/* ============================================
   QuantumThread LLC — Corporate Website
   Design: Dark tech theme, blue-purple gradients
   ============================================ */

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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a28;
    --bg-card-hover: #222236;
    --text-primary: #e8e8ef;
    --text-secondary: #8888a0;
    --text-muted: #55556a;
    --accent-start: #6366f1;
    --accent-end: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --gradient: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1200px;
    --radius: 12px;
    --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; display: block; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- Typography --- */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 3.5vw, 2.8rem); letter-spacing: -0.02em; }
h3 { font-size: 1.3rem; }

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

.section-label {
    text-transform: uppercase;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--accent-start);
    margin-bottom: 12px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-hover);
}
.btn-outline:hover {
    border-color: var(--accent-start);
    color: var(--accent-start);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition);
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

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

.nav-logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.nav-logo span { color: var(--accent-start); }

.nav-links { display: flex; align-items: center; gap: 36px; list-style: none; }
.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }

.nav-cta {
    padding: 10px 24px !important;
    font-size: 0.85rem !important;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 40% 40% at 80% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin: 24px 0 40px;
    max-width: 560px;
}

.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

/* --- Sections --- */
.section { padding: 120px 0; }

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
}
.section-header p {
    color: var(--text-secondary);
    margin-top: 16px;
    font-size: 1.1rem;
}

/* --- Cards Grid --- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    justify-items: center;
}
.cards-grid.five-cols {
    grid-template-columns: repeat(3, 1fr);
}
.cards-grid.five-cols .card:nth-child(4),
.cards-grid.five-cols .card:nth-child(5) {
    max-width: 100%;
}
@media (min-width: 769px) {
    .cards-grid.five-cols {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }
    .cards-grid.five-cols .card {
        flex: 0 0 calc(33.333% - 16px);
    }
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 36px;
    transition: all var(--transition);
}
.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--accent-start);
    margin-bottom: 20px;
}

.card h3 { margin-bottom: 12px; }
.card p { color: var(--text-secondary); font-size: 0.95rem; }

/* --- Product Showcase --- */
.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 48px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.product-info h3 { font-size: 1.6rem; margin-bottom: 16px; }
.product-info p { color: var(--text-secondary); margin-bottom: 24px; }

.product-features { list-style: none; margin-bottom: 32px; }
.product-features li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
}
.product-features li::before {
    content: '✓';
    color: var(--accent-start);
    font-weight: bold;
}

.product-visual {
    background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(139,92,246,0.1));
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.product-visual i { font-size: 5rem; color: var(--accent-start); opacity: 0.6; }

/* --- Stats --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 32px;
}
.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* --- CTA Section --- */
.cta-section {
    text-align: center;
    padding: 100px 0;
    position: relative;
}
.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 50% 60% at 50% 50%, rgba(99,102,241,0.08), transparent);
}
.cta-section .container { position: relative; }
.cta-section h2 { margin-bottom: 16px; }
.cta-section p { color: var(--text-secondary); margin-bottom: 32px; font-size: 1.1rem; }

/* --- Footer --- */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 64px 0 32px;
    background: var(--bg-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand p { color: var(--text-secondary); margin-top: 12px; font-size: 0.9rem; max-width: 280px; }

.footer-col h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--text-secondary); padding: 5px 0; font-size: 0.9rem; }
.footer-col a:hover { color: var(--text-primary); }

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-social { display: flex; gap: 16px; }
.footer-social a { color: var(--text-muted); font-size: 1.1rem; }
.footer-social a:hover { color: var(--text-primary); }

/* --- Page Header (for inner pages) --- */
.page-header {
    padding: 160px 0 80px;
    text-align: center;
    position: relative;
}
.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 50% 50% at 50% 0%, rgba(99,102,241,0.08), transparent);
}
.page-header .container { position: relative; }
.page-header p { color: var(--text-secondary); margin-top: 16px; font-size: 1.1rem; max-width: 600px; margin-left: auto; margin-right: auto; }

/* --- About Page --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}
.about-text p { color: var(--text-secondary); margin-bottom: 16px; }

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.value-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    transition: all var(--transition);
}
.value-card:hover { border-color: var(--border-hover); }
.value-card i { font-size: 1.5rem; color: var(--accent-start); margin-bottom: 16px; }
.value-card h3 { margin-bottom: 8px; }
.value-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* --- Services Page --- */
.service-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    padding: 64px 0;
    border-bottom: 1px solid var(--border-color);
}
.service-detail:last-child { border-bottom: none; }
.service-detail.reverse { direction: rtl; }
.service-detail.reverse > * { direction: ltr; }
.service-detail h3 { font-size: 1.6rem; margin-bottom: 16px; }
.service-detail p { color: var(--text-secondary); margin-bottom: 16px; }

.service-visual {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 48px;
    text-align: center;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.service-visual i { font-size: 4rem; color: var(--accent-start); opacity: 0.5; }

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 64px;
}

.process-step {
    text-align: center;
    padding: 32px 20px;
}
.process-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent-glow);
    color: var(--accent-start);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    margin: 0 auto 16px;
}
.process-step h4 { margin-bottom: 8px; }
.process-step p { color: var(--text-secondary); font-size: 0.85rem; }

/* --- Contact Page --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info-list { margin-top: 32px; }
.contact-info-item {
    display: flex;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}
.contact-info-item i { font-size: 1.2rem; color: var(--accent-start); margin-top: 4px; }
.contact-info-item h4 { margin-bottom: 4px; }
.contact-info-item p { color: var(--text-secondary); font-size: 0.9rem; }

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
}
.contact-form h3 { margin-bottom: 24px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 8px; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.95rem;
    transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-start);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* --- Legal Pages --- */
.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding-bottom: 80px;
}
.legal-content h2 { font-size: 1.4rem; margin: 40px 0 16px; color: var(--text-primary); }
.legal-content h2:first-child { margin-top: 0; }
.legal-content p { color: var(--text-secondary); margin-bottom: 16px; font-size: 0.95rem; }
.legal-content ul { color: var(--text-secondary); margin: 0 0 16px 24px; font-size: 0.95rem; }
.legal-content li { margin-bottom: 8px; }
.legal-date { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 32px; }

/* --- Company Info Box --- */
.company-info-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    margin-top: 48px;
    text-align: center;
}
.company-info-box p { color: var(--text-secondary); font-size: 0.9rem; line-height: 2; }

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .product-card { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; }
    .service-detail { grid-template-columns: 1fr; }
    .service-detail.reverse { direction: ltr; }
    .contact-grid { grid-template-columns: 1fr; }
    .process-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    .nav-toggle { display: block; }

    .cards-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .values-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 12px; }
    .process-grid { grid-template-columns: 1fr; }

    .hero { min-height: auto; padding: 140px 0 80px; }
    .section { padding: 80px 0; }
    .page-header { padding: 120px 0 60px; }
}