/* =========================================================
   WebResearcher Modern Minimalist UI Design System
   Inspired by Linear / Notion / Stripe Aesthetic
   ========================================================= */

:root {
  --bg-main: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F1F5F9;
  --bg-subtle: #F1F5F9;
  --bg-input: #FFFFFF;
  
  --border-subtle: #E2E8F0;
  --border-focus: #4F46E5;
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  
  --accent-primary: #4F46E5;
  --accent-hover: #4338CA;
  --accent-light: #EEF2FF;
  --accent-text: #4338CA;
  
  --success: #10B981;
  --success-light: #ECFDF5;
  --warning: #F59E0B;
  --warning-light: #FFFBEB;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.03);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  font-size: 1.4rem;
  background-color: var(--accent-light);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.meta-pill {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  color: var(--text-secondary);
}

.meta-pill.status-ready {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--success);
}

/* Main Container */
.main-container {
  max-width: 1180px;
  width: 100%;
  margin: 2rem auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  flex: 1;
}

/* Card Container */
.research-input-card,
.research-monitor-card,
.report-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.section-title h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.section-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

/* Input Area */
.input-group textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-primary);
  resize: vertical;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input-group textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

/* Paradigm Selector Grid */
.paradigm-section {
  margin-top: 1.25rem;
}

.field-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.6rem;
}

.paradigm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.75rem;
}

.paradigm-card {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  cursor: pointer;
  background-color: var(--bg-card);
  transition: all 0.15s ease;
  user-select: none;
}

.paradigm-card:hover {
  background-color: var(--bg-card-hover);
  border-color: #CBD5E1;
}

.paradigm-card.active {
  border-color: var(--accent-primary);
  background-color: var(--accent-light);
  box-shadow: 0 0 0 1px var(--accent-primary);
}

.paradigm-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.paradigm-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.paradigm-desc {
  font-size: 0.76rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Badges */
.badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

.badge-indigo { background: #E0E7FF; color: #4338CA; }
.badge-emerald { background: #D1FAE5; color: #065F46; }
.badge-amber { background: #FEF3C7; color: #92400E; }
.badge-slate { background: #E2E8F0; color: #334155; }
.badge-mode-indicator {
  background: var(--text-primary);
  color: #FFFFFF;
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
}

/* Advanced Accordion */
.advanced-toggle {
  margin-top: 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  user-select: none;
}

.advanced-toggle:hover {
  color: var(--accent-primary);
}

.advanced-panel {
  margin-top: 0.75rem;
  padding: 1rem;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.settings-row {
  display: flex;
  gap: 1rem;
}

.setting-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.setting-item label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.setting-item input {
  padding: 0.45rem 0.65rem;
  font-size: 0.85rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  outline: none;
}

.setting-item input:focus {
  border-color: var(--accent-primary);
}

/* Buttons */
.form-actions {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-primary:disabled {
  background-color: #94A3B8;
  cursor: not-allowed;
}

.btn-secondary {
  background-color: #EF4444;
  color: #FFFFFF;
}

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

.btn-outline:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

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

/* Research Monitor Header */
.monitor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.25rem;
}

.monitor-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.monitor-title h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.pulse-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  background-color: var(--accent-light);
  color: var(--accent-text);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.metrics-bar {
  display: flex;
  gap: 0.5rem;
}

.metric-pill {
  font-size: 0.78rem;
  padding: 0.25rem 0.65rem;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.metric-pill span {
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* Thinking Box (Global Collapsible) */
.thinking-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.thinking-header {
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.thinking-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.thinking-expand-icon {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.thinking-content {
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
  border-top: 1px solid var(--border-subtle);
  background-color: #FFFFFF;
  max-height: 180px;
  overflow-y: auto;
  white-space: pre-wrap;
  font-family: var(--font-mono);
}

/* =========================================================
   Mode-Specific Panel Boxes & Grid Layouts
   ========================================================= */

.mode-view {
  width: 100%;
}

.panel-box {
  background-color: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-box-header {
  padding: 0.75rem 1rem;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-box-sub-header {
  padding: 0.5rem 1rem;
  background-color: #F8FAFC;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
}

.panel-box-body {
  padding: 1rem;
  overflow-y: auto;
}

/* 1. IterResearch View */
.iter-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1rem;
}

.iter-report-box .panel-box-body {
  max-height: 420px;
  background-color: #FFFFFF;
}

.plan-card {
  background-color: var(--accent-light);
  border: 1px solid #C7D2FE;
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.84rem;
}

.plan-card strong {
  color: var(--accent-text);
  display: block;
  margin-bottom: 0.25rem;
}

.action-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 300px;
  overflow-y: auto;
}

.action-item {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  font-size: 0.8rem;
  border-left: 3px solid var(--accent-primary);
}

/* 2. WebWeaver View */
.pipeline-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.step-node {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  transition: all 0.2s ease;
}

.step-node.active {
  background-color: var(--accent-primary);
  color: #FFFFFF;
}

.step-node.active .step-num {
  background-color: #FFFFFF;
  color: var(--accent-primary);
}

.step-num {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.72rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-arrow {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.webweaver-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 1rem;
}

#webweaver-outline-tree {
  max-height: 220px;
  background-color: #FAFAFA;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  white-space: pre-wrap;
}

#webweaver-writer-preview {
  max-height: 200px;
}

.memory-cards-stream {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  max-height: 460px;
}

.memory-card {
  padding: 0.75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8rem;
  transition: border-color 0.15s ease;
}

.memory-card:hover {
  border-color: #CBD5E1;
}

.memory-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.evidence-id-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.72rem;
  padding: 0.1rem 0.4rem;
  background-color: #EEF2FF;
  color: #4338CA;
  border-radius: var(--radius-sm);
}

.memory-card-title {
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  line-height: 1.35;
}

.memory-card-title:hover {
  color: var(--accent-primary);
}

.memory-card-snippet {
  color: var(--text-secondary);
  font-size: 0.76rem;
  line-height: 1.4;
}

/* 3. TTS View */
.tts-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tts-branches-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.85rem;
}

.branch-card {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: #FFFFFF;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.branch-card-header {
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.branch-name {
  font-size: 0.84rem;
  font-weight: 700;
}

.branch-bias-tag {
  padding: 0.5rem 0.85rem;
  background-color: #FAFAFA;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.branch-body {
  padding: 0.75rem;
  max-height: 220px;
  overflow-y: auto;
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tts-synthesizer-box {
  border-left: 4px solid var(--warning);
}

.synthesizer-status-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* 4. ReAct View */
.react-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  max-height: 420px;
}

.timeline-step {
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: #FFFFFF;
  font-size: 0.84rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.timeline-step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Empty Hint */
.empty-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 2rem 1rem;
}

/* Final Report Article (Linear / Notion Clean Markdown) */
.report-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
}

.report-title-group h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.report-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.report-actions {
  display: flex;
  gap: 0.5rem;
}

.markdown-body {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #1E293B;
}

.markdown-body h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.85rem;
  letter-spacing: -0.02em;
}

.markdown-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 1.25rem;
  margin-bottom: 0.65rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.35rem;
}

.markdown-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.markdown-body p {
  margin-bottom: 0.85rem;
}

.markdown-body ul, .markdown-body ol {
  padding-left: 1.5rem;
  margin-bottom: 0.85rem;
}

.markdown-body li {
  margin-bottom: 0.35rem;
}

.markdown-body blockquote {
  border-left: 3px solid var(--accent-primary);
  padding-left: 1rem;
  color: var(--text-secondary);
  font-style: italic;
  margin: 1rem 0;
  background-color: var(--bg-subtle);
  padding: 0.65rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.markdown-body pre {
  background-color: #0F172A;
  color: #F8FAFC;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin: 1rem 0;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--bg-subtle);
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-sm);
  color: var(--accent-text);
}

.markdown-body a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
}

.markdown-body a:hover {
  text-decoration: underline;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-card);
  margin-top: auto;
}

/* Utility classes */
.hidden {
  display: none !important;
}