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

:root {
    --primary: #0f62fe;
    --primary-dark: #0043ce;
    --primary-light: #d0e2ff;
    --dark: #0d1117;
    --dark-2: #161b22;
    --dark-3: #21262d;
    --gray-1: #8b949e;
    --gray-2: #c9d1d9;
    --gray-3: #f0f6fc;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #0f62fe 0%, #6929c4 100%);
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== TYPOGRAPHY ===== */
h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }

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

.section-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-header { text-align: center; max-width: 640px; margin: 0 auto 60px; }
.section-desc { color: var(--gray-1); font-size: 1.1rem; margin-top: 16px; }

.section {
    padding: 100px 0;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    border: 2px solid transparent;
    border-radius: 8px;
    padding: 10px 24px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-full { width: 100%; }

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(15,98,254,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
    background: var(--white);
    color: var(--dark);
    border-color: var(--white);
    transform: translateY(-2px);
}

.btn-nav {
    background: var(--primary);
    color: var(--white) !important;
    border-color: var(--primary);
    padding: 8px 20px;
    border-radius: 8px;
}
.btn-nav:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}
.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    padding: 12px 0;
    box-shadow: 0 1px 12px rgba(0,0,0,0.08);
}
.navbar.scrolled .logo,
.navbar.scrolled .nav-links a { color: var(--dark); }
.navbar.scrolled .nav-toggle span { background: var(--dark); }

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

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--white);
    transition: var(--transition);
}
.logo-sgl {
    font-weight: 800;
    color: var(--primary);
}
.navbar.scrolled .logo-sgl { color: var(--primary); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}
.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255,255,255,0.85);
    transition: var(--transition);
}
.nav-links a:hover { color: var(--white); }
.navbar.scrolled .nav-links a:hover { color: var(--primary); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: url('https://images.unsplash.com/photo-1558494949-ef010cbdcc31?w=1920&q=80') center/cover no-repeat;
    color: var(--white);
    overflow: hidden;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(13,17,23,0.92) 0%, rgba(13,17,23,0.75) 100%);
}
.hero-content { position: relative; z-index: 1; padding: 120px 0 80px; }
.hero-tag {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: rgba(255,255,255,0.6);
    margin-bottom: 20px;
}
.hero-sub {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.7);
    max-width: 560px;
    margin-top: 24px;
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 48px;
    margin-top: 64px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
    flex-wrap: wrap;
}
.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    font-weight: 500;
}

/* ===== ABOUT ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}
.about-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}
.about-text p {
    color: var(--gray-1);
    margin-bottom: 16px;
    font-size: 1.05rem;
}
.about-text h2 { margin-bottom: 24px; }

.about-details {
    display: flex;
    gap: 32px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid #e6e6e6;
}
.detail {
    display: flex;
    align-items: center;
    gap: 12px;
}
.detail i {
    font-size: 1.2rem;
    color: var(--primary);
}
.detail strong { display: block; font-size: 0.85rem; color: var(--dark); }
.detail span { font-size: 0.85rem; color: var(--gray-1); }

/* ===== SERVICES ===== */
.services { background: var(--gray-3); }

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.service-card {
    background: var(--white);
    padding: 36px;
    border-radius: var(--radius);
    border: 1px solid #e8e8e8;
    transition: var(--transition);
}
.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}
.service-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}
.service-icon i { font-size: 1.2rem; color: var(--primary); }
.service-card h3 { margin-bottom: 12px; }
.service-card p { color: var(--gray-1); font-size: 0.95rem; line-height: 1.7; }

/* ===== TRACK RECORD ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.case-card {
    background: var(--white);
    border: 1px solid #e8e8e8;
    border-radius: var(--radius);
    padding: 32px;
    transition: var(--transition);
}
.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}
.case-industry {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
    margin-bottom: 12px;
}
.case-industry i { margin-right: 6px; }
.case-card h3 { margin-bottom: 10px; }
.case-card p { color: var(--gray-1); font-size: 0.93rem; line-height: 1.7; }

.case-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
}
.case-tags span {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--gray-3);
    color: var(--dark-3);
}

/* ===== TECHNOLOGIES ===== */
.technologies { background: var(--gray-3); }

.tech-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}
.tech-category {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px;
    border: 1px solid #e8e8e8;
}
.tech-category h3 {
    margin-bottom: 20px;
    font-size: 1.05rem;
}
.tech-category h3 i {
    color: var(--primary);
    margin-right: 8px;
    width: 20px;
}

.tech-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.tech-pills span {
    font-size: 0.85rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--gray-3);
    color: var(--dark);
    transition: var(--transition);
}
.tech-pills span:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* ===== CTA ===== */
.cta {
    background: var(--dark);
    color: var(--white);
    text-align: center;
}
.cta-content { max-width: 640px; margin: 0 auto; }
.cta-content p { color: rgba(255,255,255,0.6); margin: 20px 0 36px; font-size: 1.1rem; }

/* ===== CONTACT ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
}
.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.contact-icon i { font-size: 1rem; color: var(--primary); }
.contact-item h4 { font-size: 0.95rem; margin-bottom: 4px; }
.contact-item p,
.contact-item a { color: var(--gray-1); font-size: 0.9rem; }
.contact-item a:hover { color: var(--primary); }

.contact-form .form-group { margin-bottom: 16px; }
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--gray-3);
}
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(15,98,254,0.1);
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.form-note { text-align: center; margin-top: 12px; font-size: 0.8rem; color: var(--gray-1); }

/* ===== FOOTER ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.5);
    padding: 48px 0 24px;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo { color: var(--white); }
.footer-brand p { font-size: 0.9rem; margin-top: 8px; }

.footer-links {
    display: flex;
    gap: 24px;
}
.footer-links a {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}
.footer-links a:hover { color: var(--white); }

.footer-bottom {
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
}

/* ===== 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: 968px) {
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-image { order: -1; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .tech-categories { grid-template-columns: 1fr; }
    .hero-stats { gap: 32px; }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: center;
        gap: 24px;
        padding: 40px;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }
    .nav-links.active { right: 0; }
    .nav-links a { color: var(--dark) !important; font-size: 1.1rem; }

    .services-grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 24px; }
    .stat-number { font-size: 1.5rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { text-align: center; }
    .footer-content { flex-direction: column; gap: 24px; text-align: center; }
    .footer-links { flex-wrap: wrap; justify-content: center; }
    .about-details { flex-direction: column; gap: 16px; }

    .section { padding: 64px 0; }
}