:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;
  
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  
  --border-subtle: rgba(226, 232, 240, 0.8);
  --border-card: #e2e8f0;
  
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  
  --accent-color: #2563eb;
  --accent-bg: #eff6ff;
  
  --success-color: #059669;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  
  --warning-color: #d97706;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  
  --danger-color: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  
  --info-color: #0284c7;
  --info-bg: #f0f9ff;
  --info-border: #bae6fd;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

body {
  margin: 0;
  padding: 24px;
  background-color: var(--bg-app);
  font-family: var(--font-sans);
  color: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.ai-view {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Card Foundation */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

/* Hero / TL;DR Summary Card */
.summary-card {
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid var(--border-card);
  border-left: 5px solid var(--accent-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-md);
}

.summary-card .lead {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-main);
  margin: 10px 0 0 0;
  line-height: 1.6;
}

/* Badges & Pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: 9999px;
}
.badge-accent { background: var(--accent-bg); color: var(--accent-color); }
.badge-success { background: var(--success-bg); color: var(--success-color); }
.badge-warning { background: var(--warning-bg); color: var(--warning-color); }
.badge-danger { background: var(--danger-bg); color: var(--danger-color); }
.badge-info { background: var(--info-bg); color: var(--info-color); }

/* Typography */
h1, h2, h3, h4 {
  color: var(--text-main);
  margin-top: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
}
h2 { font-size: 1.3rem; margin-bottom: 12px; }
h3 { font-size: 1.1rem; margin-bottom: 8px; }
p { margin: 0 0 10px 0; }
p:last-child { margin-bottom: 0; }

/* Grid Layouts (Bento) */
.grid {
  display: grid;
  gap: 16px;
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 680px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* Callout Blocks */
.callout {
  border-radius: var(--radius-md);
  padding: 16px 20px;
  border-left: 4px solid;
  margin: 4px 0;
  font-size: 0.95rem;
}
.callout-header {
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.callout-info {
  background-color: var(--info-bg);
  border-color: var(--info-color);
  color: #0369a1;
}
.callout-warning {
  background-color: var(--warning-bg);
  border-color: var(--warning-color);
  color: #92400e;
}
.callout-danger {
  background-color: var(--danger-bg);
  border-color: var(--danger-color);
  color: #991b1b;
}
.callout-success {
  background-color: var(--success-bg);
  border-color: var(--success-color);
  color: #065f46;
}

/* Stepper / Timeline */
.stepper {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  margin: 6px 0;
}
.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-bg);
  color: var(--accent-color);
  border: 2px solid var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}
.step-content {
  flex-grow: 1;
}
.step-content h4 {
  margin: 4px 0 6px 0;
  font-size: 1rem;
}

/* Code Container (macOS style window) */
.code-box {
  background: #0f172a;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin: 8px 0;
}
.code-header {
  background: #1e293b;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.code-dots {
  display: flex;
  gap: 6px;
}
.code-dots i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.code-dots i:nth-child(1) { background: #ef4444; }
.code-dots i:nth-child(2) { background: #f59e0b; }
.code-dots i:nth-child(3) { background: #10b981; }
.code-title {
  color: #94a3b8;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}
.code-box pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  color: #f1f5f9;
}
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: #e2e8f0;
  color: #0f172a;
  padding: 2px 6px;
  border-radius: 4px;
}
.code-box code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Metric / KPI Cards */
.metric-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}
.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
}
.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.metric-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
  margin: 4px 0;
}
.metric-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Modern Minimalist Table */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  margin: 8px 0;
  background: var(--bg-card);
}
.modern-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}
.modern-table th {
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-card);
}
.modern-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-body);
}
.modern-table tr:last-child td {
  border-bottom: none;
}
.modern-table tr:hover td {
  background: #f8fafc;
}
/* Append Thinking Card component to theme.css */
.thinking-card {
  background: var(--bg-subtle);
  border: 1px dashed var(--border-card);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  margin-bottom: 8px;
  transition: all 0.2s ease;
}
.thinking-card[open] {
  background: var(--bg-card);
  border-style: solid;
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}
body.dark-mode .thinking-card {
  border-color: #374151;
  background: #11182788;
}
body.dark-mode .thinking-card[open] {
  background: #1f2937;
  border-color: #4b5563;
}
.thinking-header {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
  list-style: none; /* Hide default triangle */
}
.thinking-header::-webkit-details-marker {
  display: none;
}
.thinking-icon {
  font-size: 1.1rem;
}
.thinking-title {
  color: var(--text-main);
  flex-grow: 1;
}
.thinking-badge {
  font-size: 0.72rem;
  background: #ede9fe;
  color: #6d28d9;
  padding: 2px 8px;
  border-radius: 9999px;
  font-weight: 700;
}
body.dark-mode .thinking-badge {
  background: #4c1d9555;
  color: #c4b5fd;
}
.thinking-body {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-muted);
  font-family: var(--font-sans);
}
.thinking-step {
  margin-bottom: 8px;
}
.thinking-step strong {
  color: var(--text-main);
}
.thinking-math {
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-main);
}

/* Aliases for thinking and summary classes */
.thinking {
  background: var(--bg-subtle);
  border: 1px dashed var(--border-card);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  margin-bottom: 12px;
  transition: all 0.2s ease;
}
.thinking[open] {
  background: var(--bg-card);
  border-style: solid;
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}
body.dark-mode .thinking {
  border-color: #374151;
  background: #11182788;
}
body.dark-mode .thinking[open] {
  background: #1f2937;
  border-color: #4b5563;
}

.summary {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-left: 5px solid var(--accent-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-md);
  margin-top: 10px;
}
.summary .lead {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-main);
  margin: 10px 0 0 0;
  line-height: 1.6;
}

/* Modern List System (Kills the Markdown / 90s bullet look) */
.ai-view ul {
  list-style: none !important;
  padding-left: 0 !important;
  margin: 12px 0 !important;
  display: flex !important;
  flex-direction: column !important;
  gap: 8px !important;
}

.ai-view ul li {
  position: relative !important;
  padding: 8px 14px 8px 30px !important;
  background: rgba(0, 0, 0, 0.02) !important;
  border-radius: var(--radius-sm, 8px) !important;
  border: 1px solid rgba(0, 0, 0, 0.05) !important;
  color: var(--text-body) !important;
  line-height: 1.5 !important;
  font-size: 0.92rem !important;
  transition: all 0.15s ease !important;
}

.ai-view ul li:hover {
  background: rgba(37, 99, 235, 0.04) !important;
  border-color: rgba(37, 99, 235, 0.15) !important;
}

.ai-view ul li::before {
  content: "" !important;
  position: absolute !important;
  left: 12px !important;
  top: 14px !important;
  width: 7px !important;
  height: 7px !important;
  border-radius: 50% !important;
  background: var(--accent-color, #2563eb) !important;
  box-shadow: 0 0 0 3px var(--accent-bg, rgba(37, 99, 235, 0.15)) !important;
}

/* Grid Child Auto-Cardify: if model outputs bare <div> inside .grid, give it card polish */
.grid > div:not(.card) {
  background: #f8fafc !important;
  border: 1px solid var(--border-card, #e2e8f0) !important;
  border-radius: var(--radius-md, 12px) !important;
  padding: 18px 20px !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02) !important;
}

.grid > div:not(.card) h3 {
  margin-bottom: 12px !important;
  padding-bottom: 6px !important;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06) !important;
}

/* Auto-span single child in grid (Prevents blank ghost columns when model outputs only 1 child) */
.grid > :only-child,
.grid-2 > :only-child,
.grid-3 > :only-child {
  grid-column: 1 / -1 !important;
}

/* Grid Child Container Safety: Never allow child to burst out of grid track */
.grid > div,
.grid-2 > div,
.grid-3 > div {
  min-width: 0 !important;
  box-sizing: border-box !important;
}

/* Feature List & Item (Upgraded from old-school bullet points; clean vertical card flow) */
.feature-list {
  display: flex !important;
  flex-direction: column !important;
  gap: 8px !important;
  margin: 10px 0 !important;
  width: 100% !important;
  box-sizing: border-box !important;
}

.feature-item {
  display: flex !important;
  flex-direction: column !important;
  align-items: flex-start !important;
  gap: 6px !important;
  padding: 10px 14px !important;
  background: #ffffff !important;
  border-radius: var(--radius-sm, 8px) !important;
  border: 1px solid var(--border-card, #e2e8f0) !important;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02) !important;
  transition: all 0.15s ease !important;
  width: 100% !important;
  box-sizing: border-box !important;
}

.feature-item:hover {
  border-color: #cbd5e1 !important;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.04) !important;
}

.feature-item .badge {
  font-size: 0.72rem !important;
  padding: 2px 8px !important;
  line-height: 1.4 !important;
  display: inline-flex !important;
}

.feature-item p {
  margin: 0 !important;
  font-size: 0.88rem !important;
  color: var(--text-body, #334155) !important;
  line-height: 1.5 !important;
  width: 100% !important;
}

.feature-item:hover {
  border-color: #cbd5e1 !important;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.04) !important;
  transform: translateX(2px) !important;
}

.feature-item .badge {
  flex-shrink: 0 !important;
  margin-top: 1px !important;
  font-size: 0.75rem !important;
}

.feature-item p {
  margin: 0 !important;
  font-size: 0.92rem !important;
  color: var(--text-body, #334155) !important;
  line-height: 1.5 !important;
  flex-grow: 1 !important;
}

answer {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--accent-color);
  background: var(--accent-bg);
  border: 1px solid rgba(37, 99, 235, 0.25);
  padding: 2px 10px;
  border-radius: 6px;
  letter-spacing: -0.01em;
}