/* ============================================================
   CalculaFit — Sistema de diseño
   Tema claro (mejor legibilidad + AdSense), acento verde energía
   ============================================================ */

:root {
  /* Colores */
  --green-800: #166534;
  --green-700: #15803d;
  --green-600: #16a34a;
  --green-500: #22c55e;
  --green-100: #dcfce7;
  --green-50: #f0fdf4;
  --amber-500: #f59e0b;
  --red-500: #ef4444;

  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;

  /* Formas */
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 8px 24px -12px rgba(15, 23, 42, .10);
  --shadow-lg: 0 16px 40px -16px rgba(22, 163, 74, .35);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --maxw: 980px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; }

a { color: var(--green-700); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ============ Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; height: 64px;
}

.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.15rem; color: var(--ink);
  letter-spacing: -.02em;
}
.logo:hover { text-decoration: none; }
.logo .logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  display: grid; place-items: center; color: #fff;
  box-shadow: var(--shadow);
}
.logo span.accent { color: var(--green-600); }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 12px; border-radius: 8px;
  color: var(--ink-soft); font-size: .92rem; font-weight: 600;
  white-space: nowrap;
}
.main-nav a:hover { background: var(--green-50); color: var(--green-700); text-decoration: none; }
.main-nav a.active { background: var(--green-100); color: var(--green-800); }

@media (max-width: 760px) {
  .main-nav { display: none; }
  .site-header .container { height: 58px; }
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  font-size: .85rem; color: var(--muted); padding: 18px 0 6px;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--green-700); }
.breadcrumb .sep { opacity: .5; }
.breadcrumb [aria-current] { color: var(--ink-soft); font-weight: 600; }

/* ============ Hero ============ */
.hero {
  padding: 48px 0 32px; text-align: center;
  background:
    radial-gradient(700px 300px at 50% -80px, var(--green-100), transparent),
    var(--bg);
}
.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 2.7rem);
  font-weight: 800; letter-spacing: -.03em; line-height: 1.15;
  max-width: 720px; margin: 0 auto 14px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--green-600), var(--lime, #65a30d));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead {
  color: var(--muted); font-size: 1.08rem; max-width: 560px; margin: 0 auto 24px;
}

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--green-100); color: var(--green-800);
  font-size: .8rem; font-weight: 700; letter-spacing: .02em;
  padding: 5px 12px; border-radius: 999px; margin-bottom: 16px;
}

/* ============ Grid de herramientas ============ */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px; padding: 8px 0 32px;
}

.tool-card {
  display: block; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--green-500);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}
.tool-card .icon {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--green-50); color: var(--green-600);
  display: grid; place-items: center; margin-bottom: 12px;
  font-size: 1.25rem;
}
.tool-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; color: var(--ink); }
.tool-card p { font-size: .86rem; color: var(--muted); }

.tool-card.coming {
  opacity: .55; pointer-events: none;
  border-style: dashed; background: transparent; box-shadow: none;
}
.tool-card.coming .icon { background: var(--bg); color: var(--muted); }

/* ============ Calculadora ============ */
.calc-section { padding: 8px 0 16px; }
.page-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800; letter-spacing: -.02em; margin: 4px 0 8px;
}
.page-intro { color: var(--muted); max-width: 640px; margin-bottom: 24px; }

.calc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  margin-bottom: 28px;
}

.calc-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
@media (max-width: 560px) { .calc-form { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: .86rem; font-weight: 700; color: var(--ink-soft); }
.field .hint { font-size: .78rem; color: var(--muted); font-weight: 400; }

.field input, .field select {
  font: inherit; font-size: .95rem;
  padding: 11px 12px;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: #fff; color: var(--ink);
  transition: border-color .15s ease, box-shadow .15s ease;
  width: 100%;
}
.field input:focus, .field select:focus {
  outline: none; border-color: var(--green-500);
  box-shadow: 0 0 0 3px var(--green-100);
}
.field input[type=number] { -moz-appearance: textfield; }

/* Toggle sexo / objetivos */
.seg {
  display: flex; background: var(--bg);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  padding: 3px; gap: 3px;
}
.seg button {
  flex: 1; font: inherit; font-size: .88rem; font-weight: 600;
  padding: 8px 6px; border: none; border-radius: 7px;
  background: transparent; color: var(--muted); cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.seg button[aria-pressed="true"] {
  background: #fff; color: var(--green-800);
  box-shadow: 0 1px 3px rgba(15, 23, 42, .12);
  font-weight: 700;
}

.btn-primary {
  grid-column: 1 / -1;
  font: inherit; font-size: 1rem; font-weight: 700;
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: #fff; border: none; border-radius: var(--radius-sm);
  padding: 13px 22px; cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .15s ease, filter .15s ease;
}
.btn-primary:hover { filter: brightness(1.05); box-shadow: var(--shadow-lg); }
.btn-primary:active { transform: scale(.985); }

/* ============ Resultado ============ */
.result {
  margin-top: 22px; padding: 22px;
  background: var(--green-50);
  border: 1.5px solid var(--green-100);
  border-radius: var(--radius);
  display: none;
  animation: pop .25s ease;
}
.result.visible { display: block; }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.result .big {
  font-size: clamp(2rem, 6vw, 3rem); font-weight: 800;
  letter-spacing: -.03em; color: var(--green-800); line-height: 1.1;
}
.result .big small { font-size: .45em; font-weight: 700; color: var(--green-700); }
.result .caption { color: var(--ink-soft); margin-top: 6px; font-size: .95rem; }

.result-table { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: .92rem; }
.result-table th, .result-table td {
  text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--green-100);
}
.result-table th { color: var(--muted); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; }
.result-table td:last-child, .result-table th:last-child { text-align: right; }
.result-table td:last-child { font-weight: 700; color: var(--ink); }

/* Escala IMC */
.bmi-scale {
  display: flex; height: 12px; border-radius: 999px; overflow: hidden; margin: 18px 0 8px;
}
.bmi-scale span { flex: 1; }
.bmi-scale .s1 { background: #93c5fd; }
.bmi-scale .s2 { background: var(--green-500); }
.bmi-scale .s3 { background: var(--amber-500); }
.bmi-scale .s4 { background: var(--red-500); }
.bmi-marker {
  width: 4px; height: 22px; background: var(--ink); border-radius: 2px;
  position: relative; top: -17px; margin-left: 0;
  transition: margin-left .4s ease;
}

/* Macros: barras */
.macro-bars { display: grid; gap: 12px; margin-top: 18px; }
.macro-row .bar-head {
  display: flex; justify-content: space-between; font-size: .88rem; font-weight: 700;
  margin-bottom: 5px;
}
.macro-row .bar-head span:last-child { color: var(--muted); font-weight: 600; }
.macro-row .track {
  height: 10px; border-radius: 999px; background: var(--green-100); overflow: hidden;
}
.macro-row .fill { height: 100%; border-radius: 999px; transition: width .5s ease; }
.macro-row.prot .fill { background: linear-gradient(90deg, #3b82f6, #2563eb); }
.macro-row.carb .fill { background: linear-gradient(90deg, var(--amber-500), #d97706); }
.macro-row.fat  .fill { background: linear-gradient(90deg, #f43f5e, #e11d48); }

/* ============ Contenido SEO ============ */
.content { padding: 8px 0 40px; max-width: 760px; }
.content h2 {
  font-size: 1.35rem; font-weight: 800; letter-spacing: -.01em;
  margin: 30px 0 10px; padding-top: 8px;
}
.content h3 { font-size: 1.05rem; font-weight: 700; margin: 20px 0 6px; }
.content p, .content li { color: var(--ink-soft); font-size: .96rem; }
.content ul, .content ol { padding-left: 22px; margin: 8px 0; }
.content li { margin: 5px 0; }
.content strong { color: var(--ink); }
.content .formula {
  background: var(--card); border: 1px dashed var(--green-500);
  border-radius: var(--radius-sm); padding: 14px 16px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: .88rem; color: var(--ink); margin: 12px 0;
  overflow-x: auto; line-height: 1.7;
}

/* ============ FAQ ============ */
.faq { margin: 10px 0 24px; }
.faq details {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); margin-bottom: 10px;
  overflow: hidden;
}
.faq details[open] { border-color: var(--green-500); }
.faq summary {
  cursor: pointer; font-weight: 700; font-size: .95rem;
  padding: 14px 16px; list-style: none; position: relative;
  padding-right: 40px; color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 16px; top: 50%;
  transform: translateY(-50%); font-size: 1.3rem; color: var(--green-600);
  transition: transform .2s ease;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 16px 14px; color: var(--ink-soft); font-size: .92rem; }

/* ============ Relacionadas ============ */
.related { padding: 8px 0 44px; }
.related h2 { font-size: 1.2rem; font-weight: 800; margin-bottom: 14px; }
.related .tools-grid { padding: 0; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

/* ============ Features (home) ============ */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; padding: 20px 0 36px; }
.feature {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.feature .f-icon {
  width: 40px; height: 40px; border-radius: 10px; margin-bottom: 10px;
  background: var(--green-100); color: var(--green-800);
  display: grid; place-items: center; font-size: 1.15rem;
}
.feature h3 { font-size: .98rem; margin-bottom: 4px; }
.feature p { font-size: .87rem; color: var(--muted); }

/* ============ CTA final ============ */
.cta-box {
  background: linear-gradient(135deg, var(--green-600), var(--green-800));
  color: #fff; border-radius: var(--radius);
  padding: 30px 26px; text-align: center; margin: 12px 0 44px;
  box-shadow: var(--shadow-lg);
}
.cta-box h2 { font-size: 1.3rem; font-weight: 800; margin-bottom: 8px; }
.cta-box p { color: #dcfce7; font-size: .95rem; margin-bottom: 16px; }
.cta-box .btn-white {
  display: inline-block; background: #fff; color: var(--green-800);
  font-weight: 700; padding: 11px 22px; border-radius: var(--radius-sm);
}
.cta-box .btn-white:hover { text-decoration: none; transform: translateY(-1px); }

/* ============ Footer ============ */
.site-footer {
  background: var(--ink); color: #94a3b8;
  padding: 36px 0 28px; margin-top: 20px;
}
.site-footer .cols {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 28px; margin-bottom: 26px;
}
@media (max-width: 640px) { .site-footer .cols { grid-template-columns: 1fr; } }
.site-footer h4 { color: #e2e8f0; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 10px; }
.site-footer a { color: #94a3b8; font-size: .9rem; display: block; padding: 3px 0; }
.site-footer a:hover { color: var(--green-500); text-decoration: none; }
.site-footer .brand-line { display: flex; align-items: center; gap: 10px; color: #e2e8f0; font-weight: 800; margin-bottom: 10px; }
.site-footer .brand-line .logo-mark {
  width: 28px; height: 28px; border-radius: 7px;
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  display: grid; place-items: center; color: #fff;
}
.site-footer p { font-size: .88rem; max-width: 340px; }
.site-footer .legal {
  border-top: 1px solid #1e293b; padding-top: 18px;
  display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: .82rem;
  justify-content: space-between;
}

/* Espacio para ads (AdSense futuro) */
.ad-slot {
  min-height: 0; text-align: center; margin: 8px 0;
}
@media (min-width: 900px) {
  .ad-slot { min-height: 90px; margin: 18px 0; }
}

/* Utilidades */
.text-center { text-align: center; }
.mt-2 { margin-top: 12px; }
.hidden { display: none !important; }

/* Error de validación */
.field.error input, .field.error select { border-color: var(--red-500); }
.form-error {
  grid-column: 1 / -1; display: none;
  background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c;
  border-radius: var(--radius-sm); padding: 10px 14px; font-size: .88rem; font-weight: 600;
}
.form-error.visible { display: block; }