@import url('https://fonts.googleapis.com/css2?family=Segoe+UI:wght@400;600&display=swap');

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: #fff;
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

h1, h2, h3 {
    color: #2c3e50;
}

.summary-card {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: #fff;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    display: flex;
    justify-content: space-between;
    box-shadow: 0 4px 6px rgba(52, 152, 219, 0.3);
    flex-wrap: wrap;
}

.summary-item {
    flex: 1;
    min-width: 200px;
    margin-bottom: 10px;
}

.summary-item h3 {
    color: #ecf0f1;
    margin-top: 0;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.summary-item p {
    font-size: 22px;
    font-weight: 600;
    margin: 5px 0 0;
}

.action-section {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: #fff;
    border: 1px solid #e0e0e0;
    padding: 20px;
    border-radius: 8px;
    flex: 1;
    min-width: 300px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.timer-display {
    font-size: 48px;
    font-weight: bold;
    text-align: center;
    margin: 15px 0;
    color: #34495e;
    font-variant-numeric: tabular-nums;
}

.btn {
    padding: 12px 15px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s ease;
    display: inline-block;
    width: 100%;
    text-align: center;
    box-sizing: border-box;
}

.btn-start {
    background-color: #2ecc71;
    color: white;
}

.btn-start:hover {
    background-color: #27ae60;
}

.btn-stop {
    background-color: #e74c3c;
    color: white;
}

.btn-stop:hover {
    background-color: #c0392b;
}

.btn-primary {
    background-color: #3498db;
    color: white;
    margin-top: 10px;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 15px;
}

.form-group input:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    border-bottom: 1px solid #eee;
    padding: 12px 15px;
    text-align: left;
}

th {
    background-color: #f8f9fa;
    color: #2c3e50;
    font-weight: 600;
}

tr:hover {
    background-color: #f1f5f8;
}

.text-center {
    text-align: center;
}

.hidden {
    display: none;
}