/* ============================================================
   TOKENS
   ============================================================ */
:root {
  --cream: #faf6ee;
  --cream-alt: #f2ecdd;
  --surface: #ffffff;
  --charcoal: #262420;
  --charcoal-70: #565349;
  --line: #e2daca;
  --forest: #1f3d2e;
  --forest-dim: #2e5240;
  --navy: #1b2a45;
  --stamp-red: #8c3a2b;
  --header-bg: rgba(250, 246, 238, 0.88);
  --card-shadow: rgba(38, 36, 32, 0.35);
  --input-bg: rgba(250, 246, 238, 0.06);
  --contact-bg: #1f3d2e;
  --contact-text: #faf6ee;
  --contact-text-dim: #cadad0;
  --contact-text-eyebrow: #a9c7b4;
  --contact-line: rgba(250, 246, 238, 0.15);
  --footer-text-color: #ede9de;

  --font-display: "Source Serif 4", Georgia, serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;

  --wrap: 1180px;
  --radius: 3px;
}

[data-theme="dark"] {
  --cream: #17181a;
  --cream-alt: #1e2022;
  --surface: #222426;
  --charcoal: #ede9de;
  --charcoal-70: #a9a69c;
  --line: #34362f;
  --forest: #4a9974;
  --forest-dim: #6bb790;
  --navy: #7c93c2;
  --stamp-red: #d08469;
  --header-bg: rgba(23, 24, 26, 0.88);
  --card-shadow: rgba(0, 0, 0, 0.55);
  --input-bg: rgba(255, 255, 255, 0.04);
  --contact-bg: #0f2119;
  --contact-text: #f3f0e6;
  --contact-text-dim: #a9c0b3;
  --contact-text-eyebrow: #7fa890;
  --contact-line: rgba(243, 240, 230, 0.12);
  --footer-text-color: #2e5240;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--cream);
  color: var(--charcoal);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  cursor: pointer;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 32px;
}

/* subtle paper grain */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.025;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

:focus-visible {
  outline: 2px solid var(--forest);
  outline-offset: 3px;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--line);
  position: relative;
  flex-shrink: 0;
  transition:
    border-color 0.2s ease,
    background 0.2s ease;
}
.theme-toggle:hover {
  border-color: var(--forest);
}
.theme-icon {
  position: absolute;
  font-size: 1rem;
  line-height: 1;
  transition:
    opacity 0.25s ease,
    transform 0.25s ease;
}
.theme-icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}
.theme-icon-moon {
  opacity: 0;
  transform: scale(0.5) rotate(-40deg);
}
[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: scale(0.5) rotate(40deg);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
  color: var(--forest-dim);
}
.brand {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand-dot {
  color: var(--forest);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.main-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--charcoal-70);
  position: relative;
  padding: 4px 0;
  transition: color 0.2s;
}
.main-nav a:hover {
  color: var(--charcoal);
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--forest);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.main-nav a:hover::after {
  transform: scaleX(1);
}
.main-nav .nav-cta {
  border: 1px solid var(--charcoal);
  border-radius: var(--radius);
  padding: 8px 16px;
  color: var(--charcoal);
}
.main-nav .nav-cta::after {
  display: none;
}
.main-nav .nav-cta:hover {
  background: var(--charcoal);
  color: var(--cream);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--charcoal);
  display: block;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 96px 0 0;
  position: relative;
  overflow: hidden;
}
.hero-inner {
  max-width: 760px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--forest);
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
}
.eyebrow-mark {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--forest);
  display: inline-block;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.6rem);
  line-height: 1.02;
  font-weight: 600;
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}
.hero-role {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--forest-dim);
  font-weight: 500;
  margin: 0 0 22px;
}
.hero-bio {
  font-size: 1.08rem;
  color: var(--charcoal-70);
  max-width: 620px;
  margin: 0 0 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition:
    transform 0.18s ease,
    background 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}
.btn-primary {
  background: var(--forest);
  color: var(--cream);
}
.btn-primary:hover {
  background: var(--forest-dim);
  transform: translateY(-1px);
}
.btn-ghost {
  border-color: var(--charcoal);
  color: var(--charcoal);
}
.btn-ghost:hover {
  background: var(--charcoal);
  color: var(--cream);
  transform: translateY(-1px);
}
.btn-full {
  width: 100%;
}

.hero-meta {
  display: flex;
  gap: 48px;
  padding: 32px 0 44px;
  border-top: 1px solid var(--line);
}
.hero-meta-item {
  display: flex;
  flex-direction: column;
}
.meta-num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 600;
  color: var(--forest);
}
.meta-label {
  font-size: 0.8rem;
  color: var(--charcoal-70);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero-index {
  display: flex;
  gap: 18px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--charcoal-70);
  opacity: 0.55;
  border-top: 1px solid var(--line);
  padding: 16px 32px;
  animation: ticker 32s linear infinite;
  width: max-content;
}
@keyframes ticker {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* ============================================================
   SECTION SHELL
   ============================================================ */
.section {
  padding: 96px 0;
}
.section-alt {
  background: var(--cream-alt);
}
.section-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--forest);
  margin: 0 0 14px;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  line-height: 1.2;
  margin: 0 0 16px;
  max-width: 780px;
}
.section-sub {
  color: var(--charcoal-70);
  max-width: 620px;
  margin: 0 0 40px;
  font-size: 1.02rem;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  align-items: start;
}
.about-copy p {
  color: var(--charcoal-70);
  margin: 0 0 18px;
}
.about-copy .section-title {
  margin-top: 0;
}
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.tag {
  font-size: 0.82rem;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--forest-dim);
  background: var(--surface);
}

.side-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 32px;
}
.side-card-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--charcoal-70);
  margin: 0 0 12px;
}
.side-card-org {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
}
.side-card-role {
  margin: 4px 0 2px;
  color: var(--charcoal-70);
}
.side-card-since {
  margin: 0;
  font-size: 0.85rem;
  color: var(--forest-dim);
}

.timeline .side-card-title {
  margin-bottom: 20px;
}
.timeline-item {
  display: flex;
  gap: 14px;
  position: relative;
  padding-bottom: 26px;
  padding-left: 4px;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 18px;
  bottom: -8px;
  width: 1px;
  background: var(--line);
}
.timeline-item:last-child::before {
  display: none;
}
.timeline-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--forest);
  margin-top: 6px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.timeline-degree {
  font-weight: 600;
  margin: 0 0 2px;
}
.timeline-detail {
  font-size: 0.88rem;
  color: var(--charcoal-70);
  margin: 0 0 2px;
}
.timeline-org {
  font-size: 0.85rem;
  color: var(--forest-dim);
  margin: 0;
}

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.filter-row {
  display: flex;
  gap: 10px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.filter-btn {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 9px 18px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--charcoal-70);
  transition: all 0.2s ease;
}
.filter-btn:hover {
  border-color: var(--forest);
  color: var(--forest);
}
.filter-btn.is-active {
  background: var(--charcoal);
  border-color: var(--charcoal);
  color: var(--cream);
}

.pub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.pub-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease;
}
.pub-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px -18px var(--card-shadow);
  border-color: var(--forest);
}
.pub-card.is-hidden {
  display: none;
}
.pub-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.stamp {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 10px;
  border-radius: 2px;
  border: 1px solid currentColor;
  transform: rotate(-1.5deg);
}
.stamp-published {
  color: var(--forest);
}
.stamp-accepted {
  color: var(--navy);
}
.stamp-review {
  color: var(--stamp-red);
}
.pub-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--charcoal-70);
}
.pub-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.35;
  margin: 0 0 10px;
}
.pub-title-link {
  display: block;
  text-align: left;
  background: none;
  border: none;
  padding: 0;
  color: var(--charcoal);
  cursor: pointer;
  text-decoration-line: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition:
    color 0.2s ease,
    text-decoration-color 0.2s ease;
}
.pub-title-link:hover,
.pub-title-link:focus-visible {
  color: var(--forest-dim);
  text-decoration-color: var(--forest-dim);
}
.pub-authors {
  font-size: 0.85rem;
  color: var(--charcoal-70);
  margin: 0 0 12px;
}
.pub-abstract {
  font-size: 0.92rem;
  color: var(--charcoal-70);
  margin: 0 0 16px;
  flex-grow: 1;
}
.pub-venue {
  font-size: 0.85rem;
  color: var(--forest-dim);
  font-style: italic;
  margin: 0 0 14px;
}
.pub-links {
  display: flex;
  gap: 14px;
}
.pub-links a {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--forest);
  border-bottom: 1px solid transparent;
}
.pub-links a:hover {
  border-color: var(--forest);
}

/* ============================================================
   PUBLICATION MODAL
   ============================================================ */
.pub-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.pub-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}
.pub-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 19, 17, 0.68);
  backdrop-filter: blur(3px);
}
.pub-modal-dialog {
  position: relative;
  width: 100%;
  max-width: 820px;
  max-height: 88vh;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 30px 60px -20px var(--card-shadow);
  transform: translateY(14px) scale(0.98);
  transition: transform 0.25s ease;
}
.pub-modal.is-open .pub-modal-dialog {
  transform: translateY(0) scale(1);
}
.pub-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
}
.pub-modal-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}
.pub-modal-close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--cream-alt);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--charcoal-70);
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
}
.pub-modal-close:hover {
  border-color: var(--forest);
  color: var(--forest);
}
.pub-modal-body {
  flex: 1;
  overflow: auto;
  background: var(--cream-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}
.pub-modal-body img {
  width: 100%;
  height: auto;
  display: block;
}
.pub-modal-body iframe {
  width: 100%;
  height: 70vh;
  border: none;
  display: block;
}
.pub-modal-placeholder {
  padding: 40px;
  text-align: center;
  color: var(--charcoal-70);
  font-size: 0.92rem;
}
.pub-modal-footer {
  padding: 14px 22px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: flex-end;
}
.pub-modal-open-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--forest);
  border-bottom: 1px solid transparent;
}
.pub-modal-open-link:hover {
  border-color: var(--forest);
}

/* ============================================================
   TALKS
   ============================================================ */
.talk-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.talk-item {
  display: flex;
  gap: 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.talk-year {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--forest);
  width: 56px;
  flex-shrink: 0;
}
.talk-title {
  font-weight: 600;
  margin: 0 0 4px;
}
.talk-loc {
  font-size: 0.88rem;
  color: var(--charcoal-70);
  margin: 0;
}

/* ============================================================
   TOOLS / SKILLS
   ============================================================ */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 40px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  transition:
    border-color 0.2s ease,
    transform 0.2s ease;
}
.skill-card:hover {
  border-color: var(--forest);
  transform: translateY(-2px);
}
.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 8px;
  color: var(--forest-dim);
}
.skill-card p {
  font-size: 0.86rem;
  color: var(--charcoal-70);
  margin: 0;
  line-height: 1.55;
}

.lang-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.lang-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--charcoal-70);
  margin-right: 6px;
}
.lang-item {
  font-size: 0.85rem;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--charcoal);
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-section {
  background: var(--contact-bg);
  color: var(--contact-text);
  transition: background-color 0.3s ease;
}
.section-tag-light {
  color: var(--contact-text-eyebrow);
}
.section-title-light {
  color: var(--contact-text);
}
.section-sub-light {
  color: var(--contact-text-dim);
}

.contact-grid {
  margin-top: 36px;
}
.contact-grid-solo {
  display: grid;
  grid-template-columns: minmax(0, 640px);
  justify-content: start;
}
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.contact-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 32px;
}
.contact-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 20px 0;
  border-bottom: 1px solid var(--contact-line);
  transition: padding-left 0.2s ease;
}
.contact-link:hover {
  padding-left: 8px;
}
.contact-link-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--contact-text-eyebrow);
}
.contact-link-value {
  font-size: 1.05rem;
  font-weight: 500;
}
.contact-location {
  margin-top: 22px;
  font-size: 0.88rem;
  color: var(--contact-text-dim);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--charcoal);
  color: var(--footer-text-color);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 32px;
  font-size: 0.85rem;
}
.to-top {
  background: none;
  border: 1px solid rgba(250, 246, 238, 0.25);
  color: inherit;
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 0.8rem;
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
}
.to-top:hover {
  border-color: var(--cream);
  color: var(--cream);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .pub-grid {
    grid-template-columns: 1fr;
  }
  .skill-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-grid-solo {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .wrap {
    padding: 0 20px;
  }
  .header-inner {
    padding: 16px 20px;
  }
  .main-nav {
    position: fixed;
    top: 63px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--cream);
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 24px;
    gap: 22px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .main-nav.is-open {
    transform: translateX(0);
  }
  .nav-toggle {
    display: flex;
  }
  .hero {
    padding-top: 56px;
  }
  .hero-meta {
    gap: 28px;
    flex-wrap: wrap;
  }
  .hero-actions {
    margin-bottom: 44px;
  }
  .section {
    padding: 64px 0;
  }
  .skill-grid {
    grid-template-columns: 1fr;
  }
  .talk-item {
    flex-direction: column;
    gap: 6px;
  }
  .talk-year {
    width: auto;
  }
  .contact-links-grid {
    grid-template-columns: 1fr;
    column-gap: 0;
  }
  .footer-inner {
    flex-direction: column;
    gap: 14px;
    text-align: center;
  }
}