@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    transition: box-shadow 0.3s ease;
}

.container:hover {
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

h1 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #333;
    font-weight: 600;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 400;
    color: #555;
}

input[type="date"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input[type="date"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 20px;
}

button:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

button:active {
    transform: scale(0.98);
}

.error {
    color: #e74c3c;
    font-size: 0.9rem;
    margin-bottom: 20px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.error.show {
    opacity: 1;
}

.result {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.result.show {
    opacity: 1;
    transform: translateY(0);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
}

.result-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.label {
    font-weight: 400;
    color: #555;
}

.value {
    font-weight: 600;
    color: #333;
    font-size: 1.2rem;
}

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
        max-width: 90%;
    }

    h1 {
        font-size: 1.5rem;
    }

    button {
        padding: 10px 20px;
    }
}