:root {
  --primary: #407BFF;
  --primary-light: #5A8FFF;
  --secondary: #805AD5;
  --success: #28A745;
  --warning: #FFC107;
  --danger: #DC3545;
  --info: #17A2B8;
  
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-tertiary: #E9ECEF;
  --text-primary: #212529;
  --text-secondary: #6C757D;
  --text-muted: #ADB5BD;
  --border: #DEE2E6;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
}

[data-theme="dark"] {
  --bg-primary: #1A1A2E;
  --bg-secondary: #16213E;
  --bg-tertiary: #0F3460;
  --text-primary: #E8E8E8;
  --text-secondary: #A0A0A0;
  --text-muted: #6C6C6C;
  --border: #2D2D44;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  background: var(--bg-primary);
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.system-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--bg-secondary);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.admin-link {
  padding: 8px 16px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

.admin-link:hover {
  background: var(--primary-light);
}

.main-content {
  flex: 1;
  padding: 32px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.upload-section {
  display: flex;
  flex-direction: column;
}

.upload-card, .files-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
}

.upload-title, .files-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.upload-subtitle {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 14px;
}

.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  background: var(--bg-secondary);
}

.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary);
  background: rgba(64, 123, 255, 0.05);
}

.upload-icon {
  color: var(--primary);
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}

.upload-text {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-primary);
}

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

.upload-progress {
  margin-top: 24px;
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 4px;
  transition: width 0.3s;
  width: 0%;
}

.progress-text {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
}

.upload-result {
  text-align: center;
  margin-top: 24px;
}

.result-icon {
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}

.result-icon.success {
  color: var(--success);
}

.result-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.result-filename {
  font-size: 15px;
  color: var(--text-primary);
  margin-bottom: 4px;
  word-break: break-all;
}

.result-size {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.result-links {
  text-align: left;
  margin-bottom: 24px;
}

.link-item {
  margin-bottom: 16px;
}

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

.link-input-group {
  display: flex;
  gap: 8px;
}

.link-input-group input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.copy-btn {
  padding: 10px 16px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.2s;
}

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

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

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

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

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

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-large {
  padding: 14px 32px;
  font-size: 16px;
}

.files-list {
  max-height: 500px;
  overflow-y: auto;
}

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

.file-item:hover {
  background: var(--bg-secondary);
}

.file-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  color: var(--primary);
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.file-badge {
  padding: 2px 8px;
  background: var(--warning);
  color: white;
  border-radius: 10px;
  font-size: 11px;
  margin-left: 8px;
}

.file-badge.permanent {
  background: var(--success);
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.footer {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 13px;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.modal-content h3 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 14px;
}

.modal-content input {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 20px;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.admin-container {
  min-height: 100vh;
  background: var(--bg-secondary);
}

.login-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.login-logo {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin: 0 auto 24px;
}

.login-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.login-subtitle {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 14px;
}

.login-form {
  text-align: left;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: border-color 0.2s;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

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

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

.captcha-group input {
  flex: 1;
}

.captcha-img {
  width: 120px;
  height: 44px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.captcha-img svg {
  width: 100%;
  height: 100%;
}

.login-footer {
  margin-top: 24px;
  text-align: center;
}

.login-footer a {
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
}

.login-footer a:hover {
  text-decoration: underline;
}

.admin-section {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.sidebar-header {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 18px;
  color: var(--text-primary);
}

.sidebar-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-item:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(64, 123, 255, 0.1);
  color: var(--primary);
  font-weight: 500;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border);
}

.logout-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

.logout-btn:hover {
  background: var(--bg-secondary);
  color: var(--danger);
}

.admin-main {
  flex: 1;
  margin-left: 240px;
  display: flex;
  flex-direction: column;
}

.admin-header {
  background: var(--bg-primary);
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.admin-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.admin-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.admin-user {
  font-size: 14px;
  color: var(--text-secondary);
}

.admin-content {
  flex: 1;
  padding: 24px 32px;
}

.page-content {
  animation: fadeIn 0.3s ease;
}

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

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow);
}

.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon.blue {
  background: rgba(64, 123, 255, 0.1);
  color: var(--primary);
}

.stat-icon.purple {
  background: rgba(128, 90, 213, 0.1);
  color: var(--secondary);
}

.stat-icon.green {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success);
}

.stat-icon.orange {
  background: rgba(255, 193, 7, 0.1);
  color: var(--warning);
}

.stat-info {
  flex: 1;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.info-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.info-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.info-value {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.page-header h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.table-container {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  background: var(--bg-secondary);
  padding: 14px 20px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 14px 20px;
  font-size: 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: var(--bg-secondary);
}

.data-table .loading {
  text-align: center;
  padding: 40px;
}

.action-btn {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  margin-right: 8px;
  transition: all 0.2s;
}

.action-btn.primary {
  background: rgba(64, 123, 255, 0.1);
  color: var(--primary);
}

.action-btn.primary:hover {
  background: rgba(64, 123, 255, 0.2);
}

.action-btn.danger {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger);
}

.action-btn.danger:hover {
  background: rgba(220, 53, 69, 0.2);
}

.action-btn.success {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success);
}

.action-btn.success:hover {
  background: rgba(40, 167, 69, 0.2);
}

.config-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
  max-width: 800px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-actions {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.log-tabs {
  display: flex;
  gap: 8px;
}

.log-tab {
  padding: 8px 16px;
  border: none;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

.log-tab:hover {
  background: var(--border);
}

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

.backup-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 500px;
  margin: 0 auto;
}

.backup-info {
  margin-bottom: 32px;
}

.backup-info svg {
  color: var(--primary);
  margin-bottom: 16px;
}

.backup-info h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.backup-info p {
  color: var(--text-secondary);
  font-size: 14px;
}

.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 14px 24px;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  animation: slideIn 0.3s ease;
  font-size: 14px;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s;
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .admin-main {
    margin-left: 0;
  }
}

@media (max-width: 640px) {
  .header {
    padding: 12px 16px;
  }
  
  .main-content {
    padding: 16px;
  }
  
  .upload-card, .files-card {
    padding: 20px;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .admin-content {
    padding: 16px;
  }
  
  .admin-header {
    padding: 16px;
  }
  
  .nav-badge {
    display: inline-block;
    min-width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: var(--danger);
    border-radius: 9px;
    padding: 0 5px;
    margin-left: auto;
  }
  
  .log-tabs {
    display: flex;
    gap: 8px;
  }
  
  .log-tab {
    padding: 6px 16px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
  }
  
  .log-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
  }
  
  .log-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
  } 12px 16px;
  }
}

/* ==================== Toast 提示消息 ==================== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  z-index: 10000;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  max-width: 90%;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.toast-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

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

.toast-success {
  background: var(--success);
  color: #fff;
}

.toast-warning {
  background: var(--warning);
  color: #fff;
}

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

/* ==================== 确认弹窗 ==================== */
.confirm-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.confirm-modal-show {
  opacity: 1;
  visibility: visible;
}

.confirm-modal-closing {
  opacity: 0;
  visibility: hidden;
}

.confirm-modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: modalSlideIn 0.2s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.confirm-modal-header {
  padding: 24px 24px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
}

.confirm-modal-icon {
  font-size: 28px;
}

.confirm-modal-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.confirm-modal-body {
  padding: 20px 24px;
}

.confirm-modal-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.confirm-modal-footer {
  padding: 16px 24px 24px;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ==================== 全局加载遮罩 ==================== */
.global-loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10001;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.loading-show {
  opacity: 1;
  visibility: visible;
}

.loading-content {
  text-align: center;
  color: #fff;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

.loading-spinner.small {
  width: 24px;
  height: 24px;
  border-width: 2px;
  margin: 0;
}

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

.loading-text {
  font-size: 14px;
  margin: 0;
}

/* ==================== 按钮加载状态 ==================== */
.btn-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-right: 8px;
  vertical-align: middle;
}

.btn-default .btn-spinner {
  border-color: rgba(0, 0, 0, 0.2);
  border-top-color: var(--text-primary);
}

/* ==================== 骨架屏 ==================== */
.skeleton {
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.skeleton::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  animation: skeletonShine 1.5s infinite;
}

[data-theme="dark"] .skeleton::after {
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.05),
    transparent
  );
}

@keyframes skeletonShine {
  to { left: 100%; }
}

.skeleton-line {
  height: 14px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.skeleton-line-short {
  width: 40%;
}

.skeleton-line-large {
  width: 80%;
  height: 28px;
}

.stat-card.skeleton {
  min-height: 100px;
}

/* ==================== 空状态 ==================== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
}

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

.empty-state p {
  margin: 0 0 8px;
  font-size: 14px;
}

.empty-hint {
  font-size: 12px;
  opacity: 0.7;
}

/* ==================== 错误状态 ==================== */
.error-state {
  text-align: center;
  padding: 32px;
  color: var(--text-secondary);
}

.error-state p {
  margin: 0 0 16px;
}

/* ==================== 表单错误提示 ==================== */
.field-error {
  display: none;
  font-size: 12px;
  color: var(--danger);
  margin-top: 6px;
  line-height: 1.4;
}

.input-error {
  border-color: var(--danger) !important;
}

.input-error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1) !important;
}

.field-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
  line-height: 1.4;
}

/* ==================== 密码显示切换 ==================== */
.input-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  font-size: 16px;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.password-toggle:hover {
  opacity: 1;
}

.eye-icon {
  display: inline-block;
}

/* ==================== 徽章 ==================== */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
}

.badge-default {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.badge-primary {
  background: rgba(64, 123, 255, 0.1);
  color: var(--primary);
}

.badge-success {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(255, 193, 7, 0.15);
  color: var(--warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.badge-info {
  background: rgba(23, 162, 184, 0.1);
  color: #17a2b8;
}

/* ==================== 登录页增强 ==================== */
.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.login-title {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.login-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

.label-icon {
  margin-right: 6px;
  font-size: 14px;
}

.captcha-wrapper {
  display: flex;
  gap: 12px;
}

.captcha-input {
  flex: 1;
}

.captcha-image-wrapper {
  width: 120px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s;
  flex-shrink: 0;
}

.captcha-image-wrapper:hover {
  border-color: var(--primary);
}

.captcha-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.captcha-refresh-hint {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  font-size: 10px;
  text-align: center;
  padding: 2px 0;
  opacity: 0;
  transition: opacity 0.2s;
}

.captcha-image-wrapper:hover .captcha-refresh-hint {
  opacity: 1;
}

.login-footer {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.back-home-link {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.back-home-link:hover {
  color: var(--primary);
}

.login-tips p {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
}

.login-bg-decoration {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  z-index: -1;
}

.bg-circle {
  position: absolute;
  border-radius: 50%;
  opacity: 0.3;
  filter: blur(60px);
}

.bg-circle-1 {
  width: 400px;
  height: 400px;
  background: var(--primary);
  top: -100px;
  right: -100px;
}

.bg-circle-2 {
  width: 300px;
  height: 300px;
  background: var(--secondary);
  bottom: -50px;
  left: -50px;
}

.bg-circle-3 {
  width: 200px;
  height: 200px;
  background: var(--success);
  top: 50%;
  left: 30%;
  opacity: 0.15;
}

/* ==================== 侧边栏增强 ==================== */
.sidebar-header {
  padding: 20px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.sidebar-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-divider {
  height: 1px;
  background: var(--border);
  margin: 12px 16px;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.logout-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.logout-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--danger);
  color: var(--danger);
}

/* ==================== 顶部栏增强 ==================== */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-primary);
}

.header-left {
  display: flex;
  align-items: center;
}

.page-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all 0.2s;
}

.header-btn:hover {
  border-color: var(--primary);
  background: var(--bg-primary);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
}

.user-details {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.user-role {
  font-size: 11px;
  color: var(--text-secondary);
  padding: 2px 6px;
  background: var(--bg-secondary);
  border-radius: 4px;
}

/* ==================== 页面区块 ==================== */
.page-section {
  margin-bottom: 32px;
}

.section-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-icon {
  font-size: 18px;
}

/* ==================== 快捷操作 ==================== */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.quick-action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
}

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

.quick-icon {
  font-size: 28px;
}

.quick-text {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
}

/* ==================== 存储进度条 ==================== */
.storage-info {
  margin-bottom: 20px;
  padding: 16px 20px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}

.storage-bar {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 10px;
}

.storage-used {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 4px;
  transition: width 0.5s ease;
}

.storage-text {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.storage-percent {
  margin-left: auto;
  font-weight: 600;
  color: var(--primary);
}

/* ==================== 提示信息条 ==================== */
.info-note,
.warning-note {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  line-height: 1.5;
}

.info-note {
  background: rgba(64, 123, 255, 0.1);
  border: 1px solid rgba(64, 123, 255, 0.2);
  color: var(--primary);
}

.warning-note {
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.2);
  color: var(--warning);
}

.note-icon {
  font-size: 16px;
  flex-shrink: 0;
  margin-top: 1px;
}

.note-text {
  flex: 1;
}

/* ==================== 表格状态 ==================== */
.table-loading,
.table-empty,
.table-error {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
}

.table-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.table-empty .empty-state {
  padding: 0;
}

.table-error {
  color: var(--danger);
}

.table-error button {
  margin-left: 12px;
}

/* ==================== 文件单元格 ==================== */
.file-cell {
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-icon-small {
  font-size: 20px;
  flex-shrink: 0;
}

.file-name-text {
  font-size: 14px;
  color: var(--text-primary);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ==================== 通知表格 ==================== */
.notifications-table .notification-row {
  cursor: pointer;
  transition: background 0.2s;
}

.notifications-table .notification-row:hover {
  background: var(--bg-secondary);
}

.notifications-table .notification-row.unread {
  background: rgba(64, 123, 255, 0.05);
}

.notifications-table .notification-row.unread:hover {
  background: rgba(64, 123, 255, 0.08);
}

.notif-icon {
  font-size: 18px;
}

.notif-title {
  position: relative;
  font-weight: 500;
  color: var(--text-primary);
  padding-left: 16px;
}

.notification-row.unread .notif-title {
  font-weight: 600;
}

.unread-dot {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
}

.notif-content {
  color: var(--text-secondary);
  font-size: 13px;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.col-icon {
  width: 40px;
  text-align: center;
}

.col-time {
  width: 120px;
  text-align: right;
}

/* ==================== 配置表单 ==================== */
.config-section {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.config-section-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 20px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.config-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  margin-top: 24px;
}

/* ==================== 日志内容 ==================== */
.logs-container {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow);
  max-height: 600px;
  overflow-y: auto;
}

.logs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.log-item {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.6;
}

.log-time {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-family: monospace;
}

.log-content-text {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.log-method {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.log-method-get {
  background: rgba(40, 167, 69, 0.15);
  color: var(--success);
}

.log-method-post {
  background: rgba(64, 123, 255, 0.15);
  color: var(--primary);
}

.log-method-put {
  background: rgba(255, 193, 7, 0.15);
  color: var(--warning);
}

.log-method-delete {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.log-path {
  font-family: monospace;
  color: var(--text-primary);
  flex: 1;
}

.log-ip {
  font-family: monospace;
  color: var(--text-muted);
  font-size: 12px;
}

.log-module {
  font-weight: 600;
  color: var(--primary);
}

.log-type {
  font-weight: 500;
  color: var(--text-primary);
}

.log-desc {
  color: var(--text-secondary);
}

.log-level {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.log-level-high {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.log-level-medium {
  background: rgba(255, 193, 7, 0.15);
  color: var(--warning);
}

.log-level-low {
  background: rgba(64, 123, 255, 0.15);
  color: var(--primary);
}

.logs-loading {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* ==================== 备份卡片 ==================== */
.backup-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.backup-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.backup-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--text-primary);
}

.backup-card > p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0 0 20px;
  line-height: 1.6;
}

.backup-tips {
  text-align: left;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 24px;
}

.backup-tips p {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 8px;
  line-height: 1.5;
}

.backup-tips p:last-child {
  margin-bottom: 0;
}

.backup-info-list {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.backup-info-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.backup-info-item .info-label {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 100px;
  font-size: 14px;
}

.backup-info-item .info-desc {
  color: var(--text-secondary);
  font-size: 13px;
}

/* ==================== 角色选择下拉 ==================== */
.role-select {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.2s;
  max-width: 90px;
  flex-shrink: 0;
}

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

.role-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(64, 123, 255, 0.1);
}

.role-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==================== 页面头部操作区 ==================== */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.page-subtitle {
  font-size: 18px;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}

.page-actions {
  display: flex;
  gap: 10px;
}

/* ==================== 信息行 ==================== */
.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.info-row:last-child {
  border-bottom: none;
}

.info-row .info-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.info-row .info-value {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

/* ==================== 按钮尺寸 ==================== */
.btn-lg {
  padding: 12px 24px;
  font-size: 15px;
}

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

.btn-block {
  width: 100%;
}

/* ==================== 响应式增强 ==================== */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 640px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .quick-actions {
    grid-template-columns: 1fr;
  }

  .config-grid {
    grid-template-columns: 1fr;
  }

  .admin-header {
    padding: 12px 16px;
  }

  .admin-content {
    padding: 16px;
  }

  .page-title {
    font-size: 16px;
  }

  .user-details {
    display: none;
  }

  .captcha-wrapper {
    flex-direction: column;
  }

  .captcha-image-wrapper {
    width: 100%;
  }

  .login-footer {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
  transition: background 0.2s;
}

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

/* ==================== 选中文字样式 ==================== */
::selection {
  background: rgba(64, 123, 255, 0.3);
  color: var(--text-primary);
}

/* ==================== 焦点可见性 ==================== */
button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ==================== 弹窗样式 ==================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.3s ease;
}

.modal-content.modal-large {
  max-width: 800px;
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  flex-shrink: 0;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 用户协议内容 */
.terms-content {
  line-height: 1.8;
  color: var(--text-secondary);
}

.terms-content h4 {
  color: var(--text-primary);
  font-size: 16px;
  margin: 20px 0 10px;
  font-weight: 600;
}

.terms-content h4:first-child {
  margin-top: 0;
}

.terms-content p {
  margin: 8px 0;
  font-size: 14px;
}

/* 用户文件信息 */
.user-files-info {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.user-files-info .info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.user-files-info .info-label {
  font-size: 12px;
  color: var(--text-secondary);
}

.user-files-info .info-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

/* 角色选择下拉 */
.role-select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease;
  cursor: pointer;
}

.role-select:focus {
  border-color: var(--primary);
}

.role-select option {
  background: var(--card-bg);
  color: var(--text-primary);
}

/* 响应式弹窗 */
@media (max-width: 640px) {
  .modal-content {
    width: 95%;
    max-height: 95vh;
  }
  
  .modal-header {
    padding: 16px 20px;
  }
  
  .modal-body {
    padding: 20px;
  }
  
  .modal-footer {
    padding: 12px 20px;
  }
  
  .user-files-info {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==================== 第四版新增样式 ==================== */

/* 搜索框 */
.search-box {
  position: relative;
  flex: 1;
  max-width: 300px;
}

.search-input {
  width: 100%;
  padding: 10px 14px 10px 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease;
}

.search-input:focus {
  border-color: var(--primary);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  color: var(--text-tertiary);
  pointer-events: none;
}

/* 页面头部操作区 */
.page-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* 用户文件信息卡片 */
.user-files-header {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.user-files-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-files-info {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.user-info-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 16px;
}

.user-info-label {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.user-info-value {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.user-info-value .badge {
  font-size: 12px;
  font-weight: 500;
}

/* 返回按钮 */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 16px;
}

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

/* 密码显示切换 */
.input-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.password-toggle:hover {
  opacity: 1;
}

.eye-icon {
  display: inline-block;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease;
  box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-tertiary);
}

.field-hint {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 6px;
  line-height: 1.5;
}

/* 字段错误 */
.field-error {
  font-size: 12px;
  color: var(--danger-color);
  margin-top: 6px;
  display: none;
  line-height: 1.4;
}

.input-error {
  border-color: var(--danger-color) !important;
}

/* 用户协议勾选 */
.terms-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 16px 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.terms-checkbox input[type="checkbox"] {
  margin-top: 2px;
  cursor: pointer;
  flex-shrink: 0;
}

.terms-link {
  color: var(--primary);
  text-decoration: none;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.terms-link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

/* 协议内容 */
.terms-content {
  line-height: 1.8;
  color: var(--text-secondary);
  font-size: 14px;
}

.terms-content h4 {
  color: var(--text-primary);
  font-size: 16px;
  margin: 20px 0 10px;
  font-weight: 600;
}

.terms-content h4:first-child {
  margin-top: 0;
}

.terms-content p {
  margin: 8px 0;
}

.table-actions {
  display: flex !important;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
  min-width: 180px;
}

/* 表格操作列按钮间距 */
.table-actions .btn + .btn,
.table-actions .btn + .role-select,
.table-actions .role-select + .btn {
  margin-left: 6px;
}

.table-actions .btn-sm {
  padding: 4px 8px;
  font-size: 12px;
  flex-shrink: 0;
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .user-files-info {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .page-header-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-box {
    max-width: 100%;
  }
  
  .user-files-info {
    grid-template-columns: 1fr;
  }
  
  .table-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }
  
  .table-actions .btn + .btn,
  .table-actions .btn + .role-select,
  .table-actions .role-select + .btn {
    margin-left: 0;
  }
}