:root {
  --bg: #f7f6f2;
  --paper: #fffefb;
  --text: #1e2329;
  --muted: #5e6670;
  --brand: #004e89;
  --brand-2: #ff6b35;
  --border: #d8d3c6;
  --shadow: 0 12px 30px rgba(0, 28, 53, 0.12);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% -10%, rgba(255, 107, 53, 0.2), transparent 45%),
    radial-gradient(circle at 100% 5%, rgba(0, 78, 137, 0.2), transparent 45%),
    var(--bg);
  line-height: 1.6;
}

.bg-orb {
  position: fixed;
  z-index: -1;
  width: 20rem;
  height: 20rem;
  border-radius: 50%;
  filter: blur(45px);
  opacity: 0.35;
}

.bg-orb-left {
  background: #ffd9c8;
  top: 10rem;
  left: -8rem;
}

.bg-orb-right {
  background: #bfdfff;
  right: -8rem;
  top: 20rem;
}

.container {
  width: min(1050px, 92vw);
  margin: 0 auto;
}

.hero {
  padding: 1.25rem 0 2.5rem;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  background: rgba(255, 254, 251, 0.75);
  backdrop-filter: blur(6px);
  border-radius: 999px;
  margin-top: 1rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--brand);
  text-decoration: none;
}

.nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.nav a:hover {
  color: var(--brand);
}

.campus-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem 0.45rem;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid var(--border);
  transition: transform 180ms ease;
}

.campus-mark:hover {
  transform: translateY(-1px);
}

.campus-mark img {
  display: block;
  height: 24px;
  width: auto;
}

.hero-content {
  padding: 4rem 0 2rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand);
  font-weight: 700;
  margin: 0;
}

h1,
h2,
h3 {
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  margin: 0.35rem 0 1rem;
}

.lead {
  max-width: 65ch;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  border-radius: 999px;
  padding: 0.6rem 1rem;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
}

.button-primary {
  background: var(--brand);
  color: #ffffff;
}

.button-primary:hover {
  background: #003f70;
}

.button-ghost {
  border-color: var(--brand);
  color: var(--brand);
}

.button-ghost:hover {
  background: rgba(0, 78, 137, 0.08);
}

.button-inline {
  margin-top: 0.5rem;
  background: var(--brand-2);
  color: #ffffff;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.4rem;
  margin: 1rem 0 1.25rem;
}

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

.chip-row {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.chip {
  text-decoration: none;
  border: 1px dashed var(--brand);
  color: var(--brand);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(0, 78, 137, 0.05);
}

.chip:hover {
  background: rgba(0, 78, 137, 0.12);
}

.muted {
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.6rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef4fa;
}

.link-list {
  margin: 0;
  padding-left: 1.2rem;
}

.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0 2.5rem;
  color: var(--muted);
  flex-wrap: wrap;
}

.footer a {
  color: var(--brand);
  text-decoration: none;
}

.footer-sponsor {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.footer-sponsor img {
  height: 18px;
  width: auto;
  display: block;
}

.reveal {
  animation: rise 700ms ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .nav {
    border-radius: var(--radius);
    flex-direction: column;
    align-items: flex-start;
  }

  .campus-mark {
    align-self: flex-end;
  }

  .campus-mark img {
    height: 20px;
  }

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

  .hero-content {
    padding-top: 2.25rem;
  }
}

/* Causal inference module timeline */
.timeline {
  list-style: none;
  margin: 0.5rem 0 1.5rem;
  padding: 0 0 0 1.5rem;
  border-left: 2px solid var(--border);
}

.timeline-item {
  position: relative;
  padding: 0.25rem 0 1rem 0.75rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 7px);
  top: 0.55rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--brand);
}

.timeline-item p {
  margin: 0.15rem 0;
}

.timeline-date {
  font-weight: 700;
  color: var(--brand);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.timeline-title {
  font-weight: 600;
}

.timeline-item.is-done {
  color: var(--muted);
}

.timeline-item.is-done .timeline-date {
  color: var(--muted);
}

.timeline-item.is-done::before {
  background: var(--muted);
  border-color: var(--muted);
}

.timeline-item.is-current {
  background: rgba(255, 107, 53, 0.08);
  border: 1px solid rgba(255, 107, 53, 0.45);
  border-radius: 12px;
  padding: 0.6rem 0.75rem;
  margin: 0.25rem 0 1rem;
}

.timeline-item.is-current::before {
  background: var(--brand-2);
  border-color: var(--brand-2);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.25);
  top: 0.9rem;
}

.timeline-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #ffffff;
  background: var(--brand-2);
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
}

.timeline-status {
  font-weight: 600;
  color: var(--brand);
}

.note {
  margin-top: 1rem;
  padding: 0.25rem 1rem 0.5rem;
  border-left: 4px solid var(--brand);
  background: rgba(0, 78, 137, 0.05);
  border-radius: 0 12px 12px 0;
}

.note h3 {
  margin-bottom: 0.25rem;
}

/* Outline: merged module cell */
td.module-cell {
  vertical-align: middle;
  background: rgba(255, 107, 53, 0.06);
  border-left: 3px solid var(--brand-2);
}

.module-cell p {
  margin: 0 0 0.4rem;
}

.module-cell-title {
  font-weight: 700;
  color: var(--brand);
}

.module-cell-link {
  font-weight: 600;
  color: var(--brand);
}

/* Module: "Now / This week" block */
.now-block {
  margin: 0.5rem 0 1.25rem;
  padding: 0.75rem 1rem 1rem;
  border: 1px solid rgba(255, 107, 53, 0.45);
  border-radius: 12px;
  background: rgba(255, 107, 53, 0.06);
}

.now-label {
  display: inline-block;
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #ffffff;
  background: var(--brand-2);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
}

.now-block.is-complete .now-label {
  background: var(--muted);
}

.now-phase + .now-phase {
  margin-top: 0.85rem;
}

.now-phase-title {
  margin: 0 0 0.45rem;
  font-weight: 700;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.6rem;
}

.now-dates {
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--muted);
}

.chip-locked {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag-lock {
  flex: none;
}

.chip-note {
  font-size: 0.8rem;
  color: var(--muted);
}

/* Module: step cards */
.step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.step-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  background: var(--paper);
  scroll-margin-top: 1rem;
}

.step-card:target {
  border-color: var(--brand-2);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2);
}

.step-card h4 {
  font-family: "Source Serif 4", Georgia, serif;
  margin: 0 0 0.35rem;
  color: var(--brand);
}

.step-card p,
.step-card ul {
  margin: 0.35rem 0;
}

.step-card ul {
  padding-left: 1.2rem;
}

.study-code-reminder {
  margin: 1rem 0 0;
  padding: 0.5rem 0.75rem;
  border-left: 4px solid var(--brand-2);
  background: rgba(255, 107, 53, 0.06);
  border-radius: 0 12px 12px 0;
}

@media (max-width: 760px) {
  .step-grid {
    grid-template-columns: 1fr;
  }
}