/* ===== CSS custom properties ===== */
:root {
  --bg:          #0d1117;
  --bg-card:     rgba(22, 30, 43, 0.85);
  --bg-card-2:   rgba(30, 40, 58, 0.7);
  --border:      rgba(255, 255, 255, 0.08);
  --text:        #e6edf3;
  --text-muted:  #8b949e;
  --text-hint:   #6e7681;

  --buy:         #f59e0b;   /* amber */
  --buy-glow:    rgba(245, 158, 11, 0.18);
  --buy-muted:   rgba(245, 158, 11, 0.35);

  --rent:        #2dd4bf;   /* teal */
  --rent-glow:   rgba(45, 212, 191, 0.18);
  --rent-muted:  rgba(45, 212, 191, 0.35);

  --green:       #3fb950;
  --radius:      14px;
  --font:        'Inter', system-ui, sans-serif;
}

/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, #161b27 0%, #0d1117 100%);
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.header-inner { max-width: 900px; margin: 0 auto; }

h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--buy) 0%, var(--rent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  margin-top: 0.4rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ===== Main layout ===== */
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ===== Card ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  backdrop-filter: blur(12px);
}

/* ===== Shared inputs ===== */
.inputs-shared {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem 2rem;
}

/* ===== Two-column inputs ===== */
.inputs-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 700px) {
  .inputs-columns { grid-template-columns: 1fr; }
}

.col-header {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid;
}

.buy-header  { color: var(--buy);  border-color: var(--buy); }
.rent-header { color: var(--rent); border-color: var(--rent); }

/* ===== Input group ===== */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1.1rem;
}

.input-group:last-child { margin-bottom: 0; }

label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.hint {
  font-size: 0.72rem;
  color: var(--text-hint);
  font-weight: 400;
}

/* ===== Slider row ===== */
.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slider-row input[type="range"] {
  flex: 1;
  min-width: 0;
}

/* ===== Number + unit ===== */
.num-unit {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.num-unit input[type="number"] {
  width: 72px;
  padding: 0.3rem 0.5rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  text-align: right;
  transition: border-color 0.15s;
}

.num-unit input[type="number"]:focus {
  outline: none;
  border-color: rgba(255,255,255,0.25);
}

.unit {
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ===== Euro prefix input ===== */
.euro-input {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 0.3rem 0.5rem;
  width: fit-content;
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.euro-input input[type="number"] {
  width: 110px;
  background: transparent;
  border: none;
  padding: 0;
}

.euro-input input[type="number"]:focus { outline: none; }

.unit.prefix { color: var(--text-muted); }

/* ===== Toggle switch ===== */
.toggle-group {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.toggle-label {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
}

.toggle-switch { cursor: pointer; flex-shrink: 0; }
.toggle-switch input { display: none; }

.toggle-track {
  display: block;
  width: 40px;
  height: 22px;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  position: relative;
  transition: background 0.2s;
}

.toggle-thumb {
  position: absolute;
  top: 3px; left: 3px;
  width: 16px; height: 16px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle-switch input:checked + .toggle-track { background: var(--buy-muted); }
.toggle-switch input:checked + .toggle-track .toggle-thumb {
  transform: translateX(18px);
  background: var(--buy);
}

/* ===== Range slider styling ===== */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255,255,255,0.12);
  border-radius: 99px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.2);
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--text);
  border: 2px solid var(--bg);
  cursor: pointer;
}

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

/* ===== Info box ===== */
.info-box {
  background: rgba(255,255,255,0.04);
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  font-size: 0.8rem;
  color: var(--text-hint);
  line-height: 1.6;
  margin-top: 1rem;
}

/* ===== Results ===== */
.results { display: flex; flex-direction: column; gap: 0.75rem; }

.result-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 600px) {
  .result-cards { grid-template-columns: 1fr; }
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: box-shadow 0.2s;
  backdrop-filter: blur(12px);
}

.buy-card  { border-top: 3px solid var(--buy);  }
.rent-card { border-top: 3px solid var(--rent); }
.breakeven-card { border-top: 3px solid var(--text-hint); }

.result-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.result-value {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: color 0.2s;
}

.buy-card  .result-value { color: var(--buy); }
.rent-card .result-value { color: var(--rent); }

.result-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.winner-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.6rem;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.winner-buy  { background: var(--buy-muted);  color: var(--buy);  }
.winner-rent { background: var(--rent-muted); color: var(--rent); }

.monthly-payment-note {
  font-size: 0.83rem;
  color: var(--text-hint);
  padding-left: 0.25rem;
}

/* ===== Charts ===== */
.chart-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.chart-legend {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
}

.buy-dot  { background: var(--buy); }
.rent-dot { background: var(--rent); }

.chart-wrap {
  position: relative;
  height: 300px;
}

/* ===== Table ===== */
.table-section { overflow: hidden; }

.table-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.88rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0;
  transition: color 0.15s;
}

.table-toggle:hover { color: var(--text); }

.toggle-icon {
  display: inline-block;
  transition: transform 0.2s;
  font-size: 0.7rem;
}

.table-toggle[aria-expanded="true"] .toggle-icon { transform: rotate(90deg); }

.table-wrap {
  margin-top: 1.25rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  padding: 0.6rem 1rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th:first-child, td:first-child { text-align: left; }

th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

tbody tr:hover { background: rgba(255,255,255,0.03); }

td.has-tip { cursor: default; border-bottom-style: dashed; }

tr.winner-row td { font-weight: 600; }

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-hint);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}