:root {
  --font-head: "Space Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #ffffff;
  --surface: #f6f5f3;
  --text-primary: #111111;
  --text-secondary: #6b6b66;
  --border: #e6e4e0;
  --accent: #c2410c;
  --inverse-bg: #111111;
  --inverse-text: #ffffff;
  --gutter: clamp(1.25rem, 5.5vw, 5rem);
}

:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --surface: #161616;
  --text-primary: #f5f5f4;
  --text-secondary: #9a9a95;
  --border: #262626;
  --accent: #f97316;
  --inverse-bg: #f5f5f4;
  --inverse-text: #0a0a0a;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font: 400 16px/1.6 var(--font-body);
  letter-spacing: 0;
  transition: background-color 180ms ease, color 180ms ease;
}

body,
button {
  font-family: var(--font-body);
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.375rem var(--gutter);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
}

.brand,
.nav-right,
.nav,
.theme-toggle,
.menu-toggle,
.availability,
.hero-actions,
.project-meta,
.tags,
.contact-row,
.socials,
.site-footer a {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.1rem;
  font: 700 1.125rem/1 var(--font-head);
}

.brand-dot,
.overline,
em {
  color: var(--accent);
}

.nav-right {
  gap: 2.5rem;
}

.nav {
  gap: 2rem;
  color: var(--text-secondary);
  font-size: 0.94rem;
}

.nav a:hover,
.site-footer a:hover,
.socials a:hover {
  color: var(--accent);
}

.theme-toggle {
  gap: 0.35rem;
  min-height: 34px;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.72rem;
  line-height: 1;
}

.toggle-icon {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.toggle-icon-sun,
:root[data-theme="dark"] .toggle-icon-moon {
  color: var(--text-primary);
}

.toggle-icon-moon,
:root[data-theme="dark"] .toggle-icon-sun {
  color: var(--text-secondary);
}

.menu-toggle {
  display: none;
  width: 34px;
  height: 34px;
  justify-content: center;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0;
}

.menu-icon {
  width: 24px;
  height: 24px;
}

.menu-icon-close,
.mobile-nav {
  display: none;
}

main {
  width: 100%;
}

.hero {
  display: grid;
  gap: 1.5rem;
  padding: 3.25rem var(--gutter) 4rem;
}

.availability {
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  max-width: 1000px;
  margin-bottom: 0;
  font-size: clamp(2.125rem, 5vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
}

h1 span {
  display: block;
}

em {
  font-style: italic;
}

.hero-copy {
  max-width: 560px;
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 0.875rem;
  padding-top: 0.25rem;
}

.button,
.email-button,
.socials a {
  min-height: 52px;
  border-radius: 8px;
  font-weight: 500;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.95rem 1.625rem;
  border: 1px solid var(--border);
}

.button-primary,
.email-button {
  border-color: var(--inverse-bg);
  background: var(--inverse-bg);
  color: var(--inverse-text);
}

.section {
  padding: 3.5rem var(--gutter);
}

.section-heading {
  display: grid;
  gap: 0.625rem;
  margin-bottom: 2rem;
}

.overline {
  margin-bottom: 0;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h2 {
  max-width: 920px;
  margin-bottom: 0;
  font-size: clamp(1.6rem, 3vw, 2rem);
  line-height: 1.1;
}

.project-list {
  display: grid;
}

.project-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2.5rem;
  align-items: center;
  padding: 1.375rem 0;
  border-top: 1px solid var(--border);
}

.project-list .project-row:last-child,
.publication-section .project-row {
  border-bottom: 1px solid var(--border);
}

.project-row:hover .project-title,
.project-row:hover .project-arrow {
  color: var(--accent);
}

.project-main {
  display: grid;
  gap: 0.55rem;
  min-width: 0;
}

.project-title {
  font: 700 clamp(1.35rem, 2.2vw, 1.75rem)/1.2 var(--font-head);
  transition: color 160ms ease;
}

.project-desc {
  max-width: 720px;
  color: var(--text-secondary);
}

.project-meta {
  justify-content: flex-end;
  gap: 1rem;
}

.tags {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
  max-width: 410px;
}

.tags span {
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.82rem;
  line-height: 1;
}

.year {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.project-arrow {
  font-size: 1.2rem;
  line-height: 1;
  transition: color 160ms ease;
}

.about-section {
  display: grid;
  gap: 2.75rem;
  background: var(--surface);
}

.about-top {
  display: grid;
  grid-template-columns: minmax(0, 560px) minmax(320px, 1fr);
  gap: clamp(2.5rem, 6vw, 4rem);
}

.bio-col {
  display: grid;
  align-content: start;
  gap: 1.25rem;
}

.bio-col p:last-child {
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.skills-col {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2.5rem;
}

.skill-group h3 {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.skill-group ul {
  display: grid;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
  list-style: none;
  color: var(--text-primary);
}

.skill-group li {
  display: flex;
  align-items: flex-start;
  gap: 0.5625rem;
}

.skill-group li::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--border);
}

.stats div {
  display: grid;
  gap: 0.3rem;
  padding-top: 1.75rem;
}

.stats strong {
  font: 700 clamp(2.25rem, 4vw, 3rem)/1 var(--font-head);
}

.stats span {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.contact-section {
  display: grid;
  gap: 1.75rem;
  padding: 4.25rem var(--gutter) 2.75rem;
}

.contact-section h2 {
  max-width: 900px;
  font-size: clamp(1.9rem, 3.5vw, 2.75rem);
  letter-spacing: -0.02em;
}

.contact-row {
  flex-wrap: wrap;
  gap: 1rem;
}

.email-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  min-height: 44px;
  padding: 0;
}

.email-button svg {
  width: 20px;
  height: 20px;
}

.contact-or {
  color: var(--text-secondary);
}

.socials {
  flex-wrap: wrap;
  gap: 0.5rem;
}

.socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  color: var(--text-primary);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.socials a svg {
  width: 20px;
  height: 20px;
}

.socials a:hover {
  border-color: var(--accent);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem var(--gutter);
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  gap: 0.4rem;
  color: var(--text-primary);
  font-weight: 500;
}

@media (max-width: 900px) {
  .site-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    padding-block: 1.5rem;
  }

  .nav-right {
    gap: 0.75rem;
  }

  .nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .mobile-nav {
    grid-column: 1 / -1;
    width: 100%;
    margin-top: 0.25rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
  }

  .mobile-nav a {
    display: flex;
    min-height: 44px;
    align-items: center;
    padding: 0 0.75rem;
    border-radius: 6px;
    color: var(--text-primary);
    font-weight: 500;
  }

  .mobile-nav a:hover {
    background: var(--bg);
    color: var(--accent);
  }

  body.menu-open .mobile-nav {
    display: grid;
  }

  body.menu-open .menu-icon-open {
    display: none;
  }

  body.menu-open .menu-icon-close {
    display: block;
  }

  .hero {
    padding-top: 4.25rem;
  }

  h1 {
    font-size: clamp(2.125rem, 6vw, 3rem);
  }

  .project-row {
    grid-template-columns: 1fr;
    gap: 0.625rem;
    padding: 1.125rem 0;
  }

  .project-title {
    padding-right: 2rem;
  }

  .project-arrow {
    position: absolute;
    top: 1.125rem;
    right: 0;
  }

  .project-meta {
    justify-content: space-between;
    gap: 0.75rem;
  }

  .tags {
    justify-content: flex-start;
  }

  .about-top {
    grid-template-columns: 1fr;
  }

  .skills-col {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .skill-group h3 {
    margin-bottom: 0.5rem;
  }

  .skill-group ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem 1rem;
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
  }
}

@media (max-width: 560px) {
  :root {
    --gutter: 1.375rem;
  }

  .site-header {
    align-items: flex-start;
  }

  .brand {
    max-width: 210px;
    line-height: 1.2;
  }

  .theme-toggle {
    min-width: 0;
  }

  .section,
  .contact-section {
    padding-block: 2.75rem;
  }

  .hero {
    padding-block: 2.5rem;
  }

  h1 {
    font-size: 2.125rem;
  }

  h2,
  .contact-section h2 {
    font-size: 1.75rem;
  }

  .project-title {
    font-size: 1.5rem;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .button {
    justify-content: center;
  }

  .contact-row {
    display: grid;
    justify-items: start;
  }

  .socials {
    display: flex;
  }

  .site-footer {
    display: grid;
    gap: 0.75rem;
    padding-block: 1.25rem;
  }
}