/* ============================================================
   NUMIKOI.AI — main.css
   Variables, Reset, Tipografía, Grid, Utilidades
   ============================================================ */

/* Google Fonts — Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ============================================================
   VARIABLES CSS
   ============================================================ */
:root {
  /* Colores de marca */
  --color-navy-dark:    #11224e;
  --color-navy:         #1a3b70;
  --color-orange:       #f88125;
  --color-white:        #ffffff;

  /* Neutros */
  --color-gray-50:      #f8f9fb;
  --color-gray-100:     #f0f2f7;
  --color-gray-200:     #dde2ee;
  --color-gray-500:     #6b7a99;
  --color-gray-700:     #3d4d6e;
  --color-gray-900:     #1a2236;

  /* Semánticos */
  --color-orange-light: #fff3e8;
  --color-navy-light:   #e8edf7;
  --color-success:      #1a7f5a;
  --color-error:        #dc3545;
  --color-footer-bg:    #0d1a3a;

  /* Espaciado */
  --space-1:   4px;
  --space-2:   8px;
  --space-3:   12px;
  --space-4:   16px;
  --space-6:   24px;
  --space-8:   32px;
  --space-10:  40px;
  --space-12:  48px;
  --space-16:  64px;
  --space-24:  96px;
  --space-32:  128px;

  /* Tipografía */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  /* Sombras */
  --shadow-sm: 0 1px 3px rgba(17, 34, 78, 0.08);
  --shadow-md: 0 4px 16px rgba(17, 34, 78, 0.10);
  --shadow-lg: 0 8px 32px rgba(17, 34, 78, 0.14);
  --shadow-xl: 0 16px 48px rgba(17, 34, 78, 0.18);

  /* Transiciones */
  --transition-fast: 0.2s ease;
  --transition-base: 0.25s ease;

  /* Layout */
  --container-max: 1200px;
  --nav-height-desktop: 72px;
  --nav-height-mobile:  64px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-gray-900);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font-family: var(--font-family);
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: var(--font-family);
  font-size: 16px;
}

/* ============================================================
   TIPOGRAFÍA
   ============================================================ */
h1 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
}

h4 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

p {
  line-height: 1.65;
}

.text-lg {
  font-size: 18px;
  line-height: 1.65;
}

.text-sm {
  font-size: 14px;
  line-height: 1.6;
}

.text-xs {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
}

.text-center { text-align: center; }
.text-white   { color: var(--color-white); }
.text-navy    { color: var(--color-navy); }
.text-orange  { color: var(--color-orange); }
.text-muted   { color: var(--color-gray-500); }

@media (min-width: 1024px) {
  h1 { font-size: 52px; line-height: 1.1; }
  h2 { font-size: 36px; line-height: 1.2; }
  h3 { font-size: 24px; line-height: 1.3; }
}

/* ============================================================
   GRID / LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}

@media (min-width: 1280px) {
  .container {
    padding-left: 48px;
    padding-right: 48px;
  }
}

/* Grid utilitario */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Flexbox utilitario */
.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.items-center  { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2         { gap: var(--space-2); }
.gap-4         { gap: var(--space-4); }
.gap-6         { gap: var(--space-6); }
.gap-8         { gap: var(--space-8); }

/* ============================================================
   SECCIONES
   ============================================================ */
.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section-sm {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

@media (min-width: 1024px) {
  .section {
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
  }
  .section-sm {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* Fondos de sección */
.bg-white    { background-color: var(--color-white); }
.bg-gray     { background-color: var(--color-gray-50); }
.bg-navy     { background-color: var(--color-navy-dark); }

/* ============================================================
   UTILIDADES
   ============================================================ */

/* Visibilidad accesible */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Animaciones reducidas por preferencia */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* Separador decorativo */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-orange);
  margin-bottom: var(--space-4);
}

.section-intro {
  max-width: 640px;
}

.section-intro.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-intro p {
  margin-top: var(--space-4);
  color: var(--color-gray-700);
  font-size: 18px;
}

/* Iconos SVG inline */
.icon {
  display: inline-block;
  flex-shrink: 0;
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background-color: rgba(248, 129, 37, 0.12);
  border: 1px solid rgba(248, 129, 37, 0.4);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-orange);
  letter-spacing: 0.01em;
}

.badge-popular {
  background-color: var(--color-orange);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: none;
}

/* Avatar con iniciales */
.avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-dark) 100%);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 700;
  flex-shrink: 0;
}

.avatar-lg {
  width: 80px;
  height: 80px;
  font-size: 24px;
}

/* Divisor */
.divider {
  border: none;
  border-top: 1px solid var(--color-gray-200);
  margin: var(--space-8) 0;
}

/* Check icon verde */
.check-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: 15px;
  color: var(--color-gray-700);
  line-height: 1.6;
}

.check-list li::before {
  content: '';
  display: block;
  width: 20px;
  height: 20px;
  min-width: 20px;
  background-color: var(--color-success);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
  margin-top: 2px;
}