:root {
    --bg: #0d1117;
    --surface: #151b23;
    --surface-hover: #1a222d;

    --text: #e6edf3;
    --muted: #9da7b3;
    --subtle: #6f7a86;

    --accent: #7aa2f7;
    --accent-soft: rgba(122, 162, 247, 0.12);

    --border: #27313d;
    --nav-bg: rgba(13, 17, 23, 0.94);
    --hero-glow: rgba(122, 162, 247, 0.12);

    --max-width: 1080px;

    --radius: 10px;
}


:root[data-theme="light"] {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;

    --text: #172033;
    --muted: #526174;
    --subtle: #6b7789;

    --accent: #2563eb;
    --accent-soft: rgba(37, 99, 235, 0.12);

    --border: #d9e0e8;
    --nav-bg: rgba(248, 250, 252, 0.94);
    --hero-glow: rgba(37, 99, 235, 0.12);
}


* {
    box-sizing: border-box;
}


html {
    scroll-behavior: smooth;
}


body {
    margin: 0;

    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;

    background: var(--bg);
    color: var(--text);

    line-height: 1.6;

    -webkit-font-smoothing: antialiased;
}


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


a:hover {
    text-decoration: underline;
}


/* =========================
   NAVIGATION
   ========================= */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;

    background: var(--nav-bg);

    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);

    border-bottom: 1px solid var(--border);
}


.nav-container {
    max-width: var(--max-width);

    margin: 0 auto;
    padding: 14px 24px;

    display: flex;
    align-items: center;
    justify-content: space-between;
}


.nav-name {
    color: var(--text);

    font-weight: 700;
    font-size: 1rem;
}


.nav-links {
    display: flex;
    gap: 22px;
}


.nav-links a {
    color: var(--muted);

    font-size: 0.88rem;
    font-weight: 500;
}


.nav-links a:hover {
    color: var(--text);
    text-decoration: none;
}


.theme-toggle {
    display: inline-flex;
    align-items: center;

    gap: 7px;

    padding: 7px 10px;

    color: var(--muted);
    background: transparent;

    border: 1px solid var(--border);
    border-radius: 999px;

    cursor: pointer;

    font: inherit;
    font-size: 0.82rem;
    font-weight: 600;
}


.theme-toggle:hover {
    color: var(--text);
    background: var(--surface-hover);
}


.theme-toggle:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
}


.theme-toggle__icon {
    font-size: 1rem;
    line-height: 1;
}


/* =========================
   HERO
   ========================= */

.hero {
    border-bottom: 1px solid var(--border);

    background:
        radial-gradient(
            circle at top right,
            var(--hero-glow),
            transparent 35%
        ),
        var(--bg);
}


.hero-content {
    max-width: var(--max-width);

    margin: 0 auto;
    padding: 68px 24px 58px;
}


.hero-eyebrow {
    display: inline-block;

    margin: 16px 0 0;

    color: var(--text);
    font-size: 1.3rem;
    font-weight: 600;
}


.hero h1 {
    margin: 0;

    font-size: clamp(3rem, 7vw, 5rem);

    line-height: 1;

    letter-spacing: -0.055em;
}


.hero-tagline {
    margin: 5px 0 5px;

    color: var(--accent);

    font-size: 1.18rem;
    font-weight: 500;
}


.hero-organisation {
    margin: 0 0 18px;

    color: var(--muted);

    font-size: 0.96rem;
}


.hero-contact {
    display: flex;
    flex-wrap: wrap;

    gap: 8px 20px;

    color: var(--muted);

    font-size: 0.88rem;
}


/* =========================
   SECTIONS
   ========================= */

.section {
    max-width: var(--max-width);

    margin: 0 auto;

    padding: 52px 24px;
}


.section + .section {
    border-top: 1px solid var(--border);
}


.section-heading {
    margin-bottom: 24px;
}


.section-heading h2 {
    margin: 0;

    font-size: 1.8rem;

    line-height: 1.2;

    letter-spacing: -0.035em;
}


/* =========================
   PROFILE
   ========================= */

.profile-text {
    max-width: 900px;

    color: var(--muted);

    font-size: 1rem;
}


.profile-text p {
    margin: 0 0 14px;
}


.profile-text p:first-child {
    color: var(--text);
}


/* =========================
   EXPERIENCE / EDUCATION
   ========================= */

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

    gap: 12px;
}


.timeline-item {
    display: grid;

    grid-template-columns: 170px 1fr;

    gap: 26px;

    padding: 22px 24px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius);
}


.timeline-item:hover {
    background: var(--surface-hover);
}


.timeline-item--expandable {
    cursor: pointer;

    transition: background 160ms ease, border-color 160ms ease;
}


.timeline-item--expandable:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
}


.timeline-item--expandable[aria-expanded="true"] {
    background: var(--surface-hover);
    border-color: var(--accent);
}


.timeline-period {
    color: var(--accent);

    font-size: 0.86rem;
    font-weight: 600;
}


.timeline-content h3 {
    margin: 0;

    font-size: 1.12rem;

    letter-spacing: -0.015em;
}


.organisation {
    margin: 4px 0 12px;

    color: var(--muted);

    font-size: 0.9rem;
}


.timeline-toggle {
    display: inline-flex;
    align-items: center;

    gap: 6px;

    color: var(--accent);

    font-size: 0.82rem;
    font-weight: 600;
}


.timeline-toggle__icon {
    display: inline-block;

    font-size: 1.1rem;
    line-height: 1;

    transition: transform 160ms ease;
}


.timeline-item--expandable[aria-expanded="true"] .timeline-toggle__icon {
    transform: rotate(180deg);
}


.timeline-content ul {
    margin: 10px 0 0;

    padding-left: 18px;
}


.timeline-content li {
    margin-bottom: 5px;

    color: var(--muted);
}


.timeline-content h4 {
    margin: 15px 0 5px;

    font-size: 0.92rem;
}


.timeline-details[hidden] {
    display: none;
}


/* =========================
   PUBLICATIONS
   ========================= */

.publication-list {
    display: grid;
    gap: 12px;
}


.publication {
    padding: 22px 24px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius);
}


.publication:hover {
    background: var(--surface-hover);
}


.publication-venue {
    margin: 0 0 7px;

    color: var(--accent);

    font-size: 0.82rem;
    font-weight: 600;
}


.publication h3 {
    margin: 0;

    max-width: 900px;

    font-size: 1.16rem;

    line-height: 1.4;

    letter-spacing: -0.018em;
}


.publication h3 a {
    color: inherit;
}


.publication-authors {
    margin: 8px 0;

    color: var(--subtle);

    font-size: 0.9rem;
}


.publication-description {
    margin: 0;

    max-width: 900px;

    color: var(--muted);
}


/* =========================
   SERVICE
   ========================= */

.standard-item {
    padding: 22px 24px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius);
}


.standard-item h3 {
    margin: 0 0 10px;

    font-size: 1.08rem;
}


.standard-item ul {
    margin: 0;
    padding-left: 18px;
}


.standard-item li {
    margin-bottom: 5px;

    color: var(--muted);
}


/* =========================
   SKILLS
   ========================= */

.skills-grid {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 12px;
}


.skill-card {
    padding: 20px 22px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius);
}


.skill-card:hover {
    background: var(--surface-hover);
}


.skill-card h3 {
    margin: 0 0 7px;

    font-size: 1rem;
}


.skill-card p {
    margin: 0;

    color: var(--muted);

    font-size: 0.94rem;
}


/* =========================
   REFERENCES
   ========================= */

.reference-grid {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 12px;
}


.reference-card {
    padding: 20px 22px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius);
}


.reference-card h3 {
    margin: 0 0 7px;

    font-size: 1.05rem;
}


.reference-card p {
    margin: 2px 0;

    color: var(--muted);

    font-size: 0.9rem;
}


.reference-card a {
    display: inline-block;

    margin-top: 9px;

    font-size: 0.88rem;
}


/* =========================
   FOOTER
   ========================= */

footer {
    padding: 28px 24px;

    border-top: 1px solid var(--border);

    text-align: center;

    color: var(--subtle);

    font-size: 0.8rem;
}


.nav-pages {
    display: flex;
    gap: 4px;
    margin-left: auto;
    flex-shrink: 0;
    padding: 3px;
    border: 1px solid var(--border);
    border-radius: 999px;
}

.nav-pages a {
    padding: 5px 12px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 600;
}

.nav-pages a:hover, .nav-pages a[aria-current] {
    color: var(--accent);
    background: var(--accent-soft);
    text-decoration: none;
}

.nav-pages a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.nav-container { gap: 16px; }
.theme-toggle { flex-shrink: 0; }
@media (max-width: 960px) {
    .nav-container .nav-links { display: none; }
}
.blog-section { max-width: 860px; min-height: 70vh; }
.blog-section h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.2; }
.blog-section h2 { font-size: 1.4rem; line-height: 1.4; }
.blog-section p, .blog-date { color: var(--muted); }
.blog-date { font-size: 0.88rem; }
.blog-tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; list-style: none; }
.blog-tags li { padding: 3px 10px; background: var(--accent-soft); color: var(--accent); border-radius: 20px; font-size: 0.8rem; }
.blog-post-heading { margin: 32px 0; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.blog-prose { line-height: 1.8; overflow-wrap: anywhere; }
.blog-prose p { color: var(--text); }
.blog-prose h2, .blog-prose h3 { margin-top: 2em; }
.blog-prose img { max-width: 100%; height: auto; border-radius: var(--radius); }
.blog-prose pre { overflow-x: auto; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.blog-prose code { font-size: 0.9em; background: var(--surface); padding: 2px 4px; }
.blog-prose pre code { padding: 0; }
.blog-prose blockquote { margin-left: 0; padding-left: 20px; border-left: 3px solid var(--accent); }
.blog-prose table { display: block; overflow-x: auto; border-collapse: collapse; }
.blog-prose th, .blog-prose td { padding: 8px 12px; border: 1px solid var(--border); }
.blog-prose a { text-decoration: underline; text-underline-offset: 3px; }

/* =========================
   MOBILE
   ========================= */

@media (max-width: 760px) {

    .nav-container {
        padding-left: 18px;
        padding-right: 18px;
    }


    .nav-links {
        display: none;
    }


    .theme-toggle {
        padding: 7px 9px;
    }


    .theme-toggle__label {
        display: none;
    }


    .hero-content {
        padding:
            52px
            18px
            46px;
    }


    .hero h1 {
        font-size: clamp(3rem, 17vw, 4.6rem);
    }


    .section {
        padding:
            40px
            18px;
    }


    .section-heading {
        margin-bottom: 18px;
    }


    .timeline-item {
        grid-template-columns: 1fr;

        gap: 8px;

        padding: 18px;
    }


    .skills-grid,
    .reference-grid {
        grid-template-columns: 1fr;
    }


    .publication,
    .skill-card,
    .reference-card,
    .standard-item {
        padding: 18px;
    }

}
.reference-empty {
    grid-column: 1 / -1;

    padding: 22px 24px;

    color: var(--muted);
    background: var(--surface);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}

.reference-empty p {
    margin: 0;
}