/* ── Reset & base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:            #F8F7F5;
  --surface:       #FFFFFF;
  --border:        #E5E3DF;
  --border-dark:   #C8C5C0;
  --text:          #1A1A1A;
  --text-muted:    #8A8780;
  --text-faint:    #B0ADA8;
  --accent:        #1F3D2E;
  --accent-light:  #E8F0EB;
  --amber-bg:      #FFF8E7;
  --amber-border:  #C8960A;
  --blue-bg:       #EFF4FF;
  --blue-border:   #3B6FD4;
  --tag-bg:        #F0EEE9;
  --tag-text:      #6B6966;
  --badge-bg:      #2C2C2A;
  --badge-text:    #FFFFFF;
  --sidebar-w:     220px;
  --panel-w:       500px;
  --radius:        10px;
  --radius-sm:     5px;
  --shadow-card:   0 1px 3px rgba(0,0,0,.06), 0 2px 8px rgba(0,0,0,.04);
  --shadow-hover:  0 6px 28px rgba(0,0,0,.13), 0 2px 6px rgba(0,0,0,.07);
  --shadow-panel:  -8px 0 48px rgba(0,0,0,.13);
  --transition:    150ms ease;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ────────────────────────────────────────────────────────────── */
body {
  display: flex;
  min-height: 100vh;
}

#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface);
  overflow-y: auto;
  z-index: 10;
  box-shadow: 2px 0 12px rgba(0,0,0,.04);
}

#main {
  flex: 1;
  min-width: 0;
  padding: 40px 36px 80px;
  overflow-y: auto;
}

/* ── Sidebar brand ─────────────────────────────────────────────────────── */
.sidebar-brand {
  padding: 28px 20px 22px;
  border-bottom: 1px solid var(--border);
}

.brand-name {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--accent);
}

.brand-tagline {
  display: block;
  font-size: 10.5px;
  color: var(--text-faint);
  margin-top: 4px;
  letter-spacing: .01em;
}

/* ── Category nav ──────────────────────────────────────────────────────── */
#category-nav {
  padding: 10px 0 24px;
}

.cat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 20px;
  cursor: pointer;
  font-size: 12.5px;
  color: var(--text-muted);
  border-left: 3px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  user-select: none;
}

.cat-item:hover {
  color: var(--text);
  background: var(--bg);
}

.cat-item.active {
  color: var(--text);
  font-weight: 600;
  border-left-color: var(--accent);
  background: var(--accent-light);
}

.cat-count {
  font-size: 10.5px;
  color: var(--text-faint);
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}

.cat-item.active .cat-count {
  color: var(--text-muted);
}

/* ── Main header ───────────────────────────────────────────────────────── */
#main-header {
  margin-bottom: 28px;
}

#category-heading {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -.025em;
  color: var(--text);
  margin-bottom: 10px;
}

#subcategory-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ── Card grid ─────────────────────────────────────────────────────────── */
#card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 24px;
}

/* ── Prompt card ───────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  aspect-ratio: 4 / 5;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), box-shadow var(--transition), transform 200ms cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.card:hover {
  border-color: var(--border-dark);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

/* Active state: inset left accent — no layout shift */
.card.active {
  box-shadow: inset 4px 0 0 var(--accent), var(--shadow-hover);
  border-color: rgba(31, 61, 46, 0.28);
}

/* Card image area — fixed proportion of card height */
.card-image {
  position: relative;
  flex: 0 0 57%;
  background: #ECEAE6;
  overflow: hidden;
}

.card-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 220ms ease;
}

.card:hover .card-image img {
  transform: scale(1.04);
}

.card-image-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: .04em;
}

/* Badges overlaid on image */
.badge-row {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  pointer-events: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 7px;
  border-radius: 20px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .07em;
  text-transform: uppercase;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  white-space: nowrap;
}

.badge-category {
  background: rgba(26, 26, 24, 0.76);
  color: rgba(255,255,255,.95);
}

.badge-variants {
  background: rgba(255,255,255,.90);
  color: var(--text-muted);
  margin-left: auto;
  font-weight: 500;
  letter-spacing: .04em;
  text-transform: none;
}

/* Card body */
.card-body {
  flex: 1;
  min-height: 0;
  padding: 13px 16px 15px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow: hidden;
}

.card-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  letter-spacing: -.005em;
}

.card-summary {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Copy button anchored to bottom of card body */
.card-copy-btn {
  margin-top: auto;
  width: 100%;
  padding: 8px 0;
  background: var(--accent);
  color: #FFF;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
}

.card-copy-btn:hover {
  opacity: .86;
}

.card-copy-btn.copied {
  background: #3a7a55;
}

/* ── Detail panel ──────────────────────────────────────────────────────── */
#panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.15);
  z-index: 40;
  backdrop-filter: blur(1px);
  -webkit-backdrop-filter: blur(1px);
}

#detail-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--panel-w);
  max-width: 100vw;
  height: 100vh;
  background: var(--surface);
  border-left: 1px solid var(--border);
  z-index: 50;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 240ms cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: var(--shadow-panel);
}

#detail-panel.open {
  transform: translateX(0);
}

#panel-close {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--surface);
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 18px 22px 14px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}

#panel-close:hover { color: var(--text); }

#panel-content {
  padding: 24px 28px 52px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Panel breadcrumb */
.panel-breadcrumb {
  font-size: 10.5px;
  color: var(--text-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 7px;
}

/* Panel title */
.panel-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.03em;
  color: var(--text);
  line-height: 1.28;
  margin-bottom: 18px;
}

/* Variant tabs */
.variant-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
  overflow-x: auto;
  scrollbar-width: none;
}

.variant-tabs::-webkit-scrollbar { display: none; }

.variant-tab {
  padding: 9px 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  border-radius: 4px 4px 0 0;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  user-select: none;
}

.variant-tab:hover {
  color: var(--text);
  background: rgba(0,0,0,.03);
}

.variant-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* Context-dependent warning */
.context-warning {
  background: var(--blue-bg);
  border-left: 3px solid var(--blue-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 12px;
  color: #1e3a8a;
  margin-bottom: 16px;
  line-height: 1.55;
}

/* Panel image */
.panel-image-wrap {
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 22px;
  background: #ECEAE6;
  cursor: zoom-in;
  position: relative;
  max-height: 360px;
}

.panel-image-wrap img {
  width: 100%;
  height: auto;
  display: block;
  max-height: 360px;
  object-fit: cover;
  transition: transform 200ms ease;
}

.panel-image-wrap:hover img { transform: scale(1.015); }

.panel-image-placeholder {
  width: 100%;
  padding: 44px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-faint);
  background: #F0EEE9;
  border-radius: var(--radius-sm);
  margin-bottom: 22px;
  letter-spacing: .03em;
}

/* Panel summary */
.panel-summary {
  font-size: 14px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 6px;
}

/* Use case */
.panel-usecase-label {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 5px;
  margin-top: 16px;
}

.panel-usecase {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
}

/* Divider */
.panel-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0 22px;
}

/* Prompt section label */
.prompt-section-label {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: .08em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 8px;
}

/* Prompt block */
.prompt-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 16px 12px;
  margin-bottom: 8px;
  position: relative;
}

.prompt-text {
  font-family: 'JetBrains Mono', 'Fira Mono', monospace;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Template note */
.template-note {
  background: var(--amber-bg);
  border-left: 3px solid var(--amber-border);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 11.5px;
  color: #7a5800;
  margin-bottom: 10px;
  line-height: 1.55;
}

/* Panel copy button */
.panel-copy-btn {
  width: 100%;
  padding: 12px 0;
  background: var(--accent);
  color: #FFF;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  margin-top: 10px;
  transition: background var(--transition), opacity var(--transition);
}

.panel-copy-btn:hover { opacity: .86; }
.panel-copy-btn.copied { background: #3a7a55; }

/* Original prompt toggle */
.original-toggle {
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  padding: 8px 0 0;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color var(--transition);
}

.original-toggle:hover { color: var(--text); }

.original-toggle-arrow {
  display: inline-block;
  transition: transform var(--transition);
  font-size: 10px;
}

.original-toggle-arrow.open { transform: rotate(90deg); }

.original-prompt-block {
  display: none;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-top: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.75;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-word;
}

.original-prompt-block.visible { display: block; }

/* Tags row */
.tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 20px;
  margin-bottom: 8px;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: .01em;
}

/* Output type */
.output-type {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 5px;
}

.output-type span { font-weight: 500; color: var(--text); }

/* Notes */
.panel-notes {
  background: var(--amber-bg);
  border-left: 3px solid var(--amber-border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: 12px;
  color: #6b4a00;
  margin-top: 16px;
  line-height: 1.6;
}

.panel-uncertainty {
  border-left-color: var(--border-dark);
  background: #FAF9F7;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 8px;
}

/* ── Lightbox ──────────────────────────────────────────────────────────── */
#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.90);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

#lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #FFF;
  transition: background var(--transition);
}

#lightbox-close:hover { background: rgba(255,255,255,.22); }

#lightbox-img {
  max-width: 100%;
  max-height: calc(100vh - 64px);
  object-fit: contain;
  border-radius: var(--radius-sm);
}

/* ── Toast ─────────────────────────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: #191817;
  color: #FFF;
  font-size: 12px;
  font-weight: 500;
  padding: 9px 22px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 4px 20px rgba(0,0,0,.26), 0 1px 4px rgba(0,0,0,.12);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 200ms cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 200;
  letter-spacing: .04em;
}

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

/* ── Utilities ─────────────────────────────────────────────────────────── */
[hidden] { display: none !important; }