/* ==========================================================================
   base.css — Element-level styling, layout primitives, typography, motion
   ========================================================================== */

html,
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-weight: var(--fw-regular);
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: -0.011em;
}

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

/* Section ----------------------------------------------------------------- */
section {
  padding-block: var(--space-5);
  scroll-margin-top: calc(var(--header-h) + var(--space-2));
}

@media (min-width: 1024px) {
  section {
    padding-block: var(--space-6);
  }
}

section[id] {
  scroll-margin-top: calc(var(--header-h) + var(--space-3));
}

/* Typographic scale ------------------------------------------------------- */
.eyebrow {
  display: inline-block;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: var(--fw-semi);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.h1,
h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: var(--fw-bold);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.h2,
h2 {
  font-size: clamp(32px, 4.2vw, 52px);
  font-weight: var(--fw-bold);
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.h3,
h3 {
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: var(--fw-semi);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.h4,
h4 {
  font-size: 19px;
  font-weight: var(--fw-semi);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.lead {
  font-size: clamp(18px, 1.6vw, 22px);
  color: var(--color-text-mute);
  line-height: 1.5;
  letter-spacing: -0.01em;
}

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

/* Section header utility -------------------------------------------------- */
.section-head {
  max-width: 760px;
  margin-inline: auto;
  text-align: center;
  margin-bottom: var(--space-6);
}

.section-head .lead {
  margin-top: var(--space-3);
}

/* Skip link --------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-2);
  z-index: 9999;
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: var(--fw-medium);
  transition: top 0.2s var(--ease-apple);
}

.skip-link:focus-visible {
  top: var(--space-2);
}

/* Reveal animation -------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.8s var(--ease-out-quart),
    transform 0.8s var(--ease-out-quart);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal][data-reveal-delay="1"] {
  transition-delay: 0.1s;
}

[data-reveal][data-reveal-delay="2"] {
  transition-delay: 0.2s;
}

[data-reveal][data-reveal-delay="3"] {
  transition-delay: 0.3s;
}

[data-reveal][data-reveal-delay="4"] {
  transition-delay: 0.4s;
}

/* Reduced motion ---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

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