/* style.css - DronePlan AI Premium Clean Flat Design Stylesheet */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Sarabun:wght@300;400;500;600;700&display=swap');

:root {
  /* Flat Design Color Palette (Light Mode) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-sidebar: #f1f5f9;
  --border-color: #e2e8f0;
  --border-active: #3b82f6;
  
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-purple: #8b5cf6;
  --accent-purple-hover: #7c3aed;
  --accent-teal: #0d9488;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --table-header: #f8fafc;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --hover-bg: rgba(0, 0, 0, 0.02);
}

.dark-theme {
  /* Cyber Telemetry Premium Dark Mode */
  --bg-primary: #090d16;
  --bg-secondary: #111827;
  --bg-sidebar: #1f2937;
  --border-color: #374151;
  --border-active: #60a5fa;
  
  --accent-blue: #3b82f6;
  --accent-blue-hover: #60a5fa;
  --accent-purple: #a78bfa;
  --accent-purple-hover: #c084fc;
  --accent-teal: #14b8a6;
  
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #6b7280;
  
  --success: #10b981;
  --warning: #fbbf24;
  --error: #f87171;
  --table-header: #1f2937;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --hover-bg: rgba(255, 255, 255, 0.04);
}

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

body {
  font-family: 'Outfit', 'Sarabun', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  background: var(--accent-blue);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  color: #ffffff;
}

.logo-text h1 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.logo-text p {
  font-size: 0.65rem;
  color: var(--accent-blue);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 600;
}

/* API Config Input */
.api-config-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-sidebar);
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.api-config-header label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.api-config-header input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8rem;
  width: 180px;
  outline: none;
}

/* Nav Tabs */
.nav-tabs {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-sidebar);
  padding: 0.25rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--accent-blue);
}

/* Layout Grid */
.app-container {
  display: grid;
  grid-template-columns: 260px 1fr 340px;
  min-height: calc(100vh - 70px);
}

/* Sidebar Stepper */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar h2 {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 1.5px;
  padding-left: 0.5rem;
  font-weight: 700;
}

.stepper {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

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

.step-item.active {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  color: var(--accent-blue);
  font-weight: 600;
}

.step-num {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  border: 1.5px solid var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  transition: all 0.2s ease;
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.step-item.active .step-num {
  border-color: var(--accent-blue);
  background: var(--accent-blue);
  color: #ffffff;
}

.step-item.completed .step-num {
  border-color: var(--success);
  background: var(--success);
  color: #ffffff;
}

.step-label {
  font-size: 0.85rem;
}

/* Workspace Main Panel */
.workspace {
  padding: 2rem;
  overflow-y: auto;
  max-height: calc(100vh - 70px);
}

.step-content {
  display: none;
}

.step-content.active {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Flat Panel Cards */
.glass-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.1rem;
  background: var(--accent-blue);
  border-radius: 2px;
}

/* Form Controls */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

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

.form-group.full-width {
  grid-column: span 2;
}

label.form-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
}

input.form-input, select.form-input, textarea.form-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  outline: none;
  transition: all 0.2s ease;
}

input.form-input:focus, select.form-input:focus, textarea.form-input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

textarea.form-input {
  resize: vertical;
  min-height: 80px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

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

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

.btn-secondary {
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Action Buttons Container */
.actions-container {
  display: flex;
  justify-content: space-between;
  margin-top: 1rem;
}

/* Response Display Container */
.response-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.response-badge {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.08);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-weight: 700;
}

.response-body {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
  color: var(--text-primary);
  min-height: 150px;
}

/* Flat Table Styles */
.response-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: var(--bg-secondary);
}

.response-body th, .response-body td {
  border: 1px solid var(--border-color);
  padding: 0.65rem 0.85rem;
  text-align: left;
  font-size: 0.8rem;
}

.response-body th {
  background: var(--table-header);
  color: var(--text-primary);
  font-weight: 700;
}

.response-body td {
  color: var(--text-secondary);
}

/* Right Sidebar: Review Panel */
.review-panel {
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: 2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-height: calc(100vh - 70px);
  overflow-y: auto;
}

.review-panel h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 1.5px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
  font-weight: 700;
}

.questions-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.question-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.85rem;
}

.question-text {
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.45;
  color: var(--text-secondary);
}

.refinement-box {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.refinement-box label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.refinement-box textarea {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8rem;
  resize: vertical;
  min-height: 80px;
  outline: none;
}

.refinement-box textarea:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.1);
}

/* ================== PROMPT LIBRARY FULL VIEW (GRID LAYOUT) ================== */
.library-full-tab {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  width: 100%;
  animation: fadeIn 0.4s ease;
}

.library-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 1.5rem;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.library-title-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.library-title-section p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Category Filters (Pills) */
.library-category-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-pill {
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-pill:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.filter-pill.active {
  background: var(--accent-purple);
  border-color: var(--accent-purple);
  color: #ffffff;
}

/* Grid of Cards */
.prompt-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
  align-items: start;
}

/* Prompt Card base styling */
.prompt-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.prompt-card:hover {
  border-color: var(--border-active);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.04);
}

.prompt-card.expanded {
  grid-column: span 2; /* Stretch expanded card to occupy more space in grid */
  border-color: var(--accent-purple);
}

@media (max-width: 768px) {
  .prompt-card.expanded {
    grid-column: span 1;
  }
}

/* Header inside Card */
.prompt-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  user-select: none;
}

.prompt-card-emoji {
  font-size: 2.25rem;
  line-height: 1;
  transition: transform 0.2s ease;
}

.prompt-card:hover .prompt-card-emoji {
  transform: scale(1.1);
}

.prompt-card-title-section {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex-grow: 1;
}

.prompt-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
}

.prompt-card-category {
  font-size: 0.65rem;
  text-transform: uppercase;
  color: var(--accent-purple);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.prompt-card-expand-icon {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.prompt-card.expanded .prompt-card-expand-icon {
  transform: rotate(180deg);
  color: var(--accent-purple);
}

/* Card Body Section (Hidden by default) */
.prompt-card-body {
  display: none;
  animation: slideDown 0.3s ease-out;
  border-top: 1px solid var(--border-color);
  margin-top: 0.75rem;
  padding-top: 1rem;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

.prompt-card.expanded .prompt-card-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Inner Layout of Card Body */
.prompt-card-body .prep-guide-box {
  background: rgba(245, 158, 11, 0.05);
  border: 1px dashed var(--warning);
  border-radius: 6px;
  padding: 0.75rem;
  display: flex;
  gap: 0.5rem;
}

.prompt-card-body .prep-guide-icon {
  font-size: 1rem;
  color: var(--warning);
}

.prompt-card-body .prep-guide-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.prompt-card-inner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 600px) {
  .prompt-card-inner-grid {
    grid-template-columns: 1fr;
  }
}

.prompt-card-preview-area {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.prompt-card-preview-text {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.8rem;
  line-height: 1.5;
  white-space: pre-wrap;
  color: var(--text-primary);
  max-height: 320px;
  overflow-y: auto;
  min-height: 180px;
}

/* Copy Toast/Notification */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #10b981;
  color: #ffffff;
  padding: 0.75rem 2rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  opacity: 0;
}

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

/* Loading Spinner */
.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
}

.spinner {
  width: 2.25rem;
  height: 2.25rem;
  border: 3px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--accent-blue);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Flat Upload UI */
.file-upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: 6px;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--bg-primary);
}

.file-upload-zone:hover {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.02);
}

.file-upload-zone input {
  display: none;
}

.file-upload-icon {
  font-size: 2.25rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.file-upload-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.file-upload-text strong {
  color: var(--accent-blue);
}

.image-preview-container {
  margin-top: 1rem;
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  max-width: 100%;
  border: 1px solid var(--border-color);
}

.image-preview {
  display: block;
  max-height: 200px;
  width: auto;
  margin: 0 auto;
}

.image-preview-remove {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--error);
  color: white;
  border: none;
  border-radius: 50%;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-weight: bold;
  font-size: 0.8rem;
}

/* Alert Boxes */
.alert-box {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: 6px;
  font-size: 0.8rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--text-primary);
}

.alert-warning strong {
  color: var(--warning);
}

/* --- DronePlan AI Version 2 Added Styles --- */

/* Visual Cards for Step 1 */
.project-cards-visual-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 0.5rem;
}

.project-card-visual {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.project-card-visual:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-active);
}

.project-card-visual.active {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.04);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.dark-theme .project-card-visual.active {
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4);
}

.visual-card-icon {
  font-size: 2rem;
  color: var(--accent-blue);
}

.visual-card-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.visual-card-desc {
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

/* Helper Tags */
.helper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.4rem;
}

.helper-tag {
  background: rgba(59, 130, 246, 0.05);
  border: 1px solid rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.helper-tag:hover {
  background: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

/* Mood & Tone Tags */
.mood-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.mood-tag {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.mood-tag:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.mood-tag.active {
  background: var(--accent-purple);
  border-color: var(--accent-purple);
  color: #ffffff;
}

/* Hazards Checkbox Grid */
.hazards-checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.hazard-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.hazard-checkbox-label:hover {
  border-color: var(--border-active);
}

.hazard-checkbox-label input[type="checkbox"] {
  margin-top: 0.2rem;
  cursor: pointer;
}

.hazard-checkbox-label span {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

/* 8-Part Prompt Structure Diagram */
.prompt-structure-diagram-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.prompt-part-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: center;
  position: relative;
  transition: transform 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.prompt-part-block:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

.part-number {
  position: absolute;
  top: 0.35rem;
  left: 0.5rem;
  font-size: 0.65rem;
  font-weight: 800;
  color: var(--text-muted);
}

.part-label {
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--text-primary);
  margin-top: 0.5rem;
}

.part-desc {
  font-size: 0.65rem;
  color: var(--text-secondary);
  line-height: 1.3;
}

/* Border highlights for diagram */
.prompt-part-block.border-blue { border-top: 3px solid var(--accent-blue); }
.prompt-part-block.border-purple { border-top: 3px solid var(--accent-purple); }
.prompt-part-block.border-teal { border-top: 3px solid var(--accent-teal); }
.prompt-part-block.border-orange { border-top: 3px solid #f97316; }
.prompt-part-block.border-yellow { border-top: 3px solid #eab308; }
.prompt-part-block.border-red { border-top: 3px solid var(--error); }
.prompt-part-block.border-cyan { border-top: 3px solid #06b6d4; }
.prompt-part-block.border-green { border-top: 3px solid var(--success); }


/* MOBILE RESPONSIVE MEDIA QUERIES */
@media (max-width: 1024px) {
  .app-container {
    grid-template-columns: 200px 1fr;
  }
  .review-panel {
    grid-column: span 2;
    border-left: none;
    border-top: 1px solid var(--border-color);
    max-height: none;
  }
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    align-items: stretch;
  }
  
  .nav-tabs {
    flex-direction: row;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding: 0.25rem;
    gap: 0.25rem;
    -webkit-overflow-scrolling: touch;
  }
  
  .tab-btn {
    flex-shrink: 0;
    padding: 0.45rem 0.75rem;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
  }
  
  .app-container {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
  }
  
  .stepper {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    gap: 0.5rem;
    -webkit-overflow-scrolling: touch;
  }
  
  .step-item {
    flex-shrink: 0;
    padding: 0.5rem 0.75rem;
  }
  
  .step-label {
    display: none; /* Hide labels on tiny screens to save space */
  }
  
  .step-item.active .step-label {
    display: inline; /* Only show active step label */
  }

  .workspace {
    padding: 1rem;
    max-height: none;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-group.full-width {
    grid-column: span 1;
  }
  
  .prompt-structure-diagram-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .review-panel {
    grid-column: span 1;
    padding: 1rem;
  }
  
  .prompt-cards-grid {
    grid-template-columns: 1fr;
  }
  
  .prompt-card.expanded {
    grid-column: span 1;
  }
}

/* Extra small mobile screens helper */
@media (max-width: 520px) {
  .tab-btn span:not(.material-symbols-outlined) {
    display: none;
  }
  .tab-btn {
    padding: 0.5rem;
    aspect-ratio: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
  }
}

.nav-dropdown {
  display: none;
}

@media (max-aspect-ratio: 16/9) {
  .nav-tabs {
    display: none !important;
  }
  .nav-dropdown {
    display: block !important;
  }
}