:root {
  --bg: #efe6d6;
  --panel: rgba(255, 251, 245, 0.96);
  --line: rgba(125, 87, 26, 0.18);
  --text: #3f2c14;
  --muted: #796550;
  --accent: #dd375f;
  --accent-2: #167dcc;
  --shadow: 0 18px 50px rgba(102, 68, 19, 0.14);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(221, 55, 95, 0.22), transparent 24%),
    radial-gradient(circle at 90% 15%, rgba(22, 125, 204, 0.18), transparent 20%),
    linear-gradient(145deg, #f6eddc 0%, #f0dfb5 100%);
}

.shell {
  width: min(1440px, calc(100% - 32px));
  margin: 16px auto;
  display: grid;
  grid-template-columns: 420px minmax(0, 1fr);
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.controls {
  padding: 24px;
  align-self: start;
  position: sticky;
  top: 16px;
}

.stage {
  min-width: 0;
}

.preview-panel {
  padding: 24px;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.meta {
  max-width: 280px;
  text-align: right;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 700;
}

h1,
h2 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 24px;
}

.intro > p:last-child {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.group {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.group h2 {
  margin-bottom: 14px;
  font-size: 19px;
}

.field,
.field-row {
  margin-bottom: 14px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field span {
  display: block;
  margin-bottom: 7px;
  font-size: 14px;
  font-weight: 600;
}

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

input[type="text"],
input[type="url"],
textarea,
select {
  width: 100%;
  border: 1px solid rgba(121, 101, 80, 0.22);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  padding: 11px 13px;
}

textarea {
  resize: vertical;
  min-height: 84px;
}

input[type="file"] {
  width: 100%;
}

.upload {
  padding: 14px;
  border: 1px dashed rgba(121, 101, 80, 0.28);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.button-row.spread > * {
  flex: 1 1 160px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 11px 16px;
  cursor: pointer;
  font-weight: 700;
  transition: transform 120ms ease, opacity 120ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button.primary {
  background: linear-gradient(135deg, #e93c62, #ff8750);
  color: #fff;
}

button.secondary {
  background: #e7f2fb;
  color: #13548d;
}

button.ghost {
  background: rgba(121, 101, 80, 0.12);
  color: var(--text);
}

.helper,
.status {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.status {
  min-height: 20px;
  color: #9d2645;
}

#previewCanvas {
  display: block;
  width: min(100%, 920px);
  margin: 0 auto;
  background: #f7f0dc;
  border-radius: 26px;
}

@media (max-width: 1100px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .controls {
    position: static;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 20px, 100%);
    margin: 10px auto;
  }

  .controls,
  .preview-panel {
    padding: 18px;
  }

  .field-row {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 26px;
  }
}