:root {
  color-scheme: dark;
  --bg: #08090d;
  --panel: #11141b;
  --panel-2: #151923;
  --line: #252a36;
  --muted: #8f98aa;
  --text: #f5f7fb;
  --soft: rgba(255, 255, 255, 0.72);
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --danger: #fb7185;
  --radius: 8px;
  --font: Inter, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

body {
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

.app-shell {
  display: grid;
  grid-template-rows: 64px minmax(0, 1fr) 72px;
  height: 100vh;
  min-width: 1024px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: #0b0d12;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 300px;
  gap: 12px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background:
    linear-gradient(135deg, rgba(45, 212, 191, 0.95), rgba(96, 165, 250, 0.85)),
    #1f2937;
  box-shadow: 0 0 24px rgba(45, 212, 191, 0.25);
}

.brand h1,
.editor-head h2 {
  margin: 0;
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: 0;
}

.brand p,
.editor-head p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.type-switch,
.layout-tabs,
.button-row,
.export-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.type-switch,
.layout-tabs {
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0f1218;
}

.type-button,
.layout-tab {
  min-height: 34px;
  padding: 0 14px;
  border-radius: 6px;
  color: var(--soft);
  background: transparent;
}

.type-button.is-active,
.layout-tab.is-active {
  color: #041412;
  background: var(--accent);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(280px, 330px) minmax(420px, 1fr) minmax(280px, 350px);
  min-height: 0;
  overflow: hidden;
}

.panel,
.editor-panel {
  min-height: 0;
  border-right: 1px solid var(--line);
  background: var(--panel);
}

.form-panel,
.preview-panel {
  overflow: auto;
  padding: 18px;
}

.field-group {
  margin-bottom: 18px;
}

.field-label,
.control-row label {
  display: block;
  margin-bottom: 8px;
  color: #dce3ef;
  font-size: 13px;
  font-weight: 700;
}

.upload-box {
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 116px;
  padding: 18px;
  border: 1px dashed #3a4254;
  border-radius: var(--radius);
  background: #0c0f15;
  color: var(--muted);
  text-align: center;
  cursor: pointer;
}

.upload-box:hover {
  border-color: var(--accent);
  color: var(--text);
}

.upload-box input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.upload-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #17202c;
  color: var(--accent);
  font-size: 26px;
  line-height: 1;
}

.message {
  min-height: 18px;
  margin: 8px 0 0;
  color: var(--danger);
  font-size: 12px;
}

textarea,
input[type="text"] {
  width: 100%;
  border: 1px solid #303848;
  border-radius: var(--radius);
  background: #0c0f15;
  color: var(--text);
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 82px;
  padding: 11px 12px;
  line-height: 1.45;
}

input[type="text"] {
  height: 42px;
  padding: 0 12px;
}

textarea:focus,
input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.12);
}

.controls {
  padding-top: 4px;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}

.control-row output {
  color: var(--muted);
  font-size: 12px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.primary-button,
.secondary-button {
  min-height: 38px;
  padding: 0 14px;
  border-radius: var(--radius);
  font-weight: 800;
}

.primary-button {
  color: #031816;
  background: var(--accent);
}

.primary-button:hover:not(:disabled) {
  background: #5eead4;
}

.secondary-button {
  color: var(--text);
  background: #1a202b;
  border: 1px solid #303848;
}

.secondary-button:hover:not(:disabled) {
  border-color: #596274;
  background: #202735;
}

.button-row {
  flex-wrap: wrap;
  margin-top: 18px;
}

.editor-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  background: #0b0d12;
}

.editor-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.canvas-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 0;
  overflow: hidden;
  padding: 20px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.025) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.025) 25%, transparent 25%),
    #08090d;
  background-size: 24px 24px;
}

#mainCanvas {
  max-width: 100%;
  max-height: 100%;
  border-radius: var(--radius);
  box-shadow: 0 20px 70px rgba(0, 0, 0, 0.42);
  background: #050505;
}

.empty-state {
  position: absolute;
  display: grid;
  gap: 6px;
  place-items: center;
  width: min(360px, 80%);
  min-height: 130px;
  padding: 24px;
  border: 1px solid #2f3644;
  border-radius: var(--radius);
  background: rgba(10, 12, 18, 0.88);
  color: var(--muted);
  text-align: center;
  pointer-events: none;
}

.empty-state strong {
  color: var(--text);
  font-size: 16px;
}

.empty-state.is-hidden {
  display: none;
}

.preview-panel {
  display: grid;
  gap: 14px;
  align-content: start;
  border-right: 0;
  background: var(--panel-2);
}

.preview-card {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0d1017;
  cursor: pointer;
}

.preview-card.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(45, 212, 191, 0.1);
}

.preview-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
}

.preview-meta strong {
  color: var(--text);
  font-size: 13px;
}

.preview-card canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  background: #050505;
}

.export-bar {
  position: relative;
  z-index: 2;
  justify-content: flex-end;
  padding: 0 24px;
  border-top: 1px solid var(--line);
  background: #0b0d12;
}

@media (max-width: 1180px) {
  body {
    overflow: auto;
  }

  .app-shell {
    min-width: 0;
    height: auto;
    min-height: 100vh;
    grid-template-rows: auto auto auto;
  }

  .topbar,
  .workspace,
  .editor-head,
  .export-bar {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .workspace {
    min-height: 0;
  }

  .panel,
  .editor-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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