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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #e74c3c;
    --accent-color: #3498db;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 20px rgba(0,0,0,0.15);
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.btn {
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: white;
    color: #667eea;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-light {
    background: var(--bg-light);
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--primary-color);
}

.lead {
    font-size: 1.25rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-light);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Content Box */
.content-box {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.metric-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

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

.metric-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.metric-label {
    color: var(--text-light);
    font-weight: 500;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

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

.info-card ul {
    list-style: none;
    padding-left: 0;
}

.info-card li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
}

.info-card li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Pipeline Stages */
.pipeline-stages {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 3rem 0;
}

.pipeline-stage {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    flex: 1;
    min-width: 150px;
    max-width: 180px;
    text-align: center;
}

.stage-number {
    width: 40px;
    height: 40px;
    background: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-weight: 700;
    font-size: 1.2rem;
}

.pipeline-stage h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.pipeline-stage p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0.25rem 0;
}

.pipeline-arrow {
    font-size: 2rem;
    color: var(--accent-color);
    font-weight: 700;
}

/* Tables */
.data-table,
.challenges-table {
    width: 100%;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    margin: 2rem 0;
}

.data-table thead,
.challenges-table thead {
    background: var(--primary-color);
    color: white;
}

.data-table th,
.data-table td,
.challenges-table th,
.challenges-table td {
    padding: 1rem;
    text-align: left;
}

.data-table tbody tr:nth-child(even),
.challenges-table tbody tr:nth-child(even) {
    background: var(--bg-light);
}

.data-table tbody tr:hover,
.challenges-table tbody tr:hover {
    background: #e3f2fd;
}

/* Code Block */
.code-block {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Model Cards */
.model-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.model-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.model-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.spec-table {
    width: 100%;
    margin-top: 1rem;
}

.spec-table tr {
    border-bottom: 1px solid var(--border-color);
}

.spec-table td {
    padding: 0.75rem 0;
}

.spec-table td:first-child {
    width: 50%;
}

/* Hardware Requirements */
.hardware-requirements {
    margin: 3rem 0;
}

.hw-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.hw-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
}

.hw-card.recommended {
    border-color: var(--accent-color);
    position: relative;
}

.hw-card.recommended::before {
    content: "RECOMMENDED";
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

.hw-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Quality Indicators */
.quality-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.quality-item {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
}

.quality-label {
    display: block;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.quality-value {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.quality-value.high {
    background: #4caf50;
    color: white;
}

.quality-item p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 0.5rem;
}

/* Sample Interactions */
.sample-interactions {
    margin: 3rem 0;
}

.interaction-box {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.interaction {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.interaction:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.user-message {
    background: #e3f2fd;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-color);
}

.model-response {
    background: #f5f5f5;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

/* Applications Grid */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.app-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

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

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

.app-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Dependencies */
.dep-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.dep-item {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.dep-item strong {
    color: var(--accent-color);
    display: block;
    margin-bottom: 0.5rem;
}

.dep-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Ethics Cards */
.ethics-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.ethics-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--accent-color);
}

.ethics-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.ethics-card ul {
    list-style: none;
    padding-left: 0;
}

.ethics-card li {
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    position: relative;
}

.ethics-card li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: 700;
}

/* Future Grid */
.future-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.future-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.future-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.future-card ul {
    list-style: none;
    padding-left: 0;
}

.future-card li {
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    position: relative;
}

.future-card li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Conclusion */
.section-conclusion {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.section-conclusion .section-title {
    color: white;
}

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

.achievements {
    margin: 3rem 0;
}

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

.achievement-grid {
    display: grid;
    gap: 1.5rem;
}

.achievement-item {
    background: rgba(255,255,255,0.1);
    padding: 1.5rem;
    border-radius: 10px;
    display: flex;
    gap: 1rem;
    align-items: start;
}

.achievement-icon {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.achievement-text strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.achievement-text p {
    opacity: 0.9;
    font-size: 0.95rem;
}

.closing-text {
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
    margin-top: 2rem;
    opacity: 0.95;
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.8;
}

/* Utility Classes */
.mt-4 {
    margin-top: 2rem;
}

.dataset-details,
.challenges-section,
.file-structure,
.dependencies,
.ethics-section,
.future-enhancements {
    margin: 3rem 0;
}

.dataset-details h3,
.challenges-section h3,
.file-structure h3,
.dependencies h3,
.ethics-section h3,
.future-enhancements h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }

    .pipeline-stages {
        flex-direction: column;
    }

    .pipeline-arrow {
        transform: rotate(90deg);
    }

    .metrics-grid,
    .applications-grid,
    .dep-grid,
    .quality-grid {
        grid-template-columns: 1fr;
    }

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

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--accent-color);
    color: white;
}