:root {
  --bg: #fafaf9;
  --surface: #ffffff;
  --border: #e7e5e4;
  --text: #1c1917;
  --text-muted: #78716c;
  --text-soft: #57534e;
  --accent: #15803d;
  --accent-soft: #dcfce7;
  --danger: #b45309;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --radius: 0.625rem;
}

/* Fluid root font: scales with viewport. */
/* 1366 px (iPad Pro 12.9" landscape) → ~16 px root. */
html {
  font-size: clamp(15px, 1.15vw, 18px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.container {
  max-width: min(75rem, 100%);
  margin: 0 auto;
  padding: clamp(1rem, 2.5vh, 1.75rem) clamp(1rem, 2vw, 1.75rem);
}

/* Calc pages fill the viewport, no scroll on landscape tablets. */
.page-calc {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.page-calc .container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ---------- Landing ---------- */

.page-landing .container {
  padding-top: clamp(2rem, 5vh, 3rem);
  padding-bottom: 6rem;
}
.hero {
  margin-bottom: 3rem;
}
.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 2.5vw + 0.5rem, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.lead {
  margin: 0;
  color: var(--text-soft);
  font-size: clamp(0.9375rem, 0.4vw + 0.75rem, 1.0625rem);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}
.card {
  position: relative;
  display: block;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}
.card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  border-color: #d6d3d1;
}
.card h2 {
  margin: 0 0 0.375rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.875rem;
}
.card-arrow {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  color: var(--text-muted);
}

/* ---------- Calc page ---------- */

.page-header {
  margin-bottom: clamp(1rem, 2vh, 1.5rem);
}
.back {
  display: inline-block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}
.back:hover { color: var(--text); }
.page-header h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(1.5rem, 1.8vw + 0.75rem, 2.125rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.page-header .lead {
  font-size: clamp(0.875rem, 0.4vw + 0.7rem, 1rem);
}

.calc-layout {
  display: grid;
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  gap: clamp(1rem, 1.5vw, 1.75rem);
  align-items: start;
}

/* Phone */
@media (max-width: 47rem) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
}

/* Inputs */
.inputs {
  display: flex;
  flex-direction: column;
  gap: clamp(0.875rem, 1.2vh, 1.25rem);
  padding: clamp(1rem, 1.5vw, 1.5rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.mode-toggle {
  display: flex;
  padding: 0.25rem;
  background: #f5f5f4;
  border-radius: 0.5rem;
  gap: 0.125rem;
}
.mode-btn {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 0;
  background: transparent;
  border-radius: 0.375rem;
  color: var(--text-soft);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}
.mode-btn:hover {
  color: var(--text);
}
.mode-btn.is-active {
  background: #fff;
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.mode-fields {
  display: flex;
  flex-direction: column;
  gap: clamp(0.875rem, 1.2vh, 1.25rem);
}
.mode-fields[hidden] { display: none; }

.field { display: flex; flex-direction: column; gap: 0.375rem; }
.field label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
}
.field input[type="number"],
.field input[type="text"] {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  outline: none;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.field input[type="number"]:focus,
.field input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field .hint {
  margin: 0.125rem 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.label-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}
.slider-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* Slider */
.slider {
  --fill-norm: 0.4;
  --thumb-size: 1.25rem;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 0.375rem;
  margin: 0.5rem 0;
  padding: 0;
  background: linear-gradient(
    to right,
    var(--accent) 0,
    var(--accent)
      calc(var(--thumb-size) / 2 + (100% - var(--thumb-size)) * var(--fill-norm)),
    var(--border)
      calc(var(--thumb-size) / 2 + (100% - var(--thumb-size)) * var(--fill-norm)),
    var(--border) 100%
  );
  border-radius: 999px;
  outline: none;
  cursor: pointer;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: var(--thumb-size);
  height: var(--thumb-size);
  background: var(--accent);
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  cursor: grab;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.slider::-webkit-slider-thumb:hover {
  transform: scale(1.08);
}
.slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.12);
  box-shadow: 0 0 0 6px var(--accent-soft), 0 1px 3px rgba(0, 0, 0, 0.2);
}
.slider::-moz-range-thumb {
  width: var(--thumb-size);
  height: var(--thumb-size);
  background: var(--accent);
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  cursor: grab;
}
.slider:focus { outline: none; }
.slider:focus::-webkit-slider-thumb {
  box-shadow: 0 0 0 6px var(--accent-soft), 0 1px 3px rgba(0, 0, 0, 0.2);
}
.slider:focus::-moz-range-thumb {
  box-shadow: 0 0 0 6px var(--accent-soft), 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Stepper */
.stepper {
  display: grid;
  grid-template-columns: 2.75rem 1fr 2.75rem;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}
.stepper-btn {
  width: 2.75rem;
  height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease,
    transform 0.12s ease;
  font-family: inherit;
  line-height: 1;
}
.stepper-btn:hover:not(:disabled) {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.stepper-btn:active:not(:disabled) {
  transform: scale(0.96);
}
.stepper-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
  border-color: var(--accent);
}
.stepper-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.stepper-value {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.125rem;
  text-align: center;
}
.stepper-count {
  font-size: clamp(1.5rem, 2vw + 0.5rem, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stepper-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.input-suffix {
  position: relative;
}
.input-suffix input { padding-right: 2.25rem; }
.input-suffix .suffix {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.875rem;
  pointer-events: none;
}

/* Hide number input spinners */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] { -moz-appearance: textfield; }

/* Results */
.results {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.result-block {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(1.25rem, 1.75vw, 1.75rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.result-block h2 {
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.kv {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem 1rem;
  margin: 0;
}
.kv dt {
  font-size: 0.875rem;
  color: var(--text-soft);
}
.kv dd {
  margin: 0;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--text);
}
.kv dt.emphasis, .kv dd.emphasis {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  margin-top: 0.25rem;
}

.result-highlight {
  background: linear-gradient(180deg, #f0fdf4 0%, var(--surface) 100%);
  border-color: #bbf7d0;
}
.big-number {
  margin: 0 0 0.25rem;
  font-size: clamp(2rem, 3.2vw + 0.5rem, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  line-height: 1.05;
}
.big-number--neutral {
  color: var(--text);
}
.big-number-suffix {
  display: inline-block;
  margin-left: 0.5rem;
  font-size: clamp(0.875rem, 0.4vw + 0.7rem, 1.0625rem);
  font-weight: 500;
  letter-spacing: 0;
  color: var(--text-muted);
  vertical-align: middle;
}
.result-block > .hint {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-soft);
}

.footnote-inline {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.placeholder {
  padding: 2rem;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  text-align: center;
}

/* Language switcher (fixed top-right on every page) */
.lang-switcher {
  position: fixed;
  top: clamp(0.75rem, 1.5vh, 1.25rem);
  right: clamp(0.75rem, 1.5vw, 1.25rem);
  z-index: 50;
  display: flex;
  padding: 0.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  box-shadow: var(--shadow-sm);
  gap: 0.125rem;
}
.lang-btn {
  min-width: 2.5rem;
  padding: 0.375rem 0.625rem;
  border: 0;
  background: transparent;
  border-radius: 0.375rem;
  color: var(--text-soft);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}
.lang-btn:hover { color: var(--text); }
.lang-btn.is-active {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

/* Tablet landscape & desktop:
   - 2 result-blocks (gutschein): top-align, cards equal each other via inner grid
   - 1 result-block (kalender): card stretches to inputs height */
@media (min-width: 60rem) and (orientation: landscape) {
  .calc-layout {
    align-items: start;
  }
  .results:has(.result-block + .result-block) {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: stretch;
  }
  .calc-layout:not(:has(.result-block + .result-block)) {
    align-items: stretch;
  }
  .calc-layout:not(:has(.result-block + .result-block)) .result-block {
    flex: 1;
  }
}