/* ============================================
   Li Ma — Academic Homepage
   Mobile-first responsive stylesheet
   ============================================ */

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

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

body {
  font-family: "Palatino Linotype", Palatino, Georgia, serif;
  color: #333;
  background: #fff;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

.home-page {
  background:
    radial-gradient(circle at top left, #f3e9e3 0, #fbf8f6 22rem, #fff 40rem),
    linear-gradient(180deg, #faf7f4 0, #fff 18rem);
}

body:not(.home-page) {
  background:
    radial-gradient(circle at top left, #f3e9e3 0, #fbf8f6 22rem, #fff 40rem),
    linear-gradient(180deg, #faf7f4 0, #fff 18rem);
}

/* --- Layout Container --- */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --- Navigation --- */
.site-header {
  background: #800000; /* UChicago maroon */
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
  margin-bottom: 1.25rem;
}

.nav-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-name {
  font-size: 1.25rem;
  font-weight: 700;
  padding: 0.75rem 0;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.02em;
  order: 2;
  margin-left: auto;
}

.site-name:hover {
  opacity: 0.9;
}

@media (max-width: 700px) {
  .site-name {
    order: 0;
    margin-left: 0;
  }
}

/* Hamburger button (mobile only) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: 0.25rem;
}

.nav-menu a {
  display: block;
  padding: 0.75rem 0.75rem;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: 4px;
  transition: background 0.2s, color 0.15s;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: #fff;
  background: rgba(255,255,255,0.15);
}

/* Mobile nav */
@media (max-width: 700px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    padding-bottom: 0.5rem;
  }

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

  .nav-wrapper {
    flex-wrap: wrap;
  }

  .nav-menu a {
    padding: 0.6rem 0.5rem;
  }
}

/* --- Main Content --- */
main {
  padding: 1.5rem 0 3rem;
}

main > :first-child {
  margin-top: 0.75rem;
}

body:not(.home-page) main.container {
  max-width: 960px;
  margin-top: 1rem;
  padding: 2rem 2rem 2.5rem;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(128, 0, 0, 0.08);
  border-radius: 26px;
  box-shadow: 0 18px 40px rgba(83, 42, 42, 0.08);
}

body:not(.home-page) main > :first-child {
  margin-top: 0;
}

/* --- Homepage --- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  grid-template-areas:
    "copy photo"
    "copy contact";
  column-gap: 2.25rem;
  row-gap: 1rem;
  align-items: start;
  margin: 0.75rem 0 2rem;
}

.profile-photo {
  width: 86%;
  max-width: 100%;
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(83, 42, 42, 0.16);
  justify-self: center;
}

.hero-copy {
  grid-area: copy;
  max-width: 560px;
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 0.98;
  margin-bottom: 1rem;
  border: none;
  padding-bottom: 0;
}

.hero-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #5a2020;
  margin: 0 0 1rem;
}

.hero-affiliation {
  display: inline-flex;
  flex-direction: column;
  gap: 0.15rem;
  margin: 0 0 1.1rem;
  padding: 0.75rem 0.95rem;
  border-left: 4px solid #800000;
  background: rgba(128, 0, 0, 0.06);
  color: #4f2f2f;
}

.hero-affiliation a {
  color: inherit;
  text-decoration: none;
}

.hero-affiliation a:hover {
  text-decoration: underline;
}

.hero-affiliation-school {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.hero-affiliation-details {
  font-size: 0.96rem;
  color: #6a5252;
}

.hero-lead {
  font-size: 1.18rem;
  line-height: 1.65;
  color: #452f2f;
  max-width: 48rem;
  margin-bottom: 1rem;
}

.hero-support {
  font-size: 1rem;
  color: #5f4d4d;
  max-width: 43rem;
  margin-bottom: 1.5rem;
}

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

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(128, 0, 0, 0.2);
  background: rgba(255, 255, 255, 0.72);
  color: #5a2020;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(83, 42, 42, 0.08);
}

.button-link:hover {
  text-decoration: none;
  background: #fff;
  transform: translateY(-1px);
}

.button-primary {
  background: #800000;
  border-color: #800000;
  color: #fff;
}

.button-primary:hover {
  background: #6b0000;
  color: #fff;
}

.button-subtle {
  background: transparent;
  box-shadow: none;
}

.hero-photo-wrap {
  grid-area: photo;
  width: 280px;
}

.contact-card {
  grid-area: contact;
}

.info-card {
  padding: 1.25rem 1.35rem;
  border: 1px solid rgba(128, 0, 0, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 14px 34px rgba(83, 42, 42, 0.08);
}

.info-card h2 {
  margin-top: 0;
}

.contact-card p:last-child,
.info-card p:last-child {
  margin-bottom: 0;
}

.email-image {
  width: 150px;
  vertical-align: -6px;
}

@media (max-width: 700px) {
  .hero {
    grid-template-columns: 1fr;
    grid-template-areas:
      "photo"
      "copy"
      "contact";
  }

  .hero-copy,
  .hero-photo-wrap,
  .contact-card {
    max-width: 360px;
  }

  .hero-photo-wrap {
    width: min(100%, 360px);
  }
}

@media (max-width: 700px) {
  .hero {
    margin-top: 0.25rem;
  }

  .hero-copy h1 {
    display: none;
  }

  .profile-photo {
    width: 70%;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button-link {
    width: 100%;
  }
}

/* --- Typography --- */
h1, h2, h3 {
  color: #800000;
  line-height: 1.25;
}

h1 {
  font-size: 1.6rem;
  border-bottom: 2px solid #ddd;
  padding-bottom: 0.3rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.3rem;
  border-bottom: 1px solid #ddd;
  padding-bottom: 0.2rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.1rem;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

body:not(.home-page) h1 {
  font-size: clamp(2.1rem, 4vw, 2.8rem);
  line-height: 1.02;
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 1.5rem;
}

body:not(.home-page) h2 {
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid rgba(128, 0, 0, 0.15);
  padding-bottom: 0.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

body:not(.home-page) h3 {
  color: #5a2020;
  font-size: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.85rem;
}

p {
  margin-bottom: 0.8rem;
}

body:not(.home-page) p {
  color: #4d4343;
  line-height: 1.75;
}

a {
  color: #224b8d;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* --- Lists --- */
ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.3rem;
}

body:not(.home-page) li {
  line-height: 1.55;
}

/* --- Definition-style entries (Bio, Teaching) --- */
.entry {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

/* --- Publication list --- */
.pub-list {
  list-style: none;
  margin-left: 0;
}

.pub-list li {
  margin-bottom: 0.85rem;
  padding-left: 1rem;
  text-indent: -1rem;
  line-height: 1.45;
}

body:not(.home-page) .pub-list li {
  margin-bottom: 1rem;
  padding-left: 1.15rem;
  text-indent: -1.15rem;
  line-height: 1.6;
  color: #433838;
}

.pub-list .venue {
  font-style: italic;
}

.pub-list .links {
  font-size: 0.9rem;
}

.pub-list .links a {
  margin-right: 0.35rem;
}

.pub-highlight {
  font-weight: bold;
}

/* --- People page --- */
.people-section {
  margin-bottom: 1.5rem;
}

body:not(.home-page) .people-section {
  margin-bottom: 1.25rem;
  padding: 1.25rem 1.35rem;
  border: 1px solid rgba(128, 0, 0, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 14px 34px rgba(83, 42, 42, 0.06);
}

body:not(.home-page) .people-section h2 {
  margin-top: 0;
}

.people-section ul {
  list-style: none;
  margin-left: 0;
}

.people-section li {
  padding: 0.25rem 0;
}

body:not(.home-page) .people-section li {
  padding: 0.45rem 0;
  margin-bottom: 0;
  border-bottom: 1px solid rgba(128, 0, 0, 0.08);
}

body:not(.home-page) .people-section li:last-child {
  border-bottom: none;
}

/* --- Teaching page --- */
.teaching-list li {
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

body:not(.home-page) .teaching-list li {
  margin-bottom: 0.55rem;
  line-height: 1.55;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid #ddd;
  padding: 1rem 0;
  margin-top: 3rem;
  color: #999;
  font-size: 0.85rem;
  text-align: center;
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* --- Print --- */
@media print {
  .site-header, .nav-toggle {
    display: none;
  }
  main {
    padding-top: 0;
  }
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #666;
  }
}

@media (max-width: 600px) {
  body:not(.home-page) main.container {
    padding: 1.5rem 1.15rem 2rem;
    border-radius: 20px;
  }
}