/* RGS Design System 
   Premium B2B Tech Theme
*/

:root {
    /* Color Palette */
    --primary-bg: #000000;
    /* Pure Black */
    --secondary-bg: #111111;
    /* Dark Gray */
    --accent: #E50914;
    /* Vibrant Red */
    --accent-hover: #b20710;
    /* Deep Red */
    --text-main: #f3f4f6;
    /* Off-white */
    --text-muted: #9ca3af;
    /* Gray */
    --border-color: #333333;

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --container-width: 1200px;
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--primary-bg);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Typography Utility */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: white;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.text-gradient {
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Nav */
header {
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: white;
    letter-spacing: -1px;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    font-weight: 500;
    position: relative;
    font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.btn-primary {
    background: var(--accent);
    color: white;
    padding: 0.75rem 1.75rem;
    border-radius: 4px;
    font-weight: 600;
    display: inline-block;
    border: 1px solid var(--accent);
    transition: all 0.3s;
}

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

.btn-outline {
    background: transparent;
    color: white;
    padding: 0.75rem 1.75rem;
    border-radius: 4px;
    font-weight: 600;
    display: inline-block;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

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

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: white;
    border-radius: 3px;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    padding-top: calc(var(--header-height) + 80px);
    padding-bottom: 100px;
    background: radial-gradient(circle at 50% 50%, #200505 0%, var(--primary-bg) 70%);
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    /* Abstract grid or circuit pattern if possible with CSS */
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 10;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 100%;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

/* Cards (Services) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 30px;
}

.card {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 8px;
    transition: transform 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.card-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.card p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Footer */
footer {
    background: var(--secondary-bg);
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

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

.footer-col h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-col ul li {
    margin-bottom: 0.8rem;
}

.footer-col ul li a {
    color: var(--text-muted);
}

.footer-col ul li a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--secondary-bg);
        flex-direction: column;
        padding: 2.5rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}