/* ==========================================================================
   Stardust Agent · 研写智能体 Design System
   Inspired by: Dify, Cursor, PaperCopilot & Linear Minimalist Aesthetic
   ========================================================================== */

:root {
  /* Brand Gradients & Accents */
  --stardust-primary: #6366f1;
  --stardust-primary-dark: #4f46e5;
  --stardust-primary-light: #818cf8;
  --stardust-secondary: #8b5cf6;
  --stardust-accent: #06b6d4;
  --stardust-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --stardust-gradient-subtle: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.06) 50%, rgba(6, 182, 212, 0.04) 100%);
  --stardust-glow: rgba(99, 102, 241, 0.28);
  --stardust-glow-subtle: rgba(99, 102, 241, 0.12);

  /* Surfaces & Backgrounds */
  --bg-app: #f8fafc;
  --bg-sidebar: #ffffff;
  --bg-topbar: rgba(255, 255, 255, 0.88);
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-subtle-hover: #e2e8f0;
  --bg-active: #eef2ff;

  /* Typography Colors */
  --text-main: #0f172a;
  --text-heading: #1e293b;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --text-inverse: #ffffff;

  /* Borders & Dividers */
  --border-light: #e2e8f0;
  --border-subtle: #f1f5f9;
  --border-focus: #818cf8;
  --border-active: #c7d2fe;

  /* Semantics */
  --success: #10b981;
  --success-dark: #047857;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --warning: #f59e0b;
  --warning-dark: #b45309;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --info: #3b82f6;
  --info-bg: #eff6ff;
  --info-border: #bfdbfe;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 5px 0 rgba(15, 23, 42, 0.04), 0 1px 2px 0 rgba(15, 23, 42, 0.02);
  --shadow-md: 0 4px 14px -2px rgba(15, 23, 42, 0.07), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.09), 0 4px 10px -2px rgba(15, 23, 42, 0.03);
  --shadow-xl: 0 20px 45px -8px rgba(15, 23, 42, 0.12);
  --shadow-primary: 0 6px 18px -2px rgba(99, 102, 241, 0.35);

  /* Radii */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 9999px;

  /* Layout Widths */
  --sidebar-width: 250px;
  --topbar-height: 60px;
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-main);
  background-color: var(--bg-app);
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  overflow-x: hidden;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* App Shell Layout */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 4px minmax(0, 1fr);
  min-height: 100vh;
  position: relative;
  transition: grid-template-columns 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.app-shell.sidebar-collapsed {
  grid-template-columns: 0px 0px minmax(0, 1fr);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 18px 14px 14px;
  overflow: hidden;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 2px 4px 16px;
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  background: var(--stardust-gradient);
  border-radius: var(--radius-md);
  color: #ffffff;
  display: grid;
  place-items: center;
  font-size: 18px;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.32);
  flex-shrink: 0;
}

.brand-text {
  min-width: 0;
}

.brand-name {
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--stardust-glow-subtle);
  color: var(--stardust-primary);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.new-project {
  width: 100%;
  margin: 4px 0 16px;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border-radius: var(--radius-md);
  background: var(--stardust-gradient);
  color: #ffffff;
  border: none;
  box-shadow: var(--shadow-primary);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.new-project:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -2px rgba(99, 102, 241, 0.42);
}

.new-project:active {
  transform: translateY(0);
}

.side-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 6px 6px;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-subtle);
}

.project-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-right: -4px;
  padding-right: 4px;
}

/* Sidebar Search & Item Enhancements */
.sidebar-search {
  margin: 0 0 10px;
}

.sidebar-search input {
  width: 100%;
  border: 1px solid var(--border-light);
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 11.5px;
  color: var(--text-main);
  outline: none;
  transition: all 0.15s ease;
}

.sidebar-search input:focus {
  background: #ffffff;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--stardust-glow-subtle);
}

.side-count {
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.project-list-empty {
  padding: 18px 10px;
  text-align: center;
  color: var(--text-subtle);
  font-size: 11.5px;
}

.project-item {
  position: relative;
  border: 1px solid transparent;
  text-align: left;
  padding: 7px 9px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  min-width: 0;
  transition: all 0.15s ease;
  font-size: 12.5px;
  width: 100%;
}

.project-item:hover {
  background: var(--bg-subtle);
  color: var(--text-heading);
}

.project-item.active {
  background: var(--bg-active);
  color: var(--stardust-primary-dark);
  border-color: var(--border-active);
}

.proj-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  flex: 1;
}

.proj-title-row {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.proj-icon {
  font-size: 12px;
  flex-shrink: 0;
}

.proj-name {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  color: var(--text-heading);
}

.project-item.active .proj-name {
  color: var(--stardust-primary-dark);
  font-weight: 600;
}

.proj-skill-tag {
  align-self: flex-start;
  font-size: 9.5px;
  font-weight: 500;
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}

.proj-skill-tag.cat-scholarship { background: #fef3c7; color: #92400e; }
.proj-skill-tag.cat-practice { background: #ecfdf5; color: #065f46; }
.proj-skill-tag.cat-competition { background: #eff6ff; color: #1e40af; }
.proj-skill-tag.cat-research { background: #f5f3ff; color: #5b21b6; }

.proj-del-icon {
  display: none;
  font-size: 14px;
  line-height: 1;
  color: var(--text-subtle);
  padding: 2px 5px;
  border-radius: 4px;
  transition: all 0.15s ease;
  cursor: pointer;
}

.project-item:hover .proj-del-icon {
  display: inline-block;
}

.proj-del-icon:hover {
  background: #fee2e2;
  color: #b91c1c;
}

.project-item {
  border: 1px solid transparent;
  text-align: left;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  transition: all 0.15s ease;
  font-size: 12.5px;
  width: 100%;
}

.project-item:hover {
  background: var(--bg-subtle);
  color: var(--text-heading);
}

.project-item.active {
  background: var(--bg-active);
  color: var(--stardust-primary-dark);
  font-weight: 600;
  border-color: var(--border-active);
}

.project-item .proj-icon {
  font-size: 12px;
  color: var(--text-subtle);
  flex-shrink: 0;
}

.project-item.active .proj-icon {
  color: var(--stardust-primary);
}

.project-item span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-footer {
  margin-top: auto;
  padding: 12px 4px 2px;
  border-top: 1px solid var(--border-light);
}

.local-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--text-heading);
  font-weight: 600;
  font-size: 11px;
}

.pulse, .status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
  flex-shrink: 0;
}

.pulse {
  animation: pulse-ring 2.5s infinite;
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.sidebar-footer p {
  margin: 5px 0 0;
  font-size: 10.5px;
  color: var(--text-subtle);
  line-height: 1.45;
}

/* Resize Handles */
.resize-handle {
  width: 4px;
  background: transparent;
  cursor: col-resize;
  position: relative;
  z-index: 25;
  transition: background 0.15s ease;
  user-select: none;
  flex-shrink: 0;
}

.resize-handle:hover, .resize-handle.active {
  background: var(--stardust-primary-light);
  box-shadow: 0 0 8px rgba(99, 102, 241, 0.35);
}

.nav-resize-handle {
  margin-right: -2px;
  margin-left: -2px;
}

.workspace-resize-handle {
  margin-left: -6px;
  margin-right: -6px;
  height: 100%;
}

/* ==========================================================================
   Topbar
   ========================================================================== */
.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: var(--topbar-height);
  background: var(--bg-topbar);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb {
  font-size: 12.5px;
  color: var(--text-muted);
  display: flex;
  gap: 7px;
  align-items: center;
}

.breadcrumb strong {
  color: var(--text-heading);
  font-weight: 600;
  max-width: 260px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.breadcrumb-home {
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: 2px 4px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s ease;
}

.breadcrumb-home:hover {
  color: var(--stardust-primary);
  background: var(--bg-subtle);
}

.crumb-skill-badge {
  font-size: 10.5px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--stardust-glow-subtle);
  color: var(--stardust-primary);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.topbar-export-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
}

.crumb-divider {
  color: #cbd5e1;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.model-status {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11.5px;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  padding: 5px 11px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xs);
  transition: all 0.2s ease;
}

.model-status.offline .status-dot {
  background: var(--warning);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

.model-status.remote-warning {
  color: var(--warning-dark);
  background: var(--warning-bg);
  border-color: var(--warning-border);
}

.model-status.remote-warning .status-dot {
  background: var(--warning);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

.model-settings-button, .toggle-chat-btn {
  border: 1px solid var(--border-light);
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  padding: 6px 11px;
  color: var(--text-heading);
  font-size: 11.5px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  box-shadow: var(--shadow-xs);
  transition: all 0.15s ease;
}

.model-settings-button:hover, .toggle-chat-btn:hover {
  border-color: var(--stardust-primary-light);
  color: var(--stardust-primary-dark);
  background: var(--bg-active);
}

/* ==========================================================================
   Buttons & Form Controls
   ========================================================================== */
.button {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 7px 13px;
  font-weight: 500;
  font-size: 12.5px;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  line-height: 1.4;
  text-decoration: none;
}

.button-primary {
  color: #ffffff;
  background: var(--stardust-primary);
  box-shadow: 0 2px 7px rgba(99, 102, 241, 0.25);
}

.button-primary:hover {
  background: var(--stardust-primary-dark);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
}

.button-primary:active {
  transform: translateY(0);
}

.button-secondary {
  background: var(--bg-surface);
  border-color: var(--border-light);
  color: var(--text-heading);
  box-shadow: var(--shadow-xs);
}

.button-secondary:hover {
  border-color: #cbd5e1;
  background: var(--bg-subtle);
  color: var(--text-heading);
}

.button-quiet {
  color: var(--text-muted);
  background: transparent;
}

.button-quiet:hover {
  background: var(--bg-subtle);
  color: var(--text-heading);
}

.button-small {
  padding: 5px 9px;
  font-size: 11.5px;
  border-radius: 6px;
}

.button-large {
  padding: 10px 18px;
  font-size: 13.5px;
  font-weight: 600;
  border-radius: var(--radius-md);
}

.icon-button {
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font-size: 17px;
  line-height: 1;
  padding: 4px 7px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.icon-button:hover {
  background: var(--bg-subtle);
  color: var(--text-heading);
}

/* ==========================================================================
   Welcome / Hero Section
   ========================================================================== */
.welcome {
  max-width: 1300px;
  margin: 0 auto;
  padding: 48px 36px;
  display: grid;
  grid-template-columns: 1.15fr 0.9fr;
  align-items: center;
  gap: 48px;
  min-height: calc(100vh - var(--topbar-height));
  position: relative;
}

.welcome-copy {
  display: flex;
  flex-direction: column;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 1.4px;
  font-size: 10.5px;
  font-weight: 700;
  color: var(--stardust-primary);
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sparkle {
  color: var(--stardust-accent);
}

.welcome h1 {
  font-size: clamp(30px, 3.8vw, 46px);
  line-height: 1.22;
  letter-spacing: -1px;
  margin: 0 0 16px;
  font-weight: 800;
  color: var(--text-heading);
}

.welcome h1 span {
  background: var(--stardust-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.welcome-desc {
  max-width: 540px;
  color: var(--text-muted);
  line-height: 1.75;
  font-size: 14.5px;
  margin: 0 0 24px;
}

.welcome-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.welcome-points {
  display: grid;
  gap: 12px;
  color: var(--text-muted);
  font-size: 12.5px;
}

.point-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  transition: all 0.2s ease;
}

.point-card:hover {
  transform: translateX(3px);
  border-color: var(--border-active);
  box-shadow: var(--shadow-sm);
}

.point-icon {
  color: var(--stardust-primary);
  font-weight: 700;
  font-size: 11px;
  background: var(--stardust-glow-subtle);
  padding: 3px 7px;
  border-radius: 6px;
  flex-shrink: 0;
}

.point-card strong {
  display: block;
  color: var(--text-heading);
  font-size: 13px;
  margin-bottom: 2px;
}

.point-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Welcome Visual Blueprint */
.welcome-visual {
  position: relative;
  min-height: 380px;
  display: grid;
  place-items: center;
}

.visual-glow {
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.16) 0%, rgba(139, 92, 246, 0.08) 40%, transparent 70%);
  filter: blur(24px);
  pointer-events: none;
}

.paper-card {
  position: relative;
  width: min(420px, 100%);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-xl);
  transform: rotate(-2deg);
  transition: transform 0.3s ease;
}

.paper-card:hover {
  transform: rotate(0deg) scale(1.02);
}

.paper-top {
  display: flex;
  align-items: center;
  gap: 5px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
}

.paper-dot {
  width: 7px;
  height: 7px;
  background: #cbd5e1;
  border-radius: 50%;
}

.paper-title {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-subtle);
  margin-left: auto;
}

.paper-heading {
  font-size: 15px;
  font-weight: 700;
  margin: 18px 0 14px;
  color: var(--text-heading);
}

.mini-flow {
  display: flex;
  align-items: center;
  gap: 7px;
}

.mini-node {
  border: 1px solid var(--border-light);
  background: var(--bg-subtle);
  padding: 8px 10px;
  border-radius: 7px;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
}

.mini-node.blue {
  background: var(--info-bg);
  border-color: var(--info-border);
  color: var(--info);
}

.mini-node.green {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-dark);
}

.mini-flow i {
  height: 1px;
  width: 18px;
  background: #cbd5e1;
  position: relative;
}

.mini-flow i::after {
  content: "›";
  position: absolute;
  right: -3px;
  top: -8px;
  color: #94a3b8;
  font-size: 12px;
}

.paper-lines {
  display: grid;
  gap: 8px;
  margin: 20px 0 14px;
}

.paper-lines span {
  height: 5px;
  width: 95%;
  border-radius: 4px;
  background: #f1f5f9;
}

.paper-lines span.short {
  width: 65%;
}

.paper-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-full);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-dark);
  padding: 3px 9px;
  font-size: 10.5px;
  font-weight: 600;
}

.floating-note, .floating-photo {
  position: absolute;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  padding: 9px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-heading);
  font-size: 11.5px;
  font-weight: 500;
  z-index: 2;
  transition: transform 0.2s ease;
}

.floating-note {
  top: 35px;
  right: -8px;
  transform: rotate(3deg);
}

.note-check {
  display: grid;
  place-items: center;
  background: var(--success-bg);
  color: var(--success-dark);
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-weight: 700;
  font-size: 10px;
}

.floating-photo {
  bottom: 25px;
  left: -12px;
  transform: rotate(-3deg);
}

.photo-mark {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: var(--stardust-glow-subtle);
  color: var(--stardust-primary);
  display: grid;
  place-items: center;
  font-size: 13px;
}

/* ==========================================================================
   Create Panel (Quick Setup Form)
   ========================================================================== */
.create-panel {
  max-width: 780px;
  margin: 32px auto;
  padding: 0 20px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.section-head h2 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-heading);
}

.section-head p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
}

.create-form {
  padding: 28px;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.route-candidates {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
}

.route-candidates p {
  flex-basis: 100%;
  margin: 0 0 4px;
  color: var(--text-muted);
  font-size: 13px;
}

.field {
  display: grid;
  gap: 7px;
  margin-bottom: 16px;
}

.field > span {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-heading);
}

.field em {
  font-style: normal;
  color: var(--text-subtle);
  font-weight: 400;
  font-size: 11px;
  margin-left: 6px;
}

.field input, .field select, .field textarea, .diagram-controls select {
  width: 100%;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  outline: none;
  background: var(--bg-surface);
  color: var(--text-heading);
  transition: all 0.15s ease;
  font-size: 13px;
}

.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.field input::placeholder, .field textarea::placeholder {
  color: var(--text-subtle);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.template-choice {
  border: 1px solid var(--border-light);
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin: 8px 0 10px;
}

.template-choice strong {
  display: block;
  font-size: 12.5px;
  color: var(--text-heading);
}

.template-choice small {
  display: block;
  color: var(--text-muted);
  font-size: 11px;
  margin-top: 3px;
}

.choice-buttons {
  display: flex;
  gap: 5px;
  background: #e2e8f0;
  padding: 3px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.choice-buttons label {
  cursor: pointer;
}

.choice-buttons input {
  display: none;
}

.choice-buttons span {
  display: block;
  padding: 6px 12px;
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 500;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.choice-buttons input:checked + span {
  background: #ffffff;
  box-shadow: var(--shadow-xs);
  color: var(--stardust-primary-dark);
  font-weight: 600;
}

.template-explain {
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--text-muted);
  margin: 6px 0 20px;
  padding-left: 2px;
}

.create-form > button {
  width: 100%;
}

/* ==========================================================================
   Workspace Section
   ========================================================================== */
.workspace {
  max-width: 1600px;
  margin: 0 auto;
  padding: 18px 24px 48px;
  width: 100%;
}

/* Project Heading Banner */
.project-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-light);
}

.project-title-wrap .eyebrow {
  margin-bottom: 4px;
}

.project-heading h1 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.3px;
  margin: 0 0 6px;
  color: var(--text-heading);
}

.project-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.meta-badge {
  padding: 2px 8px;
  background: var(--stardust-glow-subtle);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-full);
  color: var(--stardust-primary);
  font-weight: 600;
  font-size: 11px;
}

.meta-sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #cbd5e1;
}

.danger-text {
  color: var(--danger);
}
.danger-text:hover {
  background: var(--danger-bg);
  color: #b91c1c;
}

/* Template Status Alert */
.template-status {
  margin: 0 0 16px;
  padding: 10px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-muted);
  box-shadow: var(--shadow-xs);
  display: flex;
  align-items: center;
  gap: 8px;
}

.template-status.warning {
  border-color: var(--warning-border);
  background: var(--warning-bg);
  color: var(--warning-dark);
}

.template-status.ready {
  border-color: var(--success-border);
  background: var(--success-bg);
  color: var(--success-dark);
}

/* Workspace Stage Stepper Navigation */
.workspace-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  padding: 2px 0 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.workspace-tab-btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  padding: 6px 11px;
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  font-weight: 500;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
}

.workspace-tab-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-heading);
}

.workspace-tab-btn.active {
  background: var(--bg-surface);
  color: var(--stardust-primary-dark);
  font-weight: 600;
  border-color: var(--border-light);
  box-shadow: var(--shadow-xs);
}

/* Workspace Grid: Main Panels + Splitter + Copilot Column */
.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) 4px minmax(320px, 0.95fr);
  gap: 14px;
  align-items: start;
  transition: grid-template-columns 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.workspace-grid.chat-collapsed {
  grid-template-columns: minmax(0, 1fr) 0px 0px;
}

.workspace-grid.chat-collapsed .assistant-column,
.workspace-grid.chat-collapsed .workspace-resize-handle {
  display: none !important;
}

.workspace-main {
  display: grid;
  gap: 16px;
  min-width: 0;
}

/* Panel Card Common */
.panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  position: relative;
  min-width: 0;
  transition: box-shadow 0.2s ease;
}

.panel:hover {
  box-shadow: var(--shadow-md);
}

.panel-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.panel-heading h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-heading);
  margin: 0 0 3px;
}

.panel-heading p {
  font-size: 11.5px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.45;
}

.panel-heading > div:nth-child(2) {
  min-width: 0;
  flex: 1;
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  font-size: 16px;
  flex-shrink: 0;
}

.icon-lilac { background: #e0e7ff; color: #4338ca; }
.icon-mint { background: #d1fae5; color: #047857; }
.icon-peach { background: #ffedd5; color: #c2410c; }
.icon-blue { background: #dbeafe; color: #1d4ed8; }
.icon-yellow { background: #fef3c7; color: #b45309; }

/* Panel 1: Materials & Uploads */
.upload-tabs {
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.upload-tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 7px 12px;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  margin-bottom: -1px;
  transition: all 0.15s ease;
}

.upload-tab:hover {
  color: var(--text-heading);
}

.upload-tab.active {
  color: var(--stardust-primary);
  border-color: var(--stardust-primary);
  font-weight: 600;
}

.upload-zone {
  border: 2px dashed #cbd5e1;
  background: #f8fafc;
  border-radius: var(--radius-md);
  padding: 24px 16px 20px;
  text-align: center;
  transition: all 0.2s ease;
}

.upload-zone.dragover {
  background: #eef2ff;
  border-color: var(--stardust-primary);
  transform: scale(1.005);
}

.upload-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: #e0e7ff;
  color: var(--stardust-primary);
  display: grid;
  place-items: center;
  margin: 0 auto 8px;
  font-size: 20px;
}

.upload-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-heading);
}

.upload-hint {
  font-size: 11px;
  color: var(--text-subtle);
  margin: 4px 0 14px;
}

.documents-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.document-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px;
  background: var(--bg-surface);
  box-shadow: var(--shadow-xs);
  transition: all 0.15s ease;
}

.document-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}

.doc-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-type {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-muted);
  display: grid;
  place-items: center;
  font-size: 10.5px;
  font-weight: 700;
  flex-shrink: 0;
  border: 1px solid var(--border-light);
}

.doc-name {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-heading);
  overflow-wrap: anywhere;
  flex: 1;
}

.doc-state {
  font-size: 10.5px;
  font-weight: 500;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--warning-bg);
  color: var(--warning-dark);
  border: 1px solid var(--warning-border);
}

.doc-state.confirmed {
  background: var(--success-bg);
  color: var(--success-dark);
  border-color: var(--success-border);
}

.doc-warning {
  color: var(--warning-dark);
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font-size: 11px;
  margin-top: 8px;
  line-height: 1.45;
}

.doc-text {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--border-light);
  background: #f8fafc;
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--text-main);
  margin-top: 8px;
  max-height: 180px;
}

.doc-text:focus {
  background: #ffffff;
  border-color: var(--border-focus);
}

.doc-actions {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  align-items: center;
}

.privacy-note {
  font-size: 11px;
  color: var(--text-subtle);
  margin-top: 12px;
  display: flex;
  gap: 6px;
  align-items: center;
  line-height: 1.45;
}

.privacy-note span {
  color: var(--stardust-primary);
  font-weight: 700;
}

.privacy-note.remote-warning {
  color: var(--warning-dark);
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
}

/* Panel 2: Sources & Literature */
.source-search-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.source-search-row input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 12px;
  outline: none;
  background: var(--bg-surface);
}

.source-search-row input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.source-results, .confirmed-sources {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.source-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px;
  background: var(--bg-surface);
  box-shadow: var(--shadow-xs);
}

.source-card h3 {
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.45;
  margin: 0 0 4px;
  color: var(--text-heading);
}

.source-card p {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--text-muted);
  margin: 4px 0;
  max-height: 100px;
  overflow-y: auto;
}

.source-card a {
  font-size: 11.5px;
  color: var(--stardust-primary);
  overflow-wrap: anywhere;
  text-decoration: none;
  display: inline-block;
  margin: 2px 0;
}

.source-card a:hover {
  text-decoration: underline;
}

.source-card .source-warning {
  color: var(--warning-dark);
  font-size: 10.5px;
}

.source-card .button {
  margin-top: 8px;
}

.source-loading {
  font-size: 12px;
  color: var(--text-muted);
  padding: 10px 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Panel 3: Facts Matrix */
.facts-summary {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 8px;
}

.fact-chip {
  border: 1px solid var(--border-light);
  background: #f8fafc;
  border-radius: var(--radius-md);
  padding: 10px 12px;
  min-height: 54px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.15s ease;
}

.fact-chip:hover {
  border-color: #cbd5e1;
  background: #ffffff;
}

.fact-chip small {
  display: block;
  color: var(--text-subtle);
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: 4px;
}

.fact-chip span {
  display: block;
  color: var(--text-heading);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.fact-chip.missing {
  border-style: dashed;
  background: #fdfdfd;
}

.fact-chip.missing span {
  color: var(--text-subtle);
  font-style: italic;
}

.fact-chip .fact-source {
  display: block;
  color: var(--stardust-primary);
  font-size: 10px;
  line-height: 1.35;
  margin-top: 5px;
  background: var(--stardust-glow-subtle);
  padding: 2px 5px;
  border-radius: 4px;
}

.fact-candidates {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.fact-candidate {
  padding: 12px;
  border: 1px solid var(--border-active);
  background: #f5f7ff;
  border-radius: var(--radius-md);
}

.fact-candidate strong {
  font-size: 12.5px;
  color: var(--stardust-primary-dark);
}

.fact-candidate p {
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-heading);
  margin: 4px 0;
}

.fact-candidate small {
  display: block;
  font-size: 11px;
  line-height: 1.45;
  color: var(--text-muted);
}

.fact-candidate .button {
  margin-top: 8px;
}

.facts-editor {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.facts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 14px;
}

.facts-grid .field textarea {
  font-size: 12px;
  line-height: 1.55;
  resize: vertical;
}

/* Panel 4: Outline Architect */
.outline-list {
  display: grid;
  gap: 6px;
}

.outline-row {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  box-shadow: var(--shadow-xs);
  transition: all 0.15s ease;
}

.outline-row:hover {
  border-color: #cbd5e1;
}

.outline-row .drag-mark {
  color: var(--stardust-primary);
  font-size: 11px;
  font-weight: 700;
  background: var(--stardust-glow-subtle);
  padding: 2px 5px;
  border-radius: 4px;
}

.outline-row input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  color: var(--text-heading);
  font-size: 12.5px;
  font-weight: 500;
}

.outline-row input:focus {
  background: #f1f5f9;
  border-radius: 4px;
  padding: 2px 4px;
}

.outline-row .remove-outline {
  border: none;
  background: transparent;
  color: var(--text-subtle);
  font-size: 15px;
  padding: 2px 5px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.outline-row .remove-outline:hover {
  color: var(--text-heading);
  background: var(--bg-subtle);
}

.outline-actions {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.inline-hint {
  font-size: 11.5px;
  color: var(--text-muted);
}

.empty-note {
  font-size: 12px;
  color: var(--text-subtle);
  padding: 14px 0;
  text-align: center;
}

/* Panel 5: Section Drafting Studio */
.draft-sections {
  display: grid;
  gap: 14px;
}

.draft-section {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-surface);
  box-shadow: var(--shadow-xs);
  transition: all 0.15s ease;
}

.draft-section:hover {
  border-color: #cbd5e1;
}

.draft-section-head {
  padding: 10px 14px;
  background: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px solid var(--border-light);
}

.draft-section-head strong {
  font-size: 12.5px;
  color: var(--text-heading);
  font-weight: 600;
}

.draft-section-actions {
  display: flex;
  gap: 5px;
}

.draft-section textarea {
  width: 100%;
  border: none;
  resize: vertical;
  min-height: 125px;
  padding: 12px 14px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--text-main);
  outline: none;
  background: #ffffff;
}

.draft-section textarea:focus {
  background: #fcfdfe;
}

.source-hints {
  padding: 6px 14px;
  color: var(--text-muted);
  font-size: 10.5px;
  border-top: 1px solid var(--border-subtle);
  background: #f8fafc;
}

/* Panel 6: Diagram Studio */
.diagram-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.diagram-controls select {
  width: auto;
  min-width: 160px;
  font-size: 12px;
  padding: 7px 10px;
}

.diagram-editor {
  margin-top: 14px;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.diagram-editor .field {
  margin-bottom: 10px;
}

.diagram-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}

.diagram-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px;
  background: var(--bg-surface);
  box-shadow: var(--shadow-xs);
}

.diagram-card img {
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: contain;
  background: #f8fafc;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.diagram-card h3 {
  font-size: 12px;
  font-weight: 600;
  margin: 6px 0;
  color: var(--text-heading);
}

.diagram-card p {
  font-size: 11px;
  color: var(--text-muted);
  margin: 0 0 8px;
  line-height: 1.45;
}

/* Panel 7: Validation & Export */
.validation-result {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: #f8fafc;
  color: var(--text-heading);
  font-size: 12px;
  line-height: 1.65;
  margin-bottom: 14px;
  border: 1px solid var(--border-light);
}

.validation-result ul {
  padding-left: 18px;
  margin: 6px 0;
}

.validation-result.pass {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-dark);
}

.validation-result.warn {
  background: var(--warning-bg);
  border-color: var(--warning-border);
  color: var(--warning-dark);
}

.optional-review-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--border-light);
}

.optional-review-row strong {
  display: block;
  font-size: 12.5px;
  color: var(--text-heading);
}

.optional-review-row small {
  display: block;
  color: var(--text-muted);
  font-size: 11px;
  margin-top: 3px;
}

.review-result {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--text-heading);
  background: #f8fafc;
}

.review-result strong {
  color: var(--stardust-primary-dark);
  font-size: 13.5px;
}

.review-dimension {
  padding: 7px 0;
  border-top: 1px solid var(--border-subtle);
}

.review-dimension b {
  color: var(--text-heading);
}

.export-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.export-row strong {
  display: block;
  font-size: 13.5px;
  color: var(--text-heading);
}

.export-row small {
  display: block;
  color: var(--text-muted);
  font-size: 11.5px;
  margin-top: 3px;
}

.export-row .button {
  flex-shrink: 0;
}

.export-result {
  margin-top: 10px;
  font-size: 12px;
  color: var(--success-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.export-result a {
  color: #ffffff;
  background: var(--success);
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 11.5px;
}

.export-result a:hover {
  background: var(--success-dark);
}

/* ==========================================================================
   Right Assistant Column: Stardust Agent Chat
   ========================================================================== */
.assistant-column {
  position: sticky;
  top: 74px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-panel {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: calc(100vh - 100px);
  min-height: 520px;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.chat-header {
  height: 58px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 10px;
  flex-shrink: 0;
  background: #f8fafc;
}

.agent-avatar {
  width: 32px;
  height: 32px;
  background: var(--stardust-gradient);
  border-radius: var(--radius-md);
  color: #ffffff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
  box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
  flex-shrink: 0;
}

.chat-header-info {
  flex: 1;
  min-width: 0;
}

.chat-header-info strong {
  font-size: 13px;
  color: var(--text-heading);
  display: block;
}

.chat-header-info small {
  font-size: 10.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 1px;
}

.chat-header-info .status-dot {
  width: 5px;
  height: 5px;
  box-shadow: none;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

.message {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  max-width: 100%;
}

.message.user {
  justify-content: flex-end;
}

.message-avatar {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--stardust-glow-subtle);
  color: var(--stardust-primary);
  display: grid;
  place-items: center;
  font-size: 11px;
  flex-shrink: 0;
  margin-top: 2px;
}

.message.user .message-avatar {
  display: none;
}

.message-bubble {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 4px 12px 12px 12px;
  background: #f1f5f9;
  color: var(--text-heading);
  font-size: 12.5px;
  line-height: 1.65;
  overflow-wrap: anywhere;
  box-shadow: var(--shadow-xs);
}

.message.user .message-bubble {
  background: linear-gradient(135deg, var(--stardust-primary) 0%, #4f46e5 100%);
  color: #ffffff;
  border-radius: 12px 4px 12px 12px;
  box-shadow: 0 3px 10px rgba(99, 102, 241, 0.25);
}

.message.thinking .message-bubble {
  color: var(--text-muted);
  font-style: italic;
  background: #f8fafc;
  border: 1px dashed var(--border-light);
}

/* Markdown styling inside messages */
.message-bubble p {
  margin: 0 0 6px;
}
.message-bubble p:last-child {
  margin-bottom: 0;
}
.message-bubble ul, .message-bubble ol {
  margin: 3px 0 6px;
  padding-left: 16px;
}
.message-bubble li {
  margin-bottom: 3px;
}
.message-bubble h2, .message-bubble h3, .message-bubble h4 {
  margin: 8px 0 4px;
  font-weight: 700;
  line-height: 1.3;
}
.message-bubble code {
  background: rgba(0, 0, 0, 0.06);
  padding: 1px 4px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11.5px;
}
.message.user .message-bubble code {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}
.message-bubble blockquote {
  margin: 4px 0;
  padding-left: 8px;
  border-left: 3px solid var(--stardust-primary);
  color: var(--text-muted);
}

.template-quick-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 14px;
  border-top: 1px solid var(--border-light);
  background: #fdfdfd;
  color: var(--text-muted);
  font-size: 11.5px;
}

.template-quick-actions button {
  border: 1px solid var(--border-active);
  background: #ffffff;
  color: var(--stardust-primary);
  border-radius: var(--radius-full);
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.template-quick-actions button:hover {
  background: var(--stardust-glow-subtle);
  transform: translateY(-1px);
}

.chat-tools {
  padding: 6px 14px 8px;
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  background: #f8fafc;
  border-top: 1px solid var(--border-subtle);
}

.chat-tools button {
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-muted);
  font-size: 11px;
  padding: 4px 8px;
  border-radius: var(--radius-full);
  transition: all 0.15s ease;
}

.chat-tools button:hover {
  color: var(--stardust-primary);
  border-color: var(--stardust-primary-light);
  background: #ffffff;
  box-shadow: var(--shadow-xs);
}

.chat-compose {
  border-top: 1px solid var(--border-light);
  padding: 10px 12px;
  background: #ffffff;
}

.chat-compose textarea {
  resize: none;
  width: 100%;
  border: none;
  outline: none;
  padding: 2px;
  font-size: 13px;
  color: var(--text-heading);
  line-height: 1.55;
  background: transparent;
  max-height: 120px;
}

.chat-compose textarea::placeholder {
  color: var(--text-subtle);
}

.compose-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
  padding-top: 5px;
  border-top: 1px solid var(--border-subtle);
}

.compose-attachments {
  display: flex;
  align-items: center;
  gap: 5px;
}

.attach-button {
  border: 1px solid var(--border-light);
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.attach-button:hover {
  border-color: var(--stardust-primary-light);
  color: var(--stardust-primary);
}

.compose-attachments select {
  max-width: 130px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 4px 6px;
  color: var(--text-muted);
  font-size: 11px;
  outline: none;
}

.compose-help {
  margin-left: auto;
  margin-right: 8px;
  color: var(--text-subtle);
  font-size: 10.5px;
}

.send-button {
  border: none;
  width: 28px;
  height: 28px;
  background: var(--stardust-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  transition: all 0.15s ease;
  box-shadow: 0 2px 5px rgba(99, 102, 241, 0.3);
}

.send-button:hover {
  background: var(--stardust-primary-dark);
  transform: translateY(-1px);
}

.assistant-safety {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  color: var(--text-subtle);
  font-size: 10.5px;
  line-height: 1.45;
  box-shadow: var(--shadow-xs);
}

.safety-icon {
  color: var(--stardust-primary);
  font-size: 12px;
  flex-shrink: 0;
}

/* ==========================================================================
   Model Settings Dialog (Modal)
   ========================================================================== */
.model-settings-dialog {
  width: min(92vw, 520px);
  max-height: 88vh;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 24px;
  background: var(--bg-surface);
  color: var(--text-main);
  box-shadow: var(--shadow-xl);
}

.model-settings-dialog::backdrop {
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.model-settings-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.model-settings-head h2 {
  font-size: 19px;
  font-weight: 700;
  margin: 2px 0 0;
  color: var(--text-heading);
}

.model-settings-intro {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0 0 16px;
}

.model-provider-options {
  display: grid;
  gap: 8px;
}

.model-provider-option {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  background: #ffffff;
}

.model-provider-option:hover {
  border-color: #cbd5e1;
}

.model-provider-option:has(input:checked) {
  border-color: var(--stardust-primary);
  background: #f5f7ff;
}

.model-provider-option input {
  margin-top: 3px;
  accent-color: var(--stardust-primary);
}

.model-provider-option strong {
  display: block;
  font-size: 13px;
  color: var(--text-heading);
}

.model-provider-option small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
  line-height: 1.4;
}

.model-config-fields {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.model-config-fields .field {
  margin: 0;
}

.model-config-fields > small {
  font-size: 11px;
  line-height: 1.45;
  color: var(--text-muted);
}

.model-config-feedback {
  min-height: 18px;
  margin-top: 10px;
  font-size: 11.5px;
  color: var(--text-muted);
}

.model-config-feedback.success {
  color: #059669;
}

.model-config-feedback.error {
  color: #dc2626;
}

.model-settings-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

.model-settings-spacer {
  flex: 1;
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  background: #0f172a;
  color: #ffffff;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.25);
  font-size: 12.5px;
  font-weight: 500;
  max-width: min(90vw, 600px);
  animation: toast-in 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.error {
  background: #991b1b;
}

@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1200px) {
  :root {
    --sidebar-width: 210px;
  }
  .workspace {
    padding: 14px 16px 40px;
  }
  .workspace-grid {
    grid-template-columns: minmax(0, 1.2fr) 4px minmax(290px, 0.9fr);
    gap: 10px;
  }
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: relative;
    top: auto;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    padding: 10px 16px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .brand {
    padding: 0;
  }
  .brand-sub, .side-label, .sidebar-footer, .project-list, .nav-resize-handle, .workspace-resize-handle {
    display: none;
  }
  .new-project {
    width: auto;
    margin: 0;
    padding: 7px 12px;
    font-size: 11.5px;
  }
  .welcome {
    grid-template-columns: 1fr;
    padding: 32px 20px;
    gap: 28px;
  }
  .welcome-visual {
    order: -1;
    min-height: 280px;
  }
  .workspace-grid {
    grid-template-columns: 1fr;
  }
  .assistant-column {
    position: static;
  }
  .chat-panel {
    height: 480px;
    min-height: 440px;
  }
}

@media (max-width: 560px) {
  .welcome h1 {
    font-size: 28px;
  }
  .form-row, .facts-grid, .facts-summary, .diagram-gallery {
    grid-template-columns: 1fr;
  }
  .template-choice {
    flex-direction: column;
    align-items: flex-start;
  }
  .choice-buttons {
    width: 100%;
  }
  .choice-buttons label {
    flex: 1;
  }
  .choice-buttons span {
    text-align: center;
  }
  .export-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .export-row .button {
    width: 100%;
  }
  .topbar {
    padding: 0 14px;
  }
  .compose-help {
    display: none;
  }
}
/* Cloud sign-in gate */
.auth-gate{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:24px;background:radial-gradient(ellipse at 15% 10%,#dfe7ff 0,transparent 40%),radial-gradient(ellipse at 90% 85%,#eee7ff 0,transparent 42%),#f7f8fc}
.auth-card{width:min(100%,430px);padding:36px;border:1px solid #e8ebf3;border-radius:20px;background:#fff;box-shadow:0 24px 80px #29375c1c}
.auth-brand{display:flex;align-items:center;gap:11px;margin-bottom:30px;font-weight:700;font-size:15px;color:#253149}
.auth-card h1{margin:0 0 8px;font-size:26px;letter-spacing:-.4px;color:#202a3c}
.auth-card>p{margin:0 0 22px;color:#7b8799;font-size:12px;line-height:1.7}
.auth-card #authForm .field{margin-bottom:14px}
.auth-card #authForm .button{width:100%;margin-top:5px}
.auth-mode-toggle{display:block;margin:15px auto 0;border:0;background:none;color:#5269c8;font-size:12px;cursor:pointer}
.auth-feedback{min-height:20px;margin-top:12px;color:#a34246;font-size:11px;text-align:center}
.auth-disclaimer{display:block;margin-top:14px;color:#939dad;font-size:10px;line-height:1.6;text-align:center}
/* ==========================================================================
   Welcome Hero Prompt Card
   ========================================================================== */
.welcome-hero-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 18px 20px 16px;
  box-shadow: 0 10px 30px -5px rgba(99, 102, 241, 0.1), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  margin: 0 0 22px;
  transition: all 0.2s ease;
  position: relative;
}

.welcome-hero-card:focus-within {
  border-color: var(--stardust-primary-light);
  box-shadow: 0 12px 35px -4px rgba(99, 102, 241, 0.2), 0 0 0 3px var(--stardust-glow-subtle);
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.hero-chip {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  background: var(--stardust-gradient);
  color: #ffffff;
  letter-spacing: 0.3px;
}

.hero-input-box {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.hero-input-box textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-heading);
  padding: 4px 0;
  background: transparent;
  min-height: 48px;
}

.hero-input-box textarea::placeholder {
  color: var(--text-subtle);
}

.hero-submit-btn {
  flex-shrink: 0;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow-primary);
  transition: all 0.15s ease;
}

.hero-submit-btn:hover {
  transform: translateY(-1px);
}

.hero-quick-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

.tags-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-subtle);
}

.quick-tag-btn {
  border: 1px solid var(--border-light);
  background: var(--bg-subtle);
  color: var(--text-main);
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.quick-tag-btn:hover {
  background: #ffffff;
  border-color: var(--stardust-primary-light);
  color: var(--stardust-primary-dark);
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.15);
  transform: translateY(-1px);
}

/* Project Heading Title Row */
.project-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.project-heading h1 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.3px;
  margin: 0;
  color: var(--text-heading);
  cursor: pointer;
  transition: color 0.15s ease;
}

.project-heading h1:hover {
  color: var(--stardust-primary);
}

.rename-title-btn {
  border: none;
  background: transparent;
  font-size: 13px;
  color: var(--text-subtle);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.rename-title-btn:hover {
  background: var(--bg-subtle);
  color: var(--stardust-primary);
}

.project-heading-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Draft Section Enhancements */
.draft-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.fold-toggle-btn {
  border: none;
  background: transparent;
  font-size: 9px;
  color: var(--text-subtle);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
  line-height: 1;
  transition: all 0.15s ease;
}

.fold-toggle-btn:hover {
  background: var(--bg-subtle-hover);
  color: var(--text-heading);
}

.section-word-badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-light);
}

.draft-section-body {
  transition: all 0.2s ease;
}

.draft-section-body.folded {
  display: none !important;
}

.draft-section.generating {
  border-color: var(--stardust-primary-light);
  box-shadow: 0 0 0 2px var(--stardust-glow-subtle);
}

.draft-section.generating textarea {
  background: #fafafe;
}