/* =========================================================================
   SAINTOX — Base reset, typography, layout primitives
   ========================================================================= */

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

html {
  color-scheme: dark;
  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 {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Subtle depth: a faint radial field + hairline grid, fixed to the viewport.
   No parallax, no motion — just texture so panels do not float on flat black. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60rem 40rem at 82% -10%, rgba(69, 200, 240, 0.08), transparent 60%),
    radial-gradient(50rem 34rem at -10% 20%, rgba(69, 200, 240, 0.05), transparent 60%);
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, black, rgba(0, 0, 0, 0.25) 60%, transparent 100%);
  pointer-events: none;
}

h1, h2, h3, h4, p, figure { margin: 0; }

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

p { color: var(--color-text-secondary); }

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

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

button { font-family: inherit; }

ul { margin: 0; padding: 0; list-style: none; }

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.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;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -3rem;
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  z-index: 100;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

/* ---- layout primitives -------------------------------------------------- */

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--space-9);
  border-top: 1px solid var(--color-border);
  position: relative;
  scroll-margin-top: 76px; /* clears the sticky header when a nav link jumps here */
}

.section--tight { padding-block: var(--space-8); }

.section-head {
  max-width: 46rem;
  margin-bottom: var(--space-7);
}

.section-head--flush { margin-bottom: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px 1px rgba(69, 200, 240, 0.7);
}

.section-title {
  font-size: var(--text-xl);
  max-width: 34rem;
}

.section-lead {
  margin-top: var(--space-4);
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 40rem;
  line-height: var(--leading-snug);
}

@media (min-width: 860px) {
  .section-title { font-size: 2.25rem; }
}

/* ---- reveal-on-scroll (JS toggles .is-visible) ---------------------------
   Scoped to html.js so a no-JS visitor (or a script that fails to load)
   always sees full content — the animation is a progressive enhancement,
   never a requirement for readability. */
html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
html.js .reveal.is-visible { opacity: 1; transform: none; }

/* Staggered reveal for grouped cards — no inline styles needed. */
.reveal-group > *:nth-child(1) { transition-delay: 0ms; }
.reveal-group > *:nth-child(2) { transition-delay: 70ms; }
.reveal-group > *:nth-child(3) { transition-delay: 140ms; }
.reveal-group > *:nth-child(4) { transition-delay: 210ms; }

/* ---- buttons -------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--color-accent);
  color: #04141b;
  box-shadow: 0 0 0 1px rgba(69, 200, 240, 0.5), 0 16px 32px -16px rgba(69, 200, 240, 0.55);
}
.btn--primary:hover {
  background: var(--color-accent-strong);
  box-shadow: 0 0 0 1px rgba(122, 217, 247, 0.6), 0 18px 36px -14px rgba(69, 200, 240, 0.65);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}
.btn--ghost:hover {
  border-color: var(--color-accent-border);
  background: var(--color-accent-dim);
}

.btn--sm { padding: 0.6rem 1.1rem; font-size: var(--text-xs); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

/* ---- cards ------------------------------------------------------------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur-med) var(--ease-out),
              transform var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out);
}

.card--interactive:hover {
  border-color: var(--color-accent-border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card), var(--glow-accent);
}

.card--pad { padding: var(--space-6); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-secondary);
}

.badge--accent { color: var(--color-accent); border-color: var(--color-accent-border); background: var(--color-accent-dim); }
.badge--success { color: var(--color-success); border-color: rgba(62, 207, 142, 0.35); background: var(--color-success-dim); }
.badge--warning { color: var(--color-warning); border-color: rgba(232, 172, 76, 0.35); background: var(--color-warning-dim); }
.badge--danger { color: var(--color-danger); border-color: rgba(239, 111, 111, 0.35); background: var(--color-danger-dim); }

.kicker-note {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  letter-spacing: var(--tracking-wide);
}

/* ---- grids --------------------------------------------------------------- */

.grid {
  display: grid;
  gap: var(--space-5);
}

.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 980px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .grid--4, .grid--2 { grid-template-columns: 1fr; }
}