/* Deep Learning Visual Approach - Main Styles */

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --dark-bg: #1a1a2e;
    --light-bg: #f7f7f9;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --error-color: #f56565;
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Coming Soon Styles */
.coming-soon-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 2rem;
}

.coming-soon-content {
    max-width: 800px;
    text-align: center;
    background: white;
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    border-top: 4px solid var(--primary-color);
}

.coming-soon-content h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.coming-soon-content ul {
    text-align: left;
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.coming-soon-content li {
    margin: 0.5rem 0;
    font-size: 1.1rem;
}

.chapter-preview {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-top: 2rem;
    border-left: 4px solid var(--accent-color);
}

.preview-content h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.preview-content p {
    font-style: italic;
    color: var(--text-secondary);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Header Styles */
.main-header {
    position: sticky;
    top: 0;
    background: white;
    box-shadow: var(--shadow-md);
    z-index: 1000;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.main-nav {
    flex-grow: 1;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    background: var(--light-bg);
    color: var(--primary-color);
}

.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: white;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    list-style: none;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background: var(--light-bg);
    color: var(--primary-color);
}

/* Progress Tracker */
.progress-tracker {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-bar {
    width: 150px;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    transition: width 0.5s ease;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 200px);
}

.content-section {
    display: none;
    animation: fadeIn 0.5s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 4rem 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 3rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Stats Cards */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.stat-card {
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* CTA Buttons */
.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

.btn-tertiary {
    background: var(--light-bg);
    color: var(--text-primary);
}

.btn-tertiary:hover {
    background: var(--border-color);
}

/* Featured Section */
.featured-section {
    margin-bottom: 3rem;
}

.featured-section h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-primary);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Learning Paths */
.learning-paths {
    margin-bottom: 3rem;
}

.learning-paths h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

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

.path-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border-top: 4px solid;
    transition: var(--transition);
}

.path-card.beginner {
    border-top-color: var(--success-color);
}

.path-card.intermediate {
    border-top-color: var(--warning-color);
}

.path-card.advanced {
    border-top-color: var(--error-color);
}

.path-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.path-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.path-card ul {
    list-style: none;
    margin: 1rem 0;
}

.path-card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.path-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
}

.btn-path {
    width: 100%;
    margin-top: 1rem;
}

/* Chapter Sections */
.chapter-header {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.chapter-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.chapter-progress {
    margin-top: 1rem;
}

/* Visualization Container */
.visualization-container {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.visualization-container h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.viz-box {
    background: var(--light-bg);
    border-radius: 0.5rem;
    padding: 2rem;
    margin-bottom: 1rem;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.viz-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1rem;
    background: var(--light-bg);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.viz-controls label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.viz-controls input[type="range"] {
    width: 150px;
}

.viz-controls button {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    transition: var(--transition);
}

.viz-controls button:hover {
    background: var(--secondary-color);
}

.viz-description {
    padding: 1rem;
    background: #f0f7ff;
    border-left: 4px solid var(--primary-color);
    border-radius: 0.25rem;
}

.viz-description p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Playground Styles */
.playground-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.playground-sidebar {
    background: var(--light-bg);
    border-radius: 0.5rem;
    padding: 1.5rem;
}

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

.layer-controls {
    margin-bottom: 2rem;
}

.layer-controls button {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    margin-bottom: 1rem;
}

#layer-list {
    background: white;
    border-radius: 0.25rem;
    padding: 0.5rem;
}

.training-params label {
    display: block;
    margin-bottom: 1rem;
}

.training-params input[type="range"] {
    width: 100%;
    margin-top: 0.5rem;
}

.control-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 2rem;
}

.btn-train {
    background: var(--success-color);
}

.btn-pause {
    background: var(--warning-color);
}

.btn-reset {
    background: var(--error-color);
}

.playground-main {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.network-visualization {
    background: var(--light-bg);
    border-radius: 0.5rem;
    padding: 2rem;
}

.training-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.metric-card {
    background: white;
    border-radius: 0.5rem;
    padding: 1rem;
    box-shadow: var(--shadow-sm);
}

.metric-card h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.metric-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Search Section */
.search-container {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.search-box {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

#search-input {
    flex-grow: 1;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-filters {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.search-filters label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

#search-results {
    min-height: 400px;
}

/* Footer */
.main-footer {
    background: var(--dark-bg);
    color: white;
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .playground-container {
        grid-template-columns: 1fr;
    }

    .playground-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        padding: 1rem;
    }

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

    .hero-title {
        font-size: 2rem;
    }

    .featured-grid,
    .path-grid {
        grid-template-columns: 1fr;
    }

    .training-metrics {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }