:root {
  --ink: #07131f;
  --navy: #10253a;
  --blue: #246f98;
  --teal: #2b8c8b;
  --aqua: #dceff2;
  --paper: #f6f9fb;
  --surface: #ffffff;
  --muted: #607080;
  --line: #d5e1e8;
  --accent: #b46b42;
  --shadow: 0 24px 70px rgba(7, 19, 31, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 16px clamp(18px, 4vw, 56px);
  background: rgba(246, 249, 251, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
  color: var(--navy);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 10px;
  color: var(--surface);
  background: linear-gradient(135deg, var(--navy), var(--blue));
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 15px;
}

.nav-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.nav-tabs a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 7px 13px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.nav-tabs a:hover,
.nav-tabs a.active {
  color: var(--navy);
  background: var(--surface);
  border-color: var(--line);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(320px, 1.04fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  min-height: calc(100svh - 76px);
  padding: clamp(44px, 7vw, 88px) clamp(18px, 4vw, 56px) 44px;
}

.hero-copy,
.page-hero,
.portal-copy {
  max-width: 900px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(44px, 6.5vw, 86px);
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(32px, 4vw, 56px);
}

h3 {
  margin-bottom: 8px;
  font-size: 22px;
  line-height: 1.2;
}

.hero p,
.page-hero p,
.portal-copy p,
.rich-text p {
  color: var(--muted);
  font-size: clamp(17px, 1.6vw, 20px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--navy);
  border-radius: 6px;
  padding: 12px 18px;
  font-weight: 800;
  text-decoration: none;
}

.button.primary {
  color: var(--surface);
  background: var(--navy);
}

.button.primary:hover {
  background: var(--blue);
  border-color: var(--blue);
}

.button.secondary {
  color: var(--navy);
  background: transparent;
}

.button.secondary:hover {
  color: var(--surface);
  background: var(--teal);
  border-color: var(--teal);
}

.hero-image {
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(7, 19, 31, 0.14);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-image img {
  width: 100%;
  height: min(66svh, 720px);
  min-height: 360px;
  object-fit: cover;
}

.feature-band {
  padding: clamp(48px, 8vw, 96px) clamp(18px, 4vw, 56px);
  background: var(--navy);
  color: var(--surface);
}

.feature-band p {
  max-width: 1080px;
  margin: 0 auto;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(30px, 4.5vw, 62px);
  line-height: 1.12;
}

.section,
.page-hero,
.split-section,
.portal-layout {
  padding: clamp(58px, 8vw, 104px) clamp(18px, 4vw, 56px);
}

.page-hero.compact {
  padding-bottom: 24px;
}

.section-header {
  display: grid;
  grid-template-columns: minmax(150px, 0.32fr) minmax(0, 1fr);
  gap: 28px;
  margin-bottom: clamp(32px, 5vw, 58px);
}

.tile-grid,
.video-grid,
.three-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.tile-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.tile,
.video-card,
.three-columns article,
.login-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.tile {
  min-height: 260px;
  padding: 24px;
  text-decoration: none;
}

.tile:hover {
  border-color: var(--teal);
  box-shadow: 0 16px 36px rgba(7, 19, 31, 0.1);
}

.tile span {
  display: block;
  margin-bottom: 54px;
  color: var(--accent);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 28px;
  font-weight: 800;
}

.tile p,
.video-card p,
.three-columns p,
.event-row p,
.login-panel p {
  margin-bottom: 0;
  color: var(--muted);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(180px, 0.35fr) minmax(0, 1fr);
  gap: 32px;
}

.rich-text {
  max-width: 820px;
}

.muted-section {
  background: var(--aqua);
}

.three-columns article {
  padding: 28px;
}

.event-list {
  display: grid;
  gap: 14px;
}

.event-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) auto;
  align-items: center;
  gap: 22px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.event-row h2,
.video-card h2,
.login-panel h2 {
  margin-bottom: 8px;
  font-family: Inter, system-ui, sans-serif;
  font-size: 22px;
  line-height: 1.2;
}

.date-box {
  display: grid;
  min-height: 80px;
  place-items: center;
  border-radius: 6px;
  color: var(--surface);
  background: var(--blue);
  text-align: center;
}

.date-box span {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.date-box strong {
  display: block;
  margin-top: -20px;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 32px;
}

.video-card {
  overflow: hidden;
}

.video-card h2,
.video-card p {
  padding-right: 24px;
  padding-left: 24px;
}

.video-card p {
  padding-bottom: 24px;
}

.video-placeholder {
  display: grid;
  aspect-ratio: 16 / 9;
  place-items: center;
  margin-bottom: 22px;
  color: var(--surface);
  background:
    linear-gradient(135deg, rgba(16, 37, 58, 0.86), rgba(43, 140, 139, 0.82)),
    url("assets/hero-robotic-transplant.png") center / cover;
  font-weight: 800;
}

.portal-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
  min-height: calc(100svh - 142px);
}

.portal-copy .button {
  margin-top: 26px;
}

.login-panel {
  display: grid;
  gap: 16px;
  padding: 28px;
}

.login-panel label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.login-panel input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.login-panel button {
  cursor: default;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 24px clamp(18px, 4vw, 56px);
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--blue);
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-tabs {
    justify-content: flex-start;
  }

  .hero,
  .section-header,
  .split-section,
  .portal-layout {
    grid-template-columns: 1fr;
  }

  .tile-grid,
  .video-grid,
  .three-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .nav-tabs {
    width: 100%;
  }

  .nav-tabs a {
    flex: 1 1 auto;
    justify-content: center;
  }

  .hero {
    min-height: auto;
  }

  .actions,
  .button {
    width: 100%;
  }

  .tile-grid,
  .video-grid,
  .three-columns,
  .event-row {
    grid-template-columns: 1fr;
  }

  .date-box {
    width: 88px;
  }

  .site-footer {
    flex-direction: column;
  }
}