/* ============================================
   The Ping — an illustrated story
   Night-journey palette, storybook serif type
   ============================================ */

:root {
  --night:      #0e1428;   /* deep night blue */
  --night-2:    #141a2e;
  --panel:      #1c2545;
  --line:       #26304f;
  --ink:        #e8ecf7;   /* page text */
  --ink-dim:    #8ea0c9;   /* soft blue */
  --lamplight:  #ffd97a;   /* the packet's glow */
  --signal:     #7ee787;

  --font-display: "Fraunces", Georgia, serif;
  --font-body:    "Source Sans 3", system-ui, sans-serif;

  --measure: 620px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1200px 600px at 70% -10%, #1a2342 0%, var(--night) 55%);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--line);
}

.masthead__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--lamplight);
  letter-spacing: 0.02em;
}

.masthead__label {
  font-size: 0.8rem;
  color: var(--ink-dim);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- cover ---------- */

.cover {
  max-width: 760px;
  margin: 3.5rem auto 1rem;
  padding: 0 1.5rem;
  text-align: center;
}

.cover__art {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 1.5rem;
}

.cover__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 9vw, 5.5rem);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.cover__subtitle {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
  color: var(--ink-dim);
  margin-top: 0.6rem;
}

.cover__byline {
  margin-top: 1.6rem;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ---------- chapters ---------- */

.chapter {
  max-width: var(--measure);
  margin: 4.5rem auto 0;
  padding: 0 1.5rem;
}

.chapter__art {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  margin-bottom: 2rem;
  border: 1px solid var(--line);
}

.chapter__number {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lamplight);
  margin-bottom: 0.5rem;
}

.chapter__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 4.5vw, 2.3rem);
  margin-bottom: 1.2rem;
  color: var(--ink);
}

.chapter p + p { margin-top: 1.1rem; }

.chapter em { color: var(--lamplight); font-style: italic; }

.chapter__callout {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.92rem;
  color: var(--signal);
  background: var(--night-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.8rem 1.1rem;
  margin-top: 1.4rem !important;
  letter-spacing: 0.04em;
}

.chapter__end {
  margin-top: 2.2rem !important;
  text-align: center;
  color: var(--ink-dim);
  font-family: var(--font-display);
  font-style: italic;
  letter-spacing: 0.1em;
}

/* ---------- colophon ---------- */

.colophon {
  max-width: var(--measure);
  margin: 5rem auto 0;
  padding: 1.8rem 1.5rem;
  border-top: 1px solid var(--line);
}

.colophon__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: 0.8rem;
  color: var(--ink);
}

.colophon p { color: var(--ink-dim); font-size: 0.98rem; }
.colophon p + p { margin-top: 0.8rem; }

.colophon a { color: var(--lamplight); }

.colophon__meta { font-size: 0.85rem; letter-spacing: 0.03em; }

/* ---------- footer ---------- */

.footer {
  max-width: var(--measure);
  margin: 3rem auto 0;
  padding: 1.4rem 1.5rem 2.6rem;
  color: var(--ink-dim);
  font-size: 0.82rem;
  text-align: center;
}

/* ---------- reveal on scroll ---------- */

.chapter, .colophon {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.chapter.is-visible, .colophon.is-visible {
  opacity: 1;
  transform: none;
}

/* no-js and reduced motion: everything visible, no movement */

.no-observer .chapter, .no-observer .colophon { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .chapter, .colophon { opacity: 1; transform: none; transition: none; }
}

a:focus-visible { outline: 2px solid var(--lamplight); outline-offset: 3px; }