:root {
  color-scheme: light;
  --paper: #f7f8f6;
  --paper-deep: #eef1ed;
  --ink: #1d1d1b;
  --muted: rgba(29, 29, 27, 0.56);
  --line: rgba(29, 29, 27, 0.14);
  --panel: rgba(255, 255, 255, 0.78);
  --pink: #da167a;
  --yellow: #fbb823;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--paper);
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
}

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

.builder {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr) 250px;
  grid-template-rows: 100%;
  transition: grid-template-columns 0.18s ease;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(239, 242, 238, 0.92)),
    var(--paper);
}

.builder::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(29, 29, 27, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 29, 27, 0.035) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, transparent, black 12%, black 88%, transparent);
}

#motion-engine {
  position: relative;
  z-index: 1;
  grid-column: 1 / -1;
  grid-row: 1;
  display: block;
  width: 100%;
  height: 100%;
  cursor: default;
  touch-action: none;
}

.panel {
  position: relative;
  z-index: 2;
  display: flex;
  min-width: 0;
  min-height: 0;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  border-color: var(--line);
  background: var(--panel);
  backdrop-filter: blur(18px);
  overflow: hidden;
  transition:
    opacity 0.16s ease,
    padding 0.16s ease,
    border-color 0.16s ease;
}

.panel-left {
  grid-column: 1;
  grid-row: 1;
  border-right: 1px solid var(--line);
}

.panel-right {
  grid-column: 3;
  grid-row: 1;
  border-left: 1px solid var(--line);
}

.builder.is-left-collapsed {
  grid-template-columns: 0 minmax(0, 1fr) 250px;
}

.builder.is-right-collapsed {
  grid-template-columns: 190px minmax(0, 1fr) 0;
}

.builder.is-left-collapsed.is-right-collapsed {
  grid-template-columns: 0 minmax(0, 1fr) 0;
}

.builder.is-left-collapsed .panel-left,
.builder.is-right-collapsed .panel-right {
  padding-right: 0;
  padding-left: 0;
  border-color: transparent;
  opacity: 0;
  pointer-events: none;
}

.panel-toggle {
  position: fixed;
  top: 50%;
  z-index: 6;
  display: grid;
  width: 30px;
  height: 48px;
  place-items: center;
  border: 1px solid rgba(29, 29, 27, 0.14);
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
  transform: translateY(-50%);
  transition:
    left 0.18s ease,
    right 0.18s ease,
    background 0.16s ease,
    border-color 0.16s ease;
}

.panel-toggle:hover {
  border-color: rgba(218, 22, 122, 0.36);
  background: rgba(255, 255, 255, 0.94);
}

.panel-toggle-left {
  left: 190px;
  border-left: 0;
}

.panel-toggle-right {
  right: 250px;
  border-right: 0;
}

.builder.is-left-collapsed .panel-toggle-left {
  left: 0;
}

.builder.is-right-collapsed .panel-toggle-right {
  right: 0;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid rgba(29, 29, 27, 0.16);
  color: var(--ink);
  font-size: 23px;
  font-weight: 700;
}

.mode-row,
.panel-actions,
.json-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.panel-actions {
  grid-template-columns: 1fr;
  margin-top: auto;
}

.control,
.tool-button,
.icon-button {
  min-height: 32px;
  border: 1px solid rgba(29, 29, 27, 0.16);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  cursor: pointer;
}

.control:hover,
.tool-button:hover,
.icon-button:hover {
  border-color: rgba(29, 29, 27, 0.28);
  background: rgba(255, 255, 255, 0.92);
}

.control.is-active,
.tool-button.is-active {
  border-color: rgba(218, 22, 122, 0.42);
  background: rgba(218, 22, 122, 0.09);
}

.palette {
  display: grid;
  gap: 8px;
  overflow: auto;
  padding-right: 2px;
}

.tool-button {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  padding: 8px;
  text-align: left;
}

.tool-icon {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  color: var(--pink);
  font-size: 16px;
  font-weight: 700;
}

.tool-label {
  overflow: hidden;
  font-size: 13px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 36px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  font-weight: 700;
}

.icon-button {
  width: 28px;
  min-height: 28px;
  font-size: 18px;
  line-height: 1;
}

.inspector {
  display: grid;
  gap: 10px;
  overflow: auto;
  padding-right: 2px;
}

.field {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
}

.field label {
  color: var(--muted);
  font-size: 12px;
}

.field input,
.field select {
  width: 100%;
  min-width: 0;
  height: 30px;
  border: 1px solid rgba(29, 29, 27, 0.16);
  background: rgba(255, 255, 255, 0.74);
  color: var(--ink);
  padding: 0 8px;
}

.field-group-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding-top: 6px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}

.level-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 28px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

.level-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.level-list {
  display: grid;
  gap: 2px;
  overflow: auto;
  padding-right: 2px;
}

.level-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 2px;
  padding: 5px 6px;
  font-size: 12px;
  border: 1px solid transparent;
}

.level-item:hover {
  background: rgba(255, 255, 255, 0.5);
  border-color: var(--line);
}

.level-item.is-active {
  border-color: rgba(218, 22, 122, 0.3);
  background: rgba(218, 22, 122, 0.06);
}

.level-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: default;
}

.level-name-input {
  width: 100%;
  min-width: 0;
  height: 22px;
  border: 1px solid rgba(218, 22, 122, 0.4);
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font-size: 12px;
  padding: 0 4px;
  outline: none;
}

.level-btn {
  all: unset;
  cursor: pointer;
  width: 20px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
  line-height: 1;
}

.level-btn:hover {
  color: var(--pink);
}

.level-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.builder.is-preview {
  grid-template-columns: 1fr;
}

.builder.is-preview #motion-engine {
  grid-column: 1 / -1;
  grid-row: 1;
  width: 100vw;
  height: 100vh;
}

.builder.is-preview .panel-left,
.builder.is-preview .panel-right {
  display: none;
}

.builder.is-preview .panel-toggle {
  display: none;
}

.builder.is-preview::before {
  display: none;
}

.preview-exit {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 10;
  min-height: 32px;
  padding: 0 14px;
  border: 1px solid rgba(29, 29, 27, 0.16);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  opacity: 0.35;
  transition: opacity 0.2s;
}

.preview-exit:hover {
  opacity: 1;
  border-color: rgba(29, 29, 27, 0.28);
  background: rgba(255, 255, 255, 0.92);
}

@media (max-width: 820px) {
  .builder {
    grid-template-columns: 74px minmax(0, 1fr);
  }

  .builder.is-right-collapsed {
    grid-template-columns: 74px minmax(0, 1fr);
  }

  .builder.is-left-collapsed,
  .builder.is-left-collapsed.is-right-collapsed {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  .panel-left {
    padding: 10px;
  }

  .panel-right {
    position: fixed;
    right: 10px;
    bottom: 10px;
    left: 84px;
    max-height: 240px;
    border: 1px solid var(--line);
  }

  .mode-row,
  .panel-actions {
    grid-template-columns: 1fr;
  }

  .tool-button {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .tool-label {
    display: none;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .panel-toggle-left {
    left: 74px;
  }

  .builder.is-left-collapsed .panel-toggle-left {
    left: 0;
  }

  .panel-toggle-right {
    display: none;
  }
}