/* ===================================
   CSS Variables & Design System
   =================================== */
:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary-color: #a855f7;
    --accent-color: #ec4899;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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;
    --font-size-6xl: 3.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    color: var(--gray-700);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-base);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    overflow: hidden;
    padding-top: 80px;
}

.floating-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    top: 50%;
    right: 10%;
    animation-delay: 5s;
}

.shape-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    bottom: 10%;
    left: 50%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
}

.btn:hover::before {
    transform: translateX(0);
}

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

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

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-sm);
}

/* ===================================
   Glass Card Effect
   =================================== */
.glass-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

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

/* ===================================
   Sections
   =================================== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--gray-600);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===================================
   Features Section
   =================================== */
.features {
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.feature-card {
    padding: var(--spacing-xl);
    text-align: center;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===================================
   Apps Section
   =================================== */
.apps-section {
    background: var(--white);
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.app-card {
    padding: var(--spacing-xl);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.app-name {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.app-description {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
    flex-grow: 1;
}

/* ===================================
   CTA Section
   =================================== */
.cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-3xl) 0;
}

.cta-content {
    text-align: center;
    padding: var(--spacing-2xl);
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer h3 {
    color: var(--white);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.footer h4 {
    color: var(--white);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.footer p {
    margin-bottom: var(--spacing-xs);
}

.footer a {
    color: var(--gray-300);
    transition: color var(--transition-base);
}

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

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-md);
    text-align: center;
    color: var(--gray-400);
}

/* ===================================
   Page Hero (Internal Pages)
   =================================== */
.page-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 8rem 0 4rem;
    text-align: center;
    margin-top: 60px;
}

.page-hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.page-hero p {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
}

/* ===================================
   About Page
   =================================== */
.about-content {
    background: var(--gray-50);
}

.about-section {
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.about-section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.about-section p {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

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

.credential-card {
    padding: var(--spacing-xl);
    text-align: center;
}

.credential-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.credential-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.credential-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.credential-institution {
    font-size: var(--font-size-base);
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

.credential-description {
    color: var(--gray-600);
    line-height: 1.7;
}

.expertise-section {
    margin-bottom: var(--spacing-xl);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.expertise-item {
    padding: var(--spacing-lg);
}

.expertise-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.expertise-item p {
    color: var(--gray-600);
    line-height: 1.7;
}

.vision-section {
    padding: var(--spacing-xl);
}

.vision-section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.vision-section p {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.vision-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.vision-list li {
    padding: var(--spacing-sm) 0;
    color: var(--gray-600);
    line-height: 1.7;
}

.vision-list strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===================================
   Contact Page
   =================================== */
.contact-section {
    background: var(--gray-50);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-card {
    padding: var(--spacing-xl);
}

.info-card h2,
.info-card h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.info-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.info-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.info-item h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.info-item p,
.info-item a {
    color: var(--gray-600);
}

.contact-form {
    padding: var(--spacing-xl);
}

.contact-form h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.error-message {
    display: block;
    color: #ef4444;
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.form-success {
    display: none;
    padding: var(--spacing-md);
    background: #10b981;
    color: var(--white);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    text-align: center;
}

.form-success.show {
    display: block;
}

/* ===================================
   Legal Pages
   =================================== */
.legal-content {
    background: var(--gray-50);
}

.legal-document {
    padding: var(--spacing-2xl);
    max-width: 900px;
    margin: 0 auto;
}

.legal-document h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.legal-document h2:first-child {
    margin-top: 0;
}

.legal-document h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-800);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.legal-document p {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.legal-document ul {
    list-style: disc;
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.legal-document li {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-xs);
}

.legal-document a {
    color: var(--primary-color);
    text-decoration: underline;
}

/* ===================================
   Animations
   =================================== */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease-in forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.slide-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.slide-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .page-hero h1 {
        font-size: var(--font-size-4xl);
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-base);
        pointer-events: none;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .contact-grid,
    .credentials-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .page-hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .shape {
        width: 200px !important;
        height: 200px !important;
    }
}