@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:wght@400;600;700;800&family=Source+Serif+4:wght@600;700&display=swap');

:root {
  --cu-red-700: #bb1219;
  --cu-red-600: #e91c24;
  --cu-red-50: #fde9e9;
  --cu-black-900: #191919;
  --cu-black-800: #333333;
  --cu-black-700: #4d4d4d;
  --cu-black-300: #b3b3b3;
  --cu-black-200: #cccccc;
  --cu-black-100: #e6e6e6;
  --cu-black-50: #f2f2f2;
  --surface: #ffffff;
  --maxw: 1180px;
  --radius: 14px;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Source Sans 3", "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  color: var(--cu-black-800);
  background: #fafafa;
}

a {
  color: var(--cu-red-700);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6rem;
  line-height: 1.2;
  color: var(--cu-black-900);
}

h1,
h2 {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
}

p {
  margin: 0 0 1rem;
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  background: var(--cu-black-50);
  border: 1px solid var(--cu-black-100);
  border-radius: 6px;
  padding: 0.05rem 0.35rem;
  font-size: 0.9em;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  background: #fff;
  padding: 8px 12px;
  border: 2px solid var(--cu-red-600);
  z-index: 999;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(var(--maxw), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: #fff;
  border-top: 2px solid var(--cu-red-600);
  border-bottom: 1px solid var(--cu-black-100);
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.brand-logo {
  width: 150px;
  height: auto;
}

.brand-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cu-black-800);
  line-height: 1.2;
}

.brand-subtitle {
  display: block;
  color: var(--cu-black-600);
  font-size: 0.9rem;
  font-weight: 600;
}

.utility {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--cu-black-300);
  border-radius: 8px;
  background: #fff;
  color: var(--cu-black-900);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle .sr-only {
  width: 1px;
  height: 1px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid transparent;
  min-height: 36px;
  padding: 0 1rem;
  transition: transform 120ms ease, background-color 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-red {
  background: var(--cu-red-600);
  color: #fff;
}

.btn-red:hover {
  background: var(--cu-red-700);
}

.btn-black {
  background: var(--cu-black-900);
  color: #fff;
}

.btn-disabled {
  opacity: 0.7;
  cursor: default;
  pointer-events: none;
}

.site-nav {
  border-top: 1px solid var(--cu-black-100);
  background: var(--cu-black-50);
}

.site-nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  gap: 0.1rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.15rem 0.95rem;
  color: var(--cu-black-700);
  font-weight: 700;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--cu-red-700);
  border-bottom-color: var(--cu-red-600);
  text-decoration: none;
}

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(0, 0, 0, 0.76), rgba(0, 0, 0, 0.24));
}

.hero-inner {
  position: relative;
  padding: 5.8rem 0 4.8rem;
}

.hero-home {
  background: url('assets/download.jpeg') center/cover no-repeat;
}

.hero-sub {
  background: linear-gradient(120deg, #20232a, #434a57);
}

.hero-program {
  background: url('assets/brainHero.jpeg') center/cover no-repeat;
}

.hero-curriculum {
  background: url('assets/chipHero.jpeg') center/cover no-repeat;
}

.hero-program,
.hero-curriculum {
  background-position: center 30%;
}

.hero-program::before,
.hero-curriculum::before {
  background: linear-gradient(120deg, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0.34));
}

.hero-electives {
  background: url('assets/instruments.jpeg') center/cover no-repeat;
}

.hero-summer {
  background: url('assets/fibersHero.jpeg') center/cover no-repeat;
}

.hero-labs {
  background: url('assets/happyLab.jpg') center/cover no-repeat;
}

.eyebrow {
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.86rem;
  opacity: 0.9;
}

.hero h1 {
  color: #fff;
  font-size: clamp(2rem, 5.2vw, 3.35rem);
  max-width: 16ch;
}

.hero p {
  max-width: 64ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.1rem;
}

.btn-light {
  background: #fff;
  color: var(--cu-black-900);
}

.btn-ghost {
  background: transparent;
  border-color: #fff;
  color: #fff;
}

.section {
  padding: 2.6rem 0;
}

.section-tight {
  padding: 1.1rem 0;
}

.section h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

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

.card {
  background: var(--surface);
  border: 1px solid var(--cu-black-100);
  border-radius: var(--radius);
  padding: 1.05rem 1.05rem 0.95rem;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.kicker {
  color: var(--cu-black-600);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.8rem;
  font-weight: 800;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
}

.metric {
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--cu-black-100);
  padding: 0.9rem 0.9rem 0.8rem;
}

.metric a {
  display: block;
  color: inherit;
  text-decoration: none;
}

.metric strong {
  display: block;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--cu-red-700);
}

.metric span {
  font-size: 0.9rem;
  color: var(--cu-black-700);
}

.callout {
  background: linear-gradient(135deg, #fff, #fff7f7);
  border: 1px solid #f5cbce;
  border-left: 5px solid var(--cu-red-600);
  border-radius: 10px;
  padding: 1rem;
}

.breadcrumb {
  margin: 1.15rem 0 0;
  font-size: 0.92rem;
  color: var(--cu-black-600);
}

.breadcrumb a {
  color: var(--cu-black-700);
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--cu-black-100);
  border-radius: 12px;
  background: #fff;
}

.academic-layout {
  display: grid;
  grid-template-columns: minmax(220px, 290px) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.academic-sidebar {
  position: sticky;
  top: 126px;
  background: #fff;
  border: 1px solid var(--cu-black-100);
  border-radius: 10px;
  padding: 1rem;
}

.academic-sidebar h2 {
  font-size: 1.22rem;
}

.academic-sidebar h3 {
  margin-top: 1rem;
  font-size: 1.02rem;
}

.academic-sidebar p {
  font-size: 0.95rem;
  margin-bottom: 0.8rem;
}

.academic-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.academic-nav li {
  border-top: 1px solid var(--cu-black-100);
}

.academic-nav li:first-child {
  border-top: none;
}

.academic-nav a {
  display: block;
  padding: 0.48rem 0;
  color: var(--cu-black-800);
  font-weight: 600;
}

.academic-content {
  min-width: 0;
}

.academic-block {
  margin-bottom: 2rem;
}

.academic-block h2 {
  margin-bottom: 0.6rem;
}

.academic-block p {
  max-width: 78ch;
}

.media-wide {
  margin: 1rem 0 1.2rem;
}

.media-16x9 {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #111;
}

.lab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.lab-jump a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 0.9rem;
  border-radius: 999px;
  border: 1px solid #efb7ba;
  background: #fff7f7;
  color: var(--cu-red-700);
  font-weight: 700;
  font-size: 0.93rem;
  text-decoration: none;
}

.lab-jump a:hover {
  background: var(--cu-red-50);
}

.lab-facts .card {
  border-top: 4px solid var(--cu-red-600);
}

.media-grid {
  align-items: start;
}

.media-frame {
  margin: 0 0 0.8rem;
  border: 1px solid var(--cu-black-100);
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
}

.media-frame img,
.media-frame video {
  display: block;
  width: 100%;
  height: auto;
}

.media-16x9 img,
.media-16x9 video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-caption {
  margin: 0;
  padding: 0.65rem 0.75rem;
  font-size: 0.88rem;
  color: var(--cu-black-700);
  background: var(--cu-black-50);
  border-top: 1px solid var(--cu-black-100);
}

.tree-page {
  padding-top: 1.8rem;
}

.tree-guide {
  margin-top: 0.7rem;
  margin-bottom: 1rem;
}

.tree-guide ol {
  margin: 0.4rem 0 0.75rem 1.1rem;
  padding: 0;
}

.tree-guide li {
  margin-bottom: 0.45rem;
}

.tree-frame-wrap {
  margin-top: 0.8rem;
  background: #fff;
  border: 1px solid var(--cu-black-100);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tree-frame {
  display: block;
  width: 100%;
  min-height: 520px;
  height: clamp(520px, 72vh, 920px);
  border: 0;
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  border-bottom: 1px solid var(--cu-black-100);
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cu-black-700);
  background: var(--cu-black-50);
}

.timeline {
  display: grid;
  gap: 0.85rem;
}

.timeline-item {
  background: #fff;
  border: 1px solid var(--cu-black-100);
  border-left: 5px solid var(--cu-red-600);
  border-radius: 10px;
  padding: 0.85rem 1rem;
}

.timeline-item h3 {
  margin-bottom: 0.2rem;
}

.foot {
  margin-top: 1.8rem;
  padding: 1.5rem 0 2.4rem;
  border-top: 1px solid var(--cu-black-100);
  color: var(--cu-black-700);
  font-size: 0.95rem;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr;
  gap: 1rem;
}

.foot h4 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.muted {
  color: var(--cu-black-600);
}

@media (max-width: 900px) {
  .header-main {
    gap: 0.7rem;
  }

  .utility {
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .js-ready .site-nav {
    display: none;
  }

  .js-ready .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .site-nav a {
    width: 100%;
    border-bottom: 1px solid var(--cu-black-100);
    border-left: 3px solid transparent;
  }

  .site-nav a:hover,
  .site-nav a.active {
    border-bottom-color: var(--cu-black-100);
    border-left-color: var(--cu-red-600);
  }
}

@media (max-width: 980px) {
  .grid-3,
  .grid-4,
  .metrics,
  .foot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .academic-layout {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .academic-sidebar {
    position: static;
  }

  .header-main {
    flex-wrap: wrap;
    padding: 0.5rem 0;
  }
}

@media (max-width: 700px) {
  body {
    font-size: 17px;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .metrics,
  .foot-grid {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    padding: 3.6rem 0 3.2rem;
  }

  .brand-logo {
    width: 126px;
  }
}