.edu-shell {
  min-height: 100vh;
  padding: 108px 0 72px;
  background:
    radial-gradient(circle at 12% 12%, rgba(20, 184, 166, 0.12), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(14, 165, 233, 0.12), transparent 30%),
    linear-gradient(180deg, #f7fcff 0%, #eef8f8 52%, #f8fafc 100%);
}

.edu-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 28px;
  align-items: stretch;
  margin-bottom: 28px;
}

.edu-hero-main,
.edu-hero-note {
  border: 1px solid rgba(15, 118, 110, 0.14);
  border-radius: 28px;
  overflow: hidden;
}

.edu-hero-main {
  position: relative;
  padding: 44px;
  color: #ecfeff;
  background: #083344;
  box-shadow: 0 24px 70px rgba(8, 51, 68, 0.18);
}

.edu-hero-main::after {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  right: -85px;
  top: -115px;
  border-radius: 44% 56% 62% 38%;
  border: 42px solid rgba(45, 212, 191, 0.12);
  transform: rotate(18deg);
}

.edu-kicker,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #5eead4;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.edu-hero h1 {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 16px 0 12px;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.edu-hero-main p {
  position: relative;
  z-index: 1;
  max-width: 640px;
  color: rgba(236, 254, 255, 0.74);
  font-size: 15px;
}

.edu-hero-note {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 30px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
}

.edu-hero-note strong {
  display: block;
  margin: 10px 0 8px;
  color: #0f172a;
  font-family: "Songti SC", "STSong", serif;
  font-size: 24px;
}

.edu-hero-note p { color: #64748b; font-size: 13px; }
.edu-admin-link { align-self: flex-start; margin-top: 24px; }
.edu-admin-link[hidden] { display: none; }

.learning-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.learning-stat {
  padding: 22px;
  border: 1px solid rgba(15, 118, 110, 0.12);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 10px 36px rgba(15, 118, 110, 0.06);
}

.learning-stat b {
  display: block;
  color: #0f766e;
  font-size: 30px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.learning-stat span { display: block; margin-top: 9px; color: #64748b; font-size: 12px; }

.learning-panel,
.catalog-panel {
  border: 1px solid rgba(15, 118, 110, 0.12);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 18px 54px rgba(15, 118, 110, 0.07);
}

.learning-panel { padding: 28px; margin-bottom: 28px; }
.catalog-panel { padding: 28px; }

.panel-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.panel-heading h2 {
  margin-top: 5px;
  color: #0f172a;
  font-family: "Songti SC", "STSong", serif;
  font-size: 28px;
}

.panel-heading p { max-width: 480px; color: #64748b; font-size: 13px; text-align: right; }

.learning-track {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}

.track-item {
  padding: 18px;
  border-radius: 16px;
  color: #0f172a;
  background: #f0fdfa;
  border: 1px solid #ccfbf1;
}

.track-item strong { display: block; margin-bottom: 8px; font-size: 14px; }
.track-meta { display: flex; justify-content: space-between; color: #64748b; font-size: 11px; }

.catalog-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.course-filters { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-btn {
  padding: 8px 14px;
  border: 1px solid #dbeafe;
  border-radius: 999px;
  color: #475569;
  background: white;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.filter-btn.active { border-color: #0f766e; color: white; background: #0f766e; }
.catalog-count { color: #64748b; font-size: 12px; }

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.course-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 330px;
  overflow: hidden;
  border: 1px solid #e2e8f0;
  border-radius: 20px;
  background: white;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.course-card:hover { transform: translateY(-4px); border-color: #99f6e4; box-shadow: 0 20px 40px rgba(15, 118, 110, 0.11); }

.course-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  min-height: 104px;
  padding: 20px;
  background: linear-gradient(135deg, #ecfeff, #eff6ff);
}

.course-index { color: #0f766e; font-family: Georgia, serif; font-size: 34px; font-style: italic; }
.course-level { padding: 5px 9px; border-radius: 999px; background: rgba(255,255,255,.78); color: #0369a1; font-size: 11px; font-weight: 800; }
.course-card-body { display: flex; flex: 1; flex-direction: column; padding: 20px; }
.course-card h3 { color: #0f172a; font-size: 18px; line-height: 1.35; }
.course-card-desc { display: -webkit-box; overflow: hidden; margin: 9px 0 16px; color: #64748b; font-size: 13px; -webkit-line-clamp: 3; -webkit-box-orient: vertical; }
.course-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; color: #64748b; font-size: 11px; }
.course-meta span { padding: 4px 8px; border-radius: 7px; background: #f8fafc; }
.course-progress-line { height: 6px; margin: 16px 0 8px; overflow: hidden; border-radius: 999px; background: #e2e8f0; }
.course-progress-line i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #14b8a6, #0ea5e9); }
.course-action { width: 100%; margin-top: 12px; justify-content: center; border: 0; cursor: pointer; }
.course-action:disabled { cursor: not-allowed; opacity: .55; transform: none; }

.edu-empty { grid-column: 1 / -1; padding: 48px 20px; border: 1px dashed #cbd5e1; border-radius: 18px; color: #64748b; text-align: center; background: #f8fafc; }

.course-modal[hidden] { display: none; }
.course-modal { position: fixed; inset: 0; z-index: 3000; display: grid; place-items: center; padding: 18px; }
.course-modal-backdrop { position: absolute; inset: 0; background: rgba(2, 44, 54, .64); backdrop-filter: blur(8px); }
.course-modal-card { position: relative; width: min(620px, 100%); max-height: min(760px, 92vh); overflow-y: auto; padding: 30px; border-radius: 24px; background: #fff; box-shadow: 0 30px 90px rgba(2, 44, 54, .28); }
.course-modal-close { position: absolute; top: 18px; right: 18px; width: 36px; height: 36px; border: 0; border-radius: 50%; color: #475569; background: #f1f5f9; cursor: pointer; }
.course-modal-card h2 { padding-right: 45px; margin: 10px 0; font-family: "Songti SC", "STSong", serif; font-size: 30px; }
.course-modal-description { color: #64748b; white-space: pre-wrap; }
.course-modal-meta { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0; }
.course-modal-meta span { padding: 6px 10px; border-radius: 8px; color: #0f766e; background: #f0fdfa; font-size: 12px; }
.course-content-link { margin-bottom: 20px; }
.progress-control { padding: 18px; border-radius: 16px; background: #f8fafc; }
.progress-control label { display: flex; justify-content: space-between; margin-bottom: 12px; font-size: 13px; font-weight: 700; }
.progress-control input { width: 100%; accent-color: #0f766e; }
.modal-message { margin-top: 12px; color: #b45309; font-size: 12px; }
.modal-message[hidden] { display: none; }

@media (max-width: 900px) {
  .edu-hero { grid-template-columns: 1fr; }
  .learning-stats { grid-template-columns: repeat(2, 1fr); }
  .courses-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .edu-shell { padding-top: 88px; }
  .edu-hero-main { padding: 30px 24px; }
  .edu-hero-note, .learning-panel, .catalog-panel { padding: 22px; border-radius: 20px; }
  .panel-heading, .catalog-toolbar { align-items: flex-start; flex-direction: column; }
  .panel-heading p { text-align: left; }
  .courses-grid { grid-template-columns: 1fr; }
  .course-modal-card { padding: 24px 20px; }
}