/* Pure Signal — shared design system for scrolling sub-pages
   (Advisory, Technology, Signal, Privacy). The home Stage keeps its
   own inline CSS; these tokens mirror it so the whole site reads as one. */

/* Inter, self-hosted (variable font, weights 400–700). No third-party requests. */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("/assets/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("/assets/fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
  --ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --hairline: rgba(0, 0, 0, 0.28);
  --rule: rgba(0, 0, 0, 0.12);
  --muted: rgba(0, 0, 0, 0.62);
  --display-font: "Inter", "Neue Haas Grotesk", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --body-font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sig-red: #c6371f;
  --sig-amber: #d08700;
  --sig-green: #0e8a3e;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --measure: min(64rem, 100%);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: #fff;
  color: #000;
  font-family: var(--body-font);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  overflow-x: hidden;
}

/* no orphan words */
h1, h2, h3, .display, .kicker { text-wrap: balance; }
p, li, .lede { text-wrap: pretty; }

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

/* ---------- brand mark (CSS mask, same artwork as the Stage) ---------- */
.brand__mark {
  display: block;
  width: 100%;
  aspect-ratio: 1024 / 330;
  background-color: #000;
  -webkit-mask: url("/blackletterbrand.png") center / contain no-repeat;
  mask: url("/blackletterbrand.png") center / contain no-repeat;
}
@supports not ((-webkit-mask: url("")) or (mask: url(""))) {
  .brand__mark { background: url("/blackletterbrand.png") center / contain no-repeat; }
}

/* ---------- top navigation ---------- */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: clamp(1rem, 2.4vw, 1.6rem) var(--gutter);
  background: linear-gradient(#fff 60%, rgba(255, 255, 255, 0));
}
.site-nav__brand { display: block; width: clamp(6.5rem, 12vw, 9rem); }
.site-nav__links {
  display: flex;
  gap: clamp(1rem, 2.6vw, 2.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__links a {
  color: #000;
  text-decoration: none;
  font-size: clamp(0.7rem, 0.4vw + 0.6rem, 0.82rem);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.55;
  transition: opacity 260ms ease;
}
.site-nav__links a:hover,
.site-nav__links a:focus-visible,
.site-nav__links a[aria-current="page"] { opacity: 1; }
.site-nav__toggle {
  display: none;
  position: relative;
  z-index: 30;
  width: 2.5rem;
  height: 2.5rem;
  margin-right: -0.5rem;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  flex-shrink: 0;
}
.site-nav__toggle span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1.375rem;
  height: 1.5px;
  background: #000;
  transform: translate(-50%, calc(-50% - 4px));
  transition: transform 260ms ease;
}
.site-nav__toggle span + span { transform: translate(-50%, calc(-50% + 4px)); }
.site-nav.is-open .site-nav__toggle span { transform: translate(-50%, -50%) rotate(45deg); }
.site-nav.is-open .site-nav__toggle span + span { transform: translate(-50%, -50%) rotate(-45deg); }
body.nav-locked { overflow: hidden; }

/* ---------- page shell ---------- */
.page {
  width: var(--measure);
  margin: 0 auto;
  padding: clamp(7rem, 16vh, 10rem) var(--gutter) clamp(4rem, 12vh, 7rem);
}

/* ---------- type ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  font-size: clamp(0.68rem, 0.4vw + 0.55rem, 0.8rem);
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 clamp(1.4rem, 4vh, 2.4rem);
}
.kicker::before {
  content: "";
  width: clamp(1.6rem, 4vw, 3rem);
  height: 1px;
  background: var(--hairline);
}
.display {
  font-family: var(--display-font);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.015em;
  line-height: 1.02;
  font-size: clamp(2.2rem, 5.4vw, 4.5rem);
  margin: 0 0 clamp(1.25rem, 3vh, 2rem);
}
.lede {
  font-size: clamp(1.05rem, 0.7vw + 0.85rem, 1.5rem);
  line-height: 1.55;
  max-width: 42rem;
  margin: 0 0 clamp(1.5rem, 4vh, 2.5rem);
}
h2 {
  font-family: var(--display-font);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  margin: clamp(2.5rem, 7vh, 4rem) 0 1rem;
}
h3 { font-size: clamp(1.1rem, 1.4vw, 1.35rem); margin: 0 0 0.5rem; }
p { margin: 0 0 1.1rem; }
a { color: inherit; }

/* ---------- underline link ---------- */
.line-link {
  color: #000;
  font-weight: 600;
  text-decoration: none;
  position: relative;
  padding-bottom: 0.12em;
  white-space: nowrap;
}
.line-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: #000;
  transform: scaleX(1);
  transform-origin: left;
  transition: transform 500ms var(--ease-out);
}
.line-link:hover::after,
.line-link:focus-visible::after { transform: scaleX(0.2); }

/* ---------- status pill (Technology) ---------- */
.status-pill {
  display: inline-block;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 0.25em 0.7em;
  vertical-align: middle;
}

/* ---------- author card + contact CTA (advisory, about, every article) ---------- */
.bio {
  display: flex;
  align-items: center;
  gap: clamp(1.5rem, 3.5vw, 2.75rem);
  margin-top: clamp(1.5rem, 4vh, 2.5rem);
  flex-wrap: wrap;
}
.bio__photo {
  flex: 0 0 auto;
  width: clamp(7rem, 11vw, 9.5rem);
  height: clamp(7rem, 11vw, 9.5rem);
  border-radius: 50%;
  overflow: hidden;
  margin: 0;
}
.bio__photo img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(100%) contrast(1.04); }
.bio__text { flex: 1 1 22rem; margin: 0; color: var(--muted); }
.bio__name {
  font-family: var(--display-font);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  color: #000;
  margin: 0 0 0.5rem;
}
.bio__links { margin: 0.9rem 0 0; }
.bio__links a + a { margin-left: 1.5rem; }
.contact-line {
  font-family: var(--display-font);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: clamp(1.3rem, 3vw, 2.4rem);
  margin-top: clamp(1.25rem, 3vh, 2rem);
}

/* Article-foot variants: quieter than the advisory page, each separated
   from the body by a rule. */
.post-foot {
  border-top: 1px solid var(--hairline);
  margin-top: clamp(2.5rem, 6vh, 3.5rem);
  padding-top: clamp(1.75rem, 4.5vh, 2.5rem);
}
.post-foot .bio { margin-top: 0; }
.post-foot .bio__photo { width: clamp(5rem, 7vw, 6.5rem); height: clamp(5rem, 7vw, 6.5rem); }
.post-foot .contact-line { font-size: clamp(1.1rem, 2.2vw, 1.6rem); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: clamp(2rem, 5vh, 3rem) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 1.8rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: center;
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: #000; }

/* ---------- subtle reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 800ms var(--ease-out);
}
.reveal.is-in { opacity: 1; transform: translateY(0); }

@media (max-width: 560px) {
  /* Five links no longer fit beside the logo on phones, so the row collapses
     into a hamburger. The links become a full-screen overlay; brand and
     toggle sit above it so the mark stays visible and the button can close. */
  .site-nav { gap: 0.75rem; padding-left: 1rem; padding-right: 1rem; }
  .site-nav__brand { width: 4.5rem; flex-shrink: 0; position: relative; z-index: 30; }
  .site-nav__toggle { display: block; }
  .site-nav__links {
    position: fixed;
    inset: 0;
    z-index: 25;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.25rem;
    /* Biased above centre so the last link clears the cookie banner
       (z-index 9999) when it's showing on a first visit. */
    padding-bottom: 22svh;
    background: #fff;
    opacity: 0;
    pointer-events: none;
    transition: opacity 260ms ease;
  }
  .site-nav.is-open .site-nav__links { opacity: 1; pointer-events: auto; }
  .site-nav__links a { font-size: 0.9rem; letter-spacing: 0.24em; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .line-link::after { transition: none; }
  .site-nav__toggle span, .site-nav__links { transition: none; }
}