/* ============================================================================
   Software Engineering Research Centre - CUI Lahore
   Standalone site stylesheet.

   This site is its own IIS application and loads nothing from the main campus
   site, so there is no Bootstrap reboot and no assets/css/style.css underneath
   this file. Everything it needs, including the base element normalisation, is
   here. The `serc-` class prefixes are kept from the earlier build so the page
   markup did not have to change.
   ========================================================================== */

:root {
  --serc-navy: #10225a;
  --serc-navy-d: #0a1740;
  --serc-blue: #1f6fd0;
  --serc-teal: #0f6f77;
  --serc-gold: #f2a900;
  --serc-ink: #16203a;
  --serc-body: #3f4859;
  --serc-muted: #6b7794;
  --serc-line: #e0e5ef;
  --serc-line-2: #eef1f7;
  --serc-card: #ffffff;
  --serc-bg: #f5f7fb;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Source Sans 3', Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--serc-body);
  background: var(--serc-card);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Poppins', Arial, Helvetica, sans-serif;
  color: var(--serc-ink);
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }
img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: var(--serc-blue); text-decoration: none; }
a:hover { color: var(--serc-navy); text-decoration: underline; }
table { border-collapse: collapse; }
button { font: inherit; }
iframe { border: 0; }

.serc-wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.serc-mono { font-family: 'IBM Plex Mono', Consolas, monospace; font-size: .86em; }
.serc-label {
  font-family: 'Poppins', sans-serif; font-size: .74rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase; color: var(--serc-muted);
}
.serc-skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--serc-navy); color: #fff; padding: 12px 20px; border-radius: 0 0 8px 0;
}
.serc-skip:focus { left: 0; color: #fff; text-decoration: none; }

/* ---- Site header ---- */
.serc-header {
  background: #fff;
  border-bottom: 1px solid var(--serc-line);
  position: relative;
  z-index: 40;
}
.serc-header > .serc-wrap {
  display: flex; align-items: center; gap: 18px; min-height: 78px;
}
.serc-brand { display: flex; align-items: center; gap: 14px; margin-right: auto; }
.serc-brand:hover { text-decoration: none; }
.serc-brand img { width: 48px; height: 48px; flex: none; }
.serc-brand-txt { display: grid; }
.serc-brand-txt b {
  font-family: 'Poppins', sans-serif; font-size: 1.02rem; font-weight: 700;
  color: var(--serc-navy); line-height: 1.25; letter-spacing: -.2px;
}
.serc-brand-txt span { font-size: .82rem; color: var(--serc-muted); line-height: 1.3; }

.serc-header-links { display: flex; align-items: center; gap: 22px; }
.serc-header-links a {
  font-size: .9rem; font-weight: 600; color: var(--serc-body); white-space: nowrap;
}
.serc-header-links a:hover { color: var(--serc-blue); text-decoration: none; }
.serc-header-links a.serc-home-link {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--serc-line); border-radius: 999px; padding: 8px 16px;
}
.serc-header-links a.serc-home-link:hover { border-color: var(--serc-blue); }

.serc-burger {
  display: none; background: none; border: 1px solid var(--serc-line);
  border-radius: 8px; width: 42px; height: 42px; cursor: pointer;
  color: var(--serc-navy); align-items: center; justify-content: center;
}
.serc-burger span {
  display: block; width: 18px; height: 2px; background: currentColor;
  position: relative;
}
.serc-burger span::before, .serc-burger span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: currentColor;
}
.serc-burger span::before { top: -6px; }
.serc-burger span::after { top: 6px; }

/* ---- Hero ---- */
.serc-hero {
  position: relative;
  background: linear-gradient(105deg, var(--serc-navy-d) 0%, var(--serc-navy) 48%, #1b3f8f 100%);
  color: #fff;
  padding: 64px 0 60px;
  overflow: hidden;
}
.serc-hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.serc-hero .serc-wrap { position: relative; z-index: 1; }
.serc-crumbs { font-size: .84rem; color: #a8bce4; margin-bottom: 16px; }
.serc-crumbs a { color: #e4ecfb; font-weight: 600; }
.serc-crumbs a:hover { color: var(--serc-gold); text-decoration: none; }
.serc-eyebrow {
  display: inline-block; font-family: 'IBM Plex Mono', monospace;
  font-size: .78rem; font-weight: 500; letter-spacing: .1em; text-transform: uppercase;
  color: var(--serc-gold); border: 1px solid rgba(242,169,0,.42);
  background: rgba(242,169,0,.12); border-radius: 999px; padding: 6px 15px; margin-bottom: 18px;
}
.serc-hero h1 {
  color: #fff; font-size: clamp(2rem, 4vw, 2.85rem);
  font-weight: 800; line-height: 1.16; letter-spacing: -.4px; margin: 0 0 16px;
}
.serc-hero p.serc-lede { font-size: 1.14rem; color: #ccd9f2; max-width: 68ch; }

/* ---- Section navigation ---- */
.serc-subnav {
  background: var(--serc-bg);
  border-bottom: 1px solid var(--serc-line);
  position: sticky; top: 0; z-index: 30;
}
.serc-subnav .serc-wrap { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; }
.serc-subnav .serc-wrap::-webkit-scrollbar { display: none; }
.serc-subnav a {
  flex: none; padding: 15px 14px; font-size: .93rem; font-weight: 600;
  color: var(--serc-body); border-bottom: 3px solid transparent; white-space: nowrap;
  transition: color .2s, border-color .2s;
}
.serc-subnav a:hover { color: var(--serc-blue); text-decoration: none; }
.serc-subnav a.is-active { color: var(--serc-navy); border-bottom-color: var(--serc-gold); }

/* ---- Research-track switcher ---- */
.serc-trackbar { display: flex; flex-wrap: wrap; gap: 8px; }
.serc-trackbar a {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--serc-bg); border: 1px solid var(--serc-line); border-radius: 999px;
  padding: 8px 17px; font-family: 'Poppins', sans-serif; font-size: .87rem; font-weight: 600;
  color: var(--serc-body); transition: all .2s ease;
}
.serc-trackbar a:hover { border-color: var(--serc-blue); color: var(--serc-blue); text-decoration: none; }
.serc-trackbar a.is-active { background: var(--serc-navy); border-color: var(--serc-navy); color: #fff; }
.serc-trackbar a i { font-size: .95em; opacity: .85; }

/* ---- Page body ---- */
.serc-main { padding: 52px 0 76px; }
.serc-main > .serc-wrap { display: grid; gap: 44px; }
.serc-block { display: grid; gap: 18px; }
.serc-block > p, .serc-prose > p { max-width: 74ch; }
.serc-h2 { font-size: 1.6rem; font-weight: 700; }
.serc-h3 { font-size: 1.14rem; font-weight: 700; }
.serc-rule { border: 0; border-top: 1px solid var(--serc-line); margin: 0; }
.serc-prose { display: grid; gap: 14px; }
.serc-prose p { font-size: 1.02rem; }
.serc-sechead { display: grid; gap: 8px; max-width: 74ch; }
.serc-sechead .serc-label { color: var(--serc-teal); }

/* ---- Cards ---- */
.serc-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(262px, 1fr)); gap: 18px; }
.serc-card {
  background: var(--serc-card); border: 1px solid var(--serc-line); border-radius: 12px;
  padding: 24px; display: grid; gap: 10px; align-content: start;
  box-shadow: 0 2px 10px rgba(16,34,90,.04);
}
a.serc-card { transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
a.serc-card:hover {
  transform: translateY(-3px); border-color: rgba(31,111,208,.42);
  box-shadow: 0 14px 30px rgba(16,34,90,.12); text-decoration: none;
}
.serc-card h3 { font-size: 1.08rem; font-weight: 700; }
.serc-card p { font-size: .96rem; color: var(--serc-body); }
.serc-card .serc-more {
  font-family: 'Poppins', sans-serif; font-size: .82rem; font-weight: 600;
  color: var(--serc-blue); letter-spacing: .02em;
}
a.serc-card:hover .serc-more { color: var(--serc-navy); }
.serc-card-ico {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: rgba(31,111,208,.1); color: var(--serc-blue); font-size: 1.1rem;
}

/* ---- Stat strip ---- */
.serc-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  background: var(--serc-card); border: 1px solid var(--serc-line); border-radius: 12px;
  overflow: hidden; box-shadow: 0 6px 22px rgba(16,34,90,.07);
}
.serc-stat { padding: 22px 24px; border-right: 1px solid var(--serc-line-2); }
.serc-stat:last-child { border-right: 0; }
.serc-stat b {
  display: block; font-family: 'Poppins', sans-serif; font-size: 2rem; font-weight: 800;
  line-height: 1.05; color: var(--serc-navy); font-variant-numeric: tabular-nums;
}
.serc-stat span { font-size: .92rem; color: var(--serc-muted); }

/* ---- Topic pills ---- */
.serc-pills { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.serc-pills li {
  background: var(--serc-bg); border: 1px solid var(--serc-line); border-radius: 999px;
  padding: 7px 15px; font-size: .92rem; font-weight: 500; color: var(--serc-ink);
}

/* ---- Lists ---- */
.serc-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.serc-list li { position: relative; padding-left: 26px; font-size: 1rem; }
.serc-list li::before {
  content: ""; position: absolute; left: 4px; top: .62em; width: 8px; height: 8px;
  background: var(--serc-teal); border-radius: 2px; transform: rotate(45deg);
}

/* ---- Project entries ---- */
.serc-proj { display: grid; gap: 10px; padding: 24px 0; border-top: 1px solid var(--serc-line); }
.serc-proj:first-of-type { border-top: 0; padding-top: 4px; }
.serc-proj h3 { font-size: 1.1rem; font-weight: 700; }
.serc-proj p { font-size: 1rem; max-width: 78ch; }
.serc-byline { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: .9rem; color: var(--serc-muted); }
.serc-byline strong { color: var(--serc-ink); font-weight: 600; }

/* ---- Search + filter bar ---- */
.serc-tools {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
  padding: 16px 18px; background: var(--serc-bg);
  border: 1px solid var(--serc-line); border-radius: 12px;
  position: sticky; top: 54px; z-index: 20;
}
.serc-search { position: relative; flex: 1 1 280px; min-width: 220px; }
.serc-search i {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  color: var(--serc-muted); font-size: .9rem; pointer-events: none;
}
.serc-search input {
  width: 100%; font-family: 'Source Sans 3', sans-serif; font-size: .98rem;
  padding: 11px 14px 11px 38px; border: 1px solid var(--serc-line);
  border-radius: 8px; background: #fff; color: var(--serc-ink);
}
.serc-search input:focus {
  outline: none; border-color: var(--serc-blue); box-shadow: 0 0 0 3px rgba(31,111,208,.14);
}
.serc-filters { display: flex; flex-wrap: wrap; gap: 7px; }
button.serc-filter {
  font-family: 'Poppins', sans-serif; font-size: .84rem; font-weight: 600;
  padding: 9px 15px; border-radius: 999px; cursor: pointer;
  background: #fff; border: 1px solid var(--serc-line); color: var(--serc-body);
  transition: all .2s ease;
}
button.serc-filter:hover { border-color: var(--serc-blue); color: var(--serc-blue); }
button.serc-filter.is-on { background: var(--serc-navy); border-color: var(--serc-navy); color: #fff; }
button.serc-filter b { font-weight: 700; opacity: .65; margin-left: 4px; font-variant-numeric: tabular-nums; }
.serc-nohits { display: none; padding: 34px 0; text-align: center; color: var(--serc-muted); font-size: 1rem; }
.serc-nohits.is-on { display: block; }
.serc-group.is-hidden { display: none; }

/* ---- Collapsible abstracts ---- */
details.serc-abs { border-top: 1px solid var(--serc-line-2); padding-top: 12px; }
details.serc-abs > summary {
  cursor: pointer; list-style: none; display: inline-flex; align-items: center; gap: 8px;
  font-family: 'Poppins', sans-serif; font-size: .84rem; font-weight: 600; color: var(--serc-blue);
}
details.serc-abs > summary::-webkit-details-marker { display: none; }
details.serc-abs > summary::after {
  content: "\f078"; font-family: 'SERC Icons'; font-weight: 900; font-size: .68rem;
  transition: transform .2s ease;
}
details.serc-abs[open] > summary::after { transform: rotate(180deg); }
details.serc-abs[open] > summary { margin-bottom: 12px; }
details.serc-abs .serc-abs-body { display: grid; gap: 11px; }
details.serc-abs .serc-abs-body p { font-size: .97rem; max-width: 82ch; }

/* ---- Tables ---- */
.serc-scroll { overflow-x: auto; }
table.serc-table { width: 100%; font-size: .95rem; min-width: 520px; }
table.serc-table th, table.serc-table td {
  padding: 11px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--serc-line-2);
}
table.serc-table thead th {
  font-family: 'Poppins', sans-serif; font-size: .76rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase; color: var(--serc-muted);
  border-bottom: 1px solid var(--serc-line); background: var(--serc-bg);
}
table.serc-table tbody tr:last-child td { border-bottom: 0; }
table.serc-table .serc-num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.serc-table ol { margin: 6px 0 0; padding-left: 1.2em; }
table.serc-table ol li { margin-bottom: 4px; }
.serc-tablewrap {
  border: 1px solid var(--serc-line); border-radius: 12px; overflow: hidden; background: var(--serc-card);
}
.serc-tablewrap .serc-scroll { border-radius: 12px; }
.serc-formula { font-family: 'IBM Plex Mono', monospace; font-size: .84rem; color: var(--serc-ink); }
.serc-formula em { display: block; font-style: normal; color: var(--serc-muted); margin-top: 5px; font-size: .95em; }

/* ---- Document links ---- */
.serc-docs { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
a.serc-doc {
  display: flex; align-items: center; gap: 13px; padding: 13px 15px;
  border: 1px solid var(--serc-line); border-radius: 10px; background: var(--serc-card);
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
a.serc-doc:hover {
  border-color: rgba(31,111,208,.45); box-shadow: 0 8px 20px rgba(16,34,90,.1);
  transform: translateY(-2px); text-decoration: none;
}
.serc-tag {
  flex: none; width: 40px; height: 40px; border-radius: 9px; display: grid; place-items: center;
  font-family: 'Poppins', sans-serif; font-size: .62rem; font-weight: 700; letter-spacing: .04em;
  background: rgba(176,54,44,.09); color: #b0362c;
}
.serc-tag.is-data { background: rgba(15,111,119,.1); color: var(--serc-teal); }
.serc-doc-txt { min-width: 0; }
.serc-doc-txt b { display: block; font-size: .96rem; font-weight: 600; color: var(--serc-ink); line-height: 1.4; }
a.serc-doc:hover .serc-doc-txt b { color: var(--serc-blue); }
.serc-doc-txt span { display: block; font-size: .8rem; color: var(--serc-muted); margin-top: 2px; letter-spacing: .02em; }

/* ---- People ---- */
.serc-people { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.serc-person {
  display: flex; gap: 14px; align-items: center; padding: 18px;
  border: 1px solid var(--serc-line); border-radius: 12px; background: var(--serc-card);
}
.serc-avatar {
  flex: none; width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(140deg, var(--serc-navy), var(--serc-blue)); color: #fff;
  font-family: 'Poppins', sans-serif; font-weight: 700; font-size: .95rem;
}
.serc-person b { display: block; font-size: 1rem; color: var(--serc-ink); font-weight: 600; }
.serc-person span { font-size: .87rem; color: var(--serc-muted); }
.serc-person.is-lead .serc-avatar { background: linear-gradient(140deg, #8a5c00, var(--serc-gold)); }

/* ---- Callout ---- */
.serc-callout {
  background: var(--serc-bg); border-left: 4px solid var(--serc-blue);
  border-radius: 10px; padding: 20px 24px; display: grid; gap: 8px;
}
.serc-callout h3 { font-size: 1.05rem; }
.serc-callout p { font-size: .98rem; }

/* ---- Buttons ---- */
.serc-btnrow { display: flex; flex-wrap: wrap; gap: 12px; }
a.serc-btn {
  display: inline-flex; align-items: center; gap: 9px;
  background: var(--serc-blue); color: #fff;
  font-family: 'Poppins', sans-serif; font-weight: 600; font-size: .94rem;
  padding: 12px 24px; border-radius: 8px; border: 1px solid transparent;
  box-shadow: 0 4px 14px rgba(31,111,208,.22); transition: all .25s ease;
}
a.serc-btn:hover { background: var(--serc-navy); transform: translateY(-2px); color: #fff; text-decoration: none; }
a.serc-btn.is-ghost {
  background: transparent; color: var(--serc-navy);
  border-color: var(--serc-line); box-shadow: none;
}
a.serc-btn.is-ghost:hover { background: var(--serc-bg); border-color: var(--serc-blue); color: var(--serc-navy); }

/* ---- Figures ---- */
.serc-figure {
  border: 1px solid var(--serc-line); border-radius: 12px; padding: 20px;
  background: var(--serc-card); display: grid; gap: 12px; justify-items: center; margin: 0;
}
.serc-figure figcaption { font-size: .86rem; color: var(--serc-muted); text-align: center; }

/* ---- References ---- */
ol.serc-refs { margin: 0; padding-left: 1.6em; display: grid; gap: 9px; font-size: .93rem; }
ol.serc-refs li { color: var(--serc-body); }
ol.serc-refs li::marker { color: var(--serc-muted); font-variant-numeric: tabular-nums; }

/* ---- Footer ---- */
.serc-footer {
  background: var(--serc-navy-d); color: #b9c6e2; padding: 52px 0 26px; margin-top: 0;
  font-size: .94rem;
}
.serc-footer a { color: #dbe5f7; }
.serc-footer a:hover { color: var(--serc-gold); text-decoration: none; }
.serc-footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 40px;
  padding-bottom: 34px; border-bottom: 1px solid rgba(255,255,255,.12);
}
.serc-footer h4 {
  font-size: .78rem; font-weight: 600; letter-spacing: .13em; text-transform: uppercase;
  color: #fff; margin-bottom: 14px;
}
.serc-footer-brand { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 16px; }
.serc-footer-brand img { width: 46px; height: 46px; flex: none; }
.serc-footer-brand b {
  display: block; font-family: 'Poppins', sans-serif; font-size: 1rem; color: #fff; line-height: 1.35;
}
.serc-footer-brand span { font-size: .84rem; color: #9db0d4; }
.serc-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.serc-footer-legal {
  padding-top: 20px; display: flex; flex-wrap: wrap; gap: 8px 24px;
  justify-content: space-between; font-size: .86rem; color: #8fa2c6;
}

@media (max-width: 900px) {
  .serc-footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .serc-footer-grid > div:first-child { grid-column: 1 / -1; }
}

@media (max-width: 820px) {
  .serc-burger { display: inline-flex; }
  .serc-header-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--serc-line);
    box-shadow: 0 14px 26px rgba(16,34,90,.12);
  }
  .serc-header-links.is-open { display: flex; }
  .serc-header-links a { padding: 14px 24px; border-top: 1px solid var(--serc-line-2); }
  .serc-header-links a.serc-home-link { border: 0; border-top: 1px solid var(--serc-line-2); border-radius: 0; }
  .serc-hero { padding: 44px 0 44px; }
  .serc-main { padding: 36px 0 60px; }
  .serc-main > .serc-wrap { gap: 34px; }
  .serc-stat { border-right: 0; border-bottom: 1px solid var(--serc-line-2); }
  .serc-stat:last-child { border-bottom: 0; }
  .serc-tools { position: static; }
  .serc-footer-legal { justify-content: flex-start; }
}