:root {
  --bg: #F7F8FC;
  --surface: #FFFFFF;
  --surface2: #F0F2FA;
  --border: #E4E7F0;
  --text-primary: #0F1624;
  --text-secondary: #5A6478;
  --text-muted: #9AA3B5;
  --accent: #4F6EF7;
  --accent-soft: #EEF1FF;
  --danger: #EF4444;
  --danger-soft: #FEF2F2;
  --success: #10B981;
  --success-soft: #ECFDF5;
  --warning: #F59E0B;
  --warning-soft: #FFFBEB;
  --purple: #8B5CF6;
  --purple-soft: #F5F3FF;
  --sidebar-w: 224px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.10);
  --radius: 12px;
  --radius-sm: 8px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.5;
}

/* === SIDEBAR === */
.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform .3s ease;
}
.sidebar-logo {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
}
.sidebar-logo .brand {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .5px;
  text-transform: uppercase;
}
.sidebar-logo .tagline {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 400;
}
.sidebar-nav {
  padding: 12px 10px;
  flex: 1;
  overflow-y: auto;
}
.nav-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .8px;
  padding: 0 8px;
  margin: 12px 0 4px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 13px;
  transition: all .15s;
  text-decoration: none;
  margin-bottom: 1px;
}
.nav-item:hover { background: var(--surface2); color: var(--text-primary); }
.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.nav-icon { font-size: 15px; width: 20px; text-align: center; }
.sidebar-footer {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
}
.model-badge {
  background: var(--success-soft);
  color: var(--success);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 20px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.model-badge::before { content: '●'; font-size: 8px; }

/* === MAIN === */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === TOPBAR === */
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.topbar-title span { color: var(--text-muted); font-weight: 400; margin-left: 4px; font-size: 13px; }
.topbar-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}
.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
}
.filter-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}
select.filter-select {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  outline: none;
  transition: border-color .15s;
}
select.filter-select:focus { border-color: var(--accent); }
.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  background: var(--surface);
  transition: border-color .15s;
}
.search-box:focus-within { border-color: var(--accent); }
.search-box input {
  border: none;
  outline: none;
  font-size: 12px;
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
  width: 160px;
  background: transparent;
}
.search-box input::placeholder { color: var(--text-muted); }

/* === CONTENT === */
.content {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* === SECTION HEADER === */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title .icon { font-size: 16px; }
.section-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* === KPI GRID === */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
}
.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.kpi-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-accent, var(--accent));
  border-radius: var(--radius) var(--radius) 0 0;
}
.kpi-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .6px;
  margin-bottom: 10px;
}
.kpi-value {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1;
  letter-spacing: -1px;
}
.kpi-value.colored { color: var(--card-color, var(--accent)); }
.kpi-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
}
.kpi-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 20px;
  margin-top: 6px;
}
.kpi-badge.danger { background: var(--danger-soft); color: var(--danger); }
.kpi-badge.success { background: var(--success-soft); color: var(--success); }
.kpi-badge.warning { background: var(--warning-soft); color: var(--warning); }
.kpi-badge.info { background: var(--accent-soft); color: var(--accent); }

/* === CHART CARDS === */
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s;
}
.chart-card:hover { box-shadow: var(--shadow-md); }
.chart-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.chart-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.chart-wrap { position: relative; }

/* === GRID LAYOUTS === */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-2-1 { display: grid; grid-template-columns: 2fr 1fr; gap: 16px; }
.grid-1-2 { display: grid; grid-template-columns: 1fr 2fr; gap: 16px; }

/* === INSIGHT PANEL === */
.insight-panel {
  background: linear-gradient(135deg, #EEF1FF 0%, #F5F3FF 100%);
  border: 1px solid #D4D9F9;
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.insight-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .5px;
}
.insight-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.insight-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 6px;
  flex-shrink: 0;
}
.insight-text {
  font-size: 12px;
  color: #3B4A6B;
  line-height: 1.6;
}
.insight-text strong { color: var(--accent); }

/* === SEGMENT CARDS === */
.segment-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.segment-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all .2s;
  border-left: 4px solid var(--seg-color);
}
.segment-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.segment-card.selected {
  background: var(--accent-soft);
  border-color: var(--accent);
  border-left-color: var(--accent);
}
.seg-name { font-size: 12px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.seg-count { font-size: 22px; font-weight: 800; color: var(--seg-color); font-family: 'JetBrains Mono', monospace; }
.seg-label { font-size: 10px; color: var(--text-muted); margin-top: 2px; }
.seg-desc { font-size: 11px; color: var(--text-secondary); margin-top: 8px; line-height: 1.5; }

/* === TABLE === */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.data-table th {
  background: var(--surface2);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .5px;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}
.data-table tr:hover td { background: var(--surface2); }
.table-wrap {
  max-height: 360px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.risk-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 10px;
  font-weight: 600;
}
.risk-badge.high { background: var(--danger-soft); color: var(--danger); }
.risk-badge.medium { background: var(--warning-soft); color: var(--warning); }
.risk-badge.low { background: var(--success-soft); color: var(--success); }
.churn-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}
.churn-bar-track {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.churn-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--warning), var(--danger));
  border-radius: 2px;
  transition: width .5s;
}

/* === AUC DISPLAY === */
.auc-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.auc-ring {
  width: 120px; height: 120px;
  position: relative;
  margin-bottom: 12px;
}
.auc-ring svg { transform: rotate(-90deg); }
.auc-ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.auc-number {
  font-size: 24px;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -1px;
}
.auc-label { font-size: 10px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; }

/* === FEATURE IMPORTANCE === */
.feature-bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.feature-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.feature-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}
.feature-pct {
  font-size: 12px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
}
.feature-track {
  height: 8px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}
.feature-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--purple));
  transition: width 1s cubic-bezier(.4,0,.2,1);
}
.feature-insight {
  font-size: 11px;
  color: var(--text-muted);
}

/* === RECOMMENDATION CARDS === */
.rec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.rec-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: all .2s;
  border-top: 4px solid var(--rec-color);
}
.rec-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.rec-priority {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--rec-color);
  margin-bottom: 8px;
}
.rec-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.rec-body {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.rec-action {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--rec-color);
}

/* === SECTION ANCHOR === */
.section-anchor { scroll-margin-top: 80px; }

/* === DIVIDER === */
.divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

/* === TOOLTIP CUSTOM === */
.chart-tooltip {
  background: var(--text-primary) !important;
  color: #fff !important;
  border-radius: 8px !important;
  padding: 10px 14px !important;
  font-family: 'Inter', sans-serif !important;
  font-size: 12px !important;
  box-shadow: var(--shadow-lg) !important;
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* === SECTION SEPARATOR === */
.section-sep {
  border: none;
  border-top: 2px dashed var(--border);
  margin: 4px 0;
}

/* === EMPTY STATE === */
.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 13px;
}

/* === CHIP === */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface2);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.chip.active { background: var(--accent-soft); color: var(--accent); border-color: #C7D0F8; }

/* === HAMBURGER MENU BUTTON === */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background .15s;
  margin-right: 10px;
  flex-shrink: 0;
}
.hamburger-btn:hover { background: var(--surface2); }

/* === SIDEBAR OVERLAY (MOBILE) === */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 22, 36, .45);
  z-index: 99;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity .3s ease;
}
.sidebar-overlay.active {
  display: block;
  opacity: 1;
}

/* === INFO TOOLTIP === */
.info-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--surface2);
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 700;
  cursor: help;
  margin-left: 6px;
  flex-shrink: 0;
  border: 1px solid var(--border);
}
.info-tip .tip-text {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: #fff;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 400;
  line-height: 1.5;
  white-space: normal;
  width: 220px;
  text-align: left;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  transition: opacity .2s, visibility .2s;
  pointer-events: none;
}
.info-tip .tip-text::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--text-primary);
}
.info-tip:hover .tip-text { visibility: visible; opacity: 1; }

/* === PRINT STYLES === */
@media print {
  body { background: white; }
  .sidebar, .sidebar-overlay, .topbar, .hamburger-btn { display: none !important; }
  .main { margin-left: 0 !important; }
  .content { padding: 12px; }
  .chart-card, .kpi-card, .segment-card, .rec-card { break-inside: avoid; box-shadow: none; border: 1px solid #ddd; }
  .kpi-grid { grid-template-columns: repeat(3, 1fr); }
}

/* === RESPONSIVE: TABLET (<= 1200px) === */
@media (max-width: 1200px) {
  .topbar-title span { display: none; }
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    z-index: 200;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main {
    margin-left: 0;
  }
  .hamburger-btn {
    display: flex;
  }
  .kpi-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .topbar {
    padding: 0 16px;
  }
  .content {
    padding: 16px;
    gap: 16px;
  }
}

/* === RESPONSIVE: MOBILE (<= 768px) === */
@media (max-width: 768px) {
  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .grid-2, .grid-3, .grid-2-1, .grid-1-2 {
    grid-template-columns: 1fr;
  }
  .segment-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .rec-grid {
    grid-template-columns: 1fr;
  }
  .topbar {
    height: auto;
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 14px;
    gap: 8px;
  }
  .topbar-controls {
    width: 100%;
    flex-wrap: wrap;
  }
  .search-box input {
    width: 120px;
  }
  .filter-group {
    flex: 1;
    min-width: 0;
  }
  .filter-group select.filter-select {
    width: 100%;
  }
  .section-title {
    font-size: 14px;
  }
  .kpi-value {
    font-size: 22px;
  }
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .auc-display {
    padding: 16px;
  }
}

/* === RESPONSIVE: SMALL MOBILE (<= 480px) === */
@media (max-width: 480px) {
  .kpi-grid {
    grid-template-columns: 1fr;
  }
  .segment-grid {
    grid-template-columns: 1fr;
  }
  .kpi-value {
    font-size: 20px;
  }
  .topbar-title {
    font-size: 13px;
  }
  .content {
    padding: 12px;
    gap: 12px;
  }
}