/* =====================================================
   Ryan Abman – Academic Website Stylesheet (Clean & Minimal)
   ===================================================== */

/* ── Custom Properties ─────────────────────────────── */
:root {
  --color-white:    #ffffff;
  --color-alt:      #f7f6f3;      /* warm off-white for alternating sections */
  --color-text:     #1a1a18;      /* near-black */
  --color-muted:    #6b7280;
  --color-subtle:   #9ca3af;
  --color-border:   #e5e4e0;
  --color-accent:   #1d4ed8;      /* clean blue for links & highlights */
  --color-accent-h: #1e40af;
  --color-tag-bg:   #eff6ff;
  --color-tag-text: #1d4ed8;

  --font-serif: 'EB Garamond', Georgia, serif;
  --font-sans:  'Inter', system-ui, sans-serif;

  --nav-height: 64px;
  --max-width:  1080px;
  --radius:     4px;
  --transition: 0.2s ease;
}

/* ── Reset & Base ──────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-accent-h);
}

ul {
  list-style: none;
}

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

/* ── Typography helpers ────────────────────────────── */
.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-subtle);
  margin-bottom: 1.25rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-intro {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

.subsection-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1rem;
  margin-top: 2.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-text);
  color: var(--color-white);
}

.btn-primary:hover {
  background: #333;
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-text);
  color: var(--color-text);
  transform: translateY(-1px);
}

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

.container--split {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 0 4rem;
  align-items: start;
}

.split-label {
  padding-top: 0.35rem;
  text-align: right;
}

/* ── Sections ──────────────────────────────────────── */
.section {
  padding: 5rem 0;
}

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

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

/* ── Navigation ────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
}

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

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.nav-logo:hover {
  color: var(--color-text);
  opacity: 0.7;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
  background: var(--color-alt);
}

.nav-links .nav-cta {
  background: var(--color-text);
  color: var(--color-white);
  margin-left: 0.5rem;
  font-weight: 500;
  padding: 0.4rem 1rem;
}

.nav-links .nav-cta:hover {
  background: #333;
  color: var(--color-white);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ── Hero ──────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  background: var(--color-white);
  display: flex;
  align-items: center;
  padding: var(--nav-height) 0 4rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 0 3.5rem;
  align-items: center;
}

.hero-photo-wrap {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 80% 25%;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-subtle);
  margin-bottom: 0.6rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
}

.hero-affiliation {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.hero-bio {
  font-size: 1rem;
  color: var(--color-muted);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ── About ─────────────────────────────────────────── */
.bio-text p {
  color: var(--color-muted);
  margin-bottom: 1.1rem;
  font-size: 1rem;
  line-height: 1.8;
}

.bio-text p:last-child {
  margin-bottom: 0;
}

.about-meta {
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 2rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.meta-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-subtle);
}

.meta-value {
  font-size: 0.925rem;
  color: var(--color-text);
}

/* ── Research ──────────────────────────────────────── */
.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 3rem;
}

.tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 0.3rem 0.8rem;
  border-radius: 99px;
  border: 1px solid rgba(29, 78, 216, 0.15);
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.project-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.project-item:first-child {
  border-top: 1px solid var(--color-border);
}

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

.project-title {
  font-size: 0.975rem;
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: 0.2rem;
}

.project-meta {
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.abstract-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 99px;
  padding: 0.2rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-muted);
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--font-sans);
  transition: all var(--transition);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.abstract-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.abstract-toggle svg {
  transition: transform var(--transition);
}

.abstract-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.abstract-toggle[aria-expanded="true"] {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.abstract-body {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease;
}

.abstract-body.open {
  max-height: 600px;
}

.abstract-body p {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.75;
  padding: 0.75rem 1rem;
  background: var(--color-alt);
  border-radius: var(--radius);
  border-left: 2px solid var(--color-accent);
}

/* ── Publications ──────────────────────────────────── */
.pub-list {
  display: flex;
  flex-direction: column;
}

.pub-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.pub-item:first-child {
  border-top: 1px solid var(--color-border);
}

.pub-year {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-subtle);
  padding-top: 0.2rem;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.pub-details {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.pub-citation {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.65;
}

.pub-citation em {
  font-style: italic;
}

.pub-citation a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

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

.project-title a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

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

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.pub-press {
  font-size: 0.78rem;
  color: var(--color-subtle);
}

.pub-award {
  font-size: 0.78rem;
  color: #92400e;
  background: #fef3c7;
  padding: 0.15rem 0.6rem;
  border-radius: 99px;
  font-weight: 500;
}

.pub-link {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-accent);
}

.pub-link:hover {
  color: var(--color-accent-h);
}

/* ── Contact ───────────────────────────────────────── */
.contact-items {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.contact-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-subtle);
}

.contact-value {
  font-size: 0.975rem;
  color: var(--color-text);
  line-height: 1.6;
}

a.contact-value:hover {
  color: var(--color-accent);
}

/* ── Footer ────────────────────────────────────────── */
.site-footer {
  background: var(--color-alt);
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.footer-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 600;
}

.footer-affiliation {
  font-size: 0.8rem;
  color: var(--color-muted);
  line-height: 1.6;
}

.footer-copy {
  font-size: 0.72rem;
  color: var(--color-subtle);
  margin-top: 0.25rem;
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 860px) {
  .container--split {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .split-label {
    text-align: left;
    padding-top: 0;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .hero-photo-wrap {
    margin-inline: auto;
  }

  .hero-bio {
    margin-inline: auto;
  }

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

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

@media (max-width: 640px) {
  :root {
    --nav-height: 60px;
  }

  .section {
    padding: 3.5rem 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    z-index: 99;
    border-top: 1px solid var(--color-border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1rem;
  }

  .nav-links .nav-cta {
    margin-left: 0;
  }

  .pub-item {
    grid-template-columns: 42px 1fr;
    gap: 1rem;
  }

  .container {
    padding-inline: 1.25rem;
  }
}