:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-bg: #eff6ff;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --green: #22c55e;
  --green-bg: #f0fdf4;
  --red: #ef4444;
  --red-bg: #fef2f2;
  --orange: #f97316;
  --orange-bg: #fff7ed;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  min-height: 100vh;
}

.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  padding: 0 24px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.header-stats {
  display: flex;
  gap: 24px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-label {
  font-size: 12px;
  opacity: 0.8;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
}

.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary-bg) 0%, var(--gray-100) 100%);
}

.login-card {
  background: var(--white);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
  max-width: 380px;
  width: 90%;
}

.login-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: var(--primary-bg);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.login-card h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.login-card p {
  font-size: 14px;
  color: var(--gray-400);
  margin-bottom: 24px;
}

.btn-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 32px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-login:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 20px;
  border-left: 1px solid rgba(255,255,255,0.2);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.3);
  display: none;
}

.user-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--white);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-logout {
  padding: 4px 12px;
  background: rgba(255,255,255,0.15);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-logout:hover {
  background: rgba(255,255,255,0.25);
}

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

.toolbar h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-700);
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--white);
  color: var(--primary);
  border: 1px solid var(--primary-light);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 14px;
  font-family: monospace;
  box-sizing: border-box;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.btn-refresh {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  color: var(--primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.device-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.device-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
  transform: translateY(-1px);
}

.device-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
}

.device-card.offline::before {
  background: var(--gray-400);
}

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

.device-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.device-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-bg);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.device-brand-text h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
}

.device-brand-text span {
  font-size: 13px;
  color: var(--gray-500);
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.status-badge.online {
  background: var(--green-bg);
  color: var(--green);
}

.status-badge.offline {
  background: var(--gray-100);
  color: var(--gray-400);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-badge.online .status-dot {
  background: var(--green);
  animation: pulse 2s infinite;
}

.status-badge.offline .status-dot {
  background: var(--gray-400);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.device-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-label {
  font-size: 12px;
  color: var(--gray-400);
}

.info-value {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
}

.battery-bar {
  width: 100%;
  height: 6px;
  background: var(--gray-200);
  border-radius: 3px;
  margin-top: 4px;
  overflow: hidden;
}

.battery-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease;
}

.battery-fill.high { background: var(--green); }
.battery-fill.medium { background: var(--orange); }
.battery-fill.low { background: var(--red); }

.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--gray-400);
  gap: 12px;
}

.empty-state p {
  font-size: 16px;
}

.loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px;
  color: var(--gray-400);
}

@media (max-width: 640px) {
  .header-content {
    height: auto;
    padding: 12px 0;
    flex-direction: column;
    gap: 8px;
  }

  .main {
    padding: 16px;
  }

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

  .device-info {
    grid-template-columns: 1fr 1fr;
  }
}

.device-actions {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--gray-200);
}

.btn-browse {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-top {
  z-index: 300;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius);
  width: 90%;
  max-width: 700px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
}

.btn-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--gray-400);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}

.btn-close:hover {
  background: var(--gray-100);
  color: var(--gray-600);
}

.modal-path {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-200);
}

.file-toolbar {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-200);
  align-items: center;
}

.file-toolbar input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 13px;
  font-family: monospace;
}

.file-toolbar input:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.btn-go {
  padding: 8px 16px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}

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

.file-list {
  overflow-y: auto;
  padding: 8px;
  flex: 1;
  min-height: 200px;
}

.file-list-detail {
  overflow-y: auto;
  padding: 8px;
  flex: 1;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: default;
  transition: background 0.15s;
}

.file-item:hover {
  background: var(--gray-50);
}

.file-dir {
  cursor: pointer;
}

.file-dir:hover {
  background: var(--primary-bg);
}

.file-icon {
  font-size: 16px;
  flex-shrink: 0;
}

.file-name {
  flex: 1;
  font-size: 13px;
  color: var(--gray-700);
  min-width: 0;
  word-break: break-all;
}

.file-size {
  font-size: 12px;
  color: var(--gray-400);
  flex-shrink: 0;
  min-width: 60px;
  text-align: right;
  font-family: 'Consolas', 'Monaco', monospace;
}

.file-perm {
  font-size: 11px;
  color: var(--gray-400);
  font-family: monospace;
  flex-shrink: 0;
}

.file-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s;
}

.file-item:hover .file-actions {
  opacity: 1;
}

.btn-file-action {
  background: none;
  border: none;
  font-size: 14px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background 0.15s;
  line-height: 1;
}

.btn-file-action:hover {
  background: var(--gray-200);
}

.btn-delete:hover {
  background: var(--red-bg);
}

.btn-upload {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  background: var(--green);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-upload:hover {
  background: #16a34a;
}

.modal-preview {
  max-width: 900px;
}

.preview-body {
  padding: 16px 20px;
  overflow: auto;
  flex: 1;
  min-height: 200px;
  max-height: 60vh;
}

.preview-body pre {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-700);
  white-space: pre-wrap;
  word-break: break-all;
  margin: 0;
}

.modal-dialog {
  max-width: 420px;
}

.dialog-body {
  padding: 20px;
  font-size: 14px;
  color: var(--gray-700);
  line-height: 1.6;
}

.dialog-body p {
  margin: 0;
}

.dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 12px 20px;
  border-top: 1px solid var(--gray-200);
}

.btn-dialog {
  padding: 8px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-cancel {
  background: var(--gray-100);
  color: var(--gray-600);
}

.btn-cancel:hover {
  background: var(--gray-200);
}

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

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

.modal-detail {
  max-width: 1100px;
  max-height: 90vh;
}

.detail-body {
  display: flex;
  gap: 0;
  min-height: 500px;
  max-height: calc(90vh - 60px);
}

.detail-left {
  width: 420px;
  flex-shrink: 0;
  padding: 20px;
  overflow-y: auto;
  border-right: 1px solid var(--gray-200);
}

.detail-right {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.info-section {
  margin-bottom: 16px;
}

.info-section h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin: 0 0 8px 0;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--gray-200);
}

.info-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.info-cell {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.cell-label {
  font-size: 12px;
  color: var(--gray-400);
  min-width: 60px;
  flex-shrink: 0;
}

.cell-value {
  font-size: 13px;
  color: var(--gray-700);
  word-break: break-all;
}

.cell-mono {
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 12px;
}

.status-online { color: #16a34a; }
.status-offline { color: var(--gray-400); }

.detail-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.btn-detail-action {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-detail-action.btn-danger {
  background: #dc2626;
}

.btn-detail-action.btn-danger:hover {
  background: #b91c1c;
}

.reboot-mode-list {
  padding: 8px;
}

.reboot-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background 0.15s;
  border-radius: 8px;
}

.reboot-option:hover {
  background: var(--primary-bg);
}

.reboot-icon {
  font-size: 16px;
  flex-shrink: 0;
  width: 22px;
  text-align: center;
}

.reboot-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  min-width: 80px;
}

.reboot-desc {
  font-size: 11px;
  color: var(--gray-400);
}

.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--gray-200);
  padding: 0 16px;
}

.tab-btn {
  padding: 10px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: 14px;
  color: var(--gray-400);
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.tab-content {
  display: none;
  flex: 1;
  flex-direction: column;
  min-height: 0;
}

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

.terminal-input-row {
  display: flex;
  gap: 6px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-200);
  align-items: center;
}

.terminal-input-row input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 13px;
  font-family: 'Consolas', 'Monaco', monospace;
  outline: none;
}

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

.btn-exec {
  padding: 8px 16px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

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

.btn-script {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  background: #7c3aed;
  color: var(--white);
  border: none;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

.btn-script:hover {
  background: #6d28d9;
}

.quick-cmds {
  display: flex;
  gap: 4px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--gray-200);
  flex-wrap: wrap;
}

.quick-cmds button {
  padding: 4px 10px;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 4px;
  font-size: 12px;
  font-family: 'Consolas', 'Monaco', monospace;
  color: var(--gray-600);
  cursor: pointer;
}

.quick-cmds button:hover {
  background: var(--gray-200);
}

.terminal-output {
  flex: 1;
  background: #1e1e1e;
  color: #d4d4d4;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  line-height: 1.5;
  padding: 12px 16px;
  overflow-y: auto;
  min-height: 200px;
}

.terminal-idle {
  color: #666;
  font-style: italic;
}

.terminal-cmd {
  color: #569cd6;
  margin-bottom: 4px;
}

.terminal-status {
  color: #dcdcaa;
  font-size: 12px;
  margin-bottom: 8px;
}

.terminal-result {
  white-space: pre-wrap;
  word-break: break-all;
  color: #9cdcfe;
  max-height: 400px;
  overflow-y: auto;
}

.terminal-error {
  color: #f44747;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.history-item {
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
  margin-bottom: 4px;
}

.history-item:hover {
  background: var(--gray-100);
}

.history-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.history-type {
  font-size: 14px;
}

.history-name {
  flex: 1;
  font-size: 13px;
  color: var(--gray-700);
  font-family: 'Consolas', 'Monaco', monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-status {
  font-size: 14px;
}

.history-meta {
  font-size: 11px;
  color: var(--gray-400);
  margin-top: 2px;
  padding-left: 24px;
}