/* DESIGN SYSTEM - PORTFOLIO PREMIUM */
:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --accent-cyan: #06b6d4;
    --accent-indigo: #6366f1;
    --accent-neon: #10b981;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, .font-display {
    font-family: 'Outfit', sans-serif;
    color: var(--text-primary);
    font-weight: 700;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0;
}

/* Grid System */
.grid { display: grid; gap: 2rem; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-links {
    display: none;
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
        gap: 1.5rem;
        align-items: center;
    }
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.nav-link:hover {
    color: var(--accent-cyan);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(6, 182, 212, 0.3);
}

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

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    padding: 2rem;
    transition: all 0.3s;
}

.card:hover {
    border-color: rgba(6, 182, 212, 0.3);
    transform: translateY(-5px);
}

/* Utilities */
.text-center { text-align: center; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-16 { margin-bottom: 4rem; }
.text-accent { color: var(--accent-cyan); }

.badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 1rem;
    display: block;
}

/* Mobile Menu */
#mobile-menu {
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#mobile-menu.hidden {
    display: none;
}