/* ==================================================================
   Machala GPS — Base
   Reset moderno, tipografía global, accesibilidad y utilidades.
   ================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
}

html {
    -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

body {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background-color: var(--c-bg);
    color: var(--c-text);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.site-main {
    flex: 1;
}

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

h1,
h2,
h3,
h4 {
    color: var(--c-navy);
    font-weight: 800;
    line-height: 1.15;
    text-wrap: balance;
}

p {
    max-width: 70ch;
    text-wrap: pretty;
}

ul,
ol {
    padding: 0;
}

button {
    font: inherit;
}

::selection {
    background-color: var(--c-blue-600);
    color: #fff;
}

/* ---------- Foco visible (navegación por teclado) ---------- */

:focus-visible {
    outline: 3px solid var(--c-blue-500);
    outline-offset: 3px;
    border-radius: 4px;
}

/* ---------- Layout ---------- */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-pad);
}

/* Espacio en blanco de las páginas sin contenido (Etapas 2+) */
.page-blank {
    min-height: 55vh;
}

/* ---------- Tipografía de sección (compartida entre páginas) ---------- */

.section-title {
    font-size: clamp(1.9rem, 3.6vw, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.12;
}

.section-intro {
    margin-top: 1rem;
    font-size: 1.0625rem;
    max-width: 56ch;
}

/* ---------- Revelado al hacer scroll (progresivo: requiere JS) ---------- */

html.js [data-reveal] {
    opacity: 0;
    transform: translateY(20px);
    transition:
        opacity 640ms var(--ease-out),
        transform 640ms var(--ease-out);
    transition-delay: calc(var(--reveal-i, 0) * 70ms);
}

html.js [data-reveal].is-in {
    opacity: 1;
    transform: none;
}

/* ---------- Accesibilidad: skip link ---------- */

.skip-link {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    z-index: calc(var(--z-drawer) + 10);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-pill);
    background-color: var(--c-navy);
    color: #fff;
    font-weight: 700;
    text-decoration: none;
    transform: translateY(-200%);
}

.skip-link:focus-visible {
    transform: translateY(0);
}

/* ---------- Utilidades ---------- */

/* [hidden] debe ganar siempre, incluso sobre display propios (flex/grid) */
[hidden] {
    display: none !important;
}

.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* Centinelas invisibles para IntersectionObserver (sin listeners de scroll) */
.sentinel {
    position: absolute;
    left: 0;
    width: 1px;
    pointer-events: none;
}

.sentinel--header {
    top: 0;
    height: 24px;
}

.sentinel--scroll {
    top: 0;
    height: 560px;
}

/* ---------- Movimiento reducido ---------- */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-delay: 0s !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        transition-delay: 0s !important;
        scroll-behavior: auto !important;
    }
}