:root {
    --pastel-yellow: #FFF9C4;
    --pastel-green: #C8E6C9;
    --pastel-orange: #FFE0B2;
    --dark-green: #2E7D32;
    --dark-orange: #E65100;
    --white: #FFFFFF;
    --light-gray: #F5F5F5;
    --medium-gray: #E0E0E0;
    --dark-gray: #424242;
    --error-red: #D32F2F;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.logo-container h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--dark-green);
    margin: 0;
}

.tagline {
    color: var(--dark-orange);
    font-weight: 300;
    font-size: 1.1rem;
}

main {
    flex: 1;
}

.card {
    background-color: var(--white);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    margin-bottom: 2rem;
}

.card h2 {
    color: var(--dark-green);
    margin-bottom: 1.5rem;
    font-weight: 500;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-gray);
}

input[type="text"] {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--medium-gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--pastel-orange);
    box-shadow: 0 0 0 3px rgba(255, 224, 178, 0.5);
}

.radio-group {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.radio-option {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.radio-button {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--medium-gray);
    border-radius: 50%;
    margin-right: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.radio-button::after {
    content: '';
    width: 0.75rem;
    height: 0.75rem;
    background-color: var(--dark-orange);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.radio-option input[type="radio"]:checked ~ .radio-button {
    border-color: var(--dark-orange);
}

.radio-option input[type="radio"]:checked ~ .radio-button::after {
    opacity: 1;
}

.radio-label {
    font-weight: 400;
}

.duration-message {
    margin-top: 0.5rem;
    color: var(--dark-orange);
    font-weight: 500;
}

.primary-button {
    background-color: var(--dark-orange);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    width: 100%;
    margin-top: 0.5rem;
}

.primary-button:hover {
    background-color: #F57C00;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.primary-button:disabled {
    background-color: var(--medium-gray);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.error {
    color: var(--error-red);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.loading {
    display: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s ease-in-out infinite;
    margin-left: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.result-card, .error-card {
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    display: none;
}

.result-card {
    background-color: var(--pastel-green);
    border-left: 6px solid var(--dark-green);
}

.error-card {
    background-color: #FFEBEE;
    border-left: 6px solid var(--error-red);
}

.result-content, .error-content {
    font-weight: 500;
}

footer {
    text-align: center;
    margin-top: 2rem;
    color: var(--dark-gray);
    font-size: 0.875rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 0.75rem;
    }
}