/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-navy: #1a2332;
    --secondary-green: #00d4aa;
    --accent-silver: #8892b0;
    --text-light: #ffffff;
    --text-dark: #2d3748;
    --text-muted: #718096;
    --background-light: #ffffff;
    --background-dark: #0f1419;
    --background-section: #f7fafc;
    --border-color: #e2e8f0;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --max-width: 1200px;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-light);
    scroll-behavior: smooth;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); }

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

/* Container and layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

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

.nav-brand h1 {
    color: var(--primary-navy);
    font-weight: 700;
    font-size: 1.5rem;
    margin: 0;
}

.code-emphasis {
    font-family: var(--font-mono);
    color: var(--secondary-green);
    font-weight: 500;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--secondary-green);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-green);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 8rem 0 6rem;
    background: linear-gradient(135deg, var(--background-light) 0%, var(--background-section) 100%);
    margin-top: 80px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    color: var(--primary-navy);
    font-weight: 700;
    margin-bottom: 1.5rem;
    font-size: clamp(2.5rem, 6vw, 4rem);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 3vw, 1.25rem);
    color: var(--text-muted);
    margin-bottom: 3rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--secondary-green);
    color: var(--text-light);
    border-color: var(--secondary-green);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--secondary-green);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-navy);
    border-color: var(--primary-navy);
}

.btn-secondary:hover {
    background-color: var(--primary-navy);
    color: var(--text-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.approach-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

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

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

/* Cards */
.card {
    background: var(--background-light);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

/* CODE section */
.section-dark {
    background-color: var(--primary-navy);
    color: var(--text-light);
}

.section-dark .section-header h2 {
    color: var(--text-light);
}

.section-dark .section-header p {
    color: var(--accent-silver);
}

.code-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.code-item:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.08);
}

.code-letter {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    color: var(--secondary-green);
    margin-bottom: 1rem;
    line-height: 1;
}

.code-item h3 {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.code-item ul {
    list-style: none;
    padding: 0;
}

.code-item li {
    color: var(--accent-silver);
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    position: relative;
}

.code-item li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--secondary-green);
    font-weight: 500;
}

/* Approach section */
.approach-item {
    background: var(--background-light);
    padding: 2rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--secondary-green);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.approach-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.approach-item h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
}

.competitive-edge {
    margin-top: 4rem;
    text-align: center;
}

.competitive-edge h3 {
    color: var(--primary-navy);
    margin-bottom: 2rem;
    font-size: 1.75rem;
}

.advantage-item {
    background: var(--background-section);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: left;
}

.advantage-item strong {
    color: var(--primary-navy);
}

/* CTA Section */
.section-cta {
    background: linear-gradient(135deg, var(--secondary-green) 0%, #00b894 100%);
    color: var(--text-light);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.section-cta .btn-primary {
    background-color: var(--text-light);
    color: var(--secondary-green);
    border-color: var(--text-light);
}

.section-cta .btn-primary:hover {
    background-color: transparent;
    color: var(--text-light);
    border-color: var(--text-light);
}

/* Footer */
.footer {
    background-color: var(--primary-navy);
    color: var(--text-light);
    padding: 2rem 0;
}

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

.footer-brand h3 {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: var(--accent-silver);
    margin: 0;
}

.footer-links p {
    color: var(--accent-silver);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-menu {
        gap: 1.5rem;
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .code-grid {
        grid-template-columns: 1fr;
    }
    
    .approach-grid {
        grid-template-columns: 1fr;
    }
    
    .advantage-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .code-letter {
        font-size: 2.5rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    animation-delay: 0.1s;
}

.hero-subtitle {
    animation-delay: 0.2s;
}

.hero-cta {
    animation-delay: 0.3s;
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
    .card,
    .code-item,
    .approach-item {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }
    
    .card.animate,
    .code-item.animate,
    .approach-item.animate {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Focus styles for accessibility */
.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--secondary-green);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-muted: var(--text-dark);
        --border-color: var(--text-dark);
    }
}