/* --- Variables --- */
:root {
  --color-bg: #faf9f7;
  --color-bg-alt: #f0eeea;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #5c5c5c;
  --color-accent: #2c5282;
  --color-accent-hover: #1a365d;
  --color-border: #e2e0db;
  --font-serif: "Crimson Pro", Georgia, serif;
  --font-sans: "Source Sans 3", system-ui, sans-serif;
  --max-width: 1120px;
  --header-height: 64px;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
}

h2 {
  font-size: 2rem;
  margin: 0 0 0.75rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

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

/* --- Layout --- */
.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.container-narrow {
  width: min(100% - 2rem, 640px);
}

.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-lead {
  color: var(--color-text-muted);
  max-width: 52ch;
  margin: 0 0 2.5rem;
}

/* --- Header / Nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
  height: var(--header-height);
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 400;
  text-decoration: none;
}

.nav-menu a:hover {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

/* --- Hero --- */
.hero {
  padding: 3.5rem 0 4rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 2.5rem;
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.hero-photo img {
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow), 0 4px 20px rgba(0, 0, 0, 0.08);
  background: var(--color-bg-alt);
}

.hero-text h1 {
  font-size: 2.75rem;
  margin: 0 0 0.35rem;
}

.hero-title {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin: 0 0 1.25rem;
}

.hero-bio {
  max-width: 52ch;
  margin: 0 0 1.5rem;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.hero-links a {
  font-weight: 600;
  font-size: 0.95rem;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 280px);
  gap: 2.5rem;
  align-items: start;
}

.about-aside {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
}

.about-aside h3 {
  font-size: 1.1rem;
  margin: 0 0 1rem;
}

.about-aside dl {
  margin: 0;
}

.about-aside dt {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-top: 0.75rem;
}

.about-aside dt:first-child {
  margin-top: 0;
}

.about-aside dd {
  margin: 0.2rem 0 0;
  font-size: 0.95rem;
}

/* --- Education & experience timeline --- */
.cv-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 760px;
}

.cv-entry {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.cv-entry:first-child {
  padding-top: 0;
}

.cv-entry:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.cv-date {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.cv-entry-body h3 {
  font-size: 1.2rem;
  margin: 0 0 0.35rem;
}

.cv-org {
  margin: 0 0 0.5rem;
  font-weight: 600;
  color: var(--color-accent);
  font-size: 0.98rem;
}

.cv-detail {
  margin: 0;
  font-size: 0.98rem;
  color: var(--color-text-muted);
}

/* --- Publications: 3 columns --- */
.pub-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.pub-column {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  min-height: 200px;
}

.pub-column-header {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 1.25rem 1rem;
}

.pub-column-header h3 {
  font-size: 1.15rem;
  margin: 0 0 0.25rem;
  color: var(--color-accent);
}

.pub-column-sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

.pub-item {
  padding: 1.25rem;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-year {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-bottom: 0.5rem;
}

.pub-title {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.35;
}

.pub-title a {
  color: var(--color-text);
  text-decoration: none;
}

.pub-title a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.pub-authors {
  margin: 0 0 0.25rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.pub-venue {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.pub-links {
  margin: 0;
  font-size: 0.85rem;
}

.pub-links a {
  font-weight: 600;
}

/* --- Contact --- */
.contact-email {
  font-size: 1.25rem;
  margin: 1rem 0 1.5rem;
}

.contact-email a {
  font-weight: 600;
}

.contact-address {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- Footer --- */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.site-footer p {
  margin: 0;
}

/* --- Responsive --- */
@media (max-width: 960px) {
  .pub-columns {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 560px) {
  .cv-entry {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 0 1rem;
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: 0.65rem 1rem;
  }

  .hero-text h1 {
    font-size: 2.1rem;
  }

  .hero-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .hero-bio {
    max-width: none;
  }

  .hero-links {
    justify-content: center;
  }

  .section {
    padding: 3rem 0;
  }
}