:root {
    --bg-color: #fcfcfc;
    --text-main: #1a1a1a;
    --text-muted: #666666;
    --accent: #2563eb;
    --card-bg: #ffffff;
    --border-color: #eaeaea;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    transition: color 0.2s;
}

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

.hero {
    height: 70vh;
    display: flex;
    align-items: center;
    padding: 0 5%;
}

.hero-content h1 {
    font-size: 4rem;
    letter-spacing: -1.5px;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.5rem;
    color: var(--text-muted);
    max-width: 600px;
}

.portfolio-section {
    padding: 5rem 5%;
}

.section-header {
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.filter-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: all 0.2s;
}

.filter-btn.active, .filter-btn:hover {
    background: var(--text-main);
    color: var(--bg-color);
    border-color: var(--text-main);
}

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

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.8rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.badge-commercial { background: #e0f2fe; color: #0369a1; }
.badge-poc { background: #fef3c7; color: #b45309; }
.badge-pipeline { background: #f3f4f6; color: #4b5563; }

.project-info h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.project-info p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

footer {
    text-align: center;
    padding: 5rem 5%;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

footer h2 {
    margin-bottom: 1rem;
}

footer p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.contact-btn {
    display: inline-block;
    background: var(--text-main);
    color: var(--bg-color);
    text-decoration: none;
    padding: 0.8rem 2rem;
    border-radius: 4px;
    font-weight: 500;
    transition: opacity 0.2s;
}

.contact-btn:hover {
    opacity: 0.9;
}

.copyright {
    margin-top: 4rem;
    font-size: 0.85rem;
}