/* --- Variables & Reset --- */
:root {
    --primary: #4F46E5; /* Indigo */
    --primary-hover: #4338CA;
    --dark: #0F172A;
    --light: #F8FAFC;
    --gray: #64748B;
    --bg-surface: #1E293B;
    --transition: all 0.3s ease-in-out;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

body {
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
li { list-style: none; }

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-padding { padding: 100px 0; }
.bg-light { background-color: #151e2e; } /* Slightly lighter dark */

/* --- Typography & Buttons --- */
h1, h2, h3 { font-weight: 700; line-height: 1.2; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 2.5rem; margin-bottom: 15px; color: #fff; }
.section-title p { color: var(--gray); font-size: 1.1rem; }

.btn-primary, .btn-secondary, .btn-outline {
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary { background: var(--primary); color: #fff; border: none; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }
.btn-secondary { background: rgba(255,255,255,0.1); color: #fff; border: 1px solid rgba(255,255,255,0.2); }
.btn-secondary:hover { background: rgba(255,255,255,0.2); transform: translateY(-2px); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); padding: 8px 20px; }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* --- Navbar (Glassmorphism) --- */
nav {
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}
nav.scrolled {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.8rem; font-weight: 700; }
.logo span { color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a:hover { color: var(--primary); }
.hamburger { display: none; cursor: pointer; }

/* --- Hero Section --- */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    text-align: center;
    margin: 0 auto;
}
.hero h1 { font-size: 4rem; margin-bottom: 20px; background: linear-gradient(to right, #fff, #94a3b8); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 1.2rem; color: var(--gray); margin-bottom: 40px; }
.hero-buttons { display: flex; gap: 20px; justify-content: center; }
.hero-bg-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(79,70,229,0.15) 0%, rgba(15,23,42,0) 70%);
    z-index: 1;
}

/* --- Services --- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.service-card {
    background: var(--bg-surface);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition);
}
.service-card:hover { transform: translateY(-10px); border-color: var(--primary); }
.service-card .icon { font-size: 3rem; margin-bottom: 20px; }
.service-card h3 { margin-bottom: 15px; font-size: 1.5rem; }
.service-card p { color: var(--gray); }

/* --- Portfolio / Katalog --- */
.filter-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}
.filter-btn {
    background: transparent;
    color: var(--light);
    border: 1px solid var(--gray);
    padding: 8px 24px;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
}
.filter-btn.active, .filter-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}
.portfolio-item {
    background: var(--bg-surface);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    display: block; /* For JS filtering */
}
.portfolio-item:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.portfolio-img img { width: 100%; height: 250px; object-fit: cover; display: block; }
.portfolio-info { padding: 25px; }
.portfolio-info h4 { font-size: 1.25rem; margin-bottom: 5px; }
.portfolio-info p { color: var(--gray); margin-bottom: 20px; font-size: 0.9rem; }

/* --- Footer --- */
footer {
    background: #0b1120;
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}
.footer-logo h3 { font-size: 1.5rem; margin-bottom: 10px; }
.footer-logo span { color: var(--primary); }
.footer-links p { color: var(--gray); font-size: 0.9rem; margin-top: 20px; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-links { display: none; } /* Add JS toggle for mobile menu later */
    .hamburger { display: block; }
    .hero h1 { font-size: 2.5rem; }
    .hero-buttons { flex-direction: column; }
}