/* ============================================
   拼豆图纸生成器 - 现代精美样式
   ============================================ */

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --secondary: #f472b6;
  --accent: #fbbf24;
  --success: #34d399;
  --danger: #f87171;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 10px 40px rgba(0,0,0,0.1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 16px;
  --radius-sm: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f472b6 100%);
  min-height: 100vh;
  color: var(--text);
  line-height: 1.6;
}

/* 背景装饰 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* 主容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 30px 20px;
  position: relative;
  z-index: 1;
}

/* 头部 */
.header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  padding: 16px 32px;
  border-radius: 50px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.logo h1 {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: rgba(255,255,255,0.9);
  font-size: 16px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

/* 主布局 */
.main-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* 卡片 */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.card-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.card-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.card-body {
  padding: 24px;
}

/* 上传区域 */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: linear-gradient(135deg, rgba(99,102,241,0.02), rgba(244,114,182,0.02));
}

.upload-area:hover {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(244,114,182,0.05));
  transform: translateY(-2px);
}

.upload-area.dragover {
  border-color: var(--primary);
  background: rgba(99,102,241,0.1);
  transform: scale(1.02);
}

.upload-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.6;
}

.upload-text {
  color: var(--text-muted);
  margin-bottom: 8px;
}

.upload-hint {
  font-size: 13px;
  color: var(--text-muted);
  opacity: 0.7;
}

#fileInput {
  display: none;
}

/* 图片预览 */
.preview-container {
  margin-top: 20px;
  display: none;
}

.preview-container.show {
  display: block;
}

.preview-wrapper {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #f1f5f9;
}

#originalPreview {
  width: 100%;
  display: block;
}

.preview-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  color: white;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
}

/* 设置区域 */
.settings-section {
  margin-bottom: 24px;
}

.settings-section:last-child {
  margin-bottom: 0;
}

.settings-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-title::before {
  content: '';
  width: 4px;
  height: 16px;
  background: linear-gradient(to bottom, var(--primary), var(--secondary));
  border-radius: 2px;
}

/* 输入组 */
.input-group {
  margin-bottom: 16px;
}

.input-group label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.input-row {
  display: flex;
  gap: 12px;
}

.input-row input[type="number"] {
  flex: 1;
}

input[type="number"] {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: all 0.2s;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 14px rgba(99,102,241,0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99,102,241,0.5);
}

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

.btn-secondary {
  background: var(--card);
  color: var(--text);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: rgba(99,102,241,0.05);
}

.btn-success {
  background: linear-gradient(135deg, var(--success), #10b981);
  color: white;
  box-shadow: 0 4px 14px rgba(52,211,153,0.4);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(52,211,153,0.5);
}

.btn-full {
  width: 100%;
}

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

.btn-group .btn {
  flex: 1;
  min-width: 120px;
}

/* 结果区域 */
.result-card {
  min-height: 500px;
  display: flex;
  flex-direction: column;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.4;
}

.empty-state h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.empty-state p {
  max-width: 300px;
  font-size: 14px;
}

/* 图纸预览 */
.result-content {
  display: none;
}

.result-content.show {
  display: block;
}

.result-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
}

.tab-btn {
  flex: 1;
  padding: 14px 20px;
  border: none;
  background: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

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

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
}

.tab-content {
  display: none;
  padding: 24px;
}

.tab-content.active {
  display: block;
}

/* 图纸画布 */
#patternCanvas {
  max-width: 100%;
  display: block;
  margin: 0 auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* 颜色清单 */
.color-list {
  max-height: 400px;
  overflow-y: auto;
}

.color-item {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.color-item:hover {
  background: rgba(99,102,241,0.05);
}

.color-swatch {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  margin-right: 14px;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
}

.color-info {
  flex: 1;
}

.color-code {
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
}

.color-count {
  font-size: 13px;
  color: var(--text-muted);
}

.color-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 6px;
  overflow: hidden;
}

.color-bar-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* 统计信息 */
.stats-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
  padding: 16px;
  background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(244,114,182,0.05));
  border-radius: var(--radius-sm);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 进度条 */
.progress-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.progress-overlay.show {
  display: flex;
}

.progress-card {
  background: var(--card);
  padding: 32px 48px;
  border-radius: var(--radius);
  text-align: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.progress-text {
  font-size: 14px;
  color: var(--text-muted);
}

/* 页脚 */
.footer {
  text-align: center;
  padding: 40px 20px;
  color: rgba(255,255,255,0.7);
  font-size: 13px;
}

.footer a {
  color: white;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.3);
  transition: border-color 0.2s;
}

.footer a:hover {
  border-bottom-color: white;
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text);
}

/* 动画 */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

/* ========== 新增：颜色预设按钮 ========== */
.preset-btn {
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  border: 2px solid var(--border);
  background: var(--card);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99,102,241,0.05);
}

.preset-btn:active {
  transform: scale(0.95);
}

/* ========== 新增：滑块样式 ========== */
input[type="range"] {
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(99,102,241,0.3);
  transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  cursor: pointer;
  border: none;
}

/* ========== 启用状态 ========== */
#maxColorGroup.enabled {
  opacity: 1;
  pointer-events: auto;
}

/* ========== 品牌选择器 ========== */
.brand-selector {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

.brand-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 12px;
  border: 2px solid var(--border);
  background: var(--card);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.brand-btn:hover {
  border-color: var(--primary-light);
  background: rgba(99,102,241,0.03);
}

.brand-btn.active {
  border-color: var(--primary);
  background: rgba(99,102,241,0.08);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.brand-btn.active .brand-name {
  color: var(--primary);
}

.brand-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.brand-info {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

/* ========== 系列选择网格 ========== */
.series-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.series-checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 12px;
}

.series-checkbox:hover {
  background: rgba(99,102,241,0.05);
  border-color: var(--primary-light);
}

.series-checkbox input[type="checkbox"] {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.series-checkbox .series-color {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid rgba(0,0,0,0.1);
}

.series-checkbox .series-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}

.series-checkbox .series-count {
  font-size: 10px;
  color: var(--text-muted);
  flex-shrink: 0;
}