@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,300;0,400;1,300&family=Syne:wght@400;600&display=swap');

:root {
    --border:    rgba(255,255,255,0.07);
    --border-hi: rgba(255,255,255,0.16);
    --text:      #e8e8ea;
    --muted:     #6e6e73;
    --dim:       #aeaeb2;
    --accent:    #a0c4ff;
    --glow:      rgba(160,196,255,0.06);
}

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

html, body {
    height: 100%;
    background: linear-gradient(160deg, #0a0a0d 0%, #18181f 55%, #a8a8b0 100%);
    background-attachment: fixed;
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
}

body { display: flex; flex-direction: column; min-height: 100vh; }

/* ── Header ── */
header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(0,0,0,0.45);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

nav {
    display: flex; align-items: center;
    justify-content: space-between;
    padding: 0.75rem 2rem;
}

.menu { list-style: none; display: flex; gap: 1rem; }
.menu li a {
    font-size: 0.65rem; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--muted);
    text-decoration: none; transition: color 0.2s;
}
.menu li a:hover { color: var(--text); }

#language-menu {
    background: none; border: 1px solid var(--border);
    color: var(--muted); font-family: 'DM Sans', sans-serif;
    font-size: 0.65rem; letter-spacing: 0.12em;
    text-transform: uppercase; padding: 0.35rem 0.8rem;
    border-radius: 2rem; cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}
#language-menu:hover { border-color: var(--border-hi); color: var(--text); }

#language-list {
    position: absolute; top: 3rem; right: 2rem;
    background: rgba(10,10,12,0.96);
    border: 1px solid var(--border-hi);
    border-radius: 0.75rem; list-style: none;
    overflow: hidden; z-index: 200;
}
#language-list li {
    padding: 0.6rem 1.2rem; font-size: 0.7rem;
    letter-spacing: 0.08em; color: var(--muted);
    cursor: pointer; transition: background 0.15s, color 0.15s;
}
#language-list li:hover { background: rgba(255,255,255,0.05); color: var(--text); }
#language-list.hidden { display: none; }
.hidden { display: none; }

/* ── Main ── */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4rem 2rem 6rem;
    animation: fadeUp 0.7s ease both;
    gap: 3rem;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Identity block (centered, top) ── */
.identity {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
}

.portrait-wrap {
    margin-bottom: 0.6rem;
}

.portrait {
    width: 84px; height: 84px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border-hi);
    filter: grayscale(15%);
    display: block;
}

.identity h1 {
    font-family: 'DM Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1.35rem, 3.5vw, 1.9rem);
    letter-spacing: 0.08em;
    color: var(--text);
    margin-top: 0.2rem;
}

.role {
    font-family: 'DM Sans', sans-serif;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    font-weight: 400;
}

.institution {
    font-family: 'DM Sans', sans-serif;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    font-weight: 400;
    margin-top: 0.1rem;
}

.institution a {
    color: inherit;
    text-decoration: none;
    border-bottom: none;
    transition: color 0.2s;
}

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

/* ── ORCID / GitHub / Zenodo ── */
.profile-links {
    display: flex; gap: 0.6rem; align-items: center;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.72rem; letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 400;
    margin-top: 0.1rem;
}
.profile-links a {
    color: var(--muted); text-decoration: none;
    transition: color 0.2s;
}
.profile-links a:hover { color: var(--accent); }
.profile-links .sep { color: var(--border-hi); }

/* ── Two-column grid ── */
.body-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    width: 100%;
    max-width: 820px;
    border: 1px solid var(--border);
    border-radius: 1rem;
    overflow: hidden;
    background: rgba(255,255,255,0.015);
}

/* ── Bio column ── */
.bio-col {
    padding: 2rem 2rem 2rem 2rem;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    justify-content: center;
    text-align: center;
}

.bio-tags {
    font-size: 0.6rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    opacity: 0.8;
    line-height: 1.6;
}

.bio-text {
    font-size: 0.83rem;
    line-height: 1.75;
    color: var(--dim);
    font-weight: 300;
    white-space: pre-line;
}

/* ── Nav column ── */
.nav-col {
    display: flex;
    flex-direction: column;
}

.nav-col a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.15rem 1.6rem;
    font-family: 'Syne', sans-serif;
    font-weight: 400;
    font-size: 0.88rem;
    letter-spacing: 0.06em;
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: color 0.2s, background 0.2s, padding-left 0.2s;
}

.nav-col a:last-child { border-bottom: none; }

.nav-col a::after {
    content: '→';
    font-size: 0.72rem;
    color: var(--muted);
    transition: color 0.2s, transform 0.2s;
}

.nav-col a:hover {
    color: var(--accent);
    padding-left: 2rem;
    background: linear-gradient(90deg, var(--glow), transparent);
}
.nav-col a:hover::after {
    color: var(--accent);
    transform: translateX(3px);
}

/* ── Footer ── */
.site-footer {
    text-align: center; padding: 16px 0 20px;
    color: var(--accent); font-size: 0.55rem;
    letter-spacing: 0.15em; text-transform: uppercase;
    opacity: 0.8; border-top: 1px solid var(--border);
    background: rgba(0,0,0,0.1);
}
.site-footer p { font-size: 0.55rem; letter-spacing: 0.15em; margin: 0; }
.site-footer a {
    text-decoration: none; color: var(--accent);
    font-size: inherit; letter-spacing: inherit;
    text-transform: inherit; transition: opacity 0.2s;
}
.site-footer a:hover { opacity: 1; }

/* ── Responsive ── */
@media (max-width: 640px) {
    nav { padding: 0.75rem 1.25rem; }
    #language-list { right: 1.25rem; }

    .body-grid {
        grid-template-columns: 1fr;
        border-radius: 0.75rem;
    }

    .bio-col {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 1.6rem 1.4rem;
    }

    .nav-col a { padding: 1rem 1.4rem; }
    .nav-col a:hover { padding-left: 1.8rem; }
}