/* Upskill AI Oxford — dark, professional theme */

:root {
  /* Palette: #061429, #182F55, #4C5C8A, #B8A6E3, #F6F3FF */
  --bg: #061429;
  --bg-elevated: #182f55;
  --border: #4c5c8a;
  --text: #f6f3ff;
  --text-muted: #8a96b8;
  --accent: #b8a6e3;
  --accent-hover: #c9baec;
  --accent-contrast: #061429;
  --header-bg: #121f38;
  --header-text: #f6f3ff;
  --header-text-muted: #c5c0d8;
  --header-border: rgba(76, 92, 138, 0.45);
  --header-hover-bg: rgba(246, 243, 255, 0.08);
  --radius: 3px;
  --container: 1080px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  border-bottom: none;
  box-shadow: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
  padding-left: 16px;
  padding-right: 24px;
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  margin-right: 12px;
}

.brand-logo {
  height: 64px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  gap: 8px;
}

.site-header .nav-link {
  padding: 8px 14px;
  border-radius: 10px;
  color: var(--header-text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.18s ease, background 0.18s ease;
}

.site-header .nav-link:hover {
  color: var(--header-text);
  background: var(--header-hover-bg);
}

.site-header .nav-link.active {
  color: var(--header-text);
  background: var(--header-hover-bg);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn-primary {
  background: linear-gradient(180deg, #d7c8f3 0%, var(--accent) 100%);
  color: var(--accent-contrast);
  box-shadow: 0 8px 22px rgba(184, 166, 227, 0.32);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #e6dcf8 0%, var(--accent-hover) 100%);
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(184, 166, 227, 0.45);
}

.btn-secondary {
  background: rgba(246, 243, 255, 0.04);
  color: var(--text);
  border: 1px solid rgba(184, 166, 227, 0.5);
}

.btn-secondary:hover {
  background: rgba(184, 166, 227, 0.14);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 110px 0 90px;
  border-bottom: 1px solid rgba(76, 92, 138, 0.45);
  background:
    radial-gradient(520px 240px at 18% 30%, rgba(184, 166, 227, 0.16), transparent 70%),
    linear-gradient(180deg, #121f38 0%, var(--bg) 96px),
    var(--bg);
}

.hero-kicker {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-sub {
  max-width: 620px;
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-committee {
  display: none;
}

/* ---------- Sections ---------- */

.section {
  padding: 80px 0;
  border-bottom: 1px solid rgba(76, 92, 138, 0.45);
}

.section:last-of-type {
  border-bottom: none;
}

.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-sub {
  color: var(--text-muted);
  margin-bottom: 36px;
}

.section-title + .card-grid {
  margin-top: 36px;
}

/* ---------- Cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  width: 100%;
  counter-reset: card;
}

.card {
  position: relative;
  background:
    linear-gradient(180deg, rgba(184, 166, 227, 0.1), transparent 88px),
    var(--bg-elevated);
  border: 1px solid rgba(76, 92, 138, 0.85);
  border-radius: 14px;
  padding: 24px 24px 26px;
  box-shadow: 0 10px 28px rgba(6, 20, 41, 0.18);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.card::before {
  counter-increment: card;
  content: counter(card, decimal-leading-zero);
  display: block;
  margin-bottom: 22px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

@media (hover: hover) {
  .card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(6, 20, 41, 0.28);
  }
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---------- Committee ---------- */

.committee-section .section-sub {
  margin-bottom: 28px;
}

.committee-scroll {
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  padding: 6px max(24px, calc((100% - var(--container)) / 2 + 24px)) 18px;
}

.committee-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.committee-track {
  display: flex;
  gap: 16px;
  width: max-content;
}

.committee-card {
  flex: 0 0 min(280px, calc(100vw - 48px));
  scroll-snap-align: center;
  background: var(--bg-elevated);
  border: 1px solid rgba(76, 92, 138, 0.85);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(6, 20, 41, 0.18);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

@media (hover: hover) {
  .committee-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(6, 20, 41, 0.28);
  }
}

.committee-photo {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center top;
  display: block;
  background: var(--border);
}

.committee-card h3 {
  padding: 16px 16px 4px;
  font-size: 1.05rem;
  font-weight: 600;
}

.committee-card .member-role {
  padding: 0 16px 18px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ---------- Join ---------- */

.join-section {
  text-align: center;
}

.join-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 36px;
  background:
    linear-gradient(180deg, rgba(184, 166, 227, 0.12), transparent 140px),
    var(--bg-elevated);
  border: 1px solid rgba(76, 92, 138, 0.85);
  border-radius: 14px;
  box-shadow: 0 10px 28px rgba(6, 20, 41, 0.18);
}

.join-inner h2 {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.join-inner p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ---------- Term card page ---------- */

.page-header {
  position: relative;
  padding: 80px 0 50px;
  border-bottom: 1px solid rgba(76, 92, 138, 0.45);
  background:
    radial-gradient(520px 220px at 18% 40%, rgba(184, 166, 227, 0.16), transparent 70%),
    linear-gradient(180deg, #121f38 0%, var(--bg) 80px),
    var(--bg);
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}

.tbd-card {
  max-width: 520px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.tbd-label {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}

.tbd-card p:last-child {
  color: var(--text-muted);
}

.event-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 820px;
}

.event {
  display: flex;
  gap: 24px;
  background:
    linear-gradient(180deg, rgba(184, 166, 227, 0.08), transparent 72px),
    var(--bg-elevated);
  border: 1px solid rgba(76, 92, 138, 0.85);
  border-radius: 14px;
  padding: 22px 24px;
  box-shadow: 0 10px 28px rgba(6, 20, 41, 0.18);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

@media (hover: hover) {
  .event:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 16px 36px rgba(6, 20, 41, 0.28);
  }
}

.event-date {
  flex-shrink: 0;
  width: 110px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.event-week {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.event-day {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.event-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.event-signup {
  color: var(--accent);
}

.event-signup-title {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.event-signup-action {
  display: inline-block;
  margin-left: 10px;
  padding: 3px 10px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: rgba(184, 166, 227, 0.12);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  text-transform: uppercase;
  vertical-align: 2px;
}

.event-signup:hover {
  color: var(--accent-hover);
}

.event-signup:hover .event-signup-action {
  border-color: var(--accent-hover);
}

.event-body p.event-meta {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0;
}

.event-body p:last-child {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid rgba(76, 92, 138, 0.45);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent);
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    gap: 12px;
    padding: 18px 16px 14px;
  }

  .brand {
    margin-right: 0;
    justify-content: center;
    width: 100%;
  }

  .brand-logo {
    height: auto;
    width: min(220px, 68vw);
  }

  .site-nav {
    display: none;
  }

  .hero,
  .page-header {
    text-align: center;
    padding: 56px 0 48px;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-committee {
    display: inline-flex;
  }

  .section {
    padding: 56px 0;
  }

  .section-title,
  .section-sub {
    text-align: center;
  }

  .card,
  .committee-card h3,
  .committee-card .member-role {
    text-align: center;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .join-inner {
    padding: 36px 22px;
  }

  .footer-inner {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }

  .event {
    flex-direction: column;
    gap: 10px;
  }

  .event-date {
    flex-direction: row;
    width: auto;
    gap: 12px;
    align-items: baseline;
  }
}