monospace;
}

.input-group input {
    width: 60px;
    padding: 8px;
    background: var(--main-bg);
    border: 1px solid #30363d;
    color: white;
    border-radius: 4px;
    text-align: center;
}

button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 20px;
}

.settings {
    margin-top: 50px;
    padding: 15px;
    background: var(--card-bg);
    border-radius: 6px;
    font-size: 0.9rem;
}

.picker-row { display: flex; gap: 15px; }