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

/* CSS Custom Properties for Theme Support */
:root {
    /* Light Theme Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #e2b007;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-large: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
    border-radius: 4px;
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* 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: background-color var(--transition-normal);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
}

.logo-text {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.logo-subtext {
    font-size: var(--font-size-lg);
    margin-left: var(--spacing-2);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-8);
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    padding: var(--spacing-2);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-secondary);
}

.cta-button {
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: 6px;
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.cta-button:hover {
    background: var(--primary-dark);
}

/* Mobile Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    margin: 2px 0;
    transition: var(--transition-fast);
}

/* Hero Section with Parallax */
.hero-section {
    position: relative;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: left;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 120%;
    z-index: -2;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    will-change: transform;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.8), rgba(15, 23, 42, 0.6));
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: left;
    color: white;
    max-width: 800px;
    padding: 0 var(--spacing-4);
    margin-left: 50px;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-8);
    opacity: 0.95;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.hero-cta {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    padding: var(--spacing-5) var(--spacing-8);
    border-radius: 8px;
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-large);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 30px -5px rgba(0, 0, 0, 0.2);
}

/* Main Content Sections */
.main {
    margin-top: 70px;
}

.content-section {
    padding: var(--spacing-20) 0;
}

.content-section:nth-child(even) {
    background: var(--bg-secondary);
}

/* Introduction Section */
.introduction {
    text-align: center;
}

.intro-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-8);
    color: var(--text-primary);
}

.intro-text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-6);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin: var(--spacing-16) 0;
}

.feature-card {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    text-align: center;
    transition: transform var(--transition-normal);
    overflow: hidden;
    border: 1px solid var(--border-color);
}
/* Feature header image: seamless, rounded top corners */
.feature-header-image {
    width: 100%;
    overflow: hidden;
    display: block;
    border-radius: 12px 12px 0 0;
    margin-bottom: 0;
    padding: 0;
}

.feature-header-image img {
    display: block;
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: 12px 12px 0 0;
    margin: 0;
    padding: 0;
}

.feature-card-text {
    padding: var(--spacing-4);
    color: var(--text-primary);
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-4);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
    padding-left: var(--spacing-8);
    padding-right: var(--spacing-8);
}

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

.cta-section {
    margin-top: var(--spacing-16);
}

.cta-button-secondary {
    background: var(--bg-primary);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    text-decoration: none;
    padding: var(--spacing-4) var(--spacing-8);
    margin: var(--spacing-4) 0;
    border-radius: 8px;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: inline-block;
}

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

/* Services Preview */
.services-preview h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
}

.service-card {
    background: var(--bg-primary);
    padding: var(--spacing-8);
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.service-card:hover {
    transform: translateY(-4px);
}

.service-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-4);
}

.service-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-6);
}

.service-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    margin-top: auto;
    display: block;
}

.service-link:hover {
    color: var(--primary-dark);
}

/* Substance Section */
.substance-section {
    background: var(--bg-primary);
}

.substance-section h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
}

.substance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
}

.substance-item {
    text-align: center;
    padding: var(--spacing-6);
}

.substance-item h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--primary-color);
}

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

/* Final CTA */
.cta-section-final {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
}

.final-cta h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-6);
}

.final-cta p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-8);
    opacity: 0.9;
}

.cta-button-large {
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    padding: var(--spacing-5) var(--spacing-10);
    margin: var(--spacing-5) 0;
    border-radius: 8px;
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-large);
    display: inline-block;
}

.cta-button-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 30px -5px rgba(0, 0, 0, 0.3);
}

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: 80px;
    right: var(--spacing-4);
    z-index: 1001;
    max-width: 400px;
}

.flash-message {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-2);
    box-shadow: var(--shadow-medium);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flash-success {
    border-color: #10b981;
    color: #065f46;
    background: #d1fae5;
}

.flash-error {
    border-color: #ef4444;
    color: #991b1b;
    background: #fee2e2;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.footer-section h3,
.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2);
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.footer-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.footer-form input,
.footer-form textarea {
    padding: var(--spacing-3);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
}

.footer-submit {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-3);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.footer-submit:hover {
    background: var(--primary-dark);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-2);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--border-color);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-6);
}

.footer-legal a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--primary-color);
}

.footer-social a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-social a:hover {
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        flex-direction: column;
        padding: var(--spacing-4);
        gap: var(--spacing-4);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-actions .cta-button {
        display: none;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .content-section {
        padding: var(--spacing-12) 0;
    }
    
    .features-grid,
    .services-grid,
    .substance-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-4);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .hero-content {
        padding: 0 var(--spacing-3);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .flash-messages {
        right: var(--spacing-3);
        left: var(--spacing-3);
        max-width: none;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .hero-section,
    .cta-button,
    .cta-button-secondary,
    .cta-button-large,
    .theme-toggle {
        display: none !important;
    }
    
    .main {
        margin-top: 0;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
}