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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Red Hat Text", -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-optical-sizing: auto;
    line-height: 1.7;
    color: #2d3748;
    background-color: #ffffff;
    font-size: 16px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: "Red Hat Text", sans-serif;
    font-optical-sizing: auto;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1.5rem;
    color: #1a202c;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

h2 {
    font-size: 2.25rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.875rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
    line-height: 1.75;
}

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: #4a5568;
    margin-bottom: 2rem;
}

a {
    color: #3182ce;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #2c5282;
}

/* Code blocks */
pre, code {
    font-family: 'Fira Code', 'Monaco', 'Cascadia Code', monospace;
    background-color: #f7fafc;
    border-radius: 6px;
}

code {
    padding: 0.2em 0.4em;
    font-size: 0.9em;
}

pre {
    padding: 1.5rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e2e8f0;
    z-index: 1000;
    transition: all 0.2s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.nav-logo a {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a202c;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: #4a5568;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
    position: relative;
    text-decoration: none;
}

.nav-link:hover,
.nav-link.active {
    color: #3182ce;
}

/* Main Content */
.main-content {
    margin-top: 60px;
    min-height: calc(100vh - 60px);
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-bottom: 80px;
}

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

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.025em;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    font-weight: 400;
    line-height: 1.5;
}

.hero-cta {
    margin-top: 2.5rem;
}

.hero-image {
    margin-top: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

/* Buttons - Material Design Inspired */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.0125em;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(102, 126, 234, 0.2);
}

.btn-primary:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15), 0 8px 20px rgba(102, 126, 234, 0.35);
    transform: translateY(-2px);
    color: white;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(102, 126, 234, 0.2);
}

.btn-outline {
    background-color: white;
    color: #667eea;
    border: 1.5px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
}

.btn-outline:hover {
    background-color: #f8f9ff;
    border-color: #667eea;
    color: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1), 0 8px 16px rgba(102, 126, 234, 0.15);
}

.btn-outline:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
}

.btn-light {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-light:hover {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Button icons */
.btn svg {
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.btn > * {
    position: relative;
    z-index: 1;
}

/* Focused button state for accessibility */
.btn:focus-visible {
    outline: 3px solid rgba(102, 126, 234, 0.4);
    outline-offset: 2px;
}

/* Content Sections */
.content-section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    font-weight: 700;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    transition: all 0.2s ease;
}

.card:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1a202c;
}

.card-description {
    color: #4a5568;
    line-height: 1.6;
}

/* Grid layouts */
.grid {
    display: grid;
    gap: 2rem;
    margin-bottom: 3rem;
}

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

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.figure {
    margin: 2rem 0;
    text-align: center;
}

.figure img {
    max-width: 100%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.figure-caption {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: #6b7280;
    font-style: italic;
}

/* Lists */
ul, ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* Blockquotes */
blockquote {
    border-left: 4px solid #3182ce;
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: #4a5568;
}

/* Footer */
.footer {
    background-color: #f7fafc;
    padding: 3rem 0;
    margin-top: 4rem;
    border-top: 1px solid #e2e8f0;
    text-align: center;
    color: #6b7280;
}

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

    .hero-subtitle {
        font-size: 1.25rem;
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .container {
        padding: 0 16px;
    }

    .nav-container {
        padding: 0 16px;
    }

    .hero {
        padding: 80px 0 60px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .btn svg {
        width: 16px;
        height: 16px;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling for anchor links */
html {
    scroll-padding-top: 70px;
}

/* Focus styles for accessibility */
.btn:focus,
.nav-link:focus,
a:focus {
    outline: 2px solid #0066cc;
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar,
    .footer,
    .btn {
        display: none;
    }
    
    .main-content {
        margin-top: 0;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
}