/* =====================================================
   CalculadoraCivil.com — hoja de estilos principal
   Mobile-first, sin dependencias externas
   ===================================================== */

:root {
  --color-primary: #1B4FD8;
  --color-secondary: #0F3AA8;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #1E293B;
  --color-text-light: #475569;
  --color-border: #E2E8F0;
  --color-success: #059669;
  --color-success-bg: #ECFDF5;
  --color-danger: #DC2626;
  --color-danger-bg: #FEF2F2;
  --font-main: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

img, svg {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  line-height: 1.25;
  color: var(--color-text);
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.3rem;
  margin: 2rem 0 0.75rem;
  border-bottom: 3px solid var(--color-primary);
  display: inline-block;
  padding-bottom: 0.25rem;
}

h3 {
  font-size: 1.05rem;
}

p {
  margin: 0 0 1rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
}
.skip-link:focus {
  left: 0;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.logo:hover {
  text-decoration: none;
}
.logo span {
  color: var(--color-text);
  font-weight: 600;
}

.search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  color: var(--color-text);
}
.search-toggle svg { width: 20px; height: 20px; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  order: 2;
}
.nav-toggle svg { width: 22px; height: 22px; }

.main-nav {
  width: 100%;
  order: 3;
  display: none;
}
.main-nav.is-open {
  display: block;
}
.main-nav ul {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.main-nav a {
  display: block;
  padding: 0.5rem 0.25rem;
  color: var(--color-text);
  border-radius: var(--radius);
}
.main-nav a:hover {
  background: var(--color-bg);
  text-decoration: none;
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .main-nav {
    display: block;
    width: auto;
    order: 2;
  }
  .main-nav ul {
    flex-direction: row;
    gap: 0.25rem;
  }
}

.submenu-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  width: 100%;
  background: none;
  border: none;
  font: inherit;
  text-align: left;
  padding: 0.5rem 0.25rem;
  color: var(--color-text);
  border-radius: var(--radius);
  cursor: pointer;
}
.submenu-toggle:hover {
  background: var(--color-bg);
  color: var(--color-primary);
}
.submenu-toggle svg { width: 16px; height: 16px; transition: transform 0.15s; }
.has-submenu.is-open .submenu-toggle svg { transform: rotate(180deg); }

.main-nav ul.submenu {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0.75rem;
  display: none;
}
.main-nav .has-submenu.is-open ul.submenu { display: flex; }
.submenu a {
  display: block;
  padding: 0.45rem 0.25rem;
  color: var(--color-text);
  border-radius: var(--radius);
}
.submenu a:hover {
  background: var(--color-bg);
  text-decoration: none;
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .has-submenu { position: relative; }
  .main-nav ul.submenu {
    flex-direction: column;
    position: absolute;
    right: 0;
    top: 100%;
    min-width: 170px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 0.35rem;
    z-index: 200;
  }
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  font-size: 0.85rem;
  padding: 0.75rem 0;
  color: var(--color-text-light);
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
}
.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.35rem;
  color: var(--color-border);
}
.breadcrumbs a { color: var(--color-text-light); }
.breadcrumbs [aria-current="page"] { color: var(--color-primary); font-weight: 600; }

/* ---------- Main / Article ---------- */
main {
  display: block;
  min-height: 60vh;
}

article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.intro {
  font-size: 1.05rem;
  color: var(--color-text-light);
}

.blog-meta {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: -0.5rem;
}

/* ---------- Calculadora ---------- */
.calculadora {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin: 1.5rem 0;
}

.diagrama {
  text-align: center;
  margin-bottom: 1rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 0.75rem;
}
.diagrama svg {
  width: 100%;
  max-width: 480px;
}

.formulas-box {
  background: #EEF2FF;
  border-left: 4px solid var(--color-primary);
  border-radius: 4px;
  padding: 0.85rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
  overflow-x: auto;
}
.formulas-box code, .fórmula {
  font-family: "Courier New", monospace;
  font-weight: 600;
  color: var(--color-secondary);
}

form.form-calculadora {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 640px) {
  form.form-calculadora {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  form.form-calculadora {
    grid-template-columns: repeat(3, 1fr);
  }
}

.campo {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.campo label {
  font-weight: 600;
  font-size: 0.9rem;
}
.campo .unidad {
  font-weight: 400;
  color: var(--color-text-light);
}
.campo input, .campo select {
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-main);
  background: var(--color-surface);
  color: var(--color-text);
}
.campo input:focus, .campo select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.campo .error-msg {
  color: var(--color-danger);
  font-size: 0.8rem;
  min-height: 1rem;
}

.acciones-form {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
}
.btn:hover {
  background: var(--color-secondary);
  text-decoration: none;
}
.btn-secundario {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-secundario:hover {
  background: #EEF2FF;
  color: var(--color-primary);
}

.resultados {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin-top: 0.5rem;
}
@media (min-width: 640px) {
  .resultados { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .resultados { grid-template-columns: repeat(3, 1fr); }
}
.resultados:empty { margin-top: 0; }

.resultado-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 5px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  box-shadow: var(--shadow);
}
.resultado-card--positivo { border-left-color: var(--color-success); }
.resultado-card--critico { border-left-color: var(--color-danger); }
.resultado-valor {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
}
.resultado-card--positivo .resultado-valor { color: var(--color-success); }
.resultado-card--critico .resultado-valor { color: var(--color-danger); }
.resultado-unidad {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-left: 0.25rem;
}
.resultado-descripcion {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

.tabla-dinamica {
  grid-column: 1 / -1;
  overflow-x: auto;
}
.tabla-dinamica table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.tabla-dinamica th, .tabla-dinamica td {
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.5rem;
  text-align: left;
}
.tabla-dinamica input {
  width: 100%;
  padding: 0.3rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}
.tabla-dinamica .quitar-fila {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
  border-radius: 4px;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

/* ---------- Contenido SEO ---------- */
.contenido-seo h2:first-child {
  margin-top: 0.5rem;
}
.contenido-seo table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
.contenido-seo th, .contenido-seo td {
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  text-align: left;
}
.contenido-seo th {
  background: var(--color-bg);
}
.ejemplo-resuelto {
  background: var(--color-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
}

/* ---------- Cards relacionadas / categorías ---------- */
.grid-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1rem 0;
}
@media (min-width: 640px) {
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .grid-cards { grid-template-columns: repeat(3, 1fr); }
}

.card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.card:hover {
  text-decoration: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 0.35rem;
  color: var(--color-primary);
}
.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
}
.card .card-icono {
  width: 32px;
  height: 32px;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

/* ---------- Home hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  border-radius: var(--radius);
  padding: 2rem 1.25rem;
  margin-bottom: 2rem;
  text-align: center;
}
.hero h1 {
  color: #fff;
  font-size: 1.8rem;
}
.hero p {
  color: #E0E7FF;
  max-width: 640px;
  margin: 0 auto 1rem;
}
.hero .stat-bar {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.hero .stat-bar strong {
  display: block;
  font-size: 1.4rem;
}
.hero .stat-bar span {
  font-size: 0.8rem;
  color: #C7D2FE;
}

.categorias-home {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}
@media (min-width: 640px) {
  .categorias-home { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .categorias-home { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-text);
  color: #CBD5E1;
  margin-top: 3rem;
}
.site-footer .container {
  padding-top: 2.5rem;
  padding-bottom: 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .site-footer .container {
    grid-template-columns: repeat(4, 1fr);
  }
}
.site-footer h3 {
  color: #fff;
  font-size: 0.95rem;
  margin: 0 0 0.75rem;
}
.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-footer li {
  margin-bottom: 0.4rem;
}
.site-footer a {
  color: #CBD5E1;
  font-size: 0.9rem;
}
.site-footer a:hover {
  color: #fff;
}
.footer-bottom {
  border-top: 1px solid #334155;
  text-align: center;
  padding: 1rem;
  font-size: 0.8rem;
  color: #94A3B8;
}

/* ---------- Páginas legales / formularios de contacto ---------- */
.form-contacto {
  display: grid;
  gap: 1rem;
  max-width: 560px;
}
.form-contacto .campo input,
.form-contacto .campo textarea {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 1rem;
}
.aviso {
  background: var(--color-success-bg);
  border-left: 4px solid var(--color-success);
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin: 1rem 0;
}

.badge {
  display: inline-block;
  background: var(--color-success-bg);
  color: var(--color-success);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  margin-left: 0.5rem;
}

.oculto {
  display: none !important;
}

/* ---------- Panel de busqueda ---------- */
.search-panel {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(15, 23, 42, 0.5);
  padding: 4vh 1rem;
  overflow-y: auto;
}
.search-panel__caja {
  max-width: 640px;
  margin: 0 auto;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  padding: 1rem;
}
.search-panel__input {
  width: 100%;
  font-size: 1.1rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.search-panel__resultados {
  margin-top: 0.75rem;
  max-height: 60vh;
  overflow-y: auto;
}
.search-resultado {
  display: block;
  padding: 0.6rem 0.5rem;
  border-radius: var(--radius);
  color: var(--color-text);
}
.search-resultado:hover {
  background: var(--color-bg);
  text-decoration: none;
}
.search-resultado .search-resultado__cat {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
}
.search-resultado h4 {
  margin: 0.1rem 0;
  font-size: 1rem;
}
.search-resultado p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-light);
}
.search-panel__vacio {
  padding: 0.6rem 0.5rem;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ---------- Banner de cookies ---------- */
.cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  background: var(--color-text);
  box-shadow: 0 -2px 12px rgba(15, 23, 42, 0.25);
}
.cookie-banner__inner {
  padding-top: 1rem;
  padding-bottom: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.cookie-banner__inner p {
  margin: 0;
  font-size: 0.85rem;
  color: #CBD5E1;
  flex: 1 1 320px;
}
.cookie-banner__inner a {
  color: #fff;
  text-decoration: underline;
}
.cookie-banner__botones {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.cookie-banner__botones .btn {
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
}
.cookie-banner__botones .btn-secundario {
  background: transparent;
  color: #E2E8F0;
  border: 1px solid #475569;
}
.cookie-banner__botones .btn-secundario:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

/* ---------- Impresion / Guardar PDF ---------- */
@media print {
  .site-header,
  .site-footer,
  .breadcrumbs,
  .cookie-banner,
  .search-panel,
  .skip-link,
  .acciones-form,
  .grid-cards {
    display: none !important;
  }
  body {
    background: #fff;
  }
  .calculadora {
    background: none;
    border: none;
    padding: 0;
  }
  a {
    color: inherit;
    text-decoration: none;
  }
}