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

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --text-primary: #eaeaea;
  --text-secondary: #a0a0b8;
  --accent: #e94560;
  --accent-glow: rgba(233, 69, 96, 0.3);
  --accent-secondary: #0f3460;
  --border: #2a2a4a;
  --success: #4ecca3;
  --warning: #f0a500;
  --font-mono: 'Courier New', Courier, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.logo-text {
  letter-spacing: 0.5px;
}

.site-nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
}

/* Main */
main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

/* App Shell */
.app-shell {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
}

.app-main {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.app-main h1 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
  color: var(--accent);
  letter-spacing: 0.3px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

/* Form */
.synthesis-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group select {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%23a0a0b8'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.form-group select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #c73a50;
  box-shadow: 0 0 16px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--accent-secondary);
  border-color: var(--accent);
}

.btn-small {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}

/* Result Panel */
.result-panel {
  min-height: 200px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1rem;
  text-align: center;
  color: var(--text-secondary);
  gap: 0.75rem;
}

.empty-state svg {
  opacity: 0.6;
  margin-bottom: 0.5rem;
}

.empty-state .hint {
  font-size: 0.85rem;
  opacity: 0.7;
}

.concept-display {
  animation: fadeIn 0.3s ease;
}

.concept-display.hidden,
.empty-state.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.concept-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.concept-header h2 {
  font-size: 1.3rem;
  color: var(--accent);
}

.color-badges {
  display: flex;
  gap: 0.3rem;
}

.color-badges span {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.2);
}

.concept-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.concept-section h3 {
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.concept-section p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.card-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.card-list li {
  background: var(--bg-card);
  padding: 0.3rem 0.65rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.concept-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

/* Sidebar */
.app-sidebar {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  align-self: start;
  position: sticky;
  top: 80px;
}

@media (max-width: 860px) {
  .app-sidebar {
    position: static;
  }
}

.app-sidebar h2 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 0.75rem;
}

.history-empty {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-style: italic;
}

.history-item {
  background: var(--bg-card);
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1px solid var(--border);
  transition: border-color var(--transition);
  font-size: 0.85rem;
}

.history-item:hover {
  border-color: var(--accent);
}

.history-item .history-name {
  font-weight: 600;
  color: var(--text-primary);
}

.history-item .history-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Support Content */
.support-content {
  margin-bottom: 2rem;
}

.support-content h2 {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.walkthrough {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.walk-step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.walk-step h3 {
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.walk-step p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.comparison-table-wrapper {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.comparison-table th,
.comparison-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.comparison-table th {
  background: var(--bg-card);
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.8rem;
}

.comparison-table tbody tr:hover {
  background: var(--bg-card);
}

.mistakes-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mistakes-list li {
  background: var(--bg-secondary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  border-left: 3px solid var(--warning);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.mistakes-list li strong {
  color: var(--text-primary);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-list dt {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
  cursor: default;
}

.faq-list dd {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-left: 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 1.25rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-meta {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  opacity: 0.7;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Hidden utility */
.hidden {
  display: none !important;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--success);
  color: #000;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  z-index: 200;
  box-shadow: var(--shadow);
  animation: fadeIn 0.3s ease;
}

@media (max-width: 600px) {
  .app-main {
    padding: 1rem;
  }
  .app-main h1 {
    font-size: 1.35rem;
  }
  .form-actions {
    flex-direction: column;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
    text-align: center;
  }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}