:root {
  --color-state: #c0392b;
  --color-regulation: #e67e22;
  --color-bank: #7f5af0;
  --color-house: #2a9d8f;
  --color-text: #1a1a1a;
  --color-muted: #6b6b6b;
  --color-bg: #fafbfc;
  --color-card: #ffffff;
  --color-border: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --radius: 12px;
  --max-width: 1100px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* Language switcher */
.lang-switcher {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 4px;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}
.lang-switcher button {
  background: transparent;
  border: none;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
}
.lang-switcher button:hover {
  background: rgba(0,0,0,0.04);
}
.lang-switcher button.active {
  background: var(--color-text);
  color: #fff;
}

/* Pozadí — dům + zahrada */
.bg-illustration {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
}
.bg-illustration svg {
  width: 100%;
  height: 100%;
  display: block;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px 120px;
}

section {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 48px 40px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

h1, h2, h3 {
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1.15;
}

h1 { font-size: clamp(28px, 4vw, 44px); }
h2 { font-size: clamp(22px, 2.5vw, 30px); margin-bottom: 8px; }

p { margin: 0 0 16px; }
.section-lede { color: var(--color-muted); margin-bottom: 32px; }

/* HERO */
.hero {
  text-align: center;
  padding: 72px 40px;
  background: linear-gradient(180deg, rgba(255,255,255,0.96) 0%, rgba(255,255,255,0.92) 100%);
  backdrop-filter: blur(2px);
}
.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
  font-weight: 600;
  margin-bottom: 24px;
}
.hero h1 {
  max-width: 880px;
  margin: 0 auto 24px;
}
.hero-lede {
  font-size: clamp(17px, 1.6vw, 21px);
  color: var(--color-text);
  max-width: 720px;
  margin: 0 auto 48px;
}
.highlight {
  background: linear-gradient(180deg, transparent 60%, #fff3a8 60%);
  padding: 0 4px;
  font-weight: 700;
}
.highlight-state {
  color: var(--color-state);
  font-weight: 800;
}
.highlight-house {
  color: var(--color-house);
  font-weight: 800;
}
em {
  font-style: italic;
  font-weight: 600;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  max-width: 960px;
  margin: 0 auto;
}
.stat {
  padding: 24px 16px;
  border-radius: var(--radius);
  border: 2px solid var(--color-border);
  background: #fff;
}
.stat-state { border-color: var(--color-state); }
.stat-regulation { border-color: var(--color-regulation); }
.stat-bank { border-color: var(--color-bank); }
.stat-house { border-color: var(--color-house); }
.stat-value {
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-state .stat-value { color: var(--color-state); }
.stat-regulation .stat-value { color: var(--color-regulation); }
.stat-bank .stat-value { color: var(--color-bank); }
.stat-house .stat-value { color: var(--color-house); }
.stat-label {
  margin-top: 8px;
  font-weight: 600;
  font-size: 16px;
}
.stat-sub {
  margin-top: 4px;
  font-size: 13px;
  color: var(--color-muted);
}

/* INPUTS */
.inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}
.inputs-grid label {
  display: block;
}
.input-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--color-text);
}
.input-label output {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--color-state);
}
input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: #e5e7eb;
  border-radius: 3px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  background: var(--color-state);
  border: 3px solid #fff;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: var(--color-state);
  border: 3px solid #fff;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.input-help {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.4;
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}
.quick-facts > div {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
}
.qf-label {
  font-size: 12px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.qf-value {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
}

/* SANKEY */
#sankey {
  width: 100%;
  display: block;
  margin-top: 16px;
}
.legend {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.legend-item {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
}
.legend-item::before {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  margin-right: 6px;
}
.legend-state::before { background: var(--color-state); }
.legend-regulation::before { background: var(--color-regulation); }
.legend-bank::before { background: var(--color-bank); }
.legend-house::before { background: var(--color-house); }

/* RECEIPT */
#receipt {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
#receipt th, #receipt td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
}
#receipt th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  font-weight: 600;
}
#receipt .amount {
  text-align: right;
  font-weight: 600;
}
.receipt-row td:first-child {
  border-left: 4px solid transparent;
  padding-left: 12px;
}
.receipt-state td:first-child { border-left-color: var(--color-state); }
.receipt-regulation td:first-child { border-left-color: var(--color-regulation); }
.receipt-bank td:first-child { border-left-color: var(--color-bank); }
.receipt-house td:first-child { border-left-color: var(--color-house); }

#receipt tfoot td {
  font-weight: 700;
  border-top: 2px solid var(--color-text);
}
#receipt .total-row td {
  font-size: 18px;
  background: #f5f5f5;
}
#receipt .summary-state td { color: var(--color-state); }
#receipt .summary-regulation td { color: var(--color-regulation); }
#receipt .summary-bank td { color: var(--color-bank); }
#receipt .summary-house td { color: var(--color-house); }
#receipt .summary-state td:first-child,
#receipt .summary-regulation td:first-child,
#receipt .summary-bank td:first-child,
#receipt .summary-house td:first-child {
  padding-left: 32px;
  font-weight: 600;
}

/* ALTERNATIVES */
.alternatives-section {
  background: linear-gradient(180deg, #fff7ed 0%, #fff 60%);
}
.alternatives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 32px;
}
.alt-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.alt-icon {
  font-size: 32px;
  margin-bottom: 12px;
}
.alt-big {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-state);
  letter-spacing: -0.02em;
  line-height: 1;
}
.alt-unit {
  margin-top: 4px;
  font-weight: 600;
  font-size: 15px;
}
.alt-sub {
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-muted);
}

/* METHODOLOGY */
.methodology ul {
  margin: 0;
  padding-left: 22px;
}
.methodology li {
  margin-bottom: 10px;
  color: var(--color-muted);
  font-size: 15px;
}
.methodology strong { color: var(--color-text); }

/* FOOTER */
footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 13px;
  padding: 32px 20px;
}

/* MOBILE */
@media (max-width: 980px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  main { padding: 32px 16px 80px; }
  section { padding: 28px 20px; }
  .hero { padding: 40px 20px; }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  #receipt th, #receipt td {
    padding: 10px 8px;
    font-size: 14px;
  }
}

/* PRINT */
@media print {
  .bg-illustration,
  .lang-switcher { display: none; }
  body { background: #fff; }
  section { box-shadow: none; border: 1px solid #ddd; page-break-inside: avoid; }
  .inputs,
  .sankey-section { display: none; } /* sankey nedává smysl na papíře — receipt to pokryje */
  a { color: var(--color-text); text-decoration: underline; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 10px; color: #666; }
}