/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --silk-white: #faf9f7;
    --silk-cream: #f5f3f0;
    --silk-beige: #e8e4df;
    --silk-taupe: #d4cfc7;
    --silk-brown: #8b7d6b;
    --silk-dark: #4a453e;
    --accent-blue: #6366f1;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --text-primary: #2d2926;
    --text-secondary: #6b6560;
    --shadow-light: 0 2px 8px rgba(139, 125, 107, 0.1);
    --shadow-medium: 0 4px 16px rgba(139, 125, 107, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--silk-white);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

/* Screen Reader Only Content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header and Navigation */
header {
    background-color: var(--silk-cream);
    border-bottom: 1px solid var(--silk-beige);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--silk-dark);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.nav-menu a:hover,
.nav-menu a:focus {
    color: var(--accent-blue);
    background-color: var(--silk-beige);
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--silk-dark);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--silk-white) 0%, var(--silk-cream) 100%);
}

.hero h2 {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-blue);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.cta-button:hover,
.cta-button:focus {
    background-color: #4f46e5;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Courses Section */
.courses {
    padding: 6rem 0;
    background-color: var(--silk-cream);
}

.courses h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.course-card {
    background-color: var(--silk-white);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid var(--silk-beige);
}

.course-card:hover,
.course-card:focus {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.course-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin-bottom: 1.5rem;
}

.python-icon {
    background: linear-gradient(135deg, #3776ab 0%, #ffd43b 100%);
}

.web-icon {
    background: linear-gradient(135deg, #e34f26 0%, #1572b6 50%, #f7df1e 100%);
}

.course-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.course-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.course-topics {
    list-style: none;
    margin-bottom: 2rem;
}

.course-topics li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.course-topics li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: bold;
}

.course-button {
    background-color: var(--accent-blue);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.course-button:hover,
.course-button:focus {
    background-color: #4f46e5;
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Practice Section */
.practice {
    padding: 6rem 0;
    background-color: var(--silk-white);
}

.practice h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.editor-container {
    background-color: var(--silk-cream);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--silk-beige);
}

.editor-tabs {
    display: flex;
    background-color: var(--silk-taupe);
    border-bottom: 1px solid var(--silk-beige);
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.tab-button.active,
.tab-button:hover,
.tab-button:focus {
    color: var(--accent-blue);
    background-color: var(--silk-cream);
    border-bottom-color: var(--accent-blue);
    outline: 2px solid var(--accent-blue);
    outline-offset: -2px;
}

.editor-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 400px;
}

.code-input {
    border-right: 1px solid var(--silk-beige);
}

#code-editor {
    width: 100%;
    height: 400px;
    border: none;
    padding: 1.5rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
    background-color: var(--silk-white);
    color: var(--text-primary);
    resize: none;
    outline: none;
}

#code-editor:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: -2px;
}

.code-output {
    padding: 1.5rem;
    background-color: var(--silk-white);
}

.code-output h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

#output {
    background-color: var(--silk-cream);
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
    min-height: 100px;
    white-space: pre-wrap;
    color: var(--text-primary);
    border: 1px solid var(--silk-beige);
}

.editor-controls {
    padding: 1rem 1.5rem;
    background-color: var(--silk-taupe);
    display: flex;
    gap: 1rem;
}

.run-button,
.clear-button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.run-button {
    background-color: var(--accent-green);
    color: white;
}

.run-button:hover,
.run-button:focus {
    background-color: #059669;
    outline: 2px solid var(--accent-green);
    outline-offset: 2px;
}

.clear-button {
    background-color: var(--silk-beige);
    color: var(--text-primary);
}

.clear-button:hover,
.clear-button:focus {
    background-color: var(--silk-taupe);
    outline: 2px solid var(--silk-brown);
    outline-offset: 2px;
}

/* About Section */
.about {
    padding: 6rem 0;
    background-color: var(--silk-cream);
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature {
    text-align: center;
    padding: 2rem;
    background-color: var(--silk-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--silk-beige);
}

.feature h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature p {
    color: var(--text-secondary);
}

/* Footer */
footer {
    background-color: var(--silk-dark);
    color: var(--silk-cream);
    text-align: center;
    padding: 2rem 0;
}

/* Learning Page Styles */
.learning-header {
    background: linear-gradient(135deg, var(--silk-white) 0%, var(--silk-cream) 100%);
    padding: 4rem 0;
    text-align: center;
}

.back-button {
    display: inline-block;
    color: var(--accent-blue);
    text-decoration: none;
    margin-bottom: 2rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
}

.back-button:hover,
.back-button:focus {
    background-color: var(--silk-beige);
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.learning-header h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.learning-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.course-progress {
    background-color: var(--silk-white);
    border-radius: var(--border-radius);
    padding: 2rem;
    max-width: 500px;
    margin: 0 auto;
    box-shadow: var(--shadow-light);
}

.course-progress h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.progress-bar {
    background-color: var(--silk-beige);
    border-radius: 10px;
    height: 10px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    background-color: var(--accent-green);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.lesson-section {
    margin: 2rem 0;
    background-color: var(--silk-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--silk-beige);
}

.lesson-header {
    padding: 1.5rem 2rem;
    cursor: pointer;
    border-bottom: 1px solid var(--silk-beige);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.lesson-header:hover {
    background-color: var(--silk-cream);
}

.lesson-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0;
}

.lesson-arrow {
    font-size: 1.2rem;
    color: var(--accent-blue);
    transition: transform 0.3s ease;
}

.lesson-content {
    display: none;
    padding: 2rem;
}

.lesson-content.active {
    display: block;
}

.lesson-objectives {
    background-color: var(--silk-cream);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.lesson-objectives h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.lesson-objectives ul {
    color: var(--text-secondary);
    padding-left: 1.5rem;
}

.lesson-objectives li {
    margin-bottom: 0.5rem;
}

.exercise-container {
    background-color: var(--silk-cream);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin: 2rem 0;
}

.exercise-container h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.code-editor {
    width: 100%;
    height: 300px;
    border: 1px solid var(--silk-beige);
    border-radius: 8px;
    padding: 1rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
    background-color: var(--silk-white);
    color: var(--text-primary);
    resize: vertical;
    outline: none;
}

.code-editor:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.web-editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.web-preview {
    border: 1px solid var(--silk-beige);
    border-radius: 8px;
    padding: 1rem;
    min-height: 300px;
    background-color: var(--silk-white);
    overflow: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--silk-cream);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-medium);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero h2 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .course-grid {
        grid-template-columns: 1fr;
    }

    .editor-content {
        grid-template-columns: 1fr;
    }

    .code-input {
        border-right: none;
        border-bottom: 1px solid var(--silk-beige);
    }

    .container {
        padding: 0 1rem;
    }

    .web-editor-container {
        grid-template-columns: 1fr;
    }

    .learning-header h1 {
        font-size: 2rem;
    }
}

/* Focus Management */
*:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #333333;
        --silk-white: #ffffff;
        --silk-cream: #f8f8f8;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}