/* =============================================================
   PALETTE — black / white / gray, with two accents used sparingly.
   Blue is reserved for interactive things (links, hover, active nav);
   yellow is a highlighter for genuinely notable text only.
   Everything else is neutral. One source of truth.
   ============================================================= */
:root {
    /* Neutrals */
    --ink:      #16181d;   /* headings, strong text */
    --graphite: #545a63;   /* secondary text */
    --mist:     #8a9099;   /* captions, dates, muted */
    --line:     #e4e6ea;   /* borders, dividers */

    /* Accents — the only chromatic colors on the site */
    --blue:      #1f5fd6;  /* links & interactive only */
    --blue-deep: #17489f;
    --blue-soft: #e9f0fc;  /* blue tag background */
    --mark:      rgba(255, 211, 63, 0.34);  /* yellow highlighter — soft, emphasis only */

    /* Content tags — one neutral gray; the text label carries the meaning. */
    --tag-burgundy-bg: #eef0f2;  --tag-burgundy-fg: #4a4f57;
    --tag-rose-bg:     #eef0f2;  --tag-rose-fg:     #4a4f57;
    --tag-mauve-bg:    #eef0f2;  --tag-mauve-fg:    #4a4f57;
    --tag-slate-bg:    #eef0f2;  --tag-slate-fg:    #4a4f57;
    --tag-gray-bg:     #eef0f2;  --tag-gray-fg:     #4a4f57;

    /* Talk-type tags — deliberately color-coded (oral / invited / poster) */
    --tag-yellow-bg:   #fff1b0;  --tag-yellow-fg:   #6b5300;
}

/* =============================================================
   BASE TYPOGRAPHY & RESET
   ============================================================= */
body {
    margin: 0;
    padding: 0;
}

html {
    font-family: 'Inter', sans-serif;
    font-size: 12pt;
    font-weight: 300;
}

h1, h2, h3, h4 {
    font-weight: 500;
}

h2 {
    font-size: 17pt;
}

h3 {
    font-size: 14pt;
}

h3, h4 {
    margin-top: 24px;
    margin-bottom: 0px;
}

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

a:hover {
    text-decoration: underline;
    text-underline-offset: 2px;
}

p.lightweight {
    font-weight: 100;
}

mark {
    background-color: var(--mark);
    color: var(--ink);
    padding: 0 3px;
    border-radius: 3px;
}

hr {
    border: none;
    border-top: 1px solid #e8e8e8;
    margin: 1em 0;
}

footer {
    margin-top: 3em;
    border-top: 1px solid #eee;
    padding-top: 1.4em;
    color: #888;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

footer p {
    margin: 0;
}

.footer-mark {
    width: 26px;
    height: 26px;
    order: 2;          /* keep the mark on the right, text on the left */
    flex-shrink: 0;
}

/* =============================================================
   LAYOUT
   ============================================================= */
#content {
    position: relative;
    width: 100%;
    max-width: 900px;
    padding: 20px;
    box-sizing: border-box;
    margin: 0 auto;
    text-align: left;
    line-height: 1.6;
}

#content > *:first-child {
    margin-top: 0;
}

#content p {
    font-size: 11pt;
}

@media (max-width: 900px) {
    html {
        font-size: 12pt;
    }
    #content {
        padding: 20px;
        max-width: 100%;
    }
}

/* =============================================================
   NAVIGATION
   ============================================================= */
nav {
    position: relative;
    max-width: 900px;
    margin: 0 auto 24px auto;
    width: 100%;
    padding: 0;
    box-sizing: border-box;
}

.navbar {
    display: flex;
    justify-content: left;
    list-style-type: none;
    padding: 0;
    margin: 0;
    background-color: white;
    width: 100%;
    box-sizing: border-box;
    text-align: center;
    flex-wrap: wrap;
    font-weight: 500;
}

.navbar li {
    margin: 0;
}

.navbar a {
    color: black;
    text-decoration: none;
    padding: 14px 20px;
    display: block;
    text-align: left;
}

.navbar a:hover {
    color: white;
    background-color: var(--blue);
}

.navbar a.active {
    font-weight: 700;
    color: var(--blue);
    border-bottom: 3px solid var(--blue);
    background: none;
}

/* Hamburger button — hidden by default, shown on mobile */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1000;
    position: absolute;
    top: 10px;
    right: 10px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: black;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 3px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

@media (max-width: 600px) {
    nav {
        margin-bottom: 0;
        padding: 0;
    }

    .hamburger {
        display: flex;
    }

    .navbar {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 50px;
        left: 0;
        background-color: white;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        z-index: 999;
    }

    .navbar.active {
        display: flex;
    }

    .navbar li {
        width: 100%;
        border-bottom: 1px solid #eee;
    }

    .navbar a {
        padding: 16px 20px;
        text-align: left;
        width: 100%;
    }
}

@media (min-width: 601px) and (max-width: 768px) {
    .navbar a {
        padding: 12px 16px;
        font-size: 14px;
    }
}

/* =============================================================
   TABLES
   ============================================================= */
table {
    width: 100%;
    max-width: 800px;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 11pt;
}

th, td {
    border: none;
    border-bottom: 1px solid #e0e0e0;
    padding: 8px 12px;
    text-align: left;
}

th:first-child, td:first-child {
    padding-left: 0;
}

th {
    font-weight: 600;
    color: black;
    background: none;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover {
    background-color: #f5f6f8;
}

@media (max-width: 600px) {
    table {
        width: 100%;
        border-collapse: collapse;
    }

    th, td {
        display: block;
        width: 100%;
        box-sizing: border-box;
    }

    thead {
        display: none;
    }

    tbody tr {
        display: block;
        margin-bottom: 10px;
    }

    td::before {
        content: attr(data-label);
        font-weight: bold;
        display: inline-block;
        width: 40%;
        text-align: left;
    }
}

/* =============================================================
   HOME PAGE
   ============================================================= */
.hero {
    display: flex;
    align-items: flex-start;
    gap: 32px;
    margin-bottom: 1em;
}

.hero-text {
    flex: 1;
}

.hero-text h2 {
    margin-top: 0;
}

.hero-text p {
    font-size: 10.5pt;
}

.avatar {
    width: 150px;
    border-radius: 6px;
    flex-shrink: 0;
}

@media (max-width: 600px) {
    .hero {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .avatar {
        width: 120px;
    }

    .hero-text {
        text-align: left;
    }
}

.icons {
    list-style-type: none;
    font-size: x-large;
    padding: 0;
    display: flex;
    justify-content: flex-start;
    gap: 16px;
    margin: 1em 0;
}

.icons li {
    display: flex;
    align-items: center;
}

.icons a {
    color: black;
}

.icons a:hover {
    color: var(--blue);
}

.news-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.news-list li {
    display: flex;
    gap: 16px;
    padding: 6px 0;
    border-bottom: 1px solid #f0f0f0;
    line-height: 1.5;
}

.news-list li:last-child {
    border-bottom: none;
}

.news-date {
    font-family: 'SFMono-Regular', Consolas, monospace;
    font-size: 10.5pt;
    color: #888;
    white-space: nowrap;
    padding-top: 2px;
    min-width: 78px;
}

.news-content {
    flex: 1;
    font-size: 11pt;
}

.sublist {
    text-align: left;
    margin: 6pt 0;
    font-size: 11pt;
}

.research-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.research-list li {
    padding: 10px 0;
}

.research-topic {
    font-size: 11.5pt;
    font-weight: 600;
    margin-bottom: 6px;
}

.research-desc {
    font-size: 11pt;
    color: #444;
    margin-bottom: 6px;
}

.research-papers {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px 0;
    margin-top: 2px;
    font-size: 11pt;
}

.research-paper-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.research-venue {
    font-size: 11pt;
    color: black;
}

.research-sublabel {
    font-size: 11pt;
    color: black;
}

/* =============================================================
   RESEARCH & PUBLICATIONS
   ============================================================= */
.paper-card {
    background: #fff;
    padding-top: 12px;
    padding-bottom: 12px;
    border-top: 1px solid #e8e8e8;
}

.paper-card--image {
    display: flex;
    align-items: flex-start;
}

h2 + .paper-card,
h3 + .paper-card,
p + .paper-card {
    border-top: none;
}

h3 + p {
    margin-top: 4px;
}

.toc {
    flex-shrink: 0;
    margin-right: 15px;
}

.toc img {
    width: 300px;
    height: 200px;
    object-fit: contain;
    background-color: white;
    padding: 0px;
    display: block;
}

.toc--book img {
    width: 110px;
    height: auto;
    border-radius: 3px;
    box-shadow: 2px 3px 8px rgba(0,0,0,0.15);
}

.content {
    flex-grow: 1;
    padding: 5px;
}

.paper-title {
    font-size: 12pt;
    font-weight: 600;
    margin: 0 0 3px 0;
    line-height: 1.4;
}

.paper-authors {
    font-size: 10.5pt;
    color: #444;
    margin: 0 0 2px 0;
}

.paper-venue {
    font-size: 10.5pt;
    color: #555;
    margin: 0 0 6px 0;
}

.paper-venue i {
    color: var(--ink);
    font-style: italic;
}

.paper-links {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 6px;
}

.paper-link {
    font-size: 10.5pt;
    color: var(--blue);
    border: 1px solid var(--line);
    border-radius: 3px;
    padding: 1px 6px;
}

.paper-link:hover {
    background-color: var(--blue);
    border-color: var(--blue);
    color: white;
}

.tldr {
    font-size: 10.5pt;
    color: #555;
    margin: 0;
}

@media (max-width: 900px) {
    .paper-card--image {
        flex-direction: column;
        align-items: center;
    }

    .toc {
        margin-right: 0;
        margin-bottom: 10px;
    }

    .content {
        text-align: left;
    }
}

/* Timeline layout */
.timeline-group {
    display: flex;
    gap: 0 24px;
    margin-bottom: 4px;
}

.timeline-year {
    width: 58px;
    flex-shrink: 0;
    font-weight: 600;
    color: var(--graphite);
    font-size: 11.5pt;
    padding-top: 12px;
    text-align: right;
}

.timeline-papers {
    flex: 1;
    border-left: 2px solid #e8e8e8;
    padding-left: 20px;
}

.timeline-papers .paper-card:first-child {
    border-top: none;
}

.selected-pubs .paper-card {
    border-top: none;
    padding: 6px 0;
    line-height: 1.45;
}

.selected-pubs .paper-title {
    display: block;
    font-weight: 400;
    font-size: 11.5pt;
    color: #1a1a1a;
    margin: 0 0 2px 0;
}

.selected-pubs .paper-authors,
.selected-pubs .paper-venue {
    display: inline;
    margin: 0;
}

.selected-pubs .paper-authors::after,
.selected-pubs .paper-venue::after {
    content: " ";
}

.selected-pubs .paper-links {
    display: inline-flex;
    margin: 0 0 0 4px;
    vertical-align: baseline;
}

/* Paper topic tags */
.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 5px;
}

.paper-tag {
    font-size: 9pt;
    font-weight: 600;
    padding: 1px 7px;
    border-radius: 3px;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.paper-tag--ml-ms {
    background-color: var(--tag-burgundy-bg);
    color: var(--tag-burgundy-fg);
}

.paper-tag--survey {
    background-color: var(--tag-rose-bg);
    color: var(--tag-rose-fg);
}

.paper-tag--patent {
    background-color: var(--tag-mauve-bg);
    color: var(--tag-mauve-fg);
}

.paper-tag--reliable-ml {
    background-color: var(--tag-slate-bg);
    color: var(--tag-slate-fg);
}

.tag-legend {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin: 1em 0;
}

.scholar-note {
    font-size: 10.5pt;
    color: #666;
    font-style: italic;
    margin-top: -2px;
    margin-bottom: 22px;
}

.tag-legend-label {
    font-size: 10.5pt;
    color: #888;
}

@media (max-width: 600px) {
    .timeline-group {
        flex-direction: column;
        gap: 0;
    }

    .timeline-year {
        width: auto;
        text-align: left;
        padding-top: 12px;
        padding-bottom: 2px;
        padding-left: 12px;
        border-left: 2px solid #e8e8e8;
    }

    .timeline-papers {
        padding-left: 12px;
    }
}

/* =============================================================
   TALKS
   ============================================================= */
.talk-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.talk-item {
    padding: 12px 0;
    border-bottom: 1px solid #e8e8e8;
}

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

.talk-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.talk-type {
    font-size: 9pt;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 3px;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.talk-type--oral {
    background-color: var(--blue-soft);
    color: var(--blue-deep);
}

.talk-type--poster {
    background-color: var(--tag-gray-bg);
    color: var(--tag-gray-fg);
}

.talk-type--invited {
    background-color: var(--tag-yellow-bg);
    color: var(--tag-yellow-fg);
}

.talk-date {
    font-size: 10.5pt;
    color: #888;
    font-family: 'SFMono-Regular', Consolas, monospace;
}

.talk-title {
    font-size: 11pt;
    margin-bottom: 3px;
}

.talk-meta {
    font-size: 10.5pt;
    color: #555;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.talk-link {
    font-size: 10.5pt;
    color: var(--blue);
    border: 1px solid var(--line);
    border-radius: 3px;
    padding: 1px 6px;
}

.talk-link:hover {
    background-color: var(--blue);
    border-color: var(--blue);
    color: white;
}

/* =============================================================
   BLOGS LISTING
   ============================================================= */
.blog-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.blog-item {
    padding: 12px 0;
    border-bottom: 1px solid #e8e8e8;
}

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

.blog-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.blog-tag {
    font-size: 9pt;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 3px;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.blog-date {
    font-size: 10.5pt;
    color: #888;
    font-family: 'SFMono-Regular', Consolas, monospace;
}

.blog-title {
    font-size: 11pt;
}

.blog-title a {
    color: black;
}

.blog-title a:hover {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-tag--project {
    background-color: var(--blue-soft);
    color: var(--blue-deep);
}

.blog-tag--wild-thoughts {
    background-color: var(--tag-yellow-bg);
    color: var(--tag-yellow-fg);
}

.blog-tag--study-notes {
    background-color: var(--tag-gray-bg);
    color: var(--tag-gray-fg);
}

.blog-tag--paper-reading {
    background-color: var(--tag-gray-bg);
    color: var(--tag-gray-fg);
}

/* =============================================================
   SERVICE & TEACHING
   ============================================================= */
.service-list {
    list-style: none;
    padding: 0;
    margin: 12px 0;
    max-width: 800px;
}

.service-item {
    display: flex;
    gap: 16px;
    padding: 8px 0;
    border-bottom: 1px solid #e0e0e0;
    line-height: 1.5;
}

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

.service-label {
    font-size: 11pt;
    font-weight: 600;
    color: black;
    white-space: nowrap;
    min-width: 100px;
}

.service-content {
    flex: 1;
    font-size: 11pt;
}

.service-note {
    font-size: 10.5pt;
    color: #888;
    font-style: italic;
    margin-top: 4px;
}