/* ============================================================
   BASE — Reset + Foundation
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-primary);
  background-color: var(--page-bg);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: var(--tracking-normal);
  overflow-x: hidden;
}

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

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

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

ul, ol { list-style: none; }
input, textarea, select { font: inherit; }

::selection {
  background: var(--accent-light);
  color: var(--text-primary);
}

/* ── Layout ──────────────────────────────────────── */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

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

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

/* ── Section ─────────────────────────────────────── */

.section {
  padding: var(--sp-section) 0;
}

.section--dark {
  background: var(--surface-dark);
  color: var(--text-inverse);
}

.section__eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--accent);
  margin-bottom: var(--sp-4);
}

.section--dark .section__eyebrow {
  color: var(--accent-light);
}

.section__title {
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin-bottom: var(--sp-4);
  color: #1A1F2B;
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-normal);
  max-width: 560px;
}

.section--dark .section__subtitle {
  color: var(--text-muted);
}

.section__header {
  margin-bottom: var(--sp-16);
}

.section__header--center {
  text-align: center;
}

.section__header--center .section__subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* ── Typography ──────────────────────────────────── */

.t-display {
  font-size: var(--text-hero);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.t-h1 {
  font-size: var(--text-5xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.t-h2 {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.t-h3 {
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
}

.t-h4 {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: var(--leading-snug);
}

.t-body {
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-secondary);
}

.t-body-lg {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  color: var(--text-secondary);
}

.t-caption {
  font-size: var(--text-sm);
  color: var(--text-muted);
  letter-spacing: 0;
}

/* ── Scroll Reveal ───────────────────────────────── */

/* Focus visible — accessible keyboard focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

:focus:not(:focus-visible) {
  outline: none;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

.reveal--delay-1 { transition-delay: 80ms; }
.reveal--delay-2 { transition-delay: 160ms; }
.reveal--delay-3 { transition-delay: 240ms; }
.reveal--delay-4 { transition-delay: 320ms; }
.reveal--delay-5 { transition-delay: 400ms; }
.reveal--delay-6 { transition-delay: 480ms; }

/* ── Reduced Motion ──────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}