/* CSS Variables */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --bg-card-hover: #222;
  --text-primary: #fff;
  --text-secondary: #888;
  --text-muted: #555;
  --border-color: #333;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warning: #eab308;
  --danger: #ef4444;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

/* Login Page */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

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

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-icon {
  width: 48px;
  height: 48px;
  color: var(--accent);
  margin-bottom: 1rem;
}

.login-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.2s;
}

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

.error-message {
  color: var(--danger);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  min-height: 1.25rem;
}

.btn-primary {
  width: 100%;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-icon {
  width: 28px;
  height: 28px;
  color: var(--accent);
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

.btn-icon.loading svg {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.btn-secondary {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

/* Status Bar */
.status-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

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

.status-dot.online {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.status-dot.offline {
  background: var(--text-muted);
}

.status-time {
  margin-left: auto;
}

/* Main Content */
.main {
  padding: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem;
  color: var(--text-secondary);
}

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

/* Error Banner */
.error-banner {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}

/* Devices Grid */
.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

/* Device Card */
.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  transition: all 0.2s;
}

.device-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-muted);
}

.device-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.device-os-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 8px;
  font-size: 1.25rem;
  flex-shrink: 0;
}

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

.device-name {
  font-weight: 600;
  font-size: 1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-ip {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-family: monospace;
}

.device-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.device-status .status-dot {
  width: 8px;
  height: 8px;
}

.device-status.online {
  color: var(--success);
}

.device-status.offline {
  color: var(--text-secondary);
}

.device-status .last-seen {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.device-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-bottom: 1rem;
}

.tag {
  padding: 0.125rem 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.device-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.device-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-open {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}

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

.btn-open svg {
  width: 16px;
  height: 16px;
}

.btn-open.disabled {
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: not-allowed;
  pointer-events: none;
}

.no-devices {
  text-align: center;
  color: var(--text-secondary);
  padding: 2rem;
  grid-column: 1 / -1;
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .header-left {
    justify-content: center;
  }

  .status-bar {
    flex-wrap: wrap;
    justify-content: center;
  }

  .status-time {
    margin-left: 0;
    width: 100%;
    text-align: center;
    margin-top: 0.5rem;
  }

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