/**
 * AI Lesson Generator - Styles
 * Modern, clean, and accessible design
 */

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

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --error-color: #ef4444;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-color: #111827;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --border-radius: 8px;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
}

main {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
}

.form-container {
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 1px;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group small {
    display: block;
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
    margin-top: 10px;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-secondary:hover {
    background-color: #4b5563;
}

.error-message {
    background-color: #fef2f2;
    border: 2px solid var(--error-color);
    border-radius: var(--border-radius);
    padding: 15px;
    margin: 20px 0;
    color: var(--error-color);
    font-weight: 500;
}

.lesson-plan-container {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

.lesson-plan-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.lesson-plan-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.lesson-plan {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 25px;
    line-height: 1.8;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.lesson-plan h1,
.lesson-plan h2,
.lesson-plan h3 {
    margin-top: 25px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.lesson-plan h1 {
    font-size: 1.8rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 10px;
}

.lesson-plan h2 {
    font-size: 1.4rem;
    color: var(--primary-color);
}

.lesson-plan h3 {
    font-size: 1.2rem;
}

.lesson-plan p {
    margin-bottom: 15px;
}

.lesson-plan ul,
.lesson-plan ol {
    margin: 15px 0;
    padding-left: 30px;
}

.lesson-plan li {
    margin-bottom: 8px;
}

.lesson-plan strong {
    color: var(--primary-color);
    font-weight: 600;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

footer p {
    margin: 5px 0;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    z-index: 100;
    border-radius: 0 0 var(--border-radius) 0;
    text-decoration: none;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* Focus indicators for buttons and links */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    main {
        padding: 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .lesson-plan-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .lesson-plan {
        padding: 15px;
        font-size: 0.95rem;
    }

    footer a {
        display: inline-block;
        padding: 12px 4px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    main {
        padding: 15px;
    }
}

/* Loading animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.btn-loader {
    display: inline-block;
    animation: spin 1s linear infinite;
}

/* Print styles */
@media print {
    body {
        background: white;
    }

    .form-container,
    .error-message,
    .lesson-plan-header button,
    footer {
        display: none;
    }

    .lesson-plan {
        background: white;
        border: none;
        padding: 0;
    }
}