/* ═══════════════════════════════════════════════════════════════
   BASE — reset, drafting-paper backdrop, typography, layout,
   keyframes, scroll reveal. Tokens only, no color literals.
═══════════════════════════════════════════════════════════════ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--space-md));
  -webkit-text-size-adjust: 100%;
}

/* Column layout so short pages (confirmation) keep the footer at the bottom */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bp-950);
  /* Drafting grid: major lines every 5 cells, minor every cell */
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size:
    calc(var(--grid-size) * 5) calc(var(--grid-size) * 5),
    calc(var(--grid-size) * 5) calc(var(--grid-size) * 5),
    var(--grid-size) var(--grid-size),
    var(--grid-size) var(--grid-size);
  background-position: -1px -1px;
  color: var(--text-soft);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Soft vignette so the grid fades toward the edges */
.paper-vignette {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 30%, transparent 40%, var(--bp-950) 100%);
}

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

img {
  height: auto;
}

a {
  color: var(--ink-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

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

:focus-visible {
  outline: 2px dashed var(--hazard);
  outline-offset: 3px;
}

/* ── Typography ────────────────────────────────────────────── */
h1,
h2,
h3 {
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 2.9rem);
}

h3 {
  font-size: 1.35rem;
  letter-spacing: 0.03em;
}

p + p {
  margin-top: var(--space-md);
}

strong {
  color: var(--text);
  font-weight: 600;
}

code {
  padding: 0.1em 0.35em;
  background: var(--ink-cyan-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

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

/* ── Skip link ─────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  z-index: 100;
  padding: var(--space-xs) var(--space-md);
  background: var(--hazard);
  color: var(--hazard-dark);
  font-weight: 600;
}

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

/* ── Layout ────────────────────────────────────────────────── */
main {
  flex: 1 0 auto;
}

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

.section {
  position: relative;
  padding: var(--space-3xl) 0;
}

.section--tight {
  padding: var(--space-2xl) 0;
}

.section--band {
  background: linear-gradient(180deg, transparent, var(--bp-900) 12%, var(--bp-900) 88%, transparent);
}

.section-head {
  max-width: var(--container-narrow);
  margin: 0 auto var(--space-2xl);
  text-align: center;
}

.section-head h2 {
  margin: var(--space-sm) 0 var(--space-md);
}

.lead {
  color: var(--text-soft);
  font-size: 1.15rem;
}

/* ── Keyframes ─────────────────────────────────────────────── */
@keyframes dash-flow {
  to {
    stroke-dashoffset: -32;
  }
}

/* SKILL.md parts riding the conveyor (SVG user units) */
@keyframes ride {
  0% {
    transform: translate(30px, 166px);
    opacity: 0;
  }
  8%,
  90% {
    opacity: 1;
  }
  100% {
    transform: translate(420px, 166px);
    opacity: 0;
  }
}

@keyframes trace-pulse {
  to {
    stroke-dashoffset: -414;
  }
}

@keyframes fill-bar {
  from {
    transform: scaleX(0);
  }
}

@keyframes blink {
  50% {
    opacity: 0.25;
  }
}

@keyframes needle {
  0%,
  20% {
    transform: rotate(-60deg);
  }
  55%,
  100% {
    transform: rotate(52deg);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ── Scroll reveal ─────────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition:
      opacity 0.7s ease,
      transform 0.7s ease;
  }

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