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

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

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: 400;
    line-height: var(--leading-normal);
    color: var(--neutral-800);
    background-color: var(--neutral-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ===== TIPOGRAFIA ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 600;
    line-height: var(--leading-tight);
    color: var(--neutral-900);
    letter-spacing: var(--tracking-tight);
}

/* Headings use fluid tokens (clamp) so they scale smoothly from 320px to 1280px.
   No need for @media overrides; the clamp() handles the full range. */
h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }

p {
    margin-bottom: var(--space-2);
    max-width: 70ch;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-base);
}
a:hover { color: var(--primary-700); }

strong { font-weight: 600; }
em { font-style: italic; }

ul, ol { padding-left: var(--space-3); }
li { margin-bottom: var(--space-1); }

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== LAYOUT ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-inline: var(--space-3);
}

.container--narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding-inline: var(--space-3);
}

.container--wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding-inline: var(--space-3);
}

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

.section--lg {
    padding-block: var(--space-section-lg);
}

/* ===== GRID RESPONSIVE ===== */
.grid {
    display: grid;
    gap: var(--space-4);
}

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

@media (min-width: 640px) {
    .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); }
}

/* ===== FLEX UTILITIES ===== */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* ===== TEXT UTILITIES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--neutral-500); }
.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-uppercase {
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    font-size: var(--text-sm);
    font-weight: 600;
}

/* ===== SPACING UTILITIES ===== */
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mx-auto { margin-inline: auto; }

/* ===== ANIMACIONES ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-on-scroll.slide-left {
    transform: translateX(-30px);
}
.animate-on-scroll.slide-left.is-visible {
    transform: translateX(0);
}

.animate-on-scroll.slide-right {
    transform: translateX(30px);
}
.animate-on-scroll.slide-right.is-visible {
    transform: translateX(0);
}

/* Staggered children animation */
.stagger-children .animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.stagger-children .animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.stagger-children .animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.stagger-children .animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.stagger-children .animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.stagger-children .animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

/* ===== ACCESIBILIDAD ===== */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-2);
    padding: var(--space-1) var(--space-2);
    background: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--transition-base);
}
.skip-link:focus {
    top: var(--space-2);
}

.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;
}

/* Focus visible for keyboard nav */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===== SELECTION ===== */
::selection {
    background: var(--primary-100);
    color: var(--primary-900);
}

/* ===== REDUCED MOTION =====
   Critical for therapy/anxiety pacientes: many users with vestibular disorders
   or anxiety triggers experience nausea/discomfort from animations.
   When prefers-reduced-motion is set, neutralise all motion to ~instant. */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    /* Scroll-triggered fade/slide reveals: show content immediately. */
    .animate-on-scroll,
    .animate-on-scroll.slide-left,
    .animate-on-scroll.slide-right {
        opacity: 1 !important;
        transform: none !important;
    }
}