/* ═══════════════════════════════════════════
   Sebastian Correa-Gallego — Academic Site
   Aesthetic: contemporary academic, clean sans
   ═══════════════════════════════════════════ */

:root {
    --ink: #0f1b2d;
    --ink-soft: #1e2d3d;
    --body: #374151;
    --muted: #6b7280;
    --light: #9ca3af;
    --paper: #ffffff;
    --surface: #f8f9fb;
    --border: #e5e7eb;
    --border-light: #f0f1f3;
    --accent: #1d4ed8;
    --accent-hover: #1e40af;
    --accent-subtle: #eff3fe;
    --font: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', monospace;
    --max-width: 680px;
}

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

html {
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--paper);
    color: var(--body);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s;
}

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

/* ── Navigation ── */

nav {
    width: 100%;
    max-width: var(--max-width);
    padding: 1.8rem 1.5rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    animation: fadeIn 0.4s ease-out;
}

.nav-name {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--ink);
    text-decoration: none;
    letter-spacing: -0.02em;
}

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

.nav-links {
    display: flex;
    gap: 1.6rem;
}

.nav-links a {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--muted);
    text-decoration: none;
    letter-spacing: 0.01em;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--accent);
    transition: width 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    flex-direction: column;
    gap: 4px;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--ink);
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
}

/* ── Main ── */

main {
    max-width: var(--max-width);
    width: 100%;
    padding: 2.5rem 1.5rem 3rem;
    flex: 1;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Home hero ── */

.hero {
    display: flex;
    align-items: flex-start;
    gap: 1.8rem;
    margin-bottom: 2.6rem;
}

.hero-photo {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 3px solid var(--border-light);
}

.hero-text {
    flex: 1;
    padding-top: 0.2rem;
}

.page-home h1 {
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.025em;
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.affiliation {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--muted);
    letter-spacing: 0.01em;
    line-height: 1.5;
}

/* ── Page titles (inner pages) ── */

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.02em;
    margin-bottom: 2rem;
}

/* ── Sections ── */

section {
    margin-bottom: 2.2rem;
}

h2 {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--light);
    margin-bottom: 0.9rem;
    padding-bottom: 0.5rem;
    border-bottom: 1.5px solid var(--border);
}

p {
    font-size: 0.92rem;
    font-weight: 400;
    color: var(--body);
    line-height: 1.72;
}

p + p {
    margin-top: 0.65rem;
}

em {
    font-style: italic;
    color: var(--ink-soft);
}

/* ── Entries ── */

.entry {
    margin-bottom: 1.6rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-light);
}

.entry:last-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.15rem;
}

.entry-header h3 {
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.01em;
}

.entry-date {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--light);
    white-space: nowrap;
    font-family: var(--mono);
    letter-spacing: -0.02em;
}

.entry-role {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--muted);
    margin-bottom: 0.45rem;
}

.entry-note {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-subtle);
    padding: 0.15rem 0.55rem;
    border-radius: 3px;
    margin-top: 0.4rem;
}

/* ── Keywords / tags ── */

.keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.15rem;
}

.keyword {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.3rem 0.65rem;
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--body);
    background: var(--surface);
    letter-spacing: 0.005em;
    transition: border-color 0.15s, background 0.15s;
}

.keyword:hover {
    border-color: var(--accent);
    background: var(--accent-subtle);
    color: var(--accent);
}

/* ── Skills groups ── */

.skills-group {
    margin-bottom: 1.3rem;
}

.skills-group:last-child {
    margin-bottom: 0;
}

.skills-group h3 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--ink-soft);
    margin-bottom: 0.5rem;
    letter-spacing: -0.005em;
}

/* ── Contact links ── */

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.2rem;
}

.contact-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.35rem 0;
}

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

/* ── CV page ── */

.cv-section {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.cv-download {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--paper);
    background: var(--accent);
    padding: 0.55rem 1.15rem;
    border-radius: 6px;
    text-decoration: none;
    transition: background 0.15s, transform 0.1s;
}

.cv-download:hover {
    background: var(--accent-hover);
    color: var(--paper);
    transform: translateY(-1px);
}

.cv-embed {
    margin-top: 1.6rem;
}

.cv-embed iframe {
    width: 100%;
    height: 80vh;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
}

/* ── Publications note ── */

.publications-note {
    padding: 1rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    border-left: 3px solid var(--accent);
}

.publications-note p {
    font-size: 0.85rem;
    color: var(--muted);
}

/* ── Footer ── */

footer {
    width: 100%;
    max-width: var(--max-width);
    padding: 1.5rem;
    margin-top: auto;
}

footer p {
    font-size: 0.72rem;
    color: var(--light);
    font-weight: 400;
    border-top: 1px solid var(--border);
    padding-top: 1.2rem;
    letter-spacing: 0.01em;
}

/* ── Mobile ── */

@media (max-width: 540px) {
    html { font-size: 16px; }
    main { padding: 1.8rem 1.25rem 2.5rem; }

    .hero {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1.2rem;
    }

    .hero-photo {
        width: 100px;
        height: 100px;
    }

    .page-home h1 { font-size: 1.45rem; }
    .page-title { font-size: 1.3rem; }

    .keywords {
        justify-content: center;
    }

    .contact-links {
        justify-content: center;
    }

    .entry-header {
        flex-direction: column;
        gap: 0.05rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 3.2rem;
        right: 1.25rem;
        background: var(--paper);
        border: 1.5px solid var(--border);
        border-radius: 8px;
        flex-direction: column;
        padding: 0.7rem 1.1rem;
        gap: 0.4rem;
        box-shadow: 0 8px 24px rgba(0,0,0,0.08);
        z-index: 100;
    }

    .nav-links a::after {
        display: none;
    }

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

    .nav-toggle {
        display: flex;
    }

    nav {
        position: relative;
    }
}