/* =========================================================
   Zero Noise Studio
   Concept: noise resolving into signal. The page begins as
   grain/noise and quiets toward silence at the footer.
   Palette: warm bone paper, warm ink, one vermillion signal.
   Type: Fraunces (judgement) / Space Grotesk (clarity) /
         Space Mono (signal readouts).
   ========================================================= */

:root {
  --paper:      #f3efe6;
  --paper-2:    #efe9dd;
  --ink:        #16130f;
  --ink-soft:   #4a453d;
  --muted:      #8b8478;
  --line:       rgba(22, 19, 15, 0.14);
  --line-soft:  rgba(22, 19, 15, 0.08);
  --signal:     #d63a1c;
  --signal-ink: #b32f14;

  --f-display: "Fraunces", Georgia, "Times New Roman", serif;
  --f-body:    "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif;
  --f-mono:    "Space Mono", ui-monospace, "SFMono-Regular", monospace;

  --gutter: clamp(1.25rem, 5vw, 6rem);
  --maxw: 1240px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: clamp(1rem, 0.94rem + 0.3vw, 1.125rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3 { margin: 0; font-weight: 400; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
canvas { display: block; }
img, svg { max-width: 100%; }

::selection { background: var(--signal); color: var(--paper); }

/* ---------- page grain / static ---------- */
.static {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.55; /* driven toward 0 on scroll via JS */
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* ---------- shared layout: the "instrument printout" grid ---------- */
.hero, .ethos, .build, .questions, .contact {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  position: relative;
  z-index: 2;
}

.col-main { min-width: 0; }

.section-title {
  font-family: var(--f-display);
  font-optical-sizing: auto;
  font-size: clamp(1.9rem, 1.2rem + 3vw, 3.4rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  font-weight: 380;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem var(--gutter);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(120%) blur(9px);
  -webkit-backdrop-filter: saturate(120%) blur(9px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.site-header.is-stuck { border-bottom-color: var(--line); }

.brand { display: inline-flex; align-items: center; gap: 0.6rem; }
.brand__mark {
  color: var(--signal);
  width: 46px; height: 16px;
  display: inline-block;
}
.brand__mark svg { width: 100%; height: 100%; overflow: visible; }
.brand__name {
  font-family: var(--f-display);
  font-weight: 460;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  line-height: 1;
}
.brand__sub {
  font-family: var(--f-mono);
  font-weight: 400;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-left: 0.45rem;
  vertical-align: middle;
}

.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2rem); }
.site-nav > a:not(.btn) {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  transition: color 0.2s ease;
}
.site-nav > a:not(.btn):hover { color: var(--ink); }

/* ---------- buttons / links ---------- */
.btn {
  --pad-y: 0.72rem;
  --pad-x: 1.35rem;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: var(--pad-y) var(--pad-x);
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 999px;
  overflow: hidden;
  transition: color 0.25s ease, background 0.25s ease;
}
.btn::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--signal);
  transform: translateY(101%);
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.1, 1);
  z-index: -1;
}
.btn:hover { border-color: var(--signal); }
.btn:hover::before { transform: translateY(0); }
.btn--sm { --pad-y: 0.5rem; --pad-x: 1rem; font-size: 0.72rem; }
.btn--lg { --pad-y: 0.95rem; --pad-x: 2rem; font-size: 0.9rem; }

.link-arrow {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.link-arrow span { display: inline-block; transition: transform 0.25s ease; }
.link-arrow:hover { color: var(--signal-ink); border-color: var(--signal); }
.link-arrow:hover span { transform: translateX(4px); }

/* ---------- hero ---------- */
.hero {
  padding-top: clamp(3.5rem, 9vw, 8rem);
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

.kicker {
  font-family: var(--f-mono);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}
.hero__title {
  font-family: var(--f-display);
  font-optical-sizing: auto;
  font-weight: 340;
  font-size: clamp(2.6rem, 1rem + 7vw, 6.4rem);
  line-height: 0.98;
  letter-spacing: -0.022em;
}
.hero__title em {
  font-style: italic;
  font-weight: 380;
  color: var(--signal);
}

/* oscilloscope */
.scope {
  margin: clamp(2rem, 5vw, 3.5rem) 0 clamp(1.6rem, 3vw, 2.2rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0.4rem 0 0.55rem;
}
.scope canvas {
  width: 100%;
  height: clamp(96px, 15vw, 200px);
}
.scope__cap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.55rem;
}
.scope__state { color: var(--signal-ink); }

.scope__toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px;
  flex-shrink: 0;
}
.scope__btn {
  font: inherit;
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  background: transparent;
  border: 0;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s ease, background 0.25s ease;
}
.scope__btn:hover { color: var(--ink); }
.scope__btn.is-active {
  color: var(--paper);
  background: var(--ink);
}
.scope__btn[data-mode="noise"].is-active { background: var(--signal); }
.scope__btn:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

.hero__sub {
  max-width: 40ch;
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.4rem);
  line-height: 1.5;
  color: var(--ink-soft);
}
.hero__actions {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 3vw, 2.2rem);
  flex-wrap: wrap;
  margin-top: clamp(1.8rem, 3vw, 2.4rem);
}

/* ---------- ethos ---------- */
.ethos {
  padding-block: clamp(4rem, 10vw, 9rem);
}
.ethos__lead {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: clamp(1.2rem, 2vw, 1.8rem);
}
.ethos__title {
  font-family: var(--f-display);
  font-optical-sizing: auto;
  font-weight: 330;
  font-size: clamp(2.4rem, 1rem + 6vw, 5.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  max-width: 16ch;
}
.ethos__title .strike {
  position: relative;
  font-style: italic;
  color: var(--muted);
  white-space: nowrap;
}
.ethos__title .strike::after {
  content: "";
  position: absolute;
  left: -0.06em; right: -0.06em;
  top: 52%;
  height: 0.06em;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.1, 1);
}
.ethos.is-in .strike::after { transform: scaleX(1); }
.ethos__note {
  margin-top: clamp(1.6rem, 3vw, 2.4rem);
  max-width: 46ch;
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.3rem);
  color: var(--ink-soft);
}

/* ---------- what we build ---------- */
.build { padding-block: clamp(3rem, 6vw, 5rem); }
.builds { list-style: none; margin: 0; padding: 0; }

.build-item {
  display: grid;
  grid-template-columns: 3.2rem 5.5rem minmax(0, 1fr);
  gap: clamp(1rem, 2.5vw, 2.4rem);
  align-items: start;
  padding: clamp(1.8rem, 3.5vw, 2.8rem) 0;
  border-top: 1px solid var(--line);
}
.build-item:last-child { border-bottom: 1px solid var(--line); }

.build-item__index {
  font-family: var(--f-mono);
  font-size: 0.82rem;
  color: var(--muted);
  padding-top: 0.5rem;
}
.build-item__glyph {
  height: 3rem;
  padding-top: 0.2rem;
  color: var(--signal);
}
.build-item--rule .build-item__glyph { color: var(--ink); }
.build-item__glyph svg { width: 100%; height: 100%; overflow: visible; }

.build-item__head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}
.build-item__head h3 {
  font-family: var(--f-display);
  font-optical-sizing: auto;
  font-weight: 400;
  font-size: clamp(1.4rem, 1rem + 1.4vw, 2.1rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.tag {
  font-family: var(--f-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
  transform: translateY(-0.15em);
}
.tag--ai { color: var(--signal-ink); border: 1px solid var(--signal); background: color-mix(in srgb, var(--signal) 8%, transparent); }
.tag--rule { color: var(--ink-soft); border: 1px solid var(--line); }

.build-item__hook {
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.25rem);
  color: var(--ink);
  margin-bottom: 0.6rem;
  max-width: 52ch;
}
.build-item__desc {
  color: var(--ink-soft);
  max-width: 60ch;
}

/* ---------- questions ---------- */
.questions { padding-block: clamp(4rem, 8vw, 7rem); }
.qa { margin: 0; }
.qa__item {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(1rem, 3vw, 3rem);
  padding: clamp(1.6rem, 3vw, 2.4rem) 0;
  border-top: 1px solid var(--line);
}
.qa__item:last-child { border-bottom: 1px solid var(--line); }
.qa dt {
  font-family: var(--f-display);
  font-optical-sizing: auto;
  font-weight: 400;
  font-size: clamp(1.25rem, 1rem + 1vw, 1.7rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.qa dd {
  margin: 0;
  color: var(--ink-soft);
  max-width: 52ch;
}

/* ---------- contact ---------- */
.contact { padding-block: clamp(5rem, 10vw, 9rem); }
.contact__title {
  font-family: var(--f-display);
  font-optical-sizing: auto;
  font-weight: 330;
  font-size: clamp(2.6rem, 1rem + 7vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.022em;
}
.contact__title { margin-bottom: clamp(1.2rem, 2vw, 1.6rem); }
.contact__sub {
  max-width: 46ch;
  font-size: clamp(1.05rem, 1rem + 0.4vw, 1.3rem);
  color: var(--ink-soft);
  margin-bottom: clamp(2rem, 4vw, 2.8rem);
}
/* ---------- contact form ---------- */
.cform {
  max-width: 46rem;
  margin-top: clamp(0.5rem, 2vw, 1rem);
}
.cform__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.4rem, 3vw, 2.4rem);
}
.field {
  display: flex;
  flex-direction: column;
  margin-bottom: clamp(1.5rem, 3vw, 2.2rem);
}
.field__label {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin-bottom: 0.7rem;
}
.field__input {
  font-family: var(--f-body);
  font-size: 1.05rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0;
  transition: border-color 0.25s ease;
  border-radius: 0;
  width: 100%;
}
.field__input::placeholder { color: var(--muted); opacity: 0.8; }
.field__input:focus {
  outline: none;
  border-bottom-color: var(--signal);
}
.field__input--area { resize: none; overflow: hidden; min-height: 3.2rem; line-height: 1.55; }
.field--invalid .field__input { border-bottom-color: var(--signal); }
.field__error {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--signal-ink);
  min-height: 1rem;
  margin-top: 0.4rem;
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.field--invalid .field__error { opacity: 1; transform: none; }

.cform__foot {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
  flex-wrap: wrap;
  margin-top: 0.4rem;
}
.cform__status {
  font-family: var(--f-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.cform__status.is-ok { color: var(--signal-ink); }
.cform.is-sent .cform__foot .btn { pointer-events: none; opacity: 0.55; }

@media (max-width: 620px) {
  .cform__row { grid-template-columns: 1fr; gap: 0; }
}

.flatline {
  margin-top: clamp(3rem, 8vw, 6rem);
  height: 1px;
  background: var(--line);
  position: relative;
}
.flatline span {
  position: absolute;
  left: 0; top: 50%;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--signal);
  transform: translate(-50%, -50%);
  animation: drift 9s linear infinite;
}
@keyframes drift {
  from { left: 0; }
  to   { left: 100%; }
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: baseline;
  gap: clamp(1rem, 4vw, 3rem);
  flex-wrap: wrap;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(2rem, 4vw, 3rem) var(--gutter) clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--line);
}
.footer__name { font-size: 1.1rem; }
.footer__domain {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--signal-ink);
}
.footer__meta {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  max-width: 30ch;
}
.footer__copy {
  flex-basis: 100%;
  font-family: var(--f-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-top: clamp(0.75rem, 2vw, 1.25rem);
}

/* ---------- reveal-on-scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.6, 0.2, 1); }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .build-item {
    grid-template-columns: 2.4rem 1fr;
    grid-template-areas:
      "idx head"
      "gly body";
    row-gap: 0.8rem;
  }
  .build-item__index { grid-area: idx; }
  .build-item__glyph { grid-area: gly; height: 2rem; align-self: center; }
  .build-item__body { grid-area: body; grid-column: 1 / -1; }
  .qa__item { grid-template-columns: 1fr; gap: 0.7rem; }
  .site-nav { gap: 0.9rem; }
  .site-nav > a:not(.btn) { display: none; }
}

@media (max-width: 520px) {
  .footer__meta { margin-left: 0; }
}

/* ---------- reduced motion ---------- */
@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; }
  .reveal { opacity: 1; transform: none; }
  .flatline span { display: none; }
}