/* home.css - v3 (Futuristic & Stunning Navbar) */

/* --- "Sentient Stripe" Header --- */
.site-header.sentient-stripe {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 2000; /* Highest z-index */
    padding: calc(var(--spacing-unit) * 1.5) 0; /* 12px, very slender */
    background: transparent; /* Initially transparent */
    transition: background-color var(--transition-duration-normal) var(--transition-timing-function-cubic),
                backdrop-filter var(--transition-duration-normal) var(--transition-timing-function-cubic),
                padding var(--transition-duration-normal) var(--transition-timing-function-cubic);
}
.site-header.sentient-stripe.scrolled,
.site-header.sentient-stripe.nav-open { /* Apply style when nav is open too */
    background-color: rgba(3, 4, 9, 0.65); /* var(--primary-bg-color) with opacity */
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    padding: calc(var(--spacing-unit) * 1.25) 0; /* 10px, even more slender when scrolled */
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.05);
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Futuristic Logo */
.logo-futuristic .logo-svg {
    width: calc(var(--spacing-unit) * 4.5); /* 36px */
    height: calc(var(--spacing-unit) * 4.5);
    transition: transform var(--transition-duration-normal) var(--transition-timing-function-cubic),
                filter var(--transition-duration-normal) var(--transition-timing-function-cubic);
}
.logo-futuristic .logo-svg:hover {
    transform: rotate(15deg) scale(1.1);
    filter: drop-shadow(0 0 10px var(--accent-glow-color));
}

/* Futuristic Navigation (Desktop) */
.futuristic-nav {
    display: flex; /* Hidden on mobile by default, shown via media query */
}
.nav-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 0.5); /* Minimal gap */
}
.nav-item { /* Common class for links and CTA for alignment */
    opacity: 0; /* Initially hidden */
    transform: translateY(-10px);
    animation: fadeInNavItems var(--transition-duration-slow) var(--transition-timing-function-cubic) forwards;
}
/* Staggered animation for nav items - requires JS to add these delays or individual CSS */
.nav-item:nth-child(1) { animation-delay: 0.3s; }
.nav-item:nth-child(2) { animation-delay: 0.4s; }
.nav-item:nth-child(3) { animation-delay: 0.5s; }
.header-cta.nav-item { animation-delay: 0.6s; } /* For the CTA button */

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

.nav-link {
    color: var(--secondary-text-color);
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: var(--font-weight-light);
    font-size: var(--font-size-sm); /* 14px */
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2); /* 8px 16px */
    position: relative;
    letter-spacing: 0.05em;
    text-transform: uppercase; /* For a more "coded" feel */
    transition: color var(--transition-duration-fast) var(--transition-timing-function-cubic);
}
.nav-link span { /* Number prefix */
    color: var(--accent-secondary-color);
    margin-right: calc(var(--spacing-unit) * 0.5);
    font-size: 0.8em;
    opacity: 0.7;
}
.nav-link::after { /* Illuminated line effect */
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1.5px;
    background: linear-gradient(90deg, var(--accent-primary-color), var(--accent-secondary-color));
    border-radius: 1px;
    transition: width var(--transition-duration-normal) var(--transition-timing-function-expo);
    box-shadow: 0 0 8px var(--accent-glow-color);
}
.nav-link:hover, .nav-link.active {
    color: var(--primary-text-color);
}
.nav-link:hover::after, .nav-link.active::after {
    width: calc(100% - var(--spacing-unit) * 2); /* Adjust width to text */
}

.header-cta {
    padding: calc(var(--spacing-unit) * 1.1) calc(var(--spacing-unit) * 2.5); /* ~9px 20px */
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--primary-bg-color); /* Dark text for contrast */
}
.header-cta span { color: inherit; } /* Override prefix color for CTA */


/* Futuristic Mobile Toggle */
.mobile-nav-toggle.futuristic-toggle {
    display: none; /* Shown via media query */
    background: transparent;
    border: none;
    color: var(--primary-text-color);
    cursor: pointer;
    padding: var(--spacing-unit);
    z-index: 2002; /* Above nav items, below overlay */
    position: relative; /* Needed for absolute positioning of icons inside */
    width: 40px;
    height: 40px;
}
.futuristic-toggle .toggle-icon {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 24px; height: 24px;
    transition: opacity var(--transition-duration-fast), transform var(--transition-duration-fast);
}
.futuristic-toggle .toggle-icon.close { opacity: 0; transform: translate(-50%, -50%) rotate(-45deg); }

.mobile-nav-open .futuristic-toggle .toggle-icon.open { opacity: 0; transform: translate(-50%, -50%) rotate(45deg); }
.mobile-nav-open .futuristic-toggle .toggle-icon.close { opacity: 1; transform: translate(-50%, -50%) rotate(0deg); }

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(3, 4, 9, 0.9); /* Dark, highly transparent */
    backdrop-filter: blur(25px) saturate(200%);
    -webkit-backdrop-filter: blur(25px) saturate(200%);
    z-index: 1999; /* Below header toggle, above content */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px); /* Subtle entry animation */
    transition: opacity var(--transition-duration-normal) var(--transition-timing-function-cubic),
                visibility var(--transition-duration-normal) var(--transition-timing-function-cubic),
                transform var(--transition-duration-normal) var(--transition-timing-function-cubic);
}
.mobile-menu-overlay.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.mobile-nav ul { list-style: none; text-align: center; }
.mobile-nav li { margin-bottom: calc(var(--spacing-unit) * 3); }
.mobile-nav-link {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    font-weight: var(--font-weight-medium);
    color: var(--primary-text-color);
    text-decoration: none;
    letter-spacing: 0.02em;
    opacity: 0;
    transform: translateY(15px);
    display: block; /* For animation */
    transition: color var(--transition-duration-fast);
}
.mobile-menu-overlay.open .mobile-nav-link { /* Staggered animation for links */
    animation: slideInLink 0.5s var(--transition-timing-function-cubic) forwards;
}
.mobile-nav-link span { color: var(--accent-primary-color); opacity: 0.8; margin-right: var(--spacing-unit); }
.mobile-nav-link:hover, .mobile-nav-link:focus { color: var(--accent-primary-hover); }

.mobile-nav-link.cta {
    margin-top: calc(var(--spacing-unit) * 5);
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 4);
    border: 1.5px solid var(--accent-primary-color);
    border-radius: var(--border-radius-md);
    font-size: clamp(1.5rem, 4vw, 2rem);
    background: transparent;
}
.mobile-nav-link.cta:hover {
    background: var(--accent-primary-color);
    color: var(--primary-bg-color);
}
/* Staggered animation delays for mobile links (can be done with JS or more CSS) */
.mobile-menu-overlay.open .mobile-nav li:nth-child(1) .mobile-nav-link { animation-delay: 0.2s; }
.mobile-menu-overlay.open .mobile-nav li:nth-child(2) .mobile-nav-link { animation-delay: 0.3s; }
.mobile-menu-overlay.open .mobile-nav li:nth-child(3) .mobile-nav-link { animation-delay: 0.4s; }
.mobile-menu-overlay.open .mobile-nav li:nth-child(4) .mobile-nav-link { animation-delay: 0.5s; }

@keyframes slideInLink {
    to { opacity: 1; transform: translateY(0); }
}
.overlay-diag-bg { /* Decorative background element */
    position: absolute;
    bottom: -20%; right: -20%;
    width: 70%; height: 70%;
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.02), rgba(189, 0, 255, 0.03));
    transform: rotate(-30deg);
    z-index: -1;
    border-radius: 50%;
    filter: blur(50px);
    opacity: 0;
    transition: opacity 0.8s ease-out 0.3s;
}
.mobile-menu-overlay.open .overlay-diag-bg { opacity: 1; }


/* --- Hero Section - Futuristic & Immersive --- */
.futuristic-hero {
    min-height: 100vh;
    max-height: 1200px; /* Cap height for very tall screens */
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: calc(var(--spacing-unit) * 20); /* Generous padding */
    padding-bottom: calc(var(--spacing-unit) * 15);
    position: relative;
    overflow: hidden;
    text-align: center;
    background: var(--primary-bg-color); /* Fallback */
    /* More advanced background:
    background: radial-gradient(ellipse at center, var(--secondary-bg-color) 0%, var(--primary-bg-color) 70%);
    */
}
.hero-background-elements { /* Container for JS particles or CSS animations */
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none; /* Allow clicks through */
}
/* Example CSS particles - very basic, JS would be better */
.particle {
    position: absolute;
    border-radius: 50%;
    background: var(--accent-primary-color);
    opacity: 0;
    animation: floatParticle 20s infinite ease-in-out;
}
.particle-1 { width: 3px; height: 3px; top: 20%; left: 10%; animation-delay: 0s; opacity: 0.3; }
.particle-2 { width: 2px; height: 2px; top: 70%; left: 80%; animation-delay: -5s; opacity: 0.2; background: var(--accent-secondary-color); }
.particle-3 { width: 4px; height: 4px; top: 50%; left: 50%; animation-delay: -10s; opacity: 0.4; }

@keyframes floatParticle {
    0% { transform: translate(0, 0) scale(1); opacity: 0.1; }
    25% { opacity: 0.6; }
    50% { transform: translate(20px, -30px) scale(1.2); opacity: 0.3; }
    75% { opacity: 0.5; }
    100% { transform: translate(0, 0) scale(1); opacity: 0.1; }
}

.hero-container { position: relative; z-index: 1; }
.hero-content { max-width: 900px; margin: 0 auto; }

.hero-headline {
    color: var(--primary-text-color);
    line-height: 1.1;
    margin-bottom: calc(var(--spacing-unit) * 4); /* 32px */
    text-shadow: 0 0 25px rgba(232, 233, 240, 0.15);
}
.hero-subheadline {
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: calc(var(--spacing-unit) * 6); /* 48px */
    color: var(--secondary-text-color);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extralight);
    letter-spacing: 0.02em;
}
.hero-cta-group { display: flex; justify-content: center; gap: calc(var(--spacing-unit) * 3); flex-wrap: wrap; }
.hero-cta.primary-action { font-size: var(--font-size-lg); }
.hero-cta.secondary { font-size: var(--font-size-lg); }

.futuristic-scroll {
    position: absolute;
    bottom: calc(var(--spacing-unit) * 5); /* 40px */
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent-secondary-color);
    z-index: 5;
    opacity: 0.6;
    cursor: pointer;
    transition: opacity var(--transition-duration-fast), color var(--transition-duration-fast);
}
.futuristic-scroll:hover { color: var(--accent-primary-color); opacity: 1; }
.futuristic-scroll .scroll-dot { animation: scrollPulse 1.5s infinite ease-in-out alternate; }
@keyframes scrollPulse {
    from { transform: translateY(0px); opacity: 1; }
    to { transform: translateY(10px); opacity: 0.3; }
}


/* --- About Section - Futuristic Grid & Philosophies --- */
.about-grid-futuristic {
    display: grid;
    grid-template-columns: 1.2fr 1fr; /* Text slightly more prominent */
    gap: calc(var(--spacing-unit) * 10);
    align-items: center;
    margin-bottom: calc(var(--spacing-unit) * 10);
}
.section-subtitle-alt { /* Used in About section */
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-medium);
    color: var(--primary-text-color);
    margin-bottom: calc(var(--spacing-unit) * 3);
    letter-spacing: -0.01em;
}
.about-text-content p {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-light);
}
.about-visual-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}
.abstract-visual img {
    max-width: 450px;
    width: 100%;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 0 50px rgba(0, 242, 254, 0.1), 0 0 30px rgba(189, 0, 255, 0.08);
    object-fit: cover;
    opacity: 0.85;
    transition: opacity var(--transition-duration-normal), transform var(--transition-duration-normal);
}
.abstract-visual img:hover {
    opacity: 1;
    transform: scale(1.03);
}

.core-philosophies {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 5);
    margin-top: calc(var(--spacing-unit) * 8);
}
.philosophy-item {
    background-color: var(--card-bg-color);
    padding: calc(var(--spacing-unit) * 4);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: transform var(--transition-duration-normal) var(--transition-timing-function-cubic),
                box-shadow var(--transition-duration-normal) var(--transition-timing-function-cubic);
}
.philosophy-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2), 0 0 20px var(--accent-glow-color);
}
.philosophy-icon {
    margin-bottom: calc(var(--spacing-unit) * 2.5);
    color: var(--accent-primary-color);
}
.philosophy-icon svg { width: 40px; height: 40px; margin: 0 auto; }
.philosophy-item h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    color: var(--primary-text-color);
    margin-bottom: var(--spacing-unit);
}
.philosophy-item p {
    font-size: var(--font-size-md);
    color: var(--secondary-text-color);
    font-weight: var(--font-weight-light);
}


/* --- Services Section - Flow Diagram Style --- */
.services-flow-diagram {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 5);
    position: relative; /* For connecting lines if added */
    margin-top: calc(var(--spacing-unit) * 6);
}
.flow-step {
    background-color: var(--card-bg-color);
    padding: calc(var(--spacing-unit) * 3.5);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    position: relative; /* For step number */
    overflow: hidden; /* For animated borders or glows */
    transition: transform var(--transition-duration-normal) var(--transition-timing-function-cubic),
                box-shadow var(--transition-duration-normal) var(--transition-timing-function-cubic);
}
.flow-step:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 0 30px var(--accent-glow-color), 0 5px 15px rgba(0,0,0,0.2);
}
.flow-step::before { /* Subtle animated border accent */
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 0%; height: 2px;
    background: var(--accent-primary-color);
    transition: width var(--transition-duration-slow) var(--transition-timing-function-expo);
    box-shadow: 0 0 8px var(--accent-glow-color);
}
.flow-step:hover::before { width: 100%; }

.flow-step-number {
    position: absolute;
    top: calc(var(--spacing-unit) * 2);
    right: calc(var(--spacing-unit) * 2.5);
    font-size: 2.5rem;
    font-family: var(--font-display);
    font-weight: var(--font-weight-bold);
    color: var(--accent-secondary-color);
    opacity: 0.1;
    line-height: 1;
}
.flow-step-icon {
    margin-bottom: calc(var(--spacing-unit) * 2);
    color: var(--accent-primary-color);
}
.flow-step-icon svg { width: 36px; height: 36px; }
.flow-step h3 {
    font-size: 1.4rem; /* Slightly larger for step titles */
    font-weight: var(--font-weight-medium);
    color: var(--primary-text-color);
    margin-bottom: var(--spacing-unit) * 1.5;
}
.flow-step p {
    font-size: var(--font-size-md);
    color: var(--secondary-text-color);
    font-weight: var(--font-weight-light);
}

/* --- Portfolio Section - Futuristic Grid --- */
.portfolio-grid-futuristic {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: calc(var(--spacing-unit) * 6); /* Increased gap */
}
.portfolio-item-futuristic {
    display: block;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    text-decoration: none;
    border: 1px solid var(--border-color);
    transition: all var(--transition-duration-normal) var(--transition-timing-function-cubic);
    position: relative;
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}
.portfolio-item-futuristic:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0,0,0,0.25), 0 0 30px var(--accent-glow-color);
    border-color: var(--border-highlight-color);
}
.portfolio-image-wrapper {
    aspect-ratio: 16 / 9.5; /* Cinematic aspect ratio */
    overflow: hidden;
    background-color: var(--secondary-bg-color);
    position: relative; /* For tech stack overlay */
}
.portfolio-item-futuristic img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--transition-timing-function-expo), opacity 0.6s ease;
    opacity: 0.9;
}
.portfolio-item-futuristic:hover img {
    transform: scale(1.08);
    opacity: 1;
}
.portfolio-item-tech-stack {
    position: absolute;
    bottom: var(--spacing-unit);
    left: var(--spacing-unit);
    display: flex;
    gap: var(--spacing-unit);
    z-index: 1;
}
.portfolio-item-tech-stack span {
    background-color: rgba(3, 4, 9, 0.7);
    backdrop-filter: blur(5px);
    color: var(--accent-primary-color);
    padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.portfolio-item-info {
    padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 3.5);
}
.portfolio-item-info h3 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary-text-color);
    margin-bottom: var(--spacing-unit) * 0.75;
}
.portfolio-item-info p {
    font-size: var(--font-size-md);
    color: var(--secondary-text-color);
    margin-bottom: var(--spacing-unit) * 2;
    font-weight: var(--font-weight-light);
}
.view-case-study {
    display: inline-flex;
    align-items: center;
    color: var(--accent-primary-color);
    font-family: var(--font-display);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.03em;
    transition: color var(--transition-duration-fast);
}
.view-case-study .arrow-icon {
    width: 20px; height: 20px;
    stroke: currentColor; stroke-width: 1.5; fill: none;
    stroke-linecap: round; stroke-linejoin: round;
    margin-left: var(--spacing-unit);
    transition: transform var(--transition-duration-fast) var(--transition-timing-function-cubic);
}
.portfolio-item-futuristic:hover .view-case-study {
    color: var(--accent-primary-hover);
}
.portfolio-item-futuristic:hover .view-case-study .arrow-icon {
    transform: translateX(5px);
}

.portfolio-cta { text-align: center; margin-top: calc(var(--spacing-unit) * 10); }

/* --- Contact Section - Futuristic Grid --- */
.contact-grid-futuristic {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: calc(var(--spacing-unit) * 8);
    align-items: flex-start;
    margin-top: calc(var(--spacing-unit) * 6);
}
.contact-form-futuristic .form-group input,
.contact-form-futuristic .form-group textarea {
    font-size: var(--font-size-md); /* Ensure consistent font size */
}
.contact-form-wrapper .cta-button { width: 100%; }
.contact-form-wrapper .cta-button span { color: var(--primary-bg-color); } /* Explicit dark text for CTA */

.contact-info-wrapper h3 {
    font-size: var(--font-size-h4);
    color: var(--primary-text-color);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-unit) * 1.5;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.contact-link-futuristic {
    font-family: var(--font-display);
    font-size: var(--font-size-lg);
    color: var(--secondary-text-color);
    word-break: break-all;
}
.contact-link-futuristic:hover { color: var(--accent-primary-color); }
.mt-large { margin-top: calc(var(--spacing-unit) * 5); }

.social-links-futuristic {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-unit);
}
.social-links-futuristic li { margin-bottom: var(--spacing-unit) * 1.5; }
.social-links-futuristic li a {
    display: inline-flex;
    align-items: center;
    color: var(--secondary-text-color);
    font-family: var(--font-display);
    font-weight: var(--font-weight-light);
    letter-spacing: 0.05em;
    transition: color var(--transition-duration-fast), padding-left var(--transition-duration-fast);
}
.social-links-futuristic li a:hover {
    color: var(--accent-primary-color);
    padding-left: var(--spacing-unit);
}
.social-links-futuristic li a span:first-child { /* The "//" */
    color: var(--accent-secondary-color);
    opacity: 0.5;
    margin-right: var(--spacing-unit);
}
.social-links-futuristic li a .link-arrow {
    margin-left: auto; /* Pushes arrow to the right if needed, or control spacing */
    opacity: 0;
    transition: opacity var(--transition-duration-fast);
}
.social-links-futuristic li a:hover .link-arrow { opacity: 1; }
.availability-status {
    margin-top: calc(var(--spacing-unit) * 4);
    font-family: var(--font-display);
    font-size: var(--font-size-sm);
    color: var(--accent-primary-color);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    opacity: 0.8;
}

/* --- Footer - Futuristic & Minimal --- */
.site-footer-futuristic {
    text-align: center;
    padding: calc(var(--spacing-unit) * 6) 0;
    background-color: var(--secondary-bg-color); /* Slightly different from main bg */
    border-top: 1px solid var(--border-color);
}
.site-footer-futuristic .footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-unit);
}
.site-footer-futuristic .copyright,
.site-footer-futuristic .ethos {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--secondary-text-color);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    opacity: 0.7;
}
.site-footer-futuristic .ethos { color: var(--accent-primary-color); opacity: 0.9; }

/* --- Back to Top Button - Futuristic --- */
.back-to-top-futuristic {
    position: fixed;
    bottom: calc(var(--spacing-unit) * 3.5); /* 28px */
    right: calc(var(--spacing-unit) * 3.5);
    background-color: rgba(15, 16, 26, 0.7); /* var(--card-bg-color) with opacity */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--secondary-text-color);
    width: calc(var(--spacing-unit) * 6); /* 48px */
    height: calc(var(--spacing-unit) * 6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8) translateY(20px);
    transition: all var(--transition-duration-normal) var(--transition-timing-function-cubic);
    z-index: 1500;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}
.back-to-top-futuristic.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
}
.back-to-top-futuristic:hover {
    background-color: var(--accent-primary-color);
    color: var(--primary-bg-color);
    border-color: var(--accent-primary-color);
    transform: scale(1.1) translateY(-3px);
    box-shadow: 0 0 25px var(--accent-glow-color);
}
.back-to-top-futuristic svg { width: 24px; height: 24px; }

/* --- Responsive Overrides for Futuristic Design --- */
@media (max-width: 992px) { /* Adjust breakpoint for nav changes */
    .futuristic-nav, .header-cta.nav-item { display: none; } /* Hide desktop nav items */
    .mobile-nav-toggle.futuristic-toggle { display: flex; align-items: center; justify-content: center; }
    .about-grid-futuristic { grid-template-columns: 1fr; gap: var(--spacing-unit) * 6; }
    .about-visual-wrapper { order: -1; margin-bottom: var(--spacing-unit) * 4; } /* Image on top */
    .about-text-content { text-align: center; }
    .core-philosophies { gap: var(--spacing-unit) * 3; }
    .contact-grid-futuristic { grid-template-columns: 1fr; gap: var(--spacing-unit) * 6; }
    .contact-info-wrapper { text-align: center; }
    .social-links-futuristic { justify-content: center; }
}

@media (max-width: 767px) { /* Mobile */
    .services-flow-diagram { gap: var(--spacing-unit) * 3; }
    .flow-step { padding: calc(var(--spacing-unit) * 3); }
    .flow-step h3 { font-size: 1.3rem; }
    .portfolio-grid-futuristic { gap: var(--spacing-unit) * 4; }
    .portfolio-item-info h3 { font-size: 1.3rem; }
    .contact-form-futuristic .form-row { grid-template-columns: 1fr; } /* Stack name/email in contact */
}