/* ════════════════════════════════════════════════════════════
   style.css — Calculadora de Ahorros
   Diseño premium: fondo claro, glassmorphism, Inter font
   ════════════════════════════════════════════════════════════ */

/* ── 1. Variables de diseño ───────────────────────────────── */
:root {
  /* Colores primarios */
  --color-bg:        #f0f4ff;
  --color-bg-panel:  #ffffff;
  --color-border:    #e2e8f4;

  /* Marca */
  --color-primary:   #2563eb;
  --color-primary-h: #1d4ed8;
  --color-accent:    #10b981;
  --color-warn:      #f59e0b;
  --color-danger:    #ef4444;

  /* Texto */
  --color-text:      #1e293b;
  --color-text-muted:#64748b;
  --color-text-light:#94a3b8;

  /* Tarjetas */
  --card-final:      #2563eb;
  --card-principal:  #7c3aed;
  --card-intereses:  #10b981;
  --card-aportaciones: #f59e0b;
  --card-años:       #0ea5e9;

  /* Sombras */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 20px rgba(37,99,235,.10);
  --shadow-lg: 0 10px 40px rgba(37,99,235,.15);

  /* Radios y espaciado */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --space-xs:  6px;
  --space-sm:  12px;
  --space-md:  20px;
  --space-lg:  32px;
  --space-xl:  48px;

  /* Tipografía */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --transition:  0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── 2. Reset & base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  font-size: 15px;
}

/* ── 3. Header ────────────────────────────────────────────── */
.app-header {
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 50%, #3b82f6 100%);
  color: white;
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-icon {
  font-size: 2rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,.3));
}

.app-header h1 {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.header-subtitle {
  font-size: 0.8rem;
  opacity: 0.8;
  font-weight: 400;
}

/* ── 4. Layout principal ──────────────────────────────────── */
.app-main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ── 5. Paneles ───────────────────────────────────────────── */
.panel {
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
}

.panel-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.panel-title::before {
  content: '';
  display: block;
  width: 4px;
  height: 1.2em;
  background: var(--color-primary);
  border-radius: 4px;
  flex-shrink: 0;
}

/* ── 6. Grid de inputs ────────────────────────────────────── */
.inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.input-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.input-hint {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix {
  position: absolute;
  left: 12px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  pointer-events: none;
  user-select: none;
  z-index: 1;
  width: 20px;
  text-align: center;
}

.input-wrapper input[type="number"] {
  width: 100%;
  padding: 10px 14px 10px 42px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  background: #f8faff;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  -moz-appearance: textfield;
  outline: none;
}

.input-wrapper input[type="number"]::-webkit-outer-spin-button,
.input-wrapper input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

.input-wrapper input[type="number"]:focus {
  border-color: var(--color-primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}

.input-wrapper input[type="number"].input--error {
  border-color: var(--color-danger);
  background: #fff5f5;
  box-shadow: 0 0 0 3px rgba(239,68,68,.12);
}

.input-error {
  font-size: 0.75rem;
  color: var(--color-danger);
  min-height: 1em;
  font-weight: 500;
}

.badge-optional {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 20px;
  background: #e0e7ff;
  color: #3730a3;
  font-size: 0.65rem;
  font-weight: 600;
  vertical-align: middle;
  margin-left: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── 7. Fallback section ──────────────────────────────────── */
.fallback-section {
  background: #fffbeb;
  border: 1.5px solid #fde68a;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.alert-warning {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  font-size: 0.85rem;
  color: #92400e;
}

.alert-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 1px; }

.input-group--inline {
  max-width: 260px;
}

/* ── 8. Botones ───────────────────────────────────────────── */
.btn-row {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-md);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-h));
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 11px 28px;
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(37,99,235,.35);
  transition: all var(--transition);
  letter-spacing: 0.01em;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,.4);
}

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

.btn-primary:focus-visible {
  outline: 3px solid rgba(37,99,235,.5);
  outline-offset: 3px;
}

.btn-secondary {
  background: rgba(255,255,255,0.15);
  color: white;
  border: 1.5px solid rgba(255,255,255,0.4);
  border-radius: var(--radius-sm);
  padding: 8px 18px;
  font-family: var(--font-family);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.25);
  transform: translateY(-1px);
}

.btn-secondary:focus-visible {
  outline: 2px solid white;
  outline-offset: 2px;
}

/* ── 9. Área de resultados (animación) ────────────────────── */
.results-area {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  animation: fadeInUp 0.4s ease both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 10. Badge meta ───────────────────────────────────────── */
.meta-badge-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.meta-badge.badge--si {
  background: #d1fae5;
  color: #065f46;
  border: 1.5px solid #6ee7b7;
}

.meta-badge.badge--no {
  background: #fee2e2;
  color: #991b1b;
  border: 1.5px solid #fca5a5;
}

.meta-detail {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ── 11. Tarjetas de resumen ──────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: var(--space-md);
}

.card {
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  background: #fafbff;
}

.card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  border-radius: 4px 0 0 4px;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card--final::before       { background: var(--card-final); }
.card--principal::before   { background: var(--card-principal); }
.card--intereses::before   { background: var(--card-intereses); }
.card--aportaciones::before{ background: var(--card-aportaciones); }
.card--años::before        { background: var(--card-años); }

.card-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.card-body { flex: 1; }

.card-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 3px;
}

.card-value {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  display: block;
}

/* ── 12. Gráficos ─────────────────────────────────────────── */
.charts-panel { }

.charts-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.chart-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  background: linear-gradient(145deg, #f8faff, #f0f4ff);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-md);
  transition: box-shadow var(--transition);
}

.chart-figure:hover { box-shadow: var(--shadow-md); }

.chart-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
  display: flex;
  align-items: center;
  gap: 6px;
}

.chart-title-icon { font-size: 1.1rem; }

.chart-wrap {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-wrap canvas { max-width: 100%; max-height: 100%; }

/* ── 13. Tabla accesible ──────────────────────────────────── */
.tabla-accesible {
  margin-top: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.tabla-accesible summary {
  padding: var(--space-sm) var(--space-md);
  background: #f1f5fd;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-primary);
  user-select: none;
  transition: background var(--transition);
}

.tabla-accesible summary:hover { background: #e0e9ff; }

.tabla-accesible table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.tabla-accesible th,
.tabla-accesible td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.tabla-accesible thead th {
  background: #eef2fb;
  font-weight: 700;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tabla-accesible tbody tr:last-child td { border-bottom: none; }
.tabla-accesible tbody tr:hover td { background: #f8faff; }

/* ── 14. Footer ───────────────────────────────────────────── */
.app-footer {
  text-align: center;
  padding: var(--space-md);
  color: var(--color-text-light);
  font-size: 0.78rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-panel);
}

/* ── 15. Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
  .app-main { padding: var(--space-md) var(--space-sm); }
  .panel { padding: var(--space-md); }
  .inputs-grid { grid-template-columns: 1fr 1fr; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .charts-row { grid-template-columns: 1fr; }
  .header-inner { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }
  .btn-secondary { align-self: flex-start; }
}

@media (max-width: 420px) {
  .inputs-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
}

/* ── 16. Focus visible global ─────────────────────────────── */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}