/* ============================================================
   FORGE — base.css
   Reset, texture, type scale (§03, §22), masks, focus
   ============================================================ */

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

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

body {
  background: var(--forge-black);
  color: var(--forge-bone);
  font-family: var(--font-body);
  font-size: clamp(1rem, .4vw + .9rem, 1.125rem);
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  min-height: 100vh;
}

/* film grain — §28, extremely subtle, no VHS filter */
body::after {
  content: "";
  position: fixed;
  inset: -50%;
  z-index: 60;
  pointer-events: none;
  opacity: var(--grain-opacity);
  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='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");
}

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

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--forge-ember); color: var(--forge-black); }

:focus-visible {
  outline: 2px solid var(--forge-ember);
  outline-offset: 3px;
}

/* ---------- type voices (three voices, §03) ---------------- */

.display {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: clamp(4.25rem, 12vw, 13rem);   /* §22 */
  line-height: .82;
  letter-spacing: -.055em;
}

.h2 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: clamp(3rem, 7vw, 7.5rem);      /* §22 */
  line-height: .88;
  letter-spacing: -.035em;
}

.h3 {
  font-family: var(--font-display);
  font-weight: 600;
  text-transform: uppercase;
  font-size: clamp(1.75rem, 3vw, 3rem);
  line-height: .95;
  letter-spacing: -.02em;
}

.body-lg {
  font-size: clamp(1.125rem, 1.5vw, 1.5rem);
  line-height: 1.4;
}

.mono {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: clamp(.6875rem, .3vw + .625rem, .8125rem);
  line-height: 1.5;
  letter-spacing: .08em;                    /* ALL CAPS floor: §typography */
  text-transform: uppercase;
  color: var(--forge-muted);
  font-variant-ligatures: none;
}

.mono--bone { color: var(--forge-bone); }
.mono--ember { color: var(--forge-ember); }

/* ---------- masked reveal system (§19) --------------------- */

.mask {
  display: block;
  overflow: hidden;
}

.mask > * { display: block; }

.word-mask {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
  padding-bottom: .1em;
  margin-bottom: -.1em;
}

html.anim .mask > *,
html.anim .word-mask > * {
  transform: translateY(112%);
  will-change: transform;
}

html.anim [data-reveal] {
  opacity: 0;
  transform: translateY(42px);
  will-change: transform, opacity;
}

/* ---------- shared bits ------------------------------------ */

.section-tag {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.section-tag::before {
  content: "";
  width: 2.5rem;
  height: 1px;
  background: var(--forge-line-lit);
}

.rule {
  border: 0;
  border-top: 1px solid var(--forge-line);
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  background: var(--forge-ember);
  border-radius: 1px;
  display: inline-block;
}

/* honest labelled placeholder for values the client must confirm */
.ph {
  color: var(--forge-muted);
  border-bottom: 1px dashed var(--forge-line-lit);
  padding-bottom: 1px;
}

/* ---------- links & buttons (§27) -------------------------- */

.btn {
  --btn-bg: transparent;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .8em;
  min-height: 48px;
  padding: .85em 1.6em;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: .8125rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  background: var(--btn-bg);
  border: 1px solid var(--forge-line-lit);
  border-radius: var(--radius-sm);
  overflow: hidden;
  isolation: isolate;
  transition: border-color var(--motion-fast) var(--ease-out),
              color var(--motion-fast) var(--ease-out);
}

.btn > * { position: relative; z-index: 1; }

.btn__arrow {
  transition: transform var(--motion-fast) var(--ease-out);
}

/* horizontal fill → label shifts 3px → arrow diagonal (§27) */
.btn--primary {
  background: var(--forge-ember);
  border-color: var(--forge-ember);
  color: var(--forge-black);
}

.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--forge-white);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--motion-base) var(--ease-mechanical);
}

.btn--primary:hover::before,
.btn--primary:focus-visible::before { transform: scaleX(1); }

.btn--primary:hover .btn__label { transform: translateX(3px); }
.btn--primary:hover .btn__arrow { transform: translate(3px, -3px); }
.btn__label { display: inline-block; transition: transform var(--motion-fast) var(--ease-out); }

.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--forge-bone); }

.btn--ghost:hover .btn__arrow { transform: translate(3px, -3px); }

/* secondary: animated underline (§27) */
.link-under {
  display: inline-flex;
  align-items: center;
  gap: .7em;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: .8125rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding-bottom: .5em;
  position: relative;
  min-height: 44px;
}

.link-under::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--forge-line-lit);
  transform-origin: left;
  transition: transform var(--motion-base) var(--ease-out),
              background-color var(--motion-base) var(--ease-out);
}

.link-under:hover::after,
.link-under:focus-visible::after {
  transform: scaleX(1);
  background: var(--forge-bone);
}

.link-under:hover .btn__arrow { transform: translate(3px, -3px); }

/* ---------- reduced motion (§21) --------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  html.anim .mask > *,
  html.anim .word-mask > *,
  html.anim [data-reveal] {
    transform: none !important;
    opacity: 1 !important;
  }
}