:root {
  --page: #087b98;
  --page-deep: #006f8c;
  --ink: #17212a;
  --muted: #667985;
  --surface: #ffffff;
  --surface-soft: #f4f8fa;
  --field: #eaf3f6;
  --line: #d7e3e7;
  --accent: #00799b;
  --accent-dark: #005f79;
  --notice: #fff7da;
  --notice-line: #e3bf4f;
  --shadow: 0 20px 55px rgba(8, 63, 80, 0.18);
  --radius-large: 24px;
  --radius-medium: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 15% 5%, rgba(255, 255, 255, 0.12), transparent 28rem),
    linear-gradient(145deg, var(--page), var(--page-deep));
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.page-width {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1rem;
  min-height: 76px;
}

.brand {
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}

.back-link {
  padding: 0.55rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease;
}

.back-link:hover,
.back-link:focus-visible {
  background: #ffffff;
  color: var(--accent-dark);
}

main {
  padding-block: 48px 72px;
}

.hero {
  padding: clamp(28px, 5vw, 56px);
  border-radius: var(--radius-large);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.hero__intro {
  max-width: 760px;
  margin: 1.4rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.schedule-note {
  display: inline-block;
  margin: 1.5rem 0 0;
  padding: 0.55rem 0.8rem;
  border-radius: 10px;
  background: var(--field);
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 700;
}

.programme-nav {
  position: sticky;
  z-index: 5;
  top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  width: fit-content;
  max-width: 100%;
  margin: 28px auto 0;
  padding: 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 999px;
  background: rgba(0, 89, 112, 0.88);
  box-shadow: 0 12px 30px rgba(0, 45, 60, 0.2);
  backdrop-filter: blur(12px);
}

.programme-nav a {
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 750;
  text-decoration: none;
}

.programme-nav a:hover,
.programme-nav a:focus-visible {
  background: #ffffff;
  color: var(--accent-dark);
}

.programme-section {
  scroll-margin-top: 100px;
  margin-top: 32px;
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-large);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.programme-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 0.25rem 1rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.programme-heading .eyebrow {
  grid-column: 1 / -1;
}

.programme-heading h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3.5vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.programme-heading > p:last-child {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.course-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.course-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-medium);
  background: var(--surface-soft);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.course-card:hover,
.course-card[open] {
  border-color: #a9cbd5;
  box-shadow: 0 10px 28px rgba(16, 68, 83, 0.1);
}

.course-card > summary {
  position: relative;
  display: grid;
  gap: 0.65rem;
  padding: clamp(20px, 3vw, 28px) clamp(48px, 6vw, 70px) clamp(20px, 3vw, 28px)
    clamp(20px, 3vw, 28px);
  cursor: pointer;
  list-style: none;
}

.course-card > summary::-webkit-details-marker {
  display: none;
}

.course-card > summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: clamp(18px, 3vw, 28px);
  display: grid;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--field);
  color: var(--accent-dark);
  font-size: 1.45rem;
  font-weight: 500;
  line-height: 1;
  place-items: center;
  transform: translateY(-50%);
}

.course-card[open] > summary::after {
  content: "-";
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.course-meta span,
.course-badge {
  width: fit-content;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  background: var(--field);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
}

.course-badge {
  background: var(--notice);
  color: #765600;
}

.course-title {
  max-width: 900px;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.course-directors {
  max-width: 900px;
  color: var(--muted);
  font-size: 0.93rem;
}

.summary-action {
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 800;
}

.course-card[open] .summary-action {
  display: none;
}

.course-description {
  padding: 0 clamp(20px, 3vw, 28px) clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
  background: #ffffff;
  color: #31434d;
}

.course-description p {
  max-width: 880px;
  margin: 1.25rem 0 0;
}

.course-description h3 {
  max-width: 880px;
  margin: 1.5rem 0 0.35rem;
  color: var(--ink);
  font-size: 1rem;
}

.course-description h3 + p {
  margin-top: 0;
}

.course-description ul {
  max-width: 850px;
  margin: 0.75rem 0 0;
  padding-left: 1.35rem;
}

.course-description li + li {
  margin-top: 0.55rem;
}

.language-notice,
.application-notice {
  max-width: 880px;
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--notice-line);
  border-radius: 10px;
  background: var(--notice);
  color: #5e4908;
  font-weight: 650;
}

.application-notice {
  border-left-color: var(--accent);
  background: var(--field);
  color: var(--accent-dark);
}

.site-footer {
  padding: 0 0 36px;
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .page-width {
    width: min(100% - 20px, 1120px);
  }

  .site-header__inner {
    min-height: 68px;
  }

  .brand {
    max-width: 170px;
    line-height: 1.2;
  }

  .back-link {
    padding: 0.45rem 0.65rem;
    font-size: 0.78rem;
  }

  main {
    padding-block: 20px 42px;
  }

  .hero,
  .programme-section {
    border-radius: 16px;
  }

  .programme-nav {
    position: static;
    justify-content: center;
    width: 100%;
    border-radius: 16px;
  }

  .programme-heading {
    grid-template-columns: 1fr;
  }

  .programme-heading > p:last-child {
    margin-top: 0.3rem;
  }

  .course-card > summary {
    padding-right: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}