/* ============================================================
   COURSES PAGE
   ============================================================ */

/* Force navbar always visible (no transparent phase) */
.navbar.is-scrolled {
  background: rgba(11, 30, 45, 0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border-lo);
}

/* ============================================================
   PAGE HEADER (dark teal hero)
   ============================================================ */
.page-header {
  background: var(--bg-teal);
  padding: 120px 0 64px;
}

.page-header-title {
  font-family: var(--serif);
  font-size: clamp(34px, 4.9vw, 56px);
  font-weight: 700;
  color: var(--text-hi);
  line-height: 1.0;
  margin: 10px 0 20px;
}

.page-header-desc {
  font-size: 15.5px;
  color: var(--text-mid);
  max-width: 560px;
  line-height: 1.72;
}


/* ============================================================
   MAIN CONTENT (warm background)
   ============================================================ */
.courses-main {
  background: var(--bg-warm);
  padding: 72px 0 96px;
}

/* Course group (Undergraduate / Graduate) */
.course-group {
  margin-bottom: 72px;
}
.course-group:last-child { margin-bottom: 0; }

.course-group-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 10px;
}

.course-group-title {
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 20px;
}

.course-group-rule {
  height: 1px;
  background: rgba(0, 0, 0, 0.12);
  margin-bottom: 28px;
}


/* ============================================================
   COURSE ITEM CARD
   ============================================================ */
.course-item {
  background: #ffffff;
  border-left: 4px solid var(--teal);
  border-radius: 0 3px 3px 0;
  margin-bottom: 20px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.course-item-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 24px 18px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
}

.course-item-num {
  display: block;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 6px;
}

.course-item-name {
  font-family: var(--serif);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.25;
}

/* Badge */
.course-item-badge {
  flex-shrink: 0;
  display: inline-block;
  padding: 4px 11px;
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 1px solid rgba(0, 0, 0, 0.18);
  border-radius: 2px;
  color: var(--text-dark-mid);
  white-space: nowrap;
  margin-top: 3px;
}

.course-item-badge--grad {
  border-color: var(--teal);
  color: var(--teal);
}

.course-item-badge--mixed {
  border-color: #c9a84c;
  color: #a07a28;
}

/* Description */
.course-item-body {
  padding: 20px 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-item-body p {
  font-size: 14.5px;
  color: var(--text-dark-mid);
  line-height: 1.75;
}


/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 600px) {
  .course-item-head {
    flex-direction: column;
    gap: 10px;
  }
  .course-item-badge { align-self: flex-start; }
}