/* ---------- Tokens ---------- */
:root {
  --bg: #f6f7f5;
  --surface: #ffffff;
  --surface-2: #f0f3f1;
  --text: #1a1d1b;
  --muted: #5f6661;
  --border: #e1e5e2;
  --accent: #1f6f5c;
  --accent-hover: #185a4a;
  --accent-soft: #e3f0eb;
  --accent-text: #ffffff;
  --gold: #f3b941;
  --warn: #9a5b00;
  --error: #b3261e;
  --shadow: 0 1px 2px rgba(20, 40, 30, .05), 0 4px 16px rgba(20, 40, 30, .05);
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111513;
    --surface: #1a201d;
    --surface-2: #222a26;
    --text: #e8ece9;
    --muted: #9ba59f;
    --border: #2e3833;
    --accent: #4fb596;
    --accent-hover: #6cc7aa;
    --accent-soft: #1d3a31;
    --accent-text: #0d1a15;
    --warn: #f0b75a;
    --error: #ff8a80;
    --shadow: none;
    color-scheme: dark;
  }
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
[hidden] { display: none !important; }

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

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.wrap.wide { max-width: 1320px; }
.wrap.wide .hero > *, .wrap.wide .content, .wrap.wide .waitlist { max-width: 860px; }

/* ---------- Cabecera ---------- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 12px 16px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 800; font-size: 1.25rem; letter-spacing: -.3px; }
.brand:hover { color: var(--text); }
.brand img { width: 34px; height: 34px; display: block; }
.brand em { color: var(--accent); font-style: normal; }
.tools-nav { display: flex; gap: 2px; flex-wrap: wrap; }
.tools-nav a { color: var(--muted); text-decoration: none; padding: 7px 11px; border-radius: 8px; font-size: .93rem; font-weight: 500; }
.tools-nav a:hover { color: var(--text); background: var(--surface-2); }
.tools-nav a[aria-current="page"] { color: var(--accent); font-weight: 650; background: var(--accent-soft); }

/* ---------- Portada de cada herramienta ---------- */
.hero { padding: 36px 0 22px; }
.hero h1 { margin: 0 0 10px; font-size: clamp(1.7rem, 4vw, 2.5rem); line-height: 1.15; letter-spacing: -.8px; }
.hero p { margin: 0; color: var(--muted); font-size: 1.05rem; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 0; padding: 0; list-style: none; }
.badges li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: .88rem;
  padding: 6px 12px;
  border-radius: 999px;
}
.badges li::before { content: "✓"; font-weight: 800; }

/* ---------- Formularios ---------- */
.invoice { display: grid; gap: 16px; counter-reset: step; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.grid-2.tight { gap: 12px; }

fieldset {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin: 0;
  min-width: 0;
  box-shadow: var(--shadow);
}
legend { font-weight: 700; padding: 0 6px; display: inline-flex; align-items: center; gap: 8px; }

/* Pasos numerados para guiar al usuario */
.invoice legend::before {
  counter-increment: step;
  content: counter(step);
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: .8rem;
  font-weight: 800;
}

label { display: block; font-size: .88rem; font-weight: 500; color: var(--muted); margin-bottom: 12px; }
label.check { display: flex; gap: 8px; align-items: center; font-weight: 400; }

input, textarea, select {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 9px 11px;
  font: inherit;
  font-size: .97rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color .15s, box-shadow .15s;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: .7; }
input:hover, textarea:hover, select:hover { border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
label.check input { width: auto; margin: 0; accent-color: var(--accent); }

.field-warn { display: block; color: var(--warn); font-size: .8rem; margin-top: 4px; }
.field-hint { display: block; color: var(--muted); font-size: .8rem; margin-top: 4px; font-weight: 400; }
.field-warn:empty, .field-hint:empty { display: none; }

/* Logo del emisor */
.logo-field { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; font-size: .88rem; font-weight: 500; color: var(--muted); }
.logo-field span { width: 100%; }
.logo-field img { max-height: 40px; max-width: 120px; border: 1px solid var(--border); border-radius: 6px; padding: 2px; background: #fff; }

/* Conceptos */
.lines { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
.lines th { text-align: left; font-size: .8rem; text-transform: uppercase; letter-spacing: .4px; color: var(--muted); font-weight: 600; padding: 4px; }
.lines td { padding: 4px; vertical-align: middle; }
.lines td:nth-child(1) { width: 55%; }
.lines td:nth-child(4) { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; font-weight: 600; }
.lines input { margin: 0; }

/* ---------- Botones ---------- */
button { font: inherit; cursor: pointer; border-radius: 8px; padding: 10px 16px; transition: background .15s, color .15s, border-color .15s, transform .05s; }
button:active { transform: translateY(1px); }
.primary {
  background: var(--accent);
  color: var(--accent-text);
  border: 0;
  width: 100%;
  font-weight: 700;
  margin-top: 14px;
  padding: 12px 18px;
}
.primary:hover { background: var(--accent-hover); color: var(--accent-text); }
.primary:disabled { opacity: .6; cursor: default; }
.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); font-weight: 600; }
.secondary:hover { background: var(--accent-soft); }
.remove { background: transparent; border: 0; color: var(--muted); padding: 6px 8px; }
.remove:hover { color: var(--error); background: var(--surface-2); }
.file-btn { display: inline-block; margin: 0; padding: 6px 12px; font-size: .88rem; cursor: pointer; border-radius: 8px; }
.link-btn { background: none; border: 0; color: var(--muted); text-decoration: underline; padding: 0; font-size: .88rem; }
.button-link { display: block; text-align: center; text-decoration: none; border-radius: 8px; }

/* ---------- Totales ---------- */
.totals {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  align-self: start;
  box-shadow: var(--shadow);
}
.totals div { display: flex; justify-content: space-between; padding: 6px 0; font-variant-numeric: tabular-nums; }
.totals .grand { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 12px; font-size: 1.3rem; font-weight: 800; }
.totals .grand b { color: var(--accent); }
.hint { font-size: .8rem; color: var(--muted); text-align: center; margin: 10px 0 0; }

/* ---------- Vista previa ---------- */
.workspace { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; align-items: start; }
.preview-pane { display: none; }
@media (min-width: 1100px) {
  .workspace { grid-template-columns: minmax(0, 1fr) 460px; }
  .preview-pane {
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 76px;
    height: calc(100vh - 92px);
    max-height: 900px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
  }
  .preview-head { padding: 11px 16px; font-weight: 700; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }
  .preview-head::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #3cc28a; }
  .preview-pane iframe { flex: 1; width: 100%; border: 0; background: #e9ebe8; }
}

/* ---------- Calculadoras ---------- */
.calc { display: grid; grid-template-columns: 3fr 2fr; gap: 16px; max-width: 1000px; }
.calc-mode { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.calc-mode label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  margin: 0;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}
.calc-mode label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.calc-mode input { width: auto; margin: 0; accent-color: var(--accent); }
.calc-mode small { color: var(--muted); }
.calc-result .grand b { font-size: 1.6rem; }

/* ---------- Lista de espera Pro ---------- */
.waitlist {
  background: linear-gradient(135deg, var(--accent-soft), var(--surface) 70%);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 36px;
}
.waitlist h2 { margin: 0 0 8px; letter-spacing: -.3px; }
.waitlist-row { display: flex; gap: 8px; margin-top: 14px; }
.waitlist-row input { margin: 0; flex: 1; }
.waitlist-row .primary { width: auto; margin: 0; white-space: nowrap; }
.waitlist label.check { margin-top: 10px; align-items: flex-start; }
.waitlist label.check input { margin-top: 4px; }
.waitlist-msg { margin: 8px 0 0; min-height: 1.5em; font-weight: 600; color: var(--accent); }
.waitlist-msg.error { color: var(--error); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* ---------- Contenido ---------- */
.content { padding: 44px 0 24px; }
.content h2 { margin: 36px 0 10px; letter-spacing: -.3px; }
.content h3 { margin: 22px 0 6px; }
.content p, .content li { color: color-mix(in srgb, var(--text) 88%, var(--muted)); }
.content li { margin-bottom: 4px; }
.content code { background: var(--surface-2); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; font-size: .92em; }

.legal { padding: 36px 0 56px; max-width: 760px; }
.legal h1 { font-size: 1.9rem; letter-spacing: -.5px; }

/* ---------- Pie ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 28px 0; color: var(--muted); font-size: .88rem; margin-top: 24px; }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px; align-items: flex-start; }
.footer-brand .brand { font-size: 1.05rem; }
.footer-brand .brand img { width: 26px; height: 26px; }
.footer-brand p { margin: 8px 0 0; max-width: 360px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.site-footer nav a { color: var(--muted); text-decoration: none; }
.site-footer nav a:hover { color: var(--accent); text-decoration: underline; }

/* ---------- Móvil ---------- */
@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .calc { grid-template-columns: 1fr; }
  .lines thead { display: none; }
  .lines tr { display: grid; grid-template-columns: 1fr 1fr auto; gap: 6px; padding: 8px 0; border-bottom: 1px solid var(--border); }
  .lines td:nth-child(1) { grid-column: 1 / -1; width: auto; }
  .lines td:nth-child(4) { grid-column: 1 / 3; text-align: left; }
  .site-header { position: static; }
  /* Menú en una fila deslizable */
  .tools-nav { flex-wrap: nowrap; overflow-x: auto; width: 100%; margin: 0 -16px; padding: 0 16px; scrollbar-width: none; }
  .tools-nav::-webkit-scrollbar { display: none; }
  .tools-nav a { white-space: nowrap; }
  .hero { padding-top: 24px; }
}
@media (max-width: 480px) {
  .waitlist-row { flex-direction: column; }
  .waitlist-row .primary { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}