:root {
  /* Brand Colors */
  --bd-primary: #2563eb;
  --bd-primary-hover: #1d4ed8;
  --bd-primary-light: #eff6ff;
  --bd-primary-text: #1e40af;

  /* Neutral */
  --bd-bg: #ffffff;
  --bd-bg-secondary: #f8fafc;
  --bd-bg-tertiary: #f1f5f9;
  --bd-border: #e2e8f0;
  --bd-border-strong: #cbd5e1;

  /* Text */
  --bd-text: #0f172a;
  --bd-text-secondary: #475569;
  --bd-text-tertiary: #94a3b8;

  /* Semantic */
  --bd-success: #16a34a;
  --bd-success-light: #f0fdf4;
  --bd-warning: #b45309;
  --bd-warning-light: #fffbeb;
  --bd-danger: #dc2626;
  --bd-danger-light: #fef2f2;

  /* Spacing */
  --bd-radius-sm: 6px;
  --bd-radius-md: 8px;
  --bd-radius-lg: 12px;
  --bd-radius-xl: 16px;
  --bd-radius-full: 9999px;

  /* Shadow */
  --bd-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --bd-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);

  /* Typography */
  --bd-font: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bd-font-mono: "JetBrains Mono", "Fira Code", "Courier New", monospace;
}

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

body {
  font-family: var(--bd-font);
  background: var(--bd-bg-secondary);
  color: var(--bd-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.bd-topbar {
  background: var(--bd-bg);
  border-bottom: 1px solid var(--bd-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.bd-topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bd-topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bd-topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bd-topbar-divider {
  width: 1px;
  height: 16px;
  background: var(--bd-border);
}

.bd-back {
  font-size: 13px;
  color: var(--bd-text-secondary);
  text-decoration: none;
}

.bd-back:hover {
  color: var(--bd-text);
}

.bd-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--bd-text);
  line-height: 1.3;
}

.bd-main {
  flex: 1;
  padding: 24px;
}

.bd-container {
  max-width: 1100px;
  margin: 0 auto;
}

.bd-body {
  font-size: 14px;
  font-weight: 400;
  color: var(--bd-text);
  line-height: 1.6;
}

.bd-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--bd-text);
}

.bd-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--bd-text-secondary);
  letter-spacing: 0.03em;
}

.bd-card {
  background: var(--bd-bg);
  border: 1px solid var(--bd-border);
  border-radius: var(--bd-radius-lg);
  overflow: hidden;
}

.bd-card-body {
  padding: 16px;
}

.bd-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--bd-radius-md);
  font-family: var(--bd-font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
  white-space: nowrap;
}

.bd-btn:active {
  transform: scale(0.97);
}

.bd-btn-primary {
  background: var(--bd-primary);
  color: var(--bd-bg);
  border-color: var(--bd-primary);
}

.bd-btn-primary:hover {
  background: var(--bd-primary-hover);
  border-color: var(--bd-primary-hover);
}

.bd-btn-secondary {
  background: var(--bd-bg);
  color: var(--bd-text);
  border-color: var(--bd-border-strong);
}

.bd-btn-secondary:hover {
  background: var(--bd-bg-tertiary);
}

.bd-badge {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 8px;
  border-radius: var(--bd-radius-full);
  font-size: 11px;
  font-weight: 500;
}

.bd-badge-blue {
  background: var(--bd-primary-light);
  color: var(--bd-primary-text);
}

.bd-badge-green {
  background: var(--bd-success-light);
  color: var(--bd-success);
}

.bd-badge-gray {
  background: var(--bd-bg-tertiary);
  color: var(--bd-text-secondary);
}

.bd-badge-orange {
  background: var(--bd-warning-light);
  color: var(--bd-warning);
}

.bd-input {
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--bd-border);
  border-radius: var(--bd-radius-md);
  font-family: var(--bd-font);
  font-size: 14px;
  color: var(--bd-text);
  background: var(--bd-bg);
  width: 100%;
  transition: border-color 0.15s;
}

.bd-input::placeholder {
  color: var(--bd-text-tertiary);
}

.bd-input:focus {
  outline: none;
  border-color: var(--bd-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.bd-controls {
  margin-bottom: 20px;
}

.bd-search-wrap {
  display: grid;
  gap: 8px;
}

.bd-filter-section {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.bd-filter-actions {
  margin-top: 16px;
}

.bd-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.bd-chip-row-scroll {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
}

.bd-chip {
  border: 1px solid var(--bd-border-strong);
  background: var(--bd-bg);
  color: var(--bd-text-secondary);
  border-radius: var(--bd-radius-full);
  padding: 6px 10px;
  font-family: var(--bd-font);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.bd-chip:hover {
  border-color: var(--bd-primary);
  color: var(--bd-primary);
  background: var(--bd-primary-light);
}

.bd-chip.is-active {
  border-color: var(--bd-primary);
  color: var(--bd-primary-text);
  background: var(--bd-primary-light);
}

.bd-chip:active {
  transform: scale(0.97);
}

.bd-results-meta {
  margin-bottom: 12px;
}

.bd-resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.bd-resource-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bd-resource-title a {
  color: var(--bd-text);
  text-decoration: none;
}

.bd-resource-title a:hover {
  color: var(--bd-primary);
}

.bd-resource-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.bd-curator-note {
  background: var(--bd-bg-secondary);
  border-left: 3px solid var(--bd-primary);
  padding: 10px 12px;
  border-radius: var(--bd-radius-sm);
  margin-top: 12px;
}

.bd-curator-note .bd-label {
  margin-bottom: 4px;
  display: block;
}

.bd-empty-state {
  margin-top: 16px;
}

.bd-toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(60px);
  background: var(--bd-text);
  color: var(--bd-bg);
  padding: 8px 16px;
  border-radius: var(--bd-radius-md);
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  z-index: 1000;
  white-space: nowrap;
  box-shadow: var(--bd-shadow-md);
}

.bd-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.bd-input:focus,
.bd-chip:focus-visible,
.bd-back:focus-visible,
.bd-link:focus-visible,
.bd-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

@media (min-width: 768px) {
  .bd-resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .bd-resource-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.bd-footer {
  text-align: center;
  padding: 16px;
  border-top: 1px solid var(--bd-border);
  background: var(--bd-bg);
}

.bd-hint {
  font-size: 12px;
  color: var(--bd-text-tertiary);
}

.bd-link {
  color: var(--bd-primary);
  text-decoration: none;
}

.bd-link:hover {
  text-decoration: underline;
}