/* Override body overflow for landing page (layout.css sets hidden) */
body { overflow: auto; }

.landing-main {
  max-width: 960px;
  margin: 0 auto;
  padding: calc(var(--topbar-h) + 40px) 24px 60px;
  min-height: 100vh;
}

.landing-hero {
  text-align: center;
  padding: 64px 0 52px;
}
.landing-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.8px;
}
.landing-hero p {
  font-size: 17px;
  color: var(--text-secondary);
  margin-top: 14px;
  line-height: 1.65;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.case-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--grey-border);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}
.case-card.case-available:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
[data-theme="dark"] .case-card {
  background: linear-gradient(135deg, #0F1520 0%, #111827 100%);
  border: 1px solid rgba(255,255,255,0.06);
}
[data-theme="dark"] .case-card.case-available:hover {
  border-color: rgba(59, 130, 246, 0.25);
  box-shadow: var(--shadow-md), var(--glow-blue);
}
.case-card.case-locked {
  opacity: 0.5;
  cursor: default;
}

.case-card-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  border-radius: 4px;
  padding: 3px 9px;
  display: inline-block;
  align-self: flex-start;
}

/* Difficulty tag variants */
.case-card-badge.badge-beginner {
  color: var(--green);
  background: rgba(22, 163, 74, 0.08);
  border: 1px solid rgba(22, 163, 74, 0.2);
}
[data-theme="dark"] .case-card-badge.badge-beginner {
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.3);
}
.case-card-badge.badge-intermediate {
  color: var(--amber);
  background: rgba(217, 119, 6, 0.08);
  border: 1px solid rgba(217, 119, 6, 0.2);
}
[data-theme="dark"] .case-card-badge.badge-intermediate {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.3);
}
.case-card-badge.badge-advanced {
  color: var(--red);
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.2);
}
[data-theme="dark"] .case-card-badge.badge-advanced {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.3);
}
.case-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.15);
  margin: 4px 0;
  transition: background 0.3s ease, border-color 0.3s ease;
}
.case-card-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--blue);
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}
[data-theme="dark"] .case-card-icon {
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.2);
}
.case-card h2 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.2px;
  line-height: 1.3;
}
.case-card p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}

.case-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}
.case-card-meta span {
  font-size: 11.5px;
  color: var(--text-secondary);
  background: var(--grey-light);
  padding: 3px 10px;
  border-radius: 99px;
  font-weight: 500;
}

.case-card-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  font-variant-numeric: tabular-nums;
}

.progress-bar-mini {
  flex: 1;
  height: 5px;
  background: var(--grey-light);
  border-radius: 99px;
  overflow: hidden;
}
.progress-bar-mini-fill {
  height: 100%;
  background: linear-gradient(90deg, #3B82F6, #34D399);
  border-radius: 99px;
  transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.case-card-action {
  margin-top: auto;
  padding-top: 8px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--blue);
}
.case-card-action.locked {
  color: var(--text-muted);
}

/* Module filter bar */
.module-filters {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.filter-btn {
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 99px;
  border: 1px solid var(--grey-border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}
.filter-btn:hover {
  border-color: var(--text-secondary);
}
.filter-btn.active {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.filter-btn.filter-beginner.active {
  background: var(--green);
  border-color: var(--green);
}
.filter-btn.filter-intermediate.active {
  background: var(--amber);
  border-color: var(--amber);
}
.filter-btn.filter-advanced.active {
  background: var(--red);
  border-color: var(--red);
}
[data-theme="dark"] .filter-btn {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
}
[data-theme="dark"] .filter-btn:hover {
  border-color: rgba(255,255,255,0.2);
}

/* Module detail modal */
.module-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: modalFadeIn 0.2s ease;
}
@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
[data-theme="dark"] .module-modal-overlay {
  background: rgba(0,0,0,0.7);
}
.module-modal {
  background: var(--bg-card, #fff);
  border-radius: 16px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.2);
  max-width: 520px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 36px 32px 28px;
  position: relative;
  animation: modalSlideUp 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
[data-theme="dark"] .module-modal {
  background: linear-gradient(135deg, #0F1520 0%, #111827 100%);
  border: 1px solid rgba(255,255,255,0.08);
}
.module-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: all 0.15s;
}
.module-modal-close:hover {
  background: var(--grey-light);
  color: var(--text);
}
.module-modal-badge {
  margin-bottom: 16px;
}
.module-modal-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.4px;
  margin-bottom: 8px;
}
.module-modal-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}
.module-modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.module-modal-meta span {
  font-size: 11.5px;
  color: var(--text-secondary);
  background: var(--grey-light);
  padding: 3px 10px;
  border-radius: 99px;
  font-weight: 500;
}
[data-theme="dark"] .module-modal-meta span {
  background: rgba(255,255,255,0.06);
}
.module-modal-section {
  margin-bottom: 20px;
}
.module-modal-section h3 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.modal-objective {
  font-size: 13.5px;
  color: var(--text);
  padding: 5px 0;
  line-height: 1.4;
}
.module-modal-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.modal-detail {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 6px 0;
  border-bottom: 1px solid var(--grey-border);
}
[data-theme="dark"] .modal-detail {
  border-color: rgba(255,255,255,0.06);
}
.modal-detail:last-child { border: none; }
.modal-detail-label {
  color: var(--text-secondary);
}
.modal-detail span:last-child {
  font-weight: 600;
  color: var(--text);
}
.module-modal-progress {
  margin: 16px 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-secondary);
}
.module-modal-cta {
  display: block;
  text-align: center;
  padding: 14px 24px;
  background: var(--blue, #2563EB);
  color: #fff;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-body);
  text-decoration: none;
  transition: all 0.2s ease;
  margin-top: 8px;
}
.module-modal-cta:hover {
  background: #1D4ED8;
  transform: translateY(-1px);
}

@media (max-width: 820px) {
  .module-modal {
    max-height: 90vh;
    padding: 28px 20px 24px;
  }
}