/* 课程介绍、筛选、课程卡片及升学计算器。 */

@media (max-width: 600px) {
  .course-admin-actions { width: 100%; flex-wrap: wrap; justify-content: flex-start; }

  .course-admin-actions .batch-actions { order: 3; width: 100%; box-sizing: border-box; justify-content: space-between; }

  .course-admin-actions .btn-batch { flex: 1; justify-content: center; min-height: 34px; }

  .course-admin-actions #batch-count { white-space: nowrap; }
}

/* ===== 升学计算器 ===== */
.calc-card-inline { max-width:700px; margin:0 auto; background:white; border-radius:20px; box-shadow:0 8px 40px rgba(79,70,229,0.1); overflow:hidden; }

.calc-card-inline .calc-header { background:linear-gradient(135deg,#312e81,#4f46e5); color:white; padding:1.5rem 2rem; text-align:center; }

.calc-card-inline .calc-header h1 { font-size:1.4rem; margin:0 0 0.4rem; }

.calc-card-inline .calc-header p { opacity:0.85; font-size:0.85rem; margin:0; }

.calc-card-inline .calc-body { padding:1.5rem 2rem; }

.calc-card-inline .calc-steps { display:flex; justify-content:center; align-items:center; gap:0; margin-bottom:1.5rem; }

.calc-card-inline .calc-step { display:flex; align-items:center; gap:8px; font-size:0.85rem; color:var(--gray-400); }

.calc-card-inline .calc-step .num { width:28px; height:28px; border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:0.8rem; font-weight:700; background:var(--gray-200); color:white; transition:all 0.3s; }

.calc-card-inline .calc-step.active .num { background:var(--primary); box-shadow:0 2px 8px rgba(79,70,229,0.3); }

.calc-card-inline .calc-step.done .num { background:#22c55e; }

.calc-card-inline .calc-step.active { color:var(--primary); font-weight:600; }

.calc-card-inline .calc-step.done { color:#22c55e; }

.calc-card-inline .step-arrow { color:var(--gray-300); margin:0 12px; }

.calc-card-inline .calc-form { display:block; }

.calc-card-inline .calc-form.hidden { display:none; }

.calc-card-inline .form-group { margin-bottom:1rem; }

.calc-card-inline .form-group label { display:block; font-size:0.85rem; font-weight:600; color:var(--gray-700); margin-bottom:5px; }

.calc-card-inline .form-group label .hint { font-weight:400; color:var(--gray-400); font-size:0.8rem; }

.calc-card-inline .form-group input,
.calc-card-inline .form-group select { width:100%; padding:0.6rem 0.9rem; border:2px solid var(--gray-200); border-radius:10px; font-size:0.95rem; outline:none; transition:all 0.2s; box-sizing:border-box; }

.calc-card-inline .form-group input:focus,
.calc-card-inline .form-group select:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(79,70,229,0.1); }

.calc-card-inline .score-group { position:relative; }

.calc-card-inline .score-display { font-size:2.2rem; font-weight:800; text-align:center; color:var(--primary); margin:0.4rem 0; }

.calc-card-inline .score-slider { width:100%; -webkit-appearance:none; height:6px; border-radius:3px; background:linear-gradient(to right,#dc2626,#eab308,#22c55e); outline:none; }

.calc-card-inline .score-slider::-webkit-slider-thumb { -webkit-appearance:none; width:22px; height:22px; border-radius:50%; background:white; border:3px solid var(--primary); cursor:pointer; box-shadow:0 2px 8px rgba(79,70,229,0.3); }

.calc-card-inline .score-labels { display:flex; justify-content:space-between; font-size:0.75rem; color:var(--gray-400); margin-top:4px; }

.calc-card-inline .calc-btn { width:100%; padding:0.75rem; border:none; border-radius:12px; font-size:1rem; font-weight:700; cursor:pointer; transition:all 0.2s; }

.calc-card-inline .calc-btn.primary { background:linear-gradient(135deg,#312e81,#4f46e5); color:white; box-shadow:0 4px 16px rgba(79,70,229,0.3); }

.calc-card-inline .calc-btn.primary:hover { transform:translateY(-1px); box-shadow:0 6px 20px rgba(79,70,229,0.4); }

.calc-card-inline .calc-btn.primary:disabled { opacity:0.5; cursor:not-allowed; transform:none; }

.calc-card-inline .calc-btn.outline { background:white; color:var(--primary); border:2px solid var(--primary); max-width:200px; }

.calc-card-inline .calc-btn.outline:hover { background:#f0f4ff; }

.calc-card-inline .calc-results { display:none; }

.calc-card-inline .calc-results.show { display:block; }

.calc-card-inline .result-score { text-align:center; padding:1.25rem; background:linear-gradient(135deg,#f0f4ff,#e0e7ff); border-radius:16px; margin-bottom:1.25rem; }

.calc-card-inline .result-score .big { font-size:2.5rem; font-weight:800; color:var(--primary); }

.calc-card-inline .result-section { margin-bottom:1.25rem; }

.calc-card-inline .result-section h3 { font-size:0.9rem; font-weight:700; margin:0 0 0.6rem; display:flex; align-items:center; gap:8px; }

.calc-card-inline .school-card { padding:0.85rem 1.1rem; border-radius:12px; border-left:4px solid; display:flex; justify-content:space-between; align-items:center; margin-bottom:6px; }

.calc-card-inline .school-card .name { font-weight:600; font-size:0.9rem; }

.calc-card-inline .school-card .line { font-size:0.78rem; color:var(--gray-500); }

.calc-card-inline .school-card .prob { width:52px; height:24px; border-radius:12px; font-size:0.72rem; font-weight:700; display:flex; align-items:center; justify-content:center; flex-shrink:0; }

.calc-card-inline .school-card.dash { border-color:#22c55e; background:#f0fdf4; }

.calc-card-inline .school-card.dash .prob { background:#22c55e; color:white; }

.calc-card-inline .school-card.steady { border-color:#4f46e5; background:#eef2ff; }

.calc-card-inline .school-card.steady .prob { background:#4f46e5; color:white; }

.calc-card-inline .school-card.safe { border-color:#eab308; background:#fefce8; }

.calc-card-inline .school-card.safe .prob { background:#eab308; color:white; }

.calc-card-inline .school-card.gap { border-color:#94a3b8; background:#f8fafc; }

.calc-card-inline .school-card.gap .prob { background:#94a3b8; color:white; }

.calc-card-inline .fade-up { opacity:0; transform:translateY(20px); animation:fadeUp 0.5s ease forwards; }

.calc-card-inline .fade-up:nth-child(2) { animation-delay:0.1s; }

.calc-card-inline .fade-up:nth-child(3) { animation-delay:0.2s; }

@keyframes fadeUp { to { opacity:1; transform:translateY(0); } }

@media (max-width:480px) {
  .calc-card-inline .calc-body { padding:1rem; }

  .calc-card-inline .calc-header { padding:1.25rem; }

  .calc-card-inline .calc-header h1 { font-size:1.2rem; }

  .calc-card-inline .calc-step span { display:none; }

  .calc-card-inline .score-display { font-size:1.8rem; }

  .calc-card-inline .result-score .big { font-size:2rem; }
}

/* ===== 课程介绍全新样式 ===== */
#tab-course-intro {
  animation: regFadeIn 0.3s ease;
  padding-top: 0.6rem;
}

.intro-header {
  font-size: 1.12rem; font-weight: 800; color: #0f172a;
  margin-bottom: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

/* ===== 筛选卡片容器 ===== */
.course-filter-card {
  --course-filter-accent: #4f46e5;
  position: relative;
  overflow: hidden;
  border-radius: 22px;
  padding: 1rem;
  margin-bottom: 1rem;
  background:
    radial-gradient(circle at 92% 8%, color-mix(in srgb, var(--course-filter-accent) 18%, transparent) 0 18%, transparent 34%),
    linear-gradient(135deg, #ffffff 0%, #f8fbff 58%, color-mix(in srgb, var(--course-filter-accent) 8%, #ffffff) 100%);
  border: 1px solid color-mix(in srgb, var(--course-filter-accent) 16%, #e2e8f0);
  box-shadow: 0 16px 42px rgba(15,23,42,0.07), inset 0 1px 0 rgba(255,255,255,0.9);
}

.course-filter-card::before {
  content: '';
  position: absolute;
  width: 160px;
  height: 160px;
  right: -78px;
  top: -86px;
  border-radius: 46px;
  transform: rotate(18deg);
  background: color-mix(in srgb, var(--course-filter-accent) 12%, transparent);
  pointer-events: none;
}

.course-filter-card-hd {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 0.9rem;
}

.course-filter-card-hd strong {
  display: block;
  font-size: 1rem;
  line-height: 1.2;
  font-weight: 900;
  color: #0f172a;
  letter-spacing: 0.01em;
}

.course-filter-kicker {
  display: block;
  margin-bottom: 2px;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--course-filter-accent) 78%, #64748b);
}

.course-filter-head-actions {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
}

.course-filter-current {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  flex-wrap: wrap;
  min-width: 0;
  max-width: min(54vw, 420px);
}

.course-filter-current span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  color: #64748b;
  font-size: 0.74rem;
  font-weight: 800;
  background: rgba(248,250,252,0.9);
  border: 1px solid rgba(226,232,240,0.86);
  white-space: nowrap;
}

.course-filter-count {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  background: linear-gradient(135deg, color-mix(in srgb, var(--course-filter-accent) 86%, #fff), var(--course-filter-accent));
  box-shadow: 0 8px 18px color-mix(in srgb, var(--course-filter-accent) 24%, transparent);
}

.course-filter-row {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  padding: 0.7rem 0;
  border-top: 1px dashed rgba(148,163,184,0.22);
}

.course-filter-row:first-of-type { border-top: 0; padding-top: 0; }

.course-filter-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  border-radius: 999px;
  background: #f1f5f9;
  color: #64748b;
  font-size: 0.74rem;
  font-weight: 800;
  white-space: nowrap;
}

.course-filter-options {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
}

.course-broad-tabs { margin-bottom: 0; }

.course-broad-tab,
.course-filter-chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 7px 14px;
  border: 1px solid #e2e8f0;
  border-radius: 999px;
  background: rgba(255,255,255,0.86);
  color: #475569;
  font-size: 0.82rem;
  font-weight: 800;
  font-family: inherit;
  line-height: 1;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
  box-shadow: 0 1px 2px rgba(15,23,42,0.03);
}

.course-broad-tab:hover,
.course-filter-chip:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--course-filter-accent) 28%, #cbd5e1);
  color: var(--course-filter-accent);
  background: #fff;
  box-shadow: 0 8px 18px rgba(15,23,42,0.07);
}

.course-broad-tab.active,
.course-filter-chip.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, color-mix(in srgb, var(--course-filter-accent) 82%, #fff), var(--course-filter-accent));
  box-shadow: 0 8px 18px color-mix(in srgb, var(--course-filter-accent) 22%, transparent);
}

.course-broad-tab.active { background: linear-gradient(135deg, color-mix(in srgb, var(--c, #4f46e5) 82%, #fff), var(--c, #4f46e5)); }

.course-filter-row-subject { position: relative; }

.course-filter-sep { display: none; }

.course-filter-bar { display: contents; }

@media (max-width: 640px) {
  .course-filter-card {
    border-radius: 18px;
    padding: 0.9rem;
    margin-left: -0.1rem;
    margin-right: -0.1rem;
  }

  .course-filter-card-hd { align-items: flex-start; margin-bottom: 0.75rem; }

  .course-filter-card-hd strong { font-size: 0.95rem; }

  .course-filter-head-actions { flex-direction: column; align-items: flex-end; gap: 5px; }

  .course-filter-current { max-width: 54vw; flex-wrap: nowrap; overflow-x: auto; justify-content: flex-end; }

  .course-filter-current::-webkit-scrollbar { display: none; }

  .course-filter-current span { min-height: 24px; padding: 0 8px; font-size: 0.68rem; }

  .course-filter-count { min-height: 26px; padding: 0 9px; font-size: 0.7rem; }

  .course-filter-row {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 8px;
    padding: 0.62rem 0;
  }

  .course-filter-label { height: 26px; font-size: 0.7rem; }

  .course-filter-options {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
  }

  .course-filter-options::-webkit-scrollbar { display: none; }

  .course-filter-row-subject .course-filter-options { padding-right: 84px; }

  .course-filter-row-subject::after {
    content: '左右滑动 →';
    position: absolute;
    right: 0;
    top: 0.62rem;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    height: 26px;
    padding: 0 8px 0 18px;
    border-radius: 999px;
    color: color-mix(in srgb, var(--course-filter-accent) 78%, #64748b);
    font-size: 0.68rem;
    font-weight: 900;
    white-space: nowrap;
    pointer-events: none;
    background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,0.94) 24%, #fff 100%);
  }

  .course-broad-tab,
  .course-filter-chip {
    flex: 0 0 auto;
    min-height: 30px;
    padding: 7px 12px;
    font-size: 0.76rem;
  }
}

/* ===== 课程列表容器 ===== */
.course-list-wrap { min-height: 80px; }

/* ===== 空态消息 ===== */
.course-empty-msg {
  color: var(--gray-400); text-align: center;
  padding: 1.5rem; font-size: 0.88rem;
}

.course-section {
  margin-bottom: 1rem;
  padding: 0.85rem;
  border: 1px solid rgba(226,232,240,0.7);
  border-radius: 20px;
  background: #fff;
  background:
    radial-gradient(circle at top right, color-mix(in srgb, var(--accent, #4f46e5) 14%, transparent) 0, transparent 36%),
    linear-gradient(145deg, color-mix(in srgb, var(--accent, #4f46e5) 10%, white) 0%, #fff 54%, color-mix(in srgb, var(--accent, #4f46e5) 4%, white) 100%);
  box-shadow: 0 10px 30px rgba(15,23,42,0.06);
}

.course-section-header {
  display: flex; align-items: center; gap: 8px;
  font-size: 1rem; font-weight: 800; color: #0f172a;
  margin-bottom: 0.75rem;
  padding: 0.15rem 0;
  border-left: 0;
}

.course-section-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 999px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.course-item {
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent, #4f46e5) 5%, white) 0%, color-mix(in srgb, var(--accent, #4f46e5) 2%, white) 100%);
  border-radius: 18px;
  transition: transform .35s cubic-bezier(0.34,1.56,0.64,1), box-shadow .35s cubic-bezier(0.34,1.56,0.64,1), border-color .35s cubic-bezier(0.34,1.56,0.64,1);
  display: flex; overflow: hidden;
  box-shadow: 0 12px 32px rgba(15,23,42,0.055);
  border: 1px solid rgba(226,232,240,0.9);
  position: relative;
}

.course-item::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent, #4f46e5) 16%, white), var(--accent, #4f46e5), color-mix(in srgb, var(--accent, #4f46e5) 22%, white));
  opacity: 1;
  pointer-events: none;
}

.course-item:hover {
  box-shadow: 0 18px 44px -12px rgba(15,23,42,0.18);
  transform: translateY(-5px);
  border-color: #dde7f0;
}

.course-item-accent {
  width: 4px; flex-shrink: 0;
  background: var(--accent, #4f46e5);
  border-radius: 18px 0 0 18px;
}

.course-item-body {
  flex: 1; padding: 1.1rem 1.05rem 1rem;
  display: flex; flex-direction: column; gap: 9px;
  align-items: stretch; text-align: left;
}

.course-item-body .course-item-top,
.course-item-body .course-item-meta,
.course-item-body .course-desc { flex-shrink: 0; }

.course-item-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }

.course-subject-tag {
  display: inline-block;
  padding: 5px 12px; border-radius: 999px;
  background: #eef2ff;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent, #4f46e5) 16%, white), color-mix(in srgb, var(--accent, #4f46e5) 8%, white));
  color: var(--accent, #4f46e5);
  color: color-mix(in srgb, var(--accent, #4f46e5) 92%, black); font-size: 0.85rem; font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 6px rgba(15,23,42,0.05);
}

.course-type-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px 4px 5px; border-radius: 999px;
  background: #fff;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent, #4f46e5) 8%, white), #fff);
  color: #475569;
  color: color-mix(in srgb, var(--accent, #4f46e5) 72%, #334155);
  font-size: 0.76rem; font-weight: 700;
  border: 1px solid #e2e8f0;
  border: 1px solid color-mix(in srgb, var(--accent, #4f46e5) 12%, #e2e8f0);
  line-height: 1.2;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.82), 0 2px 6px rgba(15,23,42,0.04);
}

.course-type-tag img {
  width: 28px;
  height: 28px;
  display: inline-flex;
  flex-shrink: 0;
  object-fit: contain;
  padding: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.course-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.course-section-icon {
  width: 32px;
  height: 32px;
  display: block;
  flex-shrink: 0;
  object-fit: contain;
  padding: 2px;
  border-radius: 10px;
  background: rgba(255,255,255,0.72);
  box-shadow: 0 1px 4px rgba(15,23,42,0.08);
}

.course-section-icon-hs {
  width: 36px;
  height: 36px;
  padding: 0;
}

.course-item-meta {
  display: flex; align-items: center; justify-content: flex-start; gap: 12px; flex-wrap: wrap;
  background: #f8fafc;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent, #4f46e5) 5%, white), #fff);
  padding: 7px 11px; border-radius: 12px;
  border: 1px solid rgba(226,232,240,0.72);
}

.course-grade {
  font-size: 0.78rem; color: #475569;
  font-weight: 600;
}

.course-grade::before { content: '年级 '; }

.course-duration {
  font-size: 0.8rem; color: #7c3aed; font-weight: 600;
  background: linear-gradient(135deg, #f5f3ff, #ede9fe);
  padding: 3px 10px; border-radius: 8px;
  display: inline-flex; align-items: center; gap: 3px;
}

.course-desc {
  font-size: 0.82rem; color: #5b6777;
  line-height: 1.5;
  padding: 6px 10px;
  background: linear-gradient(180deg, #fafbfc 0%, #f8fafc 100%);
  border-radius: 10px;
  border: 1px solid #f1f5f9;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-detail-link {
  margin-top: auto;
  padding: 8px 13px; border-radius: 10px;
  background: #eef2ff;
  background: color-mix(in srgb, var(--accent, #4f46e5) 10%, white);
  font-size: 0.83rem; font-weight: 700; color: var(--accent, #4f46e5);
  text-decoration: none; transition: all .25s;
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  border: 1px solid #e0e7ff;
  border: 1px solid color-mix(in srgb, var(--accent, #4f46e5) 18%, white);
}

.course-detail-link:hover {
  background: var(--accent, #4f46e5);
  color: #fff;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent, #4f46e5) 28%, transparent);
  transform: translateY(-1px);
}

.course-section-header { font-size: 1.05rem; }

/* 移动端适配 */
@media (max-width: 600px) {
  .course-section { padding: 0.75rem; border-radius: 16px; }

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

  .course-item-body { padding: 0.95rem 1rem; align-items: flex-start; text-align: left; }

  .course-item-top { justify-content: flex-start; }

  .course-item-meta { justify-content: flex-start; }

  .course-type-tag img { width: 24px; height: 24px; }
}

/* 桌面端课程卡片加宽减高 */
@media (min-width: 1024px) {
  .course-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.2rem; }

  .course-item-body { padding: 0.7rem 1.5rem 0.7rem; }

  .course-item-top { justify-content: flex-start; gap: 12px; }
}

.course-card { box-shadow: 0 10px 28px rgba(15, 23, 42, 0.07); }

.course-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 38px rgba(15, 23, 42, 0.1);
}

.course-card { transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease; }

/* ===== Course intro polish: card catalogue ===== */
#tab-course-intro .course-filter-card {
  border: 1px solid color-mix(in srgb, var(--course-filter-accent, #4f46e5) 18%, #e2e8f0);
  border-radius: 24px;
  background:
    radial-gradient(circle at 92% 8%, color-mix(in srgb, var(--course-filter-accent, #4f46e5) 16%, transparent), transparent 32%),
    linear-gradient(135deg, rgba(255,255,255,0.98), rgba(248,250,252,0.94));
  box-shadow: 0 18px 44px rgba(15, 23, 42, 0.08);
  overflow: hidden;
}

#tab-course-intro .course-filter-card-hd {
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(226,232,240,0.8);
}

#tab-course-intro .course-filter-kicker {
  color: var(--course-filter-accent, #4f46e5);
  letter-spacing: 0.08em;
}

#tab-course-intro .course-filter-current span,
#tab-course-intro .course-filter-count { box-shadow: 0 8px 18px rgba(15, 23, 42, 0.06); }

#tab-course-intro .course-broad-tab,
#tab-course-intro .course-filter-chip { box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), 0 6px 16px rgba(15,23,42,0.05); }

#tab-course-intro .course-broad-tab:hover,
#tab-course-intro .course-filter-chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(15,23,42,0.08);
}

#tab-course-intro .course-list-wrap { margin-top: 1.1rem; }

#tab-course-intro .course-section {
  border-radius: 24px;
  border: 1px solid rgba(226,232,240,0.95);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.98), rgba(248,250,252,0.92));
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.07);
  overflow: hidden;
}

#tab-course-intro .course-section-header {
  position: relative;
  padding: 0.15rem 0 0.8rem;
  color: #0f172a;
}

#tab-course-intro .course-section-header::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 72px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, #4f46e5, #06b6d4);
}

#tab-course-intro .course-grid { gap: 1rem; }

#tab-course-intro .course-item {
  position: relative;
  isolation: isolate;
  border-radius: 22px;
  border: 1px solid color-mix(in srgb, var(--accent, #4f46e5) 14%, #e2e8f0);
  background:
    radial-gradient(circle at 92% 12%, color-mix(in srgb, var(--accent, #4f46e5) 13%, transparent), transparent 36%),
    linear-gradient(145deg, #ffffff 0%, #fbfdff 52%, color-mix(in srgb, var(--accent, #4f46e5) 4%, #ffffff) 100%);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

#tab-course-intro .course-item::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.32), transparent 42%);
  pointer-events: none;
  z-index: 0;
}

#tab-course-intro .course-item:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--accent, #4f46e5) 30%, #cbd5e1);
  box-shadow: 0 24px 54px rgba(15, 23, 42, 0.13);
}

#tab-course-intro .course-item-accent {
  width: 5px;
  background: linear-gradient(180deg, var(--accent, #4f46e5), color-mix(in srgb, var(--accent, #4f46e5) 50%, #06b6d4));
}

#tab-course-intro .course-item-body {
  position: relative;
  z-index: 1;
  gap: 0.75rem;
}

#tab-course-intro .course-subject-tag {
  font-size: 1.02rem;
  color: #0f172a;
  background: transparent;
  border: none;
  box-shadow: none;
  padding-left: 0;
}

#tab-course-intro .course-type-tag {
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(10px);
}

#tab-course-intro .course-item-meta {
  border-radius: 16px;
  background: rgba(248,250,252,0.78);
  backdrop-filter: blur(10px);
}

#tab-course-intro .course-duration {
  color: color-mix(in srgb, var(--accent, #4f46e5) 72%, #334155);
  background: color-mix(in srgb, var(--accent, #4f46e5) 10%, white);
}

#tab-course-intro .course-desc {
  min-height: 3.35em;
  border-radius: 16px;
  background: rgba(255,255,255,0.72);
  border-color: rgba(226,232,240,0.82);
}

#tab-course-intro .course-detail-link {
  width: 100%;
  min-height: 40px;
  border-radius: 14px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent, #4f46e5) 12%, white), #fff);
}

#tab-course-intro .course-detail-link:hover { letter-spacing: 0.02em; }

@media (max-width: 600px) {
  #tab-course-intro .course-filter-card,
  #tab-course-intro .course-section { border-radius: 18px; }

  #tab-course-intro .course-item { border-radius: 18px; }

  #tab-course-intro .course-detail-link { width: 100%; }
}

/* ===== Compact correction: restore desktop width and reduce empty spacing ===== */
@media (min-width: 769px) {
  #tab-course-intro .course-filter-card,
  #tab-course-intro .course-section {
    border-radius: 16px;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.055);
  }

  #tab-course-intro .course-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.8rem;
  }

  #tab-course-intro .course-item {
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.055);
  }

  #tab-course-intro .course-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 26px rgba(15,23,42,0.08);
  }

  #tab-course-intro .course-desc { min-height: auto; }

  #tab-course-intro .course-detail-link {
    width: auto;
    min-height: 34px;
    padding: 7px 12px;
  }
}

/* ===== Spacing correction: restore compact vertical rhythm ===== */
@media (min-width: 769px) {
  .course-section-header { margin-top: 0 !important; }

  #tab-course-intro .course-filter-card { margin-bottom: 0.65rem; }

  #tab-course-intro .course-list-wrap { margin-top: 0.65rem; }

  #tab-course-intro .course-section {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    margin-bottom: 0.8rem;
  }

  #tab-course-intro .course-section-header {
    padding-bottom: 0.48rem;
    margin-bottom: 0.65rem;
  }

  #tab-course-intro .course-grid { gap: 0.65rem; }

  #tab-course-intro .course-item-body {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    gap: 0.52rem;
  }
}

.course-section-header { margin-top: 0 !important; }

#tab-course-intro .course-filter-card,
#tab-course-intro .course-section { margin-top: 0 !important; }

#tab-course-intro .course-item {
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}

#tab-course-intro .course-grid { gap: 0.5rem !important; }

#tab-course-intro .course-list-wrap { margin-top: 0.5rem !important; }

#tab-course-intro .course-filter-card { margin-bottom: 0.5rem !important; }

#tab-course-intro .course-section { margin-bottom: 0.65rem !important; }

@media (min-width: 769px) {
  #tab-course-intro .course-section { padding: 0.65rem !important; }

  #tab-course-intro .course-item-body {
    padding-top: 0.65rem !important;
    padding-bottom: 0.65rem !important;
    gap: 0.45rem !important;
  }
}

@media (max-width: 768px) {
  #tab-course-intro .course-filter-card,
  #tab-course-intro .course-section {
    padding: 0.6rem !important;
    border-radius: 14px !important;
    margin-bottom: 0.5rem !important;
  }

  #tab-course-intro .course-list-wrap { margin-top: 0.45rem !important; }

  #tab-course-intro .course-grid { gap: 0.45rem !important; }

  #tab-course-intro .course-item-body {
    padding: 0.62rem 0.72rem !important;
    gap: 0.4rem !important;
  }
}

/* ===== Course grid correction: desktop restores 4 cards per row ===== */
@media (min-width: 1024px) {
  #tab-course-intro .course-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    gap: 0.75rem !important;
  }
}

@media (min-width: 769px) and (max-width: 1023px) {
  #tab-course-intro .course-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
}

#tab-course-intro .course-item {
  width: 100%;
  min-width: 0;
}

/* ===== Course intro exact rhythm check/fix ===== */
#tab-course-intro.active {
  padding-top: 0.6rem !important;
  margin-top: 0 !important;
}

#tab-course-intro #course-intro-content {
  margin-top: 0 !important;
  padding-top: 0 !important;
}

#tab-course-intro .course-filter-card {
  padding: 1rem !important;
  margin-top: 0 !important;
  margin-bottom: 1rem !important;
}

#tab-course-intro .course-filter-card-hd { margin-bottom: 0.9rem !important; }

#tab-course-intro .course-filter-row {
  padding-top: 0.7rem !important;
  padding-bottom: 0.7rem !important;
}

#tab-course-intro .course-filter-row:first-of-type { padding-top: 0 !important; }

#tab-course-intro .course-list-wrap { margin-top: 0 !important; }

#tab-course-intro .course-section {
  padding: 1rem !important;
  margin-top: 0 !important;
  margin-bottom: 1rem !important;
}

#tab-course-intro .course-section-header {
  padding-bottom: 0 !important;
  margin-bottom: 0.85rem !important;
}

#tab-course-intro .course-section-header::after { display: none !important; }

#tab-course-intro .course-grid { gap: 1rem !important; }

#tab-course-intro .course-item-body {
  padding: 1rem 1.1rem !important;
  gap: 0.65rem !important;
}

@media (min-width: 1024px) {
  #tab-course-intro .course-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    gap: 1rem !important;
  }
}

@media (max-width: 768px) {
  #tab-course-intro.active { padding-top: 0.45rem !important; }

  #tab-course-intro .course-filter-card {
    padding: 0.75rem !important;
    margin-bottom: 0.75rem !important;
  }

  #tab-course-intro .course-filter-card-hd { margin-bottom: 0.65rem !important; }

  #tab-course-intro .course-filter-row {
    padding-top: 0.5rem !important;
    padding-bottom: 0.5rem !important;
    gap: 8px !important;
  }

  #tab-course-intro .course-section {
    padding: 0.75rem !important;
    margin-bottom: 0.75rem !important;
  }

  #tab-course-intro .course-section-header { margin-bottom: 0.6rem !important; }

  #tab-course-intro .course-grid { gap: 0.65rem !important; }

  #tab-course-intro .course-item-body {
    padding: 0.75rem 0.85rem !important;
    gap: 0.5rem !important;
  }
}

#tab-course-intro .course-filter-card,
#tab-course-intro .course-section { margin-top: 0 !important; }

#tab-course-intro .course-filter-card,
#tab-course-intro .course-section { margin-bottom: 0.55rem !important; }

#tab-course-intro .course-grid { gap: 0.45rem !important; }

#tab-course-intro.active { padding-top: 0.45rem !important; }

#tab-course-intro .course-filter-card { margin-bottom: 0.6rem !important; }

#tab-course-intro .course-section { margin-bottom: 0.6rem !important; }

@media (min-width: 769px) {
  #tab-course-intro .course-filter-card { padding: 0.85rem !important; }

  #tab-course-intro .course-section { padding: 0.8rem !important; }
}

@media (max-width: 768px) {
  #tab-course-intro .course-filter-card,
  #tab-course-intro .course-section {
    padding: 0.52rem !important;
    margin-bottom: 0.45rem !important;
  }

  #tab-course-intro.active { padding-top: 0.35rem !important; }

  #tab-course-intro .course-filter-row { padding-top: 0.42rem !important; padding-bottom: 0.42rem !important; }

  #tab-course-intro .course-item-body { padding: 0.58rem 0.68rem !important; }
}

/* ===== Mobile dashboard content edge alignment ===== */
@media (max-width: 640px) {
  #tab-course-intro .course-filter-card {
    margin-left: 0 !important;
    margin-right: 0 !important;
  }
}

#tab-course-intro.active { padding-top: 0.18rem !important; }

#tab-course-intro .course-filter-card { margin-top: 0 !important; }

@media (max-width: 768px) {
  #tab-course-intro.active { padding-top: 0.12rem !important; }
}

#tab-course-intro .course-filter-card,
#tab-course-intro .course-section { margin-top: 0 !important; }

#tab-course-intro .course-section { margin-bottom: 0.42rem !important; }

#tab-course-intro.active { padding-top: 0 !important; }

#tab-course-intro .course-filter-card {
  padding: 0.65rem 0.85rem !important;
  margin-bottom: 0.25rem !important;
}

#tab-course-intro .course-filter-card-hd {
  padding-bottom: 0.4rem;
  margin-bottom: 0.35rem !important;
}

#tab-course-intro .course-filter-row {
  padding-top: 0.35rem !important;
  padding-bottom: 0.35rem !important;
}

#tab-course-intro .course-filter-card-hd + .course-filter-row {
  padding-top: 0 !important;
  border-top: 0;
}

#tab-course-intro .course-filter-row:last-child { padding-bottom: 0 !important; }

#tab-course-intro .course-list-wrap { margin-top: 0 !important; }

#tab-course-intro .course-grid { gap: 0.25rem !important; }

/* Card spacing belongs to the body; reset the shared course-item padding. */
#tab-course-intro .course-item { padding: 0; min-height: 17.5rem; }

#tab-course-intro .course-item-body {
  padding: 1.25rem 0.85rem !important;
  gap: 0.85rem !important;
}

@media (max-width: 768px) {
  #tab-course-intro .course-section { margin-bottom: 0.32rem !important; }

  #tab-course-intro .course-filter-card { padding: 0.45rem 0.65rem !important; }

  #tab-course-intro .course-filter-row {
    padding-top: 0.3rem !important;
    padding-bottom: 0.3rem !important;
  }

  #tab-course-intro .course-filter-row-subject::after { top: 0.3rem; }

  #tab-course-intro .course-item { min-height: 15.5rem; }

  #tab-course-intro .course-item-body {
    padding: 1.05rem 0.65rem !important;
    gap: 0.75rem !important;
  }
}