/* style.css */
/* CSS Variables for easy theme management */
:root {
    --primary-font: 'Poppins', sans-serif;
    --primary-color: #4a90e2;
    --secondary-color: #f4f4f4;
    --background-color: #f0f2f5;
    --container-bg: rgba(255, 255, 255, 0.7);
    --text-color: #333;
    --border-color: #ccc;
    --focus-border-color: #4a90e2;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --hover-shadow-color: rgba(0, 0, 0, 0.2);
    --gradient-start: #4a90e2;
    --gradient-end: #50e3c2;
}

/* General Body Styles */
body {
    font-family: var(--primary-font);
    background-color: var(--background-color);
    background-image: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: var(--text-color);
    margin: 0;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

/* Main Container Styling */
.container {
    background: var(--container-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 40px 0 var(--hover-shadow-color);
}

/* Header and Footer */
header h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
}

footer {
    margin-top: 2rem;
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: text-decoration 0.3s ease;
}

footer a:hover {
    text-decoration: underline;
}

/* Form Styling */
.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group input[type="number"] {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: var(--primary-font);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    box-sizing: border-box;
}

.input-group input[type="number"]:focus {
    outline: none;
    border: 2px solid var(--focus-border-color);
    box-shadow: 0 0 5px rgba(74, 144, 226, 0.5);
}

.input-group input[aria-invalid="true"] {
    border-color: var(--error-color);
}

.error-message {
    color: var(--error-color);
    font-size: 0.8rem;
    margin-top: 0.3rem;
    min-height: 1rem;
}

/* Radio Button Styling */
.radio-group {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.radio-group label {
    cursor: pointer;
    display: flex;
    align-items: center;
}

/* Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn {
    padding: 0.9rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s;
}

.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px var(--shadow-color);
}

.btn:active {
    transform: scale(1);
    box-shadow: none;
}

.btn:focus-visible {
    outline: 3px solid var(--focus-border-color);
    outline-offset: 2px;
}

.btn-primary {
    background-image: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.btn-primary:hover {
    background-image: linear-gradient(45deg, #3a80d2, #40c3a2);
}

.btn-secondary {
    background-color: #e0e0e0;
    color: #555;
}

.btn-secondary:hover {
    background-color: #d0d0d0;
}

.btn-copy {
    background-color: #3498db;
    color: white;
}

.btn-download {
    background-color: #9b59b6;
    color: white;
}

/* Results Section */
.results-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: rgba(236, 240, 241, 0.8);
    border-radius: 10px;
}

.results-output {
    font-size: 1.1rem;
    line-height: 1.6;
    text-align: left;
}

.results-output p {
    margin: 0.5rem 0;
}

.results-output span {
    font-weight: 600;
    color: var(--primary-color);
}

/* Mobile-First Responsive Design */
@media (min-width: 600px) {
    .action-buttons {
        flex-direction: row;
        justify-content: center;
    }

    .btn {
        width: auto;
    }
}