/* ==========================================================================
   CSS Variables & Base Setup
   ========================================================================== */
   :root {
    /* Color Palette */
    --clr-bg: #030816; /* Deepest space blue */
    --clr-bg-alt: #081226; /* Deep cosmic blue */
    --clr-surface: rgba(13, 27, 62, 0.6); /* Translucent space surface */
    --clr-surface-hover: rgba(22, 43, 94, 0.8);
    --clr-text: #f3f4f6; /* Off-white for readability */
    --clr-text-muted: #9ca3af; /* Gray for secondary text */
    --clr-accent: #06b6d4; /* Cyan / Electric blue accent */
    --clr-accent-glow: rgba(6, 182, 212, 0.3);
    
    /* Typography */
    --ff-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    
    /* Layout */
    --max-width: 1280px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--ff-sans);
    background: radial-gradient(circle at 50% 0%, #0a1930 0%, var(--clr-bg) 100%);
    background-color: var(--clr-bg);
    background-attachment: fixed;
    color: var(--clr-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

body::after {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(6, 182, 212, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(6, 182, 212, 0.03) 0%, transparent 40%);
    z-index: -2;
    pointer-events: none;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
.subtitle { font-size: clamp(1.1rem, 2vw, 1.25rem); color: var(--clr-text-muted); font-weight: 400; }

/* ==========================================================================
   Layout & Utility Classes
   ========================================================================== */
.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
}

.section {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.section-padding-sm {
    padding: var(--space-lg) 0;
}

.text-center { text-align: center; }
.accent-text { color: var(--clr-accent); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--clr-accent);
    color: var(--clr-bg);
    box-shadow: 0 4px 14px var(--clr-accent-glow);
}

.btn-primary:hover {
    background-color: #0891b2;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--clr-text-muted);
    color: var(--clr-text);
}

.btn-outline:hover {
    border-color: var(--clr-accent);
    color: var(--clr-accent);
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: all var(--transition-normal);
    background: transparent;
}

.header.scrolled {
    padding: 1rem 0;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    display: flex;
    flex-direction: column;
}

.logo span {
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: -2px;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--clr-accent);
    transition: width var(--transition-normal);
}

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

.hamburger {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--clr-text);
    margin: 5px 0;
    transition: all var(--transition-fast);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px; /* Offset for header */
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.hero-content {
    max-width: 700px;
    transform: translateX(-25%);
}
@media (max-width: 992px) {
    .hero-content {
        transform: translateX(0);
        margin-top: 250px;
    }
}
.hero-title {
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    margin-bottom: 2.5rem;
    font-size: 1.25rem;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    opacity: 0.6;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-15px) translateX(-50%); }
    60% { transform: translateY(-7px) translateX(-50%); }
}

/* ==========================================================================
   Two Column Sections (About)
   ========================================================================== */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-features {
    margin-top: 2rem;
    display: grid;
    gap: 1rem;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
}

.about-features li::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--clr-accent);
    border-radius: 50%;
}

/* ==========================================================================
   Cards (Services, Why Us)
   ========================================================================== */
.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.card {
    background-color: rgba(31, 41, 55, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 2.5rem 2rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--clr-accent), transparent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    background-color: rgba(55, 65, 81, 0.5);
    border-color: rgba(6, 182, 212, 0.3);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

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

.card-icon {
    font-size: 2rem;
    color: var(--clr-accent);
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.card-text {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
}

/* ==========================================================================
   Projects (Case Studies)
   ========================================================================== */
.project-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    background-color: rgba(31, 41, 55, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 4rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-normal);
}

.project-card:hover {
    border-color: rgba(6, 182, 212, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-card:nth-child(even) {
    grid-template-columns: 1fr 1fr;
    direction: rtl; /* simple trick to swap cols if image is first */
}
.project-card:nth-child(even) > * {
    direction: ltr;
}

.project-image {
    background-color: var(--clr-surface);
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

/* Fallback gradient if no image */
.project-image.placeholder {
    background: linear-gradient(135deg, var(--clr-surface) 0%, var(--clr-bg) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}
.project-image.placeholder::after {
    content: 'Project Visual';
    color: rgba(255,255,255,0.1);
    font-size: 2rem;
    font-weight: 700;
}

.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-content {
    padding: 4rem 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-category {
    color: var(--clr-accent);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.project-tag {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--clr-text-muted);
}

/* ==========================================================================
   Technologies
   ========================================================================== */
.tech-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 3rem;
}

.tech-item {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.tech-item:hover {
    background-color: rgba(6, 182, 212, 0.1);
    border-color: rgba(6, 182, 212, 0.3);
    color: var(--clr-accent);
}

/* ==========================================================================
   Contact & CTA
   ========================================================================== */
.cta-section {
    background: linear-gradient(135deg, var(--clr-bg-alt) 0%, var(--clr-bg) 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-form {
    display: grid;
    gap: 1.5rem;
    background-color: var(--clr-surface);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 3rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--clr-text-muted);
}

.form-control {
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 4px;
    color: var(--clr-text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--clr-accent);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: rgba(3, 8, 22, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

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

.footer-links h4 {
    margin-bottom: 1.5rem;
    color: var(--clr-text);
}

.footer-links ul {
    display: grid;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--clr-text-muted);
}

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    color: var(--clr-text-muted);
    font-size: 0.85rem;
}

/* ==========================================================================
   Animations
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ==========================================================================
   Media Queries (Responsive)
   ========================================================================== */
@media (max-width: 1024px) {
    .project-card {
        grid-template-columns: 1fr;
    }
    .project-card:nth-child(even) {
        direction: ltr;
    }
    .project-image {
        min-height: 300px;
    }
}

@media (max-width: 768px) {
    .two-col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero {
        padding-top: 100px;
        text-align: center;
    }
    
    .hero-subtitle {
        margin: 0 auto 2.5rem;
    }

    .hero-cta {
        justify-content: center;
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }

    /* Mobile Menu */
    .hamburger {
        display: block;
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--clr-bg);
        border-left: 1px solid rgba(255, 255, 255, 0.05);
        flex-direction: column;
        justify-content: center;
        transition: right var(--transition-normal);
        padding: 2rem;
        z-index: 1000;
        box-shadow: -10px 0 30px rgba(0,0,0,0.5);
    }
    
    .nav-menu.active {
        right: 0;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .contact-form {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 430px) {
    :root {
        --space-xl: 4rem;
        --space-lg: 3rem;
    }
    
    .project-content {
        padding: 2rem 1.5rem;
    }
    
    .card {
        padding: 1.5rem;
    }
}

/* ==========================================================================
   Logo Slider (Marquee)
   ========================================================================== */
.logo-slider {
    overflow: hidden;
    padding: 3rem 0;
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    white-space: nowrap;
    position: relative;
}

.logo-slider::before,
.logo-slider::after {
    content: '';
    position: absolute;
    top: 0;
    width: 250px;
    height: 100%;
    z-index: 2;
}

.logo-slider::before {
    left: 0;
    background: linear-gradient(to right, var(--clr-bg), transparent);
}

.logo-slider::after {
    right: 0;
    background: linear-gradient(to left, var(--clr-bg), transparent);
}

.logo-slide-track {
    display: inline-block;
    animation: scroll 30s linear infinite;
}

.logo-slide-track:hover {
    animation-play-state: paused;
}

.logo-slide {
    display: inline-flex;
    align-items: center;
    height: 60px;
    margin: 0 40px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: color 0.3s ease;
}

.logo-slide:hover {
    color: var(--clr-accent);
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); } 
}

/* ==========================================================================
   Light Theme Classes
   ========================================================================== */
.bg-light {
    --clr-bg: #ffffff;
    --clr-bg-alt: #f8fafc;
    --clr-text: #0f172a;
    --clr-text-muted: #475569;
    --clr-border: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    background-color: var(--clr-bg);
    color: var(--clr-text);
}

.bg-light .card {
    background: #ffffff;
    border: 1px solid var(--clr-border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.bg-light .card-title {
    color: var(--clr-text);
}

.bg-light .card-text {
    color: var(--clr-text-muted);
}

.bg-light .accent-text {
    color: var(--clr-accent);
}

/* ==========================================================================
   Horizontal Carousel (Slider)
   ========================================================================== */
.carousel-slider {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 1.5rem;
    padding: 1rem 0 2rem 0;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

.carousel-slider::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.carousel-slider > .card {
    flex: 0 0 85%; /* Mobile default */
    scroll-snap-align: center;
}

@media (min-width: 768px) {
    .carousel-slider > .card {
        flex: 0 0 calc(50% - 0.75rem);
    }
}

@media (min-width: 1024px) {
    .carousel-slider > .card {
        flex: 0 0 calc(33.333% - 1rem);
    }
}