/* ─────────────────────────────────────────────
   Theory @ Brown  —  Main Stylesheet
   Layout:  hci.cs.brown.edu
   Colors:  dhershko.github.io
   Fonts:   Lora (body) + Source Sans 3 (UI)
───────────────────────────────────────────── */

/* ── CSS Custom Properties ── */
:root {
  /* Palette — dhershko navy, warmed with amber undertones */
  --navy:       #1a2540;   /* navbar, headings — slightly warmer */
  --navy-mid:   #253560;   /* hover accents */
  --ink:        #2c2c2c;   /* body text — warm near-black */
  --ink-light:  #6b6560;   /* secondary text — warm gray */
  --cream:      #fdf8f2;   /* warm ivory page background */
  --white:      #fffefb;   /* warm white for cards */
  --warm-bg:    #f7f0e6;   /* section alternating tint */
  --rule:       #e5ddd4;   /* warm divider */
  --accent:     #3a5bd9;   /* links — warm blue */
  --accent-dim: #d6dff8;   /* soft tint */
  --amber:      #c47a2b;   /* warm accent for badges/hover */
  --amber-dim:  #faebd7;   /* warm badge background */

  --font-body:  'Lora', Georgia, 'Times New Roman', serif;
  --font-ui:    'Source Sans 3', 'Helvetica Neue', Arial, sans-serif;
  --font-mono:  'JetBrains Mono', 'Courier New', monospace;

  /* Hero photo — swap this URL for a campus photo of your choice */
  --hero-photo: url('https://upload.wikimedia.org/wikipedia/commons/0/06/Ruth_Simmons_Quad_Brown_University.jpg');
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.06rem;
  line-height: 1.8;
  padding-top: 66px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .18s;
}
a:hover { color: var(--amber); text-decoration: underline; }

h1,h2,h3,h4,h5 {
  font-family: var(--font-ui);
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -.02em;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2rem 0;
}

/* ── Navbar ── */
#mainNav {
  background: var(--navy);
  border-bottom: 3px solid var(--amber);
  padding: .85rem 0;
  transition: padding .3s, box-shadow .3s;
}

#mainNav.scrolled {
  padding: .5rem 0;
  box-shadow: 0 2px 20px rgba(20,33,61,.35);
}

.navbar-brand {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: #fff !important;
}

.nav-link {
  font-family: var(--font-ui);
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: rgba(255,255,255,.75) !important;
  padding: .4rem .9rem !important;
  transition: color .18s;
}
.nav-link:hover,
.nav-link.active { color: #fff !important; }
.nav-link.active { border-bottom: 2px solid var(--amber); }

/* ── Hero — photo with warm overlay ── */
.hero {
  position: relative;
  padding: 6rem 0 5rem;
  overflow: hidden;
  color: #fff;

  /* Layered: warm amber-navy gradient over the photo */
  background-image:
    linear-gradient(
      135deg,
      rgba(26, 37, 64, 0.88) 0%,
      rgba(90, 55, 20, 0.72) 60%,
      rgba(26, 37, 64, 0.82) 100%
    ),
    var(--hero-photo);
  background-size: 100% auto;
  background-position: center top;
}

/* Subtle grain overlay for warmth */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  pointer-events: none;
  opacity: .6;
}

.hero h1 {
  color: #fff;
  font-family: var(--font-ui);
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero .lead {
  font-family: var(--font-body);
  font-size: 1.08rem;
  font-style: italic;
  color: rgba(255,255,255,.88);
  max-width: 640px;
  line-height: 1.85;
}

.hero .dept-line {
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255, 212, 140, 0.9);   /* warm gold */
  margin-bottom: 1rem;
}

/* ── Sections ── */
.site-section {
  padding: 5rem 0;
  background: var(--cream);
}

.site-section:nth-child(even) {
  background: var(--warm-bg);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header h2 {
  font-family: var(--font-ui);
  font-size: 1.55rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: .65rem;
}

.section-header h2::after {
  content: '';
  display: inline-block;
  width: 2.2rem;
  height: 3px;
  background: var(--amber);
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Faculty / Student Grid ── */
.faculty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(155px, 1fr));
  gap: 1.4rem;
  margin-bottom: 2rem;
}

.faculty-card {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: 7px;
  overflow: hidden;
  text-align: center;
  text-decoration: none !important;
  transition: transform .2s, box-shadow .2s, border-color .2s;
  display: block;
}

.faculty-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(196, 122, 43, .15);
  border-color: var(--amber);
}

.faculty-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center 15%;
  display: block;
  background: linear-gradient(135deg, #e8dfd0 0%, #d5c9b8 100%);
}

.faculty-card .faculty-name {
  padding: .65rem .5rem .45rem;
  font-family: var(--font-ui);
  font-size: .82rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.3;
}

.faculty-card .faculty-area {
  padding: 0 .5rem .65rem;
  font-family: var(--font-body);
  font-size: .72rem;
  color: var(--ink-light);
  font-style: italic;
  line-height: 1.35;
}

/* Placeholder avatar */
.avatar-placeholder {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, #e8dfd0 0%, #d5c9b8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -.02em;
}

.faculty-note {
  font-family: var(--font-body);
  font-size: .92rem;
  color: var(--ink-light);
  font-style: italic;
  margin-top: 1rem;
  line-height: 1.75;
}
.faculty-note a { font-style: normal; color: var(--accent); }

/* ── Courses ── */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  grid-auto-rows: 1fr;
  gap: 1rem;
}

.course-item {
  display: block;
  background: var(--white);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--amber);
  border-radius: 4px;
  padding: .8rem 1rem;
  text-decoration: none !important;
  transition: box-shadow .2s, border-color .2s;
}

.course-item:hover {
  box-shadow: 0 4px 16px rgba(196, 122, 43, .12);
  border-color: var(--amber);
}

.course-item .course-code {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--amber);
  font-weight: 500;
}

.course-item .course-title {
  font-family: var(--font-ui);
  font-size: .88rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.35;
  margin-top: .1rem;
}

/* ── Seminar cards — five-up grid ── */
.seminar-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 1fr;
  gap: 1.25rem;
}

@media (max-width: 700px) {
  .seminar-cards {
    grid-template-columns: 1fr;
  }
}

.seminar-card {
  background: var(--navy);
  color: #fff;
  border-radius: 8px;
  padding: 1.4rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Subtle warm glow in top-right corner of each card */
.seminar-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 130px; height: 130px;
  background: radial-gradient(ellipse at top right, rgba(196,122,43,.28) 0%, transparent 70%);
  pointer-events: none;
}

.seminar-card h3 {
  color: #fff;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: .6rem;
  letter-spacing: -.01em;
}

.seminar-card p {
  color: rgba(255,255,255,.78);
  font-family: var(--font-body);
  font-size: .82rem;
  line-height: 1.7;
  margin-bottom: 0;
  flex-grow: 1;
}

.seminar-card p a {
  color: rgba(255, 212, 140, 0.9);
  text-decoration: underline;
  text-decoration-color: rgba(255,212,140,.4);
  text-underline-offset: 2px;
}
.seminar-card p a:hover { color: #fff; text-decoration-color: #fff; }

.seminar-card a.btn {
  align-self: flex-start;
  background: var(--amber);
  color: #fff;
  border: none;
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding: .45rem 1.1rem;
  border-radius: 3px;
  text-decoration: none !important;
  margin-top: auto;
  transition: background .18s, transform .15s;
}
.seminar-card a.btn:hover {
  background: #a8651e;
  transform: translateY(-1px);
}

/* ── FAQ / Accordion ── */
.faq-accordion .accordion-item {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: 5px !important;
  margin-bottom: .75rem;
  overflow: hidden;
}

.faq-accordion .accordion-button {
  font-family: var(--font-ui);
  font-size: .96rem;
  font-weight: 600;
  color: var(--navy);
  background: var(--white);
  box-shadow: none;
  padding: 1rem 1.25rem;
}

.faq-accordion .accordion-button:not(.collapsed) {
  color: var(--amber);
  background: #fdf5ea;
  box-shadow: none;
}

.faq-accordion .accordion-body {
  font-family: var(--font-body);
  font-size: .94rem;
  color: var(--ink);
  line-height: 1.85;
  padding: 1rem 1.25rem 1.25rem;
}

/* ── Alumni compact grid ── */
.alumni-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: .6rem;
}

.alumni-card {
  display: flex;
  align-items: center;
  gap: .65rem;
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: .65rem .7rem;
  text-decoration: none !important;
  transition: background .15s, border-color .15s, transform .15s;
}

.alumni-card:hover {
  background: #fdf5ea;
  border-color: var(--amber);
  transform: translateY(-1px);
}

.alumni-avatar {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e8dfd0 0%, #d5c9b8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: .72rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -.01em;
}

.alumni-info {
  min-width: 0;
  flex: 1;
  overflow: hidden;
}

.alumni-name {
  font-family: var(--font-ui);
  font-size: .8rem;
  font-weight: 700;
  color: var(--navy);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}

.alumni-year-line {
  margin-top: .1rem;
  line-height: 1;
}

.alumni-meta {
  font-family: var(--font-body);
  font-size: .72rem;
  color: var(--ink-light);
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: .15rem;
  line-height: 1.3;
}

.alum-year {
  font-family: var(--font-mono);
  font-size: .63rem;
  color: var(--amber);
  background: var(--amber-dim);
  padding: .05rem .32rem;
  border-radius: 3px;
  flex-shrink: 0;
  font-style: normal;
  font-weight: 500;
}

/* ── Footer ── */
.site-footer {
  background: var(--navy);
  color: rgba(255,255,255,.6);
  font-family: var(--font-ui);
  font-size: .82rem;
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 2rem;
}
.site-footer a { color: rgba(255,255,255,.7); }
.site-footer a:hover { color: #fff; text-decoration: none; }
.site-footer strong { color: rgba(255,255,255,.9); }

/* ── Responsive tweaks ── */
@media (max-width: 768px) {
  .hero { padding: 3.5rem 0 2.5rem; }
  .site-section { padding: 3rem 0; }
  .faculty-grid { grid-template-columns: repeat(auto-fill, minmax(125px, 1fr)); gap: 1rem; }
  .seminar-card { padding: 1.5rem; }
  .alumni-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  .alumni-meta { white-space: normal; overflow: visible; text-overflow: clip; }
}