/* -----------------------------------------------------------
   Global layout & typography
----------------------------------------------------------- */

body {
  background-color: #f3f4f6;
  color: #111827;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Helvetica, Arial, sans-serif;
  font-size: 1.5rem; /* large, readable base text */
}

/* main page container that R Markdown uses */
.main-container {
  max-width: 1000px;
  margin: 40px auto 30px;  /* reduced margins */
  padding: 32px 36px 40px;
  background-color: #ffffff;
  border-radius: 18px;
  box-shadow: 0 20px 55px rgba(15, 23, 42, 0.10);
}

/* headings */
h1 {
  font-size: 2.4rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  color: #0f172a;
  margin-top: 0;
  margin-bottom: 1.4rem;
}

h2 {
  font-size: 2.0rem;          /* larger than body text */
  font-weight: 600;
  color: #111827;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  text-transform: uppercase;  /* capitalized section titles */
  letter-spacing: 0.08em;
}

h3 {
  font-size: 1.6rem;
  font-weight: 600;
  color: #111827;
  margin-top: 1.6rem;
  margin-bottom: 0.4rem;
}

/* body text */
p {
  font-size: 1em;  /* inherits from body (1.5rem) */
  line-height: 1.7;
  margin-bottom: 0.9rem;
}

strong, b {
  font-weight: 600;
}

/* links */
a {
  color: #2563eb;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

/* default image behavior */
img {
  max-width: 100%;
  height: auto;
}

/* -----------------------------------------------------------
   Navbar (overriding flatly slightly)
----------------------------------------------------------- */

.navbar.navbar-default {
  background-color: #0f172a;
  border-color: transparent;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.3);
}

.navbar-default .navbar-brand,
.navbar-default .navbar-nav > li > a {
  color: #e5e7eb !important;
  font-weight: 500;
}

.navbar-default .navbar-brand:hover,
.navbar-default .navbar-brand:focus,
.navbar-default .navbar-nav > li > a:hover,
.navbar-default .navbar-nav > li > a:focus {
  color: #ffffff !important;
}

.navbar-default .navbar-nav > .active > a,
.navbar-default .navbar-nav > .active > a:hover,
.navbar-default .navbar-nav > .active > a:focus {
  background-color: #111827 !important;
  color: #ffffff !important;
  box-shadow: inset 0 -3px 0 #3b82f6;
}

/* -----------------------------------------------------------
   Home / About page (index.rmd)
----------------------------------------------------------- */

/* centered, wide hero image */
.hero-img {
  display: block;
  width: 80%;          /* 4/5 of the content width */
  max-width: 80%;
  height: auto;        /* show full image, no cropping */
  margin: 0 auto 1.5rem;
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
}


/* two logos side by side under text */
.about-logo-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  max-width: 480px;          /* narrower than main container */
  margin: 0.8rem auto 1.8rem;
}

.about-logo-img {
  max-width: 180px;          /* hard cap on each logo */
  width: 45%;
  height: auto;
  object-fit: contain;
}

/* -----------------------------------------------------------
   People page (people.rmd) – aligned headshots with 1:4 ratio
----------------------------------------------------------- */

.person-row {
  display: flex;
  align-items: flex-start;
  gap: 1.75rem;
  margin-bottom: 1.7rem;
}

.person-photo {
  flex: 1;                /* 1 part */
  max-width: 170px;       /* visually stable width */
}

.person-text {
  flex: 4;                /* 4 parts => 1:4 ratio */
}

/* uniform profile photos */
.profile-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
}

/* -----------------------------------------------------------
   Projects page (projects.rmd)
----------------------------------------------------------- */

.project-img {
  width: 100%;
  max-width: 100%;
  height: 120px; /* ~50% of the earlier natural banner height */
  object-fit: cover; /* keeps the image undistorted, crops top/bottom if needed */
  border-radius: 16px;
  margin: 0.75rem 0 1.25rem;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.16);
}


/* -----------------------------------------------------------
   Publications page (publications.rmd)
----------------------------------------------------------- */

.publications-page > h2 {
  font-size: 2.0rem;
  letter-spacing: 0.08em;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  color: #4b5563;
  border-bottom: 1px solid #e5e7eb;
  padding-bottom: 0.2rem;
}

/* hanging indent for each reference entry */
.publications-page p {
  margin-bottom: 0.6rem;
  text-indent: -1.5rem;
  padding-left: 1.5rem;
}

/* small spacing helper when under-review is inside a toggle */
.under-review-block {
  margin-top: 1.5rem;
}

/* -----------------------------------------------------------
   Collapsible sections (Alumni, Completed, Journal, Under review, Conf)
----------------------------------------------------------- */

.section-toggle {
  margin-top: 2rem;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  background-color: #f9fafb;
}

.section-toggle-header {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
}

.section-toggle-header h2 {
  margin: 0;
  font-size: 2.0rem;
}

.section-toggle-header .toggle-icon {
  margin-left: auto;        /* push triangle to the far right */
  font-size: 1.6rem;
  color: #6b7280;
  transition: transform 0.2s ease;
}

/* rotate icon when collapsed (Bootstrap updates aria-expanded) */
.section-toggle-header[aria-expanded="false"] .toggle-icon {
  transform: rotate(-90deg);
}

.section-toggle-header:hover {
  background-color: #e5e7eb;
}

.section-toggle-body {
  padding: 0 0.9rem 0.75rem;
}

.section-toggle-body.collapse.in {
  border-top: 1px solid #e5e7eb;
  margin-top: 0.35rem;
}

/* -----------------------------------------------------------
   Responsiveness
----------------------------------------------------------- */

@media (max-width: 768px) {
  .main-container {
    margin: 35px 12px 20px;
    padding: 24px 18px 28px;
    border-radius: 14px;
  }

.hero-img {
    width: 100%;       /* use full width on small screens */
    max-width: 100%;
    height: auto;      /* still no cropping */
  }

  .about-logo-row {
    max-width: 320px;
    gap: 1rem;
  }

  .about-logo-img {
    max-width: 140px;
    width: 45%;
  }

  .person-row {
    flex-direction: column;
  }

  .person-photo {
    max-width: 220px;
  }

  .publications-page p {
    text-indent: 0;
    padding-left: 0;
  }
}