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

:root {
    --bg: #ffffff;
    --bg-alt: #fafafa;
    --text: #171717;
    --text-secondary: #737373;
    --border: #e5e5e5;
    --accent: #000000;
    --accent-hover: #404040;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.nav-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 600;
    font-size: 16px;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.nav-cta {
    color: var(--text) !important;
    font-weight: 500;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero */
.hero {
    padding: 160px 0 120px;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
    color: var(--text);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--accent);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
    display: inline-block;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border: 1px solid var(--border);
    transition: all 0.2s;
    display: inline-block;
}

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

/* Sections */
.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--bg-alt);
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 48px;
    letter-spacing: -0.01em;
}

/* Projects */
.projects-grid {
    display: grid;
    gap: 24px;
}

.project-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg);
    transition: all 0.2s;
}

.project-card:hover {
    border-color: var(--text);
    transform: translateY(-2px);
}

.project-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg-alt);
    padding: 4px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
}

/* Skills */
.skills-container {
    display: grid;
    gap: 32px;
}

.skill-group-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags span {
    font-size: 14px;
    color: var(--text-secondary);
    background: var(--bg-alt);
    padding: 6px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
}

/* Contact */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.contact-text {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.contact-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.contact-link {
    font-size: 16px;
    color: var(--text);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 1px solid var(--border);
    transition: border-color 0.2s;
}

.contact-link:hover {
    border-color: var(--text);
}

.contact-note {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 120px 0 80px;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
        margin-bottom: 32px;
    }

    .contact-title {
        font-size: 32px;
    }

    .nav-links a {
        font-size: 13px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 57px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s;
        pointer-events: none;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

    .nav-links a {
        font-size: 16px;
    }
}