/* ═══════════════════════════════════════════════════════════
   Pixton Learning Centre — shared stylesheet
   Palette taken directly from the book interiors:
   flat vector, solid fills, no gradients.
   ═══════════════════════════════════════════════════════════ */

:root {
  /* Solid brand colours — lifted from the illustration plates */
  --navy:        #1B3A5C;
  --navy-deep:   #142C46;
  --navy-light:  #2C5580;
  --yellow:      #FFC93C;
  --yellow-deep: #E8A916;
  --cream:       #FDF6E8;
  --cream-deep:  #F5E9D0;
  --coral:       #BC4C28;   /* AA on white (5.0:1), cream (4.7:1) and as button bg */
  --coral-bright:#E8734A;   /* decorative fills only, never text-bearing */
  --teal:        #2E8B8B;
  /* Per-volume accents, sampled from the printed covers */
  --chem-green:  #2C832F;   /* Chemistry cover frame */
  --chem-lime:   #96D732;   /* Chemistry cover inner panel */
  --ink:         #16232E;
  --ink-muted:   #4A5A68;
  --white:       #FFFFFF;
  --rule:        #DCD3C0;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --max: 1120px;
}

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: var(--font-body);
  background: var(--white);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
}

.wrap-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ─────────────── MASTHEAD ─────────────── */
.masthead {
  background: var(--navy);
  border-bottom: 5px solid var(--yellow);
}

.masthead-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.15rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.wordmark { text-decoration: none; display: flex; align-items: center; gap: 0.8rem; }

.wordmark .mark {
  width: 38px; height: 38px;
  flex-shrink: 0;
  background: var(--yellow);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}

.wordmark .mark svg { width: 24px; height: 24px; display: block; }

.wordmark .name {
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 600;
  color: var(--white);
  display: block;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.wordmark .estd {
  font-size: 0.64rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--yellow);
  font-weight: 600;
}

.masthead nav ul { list-style: none; display: flex; gap: 1.9rem; }

.masthead nav a {
  text-decoration: none;
  color: rgba(255,255,255,0.82);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.masthead nav a:hover { color: var(--white); border-bottom-color: var(--yellow); }
.masthead nav a.current { color: var(--yellow); border-bottom-color: var(--yellow); }

/* ─────────────── HERO ─────────────── */
.hero {
  background: var(--navy);
  color: var(--white);
  padding: 5.5rem 0 6rem;
  overflow: hidden;
}

.hero.cream  { background: var(--cream);  color: var(--ink); }
.hero.yellow { background: var(--yellow); color: var(--navy); }
.hero.teal   { background: var(--teal);   color: var(--white); }
.hero.coral  { background: var(--coral);  color: var(--white); }

.hero-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-eyebrow {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--yellow);
  margin-bottom: 1rem;
}

.hero.cream .hero-eyebrow  { color: var(--coral); }
.hero.yellow .hero-eyebrow { color: var(--navy); }
.hero.teal .hero-eyebrow,
.hero.coral .hero-eyebrow  { color: var(--yellow); }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 4.6vw, 3.15rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.hero .lede {
  font-size: 1.1rem;
  line-height: 1.75;
  opacity: 0.9;
  max-width: 52ch;
}

.hero-art { display: flex; justify-content: center; }
.hero-art svg { width: 100%; height: auto; max-width: 400px; display: block; }

/* Page hero — shorter, single column, for interior pages */
.pagehead {
  background: var(--navy);
  color: var(--white);
  padding: 3.4rem 0;
  border-bottom: 5px solid var(--yellow);
}

.pagehead.cream  { background: var(--cream);  color: var(--ink);  border-bottom-color: var(--coral); }
.pagehead.teal   { background: var(--teal);   color: var(--white); }
.pagehead.coral  { background: var(--coral);  color: var(--white); }
.pagehead.yellow { background: var(--yellow); color: var(--navy);  border-bottom-color: var(--navy); }

.pagehead .hero-eyebrow { margin-bottom: 0.7rem; }

.pagehead h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
}

.pagehead p {
  font-size: 1.05rem;
  line-height: 1.7;
  opacity: 0.9;
  max-width: 60ch;
}

/* ─────────────── SECTIONS ─────────────── */
section { padding: 5.5rem 0; }

section.band-cream { background: var(--cream); }
section.band-navy  { background: var(--navy);  color: var(--white); }
section.band-teal  { background: var(--teal);  color: var(--white); }
section.band-yellow{ background: var(--yellow); color: var(--navy); }

.section-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--coral);
  margin-bottom: 0.8rem;
}

.band-navy .section-label,
.band-teal .section-label { color: var(--yellow); }

h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.1vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.1rem;
}

h3 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 600; margin-bottom: 0.45rem; }

.prose { max-width: 66ch; }
.prose p { color: var(--ink-muted); margin-bottom: 1.05rem; line-height: 1.82; }
.prose p:last-child { margin-bottom: 0; }
.band-navy .prose p, .band-teal .prose p { color: rgba(255,255,255,0.85); }

.lead-para { font-size: 1.1rem; line-height: 1.8; }

/* ─────────────── CARD GRIDS ─────────────── */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }

.card {
  background: var(--white);
  border: 2px solid var(--navy);
  border-radius: 6px;
  padding: 2.1rem;
}

.card.filled-navy  { background: var(--navy);   color: var(--white); border-color: var(--navy); }
.card.filled-teal  { background: var(--teal);   color: var(--white); border-color: var(--teal); }
.card.filled-coral { background: var(--coral);  color: var(--white); border-color: var(--coral); }
.card.filled-yellow{ background: var(--yellow); color: var(--navy);  border-color: var(--navy); }
.card.filled-cream { background: var(--cream);  color: var(--ink);   border-color: var(--navy); }

.card .card-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1;
  display: block;
  margin-bottom: 0.7rem;
  color: var(--coral);
}

.card.filled-navy .card-num,
.card.filled-teal .card-num,
.card.filled-coral .card-num { color: var(--yellow); }

.card h3 { margin-bottom: 0.5rem; }
.card p { font-size: 0.925rem; line-height: 1.72; color: var(--ink-muted); }
.card.filled-navy p, .card.filled-teal p, .card.filled-coral p { color: rgba(255,255,255,0.85); }
.card.filled-yellow p { color: var(--navy); opacity: 0.85; }

.card-icon { width: 46px; height: 46px; margin-bottom: 0.9rem; }
.card-icon svg { width: 100%; height: 100%; display: block; }

/* ─────────────── STAT STRIP ─────────────── */
.stat-strip {
  background: var(--yellow);
  padding: 2.4rem 0;
}

.stat-strip .stats {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat .stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1;
  display: block;
}

.stat .stat-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--navy);
  opacity: 0.75;
  margin-top: 0.4rem;
  display: block;
}

/* ─────────────── VOLUME ROWS ─────────────── */
.volume {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 2.4rem;
  padding: 2.4rem;
  border: 2px solid var(--navy);
  border-radius: 6px;
  background: var(--white);
  margin-bottom: 2rem;
  align-items: start;
}

.volume:last-child { margin-bottom: 0; }

.vol-plate {
  width: 150px;
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  overflow: hidden;
  border: 2px solid var(--navy);
  background: var(--navy);
}

.vol-plate svg, .vol-plate img { width: 100%; height: 100%; display: block; }

.vol-meta {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--coral);
  margin-bottom: 0.4rem;
}

.volume h3 { font-size: 1.35rem; margin-bottom: 0.6rem; }

.vol-desc { font-size: 0.94rem; color: var(--ink-muted); line-height: 1.78; margin-bottom: 1.1rem; }

.vol-note {
  background: var(--cream);
  border-left: 4px solid var(--yellow);
  padding: 0.95rem 1.15rem;
  border-radius: 0 4px 4px 0;
  margin-bottom: 1.2rem;
}

.vol-note .note-label {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--navy);
  display: block;
  margin-bottom: 0.3rem;
}

.vol-note p { font-size: 0.885rem; color: var(--ink-muted); line-height: 1.75; }

.vol-actions { display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }

.vol-spec {
  font-size: 0.78rem;
  color: var(--ink-muted);
  padding-top: 0.9rem;
  margin-top: 0.9rem;
  border-top: 1px solid var(--rule);
}

/* ─────────────── BUTTONS ─────────────── */
.btn {
  display: inline-block;
  padding: 0.62rem 1.35rem;
  background: var(--coral);
  color: var(--white);
  border: 2px solid var(--coral);
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.btn:hover { background: #A63F1F; border-color: #A63F1F; }

.btn-navy { background: var(--navy); border-color: var(--navy); color: var(--white); }
.btn-navy:hover { background: var(--navy-deep); border-color: var(--navy-deep); }

.btn-yellow { background: var(--yellow); border-color: var(--navy); color: var(--navy); }
.btn-yellow:hover { background: var(--yellow-deep); border-color: var(--navy); }

.btn-outline { background: transparent; border-color: var(--white); color: var(--white); }
.btn-outline:hover { background: var(--white); color: var(--navy); }

.status-pill {
  display: inline-block;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  padding: 0.34rem 0.7rem;
  border-radius: 3px;
  background: var(--cream-deep);
  color: var(--ink-muted);
}

.status-pill.live { background: var(--teal); color: var(--white); }

/* ─────────────── FAQ ─────────────── */
.faq { border-top: 2px solid var(--navy); }

.faq-item {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1.55fr;
  gap: 2.5rem;
}

.faq-item h3 { font-size: 1.05rem; margin-bottom: 0; line-height: 1.4; }
.faq-item p { font-size: 0.925rem; color: var(--ink-muted); line-height: 1.82; }

/* ─────────────── CTA BAND ─────────────── */
.cta-band {
  background: var(--navy);
  color: var(--white);
  padding: 3.4rem 0;
  text-align: center;
}

.cta-band h2 { color: var(--white); margin-bottom: 0.7rem; }
.cta-band p { color: rgba(255,255,255,0.82); max-width: 54ch; margin: 0 auto 1.6rem; }

/* ─────────────── CONTACT ─────────────── */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.6rem; }
.contact-block h3 { font-size: 1.05rem; margin-bottom: 0.35rem; }
.contact-block p { font-size: 0.92rem; color: var(--ink-muted); margin-bottom: 0.4rem; }
.contact-block a { color: var(--coral); font-weight: 600; text-decoration: none; font-size: 0.92rem; }
.contact-block a:hover { text-decoration: underline; }

/* ─────────────── FOOTER ─────────────── */
footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 2rem;
  font-size: 0.85rem;
  border-top: 5px solid var(--yellow);
}

.footer-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2rem;
}

footer .imprint-name {
  font-family: var(--font-display);
  color: var(--white);
  font-size: 1.05rem;
  font-weight: 600;
  display: block;
  margin-bottom: 0.45rem;
}

footer h4 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--yellow);
  font-weight: 700;
  margin-bottom: 0.7rem;
}

footer ul { list-style: none; }
footer li { margin-bottom: 0.4rem; }
footer a { color: rgba(255,255,255,0.78); text-decoration: none; }
footer a:hover { color: var(--white); text-decoration: underline; }

.footer-legal {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.4rem 2rem 0;
  border-top: 1px solid rgba(255,255,255,0.14);
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
}

/* ─────────────── RESPONSIVE ─────────────── */
@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-art svg { max-width: 280px; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stat-strip .stats { grid-template-columns: 1fr 1fr; gap: 1.6rem; }
}

@media (max-width: 680px) {
  .wrap, .wrap-narrow, .masthead-inner, .hero-grid, .footer-grid, .footer-legal, .stat-strip .stats {
    padding-left: 1.25rem; padding-right: 1.25rem;
  }
  .masthead-inner { flex-direction: column; align-items: flex-start; gap: 0.9rem; }
  .masthead nav ul { gap: 1.1rem; flex-wrap: wrap; }
  .hero { padding: 2.75rem 0 3rem; }
  .pagehead { padding: 2.4rem 0; }
  section { padding: 3.25rem 0; }
  .grid-3, .grid-2, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .volume { grid-template-columns: 1fr; gap: 1.25rem; padding: 1.4rem; }
  .vol-plate { width: 120px; }
  .faq-item { grid-template-columns: 1fr; gap: 0.5rem; }
}


/* ─────────────── ACCESSIBILITY ─────────────── */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  background: var(--yellow);
  color: var(--navy);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 4px 0;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
  border-radius: 2px;
}
.masthead :focus-visible { outline-color: var(--yellow); }
.band-navy :focus-visible,
.hero :focus-visible,
footer :focus-visible { outline-color: var(--yellow); }
.hero.yellow :focus-visible,
.pagehead.yellow :focus-visible,
.band-yellow :focus-visible { outline-color: var(--navy); }

/* Remove default outline only where we've supplied a visible replacement */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible) { outline: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ─────────────── MOBILE NAV ─────────────── */
.nav-toggle {
  display: none;
  background: transparent;
  border: 2px solid rgba(255,255,255,0.45);
  border-radius: 4px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-toggle:hover { border-color: var(--yellow); color: var(--yellow); }
.nav-toggle .bars { display: block; width: 16px; height: 10px; position: relative; }
.nav-toggle .bars::before,
.nav-toggle .bars::after,
.nav-toggle .bars span {
  content: ""; position: absolute; left: 0; width: 100%; height: 2px;
  background: currentColor; border-radius: 2px;
}
.nav-toggle .bars::before { top: 0; }
.nav-toggle .bars span { top: 4px; }
.nav-toggle .bars::after { bottom: 0; }

/* ─────────────── EMAIL CAPTURE ─────────────── */
.notify {
  background: var(--cream);
  border: 2px solid var(--navy);
  border-radius: 6px;
  padding: 1.1rem 1.25rem;
  margin-top: 0.4rem;
}
.notify .notify-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--navy);
  display: block;
  margin-bottom: 0.3rem;
}
.notify p { font-size: 0.875rem; color: var(--ink-muted); margin-bottom: 0.8rem; line-height: 1.7; }
.notify-form { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.notify-form input[type="email"] {
  flex: 1 1 220px;
  min-width: 0;
  padding: 0.6rem 0.8rem;
  border: 2px solid var(--navy);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink);
  background: #fff;
}
.notify-form input[type="email"]::placeholder { color: #8A938C; }
.notify-form button {
  padding: 0.6rem 1.15rem;
  background: var(--navy);
  color: #fff;
  border: 2px solid var(--navy);
  border-radius: 4px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
}
.notify-form button:hover { background: var(--navy-deep); border-color: var(--navy-deep); }
.notify .fine { font-size: 0.74rem; color: var(--ink-muted); margin: 0.6rem 0 0; }

/* ─────────────── TRUST ROW ─────────────── */
.trust-row {
  background: var(--navy);
  padding: 1.5rem 0;
}
.trust-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: center;
  gap: 2.75rem;
  flex-wrap: wrap;
}
.trust-item {
  display: flex; align-items: center; gap: 0.6rem;
  color: #fff; font-size: 0.875rem; font-weight: 500;
}
.trust-item svg { width: 20px; height: 20px; flex-shrink: 0; }

/* ─────────────── PLATE GALLERY ─────────────── */
.plate-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.plate-pair img {
  width: 100%; border: 3px solid var(--yellow); border-radius: 6px; background: #fff;
}
.plate-caption {
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.1em;
  font-weight: 600; opacity: 0.75; margin-top: 0.45rem; text-align: center;
}

/* ─────────────── GEO NOTE ─────────────── */
.geo-note {
  font-size: 0.78rem;
  color: var(--ink-muted);
  margin-top: 0.7rem;
  line-height: 1.6;
}
.geo-note a { color: var(--coral); font-weight: 600; text-decoration: none; }
.geo-note a:hover { text-decoration: underline; }

/* ─────────────── 404 ─────────────── */
.notfound { text-align: center; padding: 5rem 0 4rem; }
.notfound h1 { font-family: var(--font-display); font-size: clamp(2rem,5vw,3rem); margin-bottom: 0.8rem; }
.notfound p { color: var(--ink-muted); max-width: 46ch; margin: 0 auto 1.6rem; }

@media (max-width: 680px) {
  .masthead-inner { flex-direction: row; align-items: center; justify-content: space-between; }
  .nav-toggle { display: inline-flex; }
  .masthead nav {
    display: none;
    flex-basis: 100%;
    order: 3;
    padding-top: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.18);
    margin-top: 0.9rem;
  }
  .masthead nav.open { display: block; }
  .masthead nav ul { flex-direction: column; gap: 0; }
  .masthead nav li { border-bottom: 1px solid rgba(255,255,255,0.1); }
  .masthead nav li:last-child { border-bottom: none; }
  .masthead nav a { display: block; padding: 0.7rem 0; border-bottom: none; }
  .masthead nav a.current { border-bottom: none; }
  .trust-inner { flex-direction: column; gap: 0.85rem; align-items: flex-start; padding: 0 1.25rem; }
}


/* ═══════════════════════════════════════════════════════════
   NARRATIVE STAGES — one idea per screen, product revealed last
   ═══════════════════════════════════════════════════════════ */

.stage {
  padding: 8rem 0;
  text-align: center;
  overflow: hidden;
}

.stage-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2rem;
}

.stage.tall    { padding: 10rem 0; }
.stage.white   { background: #fff;          color: var(--ink); }
.stage.ink     { background: #0E1519;       color: #fff; }
.stage.navy    { background: var(--navy);   color: #fff; }
.stage.cream   { background: var(--cream);  color: var(--ink); }
.stage.yellow  { background: var(--yellow); color: var(--navy); }
.stage.teal    { background: var(--teal);   color: #fff; }

/* Kicker — the small line that sets up the big claim */
.kicker {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-weight: 700;
  opacity: 0.6;
  margin-bottom: 1.6rem;
}
.stage.ink .kicker, .stage.navy .kicker, .stage.teal .kicker { color: var(--yellow); opacity: 1; }
.stage.white .kicker, .stage.cream .kicker { color: var(--coral); opacity: 1; }

/* The claim — one sentence, very large */
.claim {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.3rem, 7vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  margin: 0 auto;
  max-width: 20ch;
  text-wrap: balance;
}

.claim.wide { max-width: 26ch; }

/* Supporting line — at most two sentences, never more */
.support {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.6;
  max-width: 46ch;
  margin: 1.8rem auto 0;
  opacity: 0.78;
}

/* Proof number, used sparingly */
.proof {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 11vw, 7rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
  display: block;
}
.proof-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 600;
  opacity: 0.65;
  margin-top: 0.8rem;
  display: block;
}

/* Full-bleed stage imagery */
.stage-art { margin: 3.5rem auto 0; max-width: 760px; }
.stage-art.narrow { max-width: 420px; }
.stage-art svg, .stage-art img { width: 100%; height: auto; display: block; }

.stage-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.6rem;
  max-width: 660px;
  margin: 3.5rem auto 0;
}
.stage-pair img {
  width: 100%; border-radius: 10px; display: block;
  box-shadow: 0 18px 50px rgba(0,0,0,0.28);
}
.stage-pair .cap {
  font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.14em;
  font-weight: 700; opacity: 0.6; margin-top: 0.9rem;
}

/* Text links in Apple's idiom — no buttons competing in the narrative */
.stage-links {
  margin-top: 2.4rem;
  display: flex; gap: 2.2rem; justify-content: center; flex-wrap: wrap;
}
.textlink {
  font-size: 1.02rem; font-weight: 600; text-decoration: none;
  color: var(--coral); display: inline-flex; align-items: center; gap: 0.3rem;
}
.textlink::after { content: "\203A"; font-size: 1.15em; line-height: 1; }
.textlink:hover { text-decoration: underline; }
.stage.ink .textlink, .stage.navy .textlink, .stage.teal .textlink { color: var(--yellow); }
.stage.yellow .textlink { color: var(--navy); }

/* ── PRODUCT REVEAL ── */
.product-stage { padding: 7rem 0; background: var(--cream); }

.product-row {
  max-width: 1000px; margin: 0 auto; padding: 0 2rem;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 4rem; align-items: center;
}
.product-row + .product-row { margin-top: 7rem; }
.product-row.flip .product-art { order: 2; }

.product-art img, .product-art svg {
  width: 100%; max-width: 360px; height: auto; display: block;
  margin: 0 auto; border-radius: 10px;
  box-shadow: 0 22px 60px rgba(20,44,70,0.22);
}

.product-copy .vol-index {
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.2em;
  font-weight: 700; color: var(--coral); margin-bottom: 0.9rem;
}
.product-copy h3 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 600; letter-spacing: -0.025em; line-height: 1.1;
  margin-bottom: 0.9rem;
}
.product-copy .oneline {
  font-size: 1.1rem; line-height: 1.6; color: var(--ink-muted); margin-bottom: 1.4rem;
}
.product-copy .price {
  font-size: 0.95rem; font-weight: 600; color: var(--ink); margin-bottom: 1.3rem;
}
.product-copy .price .muted { color: var(--ink-muted); font-weight: 400; }

/* ── SPEC TABLE, last before the buy ── */
.spec-table {
  max-width: 760px; margin: 0 auto; padding: 0 2rem;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 2.5rem;
  text-align: center;
}
.spec-cell .spec-val {
  font-family: var(--font-display); font-size: 1.7rem; font-weight: 600;
  display: block; line-height: 1.1;
}
.spec-cell .spec-key {
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.14em;
  font-weight: 600; opacity: 0.6; margin-top: 0.5rem; display: block;
}

/* ── SCROLL REVEAL ── */
.reveal { opacity: 0; transform: translateY(26px); }
.reveal.in { opacity: 1; transform: none; transition: opacity 0.75s ease, transform 0.75s ease; }
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal.in { opacity: 1; transform: none; transition: none; }
}
.no-js .reveal { opacity: 1; transform: none; }

/* ── STICKY TRANSLUCENT NAV ── */
.masthead.sticky {
  position: sticky; top: 0; z-index: 100;
  background: rgba(27,58,92,0.86);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
}

@media (max-width: 680px) {
  .stage { padding: 4.5rem 0; }
  .stage.tall { padding: 5.5rem 0; }
  .product-stage { padding: 4rem 0; }
  .product-row { grid-template-columns: 1fr; gap: 2.2rem; text-align: center; }
  .product-row.flip .product-art { order: 0; }
  .product-row + .product-row { margin-top: 4rem; }
  .product-copy .oneline { margin-left: auto; margin-right: auto; max-width: 40ch; }
  .spec-table { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .stage-pair { gap: 1rem; margin-top: 2.4rem; }
  .stage-links { gap: 1.4rem; }
}


/* ═══════════════════════════════════════════════════════════
   COVER PRESENTATION — real book covers, portrait 8.5x11
   ═══════════════════════════════════════════════════════════ */

.cover {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
  border-radius: 4px;
  box-shadow: 0 20px 44px rgba(20,44,70,0.30), 0 2px 6px rgba(20,44,70,0.18);
}

.cover-lg { max-width: 380px; }
.cover-sm { max-width: 190px; }

/* Stand-in used only where a printed cover does not exist yet */
.cover-pending {
  width: 100%; max-width: 300px; margin: 0 auto;
  aspect-ratio: 342 / 442;
  border-radius: 4px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 0.6rem;
  background: var(--navy);
  border: 2px dashed rgba(255,255,255,0.32);
  color: rgba(255,255,255,0.75);
  text-align: center; padding: 1.5rem;
}
.cover-pending svg { width: 54px; height: 54px; opacity: 0.85; }
.cover-pending span {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; font-weight: 700;
}

/* Volume stage takes its colour from its own cover */
.stage.vol-chem { background: var(--chem-green); color: #fff; }
.stage.vol-chem .kicker { color: #EAFBD2; opacity: 1; }
.stage.vol-chem .textlink { color: #EAFBD2; }

.product-row .cover { max-width: 280px; }

/* ── SIDE-BY-SIDE NARRATIVE (image left, copy right) ── */
.split {
  max-width: 1000px; margin: 0 auto; padding: 0 2rem;
  display: grid; grid-template-columns: 1fr 1.15fr;
  gap: 4rem; align-items: center; text-align: left;
}
.split.flip .split-art { order: 2; }
.split h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  font-weight: 600; letter-spacing: -0.025em; line-height: 1.12;
  margin-bottom: 1rem;
}
.split p { font-size: 1.03rem; line-height: 1.75; opacity: 0.8; margin-bottom: 0.9rem; }
.split p:last-child { margin-bottom: 0; }
.split .kicker { margin-bottom: 1rem; }

/* ── NUMBERED STEP STACK ── */
.steps { max-width: 760px; margin: 3.5rem auto 0; text-align: left; }
.step {
  display: grid; grid-template-columns: 62px 1fr;
  gap: 1.6rem; padding: 2rem 0;
  border-top: 1px solid currentColor;
}
.step:first-child { border-top: none; padding-top: 0; }
.step .step-n {
  font-family: var(--font-display); font-size: 2rem; font-weight: 600;
  line-height: 1; opacity: 0.45;
}
.step h3 {
  font-family: var(--font-display); font-size: 1.3rem; font-weight: 600;
  margin-bottom: 0.4rem; letter-spacing: -0.015em;
}
.step p { font-size: 1rem; line-height: 1.72; opacity: 0.78; }

/* ── Q&A STACK ── */
.qa { max-width: 760px; margin: 3rem auto 0; text-align: left; }
.qa-item { padding: 1.9rem 0; border-top: 1px solid var(--rule); }
.qa-item:first-child { border-top: none; }
.qa-item h3 {
  font-family: var(--font-display); font-size: 1.22rem; font-weight: 600;
  letter-spacing: -0.015em; margin-bottom: 0.55rem;
}
.qa-item p { font-size: 1rem; line-height: 1.78; color: var(--ink-muted); }

@media (max-width: 680px) {
  .split { grid-template-columns: 1fr; gap: 2.2rem; text-align: center; }
  .split.flip .split-art { order: 0; }
  .split p { margin-left: auto; margin-right: auto; max-width: 42ch; }
  .step { grid-template-columns: 44px 1fr; gap: 1rem; padding: 1.5rem 0; }
  .step .step-n { font-size: 1.5rem; }
  .cover-lg, .cover { max-width: 240px; }
}