:root {
    --primary-color: #0f172a;
    --secondary-color: #1e293b;
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.5);
    --text-color: #e2e8f0;
    --heading-color: #f8fafc;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --container-width: 1200px;
    --spacing-unit: 1rem;
}

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

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

/* Typography */
h1, h2, h3, h4 {
    color: var(--heading-color);
    margin-bottom: 1rem;
    font-weight: 700;
}

h1 {
    font-size: 3.5rem;
    background: linear-gradient(135deg, #fff 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    border-bottom: 2px solid var(--accent-color);
    display: inline-block;
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    text-shadow: 0 0 10px var(--accent-glow);
}

/* Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

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

.lang-switch {
    border: 1px solid var(--accent-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: bold;
}

.lang-switch:hover {
    background: var(--accent-color);
    color: var(--primary-color);
    text-shadow: none;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 60px;
    background: radial-gradient(circle at center, var(--secondary-color) 0%, var(--primary-color) 70%);
}

.hero-content {
    max-width: 800px;
    animation: fadeIn 1s ease-out;
}

.tagline {
    font-size: 1.25rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    display: block;
}

/* Services / Features */
.section {
    padding: 5rem 0;
}

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

.card {
    background: var(--secondary-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.tech-tag {
    display: inline-block;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.85rem;
    margin: 0.25rem;
}

/* About */
.about-section {
    background: var(--secondary-color);
}

/* Footer */
footer {
    background: #020617;
    padding: 3rem 0;
    margin-top: 4rem;
    font-size: 0.9rem;
    color: #94a3b8;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-column h4 {
    color: #fff;
    margin-bottom: 1rem;
}

.footer-bottom {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
}

/* Utilities */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: var(--accent-color);
    color: var(--primary-color);
    border-radius: 5px;
    font-weight: 700;
    margin-top: 2rem;
    text-shadow: none;
}

.btn:hover {
    background: #7dd3fc;
    color: var(--primary-color);
    transform: scale(1.05);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .nav-links { display: none; } /* Mobile menu simplified for now */
}