/* Fuentes alojadas en el propio sitio (sin dependencias externas) */
@font-face { font-family: "Bricolage Grotesque"; src: url("fonts/bricolage-grotesque-latin-wght-normal.woff2") format("woff2"); font-weight: 200 800; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "IBM Plex Sans"; src: url("fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-display: swap; }

:root {
  --paper: #e9ece6;
  --paper-2: #f4f6f2;
  --ink: #18201d;
  --ink-2: #4b5651;
  --line: #c7cdc5;
  --btc: #e0892e;
  --eth: #5a5fc8;
  --ok: #2f7a4f;
  --warn: #a5560c;
  --danger: #b3352b;

  --display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --text: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;

  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.6rem;
  --step-3: clamp(2rem, 4.6vw, 4.2rem);

  --radius-lg: 22px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--text);
  font-size: var(--step-0);
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}
:focus-visible { outline: 3px solid var(--eth); outline-offset: 2px; border-radius: 6px; }

/* ── Barra superior ── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px clamp(16px, 4vw, 56px);
}
.wordmark {
  font-family: var(--display); font-weight: 800; font-size: 1.75rem; letter-spacing: -0.035em;
  color: var(--ink); text-decoration: none; display: inline-flex; align-items: center;
}
/* El nombre ya contiene los dos activos: BI(tcoin) + ET(her) */
.wm-bi { color: var(--btc); }
.wm-et { color: var(--eth); }
.topbar-right { display: flex; gap: 12px; align-items: center; }
.net {
  font-size: var(--step--1); color: var(--ink-2); padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px;
}

.banner {
  margin: 0 clamp(16px, 4vw, 56px) 8px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: #f6e7d5; color: #5c3204; font-size: var(--step--1);
}
.banner.is-danger { background: #f3dcd9; color: #6b1d16; }

main { padding: 0 clamp(16px, 4vw, 56px); max-width: 1240px; margin: 0 auto; }

/* ── Hero: la fórmula ── */
.hero { padding: clamp(28px, 6vw, 72px) 0 clamp(24px, 4vw, 48px); }
.formula {
  font-family: var(--display); font-weight: 600; font-size: var(--step-3); line-height: 1.05;
  letter-spacing: -0.03em; margin: 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.12em 0.32em;
}
.f-op { color: var(--ink-2); font-weight: 400; }
.f-btc { color: var(--btc); }
.f-eth { color: var(--eth); }
.f-total { white-space: nowrap; }
.f-usd { font-weight: 800; }
.lede { max-width: 62ch; font-size: var(--step-1); line-height: 1.5; color: var(--ink-2); margin: 22px 0 28px; }

.mix { margin: 0; max-width: 760px; }
.mix-bar {
  display: flex; height: 14px; border-radius: 999px; overflow: hidden; background: var(--line);
}
.mix-bar span { display: block; height: 100%; transition: width 600ms cubic-bezier(.2,.7,.2,1); }
.mix-btc { background: var(--btc); width: 50%; }
.mix-eth { background: var(--eth); width: 50%; }
.mix-legend {
  display: flex; flex-wrap: wrap; gap: 6px 22px; margin-top: 10px; font-size: var(--step--1); color: var(--ink-2);
}
.mix-legend b { color: var(--ink); font-weight: 600; margin-left: 4px; }
.mix-note { flex-basis: 100%; }
.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 7px; vertical-align: 1px; }
.dot-btc { background: var(--btc); }
.dot-eth { background: var(--eth); }

/* ── Grilla principal ── */
.grid {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(20px, 3vw, 40px);
  align-items: start; padding-bottom: clamp(40px, 6vw, 80px);
}
@media (max-width: 900px) { .grid { grid-template-columns: minmax(0, 1fr); } }

/* ── Panel de operación (la única "tarjeta" de la página) ── */
.trade {
  background: var(--paper-2); border-radius: var(--radius-lg); padding: clamp(18px, 2.6vw, 28px);
  box-shadow: 0 1px 0 var(--line), 0 18px 40px -28px rgba(24, 32, 29, 0.45);
}
.tabs { display: flex; gap: 4px; background: var(--paper); padding: 4px; border-radius: 14px; margin-bottom: 22px; }
.tab {
  flex: 1; border: 0; background: transparent; padding: 10px 8px; border-radius: 10px; cursor: pointer;
  font: 500 var(--step--1)/1.2 var(--text); color: var(--ink-2);
}
.tab[aria-selected="true"] { background: var(--paper-2); color: var(--ink); box-shadow: 0 1px 2px rgba(24,32,29,.12); }

.panel { display: flex; flex-direction: column; gap: 18px; }
.panel-intro { margin: 0; color: var(--ink-2); max-width: 60ch; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-inline { flex-direction: row; align-items: center; justify-content: space-between; }
.field-label { font-size: var(--step--1); color: var(--ink-2); }
.field-row {
  display: flex; align-items: center; gap: 10px; border: 1px solid var(--line); border-radius: 14px;
  padding: 6px 8px 6px 16px; background: #fff;
}
.field-row:focus-within { border-color: var(--eth); }
.field-row input {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent;
  font: 600 var(--step-2)/1.3 var(--display); color: var(--ink); padding: 6px 0;
}
.field-row .unit { font-weight: 600; padding: 0 10px; }
select {
  font: 600 var(--step-0) var(--text); color: var(--ink); background: var(--paper); border: 0;
  border-radius: 10px; padding: 10px 12px; cursor: pointer;
}
.field-hint { font-size: var(--step--1); color: var(--ink-2); display: flex; gap: 10px; align-items: center; }

.receive { display: flex; flex-direction: column; gap: 2px; padding: 4px 2px; }
.receive-amount { font: 600 var(--step-2)/1.2 var(--display); letter-spacing: -0.01em; }
.receive-usd { color: var(--ink-2); font-size: var(--step--1); min-height: 1.2em; }

.breakdown { margin: 0; display: grid; gap: 8px; border-top: 1px solid var(--line); padding-top: 14px; }
.breakdown div { display: flex; justify-content: space-between; gap: 16px; font-size: var(--step--1); }
.breakdown dt { color: var(--ink-2); }
.breakdown dd { margin: 0; font-weight: 500; text-align: right; }

.btn {
  font: 600 var(--step-0)/1 var(--text); border-radius: 14px; padding: 15px 20px; cursor: pointer; border: 0;
}
.btn:disabled { cursor: not-allowed; opacity: 0.55; }
.btn-primary { background: var(--ink); color: var(--paper-2); width: 100%; }
.btn-primary:not(:disabled):hover { background: #26322d; }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--ink); padding: 11px 16px; font-size: var(--step--1); }
.btn-ghost:hover { background: rgba(24,32,29,.06); }
.link {
  background: none; border: 0; padding: 0; color: var(--eth); font: inherit; font-size: var(--step--1);
  text-decoration: underline; text-underline-offset: 3px; cursor: pointer;
}

.tx-status { min-height: 1.4em; margin: 14px 0 0; font-size: var(--step--1); }
.tx-status.is-ok { color: var(--ok); }
.tx-status.is-error { color: var(--danger); }
.tx-status a { color: inherit; }

.settings { margin-top: 10px; font-size: var(--step--1); color: var(--ink-2); }
.settings summary { cursor: pointer; }
.settings p { margin: 8px 0; max-width: 56ch; }
.slip-options { display: flex; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 14px; cursor: pointer;
  font: 500 var(--step--1) var(--text); color: var(--ink);
}
.chip[aria-checked="true"] { border-color: var(--ink); background: var(--ink); color: var(--paper-2); }

/* ── Respaldo ── */
.backing h2, .costs h2, .how h2 {
  font-family: var(--display); font-weight: 600; font-size: var(--step-2); letter-spacing: -0.02em; margin: 0 0 6px;
}
.muted { color: var(--ink-2); font-size: var(--step--1); max-width: 64ch; }
.ledger { width: 100%; border-collapse: collapse; margin: 18px 0 10px; font-size: var(--step-0); }
.ledger th, .ledger td { text-align: right; padding: 12px 0; border-bottom: 1px solid var(--line); }
.ledger thead th { font-weight: 500; font-size: var(--step--1); color: var(--ink-2); }
.ledger tbody th { text-align: left; font-weight: 600; }
.backing-verdict { font-weight: 600; margin: 14px 0; }
.backing-verdict.is-ok { color: var(--ok); }
.backing-verdict.is-error { color: var(--danger); }
.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 0 0 16px; }
.facts dt { font-size: var(--step--1); color: var(--ink-2); }
.facts dd { margin: 2px 0 0; font: 600 var(--step-1) var(--display); }

.faucet { margin-top: 36px; padding-top: 22px; border-top: 1px dashed var(--line); }
.faucet h3 { font: 600 var(--step-1) var(--display); margin: 0 0 4px; }
.faucet-buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

/* ── Costos ── */
.costs { padding: clamp(32px, 5vw, 64px) 0; border-top: 1px solid var(--line); }
.costs-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; margin: 22px 0 14px; }
.costs-grid p { margin: 0; color: var(--ink-2); font-size: var(--step--1); max-width: 22ch; }
.costs-grid .cost-num { font: 800 var(--step-2) var(--display); color: var(--ink); letter-spacing: -0.02em; }
@media (max-width: 760px) { .costs-grid { grid-template-columns: 1fr 1fr; } }

/* ── Cómo funciona (sí es una secuencia) ── */
.how { padding: clamp(32px, 5vw, 64px) 0; border-top: 1px solid var(--line); }
.steps { margin: 20px 0 14px; padding-left: 1.4em; display: grid; gap: 12px; max-width: 70ch; }
.steps li { padding-left: 6px; }
.steps li::marker { font-family: var(--display); font-weight: 800; color: var(--ink-2); }

.footer {
  padding: 28px clamp(16px, 4vw, 56px) 48px; border-top: 1px solid var(--line); font-size: var(--step--1);
  color: var(--ink-2); max-width: 1240px; margin: 0 auto;
}
.footer p { margin: 6px 0; }
.footer a { color: var(--ink-2); }

@media (prefers-reduced-motion: reduce) {
  .mix-bar span { transition: none; }
}