:root {
  --primary: #4f7cff;
  --primary-dark: #3a63d4;
  --primary-light: #e8efff;
  --success: #22c55e;
  --success-light: #dcfce7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --bg: #f0f2f5;
  --card: #ffffff;
  --text: #1a1a2e;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 标题 */
.header {
  text-align: center;
  padding: 24px 16px 16px;
}

.header-icon {
  width: 56px;
  height: 56px;
  vertical-align: middle;
  margin-right: 10px;
  border-radius: 12px;
}

.header h1 {
  display: inline-flex;
  align-items: center;
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  vertical-align: middle;
}

/* 卡片 */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}

/* 步骤指示器 */
.steps {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.step {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-light);
  transition: color 0.2s;
}

.step.active {
  color: var(--primary);
  font-weight: 600;
}

.step.done {
  color: var(--success);
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  transition: all 0.2s;
}

.step.active .step-num {
  background: var(--primary);
  color: #fff;
}

.step.done .step-num {
  background: var(--success);
  color: #fff;
}

.step-line {
  width: 24px;
  height: 2px;
  background: var(--border);
}

/* 标签 */
.section-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

/* 选项按钮 */
.option-grid {
  display: grid;
  gap: 12px;
}

.option-grid.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

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

.option-btn {
  padding: 16px 12px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  transition: all 0.2s;
  text-align: center;
}

.option-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.option-btn.selected {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

/* 姓名选择 */
.name-select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--text);
  background: var(--card);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7280' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}

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

/* 输入框 */
.text-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--text);
  background: var(--card);
}

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

.input-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.input-hint {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 6px;
}

/* 上传区域 */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: #fafbfc;
}

.upload-area:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.upload-area.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.upload-area.has-file {
  border-style: solid;
  border-color: var(--success);
  background: var(--success-light);
}

.upload-icon {
  font-size: 32px;
  margin-bottom: 8px;
}

.upload-text {
  font-size: 14px;
  color: var(--text-light);
}

.upload-text strong {
  color: var(--primary);
}

.upload-hint {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 8px;
  padding: 6px 10px;
  background: var(--primary-light);
  border-radius: 8px;
  display: inline-block;
}

/* 文件列表 */
.file-list {
  margin-top: 12px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--success-light);
  border-radius: 8px;
  margin-bottom: 6px;
  font-size: 14px;
}

.file-item .file-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-item .file-size {
  color: var(--text-light);
  font-size: 12px;
  margin: 0 8px;
  flex-shrink: 0;
}

.file-remove {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 18px;
  padding: 0 4px;
  flex-shrink: 0;
}

/* 心理感悟选择 */
.psych-select {
  margin-top: 12px;
  padding: 12px;
  background: var(--warning);
  background: rgba(245, 158, 11, 0.1);
  border-radius: 8px;
}

.psych-select label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}

.psych-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.psych-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 6px;
  transition: background 0.2s;
}

.psych-option:hover {
  background: rgba(245, 158, 11, 0.15);
}

.psych-option input {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* 按钮 */
.btn {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-primary:disabled {
  background: var(--border);
  color: var(--text-light);
  cursor: not-allowed;
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

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

.btn-row .btn {
  flex: 1;
}

/* 成功页面 */
.success-box {
  text-align: center;
  padding: 32px 16px;
}

.success-icon {
  font-size: 56px;
  margin-bottom: 16px;
}

.success-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.success-msg {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 20px;
}

/* 错误提示 */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 12px;
}

.alert-error {
  background: var(--danger-light);
  color: var(--danger);
}

.alert-success {
  background: var(--success-light);
  color: #166534;
}

/* 加载 */
.loading {
  text-align: center;
  padding: 40px;
}

.spinner {
  width: 40px;
  height: 40px;
  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);
  }
}

/* 管理页面 */
.admin-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

.tree-node {
  margin-left: 0;
}

.tree-children {
  margin-left: 20px;
  border-left: 2px solid var(--border);
  padding-left: 12px;
}

.tree-item {
  padding: 8px 12px;
  margin: 4px 0;
  background: var(--card);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.tree-item .item-name {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.tree-item .item-meta {
  font-size: 12px;
  color: var(--text-light);
}

.tree-item.bak {
  background: #fff8e1;
}

.file-checkbox {
  margin-right: 8px;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.badge-bak {
  background: #fff3cd;
  color: #856404;
}

.badge-count {
  background: var(--primary-light);
  color: var(--primary);
}

/* 响应式 */
@media (max-width: 480px) {
  .container {
    padding: 12px;
  }

  .header h1 {
    font-size: 18px;
  }

  .header-icon {
    width: 44px;
    height: 44px;
  }

  .option-grid.cols-2,
  .option-grid.cols-3 {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 16px;
  }

  .btn-row {
    flex-direction: column;
  }

  .step {
    font-size: 11px;
  }

  .step-line {
    width: 12px;
  }
}