:root {
  --ui-scale: 1;
  --left-sidebar-width: 280px;
  --right-sidebar-width: 330px;
  --ui-bg: #eef2f7;
  --panel-bg: #ffffff;
  --canvas-bg: #ffffff;
  --text: #172033;
  --muted: #62708a;
  --line: #d9e0eb;
  --accent: #2563eb;
  --accent-strong: #1747b9;
  --danger: #dc2626;
  --shadow: 0 14px 36px rgba(23, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--ui-bg);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.designer-shell {
  height: 100vh;
  display: grid;
  grid-template-columns: var(--left-sidebar-width) minmax(0, 1fr) var(--right-sidebar-width);
  grid-template-rows: 1fr;
  font-size: 11px;
  color: var(--text);
  background: var(--ui-bg);
}

.designer-shell[data-theme="dark"] {
  --ui-bg: #101722;
  --panel-bg: #172033;
  --canvas-bg: #ffffff;
  --text: #eef4ff;
  --muted: #9ba8bd;
  --line: #2a3549;
  --accent: #4f8cff;
  --accent-strong: #83aefc;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.28);
}

.toolbar-group {
  flex: 1;
  display: flex;
  align-items: center;
  gap: calc(3px * var(--ui-scale));
  min-width: 0;
  overflow-x: auto;
  padding-bottom: 2px;
}

.history-toolbar {
  flex: 0 0 auto;
}

.menu-header {
  background: rgba(37, 99, 235, 0.04);
}

.menu-section {
  border-bottom: 1px solid var(--line);
}

.menu-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: calc(4px * var(--ui-scale));
}

.menu-actions > * {
  width: 100%;
}

.menu-switch {
  min-height: calc(17px * var(--ui-scale));
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: calc(3px * var(--ui-scale)) calc(5px * var(--ui-scale));
  color: var(--text);
  background: var(--panel-bg);
}

.tool-button,
.secondary-button,
.primary-button,
.danger-button,
.block-button {
  min-height: calc(17px * var(--ui-scale));
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: calc(3px * var(--ui-scale)) calc(5px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
  color: var(--text);
  background: var(--panel-bg);
}

.tool-button:hover,
.secondary-button:hover,
.block-button:hover {
  border-color: var(--accent);
}

.primary-button {
  border-color: var(--accent);
  color: #ffffff;
  background: var(--accent);
}

.primary-button:hover {
  background: var(--accent-strong);
}

.danger-button {
  border-color: #fecaca;
  color: #ffffff;
  background: var(--danger);
}

.danger-button:disabled,
.secondary-button:disabled,
.block-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.secondary-button.active {
  border-color: var(--accent);
  color: #ffffff;
  background: var(--accent);
}

.divider {
  width: calc(1px * var(--ui-scale));
  height: calc(13px * var(--ui-scale));
  flex: 0 0 auto;
  background: var(--line);
}

.select-control {
  height: calc(17px * var(--ui-scale));
  min-width: calc(41px * var(--ui-scale));
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0 calc(4px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
  color: var(--text);
  background: var(--panel-bg);
}

.zoom-select {
  min-width: calc(76px * var(--ui-scale));
}

.color-tool {
  height: calc(17px * var(--ui-scale));
  display: inline-flex;
  align-items: center;
  gap: calc(3px * var(--ui-scale));
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0 calc(4px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
  white-space: nowrap;
}

.color-tool input {
  width: calc(12px * var(--ui-scale));
  height: calc(12px * var(--ui-scale));
  border: 0;
  padding: 0;
  background: transparent;
}

.switch,
.checkbox-row {
  display: inline-flex;
  align-items: center;
  gap: calc(4px * var(--ui-scale));
  color: var(--muted);
  white-space: nowrap;
}

.sidebar {
  min-height: 0;
  overflow-y: auto;
  font-size: calc(11px * var(--ui-scale));
  border-right: 1px solid var(--line);
  background: var(--panel-bg);
}

.right-sidebar {
  border-right: 0;
  border-left: 1px solid var(--line);
}

.sidebar-header {
  padding: calc(9px * var(--ui-scale)) calc(9px * var(--ui-scale)) calc(5px * var(--ui-scale));
  border-bottom: 1px solid var(--line);
}

.sidebar-header h2,
.sidebar-section h3 {
  margin: 0;
  font-size: calc(12px * var(--ui-scale));
}

.sidebar-header p {
  margin: calc(3px * var(--ui-scale)) 0 0;
  color: var(--muted);
  line-height: 1.4;
}

.element-list,
.sidebar-section,
.properties-form {
  padding: calc(7px * var(--ui-scale)) calc(9px * var(--ui-scale));
}

.element-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: calc(4px * var(--ui-scale));
}

.page-meta-section {
  border-top: 1px solid var(--line);
}

.element-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: calc(21px * var(--ui-scale));
  margin-bottom: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: calc(5px * var(--ui-scale)) calc(6px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
  color: var(--text);
  background: var(--panel-bg);
  box-shadow: 0 4px 12px rgba(23, 32, 51, 0.04);
  user-select: none;
  gap: calc(4px * var(--ui-scale));
  overflow: hidden;
}

.element-item:hover {
  border-color: var(--accent);
}

.element-item span {
  min-width: 0;
  color: var(--muted);
  font-size: calc(9px * var(--ui-scale));
  overflow: hidden;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.email-blocks {
  display: none;
  border-top: 1px solid var(--line);
}

.designer-shell.email-mode .email-blocks {
  display: block;
}

.block-button {
  width: 100%;
  margin-top: 4px;
  text-align: left;
}

.workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr);
}

.action-header {
  background: rgba(37, 99, 235, 0.04);
}

.action-section {
  border-bottom: 1px solid var(--line);
}

.property-action-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: calc(4px * var(--ui-scale));
}

.property-action-grid > * {
  width: 100%;
}

.canvas-wrap {
  position: relative;
  min-height: 0;
  height: 100%;
  overflow: hidden;
  touch-action: none;
  cursor: default;
}

.canvas-wrap.is-panning {
  cursor: grabbing;
  user-select: none;
}

.workspace-layer {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  min-width: max-content;
  padding: clamp(16px, 2.4vw, 28px);
  transform: translate(0, 0);
  transform-origin: 0 0;
}

.canvas-wrap.grid-on {
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.1) 1px, transparent 1px);
  background-size: 24px 24px;
}

.canvas {
  width: min(100%, 960px);
  min-height: 720px;
  margin: 0 auto 80px;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid #ccd5e3;
  background: var(--canvas-bg);
  box-shadow: var(--shadow);
  color: #1f2937;
  overflow-wrap: anywhere;
}

.canvas-wrap[data-preview="mobile"] .canvas {
  width: min(100%, 390px);
  min-height: 740px;
  padding: 20px;
}

.canvas-wrap[data-preview="mobile"] .canvas [data-type="columns"] {
  grid-template-columns: 1fr !important;
}

.canvas[data-mode="email"] {
  width: 680px;
  padding: 0;
  background: #f3f4f6;
}

.canvas-wrap[data-preview="mobile"] .canvas[data-mode="email"] {
  width: min(100%, 360px);
}

.editable-block {
  position: relative;
  outline: 0;
  max-width: 100%;
}

.editable-block[draggable="true"] {
  cursor: grab;
}

.editable-block.drag-source {
  opacity: 0.45;
}

.editable-block:hover {
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.35);
}

.editable-block.selected {
  box-shadow: 0 0 0 2px #2563eb;
}

.canvas.selected {
  box-shadow: var(--shadow), 0 0 0 2px #2563eb;
}

.canvas [data-type="container"] {
  min-height: 88px;
  padding: 1px;
  border: 0;
}

.canvas [data-type="columns"] {
  display: grid;
  gap: 16px;
  min-height: 120px;
}

.canvas [data-type="column"] {
  min-height: 96px;
  padding: 16px;
  border: 1px dashed #c8d2e2;
}

.canvas [data-type="image"] {
  display: block;
  max-width: 100%;
  min-height: 80px;
  object-fit: cover;
}

.button-block {
  display: inline-block;
  border-radius: 3px;
  padding: 6px 10px;
  font-size: 11px;
  color: #ffffff;
  background: #2563eb;
  text-decoration: none;
  font-weight: 700;
}

.drop-target {
  box-shadow: inset 0 0 0 2px #22c55e;
}

.drop-before {
  border-top: 4px solid #22c55e !important;
}

.drop-after {
  border-bottom: 4px solid #22c55e !important;
}

.drop-inside {
  box-shadow: inset 0 0 0 2px #22c55e, inset 0 0 0 999px rgba(34, 197, 94, 0.08);
}

.selection-box {
  position: fixed;
  pointer-events: none;
  border: 1px solid #2563eb;
  z-index: 20;
}

.resize-handle {
  position: absolute;
  width: 9px;
  height: 9px;
  border: 1px solid #ffffff;
  background: #2563eb;
  pointer-events: auto;
}

.resize-handle.nw {
  top: -5px;
  left: -5px;
  cursor: nwse-resize;
}

.resize-handle.ne {
  top: -5px;
  right: -5px;
  cursor: nesw-resize;
}

.resize-handle.sw {
  bottom: -5px;
  left: -5px;
  cursor: nesw-resize;
}

.resize-handle.se {
  right: -5px;
  bottom: -5px;
  cursor: nwse-resize;
}

.field {
  margin-bottom: calc(7px * var(--ui-scale));
}

.field label,
.property-grid label {
  display: grid;
  gap: calc(3px * var(--ui-scale));
  color: var(--muted);
  font-size: calc(10px * var(--ui-scale));
}

.field input,
.field textarea,
.property-grid input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: calc(4px * var(--ui-scale)) calc(5px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
  color: var(--text);
  background: var(--panel-bg);
}

.space-input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: calc(4px * var(--ui-scale));
  align-items: center;
}

.space-side-controls {
  display: grid;
  grid-template-columns: repeat(4, calc(30px * var(--ui-scale)));
  justify-content: space-between;
  column-gap: calc(5px * var(--ui-scale));
  row-gap: calc(3px * var(--ui-scale));
}

.space-side-control {
  width: calc(30px * var(--ui-scale));
  display: grid;
  grid-template-columns: calc(7px * var(--ui-scale)) minmax(0, 1fr);
  gap: calc(1px * var(--ui-scale));
  align-items: center;
  color: var(--muted);
  font-size: calc(8px * var(--ui-scale));
  font-weight: 700;
}

.space-side-spin {
  display: grid;
  grid-template-rows: repeat(2, calc(12px * var(--ui-scale)));
  gap: calc(1px * var(--ui-scale));
}

.space-step {
  width: calc(22px * var(--ui-scale));
  height: calc(12px * var(--ui-scale));
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0;
  font-size: calc(6px * var(--ui-scale));
  line-height: 1;
  color: var(--text);
  background: var(--panel-bg);
}

.space-step:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.space-step:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.field textarea {
  resize: vertical;
}

.meta-file-name {
  display: block;
  margin-top: calc(5px * var(--ui-scale));
  overflow: hidden;
  color: var(--muted);
  font-size: calc(10px * var(--ui-scale));
  text-overflow: ellipsis;
  white-space: nowrap;
}

.property-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(6px * var(--ui-scale));
  margin-bottom: calc(7px * var(--ui-scale));
}

.compact-media-tools {
  display: grid;
  gap: calc(5px * var(--ui-scale));
  margin-bottom: calc(7px * var(--ui-scale));
}

.media-tool-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: calc(4px * var(--ui-scale));
}

.media-tool-row > * {
  width: 100%;
}

.media-field input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: calc(4px * var(--ui-scale)) calc(5px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
  color: var(--text);
  background: var(--panel-bg);
}

.media-toggle.active {
  border-color: var(--accent);
  color: #ffffff;
  background: var(--accent);
}

.property-section {
  margin-bottom: calc(7px * var(--ui-scale));
  padding: calc(7px * var(--ui-scale)) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.property-section h3 {
  margin: 0 0 calc(6px * var(--ui-scale));
  font-size: calc(11px * var(--ui-scale));
}

.property-tools {
  display: flex;
  flex-wrap: wrap;
  gap: calc(4px * var(--ui-scale));
  margin-bottom: calc(5px * var(--ui-scale));
}

.property-tools:last-child {
  margin-bottom: 0;
}

.property-tools .select-control {
  flex: 1 1 calc(82px * var(--ui-scale));
  min-width: calc(74px * var(--ui-scale));
}

.property-tools .color-tool {
  flex: 0 0 auto;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  max-width: 320px;
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
  border-radius: 8px;
  padding: 12px 14px;
  color: #ffffff;
  background: #172033;
  box-shadow: var(--shadow);
  transition: opacity 160ms ease, transform 160ms ease;
  z-index: 50;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

@media (max-width: 1200px) {
  .designer-shell {
    --left-sidebar-width: calc(236px * var(--ui-scale));
    --right-sidebar-width: calc(286px * var(--ui-scale));
  }
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }

  .designer-shell {
    height: auto;
    min-height: 100vh;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto auto;
  }

  .toolbar-group {
    flex: 1 1 calc(100% - 136px);
    order: 2;
  }

  .workspace {
    grid-row: 1;
    min-height: 68vh;
  }

  .left-sidebar {
    grid-row: 2;
  }

  .right-sidebar {
    grid-row: 3;
  }

  .sidebar {
    max-height: none;
    border-right: 0;
    border-top: 1px solid var(--line);
  }

  .right-sidebar {
    border-left: 0;
  }

  .element-list,
  .sidebar-section,
  .properties-form {
    padding: 8px 10px;
  }

  .canvas-wrap {
    min-height: 420px;
  }

  .workspace-layer {
    padding: 14px;
  }

  .canvas {
    min-height: 620px;
    margin-bottom: 32px;
    padding: 24px;
  }

  .canvas[data-mode="email"] {
    width: min(100%, 680px);
  }
}

@media (max-width: 520px) {
  .toolbar-group {
    flex-basis: 100%;
  }

  .tool-button,
  .secondary-button,
  .primary-button,
  .danger-button,
  .block-button {
    min-height: 24px;
    padding: 4px 6px;
  }

  .canvas-wrap {
    min-height: 360px;
  }

  .workspace-layer {
    padding: 10px;
  }

  .canvas,
  .canvas-wrap[data-preview="mobile"] .canvas {
    min-height: 560px;
    padding: 16px;
  }

  .canvas [data-type="container"] {
    padding: 1px;
  }

  .canvas [data-type="columns"] {
    gap: 12px;
  }

  .canvas [data-type="column"] {
    padding: 12px;
  }

  .property-grid {
    grid-template-columns: 1fr;
  }
}