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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #f0eeea;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#topbar {
  background: #fff;
  border-bottom: 1px solid #ddd;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

#topbar h1 {
  font-size: 15px;
  font-weight: 600;
  color: #333;
  margin-right: auto;
}

#topbar button {
  font-size: 13px;
  padding: 5px 14px;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  color: #333;
}

#topbar button:hover { background: #f5f5f5; }

#topbar select {
  font-size: 13px;
  padding: 5px 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  color: #333;
  max-width: 180px;
}

#undo-group {
  display: flex;
  align-items: center;
  gap: 4px;
  border-right: 1px solid #e0e0e0;
  padding-right: 12px;
}

#undo-hint {
  font-size: 11px;
  color: #bbb;
  white-space: nowrap;
  padding-left: 4px;
}

#topbar button.primary {
  background: #3a3a3a;
  color: #fff;
  border-color: #3a3a3a;
}

#topbar button.primary:hover { background: #222; }

#main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* LEFT PANEL - element bank */
#bank {
  width: 180px;
  flex-shrink: 0;
  background: #fff;
  border-right: 1px solid #ddd;
  padding: 12px 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#bank h2 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #999;
  margin-bottom: 4px;
  margin-top: 8px;
}

#bank h2:first-child { margin-top: 0; }

#bank h3 {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #bbb;
  margin-top: 6px;
  margin-bottom: 3px;
  padding-left: 2px;
}

.bank-hint {
  font-size: 11px;
  color: #aaa;
  font-style: italic;
  line-height: 1.4;
  margin-top: -2px;
  margin-bottom: 2px;
}

.bank-pattern {
  background: #f0f4ff;
  border-color: #b0c4ee;
  color: #336;
}

.bank-pattern:hover {
  border-color: #6688cc;
  background: #e4ecff;
}

.bank-item {
  padding: 7px 10px;
  border: 1.5px dashed #ccc;
  border-radius: 6px;
  font-size: 13px;
  color: #444;
  cursor: grab;
  background: #fafafa;
  user-select: none;
  transition: border-color 0.15s, background 0.15s;
}

.bank-item:hover {
  border-color: #888;
  background: #f0f0f0;
}

.bank-item:active { cursor: grabbing; }

/* CANVAS AREA */
#canvas-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px;
  background: #f0eeea;
}

#canvas-container {
  position: relative;
  background: #fafaf8;
  border: 1px solid #ddd;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

#wireframe-canvas {
  display: block;
  cursor: default;
}

/* RIGHT PANEL - properties */
#props {
  width: 200px;
  flex-shrink: 0;
  background: #fff;
  border-left: 1px solid #ddd;
  padding: 12px 10px;
  overflow-y: auto;
  font-size: 13px;
}

#props h2 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #999;
  margin-bottom: 8px;
}

#props .prop-group {
  margin-bottom: 14px;
}

#props label {
  display: block;
  font-size: 12px;
  color: #666;
  margin-bottom: 4px;
}

#props select, #props input[type="text"] {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 13px;
  background: #fafafa;
}

#props .btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

#props .btn-group button {
  flex: 1;
  min-width: 40px;
  padding: 4px 6px;
  font-size: 12px;
  border: 1px solid #ddd;
  border-radius: 5px;
  background: #fafafa;
  cursor: pointer;
  color: #444;
}

#props .btn-group button.active {
  background: #3a3a3a;
  color: #fff;
  border-color: #3a3a3a;
}

#props .btn-group.preset-cols {
  flex-direction: column;
  gap: 3px;
}

#props .btn-group.preset-cols button {
  flex: none;
  text-align: left;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 11px;
  padding: 5px 8px;
}

#semantic-warnings {
  margin-top: 16px;
  border-top: 1px solid #f0e8d8;
}

.sem-header {
  font-size: 11px;
  font-weight: 600;
  color: #b07020;
  padding: 10px 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sem-warning {
  font-size: 11px;
  color: #8a4a00;
  background: #fff8ee;
  border: 1px solid #f0d8a0;
  border-radius: 4px;
  padding: 5px 7px;
  margin-bottom: 5px;
  line-height: 1.4;
}

#props .prop-hint {
  font-size: 11px;
  color: #aaa;
  font-style: italic;
  margin-top: -8px;
  margin-bottom: 14px;
  line-height: 1.4;
}

#no-selection {
  color: #aaa;
  font-size: 13px;
  font-style: italic;
  margin-top: 8px;
}

/* BOTTOM YAML PANEL */
#yaml-drawer {
  flex-shrink: 0;
  background: #1e1e1e;
  border-top: 1px solid #444;
  transition: height 0.2s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#yaml-handle {
  display: flex;
  align-items: center;
  padding: 6px 14px;
  cursor: pointer;
  user-select: none;
  gap: 8px;
  flex-shrink: 0;
}

#yaml-handle span {
  font-size: 12px;
  color: #aaa;
  font-family: monospace;
}

#yaml-handle .chevron {
  font-size: 11px;
  color: #888;
  transition: transform 0.2s;
}

#yaml-handle .yaml-label {
  font-size: 12px;
  font-weight: 600;
  color: #ccc;
  margin-right: auto;
  font-family: monospace;
}

#yaml-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  padding: 0 12px 12px;
}

#yaml-editor {
  flex: 1;
  background: #1e1e1e;
  color: #d4d4d4;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  border: 1px solid #444;
  border-radius: 6px;
  padding: 10px;
  resize: none;
  outline: none;
  line-height: 1.6;
  overflow-y: auto;
}

#yaml-editor.error { border-color: #e05555; }

#yaml-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  flex-shrink: 0;
}

#yaml-error {
  font-size: 12px;
  color: #e05555;
  font-family: monospace;
  flex: 1;
}

#yaml-update-btn {
  padding: 5px 18px;
  background: #3a8a5a;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  font-weight: 500;
  flex-shrink: 0;
}

#yaml-update-btn:hover { background: #2e7048; }

/* EXPORT MODAL */
#export-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

#export-modal.open { display: flex; }

#export-box {
  background: #1e1e1e;
  border-radius: 10px;
  width: min(860px, 92vw);
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
  overflow: hidden;
}

#export-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid #333;
  gap: 10px;
  flex-shrink: 0;
}

#export-header span {
  font-size: 13px;
  font-weight: 600;
  color: #ccc;
  font-family: monospace;
  margin-right: auto;
}

#export-copy-btn {
  padding: 5px 16px;
  background: #3a8a5a;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  font-weight: 500;
}

#export-copy-btn:hover { background: #2e7048; }
#export-copy-btn.copied { background: #555; }

#export-close-btn {
  padding: 5px 12px;
  background: transparent;
  color: #888;
  border: 1px solid #444;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

#export-close-btn:hover { color: #ccc; border-color: #666; }

#export-options {
  padding: 8px 16px;
  border-bottom: 1px solid #333;
  flex-shrink: 0;
}

#export-options label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: #aaa;
  cursor: pointer;
  user-select: none;
}

#export-options input[type="checkbox"] { cursor: pointer; }

#export-code {
  flex: 1;
  overflow: auto;
  padding: 16px;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 12.5px;
  line-height: 1.6;
  color: #d4d4d4;
  white-space: pre;
  margin: 0;
}

/* DOM TREE PANEL */
#canvas-inner {
  display: flex;
  align-items: flex-start;
}

#dom-tree-panel {
  position: relative;
  width: 150px;
  flex-shrink: 0;
  border-right: 1px solid #ddd;
  margin-right: 16px;
}

.dom-item {
  position: absolute;
  left: 0;
  right: 0;
  height: 22px;
  line-height: 22px;
  font-size: 12px;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  color: #777;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  border-radius: 3px;
  padding-right: 4px;
  user-select: none;
}

.dom-item:hover { background: rgba(0,0,0,0.05); color: #333; }
.dom-selected { background: #dde8ff !important; color: #2244aa !important; font-weight: 600; }

.dom-line {
  position: absolute;
  background: #ccc;
  pointer-events: none;
}

/* Drop highlight on canvas */
#canvas-container.drag-over { outline: 2px dashed #6699cc; }

/* tooltip */
#tooltip {
  position: fixed;
  background: #222;
  color: #fff;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  pointer-events: none;
  display: none;
  z-index: 999;
}

#site-footer {
  background: #fff;
  border-top: 1px solid #ddd;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: #666;
  flex-shrink: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-links a {
  color: #555;
  text-decoration: none;
}

.footer-links a:hover { text-decoration: underline; }

.footer-sep { color: #ccc; }

/* ABOUT MODAL */
#about-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

#about-box {
  background: #fff;
  border-radius: 10px;
  width: min(640px, 92vw);
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 40px rgba(0,0,0,0.25);
  overflow: hidden;
}

#about-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid #eee;
  flex-shrink: 0;
}

#about-header span {
  font-size: 13px;
  font-weight: 600;
  color: #333;
  margin-right: auto;
}

#about-close-btn {
  padding: 5px 12px;
  background: transparent;
  color: #888;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

#about-close-btn:hover { color: #333; border-color: #999; }

#about-content {
  flex: 1;
  overflow: auto;
  padding: 24px 28px;
  font-size: 14px;
  line-height: 1.7;
  color: #333;
}

#about-content h1 { font-size: 20px; margin-bottom: 12px; }
#about-content h2 { font-size: 15px; font-weight: 600; margin: 20px 0 6px; color: #111; }
#about-content h3 { font-size: 13px; font-weight: 600; margin: 14px 0 4px; color: #444; }
#about-content p { margin-bottom: 10px; }
#about-content ul { padding-left: 20px; margin-bottom: 10px; }
#about-content li { margin-bottom: 3px; }
#about-content a { color: #3a7bd5; text-decoration: none; }
#about-content a:hover { text-decoration: underline; }
#about-content strong { font-weight: 600; }