/* ==========================================================================
   Prompt Studio — Tool-specific styles
   Split-pane prompt editor with variable highlighting
   ========================================================================== */

/* --- Page shell --- */

.ps-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-primary);
}

/* --- Header --- */

.ps-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(9, 9, 11, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  flex-shrink: 0;
  z-index: var(--z-sticky);
}

.ps-header__left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.ps-header__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
  text-decoration: none;
}

.ps-header__back:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.ps-header__back svg {
  width: 16px;
  height: 16px;
}

.ps-header__title {
  font-family: var(--font-accent);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
}

.ps-header__title span {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ps-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ps-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.ps-header__status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-code);
}

.ps-header__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse 2s ease-in-out infinite;
}

.ps-header__status-dot--saving {
  background: var(--accent-warm);
}

/* --- Workspace --- */

.ps-workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* --- Editor pane (left) --- */

.ps-editor {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  background: var(--bg-secondary);
}

.ps-editor__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-tertiary);
  flex-shrink: 0;
}

.ps-editor__toolbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ps-editor__toolbar-label {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.ps-editor__toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ps-editor__area {
  flex: 1;
  position: relative;
  overflow: hidden;
}

/* Line numbers gutter */
.ps-editor__gutter {
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 100%;
  background: var(--bg-inset);
  border-right: 1px solid var(--border-subtle);
  padding: var(--space-4) 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 2;
}

.ps-editor__line-numbers {
  font-family: var(--font-code);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-dim);
  text-align: right;
  padding-right: var(--space-3);
  user-select: none;
}

/* Highlight overlay behind textarea */
.ps-editor__highlight {
  position: absolute;
  inset: 0;
  left: 48px;
  padding: var(--space-4);
  font-family: var(--font-code);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-y: auto;
  pointer-events: none;
  z-index: 1;
}

/* Variable highlight in overlay */
.ps-var {
  background: rgba(167, 139, 250, 0.18);
  color: var(--accent-primary);
  border-radius: 3px;
  padding: 1px 4px;
  border: 1px solid rgba(167, 139, 250, 0.25);
}

/* The actual textarea */
.ps-editor__textarea {
  position: absolute;
  inset: 0;
  left: 48px;
  width: calc(100% - 48px);
  height: 100%;
  padding: var(--space-4);
  font-family: var(--font-code);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-primary);
  caret-color: var(--accent-primary);
  background: transparent;
  border: none;
  resize: none;
  outline: none;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-y: auto;
  z-index: 3;
  tab-size: 2;
}

.ps-editor__textarea::placeholder {
  color: var(--text-muted);
}

.ps-editor__textarea::placeholder {
  color: var(--text-muted);
}

/* --- Draggable divider --- */

.ps-divider {
  width: 5px;
  background: var(--border-subtle);
  cursor: col-resize;
  flex-shrink: 0;
  position: relative;
  transition: background var(--duration-fast) var(--ease-out);
  z-index: 10;
}

.ps-divider:hover,
.ps-divider--active {
  background: var(--accent-primary);
}

.ps-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 3px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--text-dim);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.ps-divider:hover::after {
  opacity: 1;
}

/* --- Preview pane (right) --- */

.ps-preview {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  background: var(--bg-secondary);
  overflow-y: auto;
}

.ps-preview__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-tertiary);
  flex-shrink: 0;
}

.ps-preview__label {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

/* Rendered prompt */
.ps-preview__content {
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-wrap: break-word;
  border-bottom: 1px solid var(--border-subtle);
  min-height: 80px;
}

.ps-preview__content .ps-var-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-family: var(--font-code);
  font-size: 0.8em;
  font-weight: var(--font-medium);
  background: rgba(167, 139, 250, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(167, 139, 250, 0.2);
  border-radius: var(--radius-full);
  margin: 0 2px;
}

.ps-preview__content .ps-var-badge::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-primary);
  margin-right: 5px;
  opacity: 0.6;
}

/* --- Detected variables --- */

.ps-variables-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.ps-variables-bar__label {
  font-size: 10px;
  font-weight: var(--font-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  flex-shrink: 0;
}

.ps-variables-bar__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.ps-var-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  background: rgba(167, 139, 250, 0.08);
  border: 1px solid rgba(167, 139, 250, 0.15);
  border-radius: var(--radius-full);
  font-family: var(--font-code);
  font-size: 11px;
  color: var(--accent-primary);
}

/* --- Token count --- */

.ps-tokens {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

.ps-tokens__number {
  font-family: var(--font-accent);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  transition: color var(--duration-fast) var(--ease-out);
}

.ps-tokens__number--empty {
  color: var(--text-dim);
}

.ps-tokens__label {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* --- Stats row --- */

.ps-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

.ps-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-3);
  background: var(--bg-inset);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.ps-stat__value {
  font-family: var(--font-code);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.ps-stat__label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

/* --- Cost table --- */

.ps-costs {
  padding: var(--space-4) var(--space-6);
}

.ps-costs__title {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-3);
}

.ps-cost-table {
  width: 100%;
  border-collapse: collapse;
}

.ps-cost-table th {
  text-align: left;
  font-size: 10px;
  font-weight: var(--font-medium);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}

.ps-cost-table th:last-child {
  text-align: right;
}

.ps-cost-table td {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  border-bottom: 1px solid rgba(39, 39, 42, 0.5);
}

.ps-cost-table td:last-child {
  text-align: right;
  font-family: var(--font-code);
  font-weight: var(--font-medium);
}

.ps-cost-table tr:last-child td {
  border-bottom: none;
}

.ps-cost-table .model-name {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ps-cost-table .model-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.ps-cost-table .model-dot--openai { background: #10a37f; }
.ps-cost-table .model-dot--openai-mini { background: #34d399; }
.ps-cost-table .model-dot--claude { background: #d97706; }
.ps-cost-table .model-dot--opus { background: #c026d3; }
.ps-cost-table .model-dot--gemini { background: #4285f4; }

/* --- Bottom bar --- */

.ps-bottombar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-6);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-tertiary);
  flex-shrink: 0;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.ps-bottombar__left,
.ps-bottombar__right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.ps-bottombar__stat {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.ps-bottombar__stat-value {
  font-family: var(--font-code);
  color: var(--text-secondary);
}

.ps-bottombar__save {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--accent-tertiary);
}

.ps-bottombar__save--saving {
  color: var(--accent-warm);
}

/* --- Sidebars (templates / versions) --- */

.ps-sidebar {
  position: fixed;
  top: 0;
  right: -380px;
  width: 380px;
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  transition: right var(--duration-slow) var(--ease-out);
  box-shadow: var(--shadow-xl);
}

.ps-sidebar--open {
  right: 0;
}

.ps-sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.ps-sidebar__title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.ps-sidebar__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: none;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: var(--text-sm);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.ps-sidebar__close:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
  border-color: var(--border-default);
}

.ps-sidebar__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3);
}

/* Overlay behind sidebar */
.ps-sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal) var(--ease-out);
}

.ps-sidebar-overlay--visible {
  opacity: 1;
  visibility: visible;
}

/* Template cards */
.ps-template {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  margin-bottom: var(--space-2);
}

.ps-template:hover {
  border-color: var(--border-default);
  background: var(--bg-elevated);
  transform: translateY(-1px);
}

.ps-template__name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.ps-template__desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: var(--leading-snug);
}

.ps-template__tag {
  display: inline-flex;
  align-items: center;
  padding: 1px 6px;
  font-size: 10px;
  font-weight: var(--font-medium);
  font-family: var(--font-code);
  background: rgba(167, 139, 250, 0.1);
  color: var(--accent-primary);
  border-radius: var(--radius-full);
  width: fit-content;
  margin-top: 2px;
}

/* Version items */
.ps-version {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.ps-version:hover {
  border-color: var(--border-default);
  background: var(--bg-elevated);
}

.ps-version__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.ps-version__time {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ps-version__meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-code);
}

.ps-version__actions {
  display: flex;
  gap: var(--space-1);
  flex-shrink: 0;
}

.ps-version__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: none;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.ps-version__btn:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.ps-version__btn--delete:hover {
  color: var(--color-error);
  background: rgba(248, 113, 113, 0.1);
}

.ps-versions__empty {
  text-align: center;
  padding: var(--space-12) var(--space-4);
  color: var(--text-muted);
  font-size: var(--text-sm);
}

/* --- Export modal --- */

.ps-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal) var(--ease-out);
}

.ps-modal-overlay--open {
  opacity: 1;
  visibility: visible;
}

.ps-modal {
  width: 90%;
  max-width: 400px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--duration-normal) var(--ease-out);
}

.ps-modal-overlay--open .ps-modal {
  transform: scale(1) translateY(0);
}

.ps-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

.ps-modal__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.ps-modal__body {
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.ps-export-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
  width: 100%;
  text-align: left;
}

.ps-export-btn:hover {
  border-color: var(--border-default);
  background: var(--bg-elevated);
}

.ps-export-btn__icon {
  font-size: var(--text-lg);
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.ps-export-btn__label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.ps-export-btn__desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* --- Toast notification --- */

.ps-toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: var(--space-3) var(--space-5);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-toast);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal) var(--ease-out);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.ps-toast--visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.ps-toast svg {
  width: 16px;
  height: 16px;
  color: var(--accent-tertiary);
  flex-shrink: 0;
}

/* --- Empty prompt placeholder in preview --- */

.ps-preview__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-muted);
  font-size: var(--text-sm);
  text-align: center;
  gap: var(--space-2);
  padding: var(--space-8);
}

.ps-preview__empty-icon {
  opacity: 0.2;
}

.ps-preview__empty-icon svg {
  width: 48px;
  height: 48px;
}

/* --- Responsive --- */

@media (max-width: 900px) {
  .ps-header {
    padding: var(--space-2) var(--space-4);
  }

  .ps-header__title {
    font-size: var(--text-base);
  }

  .ps-header__status {
    display: none;
  }

  .ps-workspace {
    flex-direction: column;
  }

  .ps-editor {
    flex: none;
    height: 45vh;
  }

  .ps-preview {
    flex: 1;
    min-height: 0;
  }

  .ps-divider {
    width: 100%;
    height: 5px;
    cursor: row-resize;
  }

  .ps-divider::after {
    width: 32px;
    height: 3px;
  }

  .ps-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
  }

  .ps-tokens {
    padding: var(--space-3) var(--space-4);
  }

  .ps-costs {
    padding: var(--space-3) var(--space-4);
  }

  .ps-preview__content {
    padding: var(--space-4);
  }

  .ps-sidebar {
    width: 100%;
    right: -100%;
  }
}

@media (max-width: 600px) {
  .ps-header__right {
    gap: var(--space-1);
  }

  .ps-header__actions .btn__label {
    display: none;
  }

  .ps-bottombar {
    padding: var(--space-2) var(--space-4);
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .ps-editor__gutter {
    width: 36px;
  }

  .ps-editor__highlight,
  .ps-editor__textarea {
    left: 36px;
    width: calc(100% - 36px);
  }

  .ps-tokens__number {
    font-size: var(--text-3xl);
  }
}