/* 基础变量 */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --text-primary: #eaeaea;
  --text-secondary: #a0a0a0;
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --success: #4ecca3;
  --error: #ff6b6b;
  --border: #2a2a4a;
  --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

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

/* 导航栏 */
.navbar {
  background-color: var(--bg-secondary);
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 10px var(--shadow);
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent);
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  gap: 20px;
  list-style: none;
}

.navbar-nav a {
  color: var(--text-primary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  background-color: var(--bg-tertiary);
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: 15px;
}

.navbar-user span {
  color: var(--text-secondary);
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

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

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

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

.btn-sm {
  padding: 6px 12px;
  font-size: 0.875rem;
}

/* 表单 */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 12px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 1rem;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-input::placeholder {
  color: var(--text-secondary);
}

textarea.form-input {
  resize: vertical;
  min-height: 100px;
}

/* 卡片 */
.card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 4px 15px var(--shadow);
}

.card-header {
  font-size: 1.25rem;
  font-weight: bold;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

/* 登录页 */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  width: 100%;
  max-width: 400px;
}

.login-title {
  text-align: center;
  margin-bottom: 30px;
  color: var(--accent);
}

/* 发票列表 */
.month-group {
  margin-bottom: 20px;
}

.month-header {
  background-color: var(--bg-tertiary);
  padding: 12px 16px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s;
}

.month-header:hover {
  background-color: var(--border);
}

.month-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.month-header .count {
  background-color: var(--accent);
  color: white;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.875rem;
}

.month-content {
  display: none;
  padding: 10px 0;
}

.month-content.open {
  display: block;
}

.invoice-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background-color: var(--bg-primary);
  border-radius: 4px;
  margin-top: 8px;
}

.invoice-info {
  flex: 1;
}

.invoice-name {
  font-weight: 500;
  margin-bottom: 4px;
}

.invoice-meta {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.invoice-note {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 4px;
  font-style: italic;
}

/* 搜索框 */
.search-box {
  margin-bottom: 20px;
}

.search-input {
  width: 100%;
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 1rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* 上传区域 */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background-color: rgba(233, 69, 96, 0.1);
}

.upload-zone-icon {
  font-size: 3rem;
  margin-bottom: 10px;
}

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

.file-preview {
  margin-top: 20px;
  padding: 15px;
  background-color: var(--bg-primary);
  border-radius: 4px;
  display: none;
}

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

.progress-bar {
  height: 8px;
  background-color: var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 10px;
}

.progress-fill {
  height: 100%;
  background-color: var(--success);
  width: 0%;
  transition: width 0.3s;
}

/* 下载记录表格 */
.logs-table {
  width: 100%;
  border-collapse: collapse;
}

.logs-table th,
.logs-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.logs-table th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
}

.logs-table tr:hover {
  background-color: var(--bg-primary);
}

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}

.pagination button {
  padding: 8px 16px;
  background-color: var(--bg-tertiary);
  border: none;
  border-radius: 4px;
  color: var(--text-primary);
  cursor: pointer;
}

.pagination button:hover:not(:disabled) {
  background-color: var(--accent);
}

.pagination button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination span {
  padding: 8px 16px;
  color: var(--text-secondary);
}

/* 提示信息 */
.alert {
  padding: 12px 16px;
  border-radius: 4px;
  margin-bottom: 20px;
}

.alert-error {
  background-color: rgba(255, 107, 107, 0.2);
  color: var(--error);
  border: 1px solid var(--error);
}

.alert-success {
  background-color: rgba(78, 204, 163, 0.2);
  color: var(--success);
  border: 1px solid var(--success);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 10px;
}

/* 加载状态 */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* 隐藏元素 */
.hidden {
  display: none !important;
}