/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f6f7f6;
  --surface: #ffffff;
  --surface-2: #f0f2f1;
  --ink: #16211f;
  --ink-soft: #566461;
  --line: #e0e4e2;
  --accent: #0d9488;
  --accent-ink: #0b5c54;
  --accent-soft: #d5efec;
  --capital: #0d9488;
  --interes: #e8933a;
  --scenario-b: #6366f1;
  --danger: #c2410c;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(16, 33, 31, .05), 0 12px 32px -12px rgba(16, 33, 31, .12);
  --wrap: 940px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Manrope", var(--sans);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1413;
    --surface: #141c1b;
    --surface-2: #1c2625;
    --ink: #e8efed;
    --ink-soft: #9aa8a5;
    --line: #29332f;
    --accent: #2dd4bf;
    --accent-ink: #7fe9dc;
    --accent-soft: #123330;
    --capital: #2dd4bf;
    --interes: #f0a95c;
    --scenario-b: #a5b4fc;
    --danger: #fb923c;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 40px -16px rgba(0, 0, 0, .6);
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3 { font-family: var(--display); line-height: 1.15; letter-spacing: -0.02em; text-wrap: balance; }
input { font: inherit; }

::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* =============================================================
   3. Utilities
   ============================================================= */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 20px; }

.skip-link {
  position: fixed; top: -100px; left: 16px; z-index: 999;
  padding: .6rem 1rem; background: var(--surface); color: var(--ink);
  border-radius: 8px; font-weight: 600; box-shadow: var(--shadow);
}
.skip-link:focus { top: 16px; }

/* =============================================================
   4. Header / footer
   ============================================================= */
.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 14px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--accent); }
.brand__mark { flex: none; }
.brand__name { font-family: var(--display); font-weight: 800; font-size: 1.15rem; color: var(--ink); letter-spacing: -0.02em; }
.site-nav a { font-weight: 500; color: var(--ink-soft); padding: 8px 4px; }
.site-nav a:hover { color: var(--accent); }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: 56px; }
.site-footer__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 20px; padding-block: 24px; font-size: .9rem; color: var(--ink-soft); }
.site-footer nav { display: flex; gap: 18px; }
.site-footer nav a:hover { color: var(--accent); }

/* =============================================================
   5. Hero
   ============================================================= */
.hero { padding-block: 34px 20px; }
.hero h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); font-weight: 800; }
.hero__sub { margin-top: 10px; max-width: 62ch; color: var(--ink-soft); font-size: 1.05rem; }

/* =============================================================
   6. Tool card
   ============================================================= */
.tool-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(18px, 4vw, 30px);
}

.calc-form { display: grid; gap: 18px; }
.scenario { display: grid; gap: 18px; }
@media (min-width: 720px) {
  .scenario { grid-template-columns: repeat(3, 1fr); gap: 22px; }
}

.field { display: grid; gap: 8px; }
.field > label { font-weight: 600; font-size: .95rem; }
.field__row { display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface-2); padding: 4px 12px; transition: border-color .15s var(--ease-out); }
.field__row:focus-within { border-color: var(--accent); }
.field__row input { flex: 1; width: 100%; border: 0; background: none; padding: 10px 0; font-size: 1.05rem; font-variant-numeric: tabular-nums; color: var(--ink); -moz-appearance: textfield; }
.field__row input::-webkit-outer-spin-button,
.field__row input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field__unit { color: var(--ink-soft); font-size: .95rem; flex: none; }
.field__hint { font-size: .82rem; color: var(--ink-soft); }
.field__row.is-invalid { border-color: var(--danger); }
.field__hint.is-invalid { color: var(--danger); }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 4px;
  background: var(--line); cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface);
  box-shadow: 0 1px 4px rgba(0,0,0,.25);
}
input[type="range"]::-moz-range-thumb {
  width: 17px; height: 17px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface);
}

.compare-toggle { display: inline-flex; align-items: center; gap: 9px; font-weight: 500; font-size: .95rem; color: var(--ink-soft); cursor: pointer; }
.compare-toggle input { width: 17px; height: 17px; accent-color: var(--accent); }

.scenario--b {
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  padding: 16px;
  background: var(--surface-2);
}

/* --- Results --- */
.results { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--line); }
.result-grid { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .result-grid { grid-template-columns: repeat(3, 1fr); } }

.result {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: grid; gap: 3px;
}
.result--main { background: var(--accent-soft); border-color: transparent; }
.result__label { font-size: .82rem; color: var(--ink-soft); font-weight: 500; }
.result__value { font-family: var(--display); font-weight: 800; font-size: clamp(1.4rem, 4vw, 1.9rem); font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.result--main .result__value { color: var(--accent-ink); }
.result__note { font-size: .82rem; color: var(--scenario-b); font-weight: 600; font-variant-numeric: tabular-nums; }
.results__diff { margin-top: 12px; font-size: .92rem; color: var(--ink-soft); }
.results__diff strong { color: var(--ink); }

.chart { margin-top: 22px; }
.chart canvas { width: 100%; height: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); }
.chart__legend { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: .84rem; color: var(--ink-soft); align-items: center; }
.dot { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }
.dot--capital { background: var(--capital); }
.dot--interes { background: var(--interes); }
.dot--b { background: var(--scenario-b); }

.results__actions { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 18px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: .95rem; transition: background .15s var(--ease-out), border-color .15s var(--ease-out);
}
.btn--ghost { border: 1px solid var(--line); background: var(--surface-2); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--link { color: var(--ink-soft); }
.btn--link:hover { color: var(--accent); }

/* --- Amortization table --- */
.tabla-wrap { margin-top: 18px; overflow-x: auto; }
.tabla { width: 100%; border-collapse: collapse; font-size: .88rem; font-variant-numeric: tabular-nums; }
.tabla th, .tabla td { padding: 8px 12px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tabla th:first-child, .tabla td:first-child { text-align: left; }
.tabla thead th { position: sticky; top: 0; background: var(--surface); color: var(--ink-soft); font-weight: 600; }
.tabla tbody tr:nth-child(even) { background: var(--surface-2); }
#tabla-more { margin-top: 12px; }

/* --- State handling --- */
.needs-js { display: none; color: var(--ink-soft); font-size: .95rem; }
.no-js .results { display: none; }
.no-js .calc-form { display: none; }
.no-js .needs-js { display: block; }

/* =============================================================
   7. Below-the-fold content
   ============================================================= */
.privacy-badge { margin-top: 16px; font-size: .92rem; color: var(--ink-soft); }
.disclaimer { margin-top: 6px; font-size: .84rem; color: var(--ink-soft); }

.ad-wrap { margin-top: 28px; }
.ad-slot {
  min-height: 120px;
  display: flex; align-items: center; justify-content: center;
  border: 1px dashed var(--line); border-radius: var(--radius-sm);
  color: var(--ink-soft); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase;
  background: repeating-linear-gradient(45deg, transparent, transparent 12px, var(--surface-2) 12px, var(--surface-2) 24px);
}

.prose { margin-top: 40px; }
.prose h2 { font-size: clamp(1.3rem, 3.5vw, 1.6rem); font-weight: 700; margin-top: 34px; margin-bottom: 12px; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin-bottom: 12px; color: var(--ink-soft); }
.prose code { background: var(--surface-2); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; font-size: .9em; color: var(--ink); }

.steps { list-style: none; display: grid; gap: 14px; margin-top: 8px; }
@media (min-width: 720px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li { display: grid; grid-template-columns: 26px 1fr; gap: 12px; align-items: start; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px; font-size: .92rem; color: var(--ink-soft); }
.steps li strong { color: var(--ink); }
.steps svg { width: 26px; height: 26px; color: var(--accent); }

.prose details { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 4px 16px; margin-bottom: 10px; background: var(--surface); }
.prose details summary { cursor: pointer; font-weight: 600; padding: 12px 0; list-style: none; color: var(--ink); }
.prose details summary::-webkit-details-marker { display: none; }
.prose details summary::after { content: "+"; float: right; color: var(--accent); font-weight: 700; }
.prose details[open] summary::after { content: "–"; }
.prose details p { padding-bottom: 12px; margin-bottom: 0; }

.tools-grid { display: grid; gap: 14px; }
@media (min-width: 640px) { .tools-grid { grid-template-columns: repeat(3, 1fr); } }
.tool-link { display: grid; gap: 4px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); transition: border-color .15s var(--ease-out), transform .15s var(--ease-out); }
.tool-link:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-link strong { color: var(--ink); }
.tool-link span { font-size: .88rem; color: var(--ink-soft); }

/* --- Select & comisión line (préstamo / amortización) --- */
.field select {
  width: 100%; border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--surface-2); color: var(--ink); padding: 12px;
  font-size: 1.02rem;
}
.field select:focus-visible { border-color: var(--accent); }
.results__extra { margin-top: 12px; font-size: .92rem; color: var(--ink-soft); }
.results__extra strong { color: var(--ink); font-variant-numeric: tabular-nums; }

/* --- Amortización anticipada --- */
.result-grid--2 { grid-template-columns: 1fr; }
@media (min-width: 640px) { .result-grid--2 { grid-template-columns: 1fr 1fr; } }
.am-detalle { margin-top: 14px; padding: 14px 16px; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); font-size: .95rem; color: var(--ink-soft); }
.am-detalle strong { color: var(--ink); }

/* --- Comparador --- */
.cmp-cols { display: grid; gap: 18px; }
@media (min-width: 720px) { .cmp-cols { grid-template-columns: 1fr 1fr; } }
.cmp-col { border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px; background: var(--surface-2); display: grid; gap: 14px; align-content: start; }
.cmp-col > h3 { font-size: 1rem; font-family: var(--display); }
.cmp-tabla-wrap { margin-top: 20px; overflow-x: auto; }
table.cmp { width: 100%; border-collapse: collapse; font-size: .92rem; font-variant-numeric: tabular-nums; }
table.cmp th, table.cmp td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
table.cmp thead th { color: var(--ink-soft); font-weight: 600; }
table.cmp tbody th { text-align: left; font-weight: 500; color: var(--ink-soft); }
table.cmp td.win { color: var(--accent-ink); font-weight: 700; background: var(--accent-soft); }
.cmp-veredicto { margin-top: 16px; padding: 14px 16px; border: 1px solid var(--accent); border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent-ink); font-size: .98rem; }
.cmp-veredicto strong { font-weight: 800; }

/* =============================================================
   8. Legal pages
   ============================================================= */
.legal { margin-top: 34px; }
.legal h1 { font-size: clamp(1.6rem, 4vw, 2.1rem); font-weight: 800; margin-bottom: 8px; }
.legal p, .legal li { color: var(--ink-soft); margin-bottom: 10px; }
.legal h2 { font-size: 1.2rem; margin-top: 26px; margin-bottom: 8px; }
.legal ul { padding-left: 22px; }
.legal .todo { background: var(--accent-soft); border-radius: 6px; padding: 1px 6px; color: var(--accent-ink); font-size: .9em; }

/* =============================================================
   9. Print
   ============================================================= */
@media print {
  .site-header, .site-footer, .ad-wrap, .results__actions, .site-nav,
  .steps, .prose details, .tools-grid, .compare-toggle, input[type="range"],
  .skip-link, .privacy-badge { display: none !important; }
  body { background: #fff; color: #000; }
  .tool-card { border: 0; box-shadow: none; padding: 0; }
  .tabla-wrap { overflow: visible; }
  .tabla th, .tabla td { border-color: #ccc; }
  .prose h2, .prose p { color: #000; }
}

/* =============================================================
   10. Reduced motion
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .tool-link:hover { transform: none; }
}