/* =========================================
   CASCADE LAYERS — orden explícito de prioridad
   Cap 4, Vanilla Web (Firtman)
   Cada layer posterior sobreescribe al anterior
   sin necesidad de aumentar especificidad.
========================================= */
@layer reset, base, layout, components, responsive;


/* =========================================
   @layer reset
   — Normalización base del navegador
========================================= */
@layer reset {
  *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
  html  { scroll-behavior: smooth; }
  body  { line-height: 1.6; -webkit-font-smoothing: antialiased; }
  img   { max-width: 100%; display: block; }
  a     { color: inherit; text-decoration: none; }
  ul    { list-style: none; }
  button { cursor: pointer; border: none; background: none; font-family: inherit; }
}


/* =========================================
   @layer base
   — Design tokens + escala tipográfica
========================================= */
@layer base {

  :root {
    --bg-0:        #0d0d0f;
    --bg-1:        #141416;
    --bg-2:        #1c1c1e;
    --bg-card:     #222224;

    --text-primary:   #f5f5f7;
    --text-secondary: rgba(245, 245, 247, 0.68);
    --text-tertiary:  rgba(245, 245, 247, 0.42);

    color-scheme: dark;

    --accent:        #2997ff;
    --accent-hover:  #0a84ff;
    --accent-subtle: rgba(41, 151, 255, 0.10);
    --accent-border: rgba(41, 151, 255, 0.22);

    --border:       #38383a;
    --border-light: #2c2c2e;

    --font-title: 'Outfit', 'Sweet Sans Pro', system-ui, sans-serif;
    --font-body:  'Manrope', system-ui, sans-serif;

    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;

    --space-xs:  0.5rem;
    --space-sm:  1rem;
    --space-md:  2rem;
    --space-lg:  4rem;
    --space-xl:  7rem;

    --max-w: 1080px;
    --ease:  cubic-bezier(0.4, 0, 0.2, 1);
    --t:     0.22s;
  }

  body {
    font-family: var(--font-body);
    background: var(--bg-0);
    color: var(--text-primary);
  }

  /* Escala tipográfica */
  .eyebrow {
    display: block;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
  }
  .t-xl {
    font-family: var(--font-title);
    font-size: clamp(2.6rem, 5.5vw, 4.8rem);
    font-weight: 800;
    line-height: 1.06;
    letter-spacing: -0.025em;
  }
  .t-lg {
    font-family: var(--font-title);
    font-size: clamp(1.9rem, 3.5vw, 2.9rem);
    font-weight: 700;
    line-height: 1.14;
    letter-spacing: -0.02em;
  }
  .t-md {
    font-family: var(--font-title);
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.25;
  }
  .lead {
    font-size: 1.1rem;
    font-weight: 400;
    line-height: 1.75;
    color: var(--text-secondary);
  }
  .body {
    font-size: 0.975rem;
    line-height: 1.65;
    color: var(--text-secondary);
  }
}


/* =========================================
   @layer layout
   — Contenedores y grilla estructural
========================================= */
@layer layout {

  .container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--space-md);
  }

  .section      { padding: var(--space-xl) 0; }

  .section--light { background: #f5f5f0; color: #121212; }

  .sec-head          { margin-bottom: var(--space-lg); }
  .sec-head--center  { text-align: center; }
  .sec-head .t-lg    { margin-top: 0.2rem; }
}


/* =========================================
   @layer components
   — Todos los componentes UI
========================================= */
@layer components {

  /* --- Buttons --- */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.8rem 1.75rem;
    border-radius: 100px;
    transition:
      background  var(--t) var(--ease),
      border-color var(--t) var(--ease),
      transform   var(--t) var(--ease);
  }
  .btn--primary            { background: var(--accent); color: #fff; }
  .btn--primary:hover      { background: var(--accent-hover); transform: translateY(-2px); }
  .btn--success            { background: #30d158; color: #fff; }
  .btn--ghost              { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }
  .btn--ghost:hover        { border-color: var(--text-secondary); background: var(--bg-2); }

  /* --- Navegación --- */
  .nav {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 200;
    background: rgba(13, 13, 15, 0.82);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border-bottom: 1px solid var(--border-light);
    transition: border-color var(--t) var(--ease);
  }
  .nav--scrolled { border-bottom-color: var(--border); }

  .nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 62px;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--space-md);
  }

  .nav__logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    color: var(--text-primary);
  }
  .nav__logo img {
    display: block;
    width: auto;
    height: 32px;
    object-fit: contain;
  }

  .nav__links {
    display: flex;
    align-items: center;
    gap: 1.75rem;
  }
  .nav__links a:not(.nav__cta) {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: opacity var(--t) var(--ease);
  }
  .nav__links a:not(.nav__cta):hover { opacity: 0.65; }

  .nav__cta {
    font-size: 0.875rem;
    font-weight: 600;
    color: #fff;
    background: var(--accent);
    padding: 0.45rem 1.2rem;
    border-radius: 100px;
    transition: background var(--t) var(--ease);
  }
  .nav__cta:hover { background: var(--accent-hover); opacity: 1; }

  .nav__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
    color: var(--text-primary);
  }
  .nav__burger span {
    display: block;
    width: 22px; height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
  }

  /* drawer mobile — ahora es un <div>, no un <nav> anidado */
  .nav__drawer {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 62px; left: 0; right: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    padding: 1rem var(--space-md) 1.5rem;
  }
  .nav__drawer.open { display: flex; }
  .nav__drawer a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--border-light);
    transition: opacity var(--t) var(--ease);
  }
  .nav__drawer a:hover { opacity: 0.65; }
  .nav__drawer a:last-child { border-bottom: none; }

  /* --- Hero --- */
  .hero {
    background-image: url('images/hero.png');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    padding-top: calc(62px + var(--space-xl));
    padding-bottom: var(--space-xl);
    position: relative;
    overflow: hidden;
  }
  /* overlay oscuro + glow — capa sobre la imagen */
  .hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
      linear-gradient(180deg,
        rgba(13, 13, 15, 0.80) 0%,
        rgba(13, 13, 15, 0.68) 50%,
        rgba(13, 13, 15, 0.88) 100%
      ),
      radial-gradient(ellipse at 50% 0%,
        rgba(41, 151, 255, 0.07) 0%,
        transparent 68%
      );
    z-index: 0;
    pointer-events: none;
  }
  .hero .container { position: relative; z-index: 1; }

  .hero__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
  }
  .hero__eyebrow { margin-bottom: 1.25rem; }
  .hero__title   { margin-bottom: 1.5rem; }
  .hero__lead    { margin-bottom: var(--space-md); max-width: 460px; }
  .hero__actions { display: flex; gap: var(--space-sm); flex-wrap: wrap; }

  .hero__stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-width: 360px;
    margin-left: auto;
  }
  .stat {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: border-color var(--t) var(--ease);
  }
  .stat:hover { border-color: var(--accent-border); }
  .stat--featured {
    background: linear-gradient(135deg,
      rgba(41, 151, 255, 0.13) 0%,
      rgba(41, 151, 255, 0.04) 100%);
    border-color: var(--accent-border);
  }
  .stat__n {
    font-family: var(--font-title);
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
  }
  .stat__label { font-size: 0.875rem; color: var(--text-secondary); }

  /* --- Nosotros --- */
  .nosotros__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
  }
  #nosotros .eyebrow { color: var(--accent); }
  #nosotros .t-lg { color: #121212; }
  .nosotros__copy .t-lg { margin-bottom: 1.5rem; }
  .nosotros__copy p     { font-size: 1.05rem; line-height: 1.75; color: var(--text-secondary); }
  .nosotros__copy p:first-of-type { color: var(--text-primary); }
  .nosotros__copy p + p { margin-top: 1rem; }
  #nosotros .nosotros__copy p { color: #121212; }
  #nosotros .nosotros__copy p:first-of-type { color: #121212; }

  .nosotros__card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-md) 1.5rem;
  }
  #nosotros .nosotros__card {
    background: #ffffff;
    border-color: rgba(18, 18, 18, 0.08);
    box-shadow: 0 18px 40px rgba(18, 18, 18, 0.08);
  }
  .nosotros__quote {
    font-family: var(--font-title);
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.45;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
  }
  #nosotros .nosotros__quote { color: #121212; }
  .nosotros__quote-attr {
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-tertiary);
  }
  #nosotros .nosotros__quote-attr { color: #121212; }

  /* --- Metodología — 4 pilares --- */
  .pillars {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
  }
  .pillar {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem 1.75rem;
    text-align: center;
    transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
  }
  .pillar:hover { border-color: var(--accent-border); transform: translateY(-5px); }
  .pillar__num  {
    font-family: var(--font-title);
    font-size: 2.8rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1;
    margin-bottom: 1.25rem;
  }
  .pillar__name {
    font-family: var(--font-title);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
  }
  .pillar__desc { font-size: 0.88rem; line-height: 1.6; color: var(--text-secondary); }

  .pillars__closing {
    text-align: center;
    margin: 2.25rem auto 0;
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 560px;
  }

  /* --- Diferenciales 2×2 --- */
  .dif-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }
  .dif-card {
    background: var(--bg-2);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 2.25rem;
    text-align: center;
    transition: border-color var(--t) var(--ease);
  }
  .dif-card:hover { border-color: var(--accent-border); }
  .dif-card__icon {
    width: 46px; height: 46px;
    border-radius: var(--radius-xs);
    background: var(--accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.4rem;
  }
  .dif-card__icon svg {
    width: 22px; height: 22px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
  .dif-card__title {
    font-family: var(--font-title);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.7rem;
  }
  .dif-card__text { font-size: 0.95rem; line-height: 1.65; color: var(--text-secondary); }

  /* --- Servicios --- */
  .servicios__layout .t-lg { margin-bottom: 2rem; }
  .servicios__layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: start;
  }
  .servicios__list { display: flex; flex-direction: column; gap: 0.75rem; }
  .servicios__item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.15rem 1.4rem;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    transition: border-color var(--t) var(--ease);
  }
  .servicios__item:hover { border-color: var(--accent-border); }
  .servicios__dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
  }
  .servicios__text { font-size: 0.975rem; font-weight: 500; color: var(--text-primary); }

  .servicios__aside {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    position: sticky;
    top: 78px;
  }
  .servicios__aside .eyebrow { margin-bottom: 0.75rem; }
  .servicios__objetivo {
    font-size: 1.05rem;
    line-height: 1.72;
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
  }

  /* --- Contacto --- */
  .contacto__layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: start;
  }
  .contacto__copy .t-lg { margin-bottom: 0.8rem; }
  .contacto__copy .lead { margin-bottom: 2rem; }

  .info-list { display: flex; flex-direction: column; }
  .info-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.15rem 0;
    border-bottom: 1px solid var(--border-light);
  }
  .info-list > .info-item:first-child { border-top: 1px solid var(--border-light); }
  .info-icon {
    width: 38px; height: 38px;
    border-radius: var(--radius-xs);
    background: var(--accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .info-icon svg {
    width: 18px; height: 18px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
  .info-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 0.15rem;
  }
  .info-value { font-size: 0.975rem; font-weight: 500; color: var(--text-primary); }
  .info-value a {
    color: inherit;
    text-decoration: none;
  }
  .info-value a:hover { text-decoration: underline; }

  .form { display: flex; flex-direction: column; gap: 1.1rem; }
  .form > .btn { align-self: flex-start; }
  .form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
  .form__group { display: flex; flex-direction: column; gap: 0.45rem; }
  .form__label { font-size: 0.82rem; font-weight: 500; color: var(--text-secondary); }
  .form__input,
  .form__textarea {
    width: 100%;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.8rem 1rem;
    font-family: var(--font-body);
    font-size: 0.975rem;
    color: var(--text-primary);
    transition: border-color var(--t) var(--ease);
  }
  .form__input::placeholder,
  .form__textarea::placeholder { color: var(--text-tertiary); }
  .form__input:focus,
  .form__textarea:focus { outline: none; border-color: var(--accent); }
  .form__textarea { resize: vertical; min-height: 130px; }

  /* ---- Secciones con fondo claro: Metodología, Diferenciales, Servicios, Contacto ---- */
  /* background y color vienen de .section--light; aquí solo el separador */
  #metodologia,
  #diferenciales,
  #servicios,
  #contacto {
    border-top: 1px solid rgba(18, 18, 18, 0.08);
  }

  /* Headings de sección */
  #metodologia .t-lg,
  #diferenciales .t-lg,
  #contacto .t-lg { color: #121212; }

  /* Texto secundario de sección */
  #metodologia .pillars__closing { color: #3a3a3c; }

  /* Pilares — fondo blanco */
  #metodologia .pillar {
    background: #ffffff;
    border-color: rgba(18, 18, 18, 0.10);
    box-shadow: 0 4px 16px rgba(18, 18, 18, 0.06);
  }
  #metodologia .pillar:hover { border-color: var(--accent-border); }
  #metodologia .pillar__num  { color: var(--accent); }
  #metodologia .pillar__name { color: #121212; }
  #metodologia .pillar__desc { color: #3a3a3c; }

  /* Dif-cards — fondo blanco */
  #diferenciales .dif-card {
    background: #ffffff;
    border-color: rgba(18, 18, 18, 0.10);
    box-shadow: 0 4px 16px rgba(18, 18, 18, 0.06);
  }
  #diferenciales .dif-card:hover { border-color: var(--accent-border); }
  #diferenciales .dif-card__title { color: #121212; }
  #diferenciales .dif-card__text  { color: #3a3a3c; }

  /* Servicios — lista e items */
  #servicios .t-lg            { color: #121212; }
  #servicios .servicios__item {
    background: #ffffff;
    border-color: rgba(18, 18, 18, 0.10);
    box-shadow: 0 4px 16px rgba(18, 18, 18, 0.06);
  }
  #servicios .servicios__item:hover { border-color: var(--accent-border); }
  #servicios .servicios__text { color: #121212; }
  #servicios .servicios__aside {
    background: #ffffff;
    border-color: rgba(18, 18, 18, 0.10);
    box-shadow: 0 4px 16px rgba(18, 18, 18, 0.06);
  }
  #servicios .servicios__objetivo { color: #3a3a3c; }

  /* Contacto — textos e info */
  #contacto .lead        { color: #3a3a3c; }
  #contacto .info-label  { color: #6e6e73; }
  #contacto .info-value  { color: #121212; }
  #contacto .info-item   { border-color: rgba(18, 18, 18, 0.10); }
  #contacto .info-list > .info-item:first-child { border-color: rgba(18, 18, 18, 0.10); }

  /* Contacto — formulario */
  #contacto .form__label { color: #3a3a3c; }
  #contacto .form__input,
  #contacto .form__textarea {
    background: #ffffff;
    border-color: rgba(18, 18, 18, 0.15);
    color: #121212;
  }
  #contacto .form__input::placeholder,
  #contacto .form__textarea::placeholder { color: #a1a1aa; }
  #contacto .form__input:focus,
  #contacto .form__textarea:focus { border-color: var(--accent); }

  /* --- Footer --- */
  .footer {
    background: var(--bg-1);
    border-top: 1px solid var(--border-light);
    padding: var(--space-lg) 0 var(--space-md);
  }
  .footer__top {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
  }
  .footer__logo {
    font-family: var(--font-title);
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.7rem;
  }
  .footer__logo span { color: var(--accent); }
  .footer__tagline {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 260px;
  }
  .footer__col-title {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.13em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
  }
  .footer__nav { display: flex; flex-direction: column; gap: 0.55rem; }
  .footer__nav a {
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: color var(--t) var(--ease);
  }
  .footer__nav a:hover { color: var(--text-primary); }
  .footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-light);
    gap: var(--space-md);
  }
  .footer__copy  { font-size: 0.82rem; color: var(--text-tertiary); }
  .footer__claim {
    font-size: 0.875rem;
    font-style: italic;
    color: var(--text-secondary);
    text-align: right;
    max-width: 420px;
  }
}


/* =========================================
   @layer responsive
   — Breakpoints + prefers-reduced-motion
========================================= */
@layer responsive {

  /* tablet ≤ 920px */
  @media (max-width: 920px) {
    .hero__grid        { grid-template-columns: 1fr; }
    .hero__stats       { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 100%; margin: 0; }
    .hero__order-first { order: -1; }

    .nosotros__grid    { grid-template-columns: 1fr; }
    .pillars           { grid-template-columns: repeat(2, 1fr); }
    .servicios__layout { grid-template-columns: 1fr; }
    .contacto__layout  { grid-template-columns: 1fr; }
    .footer__top       { grid-template-columns: 1fr 1fr; }
  }

  /* mobile ≤ 600px */
  @media (max-width: 600px) {
    :root {
      --space-xl: 4rem;
      --space-lg: 2.5rem;
    }

    .nav__links  { display: none; }
    .nav__burger { display: flex; }

    .hero__order-first { order: 0; }   /* stats debajo del contenido */
    .hero__stats { grid-template-columns: 1fr 1fr; }

    .pillars  { grid-template-columns: 1fr; }
    .dif-grid { grid-template-columns: 1fr; }
    .form__row { grid-template-columns: 1fr; }

    .footer__top    { grid-template-columns: 1fr; }
    .footer__bottom { flex-direction: column; text-align: center; }
    .footer__claim  { text-align: center; }
  }

  /* ── prefers-reduced-motion ──────────────────
     Usuarios que piden menos movimiento en el SO.
     Cap 4 Vanilla Web: accesibilidad CSS.
     Se desactivan transitions, transforms animados
     y el scroll suavizado del navegador.
  ─────────────────────────────────────────────── */
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    *,
    *::before,
    *::after {
      transition-duration:  0.01ms !important;
      animation-duration:   0.01ms !important;
      animation-iteration-count: 1 !important;
    }
  }
}