:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --bg-color: #F3F4F6;
  --card-bg: #FFFFFF;
  --text-main: #111827;
  --text-muted: #6B7280;
  --border: #E5E7EB;
  --success: #10B981;
  --success-light: #D1FAE5;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius: 12px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 600px;
  padding: 20px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-lg);
}

.section {
  padding: 40px;
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

.section.active {
  display: block;
}

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

/* Header & Logo */
.header {
  text-align: center;
  margin-bottom: 30px;
}

.logo-circle {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), #8B5CF6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 15px;
  color: white;
  font-size: 24px;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
}

.header h2 {
  font-weight: 700;
  font-size: 24px;
  color: var(--text-main);
}

.subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 4px;
}

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

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

.input-wrapper {
  position: relative;
  margin-bottom: 20px;
}

.input-wrapper .icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: #9CA3AF;
}

input {
  width: 100%;
  padding: 12px 14px 12px 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.help-text {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* Buttons */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.btn.full-width {
  width: 100%;
}

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

.btn.primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn.primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-text-only {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.btn-text-only:hover {
  color: var(--text-main);
}

.mb-4 { margin-bottom: 16px; }

/* Dashboard */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border);
}

.dashboard-header h2 {
  font-size: 20px;
}

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

.btn.secondary.small {
  padding: 6px 12px;
  font-size: 13px;
  background: white;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

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

/* Status Card */
.status-card {
  background: #F8FAFC;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  margin-bottom: 30px;
}

.status-indicator {
  position: relative;
  width: 48px;
  height: 48px;
  margin-right: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.status-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--text-muted);
  z-index: 2;
  transition: var(--transition);
}

.pulse-ring {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: rgba(107, 114, 128, 0.2);
  z-index: 1;
}

/* Status Colors */
.status-card.running .status-dot { background-color: var(--success); }
.status-card.running .pulse-ring {
  background-color: var(--success);
  animation: pulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

.status-card.stopped .status-dot { background-color: var(--danger); }
.status-card.stopped .pulse-ring { display: none; }

.status-card.pending .status-dot,
.status-card.stopping .status-dot { background-color: var(--warning); }
.status-card.pending .pulse-ring,
.status-card.stopping .pulse-ring {
  background-color: var(--warning);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.5); opacity: 0.8; }
  100% { transform: scale(2.5); opacity: 0; }
}

.status-details {
  flex-grow: 1;
}

.status-details h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.status-text {
  font-size: 20px;
  font-weight: 600;
  text-transform: capitalize;
}

.status-card.running .status-text { color: var(--success); }
.status-card.stopped .status-text { color: var(--danger); }
.status-card.pending .status-text,
.status-card.stopping .status-text { color: var(--warning); }

.instance-id {
  font-size: 12px;
  color: var(--text-muted);
  font-family: monospace;
  margin-top: 4px;
}

/* Toggle Switch Button */
.toggle-btn {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  gap: 4px;
}

.toggle-btn i { font-size: 20px; }

/* Default / Loading */
.toggle-btn.disabled, .toggle-btn:disabled {
  background-color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.7;
}

/* Turn ON button (when stopped) */
.toggle-btn.btn-turn-on {
  background: linear-gradient(135deg, var(--success), #059669);
}
.toggle-btn.btn-turn-on:hover:not(:disabled) {
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.5);
  transform: scale(1.05);
}

/* Turn OFF button (when running) */
.toggle-btn.btn-turn-off {
  background: linear-gradient(135deg, var(--danger), #DC2626);
}
.toggle-btn.btn-turn-off:hover:not(:disabled) {
  box-shadow: 0 0 15px rgba(239, 68, 68, 0.5);
  transform: scale(1.05);
}

/* Logs Table */
.logs-container h3 {
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.table-wrapper {
  max-height: 250px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

th {
  background: #F8FAFC;
  padding: 10px 12px;
  font-weight: 600;
  color: var(--text-muted);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

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

.action-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}

.action-badge.start { background: var(--success-light); color: #065F46; }
.action-badge.stop { background: var(--danger-light); color: #991B1B; }

/* Toast Notification */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: var(--text-main);
  color: white;
  padding: 12px 24px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.loading-text { color: var(--text-muted); font-style: italic; }