/* ============================================
   VERTEX AI ACADEMY — STYLES
   Modern LogisticsTech Campus Design
   ============================================ */

/* ------------------------------------------
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ------------------------------------------ */
:root {
    /* Core Colors */
    --color-graphite-900: #0a0f1a;
    --color-graphite-800: #111827;
    --color-graphite-700: #1a2332;
    --color-graphite-600: #243447;
    
    /* Accent Colors */
    --color-blue-400: #60a5fa;
    --color-blue-500: #3b82f6;
    --color-blue-600: #2563eb;
    --color-cyan-400: #22d3ee;
    --color-cyan-500: #06b6d4;
    
    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-100: #f3f4f6;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-blue-500), var(--color-cyan-400));
    --gradient-hero: linear-gradient(180deg, var(--color-graphite-900) 0%, var(--color-graphite-800) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
    
    /* Glassmorphism */
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: 20px;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* ------------------------------------------
   2. RESET & BASE STYLES
   ------------------------------------------ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    background: var(--color-graphite-900);
    color: var(--color-gray-100);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

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

ul {
    list-style: none;
}

/* ------------------------------------------
   3. BACKGROUND CANVAS
   ------------------------------------------ */
.background-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ------------------------------------------
   4. UTILITY CLASSES
   ------------------------------------------ */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

.centered {
    text-align: center;
}

/* ------------------------------------------
   5. BUTTONS
   ------------------------------------------ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.875rem 1.75rem;
    border-radius: 0.75rem;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-gray-300);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: var(--glass-bg);
    border-color: var(--color-blue-400);
    color: var(--color-white);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* ------------------------------------------
   6. SECTION HEADERS
   ------------------------------------------ */
.section-header {
    margin-bottom: var(--space-xl);
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-blue-400);
    margin-bottom: var(--space-sm);
}

.section-tag::before {
    content: '';
    width: 1.5rem;
    height: 2px;
    background: var(--color-blue-400);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    color: var(--color-white);
}

/* ------------------------------------------
   7. NAVIGATION
   ------------------------------------------ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: var(--color-blue-400);
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-white);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: all var(--transition-base);
    transform-origin: center;
}

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

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-400);
    transition: color var(--transition-base);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

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

/* ------------------------------------------
   8. HERO SECTION
   ------------------------------------------ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--space-2xl) + 4rem) 0 var(--space-2xl);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 2rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-gray-300);
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-400);
    max-width: 480px;
    margin-bottom: var(--space-lg);
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
}

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

.stat-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1;
}

.stat-suffix {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-blue-400);
    margin-left: 2px;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
    margin-top: 0.25rem;
}

/* Hero Visual — Hologram */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hologram-container {
    position: relative;
    width: 320px;
    height: 320px;
}

.hologram-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid;
    animation: rotate 20s linear infinite;
}

.ring-1 {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border-color: rgba(96, 165, 250, 0.2);
    animation-duration: 20s;
}

.ring-2 {
    width: 75%;
    height: 75%;
    top: 12.5%;
    left: 12.5%;
    border-color: rgba(34, 211, 238, 0.15);
    animation-duration: 15s;
    animation-direction: reverse;
}

.ring-3 {
    width: 50%;
    height: 50%;
    top: 25%;
    left: 25%;
    border-color: rgba(59, 130, 246, 0.3);
    animation-duration: 10s;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.robot-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
}

.robot-svg {
    width: 100%;
    height: 100%;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.scan-line {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, transparent, var(--color-blue-400), transparent);
    opacity: 0.3;
    animation: scan 3s ease-in-out infinite;
}

@keyframes scan {
    0%, 100% { top: 0; opacity: 0; }
    50% { top: 100%; opacity: 0.5; }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-gray-500);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

.scroll-mouse {
    width: 20px;
    height: 32px;
    border: 2px solid var(--color-gray-500);
    border-radius: 10px;
    position: relative;
}

.scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--color-gray-500);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 1.5s infinite;
}

@keyframes scroll-wheel {
    0% { top: 6px; opacity: 1; }
    100% { top: 18px; opacity: 0; }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-8px); }
}

/* ------------------------------------------
   9. ABOUT SECTION
   ------------------------------------------ */
.about {
    position: relative;
    padding: var(--space-2xl) 0;
    z-index: 1;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.image-frame img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(to top, rgba(10, 15, 26, 0.9), transparent);
}

.overlay-stat {
    display: flex;
    flex-direction: column;
}

.overlay-number {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-white);
}

.overlay-label {
    font-size: 0.875rem;
    color: var(--color-gray-400);
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    box-shadow: var(--shadow-glow);
}

.card-1 {
    bottom: -1rem;
    right: -1rem;
}

.card-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 0.75rem;
    color: var(--color-white);
}

.card-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.card-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
    display: block;
}

.card-label {
    font-size: 0.75rem;
    color: var(--color-gray-400);
}

.about-lead {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

.about-text {
    color: var(--color-gray-400);
    margin-bottom: var(--space-lg);
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.feature-item {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    transition: all var(--transition-base);
}

.feature-item:hover {
    border-color: var(--color-blue-500);
    transform: translateX(4px);
}

.feature-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 0.75rem;
    color: var(--color-blue-400);
}

.feature-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.feature-info h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 0.25rem;
}

.feature-info p {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

/* ------------------------------------------
   10. SYSTEMS SECTION
   ------------------------------------------ */
.systems {
    position: relative;
    padding: var(--space-2xl) 0;
    z-index: 1;
}

.systems-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.system-card {
    position: relative;
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    overflow: hidden;
    transition: all var(--transition-base);
}

.system-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-blue-500);
    box-shadow: var(--shadow-glow);
}

.system-card.featured {
    border-color: var(--color-blue-500);
    box-shadow: 0 0 60px rgba(59, 130, 246, 0.1);
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.system-card:hover .card-glow {
    opacity: 1;
}

.card-content {
    position: relative;
    z-index: 2;
    padding: var(--space-lg);
}

.system-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-blue-400);
    margin-bottom: var(--space-sm);
}

.system-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.system-desc {
    font-size: 0.875rem;
    color: var(--color-gray-400);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.system-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    padding: 0.375rem 0.75rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--color-blue-400);
}

.system-visual {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.system-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.system-card:hover .system-visual img {
    transform: scale(1.05);
}

/* ------------------------------------------
   11. PROGRAMS SECTION
   ------------------------------------------ */
.programs {
    position: relative;
    padding: var(--space-2xl) 0;
    z-index: 1;
}

.programs-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.program-item {
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
}

.program-item:hover {
    border-color: var(--color-blue-500);
}

.program-item.active {
    border-color: var(--color-blue-500);
    box-shadow: var(--shadow-glow);
}

.program-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
}

.program-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 0.875rem;
    color: var(--color-blue-400);
    transition: all var(--transition-base);
}

.program-item:hover .program-icon,
.program-item.active .program-icon {
    background: var(--gradient-primary);
    color: var(--color-white);
}

.program-icon svg {
    width: 1.5rem;
    height: 1.5rem;
}

.program-info {
    flex: 1;
}

.program-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 0.25rem;
}

.program-duration {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

.program-arrow {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-500);
    transition: all var(--transition-base);
}

.program-item.active .program-arrow {
    transform: rotate(90deg);
    color: var(--color-blue-400);
}

.program-arrow svg {
    width: 1.25rem;
    height: 1.25rem;
}

.program-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.program-item.active .program-details {
    max-height: 400px;
}

.details-content {
    padding: 0 var(--space-lg) var(--space-lg) calc(var(--space-lg) + 4.5rem);
}

.details-content p {
    color: var(--color-gray-400);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.details-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.details-list li {
    position: relative;
    padding-left: 1.25rem;
    font-size: 0.875rem;
    color: var(--color-gray-300);
}

.details-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 6px;
    height: 6px;
    background: var(--gradient-primary);
    border-radius: 50%;
}

/* ------------------------------------------
   12. LABORATORY SECTION
   ------------------------------------------ */
.laboratory {
    position: relative;
    padding: var(--space-2xl) 0;
    z-index: 1;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.project-card {
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-blue-500);
    box-shadow: var(--shadow-glow);
}

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
}

.project-category {
    padding: 0.375rem 0.875rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 2rem;
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-blue-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-info {
    padding: var(--space-md);
}

.project-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.project-desc {
    font-size: 0.8125rem;
    color: var(--color-gray-400);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

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

.project-author {
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.project-status {
    padding: 0.25rem 0.625rem;
    border-radius: 0.375rem;
    font-size: 0.6875rem;
    font-weight: 500;
}

.project-status.completed {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.project-status.testing {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

/* ------------------------------------------
   13. CONTACTS SECTION
   ------------------------------------------ */
.contacts {
    position: relative;
    padding: var(--space-2xl) 0;
    z-index: 1;
}

.contacts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.contacts-lead {
    font-size: 1.125rem;
    color: var(--color-gray-400);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.contacts-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    transition: all var(--transition-base);
}

.contact-item:hover {
    border-color: var(--color-blue-500);
    transform: translateX(4px);
}

.contact-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 0.875rem;
    color: var(--color-blue-400);
}

.contact-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
}

.contact-label {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-white);
}

.contacts-social {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    color: var(--color-gray-400);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--color-white);
}

.social-link svg {
    width: 1.125rem;
    height: 1.125rem;
}

/* Contact Form */
.contacts-form-wrapper {
    position: sticky;
    top: 6rem;
}

.contact-form {
    position: relative;
}

.form-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    padding: var(--space-lg);
}

.form-header {
    margin-bottom: var(--space-lg);
}

.form-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 0.5rem;
}

.form-header p {
    font-size: 0.875rem;
    color: var(--color-gray-400);
}

.form-fields {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.form-group {
    position: relative;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem 1rem 1rem 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    color: var(--color-white);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-blue-500);
    background: rgba(255, 255, 255, 0.08);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: transparent;
}

.form-group label {
    position: absolute;
    left: 0.75rem;
    top: 1rem;
    font-size: 0.9375rem;
    color: var(--color-gray-500);
    pointer-events: none;
    transition: all var(--transition-base);
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
    top: -0.5rem;
    left: 0.5rem;
    font-size: 0.75rem;
    padding: 0 0.25rem;
    background: var(--color-graphite-800);
    color: var(--color-blue-400);
}

.form-group select {
    appearance: none;
    cursor: pointer;
}

.form-group select option {
    background: var(--color-graphite-800);
    color: var(--color-white);
}

/* ------------------------------------------
   14. FOOTER
   ------------------------------------------ */
.footer {
    position: relative;
    padding: var(--space-2xl) 0 var(--space-lg);
    border-top: 1px solid var(--glass-border);
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-brand .logo {
    margin-bottom: var(--space-md);
}

.footer-desc {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    line-height: 1.6;
    max-width: 280px;
}

.footer-nav h4,
.footer-contact h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-nav ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-nav a,
.footer-contact a {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    transition: color var(--transition-base);
}

.footer-nav a:hover,
.footer-contact a:hover {
    color: var(--color-blue-400);
}

.footer-contact p {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    margin-bottom: 0.75rem;
}

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

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

.footer-legal {
    display: flex;
    gap: var(--space-lg);
}

.footer-legal a {
    font-size: 0.8125rem;
    color: var(--color-gray-500);
}

/* ------------------------------------------
   15. TOAST NOTIFICATION
   ------------------------------------------ */
.toast {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    box-shadow: var(--shadow-card);
    transform: translateX(150%);
    transition: transform var(--transition-slow);
    z-index: 2000;
}

.toast.show {
    transform: translateX(0);
}

.toast-icon {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 50%;
    color: #22c55e;
    flex-shrink: 0;
}

.toast-icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.toast-content {
    display: flex;
    flex-direction: column;
}

.toast-title {
    font-weight: 600;
    color: var(--color-white);
}

.toast-message {
    font-size: 0.8125rem;
    color: var(--color-gray-400);
}

/* ------------------------------------------
   16. RESPONSIVE DESIGN
   ------------------------------------------ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .systems-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contacts-grid {
        grid-template-columns: 1fr;
    }
    
    .contacts-form-wrapper {
        position: static;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        gap: var(--space-lg);
        background: var(--color-graphite-900);
        border-left: 1px solid var(--glass-border);
        padding: var(--space-xl);
        transition: right var(--transition-base);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        font-size: 1.125rem;
    }
    
    .hamburger-line.active:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger-line.active:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger-line.active:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .details-list {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
    
    .floating-card {
        position: relative;
        bottom: auto;
        right: auto;
        margin-top: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .stat-item {
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-actions {
        flex-direction: column;
    }
}

/* ------------------------------------------
   17. ACCESSIBILITY
   ------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-blue-400);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --glass-border: rgba(255, 255, 255, 0.3);
        --color-gray-400: #ffffff;
        --color-gray-500: #cccccc;
    }
}