:root {
  --bg-color: #0d0f1a;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --accent-color: #3b82f6;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --glass-blur: blur(12px);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(0, 0, 0, 0.05);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  padding-bottom: 2rem;
  transition: background-color 0.3s ease;
}

/* Background Gradient Effect */
.bg-glow {
  position: fixed;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 50vh;
  background: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.15), transparent 70%);
  z-index: -1;
  pointer-events: none;
}

/* Container */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 1.5rem;
  padding-top: env(safe-area-inset-top, 1.5rem);
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success-color);
  box-shadow: 0 0 8px var(--success-color);
}
.dot.offline {
  background-color: var(--warning-color);
  box-shadow: 0 0 8px var(--warning-color);
}
.dot.loading {
  background-color: var(--accent-color);
  animation: pulse 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

/* Glass Card */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--card-border);
  border-radius: 1.5rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 10px 30px -10px rgba(0,0,0,0.1);
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.glass-card:active {
  transform: scale(0.98);
}

/* Summary Grid */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.summary-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.summary-value {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.05em;
}

.text-danger { color: var(--danger-color); }
.text-success { color: var(--success-color); }

/* Charts */
.chart-container {
  width: 100%;
  height: 250px;
  margin-top: 1rem;
}

.chart-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* Budgets */
.budget-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.budget-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.budget-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 500;
}

.budget-progress-bg {
  width: 100%;
  height: 8px;
  background-color: var(--card-border);
  border-radius: 4px;
  overflow: hidden;
}

.budget-progress-bar {
  height: 100%;
  background-color: var(--success-color);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.budget-progress-bar.warning {
  background-color: var(--warning-color);
}

.budget-progress-bar.danger {
  background-color: var(--danger-color);
}

/* Quick Add Button */
.fab {
  position: fixed;
  bottom: 2rem;
  bottom: calc(env(safe-area-inset-bottom, 2rem) + 1rem);
  right: 1.5rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-color), #60a5fa);
  color: white;
  border: none;
  font-size: 1.5rem;
  font-weight: max;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.5);
  cursor: pointer;
  outline: none;
  transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: 100;
  text-decoration: none;
}

.fab:active {
  transform: scale(0.9) translateY(4px);
}