/* ==========================================================================
   Minimal theme  —  static adaptation of the Jekyll "minimal" theme
   (orderedlist / jekyll-theme-minimal). Typography, palette and spacing
   are kept faithful to the original; a sidebar navbar, dark mode, and the
   content components for this site are layered on top.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --text: #727272;
  --heading: #222222;
  --heading2: #393939;
  --heading3: #494949;
  --muted: #777777;
  --accent: #267cb9;
  --accent-dark: #006699;
  --border: #e5e5e5;
  --border-strong: #d0d7de;
  --card-bg: #f6f8fb;
  --code-bg: #f8f8f8;
  --nav-hover-bg: #f6f8fa;
  --nav-active-bg: #f1f6fb;
  --tag-bg: #ffffff;
  --tag-text: #444444;
  --tag-muted-bg: #f1f3f5;
  --tag-muted-text: #495057;
  --badge-bg: #267cb9;
  --badge-text: #ffffff;
  --shadow: rgba(0, 0, 0, 0.12);

  --max-width: 1040px;
  --sidebar-width: 280px;
}

:root[data-theme="dark"] {
  --bg: #0f1014;
  --text: #adb2ba;
  --heading: #e8eaed;
  --heading2: #dfe2e6;
  --heading3: #d3d7dd;
  --muted: #8b919b;
  --accent: #6cb0ec;
  --accent-dark: #93c7f5;
  --border: #2c313a;
  --border-strong: #3a414c;
  --card-bg: #1d2026;
  --code-bg: #1d2127;
  --nav-hover-bg: #20242b;
  --nav-active-bg: #232a35;
  --tag-bg: #1d2026;
  --tag-text: #c5cad2;
  --tag-muted-bg: #252a32;
  --tag-muted-text: #aeb4bd;
  --badge-bg: #2f6da3;
  --badge-text: #eaf2fb;
  --shadow: rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--bg);
  padding: 50px;
  font:
    14px/1.6 "Noto Sans",
    "Helvetica Neue",
    Helvetica,
    Arial,
    sans-serif;
  color: var(--text);
  font-weight: 400;
  margin: 0;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--heading);
  margin: 0 0 20px;
}
h1,
h2,
h3 {
  line-height: 1.1;
}
h1 {
  font-size: 28px;
}
h2 {
  color: var(--heading2);
  font-size: 22px;
}
h3,
h4,
h5,
h6 {
  color: var(--heading3);
}
h3 {
  font-size: 18px;
}

p,
ul,
ol,
table,
pre,
dl {
  margin: 0 0 20px;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover,
a:focus {
  color: var(--accent-dark);
}

strong {
  color: var(--heading);
  font-weight: 700;
}

blockquote {
  border-left: 1px solid var(--border);
  margin: 0 0 20px;
  padding: 0 0 0 20px;
  font-style: italic;
}

img {
  max-width: 100%;
}

hr {
  border: 0;
  background: var(--border);
  height: 1px;
  margin: 0 0 20px;
}

small {
  font-size: 11px;
}

/* ----------------------------------------------------------------- layout */

.wrapper {
  display: flex;
  align-items: flex-start;
  gap: 60px;
  max-width: var(--max-width);
  margin: 0 auto;
}

header.sidebar {
  width: var(--sidebar-width);
  flex: 0 0 var(--sidebar-width);
  position: sticky;
  top: 50px;
  -webkit-font-smoothing: subpixel-antialiased;
}

section {
  flex: 1 1 auto;
  min-width: 0;
  padding-bottom: 50px;
}

/* ---------------------------------------------------------------- sidebar */

.profile-photo {
  width: 180px;
  height: auto;
  border-radius: 6px;
  display: block;
  margin: 0 0 14px;
  box-shadow: 0 1px 4px var(--shadow);
}

.photo-caption {
  font-size: 11px;
  font-style: italic;
  color: var(--muted);
  margin: -8px 0 14px;
}

.site-title {
  font-size: 24px;
  margin: 0 0 6px;
  line-height: 1.2;
}
.site-title a {
  color: var(--heading);
}
.site-title a:hover {
  color: var(--accent);
}

.tagline {
  margin: 0 0 10px;
  font-size: 13px;
}

.location {
  font-size: 13px;
  margin: 0 0 16px;
}
.location .icon {
  color: var(--accent);
  margin-right: 5px;
}

/* inline SVG icons (sized to the surrounding font-size) */
.icon {
  width: 1em;
  height: 1em;
  fill: currentColor;
  vertical-align: -0.125em;
  flex-shrink: 0;
}

/* hamburger toggle — hidden on desktop, shown on mobile (see media query) */
.nav-toggle {
  display: none;
}

/* navbar */
nav.site-nav {
  margin: 0 0 18px;
}
nav.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
nav.site-nav li {
  margin: 0;
}
nav.site-nav a {
  display: block;
  padding: 5px 10px;
  color: var(--text);
  border-left: 3px solid transparent;
  border-radius: 0 4px 4px 0;
}
nav.site-nav a:hover {
  color: var(--accent);
  background: var(--nav-hover-bg);
  border-left-color: var(--border);
}
nav.site-nav a.active {
  color: var(--accent);
  font-weight: 700;
  border-left-color: var(--accent);
  background: var(--nav-active-bg);
}

/* social row + theme toggle */
.social-links {
  margin: 0 0 10px;
  font-size: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.social-links a {
  color: var(--text);
}
.social-links a:hover {
  color: var(--accent);
}

.theme-toggle {
  margin-left: auto;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  color: var(--text);
}
.theme-toggle:hover {
  color: var(--accent);
}

.contact-note {
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 16px;
  word-break: break-word;
}

.sidebar-footer {
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 4px;
}
.sidebar-footer a {
  color: var(--muted);
  text-decoration: underline;
}

/* ------------------------------------------------------------- content UI */

.page-title {
  margin-bottom: 24px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.loading {
  color: var(--muted);
  font-style: italic;
}

/* badges & tags */
.badge {
  display: inline-block;
  padding: 3px 9px;
  font-size: 12px;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--badge-text);
  white-space: nowrap;
}
.badge.outline {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.tag {
  display: inline-block;
  padding: 3px 9px;
  font-size: 12px;
  border-radius: 4px;
  background: var(--tag-bg);
  border: 1px solid var(--border-strong);
  color: var(--tag-text);
}
.tag-muted {
  background: var(--tag-muted-bg);
  border-color: var(--border-strong);
  color: var(--tag-muted-text);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* small action buttons (Abs / Code / Paper / Video …) */
.btn {
  display: inline-block;
  padding: 2px 10px;
  margin: 4px 6px 0 0;
  font-size: 12px;
  line-height: 1.7;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  color: var(--accent);
  background: var(--bg);
  cursor: pointer;
}
.btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* abstract / summary toggle panel */
.abstract.hidden {
  display: none;
}
.abstract.open {
  display: block;
  margin-top: 10px;
  padding: 12px 16px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 13px;
}
.abstract.open p {
  margin: 0;
  text-align: justify;
}

/* news ------------------------------------------------------------------ */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.news-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.news-date {
  flex: 0 0 110px;
}
.news-date .badge {
  display: block;
  text-align: center;
}
.news-body {
  flex: 1;
}

/* education ------------------------------------------------------------- */
.edu-entry {
  margin-bottom: 22px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}
.edu-entry:last-child {
  border-bottom: 0;
}
.edu-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}
.edu-degree {
  margin: 0 0 4px;
  font-size: 16px;
  color: var(--accent);
}
.edu-inst {
  font-style: italic;
  margin: 0 0 8px;
}
.edu-detail {
  margin: 0;
}

/* research / publications ---------------------------------------------- */
.section-title {
  margin-top: 32px;
}
ol.pub-list {
  list-style: none;
  counter-reset: pub;
  margin: 0;
  padding: 0;
}
.pub-item {
  display: flex;
  gap: 16px;
  margin-bottom: 22px;
}
.pub-abbr {
  flex: 0 0 112px;
  width: 112px;
  padding-top: 2px;
}
.pub-abbr .badge {
  display: block;
  text-align: center;
  white-space: normal;
  word-break: break-word;
  line-height: 1.4;
}
.pub-main {
  flex: 1;
  min-width: 0;
}
.pub-title {
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 2px;
}
.pub-title a {
  color: var(--heading);
}
.pub-title a:hover {
  color: var(--accent);
}
.pub-authors {
  font-size: 13px;
  margin-bottom: 2px;
}
.pub-venue {
  font-style: italic;
  font-size: 13px;
}
.pub-status {
  font-size: 12px;
}

.wordcloud {
  margin-top: 36px;
}
.wordcloud img {
  display: block;
  width: 100%;
  max-width: 420px;
  border-radius: 6px;
  box-shadow: 0 1px 4px var(--shadow);
  margin-top: 10px;
}

/* work ----------------------------------------------------------------- */
.work-entry {
  margin-bottom: 32px;
}
.work-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}
.work-title {
  margin: 0 0 2px;
  font-size: 17px;
}
.work-company {
  margin: 0 0 12px;
  color: var(--accent);
}
.work-company a {
  color: inherit;
  font-weight: 700;
}
.work-subhead {
  font-weight: 700;
  margin: 14px 0 6px;
  color: var(--heading);
}
.course-item {
  padding: 10px 12px;
  margin-bottom: 8px;
  background: var(--card-bg);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
}
.course-item .course-name {
  margin-bottom: 6px;
}

/* projects / talks / awards lists -------------------------------------- */
ul.project-list {
  padding-left: 20px;
}
ul.project-list li {
  margin-bottom: 14px;
}
.proj-title {
  font-weight: 700;
  color: var(--heading);
}
.proj-tech {
  font-style: italic;
  font-weight: 400;
  color: var(--muted);
  font-size: 13px;
}

ul.talk-list {
  list-style: none;
  padding: 0;
}
ul.talk-list li {
  margin-bottom: 18px;
}

ul.award-list {
  padding-left: 20px;
}
ul.award-list li {
  margin-bottom: 8px;
}

/* skills --------------------------------------------------------------- */
.skill-group {
  margin-bottom: 24px;
}
.skill-group h3 {
  display: inline-block;
  margin-bottom: 12px;
  padding-bottom: 4px;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

/* ------------------------------------------------------------- responsive */
@media (max-width: 860px) {
  body {
    padding: 25px;
  }
  .wrapper {
    flex-direction: column;
    gap: 28px;
  }
  header.sidebar {
    position: static;
    width: auto;
    flex-basis: auto;
    border-bottom: 1px solid var(--border);
    padding-bottom: 20px;
  }
  .profile-photo {
    width: 140px;
  }

  /* hamburger button pinned to the top-right corner */
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;

    position: fixed;
    top: 12px;
    right: 12px;

    z-index: 1001;

    width: 34px; /* smaller */
    height: 34px; /* smaller */
    padding: 8px 7px; /* reduced */

    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 6px;

    box-shadow: 0 2px 6px var(--shadow);
    cursor: pointer;
  }

  .nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;

    background: var(--heading);
    border-radius: 2px;

    transition:
      transform 0.25s ease,
      opacity 0.2s ease;
  }

  .nav-toggle.open span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  /* nav collapses into a dropdown anchored under the hamburger */
  nav.site-nav {
    position: fixed;
    top: 50px;
    right: 16px;
    z-index: 1000;
    width: 210px;
    max-width: calc(100vw - 32px);
    margin: 0;
    padding: 6px;
    background: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    box-shadow: 0 6px 24px var(--shadow);
    display: none;
  }
  nav.site-nav.open {
    display: block;
  }
  nav.site-nav ul {
    display: block;
  }
  nav.site-nav li {
    margin: 1px 0;
  }
  nav.site-nav a {
    border-left: 0;
    border-radius: 6px;
    padding: 9px 12px;
  }
  nav.site-nav a.active {
    border-left: 0;
  }

  /* footer is relocated (via JS) below the page content on mobile */
  .wrapper > .sidebar-footer {
    width: 100%;
    margin-top: 0;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    text-align: center;
  }
}

@media (max-width: 480px) {
  body {
    padding: 15px;
  }
  .news-item {
    flex-direction: column;
    gap: 4px;
  }
  .news-date {
    flex-basis: auto;
  }
  .news-date .badge {
    display: inline-block;
  }
  .pub-item {
    flex-direction: column;
    gap: 6px;
  }
  .pub-abbr {
    flex-basis: auto;
  }
  .pub-abbr .badge {
    display: inline-block;
  }
  .work-head,
  .edu-head {
    flex-direction: column;
    gap: 6px;
  }
  .wordcloud img {
    max-width: 100%;
  }
}