/* CSS Variables */
:root {
    --primary-blue: #02457A;
    --secondary-blue: #0077be;
    --dark-blue: #003856;
    --light-blue: #4A90E2;
    --accent-blue: #6BA3F5;
    --accent-purple: #8B5CF6;
    --light-purple: #A78BFA;
    --gradient-primary: linear-gradient(135deg, #02457A 0%, #0077be 50%, #4A90E2 100%);
    --gradient-secondary: linear-gradient(45deg, #003856 0%, #02457A 100%);
    --gradient-purple-accent: linear-gradient(135deg, #8B5CF6 0%, #A78BFA 50%, #6BA3F5 100%);
    --background: #f8fbff;
    --card-bg: #ffffff;
    --text-dark: #1a365d;
    --text-light: #4a5568;
    --border: #e2e8f0;
    --shadow: 0 10px 30px rgba(2, 69, 122, 0.15);
    --shadow-hover: 0 20px 40px rgba(2, 69, 122, 0.25);
    --purple-shadow: 0 8px 25px rgba(139, 92, 246, 0.2);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--background);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

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

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-blue);
}

.nav-brand i {
    font-size: var(--font-size-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.nav-logo {
    width: 30px;
    height: 30px;
    object-fit: contain;
    filter: drop-shadow(0 0 3px rgba(2, 69, 122, 0.5));
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-blue);
    background: rgba(2, 69, 122, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    transition: var(--transition-fast);
}

/* External nav link styling */
.nav-link-external {
    background: var(--gradient-primary);
    color: white !important;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link-external:hover {
    background: var(--gradient-secondary);
    color: white !important;
    box-shadow: var(--shadow);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 70px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.05;
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(2, 69, 122, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(2, 69, 122, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

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

.hero-visual {
    position: relative;
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-card {
    position: absolute;
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: float 6s ease-in-out infinite;
}

.floating-card i {
    font-size: var(--font-size-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: 20%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 30%;
    left: 30%;
    animation-delay: 4s;
}

/* About Section */
.about {
    padding: var(--spacing-2xl) 0;
    background: var(--card-bg);
}

/* Technologies Section */
.technologies {
    padding: var(--spacing-2xl) 0;
}

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

.tech-card {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    border: 1px solid var(--border);
}

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

.main-tech {
    grid-column: span 2;
    background: var(--gradient-primary);
    color: white;
}

.main-tech h3,
.main-tech p {
    color: white;
}

.tech-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-purple-accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    padding: 10px;
    overflow: hidden;
}

.main-tech .tech-icon {
    background: rgba(255, 255, 255, 0.2);
}

.tech-icon i {
    font-size: var(--font-size-xl);
    color: white;
}

.tech-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.tech-card h3 {
    margin-bottom: var(--spacing-sm);
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tech-tag {
    background: rgba(2, 69, 122, 0.1);
    color: var(--primary-blue);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
}

.main-tech .tech-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* Architecture Section */
.architecture {
    padding: var(--spacing-2xl) 0;
    background: var(--card-bg);
}

.architecture-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.architecture-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.architecture-image:hover .image-overlay {
    opacity: 1;
}

.architecture-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.detail-card {
    background: var(--background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-blue);
}

.detail-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

/* Team Section */
.team {
    padding: var(--spacing-2xl) 0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    justify-items: center;
}

.team-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-normal);
    max-width: 350px;
}

.team-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.team-image {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.team-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.team-image:hover .team-overlay {
    opacity: 0.9;
}

.team-social {
    display: flex;
    gap: var(--spacing-md);
}

.team-social a {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
    transition: var(--transition-fast);
}

.team-social a:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.team-info {
    padding: var(--spacing-lg);
    text-align: center;
}

.team-role {
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
    background: var(--gradient-secondary);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.footer-brand i {
    font-size: var(--font-size-xl);
}

.footer-text p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xs);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
}

.modal-content {
    position: relative;
    margin: 5% auto;
    width: 90%;
    max-width: 1000px;
}

.modal-content img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

.close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--card-bg);
        width: 100%;
        text-align: center;
        transition: var(--transition-normal);
        box-shadow: var(--shadow);
        padding: var(--spacing-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .hero-visual {
        height: 300px;
    }

    .architecture-container {
        grid-template-columns: 1fr;
    }

    .main-tech {
        grid-column: span 1;
    }

    .hero-buttons {
        justify-content: center;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .floating-card {
        padding: var(--spacing-sm);
        font-size: 14px;
    }

    .floating-card i {
        font-size: var(--font-size-base);
    }
}