/* ============================================================
   CALCULADORA IRPF ESPAÑA 2024 — Hoja de estilos principal
   Diseño responsive profesional. Sin dependencias externas.
   Fuentes: Google Fonts (Inter) — se cargan en el HTML.
   ============================================================ */

/* ── Variables de diseño ─────────────────────────────────── */
:root {
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-50:  #eff6ff;
  --blue-100: #dbeafe;

  --green-500:  #10b981;
  --green-50:   #ecfdf5;
  --green-100:  #d1fae5;

  --orange-500: #f97316;
  --orange-50:  #fff7ed;

  --red-400:    #f87171;
  --red-500:    #ef4444;
  --red-50:     #fef2f2;

  --slate-50:   #f8fafc;
  --slate-100:  #f1f5f9;
  --slate-200:  #e2e8f0;
  --slate-300:  #cbd5e1;
  --slate-400:  #94a3b8;
  --slate-500:  #64748b;
  --slate-600:  #475569;
  --slate-700:  #334155;
  --slate-800:  #1e293b;
  --slate-900:  #0f172a;
  --white:      #ffffff;

  --amber-50:   #fffbeb;
  --amber-600:  #d97706;
  --amber-100:  #fef3c7;

  --violet-500: #8b5cf6;
  --violet-50:  #f5f3ff;

  --font:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm:  6px;
  --radius:     10px;
  --radius-lg:  14px;
  --radius-xl:  20px;
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow:     0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --transition: all .2s ease;
}

/* ── Reset y base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--slate-50);
  color: var(--slate-900);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

img, svg { display: block; max-width: 100%; }

/* ── Utilidades ───────────────────────────────────────────── */
.hidden    { display: none !important; }
.sr-only   { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-muted  { color: var(--slate-400); }
.text-danger { color: var(--red-500); font-weight: 600; }

/* ── Encabezado fijo ──────────────────────────────────────── */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: .9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: .65rem;
  text-decoration: none;
}

.logo-icon {
  width: 36px; height: 36px;
  background: var(--blue-600);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--white);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--slate-900);
}

.logo-sub {
  font-size: .75rem;
  color: var(--slate-400);
  font-weight: 400;
  margin-left: .4rem;
}

.badge-actualizado {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .7rem;
  font-weight: 600;
  color: #065f46;
  background: var(--green-50);
  border: 1px solid var(--green-100);
  padding: .3rem .75rem;
  border-radius: 999px;
}

.badge-dot {
  width: 7px; height: 7px;
  background: var(--green-500);
  border-radius: 50%;
  animation: pulso 2s infinite;
}

@keyframes pulso {
  0%, 100% { opacity: 1; }
  50%       { opacity: .4; }
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #4f46e5 100%);
  color: var(--white);
  padding: 3rem 1.25rem 3.5rem;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .75rem;
  font-weight: 600;
  color: rgba(255,255,255,.85);
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  padding: .35rem .9rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: .85rem;
  max-width: 620px;
}

.hero h1 em {
  font-style: normal;
  color: #bfdbfe; /* blue-200 */
}

.hero p {
  font-size: 1rem;
  color: #bfdbfe;
  max-width: 520px;
  line-height: 1.65;
}

/* ── Layout principal ─────────────────────────────────────── */
.main {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1.25rem;
  display: grid;
  grid-template-columns: 370px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 860px) {
  .main { grid-template-columns: 1fr; }
}

/* ── Card base ────────────────────────────────────────────── */
.card {
  background: var(--white);
  border: 1px solid var(--slate-100);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

/* ── Formulario ───────────────────────────────────────────── */
.form-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--slate-100);
  margin-bottom: 1.5rem;
}

.form-icon {
  width: 36px; height: 36px;
  background: var(--blue-600);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--white);
  font-size: 1rem;
  flex-shrink: 0;
}

.form-title   { font-size: .95rem; font-weight: 700; color: var(--slate-900); }
.form-subtitle{ font-size: .75rem; color: var(--slate-400); }

.campo { margin-bottom: 1.4rem; }

.campo label {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .82rem;
  font-weight: 600;
  color: var(--slate-700);
  margin-bottom: .5rem;
}

/* Input de texto */
.input-salario-wrap {
  position: relative;
}

.input-salario-wrap input[type="text"] {
  width: 100%;
  padding: .75rem 2.5rem .75rem 1rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--slate-900);
  background: var(--slate-50);
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-lg);
  outline: none;
  transition: var(--transition);
  font-family: var(--font);
}

.input-salario-wrap input[type="text"]:focus {
  border-color: var(--blue-600);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.input-euro {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--slate-400);
  font-weight: 600;
  font-size: .9rem;
  pointer-events: none;
}

/* Slider */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 5px;
  border-radius: 999px;
  background: var(--slate-200);
  outline: none;
  margin: .75rem 0 .3rem;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--blue-600);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--blue-600);
  cursor: pointer;
  transition: box-shadow .15s;
}

.slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px rgba(37,99,235,.2);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: .68rem;
  color: var(--slate-400);
}

/* Botones de opción (radio) */
.opciones-grid {
  display: grid;
  gap: .5rem;
}

.opciones-grid.cols-2 { grid-template-columns: 1fr 1fr; }

.opcion-radio { display: none; }

.opcion-label {
  display: block;
  text-align: center;
  padding: .6rem 1rem;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-lg);
  font-size: .82rem;
  font-weight: 600;
  color: var(--slate-600);
  background: var(--slate-50);
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}

.opcion-label:hover {
  border-color: var(--blue-600);
  color: var(--blue-600);
}

.opcion-radio:checked + .opcion-label {
  background: var(--blue-600);
  color: var(--white);
  border-color: var(--blue-600);
  box-shadow: var(--shadow-sm);
}

/* Contador de hijos */
.contador-hijos {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.btn-contador {
  width: 38px; height: 38px;
  border-radius: var(--radius);
  background: var(--slate-100);
  border: none;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--slate-700);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}

.btn-contador:hover { background: var(--slate-200); }

.hijos-valor {
  flex: 1;
  text-align: center;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--slate-900);
  border: none;
  background: transparent;
  width: 40px;
  font-family: var(--font);
}

/* Select de CCAA */
select {
  width: 100%;
  padding: .7rem 2.5rem .7rem 1rem;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-lg);
  background: var(--slate-50) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2394a3b8'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z'/%3E%3C/svg%3E") no-repeat right .75rem center / 16px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--slate-800);
  font-family: var(--font);
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: var(--transition);
}

select:focus {
  border-color: var(--blue-600);
  background-color: var(--white);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

/* Info box */
.info-box {
  display: flex;
  gap: .6rem;
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  border-radius: var(--radius-lg);
  padding: .9rem;
  margin-top: 1rem;
}

.info-icon { font-size: 1rem; flex-shrink: 0; }
.info-texto { font-size: .75rem; color: #1e40af; line-height: 1.55; }
.info-texto strong { font-weight: 700; display: block; margin-bottom: .25rem; }

/* Aviso foral */
.aviso-foral {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  background: var(--amber-50);
  border: 1px solid var(--amber-100);
  border-radius: var(--radius);
  padding: .7rem .9rem;
  font-size: .75rem;
  color: var(--amber-600);
  font-weight: 500;
  margin-top: .6rem;
}

/* ── Columna de resultados ────────────────────────────────── */
.resultados-col { display: flex; flex-direction: column; gap: 1.2rem; }

/* Tarjetas de resultado */
.resultado-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .85rem;
}

.res-card {
  background: var(--white);
  border: 1px solid var(--slate-100);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
  position: relative;
  overflow: hidden;
}

.res-card.destacada {
  grid-column: span 2;
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
  border-color: #a7f3d0;
}

.res-card-icono {
  width: 34px; height: 34px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: .95rem;
  align-self: flex-end;
  position: absolute;
  top: 1.1rem; right: 1.1rem;
}

.res-etiqueta {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.res-valor {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--slate-900);
  transition: color .3s;
}

.res-card.destacada .res-valor { font-size: 1.7rem; color: #065f46; }

.res-sub {
  font-size: .72rem;
  color: var(--slate-400);
}

/* Animación al actualizar */
@keyframes flash {
  0%   { color: var(--blue-600); }
  100% { color: inherit; }
}

.valor-actualizado { animation: flash .5s ease; }

/* Barra de distribución */
.barra-titulo { font-size: .82rem; font-weight: 700; color: var(--slate-700); margin-bottom: .65rem; }
.barra-track  { display: flex; border-radius: 999px; overflow: hidden; height: 18px; }
.barra-segmento {
  height: 100%;
  transition: width .7s ease;
  min-width: 0;
}

.barra-neto   { background: var(--green-500); }
.barra-irpf   { background: var(--red-400); }
.barra-ss     { background: var(--orange-500); }

.barra-leyenda {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: .7rem;
}

.leyenda-item {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .75rem;
  color: var(--slate-600);
}

.leyenda-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
}

.leyenda-item strong { font-weight: 700; color: var(--slate-800); }

/* Desglose */
.desglose-lista { list-style: none; }

.desglose-lista li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .82rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--slate-100);
}

.desglose-lista li:last-child { border-bottom: none; }

.desglose-lista .etiqueta { color: var(--slate-500); }
.desglose-lista .valor    { font-weight: 600; }
.desglose-lista .resta    { color: var(--orange-500); font-weight: 600; }
.desglose-lista .total    { color: var(--green-500); font-weight: 800; font-size: .9rem; }
.desglose-lista .divisor  { border-top: 2px solid var(--slate-200); padding-top: .7rem; margin-top: .2rem; }

/* Tramos IRPF */
.tabla-tramos {
  width: 100%;
  border-collapse: collapse;
  font-size: .78rem;
}

.tabla-tramos thead th {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--slate-400);
  padding: .4rem .6rem;
  border-bottom: 1px solid var(--slate-200);
  text-align: left;
}

.tabla-tramos thead th:last-child,
.tabla-tramos thead th:nth-child(2) { text-align: center; }
.tabla-tramos thead th:nth-child(3),
.tabla-tramos thead th:nth-child(4) { text-align: right; }

.tabla-tramos tbody td {
  padding: .45rem .6rem;
  color: var(--slate-700);
  border-bottom: 1px solid var(--slate-100);
}

.tabla-tramos tbody tr:last-child td { border-bottom: none; }

/* ── Gráficos ─────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: .3rem;
  background: var(--slate-100);
  border-radius: var(--radius-lg);
  padding: .25rem;
  width: fit-content;
  margin-bottom: 1.2rem;
}

.tab-btn {
  padding: .45rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-size: .82rem;
  font-weight: 600;
  color: var(--slate-500);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: .4rem;
}

.tab-btn:hover { color: var(--slate-700); }

.tab-btn.activo {
  background: var(--white);
  color: var(--slate-900);
  box-shadow: var(--shadow-sm);
}

.chart-wrap { height: 240px; position: relative; }

.indicadores { display: flex; flex-direction: column; gap: 1rem; margin-top: .5rem; }

.indicador-label {
  display: flex;
  justify-content: space-between;
  font-size: .78rem;
  color: var(--slate-600);
  margin-bottom: .3rem;
}

.indicador-label strong { font-weight: 700; color: var(--slate-800); }

.indicador-track {
  height: 8px;
  background: var(--slate-200);
  border-radius: 999px;
  overflow: hidden;
}

.indicador-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green-500), var(--orange-500) 55%, var(--red-500));
  transition: width .7s ease;
}

.indicador-rangos {
  display: flex;
  justify-content: space-between;
  font-size: .65rem;
  color: var(--slate-400);
  margin-top: .2rem;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  max-width: 1100px;
  margin: 2rem auto 3rem;
  padding: 1.5rem 1.25rem 0;
  border-top: 1px solid var(--slate-200);
  text-align: center;
}

.footer p {
  font-size: .72rem;
  color: var(--slate-400);
  line-height: 1.6;
  max-width: 700px;
  margin: 0 auto .4rem;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 600px) {
  .resultado-grid { grid-template-columns: 1fr; }
  .res-card.destacada { grid-column: span 1; }
  .hero { padding: 2rem 1rem 2.5rem; }
  .header-inner { padding: .75rem 1rem; }
  .logo-sub,
  .badge-actualizado { display: none; }
}

@media (max-width: 400px) {
  .opciones-grid.cols-2 { grid-template-columns: 1fr; }
}

/* ── Loading overlay ──────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 9999;
  font-size: .9rem;
  color: var(--slate-500);
}

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--slate-200);
  border-top-color: var(--blue-600);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Desglose helpers ─────────────────────────────────────── */
.valor.azul, .azul { color: var(--blue-600); }
.valor.negrita, .negrita { font-weight: 700; color: var(--slate-800); }

/* ── Tabla nota ───────────────────────────────────────────── */
.tabla-nota {
  font-size: .72rem;
  color: var(--slate-400);
  margin-top: .75rem;
  padding-top: .5rem;
  border-top: 1px solid var(--slate-100);
}

/* ── Chart caption ────────────────────────────────────────── */
.chart-caption {
  font-size: .78rem;
  color: var(--slate-400);
  text-align: center;
  margin-bottom: .75rem;
}

/* ── Footer tech note ─────────────────────────────────────── */
.footer-tech {
  margin-top: .6rem;
  color: var(--slate-300) !important;
}

/* ── Select nativo mejorado ───────────────────────────────── */
select {
  width: 100%;
  padding: .62rem .9rem;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: .875rem;
  color: var(--slate-700);
  background: var(--white);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  cursor: pointer;
  transition: border-color .15s;
}

select:focus {
  outline: none;
  border-color: var(--blue-600);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}