/* ====== Design Tokens ====== */
:root {
  /* Palette: deep navy + parchment + muted gold accent — fiskalisch/seriös */
  --bg:           #F5F2EA;
  --surface:      #FBFAF6;
  --surface-2:   #EFEBE0;
  --border:       #D9D3C2;
  --border-strong:#B8B09A;
  --text:         #14222B;
  --text-muted:   #5C6973;
  --text-faint:   #8B95A0;
  --navy:         #0C2E3A;
  --navy-2:       #163E4D;
  --rate:         #8C2F22;   /* terracotta — Steuersatz */
  --rate-tint:    #F1D9D2;
  --marginal:     #6E522B;   /* brown/gold — Grenzsteuersatz */
  --marginal-tint:#E6D9C0;
  --cum:          #0C2E3A;   /* deep navy — kumulatives Aufkommen */
  --cum-tint:     #C7CFD4;
  --accent:       #B58A2A;   /* gold accent */
  --marker:       #0C2E3A;
  --dim-opacity:  0.12;

  --radius:       4px;
  --radius-lg:    8px;
  --shadow-sm:    0 1px 0 rgba(20,34,43,0.04), 0 1px 2px rgba(20,34,43,0.04);
  --shadow-md:    0 2px 8px rgba(20,34,43,0.06), 0 1px 2px rgba(20,34,43,0.04);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--navy); text-decoration: none; border-bottom: 1px solid var(--border-strong); }
a:hover { color: var(--rate); border-bottom-color: var(--rate); }

/* ====== Layout shell ====== */
.app {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 28px 56px;
}

@media (max-width: 720px) {
  .app { padding: 20px 16px 40px; }
  body { font-size: 14px; }
  #slider-value-display { font-size: 19px; }
  #income-input { width: 110px; }
}

/* ====== Header ====== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo { width: 40px; height: 40px; flex-shrink: 0; }
.brand-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  line-height: 1.2;
}
.brand-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}
.header-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  background: var(--navy);
  color: var(--surface);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  font-variant-numeric: tabular-nums;
}
.badge-muted {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-strong);
}

/* ====== Controls ====== */
.quick-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
}
.quick-guide h1,
.quick-guide h2 {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text);
}
.quick-guide p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13.5px;
  line-height: 1.45;
}
.quick-guide .quick-note {
  margin-top: 8px;
  color: var(--text);
  font-weight: 600;
}
@media (max-width: 760px) {
  .quick-guide { grid-template-columns: 1fr; }
}

.controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.control-row {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: end;
}
@media (max-width: 900px) {
  .control-row { grid-template-columns: 1fr; gap: 20px; }
}
.control-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  letter-spacing: 0.01em;
}
.control-hint {
  display: block;
  font-weight: 400;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
.control-foot {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}
.control-foot.unavailable { color: var(--rate); }

/* Slider */
.slider-wrap { display: flex; flex-direction: column; gap: 12px; }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: linear-gradient(to right, var(--navy) 0%, var(--navy) var(--slider-pct, 50%), var(--border) var(--slider-pct, 50%), var(--border) 100%);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px; height: 20px;
  background: var(--surface);
  border: 2px solid var(--navy);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  transition: transform .12s ease;
}
input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.1); }
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px;
  background: var(--surface);
  border: 2px solid var(--navy);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
input[type="range"]:focus-visible { box-shadow: 0 0 0 3px rgba(12,46,58,0.18); }

.slider-value {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
#slider-value-display {
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font-sans);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.015em;
}
#income-input {
  margin-left: auto;
  width: 140px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
}
#income-input:focus { outline: 2px solid var(--navy); outline-offset: -1px; }

/* Select */
select {
  width: 100%;
  padding: 9px 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23556' d='M6 8 0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}
select:focus { outline: 2px solid var(--navy); outline-offset: -1px; }

/* ====== KPIs ====== */
.kpis {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
@media (max-width: 1180px) { .kpis { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .kpis { grid-template-columns: repeat(2, 1fr); } }
.kpi {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
}
.kpi-accent {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--surface);
}
.kpi-accent .kpi-label, .kpi-accent .kpi-foot { color: rgba(251,250,246,0.7); }
.kpi-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.kpi-value {
  font-size: 22px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: inherit;
  line-height: 1.15;
}
.kpi-foot {
  margin-top: 4px;
  font-size: 11px;
  color: var(--text-faint);
}
.kpi-accent .kpi-value { color: var(--surface); }

.model-disclaimer {
  margin: -12px 0 20px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: rgba(181, 138, 42, 0.08);
  color: var(--text-muted);
  font-size: 12.5px;
  line-height: 1.4;
}

/* ====== Chart ====== */
.chart-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}
.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.chart-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0;
  color: var(--text);
  letter-spacing: -0.005em;
}
.legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-muted);
}
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 14px; height: 3px; border-radius: 1px; display: inline-block; }
.swatch-rate { background: var(--rate); }
.swatch-marginal { background: var(--marginal); }
.swatch-cum { background: var(--cum); }
.swatch-marker { background: var(--accent); width: 2px; height: 12px; }

.chart {
  width: 100%;
  position: relative;
  min-height: 380px;
}
@media (max-width: 720px) { .chart { min-height: 320px; } }

.chart-wrap {
  position: relative;
  --plot-left: 64px;
  --plot-right: 64px;
  --axis-y: 340px;
}

.chart svg { display: block; width: 100%; height: auto; overflow: visible; }

.chart-axis-slider {
  position: absolute;
  z-index: 5;
  left: var(--plot-left);
  right: auto;
  top: calc(var(--axis-y) - 3px);
  width: var(--plot-width);
  height: 6px;
  margin: 0;
  background: linear-gradient(to right, var(--navy) 0%, var(--navy) var(--slider-pct, 50%), rgba(12,46,58,0.22) var(--slider-pct, 50%), rgba(12,46,58,0.22) 100%);
}
.chart-axis-slider::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  background: var(--surface);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(181,138,42,0.18), 0 1px 4px rgba(0,0,0,0.18);
}
.chart-axis-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: var(--surface);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(181,138,42,0.18), 0 1px 4px rgba(0,0,0,0.18);
}

.chart .axis path,
.chart .axis line { stroke: var(--border); shape-rendering: crispEdges; }
.chart .axis text {
  font-family: var(--font-sans);
  font-size: 11px;
  fill: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.chart .axis-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  fill: var(--text);
}
.chart .axis-title-right-top {
  font-size: 10px;
  letter-spacing: 0.02em;
}
.chart .axis-title-cum { fill: var(--cum); }
.chart .axis-title-rate { fill: var(--rate); }
.chart .axis-title-marginal { fill: var(--marginal); }
.chart .y-axis-left text { fill: var(--cum); }
.chart .y-axis-right text { fill: var(--rate); }
.chart .y-axis-marginal text { fill: var(--marginal); }
.chart .y-axis-left path,
.chart .y-axis-left line { stroke: rgba(12, 46, 58, 0.38); }
.chart .y-axis-right path,
.chart .y-axis-right line { stroke: rgba(140, 47, 34, 0.38); }
.chart .y-axis-marginal path,
.chart .y-axis-marginal line { stroke: rgba(110, 82, 43, 0.42); }
.chart .grid line { stroke: var(--border); stroke-dasharray: 2 3; opacity: 0.6; }
.chart .grid path { display: none; }

.chart .line-rate {
  fill: none;
  stroke: var(--rate);
  stroke-width: 2.3;
  opacity: 1;
}
.chart .line-cum {
  fill: none;
  stroke: var(--cum);
  stroke-width: 2.3;
  opacity: 1;
}
.chart .line-marginal {
  fill: none;
  stroke: var(--marginal);
  stroke-width: 2.1;
  opacity: 1;
}
.chart .area-rate {
  fill: var(--rate);
  opacity: 0.08;
}
.chart .dimmed { opacity: 0.34; }
.chart .marker-line {
  stroke: var(--accent);
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
}
.chart .marker-dot {
  stroke: var(--surface);
  stroke-width: 1.5;
}
.chart .marker-dot.rate { fill: var(--rate); }
.chart .marker-dot.cum { fill: var(--cum); }
.chart .marker-dot.marginal { fill: var(--marginal); }

.chart .axis-value-dot {
  stroke: var(--surface);
  stroke-width: 1.7;
}
.chart .axis-value-dot-cum { fill: var(--cum); }
.chart .axis-value-dot-rate { fill: var(--rate); }
.chart .axis-value-dot-marginal { fill: var(--marginal); }
.chart .axis-value-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  paint-order: stroke;
  stroke: var(--surface);
  stroke-width: 4px;
  stroke-linejoin: round;
  font-variant-numeric: tabular-nums;
}
.chart .axis-value-label-cum { fill: var(--cum); }
.chart .axis-value-label-rate { fill: var(--rate); }
.chart .axis-value-label-marginal { fill: var(--marginal); }

.chart .marker-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  fill: var(--text);
  font-variant-numeric: tabular-nums;
}
.chart .marker-label-bg { fill: var(--surface); stroke: var(--border-strong); }

.chart-foot {
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ====== Info Cards ====== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}
@media (max-width: 1000px) { .info-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 700px)  { .info-grid { grid-template-columns: 1fr; } }
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}
.info-card h3 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 12px;
}
.info-card p { font-size: 13.5px; margin: 0 0 10px; color: var(--text); }
.info-card p:last-child { margin-bottom: 0; }
.info-card em { font-style: italic; color: var(--text); }
.info-note { font-size: 12.5px; color: var(--text-muted); }
.info-list { margin: 0; padding-left: 18px; }
.info-list li { font-size: 13px; margin-bottom: 6px; color: var(--text); }
.info-list li:last-child { margin-bottom: 0; }

/* ====== Footer ====== */
.footer {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.footer-sep { margin: 0 8px; color: var(--text-faint); }

/* ====== Print ====== */
@media print {
  body { background: #fff; }
  .controls, input[type="range"] { display: none; }
}