:root {
    --bg-base: #050505;
    --bg-surface: #121212;
    --bg-surface-hover: #1a1a1a;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --text-primary: #f0f0f0;
    --text-secondary: #a1a1aa;
    --text-muted: #666666;
    --border-light: #222222;
    --border-focus: #333333;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --container-max: 1200px;
    --section-padding: 120px 0;
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 4rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.section-title::after {
    content: '';
    height: 1px;
    background: var(--border-light);
    flex-grow: 1;
}

#main-header {
    height: 90px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(5, 5, 5, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition-smooth);
}

#main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-primary);
}

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

#nav-menu ul {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

#nav-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

#nav-menu a:hover {
    color: var(--text-primary);
}

#nav-menu a.nav-cta {
    color: var(--accent);
    border: 1px solid var(--border-light);
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
}

#nav-menu a.nav-cta:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

#hero {
    padding: 200px 0 120px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background-color: #050505;
    background-image: 
        linear-gradient(to right, rgba(5, 5, 5, 1) 20%, rgba(5, 5, 5, 0.4) 50%, rgba(5, 5, 5, 0) 100%),
        url('../img/ilalangsetiawan.webp');
    background-position: center right;
    background-repeat: no-repeat;
    background-size: cover;
    border-bottom: 1px solid var(--border-light);
    overflow: hidden;
}

#hero::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at center, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
}

#hero .container {
    position: relative;
    z-index: 2;
}

.hero-tagline {
    display: inline-block;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 1.5rem;
}

#hero h1 {
    font-size: clamp(3rem, 7vw, 5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    max-width: 1000px;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin-bottom: 3rem;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
}

.btn-primary, .btn-secondary, .btn-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-base);
}

.btn-primary:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    transform: translateY(-3px);
}

#about {
    padding: var(--section-padding);
}

.about-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    max-width: 800px;
}

.about-text p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 800px;
    line-height: 1.8;
}

#expertise {
    padding: var(--section-padding);
    background: linear-gradient(to bottom, var(--bg-base), var(--bg-surface), var(--bg-base));
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.exp-item {
    padding: 3rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    transition: var(--transition-smooth);
}

.exp-item:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
    background: var(--bg-surface-hover);
}

.exp-icon {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
    margin-bottom: 1.5rem;
    font-family: monospace;
}

.exp-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.exp-item p {
    color: var(--text-secondary);
    font-size: 1rem;
}

#work {
    padding: var(--section-padding);
}

.project-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.project-card:hover {
    border-color: var(--accent);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.project-content {
    padding: 4rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.client-name {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.project-content h3 {
    font-size: 2rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tech-stack li {
    font-size: 0.85rem;
    color: var(--text-muted);
    border: 1px solid var(--border-light);
    padding: 0.4rem 1rem;
    border-radius: 20px;
}

.project-link {
    display: inline-flex;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--text-primary);
    align-self: flex-start;
    padding-bottom: 0.2rem;
}

.project-link:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.project-logo {
    background: #0a0a0a;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    border-left: 1px solid var(--border-light);
}

.project-logo img {
    max-width: 70%;
    filter: grayscale(1) opacity(0.5);
    transition: var(--transition-smooth);
}

.project-card:hover .project-logo img {
    filter: grayscale(0) opacity(1);
    transform: scale(1.05);
}

#contact {
    padding: var(--section-padding);
}

.contact-box {
    background: var(--bg-surface);
    padding: 6rem 3rem;
    border-radius: 16px;
    border: 1px solid var(--border-light);
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.contact-box h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.contact-box p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

.btn-cta {
    background: var(--accent);
    color: #fff;
    font-size: 1.1rem;
}

.btn-cta:hover {
    background: #fff;
    color: var(--bg-base);
    transform: translateY(-3px);
}

#main-footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border-light);
    background: var(--bg-base);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

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

.social-links a:hover {
    color: var(--text-primary);
}

@media (max-width: 992px) {
    .project-card {
        grid-template-columns: 1fr;
    }
    .project-logo {
        order: -1;
        border-left: none;
        border-bottom: 1px solid var(--border-light);
        padding: 4rem 2rem;
    }
    .project-content {
        padding: 3rem 2rem;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 80px 0;
    }
    #hero {
        padding: 150px 0 80px;
        background-image: 
            linear-gradient(to bottom, rgba(5, 5, 5, 0.7) 0%, rgba(5, 5, 5, 0.9) 100%),
            url('../img/ilalangsetiawan.webp');
        background-position: center top;
        text-align: center;
    }
    .hero-cta {
        flex-direction: column;
    }
    .hero-cta a {
        width: 100%;
    }
    #nav-menu {
        display: none;
    }
    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}