:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-accent: #2563eb;
    --color-accent-dark: #1d4ed8;
    --color-border: #e2e8f0;
    --color-tag-bg: #eff6ff;
    --color-tag-text: #1d4ed8;
    --max-width: 900px;
    --section-gap: 6rem;
    --nav-height: 64px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    font-size: 16px;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ---- Nav ---- */

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
    height: var(--nav-height);
}

.nav--scrolled { border-color: var(--color-border); }

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-accent);
    letter-spacing: -0.02em;
}

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

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color 0.2s;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
}

/* ---- Shared section layout ---- */

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--section-gap) 1.5rem;
}

.section-title {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 2.5rem;
}

/* ---- Buttons ---- */

.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-dark); }

.btn-outline { border: 1.5px solid var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-text); }

/* ---- Hero ---- */

.hero {
    min-height: calc(100vh - var(--nav-height));
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 4rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

.hero-text { flex: 1; }

.hero-greeting {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.hero-name {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

.hero-title {
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--color-accent);
    margin-bottom: 1.25rem;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 480px;
    margin-bottom: 2rem;
    line-height: 1.75;
}

.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-image {
    flex-shrink: 0;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--color-border);
}

.hero-image img { width: 100%; height: 100%; object-fit: cover; }

/* ---- About ---- */

.about-content p {
    color: var(--color-text-muted);
    line-height: 1.85;
    margin-bottom: 1rem;
}

.about-content p:last-child { margin-bottom: 0; }

/* ---- Experience ---- */

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

.timeline { display: flex; flex-direction: column; }

.timeline-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child { border-bottom: none; }

.timeline-meta { padding-top: 2px; }

.timeline-period {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
}

.timeline-location {
    display: block;
    font-size: 0.75rem;
    color: #94a3b8;
    margin-top: 3px;
}

.timeline-company {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.timeline-role {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ---- Skills ---- */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.skill-group h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.skill-tags span {
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.3rem 0.75rem;
    border-radius: 100px;
}

/* ---- Projects ---- */

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1.5rem;
    transition: box-shadow 0.2s;
}

.project-card:hover { box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07); }

.project-card--placeholder {
    border-style: dashed;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.project-header h3 { font-size: 1rem; font-weight: 600; }

.project-status {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-status.in-progress { background: #fef9c3; color: #854d0e; }

.project-description {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.75;
    margin-bottom: 1rem;
}

.project-stack { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.project-stack span {
    font-size: 0.73rem;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.project-link {
    font-size: 0.875rem;
    color: var(--color-accent);
    font-weight: 500;
}

.project-link:hover { text-decoration: underline; }

/* ---- Footer / Contact ---- */

.footer {
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    padding: 5rem 1.5rem;
}

.footer-container h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.footer-container > p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    max-width: 400px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.75rem;
    margin-bottom: 2.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.55);
    font-size: 1.3rem;
    transition: color 0.2s;
}

.footer-links a:hover { color: #fff; }

.footer-copy {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.25);
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
    :root { --section-gap: 4rem; }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 1rem 1.5rem;
        gap: 1rem;
        align-items: flex-start;
    }

    .nav-links--open { display: flex; }
    .nav-toggle { display: flex; }

    .hero-container {
        flex-direction: column-reverse;
        text-align: center;
        padding-top: 3rem;
        padding-bottom: 3rem;
    }

    .hero-description { margin-left: auto; margin-right: auto; }
    .hero-cta { justify-content: center; }
    .hero-image { width: 140px; height: 140px; }

    .timeline-item { grid-template-columns: 1fr; gap: 0.3rem; }
    .timeline-meta { display: flex; gap: 1rem; align-items: baseline; }

    .skills-grid { grid-template-columns: 1fr; gap: 2rem; }
    .projects-grid { grid-template-columns: 1fr; }
}