:root {
    --color-bg: #0e0e0e;
    --color-bg-elevated: #1a1a1a;
    --color-bg-card: #2a2a2a;
    --color-text: #e8e8e8;
    --color-text-muted: #a0a0a0;
    --color-accent: #5b9aa9;
    --color-accent-hover: #6fb3c4;
    --font-display: 'JetBrains Mono', monospace;
    --font-body: 'IBM Plex Sans', sans-serif;
    --max-width: 1200px;
    --spacing-unit: 1rem;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(14, 14, 14, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(232, 232, 232, 0.05);
    transition: transform 0.3s ease;
}

nav.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

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

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s ease;
}

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

/* Sections */
section {
    padding: 8rem 0;
    min-height: auto;
}

#hero {
    padding: 12rem 0 8rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 500;
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
}

h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.tagline {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    color: var(--color-accent);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero-sub {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin-bottom: 3rem;
    line-height: 1.8;
}

/* Buttons */
.cta-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* About */
#about {
    background-color: var(--color-bg-elevated);
}

.about-content {
    max-width: 800px;
}

.about-content p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--color-text-muted);
}

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

.project-card {
    background-color: var(--color-bg-card);
    padding: 2rem;
    border: 1px solid rgba(232, 232, 232, 0.05);
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
    border-color: rgba(91, 154, 169, 0.3);
    transform: translateY(-2px);
}

.project-card h3 {
    color: var(--color-text);
}

.project-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-stack span {
    font-family: var(--font-display);
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg-elevated);
    color: var(--color-text-muted);
    border: 1px solid rgba(232, 232, 232, 0.05);
}

.project-link {
    display: inline-block;
    color: var(--color-accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s ease;
}

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

/* Contact */
#contact {
    background-color: var(--color-bg-elevated);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 600px;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-label {
    font-family: var(--font-display);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
}

.contact-item a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1.125rem;
    transition: color 0.2s ease;
}

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

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 1px solid rgba(232, 232, 232, 0.05);
}

footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .nav-container {
        padding: 1.25rem 1.5rem;
    }

    .nav-links {
        gap: 1.25rem;
    }

    .nav-links a {
        font-size: 0.85rem;
    }

    section {
        padding: 5rem 0;
    }

    #hero {
        padding: 8rem 0 5rem;
        min-height: auto;
    }

    h2 {
        margin-bottom: 2rem;
    }

    .hero-sub {
        font-size: 1rem;
    }

    .cta-group {
        flex-direction: column;
    }

    .btn {
        text-align: center;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .about-content p {
        font-size: 1rem;
    }

    .contact-info {
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .nav-logo {
        font-size: 0.9rem;
    }

    .nav-links {
        gap: 1rem;
    }
}