/*
  Colors: #fcfafa (bg) · #c8d3d5 (accent) · #0B161E (text/dark)
*/

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #0B161E;
  background: #fcfafa;
}

/* ── Header ──────────────────────────────── */
header {
  background: #f5f5f5; /* #c8d3d5;*/
  color: #0B161E;
  padding: 1rem 2rem;
  text-align: center;
  border-bottom: 1px solid rgba(11, 22, 30, 0.12);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.header-text {
  flex: 1;
}

.header-logo {
  flex-shrink: 0;
  margin-right: 2.5rem;
  width: 100px;
  height:100px;
  border: none;/* dashed #c8d3d5;*/
  border-radius: 6px;
  background: #ffffff;
  overflow: hidden;
}

.header-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.course-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(11, 22, 30, 0.5);
  margin-bottom: 0.5rem;
}

header h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
  color: #0B161E;
}

.term {
  font-size: 0.95rem;
  color: rgba(11, 22, 30, 0.55);
}

.instructor {
  margin-top: 0.3rem;
  font-size: 0.95rem;
  color: #0B161E;
  font-weight: 600;
}

/* ── Nav ─────────────────────────────────── */
nav {
  background: #fcfafa;
  display: flex;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid #c8d3d5;
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
}

nav a {
  color: #0B161E;
  text-decoration: none;
  padding: 0.85rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  display: block;
  transition: background 0.2s, color 0.2s;
}

nav a:hover {
  background: #0B161E;
  color: #fcfafa;
}

/* ── Main ────────────────────────────────── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

section {
  margin-bottom: 3.5rem;
}

section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #0B161E;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  display: inline-block;
}

section p {
  color: rgba(11, 22, 30, 0.75);
  margin-bottom: 0.8rem;
}

/* ── Overview images ─────────────────────── */
.overview-images {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.25rem;
}

.overview-image-placeholder {
  aspect-ratio: 4 / 3;
  background: #ffffff;
  border: 1px dashed #c8d3d5;
  border-radius: 6px;
  overflow: hidden;
}

.overview-image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.overview-image figcaption {
  margin-top: 0.4rem;
  text-align: center;
}

.overview-image figcaption a {
  font-size: 0.78rem;
  color: rgba(11, 22, 30, 0.5);
  text-decoration: none;
}

.overview-image figcaption a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .overview-images { grid-template-columns: 1fr; }
}

/* ── Table — borderless, left-accent hover ── */
table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
}

thead {
  background: transparent;
  border-bottom: 2px solid #c8d3d5;
}

th {
  padding: 0.6rem 1rem;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(11, 22, 30, 0.5);
}

td {
  padding: 0.75rem 1rem;
  font-size: 0.93rem;
  color: #0B161E;
  border-bottom: 1px solid rgba(200, 211, 213, 0.5);
  border-left: 3px solid transparent;
  background: #ffffff;
  transition: border-left-color 0.15s;
}

tr:last-child td { border-bottom: none; }

tbody tr:hover td {
  border-left-color: #0B161E;
  background: rgba(200, 211, 213, 0.2);
}

/* ── Topic list ──────────────────────────── */
.topic-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.5rem;
}

.topic-list li {
  background: #ffffff;
  border: 1px solid #c8d3d5;
  border-radius: 6px;
  padding: 0.65rem 1rem 0.65rem 2rem;
  font-size: 0.94rem;
  color: #0B161E;
  position: relative;
}

.topic-list li::before {
  content: '▸';
  position: absolute;
  left: 0.75rem;
  color: rgba(11, 22, 30, 0.4);
  font-size: 0.82rem;
}

/* ── Assessment list ─────────────────────── */
.assessment-list {
  background: #ffffff;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid #c8d3d5;
  margin-bottom: 0.75rem;
}

.a-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid rgba(200, 211, 213, 0.4);
  gap: 1rem;
}

.a-row:last-child { border-bottom: none; }

.a-row--project {
  background: rgba(200, 211, 213, 0.15);
}

.a-left {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.a-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #0B161E;
}

.a-detail {
  font-size: 0.83rem;
  color: rgba(11, 22, 30, 0.5);
}

.a-weight {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0B161E;
  white-space: nowrap;
}

.small {
  font-size: 0.85rem;
  color: rgba(11, 22, 30, 0.5);
  font-style: italic;
}

/* ── Contact ─────────────────────────────── */
#contact a {
  color: #0B161E;
  font-weight: 600;
  text-decoration: none;
}
#contact a:hover { text-decoration: underline; }

/* ── Bottom bar ──────────────────────────── */
.bottom-bar {
  background: #0B161E;
  color: rgba(200, 211, 213, 0.75);
  padding: 0.75rem 2rem;
  border-top: 1px solid rgba(200, 211, 213, 0.2);
}

.bottom-bar-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
  font-size: 0.85rem;
}

.bottom-bar strong {
  color: #c8d3d5;
  font-weight: 600;
}

/* ── Footer ──────────────────────────────── */
footer {
  background: #0B161E;
  color: rgba(200, 211, 213, 0.35);
  text-align: center;
  padding: 1rem;
  font-size: 0.82rem;
  border-top: 1px solid rgba(200, 211, 213, 0.1);
}

@media (max-width: 640px) {
  header h1 { font-size: 1.7rem; }
  .header-inner { flex-direction: column; }
  nav { flex-wrap: wrap; justify-content: flex-start; }
  nav a { padding: 0.65rem 1rem; font-size: 0.85rem; }
}