/* ===== CSS Reset & Variables ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --sidebar-width: 270px;
    --color-bg: #ffffff;
    --color-surface: #f6f8fa;
    --color-border: #d0d7de;
    --color-text: #1f2328;
    --color-text-muted: #656d76;
    --color-accent: #0969da;
    --color-accent-hover: #0550ae;
    --color-tag-bg: #ddf4ff;
    --color-tag-text: #0550ae;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    --radius: 6px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --transition: 150ms ease;

    /* Sidebar dark theme */
    --sidebar-bg: #161b22;
    --sidebar-text: #e6edf3;
    --sidebar-text-muted: #8b949e;
    --sidebar-border: #30363d;
    --sidebar-hover-bg: #21262d;
    --sidebar-accent: #58a6ff;
}

/* ===== Base ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--sidebar-bg); /* fills the sidebar column at full height */
    min-height: 100vh;
}

strong {
    font-weight: 600;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* ===== Layout ===== */
.page-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: stretch;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--sidebar-bg);
    padding: 32px 20px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar-avatar-wrap {
    position: relative;
    margin-bottom: 16px;
}

.sidebar-avatar {
    width: 100%;
    border-radius: 12px;
    border: 2px solid var(--sidebar-border);
    display: block;
    margin: 0;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    object-position: center top;
}

.sidebar-avatar-badge {
    position: absolute;
    bottom: -6px;
    right: -6px;
    width: 32px;
    height: 32px;
    background: var(--sidebar-bg);
    border: 2px solid var(--sidebar-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    line-height: 1;
    user-select: none;
}

.sidebar-name {
    font-size: 20px;
    font-weight: 600;
    color: var(--sidebar-text);
    line-height: 1.25;
    margin-bottom: 4px;
}

.sidebar-position {
    font-size: 13px;
    font-weight: 600;
    color: var(--sidebar-text);
    margin-bottom: 4px;
    line-height: 1.4;
}

.sidebar-affiliation {
    font-size: 12px;
    color: var(--sidebar-text-muted);
    margin-bottom: 16px;
    line-height: 1.5;
}

.sidebar-divider {
    border: none;
    border-top: 1px solid var(--sidebar-border);
    margin: 16px 0;
}

.sidebar-meta {
    list-style: none;
    margin-bottom: 16px;
}

.sidebar-meta li {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--sidebar-text-muted);
    padding: 1px 0;
}

.sidebar-meta li i {
    width: 16px;
    text-align: center;
    font-size: 14px;
    flex-shrink: 0;
    color: var(--sidebar-text-muted);
}

.sidebar-meta li a {
    color: var(--sidebar-text-muted);
}

.sidebar-meta li a:hover {
    color: var(--sidebar-accent);
}

.sidebar-links {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: auto;
    padding-top: 16px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 3px 6px;
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--sidebar-text-muted);
    transition: color var(--transition), background var(--transition);
    text-decoration: none;
}

.sidebar-link:hover {
    color: var(--sidebar-accent);
    background: var(--sidebar-hover-bg);
    text-decoration: none;
}

.sidebar-link svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    stroke: currentColor;
}

.sidebar-link-icon {
    font-size: 14px;
    width: 14px;
    text-align: center;
    flex-shrink: 0;
    line-height: 1;
}

/* ===== Nav Tabs (sticky) ===== */
.nav-tabs-wrapper {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 12px;
    margin-left: -40px;
    margin-right: -40px;
    padding: 0 40px;
}

.nav-tabs {
    display: flex;
    gap: 0;
    list-style: none;
    overflow-x: auto;
}

.nav-tabs li a {
    display: block;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
    white-space: nowrap;
}

.nav-tabs li a:hover {
    color: var(--color-text);
    text-decoration: none;
    border-bottom-color: var(--color-border);
}

.nav-tabs li a.active,
.nav-tabs li a:focus {
    color: var(--color-text);
    border-bottom-color: #fd8c73;
    font-weight: 600;
}

/* ===== Main content ===== */
.main-content {
    flex: 1;
    min-width: 0;
    background: var(--color-bg);
    padding: 0 40px 48px;
}

/* ===== Section headings ===== */
.section-anchor {
    padding-top: 72px; /* offset for sticky nav */
    margin-top: -56px;
}

.section-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 12px;
}

/* ===== About section ===== */
#about .about-text p {
    margin-bottom: 8px;
    font-size: 15px;
    color: var(--color-text);
}

/* ===== Research section ===== */
.research-block {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 14px 18px;
    margin-bottom: 12px;
    background: var(--color-bg);
    transition: box-shadow var(--transition), border-color var(--transition);
}

.research-block:hover {
    box-shadow: var(--shadow-sm);
    border-color: #b0b8c2;
}

.research-block-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.research-block-body {
    font-size: 14px;
    color: #444c56;
    line-height: 1.5;
}

.research-block-body p + p {
    margin-top: 6px;
}

.research-block-body img {
    border-radius: var(--radius);
    margin: 12px 0 4px 0;
}

.research-block-body img.img-right {
    float: right;
    margin-left: 16px;
    margin-bottom: 8px;
    max-width: 350px;
}

.research-block-body img.img-left {
    float: left;
    margin-right: 16px;
    margin-bottom: 8px;
    max-width: 350px;
}

.research-block-body img.img-center {
    display: block;
    float: none;
    margin: 12px auto;
    max-width: 100%;
}

.research-block-body::after {
    content: "";
    display: table;
    clear: both;
}

.figure-credit {
    font-size: 12px;
    color: var(--color-text-muted);
    font-style: italic;
    display: block;
    margin-top: 4px;
}

/* ===== CV / Vitae section ===== */
.cv-section {
    margin-bottom: 8px;
}

.cv-group-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: 4px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--color-border);
}

.cv-entry {
    display: flex;
    gap: 12px;
    padding: 6px 0;
    border-bottom: 1px solid #f0f2f4;
}

.cv-entry:last-child {
    border-bottom: none;
}

.cv-entry-year {
    flex-shrink: 0;
    width: 120px;
    font-size: 13px;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    padding-top: 2px;
}

.cv-entry-body {
    flex: 1;
}

.cv-entry-head {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
}

.cv-entry-sub {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.cv-entry-sub a {
    color: var(--color-text-muted);
}

.cv-entry-sub a:hover {
    color: var(--color-accent);
}

/* inline variant for news entries: head + sub on same line */
.cv-entry-body--inline {
    flex: 1;
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
}

.cv-entry-body--inline .cv-entry-head {
    flex: 1;
}

.cv-entry-body--inline .cv-entry-sub {
    flex-shrink: 0;
    font-size: 12px;
    text-align: right;
}

.cv-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text);
    background: var(--color-surface);
    transition: background var(--transition), border-color var(--transition);
    margin-bottom: 24px;
}

.cv-download-btn:hover {
    background: #eaeef2;
    border-color: #b0b8c2;
    text-decoration: none;
    color: var(--color-text);
}

.badge-inv {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    padding: 1px 5px;
    border-radius: 3px;
    background: #8250df;
    color: #fff;
    vertical-align: middle;
    margin-right: 4px;
}

/* ===== Publications section ===== */
.pub-group-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin: 16px 0 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--color-border);
}

.pub-list {
    list-style: none;
}

.pub-item {
    display: flex;
    gap: 12px;
    padding: 8px 0;
    border-bottom: 1px solid #f0f2f4;
}

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

.pub-item:hover .pub-meta {
    border-right-color: #fd8c73;
}

.pub-meta {
    flex-shrink: 0;
    width: 112px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    border-right: 2px solid transparent;
    padding-right: 12px;
    transition: border-color var(--transition);
}

.pub-meta .pub-year {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-text-muted);
}

.pub-meta .pub-journal {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-text-muted);
    text-align: right;
    word-break: break-all;
}

.pub-meta .pub-journal a {
    color: var(--color-text-muted);
}

.pub-meta .pub-journal a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.pub-body {
    flex: 1;
    min-width: 0;
}

.pub-title-link {
    font-size: 14px;
    font-weight: 500;
    font-style: italic;
    color: var(--color-text);
    display: block;
    line-height: 1.45;
}

.pub-title-link:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.pub-authors {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 2px;
    line-height: 1.35;
}

.pub-authors b {
    color: var(--color-text);
    font-weight: 600;
}

/* ===== Footer ===== */
.site-footer {
    text-align: center;
    padding: 16px 0;
    font-size: 12px;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    margin-top: 32px;
    background: var(--color-bg);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .page-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        display: grid;
        grid-template-columns: 150px 1fr;
        column-gap: 16px;
        row-gap: 0;
        align-items: stretch;
        padding: 20px 16px;
    }

    .sidebar-avatar-wrap {
        grid-column: 1;
        grid-row: 1;
        display: flex;
        flex-direction: column;
    }

    .sidebar-avatar {
        width: 100%;
        height: 100%;
        border-radius: 10px;
        aspect-ratio: unset;
        margin: 0;
        object-fit: cover;
        object-position: center top;
        flex: 1;
    }

    .sidebar-info {
        grid-column: 2;
        grid-row: 1;
    }

    .sidebar-divider {
        display: none;
    }

    .sidebar-meta {
        margin-bottom: 4px;
    }

    .sidebar-links {
        grid-column: 1 / -1;
        flex-direction: row;
        flex-wrap: wrap;
        margin-top: 8px;
        padding-top: 8px;
        border-top: 1px solid var(--sidebar-border);
        gap: 2px;
    }

    .sidebar-link {
        padding: 6px 8px;
        gap: 0;
    }

    .link-label {
        display: none;
    }

    .sidebar-link svg,
    .sidebar-link i {
        font-size: 18px;
        width: 20px;
        height: 20px;
    }

    .main-content {
        padding: 0 16px 32px;
    }

    .nav-tabs-wrapper {
        margin-left: -16px;
        margin-right: -16px;
        padding: 0 16px;
    }

    .research-block-body img.img-right,
    .research-block-body img.img-left {
        float: none;
        max-width: 100%;
        margin: 8px 0;
    }

    .pub-meta {
        width: 68px;
        padding-right: 8px;
    }

    .cv-entry {
        flex-direction: column;
        gap: 2px;
    }

    .cv-entry-year {
        width: auto;
    }
}