/* ============================================================
   minisplittoneladas.com — Calculadora de BTU
   Tema de marca: dark glass (consistente con el sitio y la
   calculadora de consumo CFE). Inter, cian/índigo/verde.
   ============================================================ */

:root {
  --bg: #070b14;
  --bg2: #0d1424;
  --card: rgba(255, 255, 255, 0.05);
  --card-brd: rgba(255, 255, 255, 0.1);
  --ink: #eaf1fb;
  --ink-soft: #9fb2cc;
  --accent: #38bdf8;
  --accent2: #6366f1;
  --verde: #34d399;
  --amar: #fbbf24;
  --rojo: #f87171;
  --wa: #25d366;
  --warn: var(--amar);

  /* aliases usados por clases heredadas */
  --orange: var(--accent2);
  --orange-dark: var(--accent2);
  --orange-light: rgba(99, 102, 241, 0.16);
  --orange-mid: rgba(99, 102, 241, 0.4);
  --cyan: var(--accent);
  --cyan-light: rgba(56, 189, 248, 0.12);
  --cyan-mid: rgba(56, 189, 248, 0.35);
  --bg-surface: rgba(255, 255, 255, 0.04);
  --surface: rgba(255, 255, 255, 0.04);
  --surface2: rgba(255, 255, 255, 0.08);
  --border: var(--card-brd);
  --border-dark: rgba(255, 255, 255, 0.18);
  --text: var(--ink);
  --text-mid: #cdd9ec;
  --text-muted: var(--ink-soft);
  --warn-bg: rgba(251, 191, 36, 0.1);
  --font-head: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 16px;
  --radius-sm: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.6);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60% 50% at 15% 0%, rgba(99, 102, 241, 0.3), transparent 60%),
    radial-gradient(55% 45% at 90% 10%, rgba(56, 189, 248, 0.25), transparent 60%),
    radial-gradient(60% 60% at 50% 110%, rgba(52, 211, 153, 0.16), transparent 60%),
    var(--bg);
}

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
}

.page-shell {
  min-height: 100vh;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(7, 11, 20, 0.6);
  border-bottom: 1px solid var(--card-brd);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
  padding: 12px 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
}

.brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
}

.brand-accent {
  color: var(--accent);
}

.header-tools {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid var(--card-brd);
  background: rgba(255, 255, 255, 0.06);
  padding: 6px 13px;
  border-radius: 30px;
  transition: 0.16s;
}

.header-tools:hover {
  color: var(--accent);
  border-color: var(--cyan-mid);
}

.headRight{display:flex;align-items:center;gap:8px}
.hnav{display:flex;gap:6px}
.hnav a{font-size:.82rem;font-weight:600;color:var(--ink-soft);text-decoration:none;border:1px solid var(--card-brd);background:rgba(255,255,255,.06);padding:6px 12px;border-radius:30px;transition:.16s}
.hnav a:hover{color:var(--accent);border-color:rgba(56,189,248,.35)}
.hnav a.on{color:var(--accent);border-color:rgba(56,189,248,.5);background:rgba(56,189,248,.12)}
.langToggle{border:1px solid var(--card-brd);background:rgba(255,255,255,.06);color:var(--ink);border-radius:30px;padding:6px 12px;font-size:.82rem;font-weight:800;cursor:pointer}
.langToggle:hover{border-color:rgba(56,189,248,.4);color:var(--accent)}
.dim-helper{display:flex;align-items:center;gap:7px;margin-top:8px;font-size:.8rem;color:var(--ink-soft)}
.dim-helper .nb-input{flex:1;min-width:0;min-height:38px;padding:8px 10px;font-size:.86rem}
.dim-helper .x{flex:none;font-weight:700}
.site-footer{text-align:center;color:var(--ink-soft);font-size:.82rem;padding:20px 16px 40px;border-top:1px solid var(--card-brd);margin-top:10px}
@media(max-width:640px){.hnav{gap:4px}.hnav a{padding:5px 9px;font-size:.74rem}}

/* ---------- hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 44px 24px 30px;
  text-align: center;
}

.ac-icon {
  display: block;
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 16px;
  border: 1px solid var(--cyan-mid);
  border-radius: 999px;
  background: var(--cyan-light);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
  padding: 6px 14px;
}

.hero h1 {
  margin: 0 0 12px;
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero h1 span {
  background: linear-gradient(120deg, var(--accent), var(--accent2) 60%, var(--verde));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  max-width: 520px;
  margin: 0 auto;
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.6;
}

/* ---------- layout ---------- */
.wrapper {
  width: min(100%, 860px);
  margin: 0 auto;
  padding: 22px 16px 64px;
}

.card {
  margin-bottom: 20px;
  border: 1px solid var(--card-brd);
  border-radius: var(--radius);
  background: var(--card);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  padding: 26px;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-transform: none;
}

.section-title {
  margin-bottom: 16px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #04101f;
  font-size: 0.85rem;
  font-weight: 800;
}

.row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.field {
  display: block;
  min-width: 0;
  margin-bottom: 16px;
}

.row2 .field,
.card > .field:last-of-type {
  margin-bottom: 0;
}

.field-label {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
  text-transform: none;
}

.nb-input,
.nb-select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--card-brd);
  border-radius: var(--radius-sm);
  outline: none;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.2;
  padding: 12px 14px;
  transition:
    border-color 0.18s,
    box-shadow 0.18s;
}

.nb-select option,
.nb-select optgroup {
  background: #0d1424;
  color: var(--ink);
}

.nb-input:focus,
.nb-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}

.nb-input::placeholder {
  color: var(--ink-soft);
}

.select-wrap {
  position: relative;
  display: block;
}

.select-wrap::after {
  position: absolute;
  top: 50%;
  right: 13px;
  color: var(--ink-soft);
  content: "▾";
  font-size: 13px;
  pointer-events: none;
  transform: translateY(-50%);
}

.select-wrap .nb-select {
  appearance: none;
  cursor: pointer;
  padding-right: 32px;
}

.input-unit {
  position: relative;
  display: block;
}

.input-unit .nb-input {
  padding-right: 44px;
}

.input-unit span {
  position: absolute;
  top: 50%;
  right: 13px;
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 700;
  pointer-events: none;
  transform: translateY(-50%);
}

.toggle-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  min-height: 46px;
  border: 1px solid var(--card-brd);
  border-radius: var(--radius-sm);
}

.tbtn {
  border: 0;
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.1;
  padding: 10px;
  text-align: center;
  transition:
    background 0.18s,
    color 0.18s;
}

.tbtn:first-child {
  border-right: 1px solid var(--card-brd);
}

.tbtn.on {
  background: var(--cyan-light);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--cyan-mid);
}

.tbtn:hover:not(.on) {
  background: var(--surface2);
  color: var(--ink);
}

.divider {
  height: 1px;
  margin: 22px 0;
  background: var(--card-brd);
}

.optional-pill {
  display: inline-flex;
  align-items: center;
  margin-left: 6px;
  border: 1px solid var(--cyan-mid);
  border-radius: 999px;
  background: var(--cyan-light);
  color: var(--accent);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  text-transform: uppercase;
}

.form-error {
  margin: -2px 0 14px;
  border: 1px solid rgba(248, 113, 113, 0.4);
  border-left: 3px solid var(--rojo);
  border-radius: var(--radius-sm);
  background: rgba(248, 113, 113, 0.1);
  color: #fecaca;
  font-size: 0.84rem;
  line-height: 1.5;
  padding: 10px 14px;
}

.btn-calc {
  width: 100%;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(120deg, var(--accent), var(--accent2));
  box-shadow: 0 14px 34px -10px rgba(56, 189, 248, 0.6);
  color: #04101f;
  cursor: pointer;
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  padding: 16px;
  text-transform: none;
  transition:
    box-shadow 0.18s,
    transform 0.18s;
}

.btn-calc:hover {
  box-shadow: 0 18px 40px -10px rgba(56, 189, 248, 0.7);
  transform: translateY(-2px);
}

.btn-calc:active {
  transform: translateY(0);
}

/* ---------- results ---------- */
.results-card {
  margin-bottom: 20px;
  border: 1px solid var(--cyan-mid);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(99, 102, 241, 0.08));
  box-shadow: var(--shadow);
  padding: 26px;
}

.results-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.results-title::before {
  display: block;
  width: 4px;
  height: 22px;
  border-radius: 3px;
  background: var(--accent);
  content: "";
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.stat-box {
  min-height: 92px;
  border: 1px solid var(--card-brd);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  padding: 16px 18px;
}

.stat-box.primary {
  border-color: var(--cyan-mid);
  background: var(--cyan-light);
}

.stat-box.secondary {
  border-color: rgba(99, 102, 241, 0.4);
  background: rgba(99, 102, 241, 0.14);
}

.stat-label {
  margin-bottom: 6px;
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.15;
  text-transform: uppercase;
}

.stat-value {
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-value .unit {
  margin-left: 3px;
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 600;
}

.stat-box.primary .stat-value {
  color: var(--accent);
}

.stat-box.secondary .stat-value {
  color: #c7b3ff;
}

.rec-box {
  margin-bottom: 14px;
  border: 1px solid var(--card-brd);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-mid);
  font-size: 0.9rem;
  line-height: 1.7;
  padding: 18px;
}

.rec-box p {
  margin: 0;
}

.rec-box strong {
  color: var(--ink);
}

.rec-box .sep {
  margin: 12px 0;
  border: 0;
  border-top: 1px solid var(--card-brd);
}

.model-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border: 1px solid var(--card-brd);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1;
  padding: 7px 14px;
}

.chip.recommended {
  border-color: var(--cyan-mid);
  background: var(--cyan-light);
  color: var(--accent);
  font-weight: 700;
}

.alert-box {
  margin-top: 14px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  line-height: 1.5;
  padding: 12px 16px;
}

.alert-box.warn {
  border: 1px solid rgba(251, 191, 36, 0.35);
  border-left: 3px solid var(--amar);
  background: var(--warn-bg);
  color: #fde2a6;
}

/* ---------- CTA ---------- */
.cta-card {
  margin-bottom: 20px;
  border: 1px solid var(--cyan-mid);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(52, 211, 153, 0.1));
  box-shadow: var(--shadow-sm);
  padding: 26px;
  text-align: center;
}

.cta-card h2 {
  margin: 0 0 8px;
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.cta-card p {
  max-width: 620px;
  margin: 0 auto 18px;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.65;
}

.cta-card p strong {
  color: var(--ink);
}

.cta-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.btn-cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 420px;
  min-height: 44px;
  border: 1px solid var(--cyan-mid);
  border-radius: 13px;
  background: var(--cyan-light);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 11px 20px;
  text-decoration: none;
  transition: 0.16s;
}

.btn-cta-secondary:hover {
  background: rgba(56, 189, 248, 0.2);
  transform: translateY(-1px);
}

.footer-note {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.76rem;
  line-height: 1.6;
  text-align: center;
}

@media (max-width: 640px) {
  .hero {
    padding: 34px 20px 24px;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .wrapper {
    padding: 18px 14px 54px;
  }

  .card,
  .results-card,
  .cta-card {
    padding: 20px;
  }

  .row2 {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .row2 .field {
    margin-bottom: 16px;
  }

  .row2 .field:last-child {
    margin-bottom: 0;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .toggle-row {
    grid-template-columns: 1fr;
  }

  .tbtn:first-child {
    border-right: 0;
    border-bottom: 1px solid var(--card-brd);
  }

  .header-tools {
    display: none;
  }
}

.cost-card{margin-top:14px;border:1px solid var(--card-brd);border-radius:14px;background:rgba(255,255,255,.03);padding:18px}
.cost-title{font-weight:800;font-size:1rem;margin-bottom:12px;letter-spacing:-.01em}
.cost-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:7px 0;border-bottom:1px solid rgba(255,255,255,.06);font-size:.9rem;color:var(--ink-soft)}
.cost-row b{color:var(--ink);font-weight:700}
.cost-row.total{border-bottom:0;margin-top:4px;padding-top:12px;border-top:1px solid var(--card-brd)}
.cost-row.total span{color:var(--ink);font-weight:700}
.cost-row.total b{color:var(--verde);font-size:1.05rem}
.cost-extra{font-size:.8rem;color:var(--ink-soft);margin-top:8px}
.cost-luz{font-size:.9rem;margin-top:10px;color:var(--ink)}
.cost-luz a{color:var(--accent);text-decoration:none;font-weight:700}
.cost-note{font-size:.74rem;color:var(--ink-soft);margin-top:8px}
.foot-links{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:10px}
.foot-links a{color:var(--ink-soft);text-decoration:none;font-weight:600}
.foot-links a:hover{color:var(--accent)}