/* ═══════════════════════════════════════
   JC AI Platform — IBM Carbon Dark Theme
   Custom overrides for R&D Lab dashboard
   ═══════════════════════════════════════ */

:root {
  /* IBM Carbon Gray 100 (dark) theme tokens */
  --cds-background: #161616;
  --cds-background-hover: #353535;
  --cds-background-active: #525252;
  --cds-layer-01: #262626;
  --cds-layer-02: #393939;
  --cds-layer-hover: #353535;
  --cds-border-subtle: #393939;
  --cds-border-strong: #6f6f6f;
  --cds-text-primary: #f4f4f4;
  --cds-text-secondary: #c6c6c6;
  --cds-text-placeholder: #6f6f6f;
  --cds-text-on-color: #ffffff;
  --cds-text-helper: #a8a8a8;
  --cds-link-primary: #78a9ff;
  --cds-link-visited: #be95ff;
  --cds-icon-primary: #f4f4f4;
  --cds-icon-secondary: #c6c6c6;
  --cds-support-error: #ff8389;
  --cds-support-success: #42be65;
  --cds-support-warning: #f1c21b;
  --cds-support-info: #4589ff;
  --cds-interactive: #0f62fe;
  --cds-interactive-hover: #0353e9;
  --cds-interactive-active: #002d9c;
  --cds-focus: #ffffff;
  --cds-field-01: #262626;
  --cds-field-02: #393939;
  --cds-skeleton-bg: #353535;
  --cds-skeleton-el: #525252;
  --cds-overlay: rgba(0, 0, 0, 0.65);

  /* Spacing scale (Carbon 4px grid) */
  --space-01: 2px;
  --space-02: 4px;
  --space-03: 8px;
  --space-04: 12px;
  --space-05: 16px;
  --space-06: 24px;
  --space-07: 32px;
  --space-08: 40px;
  --space-09: 48px;

  /* Typography */
  --font-family: 'IBM Plex Sans', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', monospace;
}

/* ── Global reset ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  font-size: 14px;
  line-height: 1.5;
  color: var(--cds-text-primary);
  background-color: var(--cds-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Scrollbar (Carbon-style) ── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--cds-background);
}
::-webkit-scrollbar-thumb {
  background: var(--cds-border-strong);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--cds-text-placeholder);
}

/* ── Typography scale ── */
.heading-01 { font-size: 14px; font-weight: 600; line-height: 1.29; letter-spacing: 0.16px; }
.heading-02 { font-size: 16px; font-weight: 600; line-height: 1.375; }
.heading-03 { font-size: 20px; font-weight: 400; line-height: 1.4; }
.heading-04 { font-size: 28px; font-weight: 400; line-height: 1.29; }
.heading-05 { font-size: 32px; font-weight: 300; line-height: 1.25; }
.body-01 { font-size: 14px; font-weight: 400; line-height: 1.43; letter-spacing: 0.16px; }
.body-02 { font-size: 16px; font-weight: 400; line-height: 1.5; }
.label-01 { font-size: 12px; font-weight: 400; line-height: 1.34; letter-spacing: 0.32px; }
.helper-text { font-size: 12px; font-weight: 400; line-height: 1.34; color: var(--cds-text-helper); }
.code-01 { font-family: var(--font-mono); font-size: 12px; line-height: 1.34; letter-spacing: 0.32px; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-03);
  padding: 11px 64px 11px 16px;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.29;
  letter-spacing: 0.16px;
  border: none;
  cursor: pointer;
  transition: background-color 110ms cubic-bezier(0.2, 0, 0.38, 0.9);
  min-height: 48px;
  position: relative;
}

.btn-primary {
  background-color: var(--cds-interactive);
  color: var(--cds-text-on-color);
}
.btn-primary:hover { background-color: var(--cds-interactive-hover); }
.btn-primary:active { background-color: var(--cds-interactive-active); }
.btn-primary:disabled {
  background-color: var(--cds-layer-02);
  color: var(--cds-text-placeholder);
  cursor: not-allowed;
}

.btn-secondary {
  background-color: var(--cds-layer-02);
  color: var(--cds-text-primary);
}
.btn-secondary:hover { background-color: var(--cds-background-hover); }
.btn-secondary:active { background-color: var(--cds-background-active); }

.btn-ghost {
  background-color: transparent;
  color: var(--cds-link-primary);
  padding: 11px 16px;
}
.btn-ghost:hover { background-color: var(--cds-background-hover); }

.btn-danger {
  background-color: #da1e28;
  color: var(--cds-text-on-color);
}
.btn-danger:hover { background-color: #b81922; }

.btn-sm {
  min-height: 32px;
  padding: 7px 64px 7px 16px;
  font-size: 14px;
}

.btn-md {
  min-height: 40px;
  padding: 9px 64px 9px 16px;
}

/* ── Cards (tile) ── */
.tile {
  background-color: var(--cds-layer-01);
  padding: var(--space-05);
  min-height: 64px;
}

.tile-clickable {
  cursor: pointer;
  transition: background-color 110ms;
}
.tile-clickable:hover {
  background-color: var(--cds-layer-hover);
}

/* ── Form elements ── */
.form-group {
  margin-bottom: var(--space-06);
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.34;
  letter-spacing: 0.32px;
  color: var(--cds-text-secondary);
  margin-bottom: var(--space-03);
}

.form-input,
.form-select {
  width: 100%;
  height: 40px;
  padding: 0 16px;
  font-size: 14px;
  font-family: var(--font-family);
  color: var(--cds-text-primary);
  background-color: var(--cds-field-01);
  border: none;
  border-bottom: 1px solid var(--cds-border-strong);
  outline: none;
  transition: border-color 110ms, outline 110ms;
}

.form-input:focus,
.form-select:focus {
  outline: 2px solid var(--cds-interactive);
  outline-offset: -2px;
}

.form-input::placeholder {
  color: var(--cds-text-placeholder);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%23f4f4f4' d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 48px;
}

/* ── Tabs ── */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--cds-border-subtle);
  gap: 0;
}

.tab-btn {
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 400;
  color: var(--cds-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 110ms, border-color 110ms;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--cds-text-primary);
  background-color: var(--cds-background-hover);
}

.tab-btn.active {
  color: var(--cds-text-primary);
  font-weight: 600;
  border-bottom-color: var(--cds-interactive);
}

/* ── Tags ── */
.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.32px;
  border-radius: 12px;
}

.tag-blue { background-color: #0043ce; color: #d0e2ff; }
.tag-green { background-color: #0e6027; color: #a7f0ba; }
.tag-red { background-color: #a2191f; color: #ffd7d9; }
.tag-purple { background-color: #6929c4; color: #e8daff; }
.tag-gray { background-color: var(--cds-layer-02); color: var(--cds-text-secondary); }
.tag-teal { background-color: #005d5d; color: #9ef0f0; }
.tag-warm-gray { background-color: #474747; color: #c6c6c6; }

/* ── Loading / Skeleton ── */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--cds-skeleton-bg) 25%,
    var(--cds-skeleton-el) 37%,
    var(--cds-skeleton-bg) 63%
  );
  background-size: 400% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
}

@keyframes skeleton-loading {
  0% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cds-border-strong);
  border-top-color: var(--cds-interactive);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.spinner-lg {
  width: 48px;
  height: 48px;
  border-width: 3px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Notification ── */
.notification {
  display: flex;
  padding: var(--space-05);
  gap: var(--space-04);
  font-size: 14px;
  line-height: 1.29;
}

.notification-info { background-color: #002d9c; border-left: 3px solid #4589ff; }
.notification-success { background-color: #044317; border-left: 3px solid #42be65; }
.notification-warning { background-color: #4e3800; border-left: 3px solid #f1c21b; }
.notification-error { background-color: #750e13; border-left: 3px solid #ff8389; }

/* ── Grid system (simple responsive) ── */
.grid {
  display: grid;
  gap: var(--space-05);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1056px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 672px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ── Data table (minimal) ── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table thead th {
  text-align: left;
  font-weight: 600;
  font-size: 14px;
  padding: 12px 16px;
  color: var(--cds-text-primary);
  background-color: var(--cds-layer-02);
  border-bottom: 1px solid var(--cds-border-subtle);
}

.data-table tbody td {
  padding: 12px 16px;
  color: var(--cds-text-secondary);
  border-bottom: 1px solid var(--cds-border-subtle);
}

.data-table tbody tr:hover {
  background-color: var(--cds-layer-hover);
}

/* ── Utility ── */
.text-primary { color: var(--cds-text-primary); }
.text-secondary { color: var(--cds-text-secondary); }
.text-helper { color: var(--cds-text-helper); }
.text-error { color: var(--cds-support-error); }
.text-success { color: var(--cds-support-success); }
.text-warning { color: var(--cds-support-warning); }

.bg-layer-01 { background-color: var(--cds-layer-01); }
.bg-layer-02 { background-color: var(--cds-layer-02); }

.mt-03 { margin-top: var(--space-03); }
.mt-05 { margin-top: var(--space-05); }
.mt-06 { margin-top: var(--space-06); }
.mb-03 { margin-bottom: var(--space-03); }
.mb-05 { margin-bottom: var(--space-05); }
.mb-06 { margin-bottom: var(--space-06); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-03 { gap: var(--space-03); }
.gap-05 { gap: var(--space-05); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}