:root {
  --bg: #f6f7f3;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: #ffffff;
  --ink: #1a2d4b;
  --muted: #53677f;
  --line: #e8e3d5;
  --brand: #003594;
  --brand-deep: #002a74;
  --brand-soft: #fdf4d7;
  --accent: #ffb81c;
  --accent-soft: rgba(255, 184, 28, 0.12);
  --shadow: 0 18px 40px rgba(0, 30, 80, 0.08);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background:
    radial-gradient(circle at top left, rgba(0, 53, 148, 0.08), transparent 22%),
    radial-gradient(circle at bottom right, rgba(255, 184, 28, 0.1), transparent 20%),
    linear-gradient(180deg, #f7f8f6 0%, #fbfaf7 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(
      120deg,
      rgba(255, 184, 28, 0.03),
      rgba(255, 184, 28, 0.03) 2px,
      transparent 2px,
      transparent 22px
    );
}

.assignment-shell {
  position: relative;
  max-width: 1180px;
  margin: 32px auto 64px;
  padding: 0 18px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  padding: 28px 28px 22px;
  border-radius: 22px 22px 0 0;
  background: linear-gradient(135deg, var(--brand-deep) 0%, var(--brand) 52%, #0f64d8 100%);
  box-shadow: var(--shadow);
  color: white;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.86;
}

h1 {
  margin: 0;
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  line-height: 1.2;
}

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

.mini-nav a {
  color: var(--brand-deep);
  background: linear-gradient(180deg, #fff8df 0%, var(--accent) 100%);
  border: 1px solid rgba(255, 184, 28, 0.9);
  padding: 8px 12px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
}

.mini-nav a:hover {
  background: linear-gradient(180deg, #ffe7a4 0%, #f7bf3a 100%);
}

.content {
  display: block;
  background: rgba(255,255,255,0.82);
  border: 1px solid var(--line);
  border-top: none;
  border-radius: 0 0 22px 22px;
  box-shadow: var(--shadow);
  padding: 26px 22px 30px;
  backdrop-filter: blur(2px);
}

.meta-card,
.assignment-body,
.assignment-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px 18px;
}

.meta-card h2,
.assignment-body h2,
.assignment-card h2,
.assignment-card h3 {
  margin-top: 0;
}

.meta-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.meta-card li + li {
  margin-top: 8px;
}

.assignment-body {
  background: linear-gradient(180deg, rgba(255, 248, 220, 0.28), rgba(255,255,255,0.85));
  border-color: rgba(255, 184, 28, 0.25);
  max-width: none;
  width: 100%;
  padding: 24px 26px;
}

.assignment-body p,
.assignment-body li {
  color: var(--ink);
}

.assignment-body a,
.assignment-card a {
  color: var(--brand);
}

.assignment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.assignment-card h3 {
  margin-bottom: 10px;
  font-size: 1.15rem;
}

.assignment-card p,
.assignment-card ul {
  margin: 0 0 12px;
  color: var(--muted);
}

.assignment-card ul {
  padding-left: 18px;
}

.protein-motif {
  position: relative;
  margin-top: 18px;
  height: 88px;
  border-radius: 16px;
  background:
    linear-gradient(90deg, rgba(31,90,138,0.08), rgba(124,192,231,0.18)),
    rgba(255,255,255,0.55);
  border: 1px solid var(--line);
  overflow: hidden;
}

.protein-motif::before,
.protein-motif::after {
  content: "";
  position: absolute;
  left: 6%;
  right: 6%;
  top: 50%;
  height: 18px;
  transform: translateY(-50%);
  border-radius: 999px;
  background: linear-gradient(90deg, transparent 0%, rgba(31,90,138,0.32) 12%, rgba(31,90,138,0.7) 35%, rgba(124,192,231,0.9) 52%, rgba(31,90,138,0.7) 68%, rgba(31,90,138,0.32) 88%, transparent 100%);
  box-shadow: inset 0 0 0 1px rgba(20,61,99,0.15);
}

.protein-motif::after {
  top: 68%;
  opacity: 0.6;
}

@media (max-width: 760px) {
  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .assignment-body {
    padding: 18px 18px;
  }
}