/* ========================================
   Churn Dashboard
   Apple-Inspired Conversion Funnel Analytics
   ======================================== */

/* Import premium fonts */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,100..1000&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* Dashboard-specific variables */
.churn-dashboard {
  --churn-bg: #f5f5f7;
  --churn-surface: #ffffff;
  --churn-surface-elevated: #ffffff;
  --churn-border: rgba(0, 0, 0, 0.06);
  --churn-border-subtle: rgba(0, 0, 0, 0.04);

  /* Typography */
  --churn-text-primary: #1d1d1f;
  --churn-text-secondary: #86868b;
  --churn-text-tertiary: #aeaeb2;

  /* Funnel colors - gradient from cool to warm */
  --churn-funnel-1: #007aff; /* Visitors - Blue */
  --churn-funnel-2: #5856d6; /* Registrations - Indigo */
  --churn-funnel-3: #af52de; /* Verifications - Purple */
  --churn-funnel-4: #ff2d55; /* Purchases - Pink */
  --churn-funnel-5: #ff9500; /* Self-hosting - Orange */

  /* Semantic */
  --churn-positive: #34c759;
  --churn-positive-bg: rgba(52, 199, 89, 0.1);
  --churn-negative: #ff3b30;
  --churn-negative-bg: rgba(255, 59, 48, 0.1);
  --churn-neutral: #8e8e93;

  /* Shadows */
  --churn-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --churn-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --churn-shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);

  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (prefers-color-scheme: dark) {
  .churn-dashboard {
    --churn-bg: #000000;
    --churn-surface: #1c1c1e;
    --churn-surface-elevated: #2c2c2e;
    --churn-border: rgba(255, 255, 255, 0.1);
    --churn-border-subtle: rgba(255, 255, 255, 0.06);

    --churn-text-primary: #f5f5f7;
    --churn-text-secondary: #98989d;
    --churn-text-tertiary: #636366;

    --churn-positive-bg: rgba(52, 199, 89, 0.2);
    --churn-negative-bg: rgba(255, 59, 48, 0.2);

    --churn-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --churn-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --churn-shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
  }
}

/* Base container */
.churn-dashboard {
  min-height: 100vh;
  background: var(--churn-bg);
  padding: 0 0 80px 0;
}

.churn-mono {
  font-family: 'JetBrains Mono', 'SF Mono', monospace;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

/* ========================================
   Header with Period Selector
   ======================================== */
.churn-header {
  background: var(--churn-surface);
  border-bottom: 1px solid var(--churn-border);
  padding: 40px 0 24px;
  margin-bottom: 32px;
}

.churn-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.churn-header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}

.churn-title {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--churn-text-primary);
  margin: 0 0 6px 0;
}

.churn-subtitle {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--churn-text-secondary);
  margin: 0;
}

/* Period selector pills */
.churn-period-selector {
  display: flex;
  gap: 4px;
  background: var(--churn-border-subtle);
  padding: 4px;
  border-radius: 10px;
}

.churn-period-btn {
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--churn-text-secondary);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.churn-period-btn:hover {
  color: var(--churn-text-primary);
}

.churn-period-btn.active {
  background: var(--churn-surface);
  color: var(--churn-text-primary);
  box-shadow: var(--churn-shadow-sm);
}

/* Navigation breadcrumb */
.churn-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.churn-nav-link {
  font-size: 0.875rem;
  color: var(--churn-text-tertiary);
  text-decoration: none;
  transition: color 0.2s;
}

.churn-nav-link:hover {
  color: var(--churn-text-primary);
}

.churn-nav-separator {
  color: var(--churn-text-tertiary);
}

.churn-nav-current {
  font-size: 0.875rem;
  color: var(--churn-text-secondary);
  font-weight: 500;
}

/* ========================================
   Content Container
   ======================================== */
.churn-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ========================================
   Funnel Visualization
   ======================================== */
.churn-funnel-section {
  margin-bottom: 32px;
}

.churn-section-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--churn-text-primary);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.churn-funnel {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--churn-surface);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--churn-shadow-md);
  position: relative;
  overflow: hidden;
}

.churn-funnel-stage {
  display: grid;
  grid-template-columns: 200px 1fr 120px 100px;
  align-items: center;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--churn-border-subtle);
  position: relative;
}

.churn-funnel-stage:last-child {
  border-bottom: none;
}

.churn-funnel-stage::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--stage-color);
  border-radius: 2px;
  opacity: 0;
  transition: opacity 0.2s;
}

.churn-funnel-stage:hover::before {
  opacity: 1;
}

.churn-stage-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.churn-stage-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--stage-color);
  opacity: 0.9;
  flex-shrink: 0;
}

.churn-stage-icon svg {
  width: 22px;
  height: 22px;
  color: white;
}

.churn-stage-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--churn-text-primary);
}

.churn-stage-desc {
  font-size: 0.75rem;
  color: var(--churn-text-tertiary);
  margin-top: 2px;
}

/* Funnel bar */
.churn-funnel-bar-container {
  position: relative;
  height: 40px;
  display: flex;
  align-items: center;
}

.churn-funnel-bar-bg {
  position: absolute;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--churn-border);
  border-radius: 4px;
}

.churn-funnel-bar {
  position: absolute;
  left: 0;
  height: 8px;
  background: var(--stage-color);
  border-radius: 4px;
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 4px;
}

.churn-funnel-bar.animated {
  animation: churn-bar-grow 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes churn-bar-grow {
  from { width: 0; }
}

/* Stage value */
.churn-stage-value {
  text-align: right;
}

.churn-stage-count {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--churn-text-primary);
}

.churn-stage-rate {
  font-size: 0.75rem;
  color: var(--churn-text-tertiary);
  margin-top: 2px;
}

/* Change indicator */
.churn-stage-change {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  font-size: 0.8125rem;
  font-weight: 600;
}

.churn-stage-change.positive {
  color: var(--churn-positive);
}

.churn-stage-change.negative {
  color: var(--churn-negative);
}

.churn-stage-change.neutral {
  color: var(--churn-neutral);
}

.churn-stage-change svg {
  width: 14px;
  height: 14px;
}

/* Disabled/placeholder state */
.churn-funnel-stage.disabled {
  opacity: 0.5;
}

.churn-stage-badge {
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--churn-border);
  color: var(--churn-text-tertiary);
  margin-left: 8px;
}

/* ========================================
   Period Comparison Cards
   ======================================== */
.churn-comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

@media (max-width: 768px) {
  .churn-comparison-grid {
    grid-template-columns: 1fr;
  }
}

.churn-comparison-card {
  background: var(--churn-surface);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--churn-shadow-sm);
}

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

.churn-comparison-title {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--churn-text-tertiary);
}

.churn-comparison-period {
  font-size: 0.75rem;
  color: var(--churn-text-tertiary);
}

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

.churn-comparison-metric {
  text-align: center;
  padding: 12px;
  border-radius: 8px;
  background: var(--churn-border-subtle);
}

.churn-comparison-value {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--churn-text-primary);
}

.churn-comparison-label {
  font-size: 0.75rem;
  color: var(--churn-text-tertiary);
  margin-top: 4px;
}

/* ========================================
   Data Tables (Weekly/Daily Breakdown)
   ======================================== */
.churn-breakdown-section {
  margin-bottom: 32px;
}

.churn-breakdown-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.churn-tab-btn {
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--churn-text-secondary);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.churn-tab-btn:hover {
  background: var(--churn-border-subtle);
}

.churn-tab-btn.active {
  background: var(--churn-surface);
  color: var(--churn-text-primary);
  box-shadow: var(--churn-shadow-sm);
}

.churn-breakdown-card {
  background: var(--churn-surface);
  border-radius: 16px;
  box-shadow: var(--churn-shadow-sm);
  overflow: hidden;
}

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

.churn-breakdown-table th {
  text-align: left;
  padding: 14px 20px;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--churn-text-tertiary);
  background: var(--churn-border-subtle);
  border-bottom: 1px solid var(--churn-border);
}

.churn-breakdown-table th:not(:first-child) {
  text-align: right;
}

.churn-breakdown-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--churn-border-subtle);
  font-size: 0.875rem;
}

.churn-breakdown-table td:not(:first-child) {
  text-align: right;
}

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

.churn-breakdown-table tr {
  transition: background 0.15s ease;
}

.churn-breakdown-table tr:hover {
  background: var(--churn-border-subtle);
}

.churn-breakdown-date {
  color: var(--churn-text-primary);
  font-weight: 500;
}

.churn-breakdown-value {
  color: var(--churn-text-secondary);
}

.churn-breakdown-value.highlight {
  color: var(--churn-text-primary);
  font-weight: 600;
}

/* Mini sparkline bar in table */
.churn-mini-bar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.churn-mini-bar-track {
  width: 60px;
  height: 4px;
  background: var(--churn-border);
  border-radius: 2px;
  overflow: hidden;
}

.churn-mini-bar-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* ========================================
   Chart Area (Simple CSS Chart)
   ======================================== */
.churn-chart-section {
  margin-bottom: 32px;
}

.churn-chart-card {
  background: var(--churn-surface);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--churn-shadow-sm);
}

.churn-chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.churn-chart-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--churn-text-primary);
}

.churn-chart-legend {
  display: flex;
  gap: 16px;
}

.churn-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--churn-text-secondary);
}

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

/* Simple bar chart */
.churn-bar-chart {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 160px;
  padding-top: 20px;
}

.churn-bar-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  height: 100%;
}

.churn-bar-stack {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
  max-width: 40px;
}

.churn-bar {
  width: 100%;
  border-radius: 3px 3px 0 0;
  transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 2px;
}

.churn-bar-label {
  font-size: 0.625rem;
  color: var(--churn-text-tertiary);
  text-align: center;
  white-space: nowrap;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 900px) {
  .churn-funnel-stage {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .churn-funnel-bar-container {
    order: 2;
  }

  .churn-stage-value {
    text-align: left;
  }

  .churn-stage-change {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .churn-header {
    padding: 24px 0 20px;
  }

  .churn-header-inner,
  .churn-content {
    padding: 0 16px;
  }

  .churn-header-top {
    flex-direction: column;
    gap: 16px;
  }

  .churn-title {
    font-size: 1.75rem;
  }

  .churn-period-selector {
    width: 100%;
    justify-content: center;
  }

  .churn-funnel {
    padding: 20px;
    border-radius: 16px;
  }

  .churn-comparison-metrics {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Animations
   ======================================== */
@keyframes churn-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.churn-animate {
  animation: churn-fade-in 0.4s ease-out forwards;
}

.churn-animate-delay-1 { animation-delay: 0.05s; opacity: 0; }
.churn-animate-delay-2 { animation-delay: 0.1s; opacity: 0; }
.churn-animate-delay-3 { animation-delay: 0.15s; opacity: 0; }
.churn-animate-delay-4 { animation-delay: 0.2s; opacity: 0; }
.churn-animate-delay-5 { animation-delay: 0.25s; opacity: 0; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .churn-animate,
  .churn-funnel-bar,
  .churn-bar {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}