:root {
  --bg: #171a1f;
  --bg-soft: #24303a;
  --surface: #222b33;
  --surface-2: #2c3742;
  --text: #f2eee7;
  --muted: #c8c0b4;
  --accent: #d7b26d;
  --accent-2: #e4c58a;
  --border: #4a5662;
  --bg-glow: #31414c;
  --max-width: 1180px;
  --radius: 14px;
}

:root[data-theme="light"] {
  --bg: #f3efe6;
  --bg-soft: #d9d2c5;
  --surface: #fffaf2;
  --surface-2: #f1e8db;
  --text: #22201c;
  --muted: #6c6257;
  --accent: #8b5e20;
  --accent-2: #a9752c;
  --border: #cdbda7;
  --bg-glow: #d7ccbc;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
}

body {
  font-family: "Segoe UI", "Source Sans 3", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 12% 10%, var(--bg-glow), var(--bg) 42%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 180ms ease, color 180ms ease;
}

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

a:hover,
a:focus-visible {
  color: var(--accent-2);
}

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  padding: 1.2rem 0 0.6rem;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  margin: 0;
  font-size: clamp(1.6rem, 2vw + 1rem, 2.6rem);
  letter-spacing: 0.3px;
}

.lang-switch {
  display: inline-flex;
  gap: 0.35rem;
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.lang-switch a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
}

.lang-switch a.active {
  background: var(--accent);
  color: #231707;
  border-color: var(--accent);
}

.theme-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 140ms ease, color 140ms ease;
}

.js .theme-toggle {
  display: inline-flex;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.theme-icon {
  width: 1.1rem;
  height: 1.1rem;
}

.theme-icon-sun {
  display: none;
}

:root[data-theme="light"] .theme-icon-moon {
  display: none;
}

:root[data-theme="light"] .theme-icon-sun {
  display: block;
}

.menu-toggle {
  display: none;
}

.menu-toggle summary {
  list-style: none;
}

.menu-toggle summary::-webkit-details-marker {
  display: none;
}

.hamburger-icon {
  display: inline-grid;
  gap: 0.24rem;
}

.hamburger-icon span {
  display: block;
  width: 1.15rem;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 160ms ease, opacity 160ms ease;
}

.main-nav {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  gap: 0.55rem;
}

.main-nav a,
.main-nav summary {
  display: inline-flex;
  padding: 0.52rem 0.9rem;
  border-radius: 9px;
  border: 1px solid transparent;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
}

.main-nav a:hover,
.main-nav a:focus-visible,
.main-nav summary:hover,
.main-nav summary:focus-visible,
.main-nav a.current,
.main-nav summary.current,
.nav-group > .nav-trigger.current,
.nav-group.current > .nav-trigger {
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.06);
}

.nav-group {
  position: relative;
}

.nav-group::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  width: max(100%, 13rem);
  height: 0.45rem;
}

.nav-group > .nav-trigger {
  position: relative;
  z-index: 11;
}

.nav-group summary {
  list-style: none;
}

.nav-group summary::-webkit-details-marker {
  display: none;
}

.nav-group > .nav-submenu {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 0;
  min-width: 13rem;
  padding: 0.45rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  display: none;
  gap: 0.25rem;
  z-index: 10;
}

.nav-group:hover > .nav-submenu,
.nav-group:focus-within > .nav-submenu {
  display: grid;
}

.nav-submenu a {
  width: 100%;
}

.mobile-nav-item {
  display: grid;
  gap: 0.35rem;
}

main {
  flex: 1;
  padding: 1rem 0 2rem;
}

.page-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.4rem;
  align-items: start;
}

.profile-card,
.content-card {
  background: color-mix(in srgb, var(--surface) 78%, transparent 22%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
}

.profile-card {
  position: sticky;
  top: 1rem;
}

.profile-card img {
  display: block;
  width: 100%;
  margin: 0;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
}

.profile-name {
  margin: 1rem 0 0.35rem;
  font-size: 2rem;
}

.profile-role {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.icon-links {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.icon-links li {
  margin: 0;
}

.icon-btn {
  display: inline-flex;
  width: 2.45rem;
  height: 2.45rem;
  border-radius: 999px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 84%, transparent 16%);
  color: var(--accent);
  transition: background 140ms ease, border-color 140ms ease, transform 140ms ease;
}

.icon-btn:hover,
.icon-btn:focus-visible {
  background: rgba(215, 178, 109, 0.14);
  border-color: rgba(215, 178, 109, 0.42);
  color: var(--accent);
  transform: translateY(-1px);
}

.icon-btn svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: currentColor;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.cv-section + .cv-section {
  margin-top: 1rem;
}

.cv-section h3 {
  margin-bottom: 0.4rem;
}

.cv-list {
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
}

.cv-download {
  font-weight: 700;
}

.content-card {
  transition: opacity 180ms ease, transform 180ms ease;
  opacity: 1;
}

.content-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.content-launch-btn {
  flex: 0 0 auto;
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 80%, transparent 20%);
  color: var(--accent);
  transition: background 140ms ease, border-color 140ms ease, transform 140ms ease;
}

.js .content-launch-btn {
  display: inline-flex;
}

.content-launch-btn:hover,
.content-launch-btn:focus-visible {
  background: rgba(215, 178, 109, 0.14);
  border-color: rgba(215, 178, 109, 0.42);
  color: var(--accent);
  transform: translateY(-1px);
}

.content-launch-btn svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

h2 {
  margin-top: 0;
  font-size: clamp(1.45rem, 1.4vw + 0.9rem, 2rem);
}

h3 {
  margin-bottom: 0.5rem;
}

p,
li {
  line-height: 1.65;
  color: var(--text);
}

.section-divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1.25rem 0;
}

.papers-list {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.paper-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  grid-template-areas:
    "main image"
    "abstract abstract";
  column-gap: 1rem;
  row-gap: 0.3rem;
  align-items: stretch;
  padding: 1rem;
  border: 1px solid rgba(215, 178, 109, 0.2);
  border-radius: 12px;
  background: color-mix(in srgb, var(--surface) 84%, transparent 16%);
  transition: background 180ms ease, border-color 180ms ease, grid-template-columns 180ms ease;
}

.paper-item:hover {
  border-color: rgba(215, 178, 109, 0.4);
}

.paper-main {
  grid-area: main;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.paper-title {
  margin: 0;
  font-size: 1.1rem;
}

.paper-title a {
  color: var(--text);
}

.paper-title a:hover,
.paper-title a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.18rem;
}

.paper-meta {
  margin: 0.45rem 0 0.7rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.paper-authors {
  margin-bottom: 0.18rem;
  color: var(--text);
}

.paper-journal-year {
  font-style: italic;
}

.paper-toggle {
  margin-top: auto;
  align-self: flex-start;
}

.paper-toggle > summary {
  display: list-item;
  width: fit-content;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
}

.paper-toggle > summary:hover,
.paper-toggle > summary:focus-visible {
  color: var(--accent-2);
}

.paper-abstract {
  grid-area: abstract;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 1;
  color: var(--text);
  font-size: 0.84rem;
  text-align: justify;
  hyphens: auto;
  transition: max-height 180ms ease, margin-top 180ms ease;
}

.paper-abstract p {
  margin: 0;
}

.abstract-word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.28rem);
  transition: opacity 45ms ease, transform 45ms ease;
  transition-delay: 0ms;
}

.paper-image-wrapper {
  grid-area: image;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 180ms ease;
}

.paper-image {
  width: 100%;
  max-width: 200px;
  height: auto;
  border-radius: 10px;
  border: 1px solid rgba(215, 178, 109, 0.2);
  transition: transform 180ms ease, max-width 180ms ease;
}

.paper-item:has(.paper-toggle[open]) {
  background: color-mix(in srgb, var(--surface) 82%, transparent 18%);
  grid-template-columns: minmax(0, 1fr) 120px;
}

.paper-item:has(.paper-toggle[open]) .paper-image {
  max-width: 110px;
}

.paper-item:has(.paper-toggle[open]) .paper-abstract {
  max-height: 48rem;
  margin-top: 0.15rem;
}

.paper-item:has(.paper-toggle[open]) .abstract-word {
  opacity: 1;
  transform: translateY(0);
  transition-delay: calc(var(--word-index) * 2ms);
}

.site-footer {
  margin: 0.6rem;
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface) 70%, black 30%);
  border: 1px solid var(--border);
}

.footer-inner {
  padding: 0.62rem 1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner a {
  font-weight: 600;
}

.single-column {
  max-width: 820px;
}

.note {
  color: var(--muted);
  font-size: 0.95rem;
}

.research-list {
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  .site-header {
    position: static;
    z-index: auto;
    padding-top: 0.9rem;
    background: transparent;
    backdrop-filter: none;
  }

  .header-top {
    padding-left: 3.7rem;
  }

  .site-title {
    font-size: clamp(1.35rem, 4.8vw, 2rem);
  }

  .page-grid {
    grid-template-columns: 1fr;
  }

  body:not(.page-home) .profile-card {
    display: none;
  }

  .profile-card {
    position: static;
  }

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .menu-toggle summary {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 120;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.85rem;
    height: 2.85rem;
    padding: 0;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--surface) 88%, black 12%);
    color: var(--text);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.28);
    cursor: pointer;
  }

  .menu-toggle::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(9, 11, 14, 0.52);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease;
    z-index: 109;
  }

  .menu-toggle[open]::before {
    opacity: 1;
  }

  .menu-toggle[open] summary {
    left: min(78vw, 320px);
    transform: translateX(-3.65rem);
  }

  .menu-toggle[open] .hamburger-icon span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .menu-toggle[open] .hamburger-icon span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[open] .hamburger-icon span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .menu-toggle .main-nav {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 110;
    width: min(78vw, 320px);
    height: 100dvh;
    margin-top: 0;
    padding: 5rem 1rem 1.2rem;
    background: color-mix(in srgb, var(--surface) 92%, black 8%);
    border-right: 1px solid var(--border);
    box-shadow: 18px 0 40px rgba(0, 0, 0, 0.34);
    transform: translateX(-105%);
    transition: transform 200ms ease;
  }

  .menu-toggle[open] .main-nav {
    transform: translateX(0);
  }

  .menu-toggle .main-nav ul {
    margin-top: 0;
    display: grid;
    gap: 0.35rem;
  }

  .menu-toggle .main-nav a {
    justify-content: flex-start;
    width: 100%;
  }

  .menu-toggle .nav-group {
    position: static;
  }

  .menu-toggle .nav-submenu {
    position: static;
    display: grid;
    margin: 0.25rem 0 0 0.75rem;
  }

  .content-launch-btn,
  .js .content-launch-btn {
    display: none !important;
  }

  .paper-item {
    grid-template-columns: 1fr;
    grid-template-areas:
      "main"
      "image"
      "abstract";
  }

  .paper-item:has(.paper-toggle[open]) {
    grid-template-columns: 1fr;
  }

  .paper-image-wrapper {
    width: 100%;
  }

  .paper-image {
    max-width: min(260px, 65%);
  }

  .paper-item:has(.paper-toggle[open]) .paper-image {
    max-width: min(260px, 65%);
  }

  .paper-abstract,
  .paper-item:has(.paper-toggle[open]) .paper-abstract {
    width: 100%;
  }

  .paper-item:has(.paper-toggle[open]) .paper-abstract {
    max-height: 120rem;
  }

}