/* ── Variables ───────────────────────────────────────────── */
:root {
  --color-bg: #f8f6f2;
  --color-bg-alt: #f0ebe3;
  --color-text: #2c2825;
  --color-text-muted: #5c5650;
  --color-accent: #4a3f35;
  --color-border: #d9d2c8;
  --color-link: #3d342c;
  --color-link-hover: #1a1614;

  --font-display: "Cormorant Garamond", "Georgia", serif;
  --font-body: "EB Garamond", "Georgia", serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;

  --max-width: 72rem;
  --max-narrow: 42rem;

  --transition: 0.2s ease;
}

/* ── Reset & Base ────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-link-hover);
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-accent);
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  letter-spacing: 0.01em;
}

h2 {
  font-size: 1.5rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.25rem;
  margin: 0 0 var(--space-xs);
}

p {
  margin: 0 0 var(--space-sm);
}

code {
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  background: var(--color-bg-alt);
  border-radius: 2px;
}

/* ── Layout ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container.narrow {
  max-width: var(--max-narrow);
}

/* ── Skip link ───────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent);
  color: var(--color-bg);
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ── Header & Nav ────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
}

.site-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.site-nav ul {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  text-transform: lowercase;
  font-variant: small-caps;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  text-decoration: underline;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ── Hero (Home) ─────────────────────────────────────────── */
.hero {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.hero-label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.hero-intro {
  font-size: 1.1rem;
  max-width: 36rem;
  margin-bottom: var(--space-md);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.55em 1.25em;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-bg);
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  transition: background var(--transition), color var(--transition);
}

.btn:hover {
  background: transparent;
  color: var(--color-accent);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-download::before {
  content: "↓ ";
  font-size: 0.9em;
}

/* ── Page header ─────────────────────────────────────────── */
.page-header {
  padding: var(--space-lg) 0 var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin: 0 0 var(--space-xs);
}

.lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ── Sections ────────────────────────────────────────────── */
.section {
  padding: var(--space-lg) 0 var(--space-xl);
}

.section-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-xs);
  margin-top: var(--space-lg);
}

.section-footer {
  margin-top: var(--space-md);
  font-style: italic;
}

/* ── Cards (Home) ────────────────────────────────────────── */
.card-list {
  list-style: none;
  margin: var(--space-md) 0 0;
  padding: 0;
}

.card {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.card:first-child {
  padding-top: 0;
}

.card-meta {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.card h3 a {
  text-decoration: none;
  color: var(--color-accent);
}

.card h3 a:hover {
  text-decoration: underline;
}

/* ── Profile photo ───────────────────────────────────────── */
.profile-photo {
  width: 100%;
  max-width: 14rem;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

.hero-with-photo .container {
  display: grid;
  gap: var(--space-lg);
  align-items: start;
}

.hero-photo {
  width: 100%;
  max-width: 11rem;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border: 1px solid var(--color-border);
  justify-self: center;
}

/* ── About ───────────────────────────────────────────────── */
.about-grid {
  display: grid;
  gap: var(--space-lg);
}

.about-sidebar {
  display: flex;
  flex-direction: column;
}

.cv-box {
  padding: var(--space-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
}

.cv-box h2 {
  margin-top: 0;
}

.cv-note {
  margin: var(--space-sm) 0 0;
  color: var(--color-text-muted);
}

/* ── Timeline ────────────────────────────────────────────── */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

.timeline-date {
  font-variant: small-caps;
  color: var(--color-text-muted);
}

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

.plain-list li {
  padding: 0.25em 0;
}

/* ── Publications ────────────────────────────────────────── */
.pub-list {
  list-style: none;
  margin: var(--space-md) 0 0;
  padding: 0;
  counter-reset: pub;
}

.pub-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  counter-increment: pub;
}

.pub-item::before {
  content: counter(pub) ".";
  display: block;
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.pub-authors {
  margin: 0;
  font-size: 0.95rem;
}

.pub-title {
  margin: 0.15em 0;
  font-size: 1.1rem;
}

.pub-venue {
  margin: 0;
  color: var(--color-text-muted);
}

.pub-links {
  margin: var(--space-xs) 0 0;
  font-size: 0.9rem;
}

.pub-links a {
  text-decoration: none;
}

.pub-links a:hover {
  text-decoration: underline;
}

/* ── Research projects ───────────────────────────────────── */
.project {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.project:first-of-type {
  padding-top: 0;
}

.project-header {
  margin-bottom: var(--space-sm);
}

.project-header h2 {
  margin: var(--space-xs) 0 0;
  font-size: 1.35rem;
}

.project-status {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.project-meta {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

/* ── Contact ─────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  gap: var(--space-lg);
}

.contact-block h2 {
  margin-top: 0;
  font-size: 1.15rem;
  letter-spacing: 0.05em;
  text-transform: lowercase;
  font-variant: small-caps;
}

.links-list a {
  text-decoration: none;
}

.links-list a:hover {
  text-decoration: underline;
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.site-footer p {
  margin: 0;
}

.footer-links a {
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 640px) {
  html {
    font-size: 17px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .site-nav.is-open {
    max-height: 20rem;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: var(--space-sm) var(--space-md) var(--space-md);
  }

  .site-nav li {
    padding: var(--space-xs) 0;
  }

  .hero {
    padding-top: var(--space-lg);
  }

  .site-footer .container {
    flex-direction: column;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }
}

@media (min-width: 768px) {
  .hero-with-photo .container {
    grid-template-columns: 11rem 1fr;
  }

  .hero-photo {
    justify-self: start;
  }

  .about-grid {
    grid-template-columns: 1fr 16rem;
    align-items: start;
  }

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