/* ==========================================================================
   About page — founder story over a scroll-morphing particle field.
   Reached only from the footer "About" link.
   ========================================================================== */

.about-page {
  --ab-bg: #0b120e;
  --ab-bg-2: #13211a;
  --ab-text: var(--paper);
  --ab-text-2: rgba(247, 244, 238, 0.72);
  --ab-text-3: rgba(247, 244, 238, 0.5);
  --ab-line: rgba(247, 244, 238, 0.16);
  color: var(--ab-text);
  background: radial-gradient(120% 90% at 50% 40%, var(--ab-bg-2), var(--ab-bg) 70%);
  background-color: var(--ab-bg);
  background-attachment: fixed;
}

.about-page ::selection {
  background: rgba(184, 201, 181, 0.35);
}

.about-page :focus-visible {
  outline-color: var(--sage, #B8C9B5);
}

/* ---- Particle field ---------------------------------------------------- */

.field,
.field-fallback {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.field {
  z-index: 0;
  display: block;
}

/* Shown if WebGL is unavailable: a soft glowing orb */
.field-fallback {
  z-index: 0;
  display: none;
  background: radial-gradient(closest-side at 55% 45%, rgba(247, 244, 238, 0.55), rgba(184, 201, 181, 0.25) 45%, transparent 75%);
  background-size: min(80vw, 640px) min(80vw, 640px);
  background-repeat: no-repeat;
  background-position: 55% 45%;
}

.no-webgl .field { display: none; }
.no-webgl .field-fallback { display: block; }

/* ---- Header ------------------------------------------------------------ */

.ab-head {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--s-6);
  padding: 22px var(--gutter);
}

.ab-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ab-text);
}

.ab-logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--ab-line);
}

.ab-tag {
  display: none;
  font-size: var(--fs-micro);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ab-text-3);
}

.ab-back {
  margin-left: auto;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  color: var(--ab-text);
  box-shadow: inset 0 0 0 1px var(--ab-line);
  transition: background-color var(--dur-sm) var(--ease-standard);
}

.ab-back:hover {
  background: rgba(247, 244, 238, 0.08);
}

/* ---- Chapter rail ------------------------------------------------------ */

.ab-rail {
  position: fixed;
  right: var(--gutter);
  top: 50%;
  z-index: 10;
  display: grid;
  gap: 14px;
  transform: translateY(-50%);
}

.ab-rail a {
  display: block;
  width: 14px;
  height: 2px;
  margin-left: auto;
  border-radius: 2px;
  background: var(--ab-line);
  transition: width var(--dur-md) var(--ease-emphasized), background-color var(--dur-md) var(--ease-standard);
}

/* bigger hit area without changing the look */
.ab-rail a::before {
  content: "";
  display: block;
  height: 14px;
  margin-top: -6px;
}

.ab-rail a.is-active {
  width: 28px;
  background: var(--ab-text);
}

/* ---- Chapters ---------------------------------------------------------- */

.ab-main {
  position: relative;
  z-index: 1;
}

.ch {
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 120px var(--gutter);
}

.ch-inner {
  width: 100%;
  max-width: 520px;
}

.ch--right {
  justify-content: flex-end;
}

.ch--center {
  justify-content: center;
  text-align: center;
}

.ch--center .ch-inner {
  max-width: 640px;
}

.ch-label {
  margin-bottom: var(--s-5);
  font-size: var(--fs-micro);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--sage, #B8C9B5);
}

.ch-title {
  font-size: clamp(2.6rem, 1.4rem + 4.6vw, 5.4rem);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.035em;
  text-transform: uppercase;
  color: var(--ab-text);
}

.ch-text {
  max-width: 44ch;
  margin-top: var(--s-6);
  font-size: var(--fs-lead);
  line-height: 1.55;
  color: var(--ab-text-2);
}

.ch--center .ch-text {
  margin-inline: auto;
}

.ch-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: var(--s-8);
}

.ch-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--s-8);
  padding: 12px 20px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ab-text);
  box-shadow: inset 0 0 0 1px var(--ab-line);
  transition: background-color var(--dur-sm) var(--ease-standard), transform var(--dur-sm) var(--ease-emphasized);
}

.ch-actions .ch-btn {
  margin-top: 0;
}

.ch-btn:hover {
  background: rgba(247, 244, 238, 0.08);
  transform: translateY(-1px);
}

.ch-btn--solid {
  color: var(--blue);
  background: var(--paper);
  box-shadow: none;
}

.ch-btn--solid:hover {
  background: #fff;
}

.ch-btn-icon {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ch-sign {
  margin-top: var(--s-10);
  font-size: var(--fs-small);
  color: var(--ab-text-3);
}

.ch-sign strong {
  font-weight: 600;
  color: var(--ab-text);
}

.ch-sign a {
  color: var(--ab-text-2);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Text eases in as each chapter arrives (transform + opacity only) */
.js .ch-inner > * {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition: opacity var(--dur-xl) var(--ease-out), transform var(--dur-xl) var(--ease-out);
}

.js .ch.is-in .ch-inner > * {
  opacity: 1;
  transform: none;
}

.js .ch.is-in .ch-inner > :nth-child(2) { transition-delay: 80ms; }
.js .ch.is-in .ch-inner > :nth-child(3) { transition-delay: 160ms; }
.js .ch.is-in .ch-inner > :nth-child(4) { transition-delay: 240ms; }
.js .ch.is-in .ch-inner > :nth-child(5) { transition-delay: 320ms; }

/* ---- Hint -------------------------------------------------------------- */

.ab-hint {
  position: fixed;
  right: var(--gutter);
  bottom: 22px;
  z-index: 10;
  font-size: var(--fs-micro);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ab-text-3);
  transition: opacity var(--dur-lg) var(--ease-standard);
}

.ab-hint.is-hidden {
  opacity: 0;
}

/* ---- Small screens: keep text readable over the particles -------------- */

@media (max-width: 767px) {
  .ch {
    align-items: flex-end;
    padding-bottom: 72px;
  }

  .ch--right {
    justify-content: flex-start;
  }

  .ch-inner {
    padding: 22px 20px;
    border-radius: var(--r-lg);
    background: rgba(11, 18, 14, 0.55);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .ch--center .ch-inner {
    text-align: left;
  }

  .ch--center .ch-actions {
    justify-content: flex-start;
  }

  .ab-rail {
    display: none;
  }

  .ab-hint {
    display: none;
  }
}

@media (min-width: 900px) {
  .ab-tag {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .js .ch-inner > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}