/* ==========================================================================
   Alpa Clean — main.css
   Sistema base: variables, reset, tipografía, layout, utilidades
   ========================================================================== */

:root {
  /* Color de marca — extraído del logo oficial de Alpa Clean */
  --color-primary: #0093D6;
  --color-primary-dark: #0072AC;
  --color-primary-deep: #023E68;
  --color-accent: #35B7DE;

  /* Neutros */
  --color-ink: #0B1420;
  --color-ink-soft: #3A4652;
  --color-bg: #F6F9FB;
  --color-bg-alt: #EEF3F6;
  --color-surface: #FFFFFF;
  --color-line: #DCE4E9;
  --color-tint: #EAF4FB;
  --color-tint-strong: #DCEBF6;

  /* Estados */
  --color-success: #2E9E6B;
  --color-error: #D24545;

  /* Tipografía */
  --font-display: "Segoe UI Semibold", "Helvetica Neue", Arial, "Segoe UI", sans-serif;
  --font-body: "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  /* Escala tipográfica fluida */
  --fs-hero: clamp(2.4rem, 5vw + 1rem, 5rem);
  --fs-h1: clamp(2rem, 3vw + 1rem, 3.4rem);
  --fs-h2: clamp(1.6rem, 2vw + 1rem, 2.5rem);
  --fs-h3: clamp(1.2rem, 1vw + 1rem, 1.6rem);
  --fs-body: clamp(1rem, 0.3vw + 0.9rem, 1.125rem);
  --fs-small: 0.875rem;
  --fs-micro: 0.75rem;

  /* Espaciado */
  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-sm: 1.25rem;
  --space-md: 2rem;
  --space-lg: 2.75rem;
  --space-xl: 4rem;
  --space-2xl: 5.5rem;

  /* Layout */
  --container-max: 1360px;
  --container-pad: clamp(1.25rem, 4vw, 4rem);
  --radius-sm: 8px;
  --radius-md: 13px;
  --radius-lg: 20px;

  /* Movimiento */
  --ease-premium: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 220ms;
  --dur-med: 480ms;
  --dur-slow: 900ms;

  --header-h: 84px;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

img, picture, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol { list-style: none; }

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { max-width: 62ch; }

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: -60px;
  left: var(--space-sm);
  z-index: 999;
  background: var(--color-ink);
  color: #fff;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  transition: top var(--dur-fast) var(--ease-premium);
}
.skip-link:focus {
  top: var(--space-sm);
}

/* ---------- Focus visible ---------- */
:focus-visible {
  outline: 2px solid var(--color-primary-dark);
  outline-offset: 3px;
  border-radius: 4px;
}

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

section {
  position: relative;
}

.section-pad {
  padding-block: var(--space-2xl);
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-primary);
  display: inline-block;
}

.text-muted { color: var(--color-ink-soft); }

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

/* ---------- Reveal on scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-premium),
              transform var(--dur-slow) var(--ease-premium);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-delay="1"] { transition-delay: 90ms; }
[data-reveal-delay="2"] { transition-delay: 180ms; }
[data-reveal-delay="3"] { transition-delay: 270ms; }
[data-reveal-delay="4"] { transition-delay: 360ms; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- Selection ---------- */
::selection {
  background: var(--color-primary);
  color: #fff;
}