/* ========================================
   Modern Design System 2025
   SVT Solutions
   ======================================== */

/* CSS Variables for consistent theming */
:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4338ca;
    --secondary-color: #06b6d4;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    /* Neutrals */
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray-900: #0f172a;
    --gray-800: #1e293b;
    --gray-700: #334155;
    --gray-600: #475569;
    --gray-500: #64748b;
    --gray-400: #94a3b8;
    --gray-300: #cbd5e1;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --white: #ffffff;
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    /* Borders */
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    /* Animations */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Base Styles
   ======================================== */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

    body.loaded {
        transition: var(--transition);
    }

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.875rem);
}

p {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

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

.section-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* ========================================
   Navigation
   ======================================== */

.navbar {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem 0;
    transition: var(--transition);
}

    .navbar.scrolled {
        background: rgba(15, 23, 42, 0.98);
        box-shadow: var(--shadow-lg);
    }

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--white);
    text-decoration: none;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
}

.brand-text {
    color: var(--white);
}

.brand-accent {
    color: var(--primary-light);
}

.navbar-nav .nav-link {
    color: var(--gray-300);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
        color: var(--white);
        background: rgba(99, 102, 241, 0.1);
    }

    .navbar-nav .nav-link::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        width: 0;
        height: 2px;
        background: var(--gradient-primary);
        transition: var(--transition);
        transform: translateX(-50%);
    }

    .navbar-nav .nav-link:hover::after,
    .navbar-nav .nav-link.active::after {
        width: 80%;
    }

/* ========================================
   Buttons
   ======================================== */

.btn {
    font-weight: 600;
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

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

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

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

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

.btn-outline-light {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

    .btn-outline-light:hover {
        background: rgba(255, 255, 255, 0.1);
        color: var(--white);
        border-color: rgba(255, 255, 255, 0.5);
    }

/* ========================================
   Hero Section
   ======================================== */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 70%, rgba(99, 102, 241, 0.1) 0%, transparent 50%), radial-gradient(circle at 70% 30%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.1;
    animation: float 20s infinite linear;
}

.shape-1 {
    width: 200px;
    height: 200px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 20%;
    animation-delay: -5s;
}

.shape-3 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    left: 70%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }

    25% {
        transform: translateY(-20px) rotate(90deg);
    }

    50% {
        transform: translateY(-40px) rotate(180deg);
    }

    75% {
        transform: translateY(-20px) rotate(270deg);
    }
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.hero-subtitle {
    font-size: 1.375rem;
    color: var(--gray-300);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-actions {
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-light);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Code Window */
.code-window {
    background: var(--gray-900);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    max-width: 500px;
    width: 100%;
}

.window-header {
    background: var(--gray-800);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid var(--gray-700);
}

.window-controls {
    display: flex;
    gap: 0.5rem;
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

    .control.close {
        background: #ff5f57;
    }

    .control.minimize {
        background: #ffbd2e;
    }

    .control.maximize {
        background: #28ca42;
    }

.window-title {
    color: var(--gray-400);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.code-content {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.code-line {
    margin-bottom: 0.5rem;
    animation: typingEffect 0.5s ease-out;
}

    .code-line.indent {
        margin-left: 2rem;
    }

    .code-line.indent2 {
        margin-left: 4rem;
    }

.keyword {
    color: #ff79c6;
}

.class-name {
    color: #8be9fd;
}

.type {
    color: #bd93f9;
}

.variable {
    color: #f8f8f2;
}

.method {
    color: #50fa7b;
}

.punctuation {
    color: #f8f8f2;
}

@keyframes typingEffect {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border: 2px solid var(--white);
    border-radius: 50%;
    position: relative;
    animation: bounce 2s infinite;
}

    .scroll-arrow::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%) rotate(45deg);
        width: 8px;
        height: 8px;
        border-bottom: 2px solid var(--white);
        border-right: 2px solid var(--white);
    }

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ========================================
   Animation Classes
   ======================================== */

.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s ease-out forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Services Section
   ======================================== */

.services-section {
    padding: var(--section-padding);
    background: var(--gray-50);
}

.service-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

    .service-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: var(--gradient-primary);
        transform: scaleX(0);
        transform-origin: left;
        transition: var(--transition);
    }

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

        .service-card:hover::before {
            transform: scaleX(1);
        }

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

.service-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.service-card p {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

    .service-features li {
        padding: 0.5rem 0;
        position: relative;
        padding-left: 1.5rem;
        color: var(--gray-600);
    }

        .service-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--success-color);
            font-weight: bold;
        }

/* ========================================
   Technologies Section
   ======================================== */

.technologies-section {
    padding: var(--section-padding);
    background: var(--white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    background: var(--gray-50);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
    border: 2px solid transparent;
}

    .tech-item:hover {
        background: var(--white);
        border-color: var(--primary-color);
        transform: translateY(-5px);
        box-shadow: var(--shadow-lg);
    }

.tech-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.tech-item span {
    font-weight: 600;
    color: var(--gray-700);
    text-align: center;
}

/* ========================================
   Contact Section
   ======================================== */

.contact-section {
    padding: var(--section-padding);
    background: var(--gray-50);
}

.contact-info {
    padding: 2rem 0;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
}

.contact-item h5 {
    margin: 0;
    color: var(--gray-900);
    font-weight: 600;
}

.contact-item p {
    margin: 0;
    color: var(--gray-600);
}

.contact-form {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.form-floating > .form-control {
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-size: 1rem;
    transition: var(--transition);
}

    .form-floating > .form-control:focus {
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    }

.form-floating > label {
    color: var(--gray-500);
}

/* ========================================
   Footer
   ======================================== */

.footer-section {
    background: var(--gray-900);
    color: var(--gray-300);
}

.footer-content {
    padding: 4rem 0 2rem;
}

.footer-brand .brand-logo {
    margin-bottom: 1rem;
}

.footer-description {
    color: var(--gray-400);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-title {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

    .footer-links li {
        margin-bottom: 0.75rem;
    }

    .footer-links a {
        color: var(--gray-400);
        text-decoration: none;
        transition: var(--transition);
    }

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

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding: 2rem 0;
}

.copyright {
    margin: 0;
    color: var(--gray-500);
}

.footer-bottom-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

    .footer-bottom-links a {
        color: var(--gray-400);
        text-decoration: none;
        transition: var(--transition);
    }

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

.separator {
    color: var(--gray-600);
}

/* ========================================
   Back to Top Button
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

    .back-to-top.show {
        opacity: 1;
        visibility: visible;
    }

    .back-to-top:hover {
        transform: translateY(-5px);
        box-shadow: var(--shadow-xl);
    }

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .hero-stats {
        justify-content: center;
        text-align: center;
    }

    .stat-item {
        align-items: center;
    }

    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 1rem;
    }

    .tech-item {
        padding: 1.5rem 1rem;
    }

    .service-card {
        padding: 2rem;
    }

    .contact-form {
        padding: 2rem;
    }

    .footer-bottom-links {
        justify-content: center;
        margin-top: 1rem;
    }
}

@media (max-width: 576px) {
    .hero-actions {
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

        .hero-actions .btn {
            width: 100%;
        }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

/* ========================================
   Utility Classes
   ======================================== */

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

.bg-gradient {
    background: var(--gradient-primary);
}

.shadow-custom {
    box-shadow: var(--shadow-xl);
}

.border-gradient {
    border: 2px solid;
    border-image: var(--gradient-primary) 1;
}

/* ========================================
   Loading States
   ======================================== */

.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.loaded .loading {
    opacity: 1;
    transform: translateY(0);
}