/* V2 Layout CSS
 *
 * Main layout system: grid, panels, content area
 * Uses design tokens from tokens.css - no hard-coded values
 *
 * See docs/V2_DESIGN_SYSTEM.md for full documentation.
 */

/* ============================================
 * MAIN LAYOUT
 * ============================================ */

/* Base elements - prevents white flash on overscroll in dark mode */
html, body {
  background-color: var(--color-bg-body);
}

/* V2 Layout Container */
.v2-layout {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  background: var(--color-bg-body);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
}

/* Main Container (below topbar) */
.v2-main-container {
  display: flex;
  min-height: calc(100vh - var(--topbar-height));
  margin-top: var(--topbar-height);
  background: var(--color-bg-body);
}

/* Content Area
 * Uses token-based offsets for consistent spacing:
 * - Left: sidebar width + sidebar left offset + layout gap
 * - Right: matches the page margin for visual balance
 * - Top: consistent spacing from topbar
 *
 * Note: Small horizontal padding (2px) prevents box-shadow clipping
 * on panel edges when overflow-y creates a scroll container.
 */
.v2-content-area {
  flex: 1;
  margin-left: var(--content-left-offset);
  margin-right: var(--content-right-offset);
  padding: var(--content-top-offset) 2px;  /* 2px horizontal padding prevents shadow clipping */
  overflow-y: auto;
  background: var(--color-bg-body);
  transition: margin-left var(--transition-base);
}

/* ============================================
 * PANEL GRID SYSTEM
 * ============================================ */

/* Panel Row Container */
.panel-row {
  display: grid;
  gap: var(--panel-gap);
  margin-bottom: var(--panel-gap);
}

/* Full Width (1 column) */
.panel-row.full-width {
  grid-template-columns: 1fr;
}

/* Two Columns (halves) */
.panel-row.halves {
  grid-template-columns: repeat(2, 1fr);
}

/* Three Columns (thirds) */
.panel-row.thirds {
  grid-template-columns: repeat(3, 1fr);
}

/* Split 1/3 + 2/3 */
.panel-row.split-third-twothirds {
  grid-template-columns: 1fr 2fr;
}

/* Split 2/3 + 1/3 */
.panel-row.split-twothirds-third {
  grid-template-columns: 2fr 1fr;
}

/* ============================================
 * PANEL / CARD BASE
 * ============================================ */

.panel {
  background: var(--color-bg-surface);
  border: none;
  border-radius: var(--panel-border-radius);
  padding: var(--panel-padding);
  box-shadow: var(--shadow-panel);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  padding-bottom: 0;
  border-bottom: none;
}

/* Figma specs: 20px SemiBold, 150% line-height, -2% letter-spacing, #0A0A0A */
.panel-header h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-base);
  letter-spacing: var(--letter-spacing-tight);
}

.panel-body {
  margin-top: 0;
}

.panel-footer {
  margin-top: var(--space-6);
  padding-top: 0;
  border-top: none;
  text-align: center;
}

/* ============================================
 * PANEL ACTIONS
 * ============================================ */

.panel-action {
  color: var(--color-primary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-base);
}

.panel-action:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.view-all-link {
  color: var(--color-primary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.view-all-link:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* ============================================
 * EMPTY STATES
 * ============================================ */

.empty-state {
  text-align: center;
  padding: var(--space-14) var(--space-5);
}

.empty-icon {
  font-size: var(--font-size-display);
  color: var(--color-text-disabled);
  margin-bottom: var(--space-5);
}

.empty-text h3 {
  margin: 0 0 var(--space-3) 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
}

.empty-text p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-base);
}

/* ============================================
 * PAGE HEADERS
 * ============================================ */

.page-header {
  margin-bottom: var(--space-6);
}

.page-header h1 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.page-header p,
.page-description {
  margin: 0;
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.page-subtitle {
  margin: 0;
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
}

/* ============================================
 * PAGE GRID LAYOUTS
 * ============================================ */

/* Two column grid */
.page-grid {
  display: grid;
  gap: var(--space-6);
}

.page-grid-2 {
  grid-template-columns: 1fr 1fr;
}

.page-grid-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

/* Responsive: stack on mobile */
@media (max-width: 768px) {
  .page-grid-2,
  .page-grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Page section within grid */
.page-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ============================================
 * MODULE PAGE LAYOUT
 * ============================================ */

/* Hub/Module page container */
.v2-hub-page,
.v2-module-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* Hub/Module header */
.hub-header,
.module-header {
  margin-bottom: var(--space-4);
}

.hub-header h1,
.module-header h1 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-base);
  letter-spacing: var(--letter-spacing-tight);
}

.hub-context,
.module-context {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Hub section within module */
.hub-section {
  margin-bottom: var(--space-6);
}

.hub-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-4) 0;
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

/* Hub cards grid */
.hub-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}

/* V2 Card styling - matches v1 card data structure */
.v2-card {
  background: var(--color-bg-surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  cursor: pointer;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.v2-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

/* Card header with optional accent color */
.v2-card .card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.v2-card .card-accent {
  width: 4px;
  height: 24px;
  border-radius: 2px;
  flex-shrink: 0;
}

.v2-card .card-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-text-muted);
  margin: 0;
}

/* Card body */
.v2-card .card-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.v2-card .card-heading {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
}

.v2-card .card-content {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-base);
}

.v2-card .card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-base);
}

/* Card actions/controls */
.v2-card .card-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border-light);
}

.v2-card .card-action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.v2-card .card-action-btn:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.v2-card .card-action-btn img {
  width: 16px;
  height: 16px;
}

/* Module empty states */
.module-empty,
.hub-empty {
  text-align: center;
  padding: var(--space-14) var(--space-5);
}

.module-empty .empty-state,
.hub-empty .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.module-empty .empty-icon,
.hub-empty .empty-icon {
  font-size: var(--font-size-display);
  color: var(--color-text-disabled);
}

.module-empty .empty-text h3,
.hub-empty .empty-text h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
}

.module-empty .empty-text p,
.hub-empty .empty-text p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ============================================
 * RESPONSIVE DESIGN
 * ============================================ */

/* Tablet (1200px and below) */
@media (max-width: 1200px) {
  .panel-row.thirds {
    grid-template-columns: 1fr;
  }

  .panel-row.split-third-twothirds,
  .panel-row.split-twothirds-third {
    grid-template-columns: 1fr;
  }

  .panel-row.halves {
    grid-template-columns: 1fr;
  }
}

/* Mobile (768px and below) - Sidebar overlays, content takes full width */
@media (max-width: 768px) {
  .v2-content-area {
    margin-left: var(--page-margin);
    margin-right: var(--page-margin);
    padding: var(--content-top-offset) 2px;  /* Maintain shadow padding */
  }

  .panel {
    padding: var(--panel-padding);
  }

  .panel-header h2 {
    font-size: var(--font-size-lg);
  }
}

/* Small Mobile (640px and below) */
@media (max-width: 640px) {
  .panel-row {
    gap: var(--panel-gap);
    margin-bottom: var(--panel-gap);
  }

  .v2-content-area {
    margin-left: var(--page-margin);
    margin-right: var(--page-margin);
  }

  .panel {
    padding: var(--panel-padding);
  }
}