* {
  box-sizing: border-box;
}

:root {
  --bg: #f3f0e9;
  --surface: #ffffff;
  --text: #171717;
  --muted: #6d6d68;
  --line: #dfddd6;
  --dark: #101010;
  --accent: #b59a6a;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Arial, Helvetica, sans-serif;
}

.topbar {
  padding: 28px 40px 10px;
}

.brand {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand-subline {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(480px, 1fr);
  gap: 24px;
  padding: 20px 40px 40px;
}

.panel {
  background: var(--surface);
  border-radius: 24px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.form-panel {
  padding: 32px;
}

.preview-panel {
  display: flex;
  flex-direction: column;
}

.panel-head {
  margin-bottom: 30px;
}

.panel-head h1,
.preview-head h2 {
  margin: 5px 0 10px;
}

.panel-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.eyebrow {
  font-size: 11px;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--muted);
}

.section-title {
  margin-top: 28px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}

label {
  display: block;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
}

input,
textarea {
  display: block;
  width: 100%;
  margin-top: 7px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 13px;
  font: inherit;
  font-size: 14px;
  background: #fff;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: #a5a39d;
}

textarea {
  resize: vertical;
}

.grid {
  display: grid;
  gap: 12px;
}

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

.grid.three {
  grid-template-columns: repeat(3, 1fr);
}

.upload-box {
  padding: 15px;
  border: 1px dashed #c7c3ba;
  border-radius: 12px;
  background: #faf9f6;
}

.upload-box input {
  display: none;
}

.upload-box span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-weight: 500;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 28px 30px;
  border-bottom: 1px solid var(--line);
}

.primary-button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: var(--dark);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.primary-button:hover {
  opacity: 0.9;
}

.preview-canvas {
  flex: 1;
  padding: 40px;
  background:
    linear-gradient(45deg, #f8f8f7 25%, transparent 25%),
    linear-gradient(-45deg, #f8f8f7 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f8f8f7 75%),
    linear-gradient(-45deg, transparent 75%, #f8f8f7 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}

#signaturePreview {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  background: #fff;
  padding: 28px;
  border-radius: 10px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.07);
}

.status {
  min-height: 44px;
  padding: 12px 30px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 1050px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .topbar,
  .layout {
    padding-left: 18px;
    padding-right: 18px;
  }

  .grid.two,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .preview-head {
    align-items: flex-start;
    flex-direction: column;
  }
}