/* ────────────────────────────── static/styles.css ────────────────────────────── */
:root {
  --bg: #0a0e1a;
  --bg-secondary: #111827;
  --card: #1f2937;
  --card-hover: #374151;
  --text: #f9fafb;
  --text-secondary: #d1d5db;
  --muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --pill: #374151;
  --border: #374151;
  --border-light: #4b5563;
  --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-accent: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --sidebar-width: 280px;
}

:root.light {
  --bg: #ffffff;
  --bg-secondary: #f9fafb;
  --card: #ffffff;
  --card-hover: #f3f4f6;
  --text: #111827;
  --text-secondary: #374151;
  --muted: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --pill: #e5e7eb;
  --border: #e5e7eb;
  --border-light: #d1d5db;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* { 
  box-sizing: border-box; 
  margin: 0;
  padding: 0;
}
  
  body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* App Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  transition: transform 0.3s ease;
  overflow-y: auto;
}

/* Desktop: sidebar starts expanded, can be collapsed */
@media (min-width: 1025px) {
  .sidebar.collapsed {
    transform: translateX(-100%);
  }
}

.sidebar-header {
  padding: 24px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  font-size: 32px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text h1 {
  font-size: 20px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
    margin: 0;
}

.logo-text p {
  color: var(--muted);
  font-size: 12px;
  margin: 2px 0 0 0;
}

.sidebar-section {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.sidebar-section:last-child {
  border-bottom: none;
  margin-top: auto;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.section-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Website Menu */
.website-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: transparent;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  color: var(--text-secondary);
}

.menu-item:hover {
  background: var(--bg-secondary);
  border-color: var(--border);
  color: var(--text);
}

.menu-item.active {
  background: var(--gradient-accent);
  border-color: transparent;
  color: white;
}

.menu-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.menu-item span {
  font-weight: 500;
  font-size: 14px;
}

/* Project List */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.project-item:hover {
  background: var(--card-hover);
  border-color: var(--border-light);
}

.project-item.active {
  background: var(--gradient-accent);
  border-color: transparent;
  color: white;
}

.project-item-icon {
  font-size: 16px;
  opacity: 0.7;
}

.project-item-info {
  flex: 1;
  min-width: 0;
}

.project-item-name {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.project-item-description {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.project-item.active .project-item-description {
  color: rgba(255, 255, 255, 0.8);
}

.project-item-actions {
  opacity: 0;
  transition: opacity 0.2s ease;
}

.project-item:hover .project-item-actions {
  opacity: 1;
}

.project-item-delete {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  font-size: 14px;
  transition: background 0.2s ease;
}

.project-item-delete:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* User Info */
.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.user-avatar {
  font-size: 24px;
}

.user-details {
  flex: 1;
  min-width: 0;
}

.user-email {
  display: block;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.theme-toggle-wrapper {
  display: flex;
  justify-content: center;
}

/* Top Bar */
.top-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.hamburger-menu {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hamburger-menu:hover {
  background: var(--bg-secondary);
  color: var(--text);
}

.hamburger-menu svg {
  width: 24px;
  height: 24px;
}

.top-bar-title h2 {
  font-size: 20px;
  font-weight: 600;
    color: var(--text);
  margin: 0;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  background: var(--bg);
  transition: margin-left 0.3s ease;
}

.main-content.sidebar-collapsed {
  margin-left: 0;
}

.content-container {
  max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
  }
  
/* Project Header */
.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 32px;
  padding: 24px;
  background: var(--card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
}

.project-info h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.project-info p {
  color: var(--muted);
  font-size: 16px;
  margin: 0;
}

/* Welcome Screen */
.welcome-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.welcome-content {
  max-width: 480px;
}

.welcome-icon {
  font-size: 64px;
  margin-bottom: 24px;
}

.welcome-content h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-content p {
  color: var(--muted);
  font-size: 18px;
  margin-bottom: 32px;
  line-height: 1.6;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-icon {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

.btn-secondary:hover {
  background: var(--card-hover);
  border-color: var(--border-light);
}

.btn-muted {
  opacity: 0.7;
}

.btn-muted.enabled,
.btn-secondary.enabled {
  opacity: 1;
  border-color: var(--accent);
  color: var(--text);
}

.btn-icon {
  padding: 12px;
  background: var(--card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-icon:hover {
  background: var(--card-hover);
  color: var(--text);
}

/* Cards */
  .card {
    background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
  margin: 32px 0;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover::before {
  opacity: 1;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-light);
}

.card-header {
  margin-bottom: 24px;
  text-align: center;
}

.card-header h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card-header p {
  color: var(--muted);
  font-size: 16px;
}

/* File Drop Zone */
.file-drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--bg-secondary);
  margin-bottom: 24px;
}

.file-drop-zone:hover {
  border-color: var(--accent);
  background: var(--card);
}

.file-drop-zone.dragover {
  border-color: var(--accent);
  background: var(--card);
  transform: scale(1.02);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.drop-zone-icon {
  font-size: 48px;
  opacity: 0.7;
}

.drop-zone-content p {
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
}

.file-types {
  font-size: 14px;
  color: var(--muted);
  padding: 8px 16px;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* File List */
.file-list {
  margin-bottom: 24px;
}

.file-list h4 {
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 16px;
}

.file-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.file-item-icon {
  font-size: 20px;
}

.file-item-name {
  flex: 1;
  color: var(--text);
  font-size: 14px;
}

.file-item-size {
  color: var(--muted);
  font-size: 12px;
}

.file-item-remove {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.file-item-remove:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Upload Progress */
.upload-progress {
  margin-top: 24px;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.progress-header h4 {
  color: var(--text);
  font-size: 18px;
}

.progress-status {
  color: var(--muted);
  font-size: 14px;
}

.progress-bar {
  height: 8px;
  background: var(--card);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 16px;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-success);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-log {
  max-height: 120px;
  overflow-y: auto;
  background: var(--card);
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 12px;
  color: var(--text-secondary);
}

/* Chat */
#chat {
  display: flex;
  flex-direction: column;
  height: 500px;
}

#messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  scroll-behavior: smooth;
}

.msg {
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  margin: 16px 0;
  max-width: 85%;
  white-space: pre-wrap;
  animation: messageSlideIn 0.3s ease;
  position: relative;
}

.msg.user {
  margin-left: auto;
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow);
}

.msg.assistant {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
}

.msg.thinking {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--muted);
  font-style: italic;
}

/* ────────────────────────────── Thinking Container Styles ────────────────────────────── */
.thinking-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.status-text {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.progress-container {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: width 0.3s ease;
  width: 0%;
}

/* Markdown content styling */
.msg.assistant h1,
.msg.assistant h2,
.msg.assistant h3,
.msg.assistant h4,
.msg.assistant h5,
.msg.assistant h6 {
  margin: 16px 0 8px 0;
  color: var(--text);
  font-weight: 600;
}

.msg.assistant h1 { font-size: 1.5em; }
.msg.assistant h2 { font-size: 1.3em; }
.msg.assistant h3 { font-size: 1.1em; }

.msg.assistant p {
  margin: 8px 0;
  line-height: 1.6;
}

.msg.assistant ul,
.msg.assistant ol {
  margin: 8px 0;
  padding-left: 24px;
}

.msg.assistant li {
  margin: 4px 0;
}

.msg.assistant code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.9em;
  color: var(--accent);
}

.msg.assistant pre {
  background: var(--bg);
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow-x: auto;
  margin: 12px 0;
}

.msg.assistant pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

.msg.assistant blockquote {
  border-left: 4px solid var(--accent);
  margin: 12px 0;
  padding-left: 16px;
  color: var(--text-secondary);
  font-style: italic;
}

.msg.assistant strong {
  font-weight: 600;
  color: var(--text);
}

.msg.assistant em {
  font-style: italic;
}

.msg.assistant a {
  color: var(--accent);
  text-decoration: underline;
}

.msg.assistant a:hover {
  color: var(--accent-hover);
}

.msg.assistant table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
}

.msg.assistant th,
.msg.assistant td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.msg.assistant th {
  background: var(--bg);
  font-weight: 600;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.sources {
  margin: 16px 0;
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.sources strong {
  color: var(--text-secondary);
  display: block;
  margin-bottom: 12px;
}

.pill {
  display: inline-block;
  background: var(--pill);
  padding: 6px 12px;
  border-radius: 999px;
  margin: 4px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  font-size: 12px;
  transition: all 0.2s ease;
}

.pill:hover {
  background: var(--card-hover);
  border-color: var(--border-light);
}

/* Chat Controls */
.chat-controls {
  position: sticky;
  bottom: 0;
  background: linear-gradient(180deg, transparent, var(--bg) 20%);
  padding: 16px 0;
}

.chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 0;
  margin-bottom: 8px;
  position: relative;
}

#question {
  flex: 1;
  padding: 12px 16px;
  padding-right: 48px;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 16px;
  transition: all 0.2s ease;
  max-height: calc(1.4em * 7 + 16px);
  overflow: auto;
  resize: none;
}

.send-btn {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--gradient-accent);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.send-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.send-icon {
  pointer-events: none;
  width: 16px;
  height: 16px;
}

.chat-underbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 6px;
}

/* Action pills row */
.action-pills {
  display: flex;
  gap: 12px;
}

.action-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.action-pill:hover {
  background: var(--card-hover);
  border-color: var(--border-light);
}

.action-pill svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.action-pill.active {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow);
}

#question:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#question:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.chat-hint {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  padding: 12px;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* Report output */
.report-output {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  max-height: 420px;
  overflow: auto;
}

/* Code blocks with copy button */
.code-block-wrapper {
  position: relative;
  margin: 16px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.code-block-language {
  font-weight: 600;
  text-transform: uppercase;
}

.copy-code-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-code-btn:hover {
  background: var(--card-hover);
  border-color: var(--border-light);
  color: var(--text);
}

.copy-code-btn.copied {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.copy-code-btn svg {
  width: 12px;
  height: 12px;
}

.code-block-content {
  background: var(--code-bg, #1e1e1e);
  color: var(--code-text, #d4d4d4);
  padding: 16px;
  overflow-x: auto;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 14px;
  line-height: 1.5;
}

/* Download PDF button */
.download-pdf-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 12px 20px;
  background: var(--gradient-accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow);
}

.download-pdf-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.download-pdf-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.download-pdf-btn svg {
  width: 16px;
  height: 16px;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  backdrop-filter: blur(8px);
  animation: modalFadeIn 0.3s ease;
}

.modal.hidden {
  display: none;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  to {
    opacity: 1;
    backdrop-filter: blur(8px);
  }
}

.modal-content {
  width: 100%;
  max-width: 480px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.3s ease;
  overflow: hidden;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  text-align: center;
  padding: 32px 32px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.modal-logo {
  font-size: 48px;
  margin-bottom: 16px;
}

.modal-header h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.modal-subtitle {
  color: var(--muted);
  font-size: 16px;
}

.tabs {
  display: flex;
  gap: 4px;
  margin: 24px 32px 0;
  padding: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
}

.tab {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--muted);
  border-radius: var(--radius);
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s ease;
}

.tab.active {
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow);
}

.tab:hover:not(.active) {
  color: var(--text);
}

.tab-body {
  padding: 24px 32px;
}

.tab-body.hidden {
  display: none;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 16px;
  transition: all 0.2s ease;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

.modal-footer {
  padding: 24px 32px;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.modal-footer p {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px);
}

.loading-overlay.hidden {
  display: none;
}

.loading-content {
  text-align: center;
  color: white;
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 24px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-content h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.loading-content p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 16px;
}

/* Spinner */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    width: 100vw;
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar.collapsed {
    transform: translateX(-100%);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .content-container {
    padding: 16px;
  }
  
  .top-bar {
    padding: 16px;
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 100vw;
  }
  
  .card {
    padding: 24px;
  }
  
  .modal-content {
    margin: 16px;
    max-width: none;
  }
  
  .project-header {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .top-bar {
    padding: 12px 16px;
  }
  
  .top-bar-title h2 {
    font-size: 18px;
  }
  
  .hamburger-menu {
    padding: 6px;
  }
  
  .hamburger-menu svg {
    width: 20px;
    height: 20px;
  }
  
  .sidebar-header {
    padding: 20px;
  }
  
  .sidebar-section {
    padding: 16px 20px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
  
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* Files Page Cards */
.file-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.file-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.file-name {
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-summary {
  color: var(--text-secondary);
  line-height: 1.6;
  text-align: justify;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.file-summary.expanded {
  display: block;
  -webkit-line-clamp: unset;
  overflow: visible;
}

.file-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.file-actions-right {
  margin-left: auto;
}

.btn-danger {
  background: #ef4444;
  color: #fff;
  border: none;
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: filter 0.2s ease;
}

.btn-danger:hover { filter: brightness(1.1); }

.see-more-btn {
  background: transparent;
  color: var(--accent);
  border: none;
  cursor: pointer;
  font-weight: 600;
}