* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --success-color: #10b981;
  --success-hover: #059669;
  --danger-color: #ef4444;
  --secondary-color: #6b7280;
  --bg-color: #f9fafb;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */

header {
  text-align: center;
  padding: 40px 20px;
  background: linear-gradient(135deg, var(--primary-color), #7c3aed);
  color: white;
  border-radius: 16px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-lg);
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.95;
}

/* Main sections */

main {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

section {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  /* 移除overflow限制，让内容可以自然展开 */
  overflow: visible;
}

section h2 {
  margin-bottom: 20px;
  color: var(--text-primary);
  font-size: 1.5rem;
}

/* Drop Zone */

.drop-zone {
  border: 3px dashed var(--border-color);
  border-radius: 12px;
  padding: 60px 20px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--primary-color);
  background: rgba(79, 70, 229, 0.05);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.upload-icon {
  width: 64px;
  height: 64px;
  color: var(--primary-color);
  stroke-width: 2;
}

.drop-zone h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
}

.drop-zone p {
  color: var(--text-secondary);
}

/* File List */

.file-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all 0.2s ease;
  cursor: move;
}

.file-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--primary-color);
}

.file-item.dragging {
  opacity: 0.5;
}

.file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.file-icon {
  font-size: 24px;
}

.file-details {
  display: flex;
  flex-direction: column;
}

.file-name {
  font-weight: 500;
  color: var(--text-primary);
}

.file-size {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.file-actions {
  display: flex;
  gap: 8px;
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  transition: background 0.2s ease;
  font-size: 1.2rem;
}

.btn-icon:hover {
  background: var(--bg-color);
}

/* Layout Options */

.layout-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
  padding: 20px;
  background: var(--bg-color);
  border-radius: 8px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-label {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.radio-group {
  display: flex;
  gap: 10px;
}

.radio-option {
  cursor: pointer;
  flex: 1;
}

.radio-option input[type="radio"] {
  display: none;
}

.radio-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 15px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  transition: all 0.3s ease;
  background: white;
}

.radio-option input[type="radio"]:checked + .radio-card {
  border-color: var(--primary-color);
  background: rgba(79, 70, 229, 0.05);
}

.radio-card:hover {
  border-color: var(--primary-color);
}

.orientation-icon {
  width: 32px;
  height: 32px;
  stroke-width: 2;
}

.number-input {
  padding: 10px 12px;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
  background: white;
}

.number-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.select-input {
  padding: 10px 12px;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
  background: white;
  cursor: pointer;
  width: 100%;
}

.select-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.select-input:hover {
  border-color: var(--primary-color);
}

.layout-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 15px;
  margin-bottom: 30px;
}

.preset-btn {
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.preset-btn:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.preset-btn.active {
  border-color: var(--success-color);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
  background: rgba(16, 185, 129, 0.08);
}

.preset-btn.active:hover {
  border-color: var(--success-color);
}

.preset-btn:active {
  transform: translateY(0);
}

.preset-preview {
  width: 100%;
  padding: 10px;
  background: var(--bg-color);
  border-radius: 4px;
}

.preset-btn span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.layout-option {
  cursor: pointer;
}

.layout-option input[type="radio"] {
  display: none;
}

.option-card {
  padding: 20px;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  text-align: center;
  transition: all 0.3s ease;
  background: white;
}

.layout-option input[type="radio"]:checked + .option-card {
  border-color: var(--primary-color);
  background: rgba(79, 70, 229, 0.05);
}

.option-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.layout-preview {
  display: grid;
  gap: 8px;
  margin-bottom: 15px;
  min-height: 80px;
  align-items: center;
}

.layout-2 {
  grid-template-columns: 1fr 1fr;
}

.layout-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.layout-4 {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.preview-box {
  aspect-ratio: 1;
  background: var(--border-color);
  border-radius: 4px;
}

.option-card span {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
}

/* Buttons */

.action-buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  justify-content: center;
}

/* Settings Modal */

.settings-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.settings-modal.open {
  display: flex;
}

.settings-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.48);
  backdrop-filter: blur(2px);
}

.settings-dialog {
  position: relative;
  width: min(980px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  background: var(--card-bg);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  padding: 24px;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.settings-header h2 {
  margin: 0;
}

.settings-close-btn {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: auto;
  padding: 6px 12px;
  line-height: 1;
}

.settings-close-btn:hover {
  color: var(--text-primary);
  border-color: var(--primary-color);
  background: rgba(79, 70, 229, 0.08);
}

.settings-subtitle {
  margin: 6px 0 18px;
  color: var(--text-primary);
  font-size: 1.2rem;
}

button {
  font-family: inherit;
  font-size: 1rem;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-success {
  background: var(--success-color);
  color: white;
}

.btn-success:hover {
  background: var(--success-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background: #4b5563;
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.1rem;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Progress */

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 15px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--success-color));
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  text-align: center;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Preview */

.preview-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  /* 移除固定高度限制，让内容自然展开 */
  max-height: none;
  overflow-y: visible;
  padding: 10px;
}

.preview-page {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  background: white;
  padding: 10px;
  /* 居中显示 */
  margin: 0 auto;
}

.preview-page-title {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  text-align: center;
}

.preview-page canvas {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

/* 移除滚动相关的样式 */
/*
.preview-container::-webkit-scrollbar {
    width: 8px;
}

.preview-container::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

.preview-container::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.preview-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}
*/

/* 移除滚动提示样式 */
/*
.preview-container:hover {
    border-left: 3px solid var(--primary-color) !important;
    border-right: 3px solid var(--primary-color) !important;
}

.scrollable-preview {
    border-left: 3px solid var(--primary-color);
    border-right: 3px solid var(--primary-color);
}
*/

/* Footer */

footer {
  margin-top: 60px;
  padding: 40px 20px;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.feature {
  display: flex;
  gap: 15px;
  align-items: flex-start;
}

.feature-icon {
  font-size: 2rem;
  line-height: 1;
}

.feature h4 {
  margin-bottom: 5px;
  color: var(--text-primary);
}

.feature p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Responsive */

@media (max-width: 768px) {
  header h1 {
    font-size: 1.8rem;
  }
  .subtitle {
    font-size: 1rem;
  }
  section {
    padding: 20px;
  }
  .layout-options {
    grid-template-columns: 1fr;
  }
  .action-buttons {
    flex-direction: column;
  }
  button {
    width: 100%;
  }

  .settings-dialog {
    width: calc(100vw - 20px);
    max-height: calc(100vh - 20px);
    padding: 16px;
  }

  .settings-close-btn {
    width: auto;
  }
}