/* HackHPC design system — see HackHPC_Brand_Guide_2026.md */

:root {
  --primary-blue: #0277FA;
  --secondary-cyan: #06A1FC;
  --dark-blue: #022292;
  --ui-blue: #0954C7;
  --accent-orange: #FD741E;
  --support-sky: #8CC2E7;
  --neutral-ink: #111827;
  --neutral-white: #FFFFFF;
  --soft-gray: #F4F8FC;
  --line-gray: #D9E4F0;

  --font-sans: Inter, Arial, Helvetica, sans-serif;
  --font-mono: 'Liberation Mono', 'Roboto Mono', Consolas, monospace;

  --max-width: 1180px;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(2, 34, 146, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--neutral-ink);
  background: var(--neutral-white);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }

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

h1, h2, h3, h4 { font-family: var(--font-sans); color: var(--dark-blue); line-height: 1.2; margin: 0 0 0.6em; }
h1 { font-weight: 800; font-size: clamp(2.1rem, 4vw, 3.2rem); }
h2 { font-weight: 700; font-size: clamp(1.6rem, 3vw, 2.1rem); }
h3 { font-weight: 700; font-size: 1.3rem; color: var(--ui-blue); }
p { margin: 0 0 1em; }

code, .mono { font-family: var(--font-mono); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: 4rem 0; }
.section--tight { padding: 2.5rem 0; }
.section--soft { background: var(--soft-gray); }
.section--dark {
  background: linear-gradient(135deg, var(--dark-blue) 0%, var(--secondary-cyan) 60%, var(--primary-blue) 100%);
  color: var(--neutral-white);
}
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--neutral-white); }

.eyebrow {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--accent-orange);
  margin-bottom: 0.5rem;
  display: block;
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn-primary { background: var(--accent-orange); color: var(--neutral-white); }
.btn-primary:hover { background: #e5650f; transform: translateY(-1px); }
.btn-secondary { background: var(--neutral-white); color: var(--dark-blue); border-color: var(--neutral-white); }
.btn-secondary:hover { background: transparent; color: var(--neutral-white); }
.btn-outline { background: transparent; color: var(--ui-blue); border-color: var(--ui-blue); }
.btn-outline:hover { background: var(--ui-blue); color: var(--neutral-white); }
.btn-small { padding: 0.45rem 1rem; font-size: 0.85rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 1.75rem; }

/* Nav */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--neutral-white);
  border-bottom: 1px solid var(--line-gray);
}
.navbar { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 0; }
.navbar-logo img { height: 40px; }
.navbar-menu { display: flex; align-items: center; gap: 1.6rem; }
.navbar-menu a {
  font-weight: 500; color: var(--neutral-ink); font-size: 0.95rem;
}
.navbar-menu a:hover, .navbar-menu a.active { color: var(--ui-blue); text-decoration: none; }
.navbar-menu .btn { margin-left: 0.25rem; }

.hamburger {
  display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 0.4rem;
}
.hamburger span { width: 24px; height: 2.5px; background: var(--dark-blue); border-radius: 2px; }

@media (max-width: 860px) {
  .hamburger { display: flex; }
  .navbar-menu {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--neutral-white);
    flex-direction: column; align-items: flex-start;
    gap: 0; padding: 0.5rem 0;
    border-bottom: 1px solid var(--line-gray);
    box-shadow: var(--shadow);
    display: none;
  }
  .navbar-menu.active { display: flex; }
  .navbar-menu a { width: 100%; padding: 0.85rem 1.5rem; }
  .navbar-menu .btn { margin: 0.5rem 1.5rem; }
}

/* Hero */
.hero { padding: 4.5rem 0 3.5rem; }
.hero-content { max-width: 760px; }
.hero .tagline { font-size: 1.15rem; opacity: 0.95; max-width: 640px; }

/* Metrics */
.metrics-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.25rem; margin-top: 2rem;
}
.metric-card {
  background: var(--neutral-white); border: 1px solid var(--line-gray);
  border-radius: var(--radius); padding: 1.5rem 1rem; text-align: center;
}
.metric-value { font-family: var(--font-sans); font-weight: 800; font-size: 2.2rem; color: var(--accent-orange); }
.metric-label { font-size: 0.9rem; color: var(--dark-blue); font-weight: 500; margin-top: 0.25rem; }

/* Pillars / cards grid */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; }
.card {
  background: var(--neutral-white); border: 1px solid var(--line-gray);
  border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow);
}
.card--soft { background: var(--soft-gray); border: none; box-shadow: none; }
.pillar-icon { font-size: 1.8rem; margin-bottom: 0.75rem; }

/* Events */
.filters {
  display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 2rem;
  align-items: center;
}
.filters input[type="search"], .filters select {
  font-family: var(--font-sans); padding: 0.6rem 0.9rem; border-radius: 8px;
  border: 1px solid var(--line-gray); background: var(--neutral-white); font-size: 0.95rem;
}
.filters input[type="search"] { flex: 1 1 220px; }
.results-count { font-size: 0.9rem; color: #4b5563; margin-bottom: 1rem; }

.events-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.event-card, .course-card { display: flex; flex-direction: column; gap: 0.5rem; }
.event-card .event-date, .course-card .event-date { font-size: 0.85rem; color: var(--ui-blue); font-weight: 600; }
.course-card .card-links { margin-top: auto; display: flex; gap: 0.6rem; flex-wrap: wrap; padding-top: 0.75rem; align-items: center; }
.badge {
  display: inline-block; font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; padding: 0.2rem 0.6rem; border-radius: 999px;
  background: var(--support-sky); color: var(--dark-blue); width: fit-content;
}
.badge-hackathon { background: #DCEBFF; color: var(--ui-blue); }
.badge-codeathon { background: #FFE3D1; color: #B84B0F; }
.badge-faculty { background: #E4D9FB; color: #5B2FB8; }
.badge-training { background: #D8F5E3; color: #147041; }
.badge-doi { background: var(--accent-orange); color: var(--neutral-white); font-size: 0.65rem; padding: 0.1rem 0.45rem; margin-left: 0.3rem; }
.badge-award { background: var(--accent-orange); color: var(--neutral-white); font-size: 0.65rem; padding: 0.1rem 0.45rem; margin-left: 0.3rem; }
.partner-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.25rem; }
.partner-tag { font-size: 0.75rem; background: var(--soft-gray); border: 1px solid var(--line-gray); border-radius: 6px; padding: 0.15rem 0.5rem; color: var(--neutral-ink); }
.event-card .card-links { margin-top: auto; display: flex; gap: 0.6rem; flex-wrap: wrap; padding-top: 0.75rem; align-items: center; }
.repo-link { display: inline-flex; align-items: center; gap: 0.3rem; }
.teams-toggle { margin-top: 0.6rem; border-top: 1px solid var(--line-gray); padding-top: 0.6rem; }
.teams-toggle summary { cursor: pointer; font-size: 0.8rem; font-weight: 600; color: var(--ui-blue); }
.teams-toggle summary:hover { text-decoration: underline; }
.team-list { list-style: none; margin: 0.6rem 0 0; padding: 0; display: flex; flex-direction: column; gap: 0.4rem; }
.team-item {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem;
  font-size: 0.82rem; background: var(--soft-gray); border-radius: 8px; padding: 0.4rem 0.65rem;
}
.team-name { font-weight: 600; color: var(--neutral-ink); }
.team-award { font-size: 0.75rem; color: #9a5b00; }
.team-repo { margin-left: auto; font-size: 0.78rem; display: inline-flex; align-items: center; gap: 0.3rem; white-space: nowrap; }
.no-results { display: none; padding: 2rem; text-align: center; color: #4b5563; }

/* Partner icons */
.partner-icon {
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0; border-radius: 10px; background: var(--neutral-white);
  border: 1px solid var(--line-gray); overflow: hidden;
}
.partner-icon img { width: 100%; height: 100%; object-fit: contain; padding: 4px; }
.partner-icon .fa-brands { color: var(--ui-blue); font-size: 55%; }
.partner-icon-fallback {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-sans); font-weight: 800; color: var(--neutral-white);
  background: linear-gradient(135deg, var(--dark-blue), var(--secondary-cyan));
  font-size: 1.1em;
}
.partner-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.partner-header h3, .partner-header-name { margin: 0; }

/* Partner strip */
.partner-strip-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin-top: 2rem;
}
.partner-strip-grid .partner-name { font-weight: 600; color: var(--dark-blue); font-size: 0.95rem; }

/* School grid */
.school-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0.6rem; }
.school-item {
  display: flex; align-items: center; gap: 0.6rem; background: var(--neutral-white);
  border: 1px solid var(--line-gray); border-radius: 8px; padding: 0.5rem 0.7rem; color: var(--neutral-ink);
}
.school-item:hover { border-color: var(--ui-blue); text-decoration: none; background: var(--soft-gray); }
.school-name { font-size: 0.85rem; font-weight: 500; line-height: 1.25; }

/* Citations / research list */
.citation-list { display: flex; flex-direction: column; gap: 1.25rem; }
.citation-item {
  padding: 1.25rem 1.5rem; background: var(--neutral-white);
  border: 1px solid var(--line-gray); border-radius: var(--radius);
}
.citation-title { font-weight: 700; color: var(--dark-blue); font-size: 1.05rem; margin-bottom: 0.25rem; }
.citation-meta { font-size: 0.9rem; color: #4b5563; margin-bottom: 0.6rem; }
.citation-summary { font-size: 0.92rem; color: var(--neutral-ink); line-height: 1.6; margin: 0 0 0.85rem; }
.citation-authors { font-weight: 500; }
.citation-links { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.citation-links a {
  font-size: 0.82rem; font-weight: 600; color: var(--ui-blue);
  background: var(--soft-gray); border-radius: 999px; padding: 0.25rem 0.75rem;
}
.citation-links a:hover { background: var(--support-sky); text-decoration: none; }
.cite-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.75rem; padding-top: 0.75rem; border-top: 1px solid var(--line-gray); }
.cite-buttons .cite-label { font-size: 0.78rem; color: #4b5563; align-self: center; margin-right: 0.15rem; }
.cite-btn {
  font-family: var(--font-sans); font-weight: 600; font-size: 0.78rem;
  background: var(--neutral-white); color: var(--ui-blue); border: 1px solid var(--ui-blue);
  border-radius: 999px; padding: 0.3rem 0.85rem; cursor: pointer;
}
.cite-btn:hover { background: var(--ui-blue); color: var(--neutral-white); }

/* Citation modal */
.citation-modal-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(2, 34, 146, 0.55);
  z-index: 1000; align-items: center; justify-content: center; padding: 1.5rem;
}
.citation-modal-backdrop.open { display: flex; }
.citation-modal {
  background: var(--neutral-white); border-radius: var(--radius); max-width: 640px; width: 100%;
  max-height: 85vh; overflow-y: auto; padding: 1.75rem; position: relative; box-shadow: var(--shadow);
}
.citation-modal-close {
  position: absolute; top: 1rem; right: 1rem; background: none; border: none;
  font-size: 1.5rem; line-height: 1; cursor: pointer; color: #4b5563; padding: 0.25rem 0.5rem;
}
.citation-modal-close:hover { color: var(--dark-blue); }
.citation-modal h3 { margin-bottom: 0.25rem; padding-right: 2rem; }
.citation-modal-source { font-size: 0.85rem; color: #4b5563; margin-bottom: 1.25rem; }
.citation-modal-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.citation-tab {
  font-family: var(--font-sans); font-weight: 700; font-size: 0.85rem;
  padding: 0.4rem 1rem; border-radius: 999px; border: 1px solid var(--line-gray);
  background: var(--soft-gray); color: var(--dark-blue); cursor: pointer;
}
.citation-tab.active { background: var(--dark-blue); color: var(--neutral-white); border-color: var(--dark-blue); }
.citation-modal-text {
  font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.6; white-space: pre-wrap;
  word-break: break-word; background: var(--soft-gray); border-radius: 8px; padding: 1rem;
  margin: 0 0 1.25rem; max-height: 320px; overflow-y: auto; color: var(--neutral-ink);
}
.citation-modal-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.citation-modal-actions button {
  font-family: var(--font-sans); font-weight: 700; font-size: 0.85rem;
  border-radius: 999px; padding: 0.5rem 1.1rem; cursor: pointer; border: 2px solid transparent;
}
#citationCopyBtn { background: var(--accent-orange); color: var(--neutral-white); }
#citationShareBtn, #citationDownloadBtn { background: transparent; color: var(--ui-blue); border-color: var(--ui-blue); }
#citationShareBtn:hover, #citationDownloadBtn:hover { background: var(--ui-blue); color: var(--neutral-white); }
.citation-modal-status { font-size: 0.8rem; color: #147041; margin-top: 0.6rem; min-height: 1.2em; }

/* Tables (FAQ / resources) */
.faq-item { border-bottom: 1px solid var(--line-gray); padding: 1.25rem 0; }
.faq-item h3 { margin-bottom: 0.4rem; }

/* Organizers */
.organizer-card { scroll-margin-top: 6rem; }
.organizer-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.5rem; }
.organizer-photo { width: 72px; height: 72px; border-radius: 50%; object-fit: cover; flex-shrink: 0; border: 2px solid var(--line-gray); }
.organizer-header h3 { margin-bottom: 0.15rem; }
.organizer-affiliation { font-weight: 600; color: var(--ui-blue); margin: 0; display: flex; align-items: center; gap: 0.4rem; }
.organizer-affiliation-icon { border-radius: 4px; object-fit: contain; }
.organizer-links { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.organizer-links a {
  display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.82rem; font-weight: 600;
  color: var(--ui-blue); background: var(--soft-gray); border: 1px solid var(--line-gray);
  border-radius: 999px; padding: 0.35rem 0.85rem;
}
.organizer-links a:hover { background: var(--support-sky); text-decoration: none; }

/* Footer */
.site-footer { background: var(--dark-blue); color: var(--neutral-white); padding: 3rem 0 1.5rem; margin-top: 4rem; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 2rem; }
.footer-grid h4 { color: var(--secondary-cyan); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.9rem; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 0.5rem; }
.footer-grid a { color: #E0EAFB; }
.footer-grid a:hover { color: var(--neutral-white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15); margin-top: 2.5rem; padding-top: 1.5rem;
  font-size: 0.85rem; color: #B9CBEF; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }

/* Horizontal branching timeline */
.timeline-h-hint { text-align: center; margin: 0 0 0.25rem; }
.timeline-h-scroll {
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  padding: 0.5rem 0 1.5rem; margin: 0 -1.5rem; padding-left: 1.5rem; padding-right: 1.5rem;
}
.timeline-h {
  display: grid; grid-auto-flow: column; grid-auto-columns: minmax(148px, auto);
  grid-template-rows: minmax(64px, auto) auto minmax(64px, auto);
  min-width: max-content;
}
.timeline-h-year { display: contents; }
.timeline-h-stem {
  display: flex; flex-direction: column; align-items: center; gap: 0.4rem; padding: 0 0.6rem;
}
.timeline-h-stem--up { justify-content: flex-end; padding-bottom: 0.5rem; }
.timeline-h-stem--down { justify-content: flex-start; padding-top: 0.5rem; }
.timeline-h-branch {
  font-family: var(--font-sans); font-size: 0.72rem; font-weight: 600; text-align: center;
  color: var(--ui-blue); background: var(--soft-gray); border: 1px solid var(--line-gray);
  border-radius: 6px; padding: 0.3rem 0.55rem; line-height: 1.3; max-width: 140px;
}
.timeline-h-branch:hover { background: var(--support-sky); text-decoration: none; }
.timeline-h-node {
  position: relative; display: flex; flex-direction: column; align-items: center;
  border-top: 3px solid var(--line-gray); padding-top: 0.7rem;
}
.timeline-h-dot {
  position: absolute; top: -8px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent-orange); border: 2px solid var(--neutral-white);
  box-shadow: 0 0 0 2px var(--accent-orange);
}
.timeline-h-year-label {
  font-family: var(--font-sans); font-weight: 800; font-size: 0.95rem; color: var(--accent-orange);
}

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.stack { display: flex; flex-direction: column; gap: 1rem; }
.divider { height: 1px; background: var(--line-gray); border: none; margin: 3rem 0; }
.small { font-size: 0.85rem; color: #4b5563; }