/*
  Canasta Inteligente — Estilos móviles elegantes, intuitivos y 100% responsive
  - Mobile-first
  - Animaciones suaves
  - Modo claro/oscuro (controlado por body.dark desde app.js)
  - Componentes: header, nav, secciones, formularios, botones, tarjetas, gráficos, alertas
*/

/* ====== Variables ====== */
:root {
  --ff-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial;
  --radius: 16px;
  --radius-lg: 22px;
  --shadow-sm: 0 6px 14px rgba(0,0,0,.08);
  --shadow-md: 0 10px 24px rgba(0,0,0,.12);
  --shadow-lg: 0 18px 40px rgba(0,0,0,.16);
  --clr-bg: #f7f7fb;
  --clr-surface: #ffffff;
  --clr-surface-2: #f2f3f7;
  --clr-text: #0f172a;
  --clr-text-weak: #475569;
  --clr-border: #e5e7eb;
  --clr-primary: #00b894;
  --clr-primary-weak: rgba(0,184,148,0.12);
  --clr-accent: #4f46e5;
  --clr-good: #10b981;
  --clr-mid: #f59e0b;
  --clr-bad: #ef4444;
  --grad-header: linear-gradient(135deg, #00b894 0%, #4f46e5 100%);
  --grad-button: linear-gradient(135deg, #4f46e5 0%, #22c55e 100%);
  --inset-bot: env(safe-area-inset-bottom, 0px);
}

body.dark {
  --clr-bg: #0b0f14;
  --clr-surface: #10151b;
  --clr-surface-2: #0f141a;
  --clr-text: #e5f0ff;
  --clr-text-weak: #9fb2c8;
  --clr-border: #1e293b;
  --clr-primary-weak: rgba(0,184,148,0.18);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--ff-sans);
  background: var(--clr-bg);
  color: var(--clr-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, canvas { max-width: 100%; height: auto; }
button, input, select { font-family: inherit; }

/* ====== Header ====== */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 16px clamp(16px, 4vw, 22px);
  background: var(--grad-header);
  color: #fff;
  border-bottom-left-radius: 18px;
  border-bottom-right-radius: 18px;
  box-shadow: var(--shadow-md);
  animation: dropIn .6s ease both;
}
header h1 { margin: 0 0 8px 0; font-size: 1.4rem; }
header nav {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
}
header nav a {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-weight: 600;
  font-size: .92rem;
  color: #f1f5f9;
  background: rgba(255,255,255,.16);
  padding: 10px 12px;
  border-radius: 999px;
  transition: background .2s ease;
}
header nav a:hover { background: rgba(255,255,255,.3); }
#modoToggle {
  position: absolute;
  right: 16px;
  top: 14px;
  border: none;
  background: rgba(255,255,255,.25);
  color: #fff;
  padding: 8px 10px;
  border-radius: 12px;
  backdrop-filter: blur(6px);
}

/* ====== Secciones ====== */
main { padding: 12px clamp(12px, 4vw, 20px) calc(14px + var(--inset-bot)); }
.seccion {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin: 12px 0 18px;
  box-shadow: var(--shadow-sm);
  animation: fadeUp .5s ease both;
}
.seccion h2 { margin-top: 0; font-size: 1.2rem; }
.seccion p { color: var(--clr-text-weak); line-height: 1.5; }

/* ====== Formularios ====== */
.simulador-box {
  display: grid;
  gap: 10px;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 12px;
}
label { font-size: .92rem; color: var(--clr-text-weak); }
input[type="number"], select {
  width: 100%;
  padding: 14px 12px;
  border-radius: 14px;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text);
  transition: box-shadow .2s ease;
}
input:focus, select:focus { box-shadow: 0 0 0 4px var(--clr-primary-weak); }

/* ====== Botones ====== */
button {
  border: none;
  border-radius: 18px;
  color: #0a0a0a;
  font-weight: 700;
  padding: 14px 16px;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: transform .1s ease, filter .2s ease;
}
button:hover { filter: brightness(1.05); }
button:active { transform: scale(.97); }
#btnComenzar { background: var(--grad-button); }
#calcularBtn { background: linear-gradient(135deg, #10b981, #059669); }
#compararBtn { background: linear-gradient(135deg, #0ea5e9, #2563eb); }

/* ====== Productos ====== */
.productos-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 380px) { .productos-grid { grid-template-columns: 1fr 1fr; } }
.producto-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 14px;
  animation: cardPop .4s ease both;
}

/* ====== Filtros Gráfico ====== */
#filtrosRango {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
#filtrosRango label, #filtrosRango select {
  flex: 1 1 45%;
  min-width: 120px;
}
#filtrosRango button#aplicarRango {
  flex-basis: 100%;
  margin-top: 8px;
  text-align: center;
  background: var(--grad-button);
}
@media (min-width: 480px) {
  #filtrosRango { flex-wrap: nowrap; }
  #filtrosRango button#aplicarRango { flex-basis: auto; margin-top: 0; }
}

/* ====== Sistema de ayuda contextual ====== */
.help-icon {
  border: none;
  background: var(--clr-primary);
  color: #000000;
  font-weight: 700;
  border-radius: 50%;
  line-height: 26px;
  text-align: center;
  font-size: 0.9rem;
  cursor: pointer;
  transition: transform 0.2s ease;
}
.help-icon:hover { transform: scale(1.1); }
.help-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 999;
}
.help-content {
  background: var(--clr-surface);
  color: var(--clr-text);
  border-radius: 18px;
  width: 90%; max-width: 380px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

/* ====== Alertas globales (reemplazo de toasts) ====== */
/* ====== Alertas globales (emergentes centradas y responsive) ====== */
.alerta-container {
  position: fixed;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  pointer-events: none;
  z-index: 9999;
}

.alerta {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  padding: 16px 18px;
  border-radius: 18px;
  font-weight: 600;
  font-size: 0.95rem;
  width: 90%;
  max-width: 360px;
  background: var(--clr-surface);
  color: var(--clr-text);
  border-left: 6px solid var(--clr-primary);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  backdrop-filter: blur(8px);
  animation: alertaIn 0.4s ease, alertaFloat 4s ease-in-out infinite alternate;
  pointer-events: all;
}

/* 🌈 Tipos de alerta */
.alerta.exito {
  background: #dcfce7;
  border-left-color: #16a34a;
  color: #065f46;
}

.alerta.error {
  background: #fee2e2;
  border-left-color: #dc2626;
  color: #7f1d1d;
}

.alerta.advertencia {
  background: #fff7ed;
  border-left-color: #f59e0b;
  color: #78350f;
}

.alerta.info {
  background: #e0f2fe;
  border-left-color: #0284c7;
  color: #075985;
}

/* ✨ Animaciones */
@keyframes alertaIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes alertaOut {
  to {
    opacity: 0;
    transform: translateY(-20px) scale(0.9);
  }
}

/* 👋 Pequeño efecto de “flotación” (sube y baja sutilmente mientras está visible) */
@keyframes alertaFloat {
  0% { transform: translateY(0); }
  100% { transform: translateY(-3px); }
}

/* 🌓 Compatibilidad con modo oscuro */
body.dark .alerta {
  background: #1e293b;
  color: #e2e8f0;
  border-left-color: var(--clr-primary);
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

/* 📱 Responsive: Ajuste en pantallas muy pequeñas */
@media (max-width: 400px) {
  .alerta {
    width: 92%;
    font-size: 0.9rem;
    padding: 14px;
  }
}

/* ====== Animaciones ====== */
@keyframes dropIn { from { opacity: 0; transform: translateY(-16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes cardPop { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: translateY(0) scale(1); } }