:root {
  --iwb-bg: #f4f7fb;
  --iwb-card: #ffffff;
  --iwb-text: #0f172a;
  --iwb-muted: #64748b;
  --iwb-line: #dbe4f0;
  --iwb-primary: #2563eb;
  --iwb-primary-dark: #1d4ed8;
  --iwb-accent: #7c3aed;
  --iwb-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.iwb-app, .iwb-app * { box-sizing: border-box; }
.iwb-app {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--iwb-text);
}
.iwb-shell {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 850px;
  background: var(--iwb-bg);
  border: 1px solid var(--iwb-line);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--iwb-shadow);
}
.iwb-sidebar {
  background: linear-gradient(180deg, #f8fbff 0%, #eef4ff 100%);
  border-right: 1px solid var(--iwb-line);
  padding: 20px;
  overflow-y: auto;
}
.iwb-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}
.iwb-brand-logo {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--iwb-primary), var(--iwb-accent));
  color: #fff;
  font-size: 22px;
  box-shadow: 0 10px 18px rgba(37, 99, 235, 0.18);
}
.iwb-brand strong { display: block; font-size: 17px; }
.iwb-brand span { color: var(--iwb-muted); font-size: 12px; display: block; margin-top: 4px; }
.iwb-section {
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(219,228,240,0.9);
  border-radius: 18px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 8px 22px rgba(148, 163, 184, 0.08);
}
.iwb-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.iwb-section h3 { margin: 0; font-size: 15px; }
.iwb-workspace {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.iwb-toolbar, .iwb-subtoolbar {
  padding: 14px 18px;
  border-bottom: 1px solid var(--iwb-line);
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  background: rgba(255,255,255,0.96);
}
.iwb-subtoolbar {
  justify-content: space-between;
  gap: 20px;
}
.iwb-palette-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--iwb-muted);
  font-size: 12px;
}
.iwb-tool-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.iwb-tool, .iwb-btn, .iwb-mini-btn {
  border: 1px solid var(--iwb-line);
  background: #fff;
  color: var(--iwb-text);
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  font-size: 13px;
  line-height: 1.1;
}
.iwb-tool:hover, .iwb-btn:hover, .iwb-mini-btn:hover {
  transform: translateY(-1px);
  border-color: #b6c4d6;
}
.iwb-tool.is-active, .iwb-btn-primary {
  background: linear-gradient(135deg, var(--iwb-primary), var(--iwb-accent));
  color: #fff;
  border-color: transparent;
}
.iwb-btn-primary:hover { background: linear-gradient(135deg, var(--iwb-primary-dark), var(--iwb-accent)); }
.iwb-full { width: 100%; justify-content: center; display: flex; }
.iwb-label {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--iwb-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.iwb-input, .iwb-admin-wrap input.regular-text, .iwb-admin-wrap select {
  width: 100%;
  border: 1px solid var(--iwb-line);
  background: #fff;
  border-radius: 12px;
  min-height: 44px;
  padding: 0 14px;
  box-shadow: inset 0 1px 2px rgba(15,23,42,0.04);
}
.iwb-status {
  min-height: 20px;
  margin-top: 8px;
  color: var(--iwb-muted);
  font-size: 12px;
}
.iwb-board-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 260px;
  overflow-y: auto;
}
.iwb-board-item {
  background: #fff;
  border: 1px solid var(--iwb-line);
  border-radius: 14px;
  padding: 12px;
  display: grid;
  gap: 8px;
}
.iwb-board-item h4 {
  margin: 0;
  font-size: 14px;
}
.iwb-board-item small { color: var(--iwb-muted); }
.iwb-board-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.iwb-board-actions button {
  padding: 8px 10px;
  font-size: 12px;
}
.iwb-sticker-store {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: 340px;
  overflow-y: auto;
  padding-right: 4px;
}
.iwb-sticker-category-title {
  font-size: 12px;
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--iwb-muted);
}
.iwb-sticker-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.iwb-sticker-tile {
  border: 1px solid var(--iwb-line);
  background: #fff;
  border-radius: 14px;
  padding: 10px;
  cursor: grab;
  text-align: center;
  min-height: 86px;
}
.iwb-sticker-tile:hover { border-color: #93c5fd; transform: translateY(-1px); }
.iwb-sticker-tile img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  margin-bottom: 6px;
}
.iwb-sticker-tile span {
  display: block;
  font-size: 11px;
  line-height: 1.3;
}
.iwb-stage-wrap {
  position: relative;
  flex: 1;
  min-height: 600px;
  background-image: radial-gradient(circle at 1px 1px, rgba(148,163,184,0.28) 1px, transparent 0);
  background-size: 24px 24px;
  overflow: hidden;
}
.iwb-stage {
  position: absolute;
  inset: 0;
}
#iwb-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
}
.canvas-container {
  position: absolute !important;
  inset: 0 !important;
}
.iwb-video-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.iwb-video-widget {
  position: absolute;
  border: 2px solid rgba(37,99,235,0.35);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 22px rgba(15,23,42,0.12);
  background: #0f172a;
  pointer-events: auto;
}
.iwb-video-widget iframe, .iwb-video-widget video {
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
}
.iwb-video-toolbar {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 3;
  display: flex;
  gap: 6px;
}
.iwb-video-toolbar button {
  border: 0;
  background: rgba(255,255,255,0.92);
  border-radius: 999px;
  width: 28px;
  height: 28px;
  cursor: pointer;
}
.iwb-video-resize {
  position: absolute;
  width: 18px;
  height: 18px;
  right: 6px;
  bottom: 6px;
  background: #fff;
  border-radius: 50%;
  cursor: nwse-resize;
  box-shadow: 0 2px 8px rgba(15,23,42,0.2);
}
.iwb-auth-card {
  max-width: 560px;
  margin: 40px auto;
  padding: 36px;
  border-radius: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #eef4ff 100%);
  border: 1px solid var(--iwb-line);
  box-shadow: var(--iwb-shadow);
  text-align: center;
}
.iwb-auth-icon {
  font-size: 40px;
  margin-bottom: 10px;
}
.iwb-auth-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}
.iwb-color-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.iwb-color-chip {
  width: 28px;
  height: 28px;
  border: 2px solid #fff;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(148,163,184,0.5);
  cursor: pointer;
}
.iwb-file-btn input { display: none; }
.iwb-admin-wrap .iwb-admin-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin: 20px 0;
}
.iwb-admin-card {
  background: #fff;
  border: 1px solid #dbe4f0;
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 8px 20px rgba(15,23,42,0.04);
  margin-bottom: 20px;
}
.iwb-empty-state {
  color: var(--iwb-muted);
  text-align: center;
  padding: 14px;
  border: 1px dashed var(--iwb-line);
  border-radius: 14px;
}
@media (max-width: 1100px) {
  .iwb-shell { grid-template-columns: 1fr; }
  .iwb-sidebar { border-right: 0; border-bottom: 1px solid var(--iwb-line); }
}
@media (max-width: 782px) {
  .iwb-admin-wrap .iwb-admin-grid { grid-template-columns: 1fr; }
  .iwb-toolbar, .iwb-subtoolbar { padding: 12px; }
}