:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --line: #dde1e8;
  --text: #171a21;
  --muted: #6e7480;
  --accent: #111318;
  --blue: #2962ff;
}

* { box-sizing: border-box; }

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

button,
input,
select { font: inherit; }

.builder-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px clamp(18px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

.builder-header h1 { display: inline; margin: 0 0 0 16px; font-size: 22px; }
.builder-header p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.builder-header a { color: var(--text); text-decoration: none; font-size: 13px; }
.docs-link { padding: 8px 13px; border: 1px solid var(--line); border-radius: 8px; }

.builder-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 420px);
  gap: 18px;
  max-width: 1500px;
  margin: 0 auto;
  padding: 18px;
}

.workbench,
.settings {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  box-shadow: 0 8px 26px rgba(20, 28, 45, 0.06);
}

.workbench { overflow: hidden; }

.preview-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.preview-heading strong { font-size: 14px; }
.preview-heading span { margin-left: 8px; color: var(--muted); font-size: 12px; }
.preview-heading button,
.settings-actions button,
.copy-button {
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  cursor: pointer;
}

.preview-stage {
  display: grid;
  min-height: 520px;
  padding: 16px;
  place-items: start center;
  overflow: auto;
  background:
    linear-gradient(45deg, #eef0f4 25%, transparent 25%),
    linear-gradient(-45deg, #eef0f4 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #eef0f4 75%),
    linear-gradient(-45deg, transparent 75%, #eef0f4 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
}

#widget-preview {
  display: block;
  max-width: 100%;
  border: 0;
  border-radius: 10px;
  background: #070b14;
  box-shadow: 0 10px 34px rgba(9, 13, 23, 0.18);
}

.code-panel { border-top: 1px solid var(--line); }
.code-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}

.code-tabs button {
  padding: 7px 14px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.code-tabs button.active { background: #eef0f4; color: var(--text); }
.code-tabs .copy-button { margin-left: auto; border: 1px solid var(--line); color: var(--text); }

.code-panel pre {
  min-height: 250px;
  max-height: 420px;
  margin: 0;
  padding: 18px;
  overflow: auto;
  background: #10141e;
  color: #d7deeb;
  font: 12px/1.65 Consolas, "SFMono-Regular", monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.integration-note { margin: 0; padding: 10px 16px; color: var(--muted); font-size: 12px; }

.settings {
  position: sticky;
  top: 18px;
  align-self: start;
  max-height: calc(100vh - 36px);
  overflow: auto;
}

.settings-title { padding: 14px 16px; border-bottom: 1px solid var(--line); font-weight: 700; }
.settings details { border-bottom: 1px solid var(--line); }
.settings summary {
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  user-select: none;
}

.settings details[open] summary { border-bottom: 1px solid #edf0f4; }
.field {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 7px 16px;
  color: #343943;
  font-size: 13px;
}

.field:last-child { padding-bottom: 16px; }
.field select,
.size-grid input {
  width: 100%;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  background: #fff;
  color: var(--text);
}

.field select:focus,
.size-grid input:focus { border-color: var(--blue); box-shadow: 0 0 0 2px rgba(41, 98, 255, 0.12); }

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 16px;
  font-size: 13px;
}

.switch-row input {
  width: 38px;
  height: 20px;
  accent-color: var(--blue);
  cursor: pointer;
}

.size-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 4px 16px 16px;
}

.size-grid label { color: var(--muted); font-size: 11px; }
.size-grid input { display: block; margin-top: 5px; }
.size-grid input:disabled { background: #f0f1f3; color: #a0a5ae; }

.settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px;
}

.settings-actions #apply-config { border-color: var(--accent); background: var(--accent); color: #fff; }
.builder-message { min-height: 28px; padding: 0 16px 12px; color: #16803c; font-size: 12px; text-align: right; }

@media (max-width: 980px) {
  .builder-layout { grid-template-columns: 1fr; }
  .settings { position: static; max-height: none; grid-row: 1; }
  .preview-stage { min-height: 400px; }
}

@media (max-width: 560px) {
  .builder-header { padding: 14px; }
  .builder-header h1 { display: block; margin: 8px 0 0; }
  .builder-header p,
  .docs-link { display: none; }
  .builder-layout { padding: 8px; }
  .preview-stage { min-height: 340px; padding: 8px; }
  .field { grid-template-columns: 95px minmax(0, 1fr); }
}