:root {
  --bitigci-ink: #111827;
  --bitigci-muted: #4b5563;
  --bitigci-line: #d1d5db;
  --bitigci-paper: #ffffff;
  --bitigci-soft: #f3f4f6;
  --bitigci-red: #b91c1c;
  --bitigci-teal: #0f766e;
  --bitigci-gold: #ca8a04;
}

.bitigci-about,
.bitigci-about * {
  box-sizing: border-box;
  letter-spacing: 0;
}

.bitigci-about {
  color: var(--bitigci-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

.bitigci-about__inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.bitigci-about__hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--bitigci-line);
  background: var(--bitigci-paper);
}

.bitigci-about__hero::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 8px;
  background: var(--bitigci-red);
  content: "";
}

.bitigci-about__hero-inner {
  min-height: 390px;
  padding: 64px 0 58px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 56px;
  align-items: center;
}

.bitigci-about__eyebrow,
.bitigci-about__section-label {
  margin: 0 0 10px;
  color: var(--bitigci-red);
  font-size: 14px;
  font-weight: 850;
  line-height: 1.35;
  text-transform: uppercase;
}

.bitigci-about__hero h1 {
  max-width: 820px;
  margin: 0;
  color: var(--bitigci-ink);
  font-size: clamp(40px, 7vw, 78px);
  font-weight: 900;
  line-height: 1.02;
}

.bitigci-about__lead {
  max-width: 800px;
  margin: 24px 0 0;
  color: #374151;
  font-size: 21px;
  font-weight: 520;
  line-height: 1.68;
}

.bitigci-about__hero-mark {
  width: 100%;
  max-width: 240px;
  height: auto;
  justify-self: end;
}

.bitigci-about__band {
  padding: 58px 0;
  border-bottom: 1px solid var(--bitigci-line);
  background: var(--bitigci-paper);
}

.bitigci-about__band--soft {
  background: var(--bitigci-soft);
}

.bitigci-about__band--dark {
  background: var(--bitigci-ink);
  color: #f9fafb;
}

.bitigci-about__section-head {
  max-width: 850px;
  margin-bottom: 30px;
}

.bitigci-about__section-head h2 {
  margin: 0;
  font-size: 33px;
  font-weight: 850;
  line-height: 1.18;
}

.bitigci-about__section-head p,
.bitigci-about__prose p {
  margin: 14px 0 0;
  color: var(--bitigci-muted);
  font-size: 18px;
  line-height: 1.72;
}

.bitigci-about__band--dark .bitigci-about__section-head p,
.bitigci-about__band--dark .bitigci-about__prose p {
  color: #d1d5db;
}

.bitigci-about__wordline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 30px 0 34px;
}

.bitigci-about__word {
  min-height: 132px;
  padding: 20px;
  border: 1px solid #9ca3af;
  border-radius: 6px;
  background: #fff;
}

.bitigci-about__word strong {
  display: block;
  margin-bottom: 7px;
  color: var(--bitigci-teal);
  font-size: 25px;
  font-weight: 900;
}

.bitigci-about__word span {
  display: block;
  color: #374151;
  font-size: 16px;
  line-height: 1.55;
}

.bitigci-about__timeline {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.bitigci-about__timeline li {
  position: relative;
  padding: 2px 0 28px 42px;
  border-left: 2px solid #9ca3af;
}

.bitigci-about__timeline li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.bitigci-about__timeline li::before {
  position: absolute;
  top: 2px;
  left: -8px;
  width: 14px;
  height: 14px;
  border: 3px solid var(--bitigci-paper);
  border-radius: 50%;
  background: var(--bitigci-red);
  box-shadow: 0 0 0 1px var(--bitigci-red);
  content: "";
}

.bitigci-about__timeline strong {
  display: block;
  font-size: 19px;
  line-height: 1.4;
}

.bitigci-about__timeline span {
  display: block;
  max-width: 850px;
  margin-top: 6px;
  color: var(--bitigci-muted);
  font-size: 17px;
  line-height: 1.65;
}

.bitigci-about__principles,
.bitigci-about__system-grid,
.bitigci-about__sources {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.bitigci-about__principle,
.bitigci-about__system-item,
.bitigci-about__source {
  min-width: 0;
  padding: 22px;
  border: 1px solid #4b5563;
  border-radius: 6px;
  background: #1f2937;
}

.bitigci-about__principle i,
.bitigci-about__system-item i {
  width: 24px;
  height: 24px;
  margin-bottom: 14px;
  color: #5eead4;
}

.bitigci-about__principle h3,
.bitigci-about__system-item h3,
.bitigci-about__source h3 {
  margin: 0 0 9px;
  color: #fff;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
}

.bitigci-about__principle p,
.bitigci-about__system-item p,
.bitigci-about__source p {
  margin: 0;
  color: #d1d5db;
  font-size: 16px;
  line-height: 1.62;
}

.bitigci-about__system-grid .bitigci-about__system-item,
.bitigci-about__sources .bitigci-about__source {
  border-color: #d1d5db;
  background: #fff;
}

.bitigci-about__system-grid .bitigci-about__system-item h3,
.bitigci-about__sources .bitigci-about__source h3 {
  color: var(--bitigci-ink);
}

.bitigci-about__system-grid .bitigci-about__system-item p,
.bitigci-about__sources .bitigci-about__source p {
  color: var(--bitigci-muted);
}

.bitigci-about__system-grid .bitigci-about__system-item i {
  color: var(--bitigci-teal);
}

.bitigci-about__source a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  color: #0369a1;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.35;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.bitigci-about__source a i {
  width: 17px;
  height: 17px;
}

.bitigci-about__note {
  margin-top: 28px;
  padding: 20px 22px;
  border-left: 5px solid var(--bitigci-gold);
  background: #fffbeb;
  color: #713f12;
  font-size: 16px;
  line-height: 1.65;
}

.bitigci-about__byline {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  color: #374151;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
}

.bitigci-about__byline i {
  width: 22px;
  height: 22px;
  color: var(--bitigci-red);
}

.bitigci-about__article {
  width: min(860px, 100%);
}

.bitigci-about__article h2 {
  margin: 44px 0 14px;
  padding-top: 20px;
  border-top: 1px solid var(--bitigci-line);
  color: var(--bitigci-ink);
  font-size: 28px;
  font-weight: 850;
  line-height: 1.25;
}

.bitigci-about__article h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.bitigci-about__article p {
  margin: 0 0 18px;
  color: #374151;
  font-size: 19px;
  line-height: 1.8;
}

.bitigci-about__article strong {
  color: var(--bitigci-ink);
  font-weight: 800;
}

.bitigci-about__closing {
  margin-top: 38px;
  padding: 24px;
  border-left: 6px solid var(--bitigci-teal);
  background: #ecfdf5;
  color: #064e3b;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.7;
}

@media (max-width: 860px) {
  .bitigci-about__hero-inner {
    min-height: 0;
    grid-template-columns: minmax(0, 1fr) 150px;
    gap: 28px;
  }

  .bitigci-about__principles,
  .bitigci-about__system-grid,
  .bitigci-about__sources {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .bitigci-about__inner {
    width: min(100% - 24px, 1120px);
  }

  .bitigci-about__hero-inner {
    padding: 40px 0 38px;
    grid-template-columns: minmax(0, 1fr);
  }

  .bitigci-about__hero-mark {
    width: 130px;
    grid-row: 1;
    justify-self: start;
  }

  .bitigci-about__hero h1 {
    font-size: 43px;
  }

  .bitigci-about__lead {
    font-size: 18px;
  }

  .bitigci-about__article p {
    font-size: 18px;
  }

  .bitigci-about__band {
    padding: 42px 0;
  }

  .bitigci-about__section-head h2 {
    font-size: 28px;
  }

  .bitigci-about__wordline,
  .bitigci-about__principles,
  .bitigci-about__system-grid,
  .bitigci-about__sources {
    grid-template-columns: minmax(0, 1fr);
  }
}