/* ============================================================
   SIKHA PENTYALA — Academic Site
   Blue/warm tone, Lora + Source Sans 3
   ============================================================ */

:root {
  --ink:          #1a1a2e;
  --muted:        #4a4a62;
  --subtle:       #888899;
  --accent:       #2c5f8a;
  --accent-dark:  #1e4266;
  --accent-light: #e8f0f7;
  --accent2:      #b85c38;
  --accent2-light:#fdf0eb;
  --green:        #2d7a4f;
  --green-light:  #e8f5ee;
  --purple:       #5c5fa6;
  --purple-light: #efeff8;
  --bg:           #fafaf8;
  --card:         #ffffff;
  --border:       #e4e4e4;
  --serif:        'Lora', Georgia, serif;
  --sans:         'Source Sans 3', sans-serif;
  --nav-h:        56px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

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

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

/* ── NAVBAR ─────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(250,250,248,0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 2rem;
}
.nav-inner {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }
.nav-links {
  display: flex;
  list-style: none;
  gap: 0;
}
.nav-links li a {
  display: block;
  padding: 0 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
  line-height: var(--nav-h);
}
.nav-links li a:hover,
.nav-links li a.active { color: var(--accent); }
.nav-links li a.active {
  box-shadow: inset 0 -2px 0 var(--accent);
}

/* ── LAYOUT ──────────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem;
}
.page-content {
  padding: 3rem 0 5rem;
}

/* ── SECTION HEADINGS ────────────────────────────────────── */
.section-title {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-light);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.section-title i { color: var(--accent); font-size: 1.1rem; }

.section-block { margin-bottom: 3rem; }

/* ── HERO (index) ────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 3rem;
  align-items: start;
  padding: 3.5rem 0 2.5rem;
}
.hero-photo .photo-wrap {
  width: 175px;
  height: 175px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--accent-light);
  box-shadow: 0 4px 24px rgba(44,95,138,0.13);
  background: linear-gradient(135deg, var(--accent-light), #d0e4f5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  color: var(--accent);
}
.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
}

.hero-content h1 {
  font-family: var(--serif);
  font-size: 2.3rem;
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: 0.3rem;
}
.hero-role {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.15rem;
}
.hero-affil {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1.3rem;
}
.hero-bio {
  font-size: 0.97rem;
  color: #2e2e3e;
  max-width: 580px;
  margin-bottom: 1.3rem;
}
.hero-bio p + p { margin-top: 0.75rem; }

/* icon links row */
.icon-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.4rem;
}
.icon-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.38rem 0.9rem;
  border: 1.5px solid var(--accent);
  border-radius: 2rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  transition: all 0.18s;
}
.icon-link:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}
.icon-link i { font-size: 0.78rem; }

/* research interest tags */
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  display: inline-block;
  padding: 0.18rem 0.7rem;
  border-radius: 2rem;
  font-size: 0.78rem;
  font-weight: 600;
}
.tag-blue  { background: var(--accent-light); color: var(--accent); }
.tag-orange{ background: var(--accent2-light); color: var(--accent2); }
.tag-green { background: var(--green-light);   color: var(--green); }

/* ── NEWS ────────────────────────────────────────────────── */
.news-list { display: flex; flex-direction: column; gap: 0.55rem; }
.news-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 1rem;
  font-size: 0.9rem;
  align-items: baseline;
}
.news-date {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
}

/* ── BADGES ──────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 0.08rem 0.48rem;
  border-radius: 3px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 0.3rem;
  vertical-align: middle;
}
.badge-blue   { background: var(--accent-light);  color: var(--accent); }
.badge-orange { background: var(--accent2-light); color: var(--accent2); }
.badge-green  { background: var(--green-light);   color: var(--green); }
.badge-gray   { background: #efefef; color: var(--muted); }

/* ── PUBLICATIONS ────────────────────────────────────────── */
.pub-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.4rem;
}
.filter-btn {
  padding: 0.28rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 2rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--card);
  cursor: pointer;
  transition: all 0.18s;
  font-family: var(--sans);
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
.filter-btn--blue:hover,   .filter-btn--blue.active   { border-color: var(--accent);  color: var(--accent);  background: var(--accent-light);  }
.filter-btn--orange:hover, .filter-btn--orange.active  { border-color: var(--accent2); color: var(--accent2); background: var(--accent2-light); }

.pub-list { display: flex; flex-direction: column; gap: 0; }
.pub-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.pub-card:hover {
  box-shadow: 0 3px 18px rgba(44,95,138,0.09);
  border-color: #c5d9ec;
}
.pub-card--plain {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 0.65rem 0;
  margin-bottom: 0;
}
.pub-card--plain:hover { box-shadow: none; }
.pub-card--plain:last-child { border-bottom: none; }
.pub-venue {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 0.22rem;
}
.pub-title {
  font-family: var(--serif);
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
  margin-bottom: 0.28rem;
}
.pub-authors {
  font-size: 0.845rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}
.pub-authors strong { color: var(--ink); font-weight: 700; }
.pub-title-row {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin-bottom: 0.28rem;
}
.pub-title-row .pub-title  { flex: 1; min-width: 0; margin-bottom: 0; }
.pub-title-row .pub-links  { flex-shrink: 0; padding-top: 0.18rem; }
.pub-links { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.pub-btn {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 0.13rem 0.52rem;
  border: 1px solid var(--accent);
  border-radius: 3px;
  transition: all 0.16s;
}
.pub-btn:hover { background: var(--accent); color: #fff; text-decoration: none; }
.pub-btn.orange { color: var(--accent2); border-color: var(--accent2); }
.pub-btn.orange:hover { background: var(--accent2); color: #fff; }

.pub-section-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 700;
  margin: 0 0 0.6rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}

/* ── RESEARCH AREAS ──────────────────────────────────────── */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2.5rem;
}
.research-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 8px;
  padding: 1.3rem;
}
.research-card.orange  { border-top-color: var(--accent2); }
.research-card.green   { border-top-color: var(--green); }
.research-card.purple  { border-top-color: var(--purple); }

/* ── RESEARCH DIRECTION PANELS (research.html) ─────────── */
.dir-list { display: flex; flex-direction: column; gap: 0; }

.dir-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}
.dir-card:last-child { margin-bottom: 0; }

.dir-card--green  { border-left-color: var(--green); }
.dir-card--orange { border-left-color: var(--accent2); }
.dir-card--purple { border-left-color: var(--purple); }

.dir-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}
.dir-head h3 {
  margin: 0;
  font-size: 1.05rem;
  font-family: var(--serif);
  color: var(--ink);
}

.dir-motivation {
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.7;
  margin-bottom: 0.6rem;
}

.dir-rq-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.dir-rq-list {
  margin: 0 0 0.75rem 1.1rem;
  padding: 0;
  font-size: 0.875rem;
  color: var(--ink);
  line-height: 1.6;
}
.dir-rq-list li { margin-bottom: 0.2rem; }

.dir-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.dir-link {
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
.dir-link:hover { color: var(--accent); }

/* ── V2: TWO-COLUMN DIRECTION ROWS ──────────────────────── */
.dir-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.5rem 2rem;
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}
.dir-row:first-child { border-top: 1px solid var(--border); }

.dir-row-left { padding-top: 0.15rem; }

.dir-row-icon {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}
.dir-row-left h3 {
  font-size: 1rem;
  font-family: var(--serif);
  color: var(--ink);
  margin: 0 0 0.5rem;
}

@media (max-width: 640px) {
  .dir-row { grid-template-columns: 1fr; gap: 0.5rem; }
  .dir-row:first-child { border-top: none; }
}

.research-card h3 {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--ink);
}
.research-card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 0.7rem;
}
.research-card .tag { margin-bottom: 0.3rem; }

/* ── TALKS / AWARDS / SERVICE lists ─────────────────────── */
.two-col-list {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0.5rem 1rem;
  font-size: 0.9rem;
  align-items: baseline;
}
.two-col-list .yr {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  white-space: nowrap;
}
.two-col-list + .two-col-list { margin-top: 0.5rem; }

/* ── TEACHING ────────────────────────────────────────────── */
.course-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.course-table th {
  text-align: left;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 700;
  padding: 0.4rem 0.75rem;
  border-bottom: 2px solid var(--border);
}
.course-table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.course-table tr:last-child td { border-bottom: none; }
.course-table .role-cell { color: var(--accent); font-weight: 600; font-size: 0.85rem; }

.mentee-list { display: flex; flex-direction: column; gap: 0.55rem; }
.mentee-bullet-list {
  list-style: disc;
  padding-left: 1.3rem;
  font-size: 0.92rem;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  line-height: 1.6;
}
.mentee-row {
  display: grid;
  grid-template-columns: 1fr 140px 120px;
  gap: 1rem;
  font-size: 0.88rem;
  align-items: center;
  padding: 0.55rem 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.mentee-name { font-weight: 600; color: var(--ink); }
.mentee-meta { color: var(--muted); font-size: 0.82rem; }
.mentee-note { font-size: 0.8rem; }

.philosophy-box {
  background: var(--accent-light);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.3rem;
  font-size: 0.92rem;
  color: #2a3a4a;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

/* ── SERVICE PAGE LISTS ──────────────────────────────────── */
.service-list {
  list-style: disc;
  padding-left: 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.65;
}
.service-meta {
  color: var(--muted);
  font-size: 0.83rem;
}
.service-subhead {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

/* ── PRE-PHD NOTE ────────────────────────────────────────── */
.hero-prev {
  font-size: 0.87rem;
  color: var(--muted);
  margin-top: 0.5rem;
  line-height: 1.6;
}

/* ── PUBLICATIONS WITH THUMBNAILS ────────────────────────── */
.pub-card--thumb {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1rem;
  align-items: start;
}
.pub-thumb {
  width: 80px;
  height: 80px;
  border-radius: 6px;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--accent);
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}
.pub-thumb img {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
}
.pub-tags-row { margin: 0.3rem 0 0.2rem; }

/* ── AWARDS ──────────────────────────────────────────────── */
.award-list { display: flex; flex-direction: column; gap: 0.7rem; }
.award-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 0.8rem 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
}
.award-icon { font-size: 1.3rem; line-height: 1.2; flex-shrink: 0; }
.award-name { font-weight: 700; color: var(--ink); }
.award-detail { font-size: 0.82rem; color: var(--muted); margin-top: 0.1rem; }

/* ── PROJECT CARDS ───────────────────────────────────────── */
.proj-list { display: flex; flex-direction: column; gap: 0.75rem; }
.proj-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1.25rem;
  transition: box-shadow 0.2s;
}
.proj-card:hover { box-shadow: 0 3px 14px rgba(44,95,138,0.09); }
.proj-card--blue   { border-left-color: var(--accent); }
.proj-card--orange { border-left-color: var(--accent2); }
.proj-card--green  { border-left-color: var(--green); }
.proj-card--plain {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 0.85rem 0;
}
.proj-card--plain:hover { box-shadow: none; }
.proj-card--plain:last-child { border-bottom: none; }
.proj-header {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin-bottom: 0.3rem;
  flex-wrap: wrap;
}
.proj-title {
  font-family: var(--serif);
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}
.proj-desc {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}
.proj-meta {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.4rem;
}
.proj-section-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 700;
  margin: 1.6rem 0 0.8rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}
.proj-section-label:first-of-type { margin-top: 0; }

/* ── RESEARCH DETAILS CARDS (accordion) ─────────────────── */
.rdc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}
.rdc[open] {
  box-shadow: 0 3px 18px rgba(44,95,138,0.08);
  border-color: #c5d9ec;
}
.rdc > summary {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 1.1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.rdc > summary::-webkit-details-marker { display: none; }
.rdc > summary::marker { display: none; }
.rdc > summary:hover { background: var(--accent-light); }
.rdc-bar {
  width: 4px;
  min-height: 1.8rem;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--accent);
  margin-top: 0.3rem;
  align-self: stretch;
}
.rdc-bar--orange { background: var(--accent2); }
.rdc-bar--green  { background: var(--green); }
.rdc-summary-body { flex: 1; min-width: 0; }
.rdc-title {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.3rem;
}
.rdc-blurb {
  font-size: 0.87rem;
  color: var(--muted);
  line-height: 1.55;
  margin-bottom: 0.6rem;
}
.rdc-chevron {
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--muted);
  align-self: center;
  margin-left: 0.5rem;
  transition: transform 0.2s;
}
.rdc[open] .rdc-chevron { transform: rotate(90deg); }
.rdc-body {
  padding: 1rem 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
}
.rdc-projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: 0.6rem;
}
.rdc-proj-head {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

/* ── FOOTER ──────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 1.8rem 2rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--subtle);
}
footer a { color: var(--accent); }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 680px) {
  .hero { grid-template-columns: 1fr; gap: 1.5rem; }
  .hero-photo { display: flex; justify-content: center; }
  .news-row { grid-template-columns: 1fr; gap: 0.15rem; }
  .two-col-list { grid-template-columns: 60px 1fr; }
  .mentee-row { grid-template-columns: 1fr; }
  .nav-links li a { padding: 0 0.6rem; font-size: 0.75rem; }
  .research-grid { grid-template-columns: 1fr; }
  .pub-card--thumb { grid-template-columns: 1fr; }
  .pub-thumb { width: 100%; height: 56px; border-radius: 4px; }
  .rdc-projects-grid { grid-template-columns: 1fr; gap: 0.9rem; }
}