/* =========================================================
   facturadegasnatural.es — sistema de diseño
   ========================================================= */

:root {
  --navy-900: #0b1f3a;
  --navy-800: #102844;
  --navy-700: #17375c;
  --navy-600: #234873;

  --amber-500: #e8871e;
  --amber-600: #c56d0f;
  --amber-100: #fdf1e2;

  --teal-500: #0f8b8d;
  --teal-600: #0c6f70;
  --teal-100: #e6f5f5;

  --slate-900: #16202b;
  --slate-700: #3d4a58;
  --slate-500: #64748b;
  --slate-300: #cbd5e1;
  --slate-100: #f3f5f7;
  --slate-50:  #f9fafb;

  --white: #ffffff;
  --success: #1f9d55;

  --border: #e3e7ec;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 1px 3px rgba(11, 31, 58, 0.08);
  --shadow-md: 0 8px 24px rgba(11, 31, 58, 0.10);
  --shadow-lg: 0 20px 48px rgba(11, 31, 58, 0.16);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--slate-900);
  background: var(--white);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; font-weight: 750; letter-spacing: -0.01em; }
p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 88px 0; }
@media (max-width: 720px) {
  section { padding: 56px 0; }
}

/* ---------- Eyebrow / kicker ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber-600);
  margin-bottom: 14px;
}
.eyebrow.teal { color: var(--teal-600); }
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: currentColor;
  display: inline-block;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 26px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 15.5px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-lg { padding: 17px 30px; font-size: 16.5px; }

.btn-amber { background: var(--amber-500); color: var(--white); box-shadow: var(--shadow-sm); }
.btn-amber:hover { background: var(--amber-600); box-shadow: var(--shadow-md); }

.btn-teal { background: var(--teal-500); color: var(--white); box-shadow: var(--shadow-sm); }
.btn-teal:hover { background: var(--teal-600); box-shadow: var(--shadow-md); }

.btn-navy { background: var(--navy-900); color: var(--white); }
.btn-navy:hover { background: var(--navy-700); }

.btn-outline { background: transparent; border-color: rgba(255,255,255,0.5); color: var(--white); }
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }

.btn-outline-dark { background: transparent; border-color: var(--slate-300); color: var(--navy-900); }
.btn-outline-dark:hover { border-color: var(--navy-900); }

.btn-whatsapp { background: #1fa855; color: var(--white); }
.btn-whatsapp:hover { background: #17893f; }

.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 17px; color: var(--navy-900);
}
.logo .mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--navy-900), var(--teal-600));
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.logo .mark svg { width: 18px; height: 18px; }
.logo small { display: block; font-weight: 500; font-size: 11.5px; color: var(--slate-500); margin-top: 1px; }
.logo-img { height: 42px; width: auto; display: block; border-radius: 6px; }
@media (max-width: 480px) { .logo-img { height: 34px; } }

.main-nav { display: flex; align-items: center; gap: 30px; }
.main-nav a {
  font-size: 14.5px; font-weight: 600; color: var(--slate-700);
  padding: 8px 0; border-bottom: 2px solid transparent;
}
.main-nav a:hover { color: var(--navy-900); }
.header-ctas { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none; background: none; border: 1px solid var(--border); border-radius: var(--radius-sm);
  cursor: pointer; width: 42px; height: 42px; align-items: center; justify-content: center; flex-shrink: 0;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--navy-900); position: relative; }
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--navy-900);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

@media (max-width: 900px) {
  .main-nav {
    display: none; position: absolute; top: 76px; left: 0; right: 0;
    background: var(--white); flex-direction: column; align-items: flex-start;
    gap: 2px; padding: 10px 24px 22px; box-shadow: var(--shadow-md); border-bottom: 1px solid var(--border);
  }
  .main-nav.open { display: flex; }
  .main-nav a { width: 100%; padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: flex; }
  .header-ctas { gap: 8px; }
  .header-ctas .btn span.long { display: none; }
  .header-ctas .btn { padding: 0; width: 40px; height: 40px; }
}

@media (max-width: 480px) {
  .site-header .container { padding: 0 14px; }
  .logo { font-size: 14.5px; gap: 8px; }
  .logo .mark { width: 30px; height: 30px; }
  .logo small { font-size: 10.5px; }
  .nav-toggle { width: 38px; height: 38px; }
  .header-ctas .btn { width: 38px; height: 38px; }
  .btn:not(.header-ctas .btn) { white-space: normal; }
}

/* ---------- Trust bar ---------- */
.trust-bar {
  background: var(--navy-900); color: rgba(255,255,255,0.88);
  font-size: 13.5px; padding: 10px 0;
}
.trust-bar .container { display: flex; gap: 28px; flex-wrap: wrap; justify-content: center; text-align: center; }
.trust-bar strong { color: var(--white); }

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1100px 520px at 15% -10%, #14304f 0%, var(--navy-900) 55%, #081426 100%);
  color: var(--white);
  padding: 76px 0 0;
  position: relative;
  overflow: hidden;
}
.hero .container { position: relative; z-index: 2; }
.hero-head { max-width: 760px; margin: 0 auto; text-align: center; }
.hero h1 { font-size: clamp(30px, 4.4vw, 48px); }
.hero h1 .accent { color: var(--amber-500); }
.hero-sub { margin-top: 18px; font-size: 18px; color: rgba(255,255,255,0.82); max-width: 620px; margin-left: auto; margin-right: auto; }

.segment-picker {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
  margin: 44px 0 0;
}
@media (max-width: 760px) { .segment-picker { grid-template-columns: 1fr; } }

.segment-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-lg);
  padding: 30px 28px 28px;
  text-align: left;
  backdrop-filter: blur(6px);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.segment-card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.35); background: rgba(255,255,255,0.1); }
.segment-card .tag {
  display: inline-block; font-size: 12px; font-weight: 800; letter-spacing: .05em;
  text-transform: uppercase; padding: 5px 10px; border-radius: 999px; margin-bottom: 14px;
}
.segment-card.empresas .tag { background: var(--amber-500); color: var(--white); }
.segment-card.hogares .tag { background: var(--teal-500); color: var(--white); }
.segment-card h3 { font-size: 22px; color: var(--white); }
.segment-card p.desc { margin-top: 8px; color: rgba(255,255,255,0.78); font-size: 15px; }
.segment-card .ranges { margin: 18px 0 22px; display: flex; flex-direction: column; gap: 8px; }
.segment-card .ranges li { font-size: 13.5px; color: rgba(255,255,255,0.75); display: flex; gap: 8px; align-items: baseline; }
.segment-card .ranges b { color: var(--white); font-weight: 700; min-width: 66px; }

.hero-note {
  margin: 34px 0 0; text-align: center; font-size: 13.5px; color: rgba(255,255,255,0.55);
  max-width: 620px; margin-left: auto; margin-right: auto;
}
.hero-strip {
  margin-top: 56px; border-top: 1px solid rgba(255,255,255,0.12);
  padding: 22px 0;
}
.hero-strip .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 14px; color: rgba(255,255,255,0.6); font-size: 13px; }

/* ---------- Section headers ---------- */
.section-head { max-width: 640px; margin-bottom: 46px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(24px, 3vw, 34px); color: var(--navy-900); }
.section-head p { margin-top: 12px; color: var(--slate-500); font-size: 16.5px; }

/* ---------- Cards grid (bill anatomy / checks) ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.info-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 26px 24px; box-shadow: var(--shadow-sm);
}
.info-card .num {
  width: 38px; height: 38px; border-radius: 10px; background: var(--amber-100); color: var(--amber-600);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 15px; margin-bottom: 16px;
}
.info-card h4 { font-size: 16.5px; color: var(--navy-900); margin-bottom: 8px; }
.info-card p { font-size: 14.5px; color: var(--slate-500); }

/* ---------- Bands ---------- */
.band { background: var(--slate-50); }
.band-navy { background: var(--navy-900); color: var(--white); }
.band-navy .section-head h2 { color: var(--white); }
.band-navy .section-head p { color: rgba(255,255,255,0.68); }

/* ---------- Tariff table / cards ---------- */
.tariff-groups { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
@media (max-width: 860px) { .tariff-groups { grid-template-columns: 1fr; } }
.tariff-group {
  border-radius: var(--radius-lg); padding: 30px 26px; border: 1px solid var(--border);
}
.tariff-group.hogares { background: var(--teal-100); border-color: #cdeceb; }
.tariff-group.empresas { background: var(--amber-100); border-color: #f6ddb9; }
.tariff-group h3 { font-size: 19px; color: var(--navy-900); margin-bottom: 4px; }
.tariff-group .sub { font-size: 14px; color: var(--slate-500); margin-bottom: 18px; }
.tariff-row {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: rgba(255,255,255,0.75); border-radius: var(--radius-sm);
  padding: 14px 16px; margin-bottom: 10px; font-size: 14.5px;
}
.tariff-row:last-child { margin-bottom: 0; }
.tariff-row .code { font-weight: 800; color: var(--navy-900); min-width: 56px; }
.tariff-row .range { color: var(--slate-700); flex: 1; }
.tariff-row a { font-weight: 700; font-size: 13.5px; color: var(--teal-600); white-space: nowrap; }
.tariff-group.empresas .tariff-row a { color: var(--amber-600); }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
@media (max-width: 860px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding-left: 54px; }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--navy-900); color: var(--white);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 15px;
}
.step h4 { font-size: 16.5px; color: var(--navy-900); margin-bottom: 6px; }
.step p { font-size: 14.5px; color: var(--slate-500); }

/* ---------- Testimonial / trust ---------- */
.disclaimer-box {
  border: 1.5px dashed var(--slate-300); border-radius: var(--radius-md);
  padding: 22px 24px; font-size: 14px; color: var(--slate-600); background: var(--slate-50);
}
.disclaimer-box strong { color: var(--navy-900); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  width: 100%; text-align: left; background: none; border: none; cursor: pointer;
  padding: 20px 4px; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  font-size: 16px; font-weight: 700; color: var(--navy-900); font-family: inherit;
}
.faq-q .plus { flex-shrink: 0; width: 22px; height: 22px; position: relative; }
.faq-q .plus::before, .faq-q .plus::after {
  content: ""; position: absolute; background: var(--navy-900); border-radius: 2px;
}
.faq-q .plus::before { width: 14px; height: 2px; top: 10px; left: 4px; }
.faq-q .plus::after { width: 2px; height: 14px; top: 4px; left: 10px; transition: transform .2s ease; }
.faq-item.open .plus::after { transform: rotate(90deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.faq-a p { padding: 0 4px 20px; font-size: 14.5px; color: var(--slate-500); max-width: 680px; }

/* ---------- Partner banners ---------- */
.banner-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 760px) { .banner-grid { grid-template-columns: 1fr; } }
.banner-card {
  display: block; border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .15s ease;
}
.banner-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.banner-card img { width: 100%; height: auto; display: block; }

/* ---------- CTA band ---------- */
.cta-band {
  border-radius: var(--radius-lg);
  padding: 48px 44px;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
}
.cta-band.amber { background: linear-gradient(120deg, #f0982f, var(--amber-600)); color: var(--white); }
.cta-band.teal { background: linear-gradient(120deg, #159d9f, var(--teal-600)); color: var(--white); }
.cta-band h3 { font-size: 23px; }
.cta-band p { margin-top: 8px; color: rgba(255,255,255,0.9); font-size: 15px; max-width: 460px; }
.cta-band .actions { display: flex; gap: 12px; flex-wrap: wrap; }
@media (max-width: 600px) {
  .cta-band { padding: 32px 24px; }
  .cta-band .actions { width: 100%; flex-direction: column; }
  .cta-band .actions .btn { width: 100%; white-space: normal; text-align: center; }
}

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,0.65); padding: 60px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h5 { color: var(--white); font-size: 13.5px; letter-spacing: .04em; text-transform: uppercase; margin-bottom: 16px; }
.footer-grid li { margin-bottom: 10px; font-size: 14px; }
.footer-grid a:hover { color: var(--white); }
.footer-bottom {
  margin-top: 46px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 12.5px;
}

/* ---------- Utility ---------- */
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; }
.text-center { text-align: center; }
.badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 700;
  padding: 6px 12px; border-radius: 999px; background: var(--slate-100); color: var(--slate-700);
}