body {
  font-family: Arial, sans-serif;
  max-width: 700px;
  margin: 0 auto;
  padding: 20px;
  transition: background-color 0.3s, color 0.3s;
}

body.dark {
  background: #181c1f;
  color: #f0f0f0;
}

body.light-mode {
  background: #f0f0f0;
  color: #222;
}

.container {
  margin-top: 60px;
}

h1 {
  text-align: center;
  margin-bottom: 24px;
  color: #c62828;
  font-size: 2.2em;
}

body.dark h1 {
  color: #ef5350;
}

.section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body.dark .section {
  background: #23272a;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

h2 {
  margin-top: 0;
  margin-bottom: 12px;
  color: #c62828;
  font-size: 1.2em;
}

body.dark h2 {
  color: #ef5350;
}

.template-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.template-option {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.input-group {
  margin-bottom: 14px;
}

.input-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: #333;
}

body.dark .input-group label {
  color: #e0e0e0;
}

.input-group input {
  width: 100%;
  padding: 10px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 1em;
  background: #fff;
  color: #222;
}

body.dark .input-group input {
  background: #2c2f33;
  border-color: #444;
  color: #f0f0f0;
}

.preset-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.preset-btn {
  padding: 10px 16px;
  background: #fff;
  border: 2px solid #d4af37;
  color: #b8860b;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.preset-btn:hover {
  background: #fff8e1;
  color: #5d4037;
}

body.dark .preset-btn {
  background: #2c2f33;
  border-color: #b8860b;
  color: #f4e4a6;
}

body.dark .preset-btn:hover {
  background: #3d4045;
  color: #fff;
}

.preview {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
  margin-bottom: 16px;
}

.couplet-paper {
  background: #c62828;
  border: 3px solid #d4af37;
  border-radius: 8px;
  padding: 24px 32px;
  position: relative;
  min-width: 260px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: "Microsoft JhengHei", "PingFang TC", "Noto Sans TC", sans-serif;
}

.couplet-paper .horizontal {
  font-size: 1.8em;
  font-weight: bold;
  letter-spacing: 0.2em;
  margin-bottom: 20px;
}

.couplet-paper .vertical {
  font-size: 1.2em;
  font-weight: bold;
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 0.1em;
  margin: 4px 0;
}

.couplet-paper .vertical.top {
  align-self: flex-start;
}

.couplet-paper .vertical.bottom {
  align-self: flex-end;
}

.couplet-paper .single {
  font-size: 6em;
  font-weight: bold;
  line-height: 1;
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.action-btn {
  padding: 12px 24px;
  border: 2px solid #1976d2;
  background: transparent;
  color: #1976d2;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.action-btn.primary {
  background: #c62828;
  border-color: #c62828;
  color: #fff;
}

.action-btn.primary:hover {
  background: #b71c1c;
  border-color: #b71c1c;
}

.action-btn:hover {
  background: rgba(25, 118, 210, 0.1);
}

body.dark .action-btn {
  border-color: #90caf9;
  color: #90caf9;
}

body.dark .action-btn.primary {
  background: #c62828;
  border-color: #c62828;
  color: #fff;
}

.hidden {
  display: none;
}

@media print {
  body * {
    visibility: hidden;
  }
  .preview,
  .preview * {
    visibility: visible;
  }
  .preview {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    min-height: auto;
  }
}