/* ═══════════════════════════════════════════════════
   Signal — Two open-source artifacts of the thesis
   Portfolio v3 · 2026
   ═══════════════════════════════════════════════════ */

.signal {
  background: var(--surface-base);
  padding: clamp(5rem, 10vh, 8rem) clamp(1.5rem, 5vw, 5rem);
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

/* Subtle warm bloom behind the content — echoes statement__lamp */
.signal::before {
  content: '';
  position: absolute;
  top: 12%;
  left: 50%;
  transform: translateX(-50%);
  width: 85%;
  max-width: 780px;
  aspect-ratio: 3 / 2;
  background: radial-gradient(
    ellipse at center,
    oklch(62% 0.18 35 / 0.06),
    transparent 70%
  );
  pointer-events: none;
  z-index: -1;
}

.signal__inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
}

/* ═══ Eyebrow — centered section label ═══ */
.signal__eyebrow {
  display: block;
  width: fit-content;
  margin: 0 auto clamp(3rem, 6vh, 4.5rem);
  padding-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-faint);
}

/* ═══ Project block ═══ */
.signal__project {
  display: block;
}

.signal__project-name {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.5rem, 2.6vw, 1.95rem);
  font-weight: 400;
  color: var(--accent);
  text-align: center;
  margin: 0 0 clamp(1.25rem, 2.5vh, 1.75rem);
  letter-spacing: 0.01em;
  line-height: 1;
}

.signal__body {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0 auto 1.15rem;
  max-width: 58ch;
  text-align: left;
}

.signal__body--coda {
  color: var(--text-muted);
  font-style: italic;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.55;
  margin-bottom: clamp(1.75rem, 3.5vh, 2.4rem);
  max-width: 54ch;
}

.signal__body--coda em {
  font-style: normal;
  color: var(--text-secondary);
}

/* ═══ CTA — centered button ═══ */
.signal__cta-wrap {
  text-align: center;
}

.signal__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  text-decoration: none;
  padding: 0.75rem 1.4rem;
  border: 1px solid var(--border-light);
  border-radius: 100px;
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
  min-height: 44px;
}

.signal__cta:hover,
.signal__cta:focus-visible {
  color: var(--accent-hover);
  border-color: oklch(62% 0.18 35 / 0.35);
  background: var(--accent-subtle);
}

.signal__cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.signal__cta-arrow {
  display: inline-block;
  transition: transform 0.3s var(--ease-out);
}

.signal__cta:hover .signal__cta-arrow,
.signal__cta:focus-visible .signal__cta-arrow {
  transform: translateX(4px);
}

/* ═══ Chapter break between projects ═══ */
.signal__break {
  display: block;
  width: 48px;
  height: 1px;
  margin: clamp(5rem, 9vh, 7rem) auto;
  background: var(--border-light);
  opacity: 0.5;
}

/* ═══ Responsive ═══ */
@media (max-width: 600px) {
  .signal {
    padding: 4rem 1.25rem;
  }
  .signal__project-name {
    font-size: 1.35rem;
  }
  .signal__body {
    font-size: 0.95rem;
  }
  .signal__body--coda {
    font-size: 1rem;
  }
  .signal__break {
    margin: 2.75rem auto;
  }
  /* Tighten the GitHub pill so the full URL doesn't clip on narrow viewports */
  .signal__cta {
    font-size: 0.62rem;
    letter-spacing: 0.08em;
    padding: 0.7rem 1.1rem;
    gap: 0.5rem;
  }
}

/* Extra-narrow viewports (< 360px) — one more notch tighter */
@media (max-width: 360px) {
  .signal__cta {
    font-size: 0.58rem;
    letter-spacing: 0.05em;
    padding: 0.65rem 0.95rem;
  }
}

/* ═══ Reduced motion ═══ */
@media (prefers-reduced-motion: reduce) {
  .signal__cta,
  .signal__cta-arrow {
    transition: none;
  }
}