:root {
  --red: #c8191e;
  --dark-red: #8f0e13;
  --gold: #d6a94f;
  --ink: #2b2118;
  --muted: #796b5c;
  --paper: #fffaf0;
  --panel: rgba(255, 255, 255, 0.9);
  --shadow: 0 24px 80px rgba(71, 22, 15, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 221, 148, 0.35), transparent 30rem),
    linear-gradient(135deg, #fff6e3 0%, #fff 42%, #fbe9dd 100%);
}

.site-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding: 40px clamp(20px, 5vw, 72px) 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--dark-red);
  font-weight: 700;
  letter-spacing: 0.22em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  color: var(--dark-red);
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1;
}

h2 {
  margin-bottom: 18px;
  color: var(--dark-red);
  font-size: 22px;
}

.subtitle {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 16px;
}

.notice {
  flex-shrink: 0;
  padding: 10px 16px;
  color: var(--dark-red);
  border: 1px solid rgba(200, 25, 30, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 24px;
  padding: 0 clamp(20px, 5vw, 72px) 36px;
}

.panel {
  border: 1px solid rgba(214, 169, 79, 0.24);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.form-panel {
  padding: 26px;
}

form {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: #5d4c3f;
  font-size: 14px;
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid rgba(93, 76, 63, 0.18);
  border-radius: 14px;
  padding: 12px 13px;
  color: var(--ink);
  background: #fffdfa;
  font: inherit;
  font-weight: 500;
  outline: none;
  transition:
    border 0.2s ease,
    box-shadow 0.2s ease;
}

input:focus {
  border-color: rgba(200, 25, 30, 0.5);
  box-shadow: 0 0 0 4px rgba(200, 25, 30, 0.08);
}

input[readonly] {
  background: #f8efe4;
}

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

.inline-control {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

button {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  color: var(--dark-red);
  background: #f7e3c1;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    background 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(143, 14, 19, 0.13);
}

.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--red), var(--dark-red));
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  line-height: 1.45;
}

.checkbox input {
  width: 18px;
  height: 18px;
  accent-color: var(--red);
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 6px;
}

.actions .primary {
  grid-column: 1 / -1;
}

.preview-panel {
  min-width: 0;
  padding: 22px;
}

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

.preview-toolbar h2 {
  margin-bottom: 0;
}

#previewHint {
  color: var(--muted);
  font-size: 13px;
}

.certificate-wrap {
  overflow: auto;
  border-radius: 22px;
  background:
    linear-gradient(45deg, rgba(214, 169, 79, 0.12) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(214, 169, 79, 0.12) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(214, 169, 79, 0.12) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(214, 169, 79, 0.12) 75%);
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-size: 20px 20px;
}

canvas {
  display: block;
  width: 100%;
  min-width: 680px;
  height: auto;
  border-radius: 18px;
  background: var(--paper);
}

.site-footer {
  padding: 0 clamp(20px, 5vw, 72px) 34px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: start;
    flex-direction: column;
  }

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

@media print {
  body {
    background: #fff;
  }

  .site-header,
  .form-panel,
  .preview-toolbar,
  .site-footer {
    display: none;
  }

  .layout,
  .preview-panel {
    display: block;
    padding: 0;
    border: 0;
    box-shadow: none;
  }

  .certificate-wrap {
    overflow: visible;
    background: none;
  }

  canvas {
    width: 100vw;
    min-width: 0;
    border-radius: 0;
  }
}