/* ideafolia — 全局样式 */
/* 浅色主题 + 点阵背景 */

/* ============================================================
   CSS Variables
   ============================================================ */
:root {
  /* Colors */
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-surface-2: #f5f5f5;
  --color-border: #e5e5e5;
  --color-border-hover: #d0d0d0;
  --color-text: #111111;
  --color-text-2: #555555;
  --color-text-3: #999999;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #eff6ff;
  --color-danger: #ef4444;
  --color-danger-light: #fef2f2;
  --color-success: #22c55e;
  --color-success-light: #f0fdf4;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;

  /* Node colors */
  --node-seed-bg: #111111;
  --node-seed-text: #ffffff;
  --node-seed-border: #111111;
  --node-selected-bg: #ffffff;
  --node-selected-border: #2563eb;
  --node-selected-shadow: 0 0 0 2px rgba(37,99,235,0.15);
  --node-candidate-bg: #f8faff;
  --node-candidate-border: #93c5fd;
  --node-candidate-text: #1e40af;
  --node-manual-bg: #ffffff;
  --node-manual-border: #e5e5e5;
  --node-connect-bg: #fefce8;
  --node-connect-border: #fde68a;
  --node-connect-text: #92400e;

  /* Edge colors */
  --edge-branch: #d1d5db;
  --edge-connect: #93c5fd;

  /* Canvas */
  --canvas-bg: #fafafa;
  --dot-color: #d1d5db;
  --dot-size: 1px;
  --dot-gap: 24px;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --text-xs: 11px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 15px;
  --text-lg: 18px;
  --text-xl: 22px;
  --text-2xl: 28px;

  /* Radius */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  /* Transitions */
  --transition: 150ms ease;
  --transition-slow: 250ms ease;

  /* Layout */
  --sidebar-width: 240px;
  --toolbar-width: 56px;
  --topbar-height: 48px;
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
svg { display: block; }
#app { height: 100%; display: flex; flex-direction: column; }

/* ============================================================
   Utility
   ============================================================ */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.w-full { width: 100%; }
.h-full { height: 100%; }

/* ============================================================
   Button
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: 0 var(--space-4); height: 36px; border-radius: var(--radius);
  font-size: var(--text-sm); font-weight: 500;
  transition: background var(--transition), color var(--transition), opacity var(--transition);
  white-space: nowrap; user-select: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--color-text); color: #fff; }
.btn-primary:hover:not(:disabled) { background: #333; }
.btn-secondary { background: var(--color-surface-2); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover:not(:disabled) { background: var(--color-border); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: #dc2626; }
.btn-ghost { color: var(--color-text-2); }
.btn-ghost:hover:not(:disabled) { background: var(--color-surface-2); color: var(--color-text); }
.btn-sm { height: 28px; padding: 0 var(--space-3); font-size: var(--text-xs); }
.btn-icon { width: 32px; height: 32px; padding: 0; border-radius: var(--radius-sm); }

/* ============================================================
   Input
   ============================================================ */
.input {
  width: 100%; height: 40px; padding: 0 var(--space-3);
  border: 1px solid var(--color-border); border-radius: var(--radius);
  background: var(--color-surface); font-size: var(--text-base);
  outline: none; transition: border-color var(--transition), box-shadow var(--transition);
}
.input:focus { border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.input::placeholder { color: var(--color-text-3); }
.input-error { border-color: var(--color-danger); }
.input-error:focus { box-shadow: 0 0 0 3px rgba(239,68,68,0.1); }
.textarea { min-height: 80px; height: auto; padding: var(--space-3); resize: vertical; }

/* ============================================================
   Form
   ============================================================ */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-2); }
.form-error { font-size: var(--text-xs); color: var(--color-danger); }
.form-hint { font-size: var(--text-xs); color: var(--color-text-3); }

/* ============================================================
   Auth Pages
   ============================================================ */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--color-bg); padding: var(--space-4);
}
.auth-card {
  width: 100%; max-width: 400px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-xl);
  padding: var(--space-8); box-shadow: var(--shadow-md);
}
.auth-logo { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-8); }
.auth-logo-text { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.02em; }
.auth-title { font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--space-2); letter-spacing: -0.02em; }
.auth-subtitle { font-size: var(--text-sm); color: var(--color-text-2); margin-bottom: var(--space-6); }
.auth-form { display: flex; flex-direction: column; gap: var(--space-4); }
.auth-divider { text-align: center; font-size: var(--text-sm); color: var(--color-text-3); margin: var(--space-4) 0; }
.auth-footer { margin-top: var(--space-6); text-align: center; font-size: var(--text-sm); color: var(--color-text-2); }
.auth-footer a { color: var(--color-accent); font-weight: 500; }
.auth-footer a:hover { text-decoration: underline; }
.auth-alert { padding: var(--space-3) var(--space-4); border-radius: var(--radius); font-size: var(--text-sm); margin-bottom: var(--space-4); }
.auth-alert-error { background: var(--color-danger-light); color: var(--color-danger); }
.auth-alert-success { background: var(--color-success-light); color: #166534; }

/* ============================================================
   App Shell (Projects + Canvas)
   ============================================================ */
.app-shell { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-width); flex-shrink: 0; display: flex; flex-direction: column;
  background: var(--color-surface); border-right: 1px solid var(--color-border);
  overflow: hidden;
}
.sidebar-header {
  height: var(--topbar-height); display: flex; align-items: center;
  padding: 0 var(--space-4); border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}
.sidebar-logo { font-size: var(--text-md); font-weight: 700; letter-spacing: -0.02em; flex: 1; }
.sidebar-body { flex: 1; overflow-y: auto; padding: var(--space-3); }
.sidebar-footer { padding: var(--space-3); border-top: 1px solid var(--color-border); }

/* Sidebar Nav */
.sidebar-section { margin-bottom: var(--space-4); }
.sidebar-section-title { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-3); text-transform: uppercase; letter-spacing: 0.05em; padding: 0 var(--space-2); margin-bottom: var(--space-2); }
.sidebar-item {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-2); border-radius: var(--radius-sm);
  font-size: var(--text-sm); color: var(--color-text-2); cursor: pointer;
  transition: background var(--transition), color var(--transition);
  user-select: none;
}
.sidebar-item:hover { background: var(--color-surface-2); color: var(--color-text); }
.sidebar-item.active { background: var(--color-accent-light); color: var(--color-accent); font-weight: 500; }
.sidebar-item svg { flex-shrink: 0; opacity: 0.7; }
.sidebar-item.active svg { opacity: 1; }

/* ============================================================
   Projects Page
   ============================================================ */
.projects-page { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.projects-topbar {
  height: var(--topbar-height); display: flex; align-items: center;
  padding: 0 var(--space-6); border-bottom: 1px solid var(--color-border);
  gap: var(--space-3); flex-shrink: 0;
}
.projects-title { font-size: var(--text-md); font-weight: 600; flex: 1; }
.projects-body { flex: 1; overflow-y: auto; padding: var(--space-6); }
.projects-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
}
.project-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); overflow: hidden; cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  position: relative;
}
.project-card:hover { border-color: var(--color-border-hover); box-shadow: var(--shadow); }
.project-card-thumb {
  width: 100%; aspect-ratio: 16/9; background: var(--color-surface-2);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.project-card-thumb svg { color: var(--color-border-hover); }
.project-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.project-card-body { padding: var(--space-3) var(--space-4); }
.project-card-name { font-size: var(--text-sm); font-weight: 500; margin-bottom: var(--space-1); }
.project-card-meta { font-size: var(--text-xs); color: var(--color-text-3); }
.project-card-menu { position: absolute; top: var(--space-2); right: var(--space-2); }

/* Folder */
.folder-item {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  cursor: pointer; user-select: none;
  transition: background var(--transition);
}
.folder-item:hover { background: var(--color-surface-2); }
.folder-item.active { background: var(--color-accent-light); }
.folder-name { font-size: var(--text-sm); flex: 1; }

/* ============================================================
   Canvas Shell
   ============================================================ */
.canvas-shell { flex: 1; display: flex; flex-direction: column; overflow: hidden; position: relative; }

/* Canvas Topbar */
.canvas-topbar {
  height: var(--topbar-height); display: flex; align-items: center;
  padding: 0 var(--space-4); border-bottom: 1px solid var(--color-border);
  background: var(--color-surface); gap: var(--space-3); flex-shrink: 0; z-index: 10;
}
.canvas-topbar-title {
  font-size: var(--text-sm); font-weight: 500; flex: 1;
  cursor: text; padding: var(--space-1) var(--space-2); border-radius: var(--radius-sm);
  border: 1px solid transparent; outline: none;
  transition: border-color var(--transition);
}
.canvas-topbar-title:hover { border-color: var(--color-border); }
.canvas-topbar-title:focus { border-color: var(--color-accent); }

/* Save status */
.save-status { display: flex; align-items: center; gap: var(--space-1); font-size: var(--text-xs); color: var(--color-text-3); }
.save-status-dot { width: 6px; height: 6px; border-radius: var(--radius-full); background: var(--color-success); }
.save-status-dot.saving { background: var(--color-warning); animation: pulse 1s infinite; }
.save-status-dot.unsaved { background: var(--color-warning); }
.save-status-dot.error { background: var(--color-danger); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

/* Canvas Viewport */
.canvas-viewport {
  flex: 1; overflow: hidden; position: relative;
  background-color: var(--canvas-bg);
  background-image: radial-gradient(circle, var(--dot-color) var(--dot-size), transparent var(--dot-size));
  background-size: var(--dot-gap) var(--dot-gap);
  cursor: default;
}
.canvas-viewport.panning { cursor: grabbing; }
.canvas-world {
  position: absolute; top: 0; left: 0;
  transform-origin: 0 0;
  will-change: transform;
}

/* Canvas Controls */
.canvas-controls {
  position: absolute; bottom: var(--space-4); left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: var(--space-1);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-1); box-shadow: var(--shadow);
  z-index: 10;
}
.canvas-zoom-label { font-size: var(--text-xs); color: var(--color-text-2); padding: 0 var(--space-2); min-width: 44px; text-align: center; }

/* SVG Edge layer */
.canvas-edges {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none; overflow: visible;
}
.canvas-edges.interactive { pointer-events: all; }

/* ============================================================
   Nodes
   ============================================================ */
.node {
  position: absolute; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  user-select: none; transition: box-shadow var(--transition);
  cursor: pointer;
}
.node:focus { outline: none; }

/* Seed node */
.node-seed {
  background: var(--node-seed-bg); color: var(--node-seed-text);
  border: 2px solid var(--node-seed-border);
  min-width: 140px; min-height: 56px; padding: var(--space-3) var(--space-4);
  font-weight: 600; font-size: var(--text-md); letter-spacing: -0.01em;
  box-shadow: var(--shadow-md);
}

/* AI Candidate node */
.node-candidate {
  background: var(--node-candidate-bg); color: var(--node-candidate-text);
  border: 1.5px dashed var(--node-candidate-border);
  min-width: 100px; min-height: 44px; padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm); font-weight: 500;
  box-shadow: var(--shadow-sm); opacity: 0.9;
  transition: all var(--transition);
}
.node-candidate:hover { opacity: 1; border-color: var(--color-accent); transform: translateY(-1px); box-shadow: var(--shadow); }

/* Selected / Manual node */
.node-selected, .node-manual {
  background: var(--node-selected-bg); color: var(--color-text);
  border: 1.5px solid var(--node-selected-border);
  min-width: 120px; min-height: 48px; padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm); font-weight: 500;
  box-shadow: var(--node-selected-shadow);
}

/* Connect node */
.node-connect {
  background: var(--node-connect-bg); color: var(--node-connect-text);
  border: 1.5px solid var(--node-connect-border);
  min-width: 160px; min-height: 60px; padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm); line-height: 1.5;
  box-shadow: var(--shadow-sm); border-radius: var(--radius-lg);
}

/* Image / Video node */
.node-image, .node-video {
  background: var(--color-surface); border: 1.5px solid var(--color-border);
  min-width: 200px; min-height: 150px; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow);
  flex-direction: column; align-items: stretch;
}
.node-media-content { flex: 1; overflow: hidden; position: relative; }
.node-media-content img, .node-media-content video { width: 100%; height: 100%; object-fit: cover; }
.node-media-loading {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: var(--space-2);
  background: var(--color-surface-2); color: var(--color-text-3); font-size: var(--text-sm);
}
.node-media-footer { padding: var(--space-2) var(--space-3); font-size: var(--text-xs); color: var(--color-text-3); border-top: 1px solid var(--color-border); }

/* Selected state */
.node.selected { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* Node action buttons */
.node-actions {
  position: absolute; top: -32px; left: 50%; transform: translateX(-50%);
  display: none; align-items: center; gap: var(--space-1);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: var(--space-1); box-shadow: var(--shadow);
  white-space: nowrap; z-index: 20;
}
.node.selected .node-actions { display: flex; }

/* Expand/Collapse toggle */
.node-toggle {
  position: absolute; top: -10px; right: -10px;
  width: 20px; height: 20px; border-radius: var(--radius-full);
  background: var(--color-accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; cursor: pointer;
  box-shadow: var(--shadow-sm); z-index: 5;
  transition: background var(--transition), transform var(--transition);
}
.node-toggle:hover { background: var(--color-accent-hover); transform: scale(1.1); }

/* Connection points */
.conn-point {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 10px; height: 10px; border-radius: var(--radius-full);
  background: var(--color-surface); border: 2px solid var(--color-accent);
  cursor: crosshair; opacity: 0; transition: opacity var(--transition);
  z-index: 10;
}
.node:hover .conn-point, .node.selected .conn-point { opacity: 1; }
.conn-point.left { left: -6px; }
.conn-point.right { right: -6px; }
.conn-point:hover { background: var(--color-accent); transform: translateY(-50%) scale(1.2); }

/* Node editing */
.node-edit-input {
  width: 100%; background: transparent; border: none; outline: none;
  font: inherit; color: inherit; text-align: center; resize: none;
  min-width: 80px;
}

/* ============================================================
   Edge (SVG)
   ============================================================ */
.edge-branch { stroke: var(--edge-branch); stroke-width: 1.5; fill: none; stroke-linecap: round; }
.edge-connect { stroke: var(--edge-connect); stroke-width: 2; fill: none; stroke-dasharray: 6 3; stroke-linecap: round; }
.edge-drawing { stroke: var(--color-accent); stroke-width: 1.5; fill: none; stroke-dasharray: 4 2; stroke-linecap: round; }

/* ============================================================
   Right Toolbar
   ============================================================ */
.right-toolbar {
  position: absolute; right: var(--space-4); top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; gap: var(--space-2);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-2); box-shadow: var(--shadow-md);
  z-index: 10;
}
.toolbar-tool {
  width: 44px; height: 44px; border-radius: var(--radius);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  cursor: grab; color: var(--color-text-2); font-size: 10px; font-weight: 500;
  transition: background var(--transition), color var(--transition);
  user-select: none;
}
.toolbar-tool:hover { background: var(--color-surface-2); color: var(--color-text); }
.toolbar-tool.dragging { cursor: grabbing; background: var(--color-accent-light); color: var(--color-accent); }
.toolbar-divider { height: 1px; background: var(--color-border); margin: var(--space-1) 0; }

/* Drag ghost */
.drag-ghost {
  position: fixed; pointer-events: none; z-index: 9999;
  background: var(--color-surface); border: 1.5px dashed var(--color-accent);
  border-radius: var(--radius); padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm); color: var(--color-accent); box-shadow: var(--shadow-md);
  transform: rotate(2deg);
}

/* ============================================================
   Selection Box
   ============================================================ */
.selection-box {
  position: absolute; border: 1.5px solid var(--color-accent);
  background: rgba(37,99,235,0.05); pointer-events: none; z-index: 5;
  border-radius: var(--radius-sm);
}

/* ============================================================
   Modal / Dialog
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.3);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: var(--space-4);
  backdrop-filter: blur(2px);
}
.modal {
  background: var(--color-surface); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg); width: 100%; max-width: 480px;
  border: 1px solid var(--color-border); overflow: hidden;
}
.modal-header { padding: var(--space-5) var(--space-6) var(--space-4); border-bottom: 1px solid var(--color-border); }
.modal-title { font-size: var(--text-md); font-weight: 600; }
.modal-body { padding: var(--space-5) var(--space-6); }
.modal-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--color-border); display: flex; justify-content: flex-end; gap: var(--space-2); }

/* Prompt confirm modal */
.prompt-preview {
  background: var(--color-surface-2); border-radius: var(--radius);
  padding: var(--space-3); font-size: var(--text-sm); line-height: 1.6;
  color: var(--color-text-2); margin-bottom: var(--space-4); min-height: 80px;
  border: 1px solid var(--color-border);
}
.prompt-edit { width: 100%; }

/* ============================================================
   Credits Badge
   ============================================================ */
.credits-badge {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  font-size: var(--text-xs); font-weight: 500; cursor: pointer;
  transition: background var(--transition);
}
.credits-badge:hover { background: var(--color-border); }
.credits-badge-value { font-weight: 600; }
.credits-badge-low { border-color: var(--color-warning); background: var(--color-warning-light); color: #92400e; }

/* ============================================================
   Admin Layout
   ============================================================ */
.admin-shell { display: flex; height: 100vh; overflow: hidden; }
.admin-sidebar {
  width: 200px; flex-shrink: 0; background: #111; color: #fff;
  display: flex; flex-direction: column; padding: var(--space-4);
}
.admin-logo { font-size: var(--text-md); font-weight: 700; margin-bottom: var(--space-6); opacity: 0.9; }
.admin-logo span { opacity: 0.5; font-weight: 400; }
.admin-nav { flex: 1; display: flex; flex-direction: column; gap: var(--space-1); }
.admin-nav-item {
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  font-size: var(--text-sm); color: rgba(255,255,255,0.6); cursor: pointer;
  transition: background var(--transition), color var(--transition);
  display: flex; align-items: center; gap: var(--space-2);
}
.admin-nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
.admin-nav-item.active { background: rgba(255,255,255,0.12); color: #fff; font-weight: 500; }
.admin-main { flex: 1; overflow-y: auto; background: var(--color-bg); }
.admin-page { padding: var(--space-6); max-width: 1200px; }
.admin-page-title { font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--space-6); letter-spacing: -0.02em; }

/* Stats grid */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--space-4); margin-bottom: var(--space-6); }
.stat-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-5); }
.stat-label { font-size: var(--text-xs); color: var(--color-text-3); font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-2); }
.stat-value { font-size: var(--text-2xl); font-weight: 700; letter-spacing: -0.02em; }
.stat-sub { font-size: var(--text-xs); color: var(--color-text-3); margin-top: var(--space-1); }

/* Table */
.table-wrap { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; }
.table { width: 100%; border-collapse: collapse; }
.table th { padding: var(--space-3) var(--space-4); text-align: left; font-size: var(--text-xs); font-weight: 600; color: var(--color-text-3); text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid var(--color-border); background: var(--color-surface-2); }
.table td { padding: var(--space-3) var(--space-4); font-size: var(--text-sm); border-bottom: 1px solid var(--color-border); }
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: var(--color-surface-2); }

/* Badge */
.badge { display: inline-flex; align-items: center; padding: 2px var(--space-2); border-radius: var(--radius-full); font-size: 11px; font-weight: 500; }
.badge-green { background: var(--color-success-light); color: #166534; }
.badge-red { background: var(--color-danger-light); color: #991b1b; }
.badge-yellow { background: var(--color-warning-light); color: #92400e; }
.badge-blue { background: var(--color-accent-light); color: #1e40af; }
.badge-gray { background: var(--color-surface-2); color: var(--color-text-2); }

/* Pagination */
.pagination { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-4); border-top: 1px solid var(--color-border); justify-content: center; }
.pagination-info { font-size: var(--text-sm); color: var(--color-text-3); }

/* ============================================================
   Loading Spinner
   ============================================================ */
.spinner {
  width: 18px; height: 18px; border: 2px solid var(--color-border);
  border-top-color: var(--color-accent); border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite; display: inline-block;
}
.spinner-sm { width: 14px; height: 14px; border-width: 1.5px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Toast notifications
   ============================================================ */
.toast-container { position: fixed; bottom: var(--space-6); left: 50%; transform: translateX(-50%); z-index: 2000; display: flex; flex-direction: column; gap: var(--space-2); pointer-events: none; }
.toast {
  background: #111; color: #fff; padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg); font-size: var(--text-sm); box-shadow: var(--shadow-lg);
  pointer-events: all; animation: toast-in 0.2s ease; max-width: 320px; text-align: center;
}
.toast-success { background: #166534; }
.toast-error { background: var(--color-danger); }
.toast-warning { background: #92400e; }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ============================================================
   Context Menu
   ============================================================ */
.context-menu {
  position: fixed; z-index: 500; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: var(--space-1); min-width: 160px;
}
.context-item {
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  font-size: var(--text-sm); cursor: pointer; display: flex; align-items: center; gap: var(--space-2);
  transition: background var(--transition);
}
.context-item:hover { background: var(--color-surface-2); }
.context-item.danger { color: var(--color-danger); }
.context-item.danger:hover { background: var(--color-danger-light); }
.context-sep { height: 1px; background: var(--color-border); margin: var(--space-1) 0; }

/* ============================================================
   Dropdown
   ============================================================ */
.dropdown { position: relative; display: inline-flex; }
.dropdown-menu {
  position: absolute; top: calc(100% + 4px); right: 0; z-index: 100;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); min-width: 160px; padding: var(--space-1);
}
.dropdown-item { padding: var(--space-2) var(--space-3); font-size: var(--text-sm); cursor: pointer; border-radius: var(--radius-sm); display: flex; align-items: center; gap: var(--space-2); transition: background var(--transition); }
.dropdown-item:hover { background: var(--color-surface-2); }
.dropdown-item.danger { color: var(--color-danger); }
.dropdown-item.danger:hover { background: var(--color-danger-light); }

/* ============================================================
   Animations
   ============================================================ */
.fade-in { animation: fadeIn 0.15s ease; }
.scale-in { animation: scaleIn 0.15s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

/* Candidate nodes expand animation */
@keyframes nodeExpand { from { opacity: 0; transform: scale(0.6); } to { opacity: 1; transform: scale(1); } }
.node-candidate.entering { animation: nodeExpand 0.2s ease forwards; }
@keyframes nodeCollapse { from { opacity: 1; transform: scale(1); } to { opacity: 0; transform: scale(0.6); } }
.node-candidate.leaving { animation: nodeCollapse 0.15s ease forwards; }

/* ============================================================
   Responsive (canvas is desktop-only)
   ============================================================ */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .auth-card { padding: var(--space-6); }
}

/* ============================================================
   Canvas Engine — Node Anchors
   ============================================================ */
.node-anchor {
  position: absolute; top: 50%; width: 10px; height: 10px;
  background: var(--color-accent); border: 2px solid white;
  border-radius: 50%; transform: translateY(-50%);
  opacity: 0; transition: opacity 0.15s; cursor: crosshair; z-index: 10;
}
.canvas-node:hover .node-anchor { opacity: 1; }
.node-anchor-left  { left:  -6px; }
.node-anchor-right { right: -6px; }
.connecting .node-anchor { opacity: 1 !important; cursor: crosshair; }

/* ============================================================
   Canvas Engine — SVG Edges
   ============================================================ */
.canvas-edge-svg { pointer-events: none; }
.canvas-edge-svg path, .canvas-edge-svg line { pointer-events: stroke; }

path.edge, line.edge {
  fill: none; stroke: var(--color-border-hover); stroke-width: 1.5;
  stroke-linecap: round; cursor: pointer;
  transition: stroke 0.15s;
}
path.edge:hover { stroke: var(--color-accent); stroke-width: 2; }
path.edge-expand { stroke: #93c5fd; }
path.edge-connect { stroke: var(--color-warning); stroke-width: 2; stroke-dasharray: 4 3; }
line.edge-connecting {
  stroke: var(--color-accent); stroke-width: 1.5; stroke-dasharray: 6 4;
  pointer-events: none;
}

/* ============================================================
   Canvas Engine — Node Variants
   ============================================================ */
.canvas-world {
  position: absolute; top: 0; left: 0;
  transform-origin: 0 0; will-change: transform;
}

.canvas-node {
  position: absolute; user-select: none;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  cursor: default;
  transition: box-shadow 0.12s, border-color 0.12s;
  min-width: 120px;
}
.canvas-node:hover { box-shadow: var(--shadow-md); border-color: var(--color-border-hover); }
.canvas-node.selected { border-color: var(--color-accent); box-shadow: var(--node-selected-shadow); }

.canvas-node.node-seed {
  background: var(--node-seed-bg); color: var(--node-seed-text);
  border-color: var(--node-seed-border);
  font-weight: 600;
}
.canvas-node.node-candidate {
  background: var(--node-candidate-bg);
  border-color: var(--node-candidate-border);
  color: var(--node-candidate-text);
  animation: nodeExpand 0.2s ease;
}
.canvas-node.node-connect {
  background: var(--node-connect-bg);
  border-color: var(--node-connect-border);
  border-style: dashed;
}
.canvas-node.node-image,
.canvas-node.node-video {
  background: var(--color-surface-2);
  border-style: solid;
  overflow: hidden;
}

.node-body {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3); min-height: 44px;
}
.node-body-manual { align-items: flex-start; padding: var(--space-2); }
.node-body-connect { gap: var(--space-2); font-size: var(--text-sm); }
.node-body-media { padding: 0; justify-content: center; align-items: center; }

.node-label {
  flex: 1; font-size: var(--text-sm); line-height: 1.35;
  word-break: break-word; cursor: text;
}
.node-seed .node-label { color: white; }

.node-connect-badge {
  flex-shrink: 0; color: var(--color-warning);
  display: flex; align-items: center;
}

.node-textarea {
  width: 100%; border: none; outline: none; background: transparent;
  resize: none; font-size: var(--text-sm); line-height: 1.4;
  font-family: inherit; color: var(--color-text);
  padding: var(--space-1); min-height: 60px;
}

.node-inline-input {
  flex: 1; border: none; border-bottom: 1px solid var(--color-accent);
  outline: none; background: transparent; font-size: var(--text-sm);
  font-family: inherit; color: var(--color-text); padding: 0;
}

.node-image { width: 100%; height: 140px; object-fit: cover; display: block; }
.node-video { width: 100%; height: 140px; object-fit: cover; display: block; }
.node-media-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-2); padding: var(--space-4);
  color: var(--color-text-3); font-size: var(--text-xs); text-align: center;
  width: 100%; min-height: 120px;
}

.node-actions {
  display: flex; gap: 2px; align-items: center;
  margin-left: auto; flex-shrink: 0;
  opacity: 0; transition: opacity 0.12s;
}
.canvas-node:hover .node-actions { opacity: 1; }

.node-btn {
  display: flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border: none; background: transparent;
  border-radius: var(--radius-sm); cursor: pointer;
  color: var(--color-text-3); transition: all var(--transition);
}
.node-btn:hover { background: var(--color-surface-2); color: var(--color-text); }
.node-btn-select { color: var(--color-accent); }
.node-btn-select:hover { background: var(--color-accent-light); }
.node-seed .node-btn { color: rgba(255,255,255,0.6); }
.node-seed .node-btn:hover { background: rgba(255,255,255,0.15); color: white; }

/* ============================================================
   Canvas Engine — Selection Box
   ============================================================ */
.selection-box {
  position: absolute; pointer-events: none; z-index: 999;
  border: 1.5px dashed var(--color-accent);
  background: rgba(37,99,235,0.05);
  border-radius: 2px;
}

/* ============================================================
   Canvas Engine — Save Indicator
   ============================================================ */
.save-indicator {
  display: flex; align-items: center; gap: 4px;
  font-size: var(--text-xs); padding: 4px 8px;
  border-radius: var(--radius-sm); white-space: nowrap;
}
.save-indicator-saved  { color: var(--color-text-3); }
.save-indicator-saving { color: var(--color-text-3); }
.save-indicator-error  { color: var(--color-danger); }

/* ============================================================
   Canvas Engine — Controls
   ============================================================ */
.canvas-controls {
  position: absolute; bottom: var(--space-4); left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 2px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  padding: var(--space-1); z-index: 50;
}

/* ============================================================
   Canvas — Right Toolbar
   ============================================================ */
.right-toolbar {
  position: absolute; right: var(--space-4); top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-2);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-md);
  padding: var(--space-3) var(--space-2); z-index: 50;
}
.toolbar-tool {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: var(--space-2); border-radius: var(--radius-md); cursor: grab;
  color: var(--color-text-2); font-size: 10px; font-weight: 500;
  transition: all var(--transition); user-select: none; width: 52px;
}
.toolbar-tool:hover { background: var(--color-accent-light); color: var(--color-accent); }
.toolbar-tool:active { cursor: grabbing; }
.toolbar-divider { width: 28px; height: 1px; background: var(--color-border); margin: 2px 0; }

/* ============================================================
   Context Menu — unified
   ============================================================ */
.context-menu-item {
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  font-size: var(--text-sm); cursor: pointer;
  transition: background var(--transition);
}
.context-menu-item:hover { background: var(--color-surface-2); }
.context-menu-item-danger { color: var(--color-danger); }
.context-menu-item-danger:hover { background: var(--color-danger-light); }
.context-menu-separator { height: 1px; background: var(--color-border); margin: var(--space-1) 0; }

/* ============================================================
   Spinner sizes
   ============================================================ */
.spinner-xs {
  display: inline-block; width: 10px; height: 10px;
  border: 1.5px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* ============================================================
   Admin — Enhanced Layout
   ============================================================ */
.admin-layout {
  display: flex; height: 100vh; overflow: hidden;
  background: var(--color-bg);
}
.admin-sidebar {
  width: 220px; flex-shrink: 0; background: #18181b;
  color: #e4e4e7; display: flex; flex-direction: column;
  border-right: 1px solid #27272a; overflow-y: auto;
}
.admin-sidebar-logo {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-4); font-weight: 700; font-size: var(--text-sm);
  border-bottom: 1px solid #27272a; color: white;
}
.admin-nav { padding: var(--space-2); flex: 1; }
.admin-nav-footer { padding: var(--space-2); border-top: 1px solid #27272a; }
.admin-nav-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
  font-size: var(--text-sm); color: #a1a1aa; text-decoration: none;
  transition: all var(--transition); cursor: pointer;
}
.admin-nav-item:hover { background: #27272a; color: white; }
.admin-nav-item.active { background: var(--color-accent); color: white; }

.admin-main {
  flex: 1; overflow-y: auto; padding: var(--space-6); background: var(--color-bg);
}
.admin-page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--space-6);
}
.admin-page-title { font-size: var(--text-xl); font-weight: 700; color: var(--color-text); }
.admin-toolbar {
  display: flex; gap: var(--space-2); align-items: center; margin-bottom: var(--space-4);
}

.admin-section-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); margin-top: var(--space-6);
}
.admin-chart-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); padding: var(--space-4);
}
.admin-section-title { font-weight: 600; font-size: var(--text-sm); margin-bottom: var(--space-3); color: var(--color-text-2); }

.admin-info-text { font-size: var(--text-sm); color: var(--color-text-2); margin-bottom: var(--space-4); }
.admin-empty { text-align: center; color: var(--color-text-3); padding: var(--space-8); }
.admin-error { display: flex; align-items: center; gap: var(--space-2); color: var(--color-danger); padding: var(--space-4); }
.admin-loading { display: flex; justify-content: center; padding: var(--space-8); }

/* Stats Grid */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.stat-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); padding: var(--space-4);
  display: flex; align-items: center; gap: var(--space-3);
}
.stat-card-icon { flex-shrink: 0; }
.stat-card-value { font-size: var(--text-xl); font-weight: 700; color: var(--color-text); line-height: 1.2; }
.stat-card-label { font-size: var(--text-xs); color: var(--color-text-3); margin-top: 2px; }

/* Admin Table */
.table-wrapper { overflow-x: auto; border-radius: var(--radius-xl); border: 1px solid var(--color-border); }
.admin-table { width: 100%; border-collapse: collapse; background: var(--color-surface); }
.admin-table th {
  padding: var(--space-3) var(--space-4); text-align: left;
  font-size: var(--text-xs); font-weight: 600; color: var(--color-text-2);
  text-transform: uppercase; letter-spacing: 0.05em;
  background: var(--color-surface-2); border-bottom: 1px solid var(--color-border);
}
.admin-table td {
  padding: var(--space-3) var(--space-4); font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--color-surface-2); }
.admin-table-sm td, .admin-table-sm th { padding: var(--space-2) var(--space-3); }

/* Badge enhancements */
.badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 100px; font-size: 11px; font-weight: 600; }
.badge-success { background: var(--color-success-light); color: #166534; }
.badge-warning { background: var(--color-warning-light); color: #92400e; }
.badge-danger  { background: var(--color-danger-light);  color: #991b1b; }
.badge-info    { background: var(--color-accent-light);   color: var(--color-accent); }
.badge-muted   { background: var(--color-surface-2);      color: var(--color-text-3); }

/* Btn group */
.btn-group { display: flex; gap: 4px; }
.btn-xs { padding: 2px 8px; font-size: 11px; height: auto; }
.btn-success { background: var(--color-success); color: white; }
.btn-success:hover { background: #16a34a; }

/* Pagination */
.pagination { display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-4); justify-content: center; }
.pagination-info { font-size: var(--text-sm); color: var(--color-text-3); }

/* Text utils */
.text-mono { font-family: ui-monospace, monospace; }
.text-xs    { font-size: var(--text-xs); }
.text-sm    { font-size: var(--text-sm); }
.text-error { color: var(--color-danger); }
.text-muted { color: var(--color-text-3); }
.text-center { text-align: center; }
.mb-2 { margin-bottom: var(--space-2); }