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

:root {
  --bg: #040714;
  --surface-1: rgba(255,255,255,.03);
  --surface-2: rgba(255,255,255,.06);
  --border-subtle: rgba(255,255,255,.07);
  --border: rgba(255,255,255,.1);
  --border-strong: rgba(255,255,255,.22);
  --text-primary: #f9f9f9;
  --text-secondary: #cacaca;
  --text-muted: rgba(255,255,255,.45);
  --accent: #d946ef;
  --accent-bright: #e879f9;
  --accent-dim: rgba(217, 70, 239, 0.15);
  --font: 'Avenir Next', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 6px; --radius-md: 8px; --radius: 10px; --radius-lg: 15px;
  --ease-snap: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur: 200ms;
  --severity-critical: #ef4444;
  --severity-high: #f97316;
  --severity-medium: #eab308;
  --severity-low: #6b7280;
}

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

/* ── Skip link ───────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute; top: -100%; left: 16px; z-index: 1000;
  padding: 8px 16px; background: var(--accent-bright); color: #000;
  font-weight: 600; font-size: 0.875rem; border-radius: 0 0 6px 6px;
  text-decoration: none; transition: top var(--dur);
}
.skip-link:focus { top: 0; }

/* ── Header ──────────────────────────────────────────────────────────────── */
.header-bar {
  background: linear-gradient(in oklch 135deg, #B015B0 0%, #3D0080 50%, #040714 100%);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 24px; height: 68px;
  position: sticky; top: 0; z-index: 200;
  display: flex; align-items: center;
}
.header-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.header-logo-img {
  height: 36px; width: auto; flex-shrink: 0;
  filter: brightness(0) invert(1);
  transition: transform 0.3s var(--ease-snap);
}
.header-logo-img:hover { transform: scale(1.14) rotate(-9deg); }
.header-logo h1 { font-size: 1.2em; font-weight: 600; color: var(--text-primary); letter-spacing: .5px; }
.header-subtitle { font-size: .82em; color: rgba(255,255,255,.72); font-weight: 500; margin-top: 3px; }

.header-back {
  display: flex; align-items: center; gap: 6px;
  margin-left: 24px;
  padding: 6px 14px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  transition: color var(--dur), background var(--dur), border-color var(--dur);
  white-space: nowrap;
}
.header-back:hover {
  color: var(--text-primary);
  background: var(--surface-2);
  border-color: var(--border);
}
.header-back svg { flex-shrink: 0; }

.header-home {
  display: flex; align-items: center; margin-left: auto; padding: 5px;
  color: rgba(255,255,255,0.9); text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--dur), background var(--dur); flex-shrink: 0;
}
.header-home:hover { color: #fff; background: rgba(255,255,255,0.12); }
.header-home svg { width: 34px; height: 34px; display: block; }

/* ── Tab bar ─────────────────────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255,255,255,.02);
  padding: 0 16px;
}
.tab-btn {
  padding: 14px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color var(--dur), border-color var(--dur);
  white-space: nowrap;
}
.tab-btn:hover {
  color: var(--text-secondary);
}
.tab-btn.active {
  color: var(--accent-bright);
  border-bottom-color: var(--accent-bright);
}

/* ── Search bar ──────────────────────────────────────────────────────────── */
.search-bar {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
}
.search-input {
  width: 100%;
  max-width: 400px;
  padding: 8px 14px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.875rem;
  outline: none;
  transition: border-color var(--dur);
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { border-color: var(--accent); }

/* ── Content area ────────────────────────────────────────────────────────── */
.content-area {
  flex: 1;
  padding: 16px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

/* ── Checklist ───────────────────────────────────────────────────────────── */
.checklist-category {
  margin-bottom: 16px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
}
.checklist-category-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--surface-1);
  cursor: pointer;
  user-select: none;
  transition: background var(--dur);
}
.checklist-category-header:hover { background: var(--surface-2); }
.checklist-category-header .cat-label {
  font-weight: 600;
  font-size: 0.9rem;
  flex: 1;
}
.checklist-category-header .cat-count {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.checklist-category-header .cat-toggle {
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform var(--dur);
}
.checklist-category-header .cat-toggle.collapsed {
  transform: rotate(-90deg);
}
.priority-badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 6px;
  border-radius: 3px;
}
.priority-badge.high { background: rgba(239,68,68,.15); color: #ef4444; }
.priority-badge.medium { background: rgba(234,179,8,.15); color: #eab308; }
.priority-badge.low { background: rgba(107,114,128,.15); color: #9ca3af; }

.checklist-progress {
  height: 3px;
  background: var(--surface-2);
  width: 100%;
}
.checklist-progress-bar {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s ease;
}

.checklist-items {
  border-top: 1px solid var(--border-subtle);
}
.checklist-items.hidden { display: none; }

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--dur);
}
.checklist-item:last-child { border-bottom: none; }
.checklist-item:hover { background: var(--surface-1); }
.checklist-item.checked { opacity: 0.55; }
.checklist-item.checked .cl-label { text-decoration: line-through; }

.checklist-item input[type="checkbox"] {
  width: 18px; height: 18px; margin-top: 2px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}
.checklist-item-content { flex: 1; min-width: 0; }
.cl-label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}
.cl-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.cl-tip {
  font-size: 0.78rem;
  color: var(--text-secondary);
  background: var(--surface-1);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--accent-dim);
  line-height: 1.45;
}

/* ── Mistakes ────────────────────────────────────────────────────────────── */
.mistakes-category {
  margin-bottom: 20px;
}
.mistakes-category-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.mistake-card {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  transition: border-color var(--dur);
}
.mistake-card:hover { border-color: var(--border); }

.mistake-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.mistake-title {
  font-weight: 600;
  font-size: 0.9rem;
  flex: 1;
}
.severity-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: 3px;
}
.severity-badge.critical { background: rgba(239,68,68,.15); color: var(--severity-critical); }
.severity-badge.high { background: rgba(249,115,22,.15); color: var(--severity-high); }
.severity-badge.medium { background: rgba(234,179,8,.15); color: var(--severity-medium); }
.severity-badge.low { background: rgba(107,114,128,.15); color: var(--severity-low); }

.mistake-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}
.mistake-before, .mistake-after {
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  line-height: 1.5;
  word-break: break-word;
}
.mistake-before {
  background: rgba(239,68,68,.08);
  border: 1px solid rgba(239,68,68,.2);
}
.mistake-after {
  background: rgba(34,197,94,.08);
  border: 1px solid rgba(34,197,94,.2);
}
.comp-label {
  display: block;
  font-family: var(--font);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  color: var(--text-muted);
}

.mistake-explanation {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 10px;
}

.mistake-fix {
  font-size: 0.82rem;
  color: var(--text-primary);
  background: var(--surface-2);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--accent);
  line-height: 1.45;
}
.mistake-fix-label {
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-bright);
  display: block;
  margin-bottom: 4px;
}

.mistake-frameworks {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.framework-tag {
  font-size: 0.7rem;
  padding: 3px 8px;
  background: var(--surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}
.framework-tag strong {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ── Prompts ─────────────────────────────────────────────────────────────── */
.prompt-group {
  margin-bottom: 20px;
}
.prompt-group-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.prompt-card {
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  transition: border-color var(--dur);
}
.prompt-card:hover { border-color: var(--border); }

.prompt-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.prompt-title {
  font-weight: 600;
  font-size: 0.875rem;
  flex: 1;
}
.industry-badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--accent-dim);
  color: var(--accent-bright);
}
.industry-badge.fortune { background: rgba(59,130,246,.15); color: #60a5fa; }
.industry-badge.ecommerce { background: rgba(34,197,94,.15); color: #4ade80; }
.industry-badge.gaming { background: rgba(168,85,247,.15); color: #c084fc; }
.industry-badge.saas { background: rgba(14,165,233,.15); color: #38bdf8; }
.industry-badge.fintech { background: rgba(234,179,8,.15); color: #facc15; }

.prompt-text {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
  background: var(--surface-2);
  padding: 12px;
  border-radius: var(--radius-sm);
  position: relative;
  margin-bottom: 0;
}

.prompt-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 8px;
  padding: 5px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--dur), background var(--dur), border-color var(--dur);
}
.prompt-copy-btn:hover {
  color: var(--text-primary);
  background: var(--surface-2);
  border-color: var(--border-strong);
}
.prompt-copy-btn.copied {
  color: #4ade80;
  border-color: rgba(34,197,94,.3);
}

/* ── Empty state ─────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.info-footer {
  text-align: center;
  padding: 24px 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  margin-top: auto;
}
.footer-link {
  color: var(--accent-bright);
  text-decoration: none;
  transition: color var(--dur);
}
.footer-link:hover { color: #fff; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .header-bar { padding: 0 12px; }
  .header-back { display: none; }
  .tab-bar { padding: 0 8px; overflow-x: auto; }
  .tab-btn { padding: 12px 14px; font-size: 0.82rem; }
  .content-area { padding: 12px; }
  .mistake-comparison { grid-template-columns: 1fr; }
  .search-bar { padding: 10px 12px; }
  .search-input { max-width: 100%; }
}

/* ── Component Patterns ──────────────────────────────────────────────────── */
.patterns-container { display: flex; flex-direction: column; gap: 20px; }
.pattern-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.pattern-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}
.pattern-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 0; }
.pattern-components {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface-2);
  padding: 4px 8px;
  border-radius: 4px;
}
.pattern-flow {
  font-family: monospace;
  background: var(--surface-2);
  padding: 12px;
  border-radius: var(--radius-sm);
  margin: 12px 0;
  border-left: 3px solid var(--accent);
}
.pattern-description { margin-bottom: 12px; line-height: 1.5; }
.pattern-example {
  background: rgba(0, 163, 255, 0.1);
  border-left: 3px solid #00a3ff;
  padding: 12px;
  border-radius: 4px;
  margin: 12px 0 16px;
}
.pattern-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.pattern-tag {
  background: var(--accent-dim);
  color: var(--accent-bright);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
}

/* ── Design Systems ─────────────────────────────────────────────────────── */
.design-system-container { display: flex; flex-direction: column; gap: 20px; }
.principle-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.principle-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.principle-description { margin-bottom: 12px; line-height: 1.5; }
.principle-examples {
  list-style: none;
  padding-left: 0;
  margin: 12px 0;
}
.principle-example {
  padding: 6px 0;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-subtle);
}
.principle-example:last-child { border-bottom: none; }
.principle-affected { margin-top: 16px; }
.principle-tag {
  display: inline-block;
  background: var(--surface-2);
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  margin: 4px 4px 0 0;
}

/* ── Accessibility Guide ────────────────────────────────────────────────── */
.accessibility-container { display: flex; flex-direction: column; gap: 24px; }
.accessibility-category {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.accessibility-category-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--accent-dim);
  padding-bottom: 8px;
}
.accessibility-guidelines {
  list-style: none;
  padding-left: 0;
}
.guideline {
  padding: 8px 0 8px 24px;
  position: relative;
}
.guideline::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}
.accessibility-examples { margin-top: 20px; }
.accessibility-examples h4 { margin-bottom: 12px; font-size: 1rem; }
.example-item {
  margin: 12px 0;
  padding: 12px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
}
.example-item strong {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-bright);
}
.example-item code {
  display: block;
  background: rgba(0,0,0,0.3);
  padding: 8px;
  border-radius: 4px;
  font-size: 0.85rem;
  overflow-x: auto;
}

/* ── Framework Code Examples ────────────────────────────────────────────── */
.framework-container { display: flex; flex-direction: column; gap: 24px; }
.framework-section { }
.framework-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--accent-bright);
}
.framework-examples {
  display: grid;
  gap: 16px;
}
.code-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.code-header {
  background: var(--surface-2);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
.code-component {
  font-size: 1rem;
  font-weight: 600;
}
.code-library {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: rgba(255,255,255,0.05);
  padding: 2px 6px;
  border-radius: 4px;
}
.code-block {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.9rem;
}
.code-block code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
}
.code-copy-btn {
  display: block;
  width: calc(100% - 32px);
  margin: 0 16px 16px;
  padding: 8px 16px;
  background: var(--accent-dim);
  color: var(--accent-bright);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background var(--dur);
}
.code-copy-btn:hover { background: var(--accent); color: #000; }