/* ============================================================
   Red Sea Crown — Base: reset, RTL, typography, layout, a11y
   ============================================================ */

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

* {
  margin: 0;
  padding: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-base);
  line-height: var(--lh-body);
  color: var(--teal);
  background-color: var(--page-bg);
  transition: background-color 1.1s var(--ease-expo);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* subtle paper grain over the whole page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: var(--z-top);
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

input,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* ---- Headings ---- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
  color: var(--teal);
}

h2 {
  font-size: var(--text-h2);
  line-height: var(--lh-snug);
}

h3 {
  font-size: var(--text-h3);
  font-weight: 700;
}

p {
  max-width: 70ch;
}

strong {
  font-weight: 700;
}

/* ---- Layout primitives ---- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.15rem, 0.5rem + 3vw, 3rem);
}

.container--narrow {
  max-width: var(--container-narrow);
}

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

.section--tight {
  padding-block: clamp(3rem, 2rem + 4vw, 5.5rem);
}

/* ---- Section heading block ---- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--teal-700);
  margin-block-end: var(--space-sm);
}

.eyebrow::before {
  content: "";
  inline-size: 26px;
  block-size: 2px;
  background: var(--gold-deep);
  border-radius: 2px;
}

.section-title {
  font-size: var(--text-h2);
  max-width: 18ch;
}

.section-intro {
  color: var(--muted);
  font-size: var(--text-lead);
  font-weight: 300;
  margin-block-start: var(--space-sm);
  max-width: 56ch;
}

/* gold hairline divider */
.rule-gold {
  block-size: 1px;
  background: linear-gradient(
    to left,
    transparent,
    var(--gold-deep),
    transparent
  );
  border: 0;
}

/* ---- Accessibility ---- */
.skip-link {
  position: absolute;
  inset-block-start: -100px;
  inset-inline-start: 1rem;
  z-index: var(--z-top);
  background: var(--teal);
  color: var(--white);
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-sm);
  transition: inset-block-start var(--dur-normal) var(--ease-expo);
}

.skip-link:focus {
  inset-block-start: 1rem;
}

:focus-visible {
  outline: 3px solid var(--gold-deep);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* ---- Reveal-on-scroll (generic, IO-driven) ---- */
.reveal {
  opacity: 0;
  transform: translateY(38px);
  transition: opacity 0.8s var(--ease-expo), transform 0.8s var(--ease-expo);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal[data-delay="1"] {
  transition-delay: 0.08s;
}
.reveal[data-delay="2"] {
  transition-delay: 0.16s;
}
.reveal[data-delay="3"] {
  transition-delay: 0.24s;
}
.reveal[data-delay="4"] {
  transition-delay: 0.32s;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}