:root{
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #1f4e79;
  --accent-2: #2a6f97;
  --shadow: 0 1px 2px rgba(0,0,0,0.05);
  --radius: 12px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  font-family: Poppins, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

svg{
  will-change: auto;
}

.card, .kpi-card{
  contain: layout style;
}

/* GPU acceleration for animated elements */
.loader-spinner {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Reduce paint complexity */
.grid {
  contain: layout;
}

/* Optimize scroll performance */
.panel--filters {
  contain: layout style;
}

/* Performance: Optimize chart rendering */
.card svg {
  shape-rendering: optimizeSpeed;
}

.card svg rect,
.card svg path {
  will-change: transform, opacity;
}

/* Performance: Reduce repaints during transitions */
.card svg .bar,
.card svg .heatmap-cell {
  contain: layout paint;
}

/* Performance: Optimize animations */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.loader-overlay{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease;
}

.loader-overlay.hidden{
  opacity: 0;
  pointer-events: none;
}

.loader-container{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.loader-spinner{
  width: 60px;
  height: 60px;
  border: 4px solid rgba(31, 78, 121, 0.1);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loader-title{
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin: 0;
  letter-spacing: 0.5px;
}

.loader-text{
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  min-height: 20px;
  font-weight: 500;
}

.topbar{
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246,247,249,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.topbar__inner{
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.search-bar{
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  max-width: 400px;
  margin: 0 12px;
}
.search-bar__input{
  width: 100%;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 12px;
  font-family: inherit;
}
.search-bar__input::placeholder{ color: var(--muted); }
.search-bar__input:focus{ outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px rgba(31, 78, 121, 0.1); }
.search-bar__btn-filter{ flex-shrink: 0; }

.brand{ display: flex; align-items: center; gap: 12px; }
.brand__text{ display: grid; gap: 4px; }
.app-logo{
  width: 120px;
  height: auto;
  border-radius: 0;
  border: none;
  box-shadow: none;
  display: block;
}

.app-title{
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.app-subtitle{
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--muted);
  max-width: 68ch;
  line-height: 1.35;
}

.topbar__meta{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.btn-icon{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
  font-family: inherit;
  cursor: pointer;
}
.btn-icon:hover{ background: #f0f2f5; }
.logout-btn svg{ width: 18px; height: 18px; }

.meta-pill{
  font-size: 12px;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  white-space: nowrap;
}

.meta-pill__value{ font-weight: 600; }

.layout{
  max-width: 1320px;
  margin: 0 auto;
  padding: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.panel{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel--filters .panel__section{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  align-items: start;
}
.panel--filters .panel__title{ margin: 0; font-size: 16px; color: var(--text); grid-column: 1 / -1; }
.panel--filters .panel__hint{ grid-column: 1 / -1; }
.panel--filters .form-row{ margin: 0; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 10px; box-shadow: var(--shadow); }
.panel--filters .form-row label{ margin: 0 0 4px; font-size: 12px; color: var(--muted); font-weight: 600; }
.panel--filters select,
.panel--filters input[type="date"],
.panel--filters input[type="number"]{ height: 36px; }
.panel--filters .form-actions{ grid-column: 1 / -1; justify-self: end; display: flex; gap: 8px; }
.panel--filters .form-actions .btn{ width: auto; padding: 8px 12px; }
.panel--filters #filter-date-from, .panel--filters #filter-date-to{ width: 100%; }
.panel--filters .form-row--inline{ display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.panel--filters .form-row--inline label{ grid-column: 1 / -1; }
.panel--filters .form-row--span2{ grid-column: span 2; }
.panel--filters .panel__divider, .panel--filters .panel__subtitle, .panel--filters .panel__text, .panel--filters .panel__list{ display: none; }

.panel--filters{
  transition: opacity 300ms ease, max-height 300ms ease, margin-bottom 300ms ease;
  max-height: 500px;
  overflow: hidden;
  margin-bottom: 16px;
  opacity: 1;
}
.panel--filters.hidden{
  display: block;
  max-height: 0;
  margin-bottom: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.panel__section{ padding: 14px 14px 16px; }
.panel__title{ margin: 0 0 6px; font-size: 16px; }
.panel__subtitle{ margin: 12px 0 6px; font-size: 13px; color: var(--text); }
.panel__hint{ margin: 0 0 12px; font-size: 12px; color: var(--muted); line-height: 1.4; }
.panel__text{ margin: 0 0 10px; font-size: 12px; color: var(--muted); line-height: 1.45; }

.panel__list{
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.panel__divider{ height: 1px; background: var(--border); margin: 14px -14px; }

.form-row{ display: grid; gap: 6px; margin-bottom: 10px; }
label{ font-size: 12px; color: var(--muted); }
select{
  width: 100%;
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13px;
}

input[type="date"]{
  width: 100%;
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13px;
}

input[type="email"], input[type="password"]{
  width: 100%;
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13px;
}
input[type="number"]{
  width: 100%;
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13px;
}
button, input, select, textarea{ font-family: inherit; }

.form-actions{ margin-top: 10px; }
.btn{
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}
.btn:hover{ background: var(--accent-2); }
.btn--secondary{
  width: auto;
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn--secondary:hover{ background: rgba(31, 78, 121, 0.05); }

.dashboard{ min-width: 0; }

/* Chart Category Sections */
.chart-category{
  margin-bottom: 32px;
}

.chart-category__header{
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.chart-category__icon{
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  flex-shrink: 0;
}

.chart-category__icon svg{
  width: 18px;
  height: 18px;
}

.chart-category__title{
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.chart-category__subtitle{
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.auth{ min-height: 100vh; display: grid; place-items: center; padding: 24px; background: var(--bg); }
.auth-card{ width: 480px; max-width: 92vw; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.auth-header{ display: flex; flex-direction: column; align-items: center; gap: 10px; margin-bottom: 16px; }
.auth-header .app-title{ margin: 0; font-size: 20px; color: var(--accent); text-align: center; }

.card{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-width: 0;
}

.card--wide{ grid-column: 1 / -1; }

.kpi-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.kpi-card{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.kpi-card:hover{
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.kpi-card__icon{
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.kpi-card__icon svg{
  width: 24px;
  height: 24px;
}

.kpi-card__content{
  flex: 1;
  min-width: 0;
}

.kpi-card__label{
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
  font-weight: 500;
}

.kpi-card__value{
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.card__header{ padding: 12px 14px; border-bottom: 1px solid var(--border); }
.card__title{ margin: 0; font-size: 14px; }
.card__subtitle{ margin: 4px 0 0; font-size: 12px; color: var(--muted); }

.card__body{ padding: 10px 12px 12px; }
.card__body--map{ padding: 0; display: block; position: relative; }

.viz{
  width: 680px;
  max-width: 100%;
  height: 320px;
}

.viz--wide{
  width: 100%;
  max-width: 100%;
  height: 360px;
}

.card__body{ display: flex; justify-content: center; }
.card__body--map{ display: block; }

/* D3 axis text tends to look a bit heavy by default */
.viz svg text{ font-family: Poppins, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial; }
.viz svg .x-axis text, .viz svg .y-axis text{ fill: #374151; font-size: 11px; }

.heatmap-cell{ transition: stroke 120ms ease, filter 120ms ease; }
.heatmap-cell:hover{ filter: brightness(1.03); }

.sankey-link{ transition: stroke 120ms ease, stroke-width 120ms ease; }

/* Parallel Coordinates */
.parallel-line{ transition: stroke-opacity 120ms ease, stroke-width 120ms ease; }

/* Box Plot */
.box-group rect.box{ transition: opacity 120ms ease; }
.box-group rect.box:hover{ opacity: 1 !important; }

/* Scatter Plot */
.point{ transition: r 120ms ease, opacity 120ms ease; }
.point:hover{ r: 7px !important; opacity: 1 !important; }

/* Histogram */
.bar{ transition: fill 120ms ease; }

/* Treemap */
.leaf{ transition: opacity 120ms ease; }

/* Radar Chart */
#chart-radar path{ transition: fill-opacity 120ms ease, stroke-opacity 120ms ease; }

.map{
  width: 100%;
  height: 500px;
}

/* Map Legend */
.map-legend{
  position: absolute;
  bottom: 25px;
  left: 12px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 10;
}
.map-legend__title{
  display: block;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text);
}
.map-legend__items{
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.map-legend__item{
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
}
.map-legend__dot{
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}
.map-legend__hint{
  display: block;
  margin-top: 5px;
  padding-top: 5px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 9px;
}

.footer{
  border-top: 1px solid var(--border);
  background: var(--panel);
}
.footer__inner{
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px 18px 20px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  display: grid;
  gap: 8px;
}
.footer__title{ font-weight: 700; color: var(--text); }
.footer__credits{ display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.footer__credits span{ display: flex; gap: 4px; }
.footer__credits a{ color: var(--accent); text-decoration: none; }
.footer__credits a:hover{ text-decoration: underline; }
.footer__copy{ color: var(--muted); }

.notes{
  font-size: 13px;
  color: var(--text);
  line-height: 1.55;
}

.tooltip{
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  opacity: 0;
  background: rgba(17, 24, 39, 0.92);
  color: #fff;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 12px;
  line-height: 1.3;
  transform: translate(-999px, -999px);
  max-width: 320px;
}

@media (max-width: 1100px){
  .layout{ grid-template-columns: 1fr; }
  .grid{ grid-template-columns: 1fr; }
  .map{ height: 340px; }
}