/* ==========================================================================
   1. CSS Variables & Reset (Performance First)
   ========================================================================== */
:root {
    --bg-color: #f8fafc;        /* Clean Off-white for background */
    --text-main: #0f172a;       /* Deep Slate for high readability */
    --text-muted: #475569;      /* Muted text for paragraphs */
    --primary-color: #2563eb;   /* Tech/Corporate Blue */
    --primary-hover: #1d4ed8;
    --dark-accent: #020617;     /* Deep Black for Premium contrast */
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    /* Native System Fonts for Zero-Latency Loading */
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
}

/* ==========================================================================
   2. Typography & Buttons
   ========================================================================== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--dark-accent);
}

.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    font-weight: 600;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #ffffff;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--dark-accent);
    color: var(--dark-accent);
}

/* ==========================================================================
   3. Header & Navigation (Fixed & Glassmorphism)
   ========================================================================== */
.site-header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.main-nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark-accent);
    letter-spacing: -0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
}

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

.nav-links .btn-primary {
    padding: 8px 16px;
    color: #fff;
}

/* ==========================================================================
   4. Hero Section
   ========================================================================== */
.hero-section {
    max-width: 1000px;
    margin: 0 auto;
    padding: 6rem 20px 4rem;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    letter-spacing: -1px;
}

.hero-content h1 span {
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* ==========================================================================
   5. Services Grid (Core Infrastructure)
   ========================================================================== */
.services-section {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 20px;
}

.services-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--card-bg);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--text-muted);
}

/* ==========================================================================
   6. Terminal Teaser (Tools & News Split)
   ========================================================================== */
.terminal-teaser {
    background-color: var(--dark-accent);
    color: #ffffff;
    padding: 5rem 20px;
    margin-top: 5rem;
}

.split-layout {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.terminal-teaser h2 {
    color: #ffffff;
}

.terminal-teaser p {
    color: #94a3b8;
    margin-bottom: 1.5rem;
}

.link-arrow {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
}

.link-arrow:hover {
    color: #ffffff;
    transform: translateX(5px);
}

/* ==========================================================================
   7. Footer
   ========================================================================== */
.site-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 4rem 20px 2rem;
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: 1rem;
    max-width: 300px;
}

.footer-links h4, .footer-contact h4 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-links ul, .footer-contact ul {
    list-style: none;
}

.footer-links li, .footer-contact li {
    margin-bottom: 0.75rem;
}

.footer-links a, .footer-contact a {
    color: var(--text-muted);
}

.footer-links a:hover, .footer-contact a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ==========================================================================
   8. Mobile Responsiveness
   ========================================================================== */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none; /* In a real app, add a JS hamburger menu toggle here */
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .split-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}