/* ═══════════════════════════════════════════════════════════════
   SIDHDHARTH INFO TECH — Design System v2
   Premium enterprise software company design language
   ═══════════════════════════════════════════════════════════════ */

:root {
    /* Spacing — 8px grid */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* Colors — Dark premium palette */
    --bg-void: #030304;
    --bg-base: #050508;
    --bg-elevated: #0a0a0f;
    --bg-surface: #111118;
    --bg-surface-hover: #16161f;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-strong: rgba(255, 255, 255, 0.06);

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.16);

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --text-faint: #52525b;

    --accent-blue: #3b82f6;
    --accent-cyan: #22d3ee;
    --accent-violet: #8b5cf6;
    --accent-indigo: #6366f1;

    --gradient-brand: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #22d3ee 100%);
    --gradient-text: linear-gradient(135deg, #60a5fa 0%, #a78bfa 40%, #67e8f9 100%);
    --gradient-glow: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(59, 130, 246, 0.35), transparent);
    --gradient-mesh: radial-gradient(at 20% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(at 80% 20%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
        radial-gradient(at 60% 80%, rgba(34, 211, 238, 0.08) 0%, transparent 50%);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px rgba(59, 130, 246, 0.2);
    --shadow-card: 0 0 0 1px var(--border-subtle), 0 8px 40px rgba(0, 0, 0, 0.45);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Plus Jakarta Sans', var(--font-sans);

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-7xl: 4.5rem;

    /* Layout */
    --nav-height: 72px;
    --container-max: 1280px;
    --container-wide: 1440px;

    /* Stacking — low → high (decorative layers stay below --z-nav) */
    --z-hero-glow: 0;
    --z-hero-content: 1;
    --z-hero-visual: 2;
    --z-hero-float: 3;
    --z-hero: 1;
    --z-page-local: 10;
    --z-sticky: 898;
    --z-fab: 900;
    --z-nav-drawer: 950;
    --z-nav: 1000;
    --z-dropdown: 1100;
    --z-noise: 9998;
    --z-loader: 10000;
    --z-skip-link: 10001;

    /* Motion */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 150ms;
    --duration-base: 250ms;
    --duration-slow: 500ms;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + var(--space-4));
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.sit-body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: var(--text-base);
    overflow-x: hidden;
    position: relative;
}

body.sit-body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: var(--z-noise);
    opacity: 0.028;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    mix-blend-mode: overlay;
}

body.sit-body.no-scroll {
    overflow: hidden;
    position: fixed;
    width: 100%;
    left: 0;
    right: 0;
    touch-action: none;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ─── Typography ─── */
.sit-display {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.sit-gradient-text {
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 35%, #67e8f9 70%, #60a5fa 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: sit-shimmer 8s linear infinite;
}

@keyframes sit-shimmer {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.sit-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin-bottom: var(--space-4);
}

.sit-eyebrow::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--accent-cyan);
}

.sit-section-title {
    font-family: var(--font-display);
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
    color: var(--text-primary);
}

.sit-section-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.7;
    margin-top: var(--space-4);
}

/* ─── Layout ─── */
.sit-container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.sit-container--wide { max-width: var(--container-wide); }

.sit-section {
    padding: var(--space-24) 0;
    position: relative;
}

.sit-section--divider::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(90%, 800px);
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-default), transparent);
}

/* ─── Buttons ─── */
.sit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--duration-base) var(--ease-out);
    white-space: nowrap;
}

.sit-btn--primary {
    background: var(--text-primary);
    color: var(--bg-base);
    box-shadow: 0 0 0 1px rgba(255,255,255,0.1), 0 4px 20px rgba(255,255,255,0.1);
    position: relative;
    overflow: hidden;
}

.sit-btn--primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.35) 50%, transparent 60%);
    transform: translateX(-120%);
    transition: transform 0.6s var(--ease-out);
}

.sit-btn--primary:hover::before {
    transform: translateX(120%);
}

.sit-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 0 1px rgba(255,255,255,0.2), 0 8px 32px rgba(255,255,255,0.15);
}

.sit-btn:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 3px;
}

.sit-btn:active {
    transform: translateY(0) scale(0.98);
}

.sit-btn--ghost {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    backdrop-filter: blur(12px);
}

.sit-btn--ghost:hover {
    background: var(--bg-glass-strong);
    border-color: var(--border-strong);
}

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

.sit-btn--gradient:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.sit-btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
}

.sit-btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

/* ─── Cards ─── */
.sit-glass-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.sit-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    transition: all var(--duration-base) var(--ease-out);
}

.sit-card:hover {
    border-color: var(--border-default);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

/* ─── Navigation ─── */
.sit-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    isolation: isolate;
    transform: translateZ(0);
    height: var(--nav-height);
    transition: all var(--duration-base) var(--ease-out);
    background: rgba(5, 5, 8, 0.55);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
}

.sit-nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.sit-nav--scrolled {
    background: rgba(5, 5, 8, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.sit-nav--menu-open {
    background: var(--bg-void);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.sit-logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    line-height: 0;
}

.sit-logo__frame {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #0a1628;
    line-height: 0;
    flex-shrink: 0;
}

.sit-logo__frame--nav {
    border-radius: var(--radius-sm);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
}

.sit-logo__frame--footer {
    margin-bottom: var(--space-4);
    border-radius: var(--radius-md);
}

.sit-logo__frame--loader {
    border-radius: var(--radius-lg);
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.25);
    animation: sit-pulse 1.5s ease-in-out infinite;
}

.sit-logo__frame--lg {
    border-radius: var(--radius-xl);
    box-shadow: 0 0 48px rgba(59, 130, 246, 0.2);
}

.sit-logo__img {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    object-fit: contain;
    object-position: center;
}

.sit-logo__img--nav    { width: 34px; height: 40px; }
.sit-logo__img--footer { width: 41px; height: 48px; }
.sit-logo__img--loader { width: 61px; height: 72px; }
.sit-logo__img--lg     { width: 85px; height: 100px; }

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .sit-logo__img--nav    { width: 34px; height: 40px; }
    .sit-logo__img--footer { width: 41px; height: 48px; }
    .sit-logo__img--loader { width: 61px; height: 72px; }
    .sit-logo__img--lg     { width: 85px; height: 100px; }
}

.sit-nav__mobile-brand {
    padding-bottom: var(--space-6);
    margin-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-subtle);
}

.sit-nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.sit-nav__link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--duration-fast);
    position: relative;
    padding: var(--space-1) 0;
}

.sit-nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gradient-brand);
    transition: width var(--duration-base) var(--ease-out);
}

.sit-nav__link:hover,
.sit-nav__link--active { color: var(--text-primary); }

.sit-nav__link:hover::after,
.sit-nav__link--active::after { width: 100%; }

.sit-nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sit-nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.sit-nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--duration-base);
}

.sit-nav__mobile {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg-void);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: calc(var(--nav-height) + var(--space-5)) max(var(--space-6), env(safe-area-inset-right, 0px)) max(var(--space-8), env(safe-area-inset-bottom, 0px)) max(var(--space-6), env(safe-area-inset-left, 0px));
    flex-direction: column;
    gap: var(--space-2);
    z-index: var(--z-nav-drawer);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    transition: transform var(--duration-base) var(--ease-out), opacity var(--duration-base) var(--ease-out), visibility 0s linear var(--duration-base);
}

.sit-nav__mobile.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: transform var(--duration-base) var(--ease-out), opacity var(--duration-base) var(--ease-out), visibility 0s linear 0s;
}

.sit-nav__mobile a {
    font-size: var(--text-xl);
    font-family: var(--font-display);
    font-weight: 600;
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

.sit-nav__mobile a:hover { color: var(--text-primary); }

.sit-nav__mobile a.sit-nav__link--active { color: var(--text-primary); }

.sit-nav__mobile-cta {
    margin-top: var(--space-4);
    text-align: center;
    justify-content: center;
    border-bottom: none !important;
}

.sit-footer__muted { color: var(--text-muted); }

/* Skip link — accessibility */
.sit-skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-4);
    z-index: var(--z-skip-link);
    padding: var(--space-3) var(--space-5);
    background: var(--text-primary);
    color: var(--bg-base);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: top var(--duration-fast);
}

.sit-skip-link:focus {
    top: var(--space-4);
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* Flash alert */
.sit-alert {
    padding: var(--space-4) 0;
}

.sit-alert p {
    padding: var(--space-4) var(--space-5);
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: var(--radius-lg);
    color: #4ade80;
    font-size: var(--text-sm);
    font-weight: 500;
}

/* ─── Footer ─── */
.sit-footer {
    background: var(--bg-void);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-20) 0 var(--space-8);
}

.sit-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-16);
}

.sit-footer__brand p {
    color: var(--text-muted);
    font-size: var(--text-sm);
    line-height: 1.7;
    margin-top: var(--space-4);
    max-width: 320px;
}

.sit-footer__heading {
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: var(--space-5);
}

.sit-footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.sit-footer__links a {
    font-size: var(--text-sm);
    color: var(--text-muted);
    transition: color var(--duration-fast);
}

.sit-footer__links a:hover { color: var(--text-primary); }

.sit-footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-subtle);
    font-size: var(--text-sm);
    color: var(--text-faint);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.sit-footer__legal {
    display: flex;
    gap: var(--space-6);
}

.sit-footer__legal a {
    color: var(--text-faint);
    transition: color var(--duration-fast);
}

.sit-footer__legal a:hover { color: var(--text-secondary); }

/* ─── WhatsApp FAB ─── */
.sit-whatsapp {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-fab);
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: #25d366;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 24px rgba(37, 211, 102, 0.4);
    transition: transform var(--duration-base) var(--ease-spring), bottom 0.35s var(--ease-out);
}

.sit-whatsapp:hover { transform: scale(1.08); }

/* ─── Loader ─── */
.sit-loader {
    position: fixed;
    inset: 0;
    z-index: var(--z-loader);
    background: var(--bg-void);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
}

.sit-loader.is-done {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.5s var(--ease-out), visibility 0s linear 0.5s;
}

.sit-loader__brand .sit-logo__frame--loader {
    animation: sit-pulse 1.5s ease-in-out infinite;
}

.sit-loader__bar {
    width: 120px;
    height: 2px;
    background: var(--border-subtle);
    border-radius: 2px;
    overflow: hidden;
}

.sit-loader__bar-fill {
    height: 100%;
    width: 0%;
    background: var(--gradient-brand);
    border-radius: 2px;
}

@keyframes sit-pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

/* ─── Reveal animations (GSAP fallback) ─── */
.sit-reveal {
    opacity: 0;
    transform: translateY(32px);
}

.sit-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

/* ─── Responsive ─── */
@media (max-width: 1024px) {
    .sit-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    :root { --nav-height: 64px; }

    .sit-nav__links,
    .sit-nav__actions .sit-nav__careers { display: none; }

    .page-home .sit-nav__actions .sit-nav__cta { display: none; }

    .sit-nav__toggle { display: flex; }

    .sit-nav__mobile { display: flex; }

    .sit-section { padding: var(--space-16) 0; }

    .sit-footer__grid { grid-template-columns: 1fr; gap: var(--space-8); }

    .sit-footer__bottom { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
    .sit-gradient-text { animation: none; }
}