/* ====================================================================
   Potential Paralysis — styles.css
   Pure black, monochrome, weighted.
   ==================================================================== */

:root {
  --bg: #000000;
  --text: #f5f5f5;
  --text-strong: #ffffff;
  --muted: #888888;
  --muted-soft: #666666;
  --rule: #2a2a2a;

  --font-display: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;

  --measure: 38rem;          /* ~608px reading column */
  --measure-wide: 46rem;
  --section-pad-y: clamp(80px, 12vh, 140px);
}

/* ---- Reset / base ------------------------------------------------ */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
}

@media (max-width: 640px) {
  body { font-size: 18px; }
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 160ms ease, color 160ms ease;
}

a:hover, a:focus-visible { opacity: 0.7; }

a:focus-visible {
  outline: 1px solid var(--text);
  outline-offset: 4px;
  opacity: 1;
}

p { margin: 0 0 1.4em 0; }
p:last-child { margin-bottom: 0; }

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

::selection { background: #ffffff; color: #000000; }

/* ---- Section primitives ----------------------------------------- */

main { display: block; }

section {
  padding: var(--section-pad-y) 24px;
  position: relative;
}

@media (max-width: 640px) {
  section { padding: clamp(64px, 14vh, 96px) 22px; }
}

.section-h {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: clamp(11px, 1.1vw, 12px);
  color: var(--muted);
  margin: 0 auto 2.4em;
  max-width: var(--measure);
  text-align: left;
}

.filter .section-h,
.notfor .section-h {
  text-align: center;
}

/* ---- Hero -------------------------------------------------------- */

.hero {
  min-height: 100svh;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
}

.hero__inner {
  max-width: 920px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__headline {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 7.2vw, 80px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text-strong);
  margin: 0;
  text-wrap: balance;
}

.hero__sub {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 1.8vw, 22px);
  line-height: 1.5;
  color: var(--muted);
  margin: 28px 0 0;
  max-width: 38rem;
  text-wrap: balance;
}

@media (max-width: 540px) {
  .br-md { display: none; }
}

.hero__cue {
  margin-top: clamp(56px, 9vh, 96px);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 4px;
}

.hero__cue:hover { color: var(--text); opacity: 1; }

.hero__chevron {
  animation: cue-bob 2.4s ease-in-out infinite;
}

@keyframes cue-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(3px); }
}

@media (prefers-reduced-motion: reduce) {
  .hero__chevron { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---- Prose (founder story + filter body) ------------------------ */

.prose {
  max-width: var(--measure);
  margin: 0 auto;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.78;
  color: var(--text);
}

.prose p { margin: 0 0 1.4em; }
.prose p:last-child { margin-bottom: 0; }

.prose--center { text-align: center; }
.prose--center p { margin-bottom: 1.1em; }

/* ---- Method ------------------------------------------------------ */

.method {
  /* inherits section padding */
}

.mechanisms {
  max-width: var(--measure);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.6em;
}

.mech { }

.mech__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--text-strong);
  margin: 0 0 0.5em;
}

.mech__desc {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  margin: 0;
}

.mech__more {
  max-width: var(--measure);
  margin: 3.2em auto 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.98rem;
  color: var(--muted);
}

/* ---- Filter / CTA ----------------------------------------------- */

.filter {
  text-align: center;
}

.filter .prose {
  max-width: 36rem;
  margin: 0 auto;
}

.filter .prose .emph {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.12em;
  color: var(--text-strong);
  margin-top: 1.6em;
}

.cta {
  display: inline-block;
  margin-top: 3em;
  padding: 16px 38px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-strong);
  border: 1px solid var(--text);
  background: transparent;
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease, transform 200ms ease;
}

.cta:hover,
.cta:focus-visible {
  background: var(--text-strong);
  color: var(--bg);
  opacity: 1;
  transform: translateY(-1px);
}

/* ---- What this is not ------------------------------------------- */

.notfor {
  text-align: center;
}

.notfor__list {
  max-width: 38rem;
  margin: 0 auto;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.78;
  color: var(--text);
}

.notfor__list li {
  padding: 0.5em 0;
}

.notfor__close {
  max-width: 38rem;
  margin: 2.2em auto 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.12rem;
  color: var(--text-strong);
  text-wrap: balance;
}

/* ---- Footer ------------------------------------------------------ */

.footer {
  padding: 80px 24px 56px;
  border-top: 1px solid var(--rule);
  text-align: center;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
  align-items: center;
  margin: 0 0 2em;
}

.footer__label {
  display: inline-block;
  min-width: 90px;
  text-align: right;
  margin-right: 14px;
  color: var(--muted-soft);
  letter-spacing: 0.04em;
  font-size: 12px;
  text-transform: uppercase;
}

.footer__list a {
  color: var(--text);
}

.footer__sig {
  margin: 0 0 6px;
  color: var(--text);
}

.footer__copy {
  margin: 0;
  color: var(--muted-soft);
  font-size: 12px;
  letter-spacing: 0.04em;
}

@media (max-width: 540px) {
  .footer__list { gap: 0.9em; }
  .footer__list li {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .footer__label {
    min-width: 0;
    text-align: center;
    margin-right: 0;
  }
}

/* ---- Hero entrance (minimal, page-load only) -------------------- */

@media (prefers-reduced-motion: no-preference) {
  .hero__headline,
  .hero__sub,
  .hero__cue {
    opacity: 0;
    animation: hero-in 900ms ease forwards;
  }
  .hero__headline { animation-delay: 80ms; }
  .hero__sub      { animation-delay: 360ms; }
  .hero__cue      { animation-delay: 700ms; }
}

@keyframes hero-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}