/* ============================================================
   COrgOS 2026 — Light Professional Theme
   File: docs/26_data_security/26_ds.css
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:wght@400;600;700&family=IBM+Plex+Sans:wght@300;400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* ── Variables ── */
:root {
  --bg:          #f5f7fa;
  --surface:     #ffffff;
  --border:      #dde2ea;
  --navy:        #1a2b4a;
  --blue:        #1a5fba;
  --blue-light:  #e8f0fc;
  --red:         #b91c1c;
  --red-light:   #fef2f2;
  --green:       #15803d;
  --text:        #1e293b;
  --text-muted:  #5a6a84;
  --link:        #1a5fba;
  --link-hover:  #b91c1c;
  --radius:      6px;
  --shadow:      0 1px 4px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 15px;
  background: var(--bg);
  color: var(--text);
  padding-top: 58px;
  line-height: 1.7;
}

/* ── Navigation ── */
.myNav {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--navy);
  border-bottom: 3px solid var(--blue);
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

.myNav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.55rem 1rem;
  margin: 0;
  background: transparent;
}

.myNav ul li { display: inline; }

.myNav ul li a {
  display: inline-block;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #c8d6f0;
  text-decoration: none;
  padding: 0.38rem 0.9rem;
  border-radius: var(--radius);
  transition: background 0.18s, color 0.18s;
}

.myNav ul li a:hover {
  background: var(--blue);
  color: #ffffff;
}

/* ── Main container ── */
#education { background: var(--bg) !important; }

.container.content-lg {
  max-width: 1060px;
  margin: 2rem auto;
  padding: 2.5rem 2.5rem 3rem;
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  border-radius: 10px;
  box-shadow: var(--shadow);
}

/* ── Page headings ── */
h2 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-weight: 700;
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  color: var(--navy) !important;
  text-align: center;
  letter-spacing: -0.01em;
  margin-bottom: 0.3rem;
}

h4 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--text-muted) !important;
  text-align: center;
  margin-bottom: 1rem;
}

/* ── Section headings ── */
#contentContainer h4 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--navy) !important;
  text-align: left;
  border-left: 3px solid var(--blue);
  padding-left: 0.6rem;
  margin-bottom: 0.5rem;
}

#contentContainer h2 {
  text-align: left;
  font-size: 1.35rem;
}

#contentContainer h3 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  color: var(--navy) !important;
  margin: 1.2rem 0 0.5rem;
}

/* ── HR ── */
hr {
  border: none !important;
  border-top: 1px solid var(--border) !important;
  margin: 1.2rem 0;
}

/* ── Body text ── */
#contentContainer p,
#contentContainer td,
#contentContainer li {
  color: var(--text) !important;
  font-size: 0.9rem;
}

#contentContainer strong { color: var(--navy) !important; }

/* ── Quick nav links ── */
p a[href^="#"] {
  color: var(--blue) !important;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--blue);
  transition: color 0.15s;
}
p a[href^="#"]:hover { color: var(--red) !important; border-color: var(--red); }

/* ── All links ── */
.table a,
#contentContainer a {
  color: var(--link) !important;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s;
}
.table a:hover,
#contentContainer a:hover {
  color: var(--link-hover) !important;
  text-decoration: underline;
}

/* ── Tables ── */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.87rem;
  margin-bottom: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.table thead tr,
.table thead tr[style] {
  background: var(--navy) !important;
}

.table thead th {
  color: #ffffff !important;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.65rem 0.85rem;
  border: none;
}

.table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}

.table tbody tr:nth-child(even),
tr:nth-child(even) {
  background-color: #f0f4fa !important;
}

.table tbody tr:nth-child(odd) {
  background-color: var(--surface) !important;
}

.table tbody tr:hover {
  background-color: var(--blue-light) !important;
}

.table tbody td,
.table tbody th {
  color: var(--text) !important;
  padding: 0.6rem 0.85rem;
  vertical-align: middle;
  border: none;
}

.table tbody tr th[scope="row"] {
  color: var(--text-muted) !important;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 500;
  font-size: 0.8rem;
}

/* ── Code blocks ── */
code {
  display: block;
  background: #f1f5f9;
  border-left: 3px solid var(--blue);
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  color: var(--navy) !important;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  line-height: 1.65;
  margin: 0.6rem 0;
}

/* ── Inline color overrides ── */
s { color: var(--text-muted) !important; }
span[style*="color:blue"]   { color: var(--blue) !important; }
span[style*="color:red"]    { color: var(--red) !important; }
span[style*="color:gray"]   { color: var(--text-muted) !important; }

/* ── Lists ── */
ol, ul { padding-left: 1.4rem; color: var(--text); }
ol li, ul li { margin-bottom: 0.3rem; }

/* ── Institute logo ── */
img[alt="iiser-tvm-logo"] {
  height: 60px;
  border-radius: 4px;
}

/* ── Group photo ── */
.group-photo-wrapper { text-align: center; margin: 1.5rem 0; }
.group-photo {
  max-width: 100%;
  border-radius: 8px;
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
}

/* ── Marquee tooltip ── */
#marquee {
  position: absolute;
  font-size: 12px;
  font-family: 'IBM Plex Mono', monospace;
  background: var(--navy);
  color: #ffffff;
  padding: 5px 10px;
  border-radius: 4px;
  pointer-events: none;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

/* ── Footer ── */
footer {
  background: var(--navy) !important;
  border-top: 3px solid var(--blue);
  margin-top: 3rem;
}

footer .content { background: transparent !important; padding: 1.4rem 1rem; }

footer h4 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 400;
  font-size: 0.88rem;
  color: #a0b0cc !important;
  text-align: center !important;
}

footer h4 a { color: #7ab0f0 !important; font-weight: 500; }
footer h4 a:hover { color: #ffffff !important; text-decoration: none; }

/* ── Back to top ── */
.js-back-to-top {
  background: var(--navy) !important;
  color: #ffffff !important;
  border-radius: var(--radius);
  padding: 0.4rem 0.9rem;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 0.2s;
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 999;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}
.js-back-to-top:hover { background: var(--blue) !important; }

/* ── Fade-in animation ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.container.content-lg { animation: fadeIn 0.5s ease both; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .myNav ul li a { font-size: 0.7rem; padding: 0.3rem 0.55rem; }
  .container.content-lg { padding: 1rem; margin: 0.8rem; }
  .table { font-size: 0.8rem; }
}