/* --- CSS Reset & Custom Variables --- */
:root {
    --bg-main: #0B0F19;
    --bg-surface: #161D30;
    --bg-surface-hover: #1E2942;
    --accent: #38BDF8;
    --accent-hover: #7DD3FC;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border-color: #2E3B56;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --max-width: 1140px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* --- Layout Utility Container --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Navigation Header --- */
.site-header {
    background-color: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.logo strong {
    color: var(--text-primary);
}

.logo span {
    color: var(--accent);
    font-weight: 300;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.main-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.main-nav a:hover {
    color: var(--text-primary);
}

.main-nav .btn-nav {
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 8px 16px;
    border-radius: 6px;
}

.main-nav .btn-nav:hover {
    background-color: var(--accent);
    color: var(--bg-main);
}

/* --- Hero Section --- */
.hero-section {
    padding: 140px 0 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 800px;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.25rem;
    font-weight: 400;
    margin-bottom: 40px;
}

.hero-cta-group {
    display: flex;
    gap: 16px;
}

/* --- Buttons --- */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg-main);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--bg-surface);
    border-color: var(--text-secondary);
}

/* --- Components & General Sections --- */
.section-badge {
    display: inline-block;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.about-section, .expertise-section, .contact-section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.about-section h2, .expertise-section .section-title {
    font-size: 2.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.lead-text {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 900px;
}

/* --- Grid Cards Layout --- */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.card:hover {
    background-color: var(--bg-surface-hover);
    border-color: var(--accent);
    transform: translateY(-4px);
}

.card-icon {
    font-size: 1.75rem;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 600;
}

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

/* --- Contact & Footer --- */
.contact-box {
    text-align: center;
    max-width: 700px;
}

.contact-box h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.contact-box p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.email-link {
    color: var(--accent);
    font-size: 2rem;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px dashed var(--accent);
    transition: color 0.2s ease, border-color 0.2s ease;
}

.email-link:hover {
    color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.site-footer {
    padding: 40px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-flex {
    display: flex;
    justify-content: space-between;
}

/* --- Responsive Adaptations --- */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .header-flex {
        height: auto;
        padding: 16px 0;
        flex-direction: column;
        gap: 16px;
    }
    .footer-flex {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}