/* chapters.css — editorial "chapter" layout system
   Theme-agnostic. Colors pulled from CSS custom properties so any page
   can opt in by (a) loading this file and (b) setting:
     --chapter-bg              page background (default: #0a0f12)
     --chapter-accent          kicker/arrow color (default: #c6893f)
     --chapter-accent-soft     lighter accent for links (default: accent)
     --chapter-text-strong     headline/body color (default: #f2f4f6)
     --chapter-text-soft       lead paragraph color (default: rgba(...))
     --chapter-text-muted      scroll/meta color
     --chapter-display-font    big headlines (default: Cal Sans)
     --chapter-label-font      kickers (default: Black Ops One)
     --chapter-body-font       body text (default: Rubik)
*/

:where(:root) {
  --chapter-bg: #0a0f12;
  --chapter-accent: #c6893f;
  --chapter-accent-soft: #e7c08a;
  --chapter-text-strong: #f2f4f6;
  --chapter-text-soft: rgba(230, 235, 238, 0.8);
  --chapter-text-muted: rgba(204, 212, 219, 0.6);
  --chapter-display-font: "Cal Sans", "Inter", sans-serif;
  --chapter-label-font: "Black Ops One", "Rubik", sans-serif;
  --chapter-body-font: "Rubik", "Inter", sans-serif;
}

/* Pages using this system need their main to be full-width. Scope the
   override to an opt-in class so it doesn't leak to other pages. */
body.rk-chapter-page {
  background: var(--chapter-bg);
  color: var(--chapter-text-strong);
}

body.rk-chapter-page main#main-content {
  display: block;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
  background: var(--chapter-bg);
}

body.rk-chapter-page main#main-content > section {
  margin: 0;
}

/* ── Typography primitives ── */
.rk-chapter-kicker {
  font-family: var(--chapter-label-font);
  font-size: clamp(13px, 1vw, 16px);
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--chapter-accent);
  margin: 0 0 clamp(20px, 3vw, 36px);
  display: inline-block;
}

.rk-chapter-title {
  font-family: var(--chapter-display-font);
  font-size: clamp(44px, 6.5vw, 112px);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.02;
  margin: 0;
  color: var(--chapter-text-strong);
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: manual;
}

.rk-chapter-title--hero {
  font-size: clamp(64px, 12vw, 192px);
  letter-spacing: -0.022em;
  line-height: 1;
}

.rk-chapter-lead {
  font-family: var(--chapter-body-font);
  font-size: clamp(17px, 1.3vw, 22px);
  line-height: 1.55;
  color: var(--chapter-text-soft);
  max-width: 52ch;
  margin: clamp(24px, 3vw, 40px) 0 0;
}

.rk-chapter-cta {
  font-family: var(--chapter-body-font);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--chapter-text-strong);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(32px, 4vw, 56px);
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(242, 244, 246, 0.2);
  transition: color 0.3s ease, border-color 0.3s ease, gap 0.3s ease;
}

.rk-chapter-cta::after {
  content: "→";
  font-size: 16px;
  letter-spacing: 0;
  transition: transform 0.3s ease;
}

.rk-chapter-cta:hover,
.rk-chapter-cta:focus-visible {
  color: var(--chapter-accent);
  border-color: var(--chapter-accent);
  gap: 20px;
}

/* ── Hero ── */
.rk-chapter-hero {
  min-height: 100svh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: clamp(80px, 10vh, 140px) clamp(24px, 6vw, 96px) clamp(40px, 6vh, 80px);
  background: var(--chapter-bg);
  position: relative;
  overflow: hidden;
}

.rk-chapter-hero__backdrop {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 30%, color-mix(in srgb, var(--chapter-accent) 10%, transparent), transparent 60%);
  pointer-events: none;
}

.rk-chapter-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  gap: 0;
}

.rk-chapter-hero__wordmark {
  width: min(480px, 70vw);
  height: auto;
  margin: 0 0 clamp(20px, 3vw, 36px);
  filter: drop-shadow(0 10px 40px color-mix(in srgb, var(--chapter-accent) 25%, transparent));
}

.rk-chapter-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: clamp(32px, 4vw, 48px);
}

.rk-chapter-hero__actions .rk-store-badge img {
  height: 48px;
  width: auto;
}

.rk-chapter-hero__meta {
  font-family: var(--chapter-body-font);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--chapter-text-muted);
  margin-top: clamp(24px, 3vw, 36px);
  text-transform: uppercase;
}

.rk-chapter-hero__meta strong {
  color: var(--chapter-accent);
  font-weight: 500;
}

.rk-chapter-hero__scroll {
  position: relative;
  z-index: 1;
  justify-self: center;
  align-self: end;
  color: var(--chapter-text-muted);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  text-decoration: none;
  display: grid;
  justify-items: center;
  gap: 10px;
  animation: rk-chapter-bob 2.4s ease-in-out infinite;
}

.rk-chapter-hero__scroll::after {
  content: "";
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--chapter-accent), transparent);
}

@keyframes rk-chapter-bob {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* ── Split-media chapter ── */
.rk-chapter {
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
  background: var(--chapter-bg);
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* Default: media fills the half edge-to-edge (Fractal-style) */
.rk-chapter__media {
  position: relative;
  overflow: hidden;
  padding: 0;
  background: var(--chapter-bg);
  min-width: 0;
}

.rk-chapter__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 0;
  max-width: none;
}

/* Soft gradient fade on the edge adjacent to the text column.
   Default layout: media on left, text on right → fade the right edge of media.
   .flip layout: media on right, text on left → fade the left edge of media. */
.rk-chapter__media::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: clamp(120px, 18%, 260px);
  background: linear-gradient(to right, transparent, var(--chapter-bg));
  pointer-events: none;
  z-index: 1;
}

.rk-chapter.flip .rk-chapter__media::after {
  right: auto;
  left: 0;
  background: linear-gradient(to left, transparent, var(--chapter-bg));
}

/* Phone variant's own radial bg is its feature — skip the extra fade */
.rk-chapter__media--phone::after {
  display: none;
}

/* Give the copy column a positioning context so the wordmark can layer behind it */
.rk-chapter__copy {
  position: relative;
  isolation: isolate;
}

.rk-chapter__copy > *:not(.rk-chapter-wordmark) {
  position: relative;
  z-index: 1;
}

/* Large ghost wordmark sits BEHIND the copy as a watermark signature */
.rk-chapter-wordmark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: auto;
  height: auto;
  max-width: min(560px, 90%);
  max-height: clamp(160px, 22vw, 320px);
  object-fit: contain;
  opacity: 0.08;
  filter: grayscale(20%);
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 0;
}

.rk-chapter:hover .rk-chapter-wordmark {
  opacity: 0.14;
}

/* Phone screenshots: the column itself fills edge-to-edge (background
   gradient), but the screenshot stays contained within it — no stretch,
   no crop, aspect ratio preserved, centered. */
.rk-chapter__media--phone {
  padding: clamp(32px, 4vh, 64px) clamp(24px, 4vw, 60px);
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at 50% 50%, color-mix(in srgb, var(--chapter-accent) 20%, transparent), transparent 65%),
    linear-gradient(180deg, color-mix(in srgb, var(--chapter-accent) 8%, var(--chapter-bg)), var(--chapter-bg));
}

.rk-chapter__media--phone img {
  width: auto;
  height: auto;
  max-width: min(90%, 440px);
  max-height: 85%;
  object-fit: contain;
  border-radius: 42px;
  filter: drop-shadow(0 40px 80px rgba(4, 8, 12, 0.7)) drop-shadow(0 0 40px color-mix(in srgb, var(--chapter-accent) 18%, transparent));
}

.rk-chapter__copy {
  display: grid;
  align-content: center;
  padding: clamp(60px, 8vh, 120px) clamp(32px, 6vw, 96px);
  max-width: 720px;
  min-width: 0; /* let grid column shrink so long words can wrap */
  overflow-wrap: break-word;
}

.rk-chapter.flip {
  grid-template-columns: 1fr 1fr;
}

.rk-chapter.flip .rk-chapter__media {
  order: 2;
}

.rk-chapter.flip .rk-chapter__copy {
  order: 1;
  justify-self: end;
}

/* ── Full-bleed chapter ── */
.rk-chapter--full {
  min-height: 100svh;
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  padding: clamp(80px, 12vh, 160px) clamp(24px, 6vw, 96px);
  background: var(--chapter-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  position: relative;
  overflow: hidden;
}

.rk-chapter--full .rk-chapter-lead {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.rk-chapter--full::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, color-mix(in srgb, var(--chapter-accent) 6%, transparent), transparent 60%);
  pointer-events: none;
}

.rk-chapter--full > * {
  position: relative;
  z-index: 1;
}

/* Themed RoxyKovu logo displayed above the philosophy headline */
.rk-chapter-philosophy-logo {
  display: block;
  width: clamp(96px, 10vw, 144px);
  height: auto;
  margin: 0 auto clamp(28px, 3vw, 40px);
  filter: drop-shadow(0 10px 40px color-mix(in srgb, var(--chapter-accent) 30%, transparent));
  animation: rk-chapter-philosophy-float 6s ease-in-out infinite;
}

@keyframes rk-chapter-philosophy-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@media (prefers-reduced-motion: reduce) {
  .rk-chapter-philosophy-logo { animation: none; }
}

/* Pill-list for devices/tests/etc. */
.rk-chapter-list {
  list-style: none;
  padding: 0;
  margin: clamp(20px, 3vw, 36px) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(12px, 2vw, 28px);
  justify-content: center;
}

.rk-chapter-list li {
  font-family: var(--chapter-display-font);
  font-size: clamp(20px, 2.4vw, 36px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--chapter-text-soft);
  padding: 8px 22px;
  border: 1px solid rgba(242, 244, 246, 0.12);
  border-radius: 999px;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.rk-chapter-list li:hover {
  border-color: var(--chapter-accent);
  color: var(--chapter-text-strong);
}

/* ── Closer ── */
.rk-chapter-closer {
  min-height: 100svh;
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  padding: clamp(80px, 12vh, 160px) clamp(24px, 6vw, 96px);
  background: var(--chapter-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  position: relative;
  overflow: hidden;
}

.rk-chapter-closer__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(24px, 4vw, 64px);
  margin-top: clamp(40px, 5vw, 72px);
  opacity: 0.72;
}

.rk-chapter-closer__logos img {
  height: clamp(48px, 6vw, 80px);
  width: auto;
  filter: grayscale(100%) brightness(1.6);
}

.rk-chapter-closer__x {
  font-family: var(--chapter-display-font);
  font-size: clamp(24px, 3vw, 40px);
  color: var(--chapter-text-muted);
  font-weight: 300;
}

.rk-chapter-closer__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: clamp(40px, 5vw, 64px);
}

.rk-chapter-closer__badges .rk-store-badge img {
  height: 52px;
  width: auto;
}

/* Horizontal app-logo row. Each card shows the logo + name; hovering expands
   the card downward to reveal its store-badge links. */
.rk-chapter-downloads {
  list-style: none;
  padding: 0;
  margin: clamp(48px, 6vw, 80px) auto 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(14px, 1.4vw, 22px);
  align-items: stretch;
  max-width: 1200px;
}

.rk-chapter-downloads li {
  flex: 0 0 auto;
  width: clamp(140px, 14vw, 180px);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(20px, 2vw, 28px) 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.025);
  transition: border-color 0.35s ease, background 0.35s ease, transform 0.35s ease;
  overflow: hidden;
}

.rk-chapter-downloads li:hover,
.rk-chapter-downloads li:focus-within {
  border-color: color-mix(in srgb, var(--chapter-accent) 55%, transparent);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-4px);
}

.rk-chapter-downloads__logo {
  width: clamp(68px, 7vw, 96px);
  height: clamp(68px, 7vw, 96px);
  object-fit: contain;
  border-radius: 20px;
  display: block;
}

.rk-chapter-downloads__name {
  font-family: var(--chapter-display-font);
  font-size: clamp(15px, 1.2vw, 18px);
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--chapter-text-strong);
  margin-top: 14px;
  text-align: center;
  line-height: 1.25;
  min-height: 2.5em;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Collapsed by default: badges hidden below the fold-line of the card */
.rk-chapter-downloads__reveal {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s ease, margin-top 0.4s ease, opacity 0.35s ease;
  width: 100%;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
}

.rk-chapter-downloads li:hover .rk-chapter-downloads__reveal,
.rk-chapter-downloads li:focus-within .rk-chapter-downloads__reveal {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 16px;
}

.rk-chapter-downloads__reveal > div {
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.rk-chapter-downloads__reveal .rk-store-badge {
  display: block;
}

.rk-chapter-downloads__reveal .rk-store-badge img {
  width: 100%;
  height: auto;
  max-height: 44px;
  object-fit: contain;
  display: block;
}

.rk-chapter-downloads__note {
  font-family: var(--chapter-label-font);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--chapter-text-muted);
  text-align: center;
  padding: 10px 0;
}

/* Pricing/monetization tag shown inside the hover-expanded card */
.rk-chapter-downloads__pricing {
  font-family: var(--chapter-body-font);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--chapter-text-muted);
  text-align: center;
  margin-top: 8px;
  line-height: 1.4;
}

.rk-chapter-downloads__pricing strong {
  color: var(--chapter-accent);
  font-weight: 500;
}

@media (max-width: 560px) {
  .rk-chapter-downloads li {
    width: clamp(120px, 28vw, 160px);
  }
  /* On touch-primary devices, always reveal badges (no hover) */
  .rk-chapter-downloads__reveal {
    grid-template-rows: 1fr;
    opacity: 1;
    margin-top: 14px;
  }
}

/* Users with hover-capable devices: keep the hover-to-expand behavior.
   This overrides the always-visible mobile rule on actual desktops. */
@media (hover: hover) and (min-width: 561px) {
  .rk-chapter-downloads__reveal {
    grid-template-rows: 0fr;
    opacity: 0;
    margin-top: 0;
  }
}

.rk-chapter-closer__disclaimer {
  font-family: var(--chapter-body-font);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--chapter-text-muted);
  margin-top: clamp(40px, 5vw, 64px);
  max-width: 560px;
}

.rk-chapter-closer__disclaimer a {
  color: var(--chapter-accent-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── Screenshot gallery strip ── */
.rk-chapter-gallery {
  padding: clamp(80px, 12vh, 140px) 0 clamp(80px, 12vh, 140px);
  background: var(--chapter-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  overflow: hidden;
}

.rk-chapter-gallery__head {
  text-align: center;
  padding: 0 clamp(24px, 6vw, 96px);
  margin-bottom: clamp(48px, 6vw, 96px);
}

.rk-chapter-gallery__track {
  display: flex;
  gap: clamp(16px, 2vw, 32px);
  padding: 0 clamp(24px, 6vw, 96px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--chapter-accent) 40%, transparent) transparent;
}

.rk-chapter-gallery__track::-webkit-scrollbar { height: 6px; }
.rk-chapter-gallery__track::-webkit-scrollbar-track { background: transparent; }
.rk-chapter-gallery__track::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--chapter-accent) 40%, transparent);
  border-radius: 3px;
}

.rk-chapter-gallery__item {
  flex: 0 0 auto;
  width: clamp(240px, 28vw, 360px);
  scroll-snap-align: center;
  border-radius: 42px;
  overflow: hidden;
  filter: drop-shadow(0 30px 60px rgba(4, 8, 12, 0.7));
  transition: transform 0.4s ease;
}

.rk-chapter-gallery__item:hover {
  transform: translateY(-8px);
}

.rk-chapter-gallery__item img {
  display: block;
  width: 100%;
  height: auto;
}

/* ── Mobile ── */
/* ── Tablet: keep 2-col L/R layout, scale type + padding ── */
@media (max-width: 900px) {
  .rk-chapter,
  .rk-chapter.flip {
    min-height: 70svh;
  }

  .rk-chapter__copy,
  .rk-chapter.flip .rk-chapter__copy {
    padding: clamp(32px, 5vh, 60px) clamp(18px, 3vw, 32px);
    max-width: none;
  }

  .rk-chapter-title {
    font-size: clamp(30px, 6.5vw, 64px);
  }

  .rk-chapter-title--hero {
    font-size: clamp(38px, 9vw, 96px);
  }

  .rk-chapter-lead {
    font-size: clamp(14px, 1.8vw, 17px);
  }

  .rk-chapter__media--phone {
    padding: clamp(16px, 3vh, 32px) clamp(10px, 2vw, 20px);
  }

  .rk-chapter__media--phone img {
    max-width: min(95%, 260px);
    max-height: 70svh;
  }

  .rk-chapter-hero {
    padding: clamp(80px, 12vh, 120px) clamp(20px, 6vw, 48px) clamp(40px, 6vh, 60px);
  }

  .rk-chapter-wordmark {
    max-width: 80%;
    max-height: clamp(110px, 18vw, 200px);
  }
}

/* ── Mobile: still 2-col, tighter still ── */
@media (max-width: 560px) {
  .rk-chapter,
  .rk-chapter.flip {
    min-height: 55svh;
  }

  .rk-chapter__copy,
  .rk-chapter.flip .rk-chapter__copy {
    padding: 24px 12px;
  }

  .rk-chapter-title {
    font-size: clamp(22px, 7.5vw, 34px);
    line-height: 1.05;
  }

  .rk-chapter-title--hero {
    font-size: clamp(30px, 11vw, 48px);
  }

  .rk-chapter-lead {
    font-size: 13px;
    line-height: 1.5;
    margin-top: 14px;
  }

  .rk-chapter-kicker {
    font-size: 10px;
    letter-spacing: 0.16em;
    margin-bottom: 10px;
  }

  .rk-chapter-cta {
    font-size: 10px;
    letter-spacing: 0.18em;
    margin-top: 18px;
    gap: 8px;
    padding-bottom: 4px;
  }

  .rk-chapter-cta::after { font-size: 13px; }

  .rk-chapter__media--phone {
    padding: 12px 6px;
  }

  .rk-chapter__media--phone img {
    max-width: 96%;
    border-radius: 18px;
    filter: drop-shadow(0 20px 40px rgba(4, 8, 12, 0.6));
  }

  .rk-chapter-wordmark {
    max-width: 96%;
    max-height: clamp(80px, 22vw, 120px);
    opacity: 0.06;
  }

  /* Edge-fade mask thinner so it doesn't cover half the tiny image */
  .rk-chapter__media::after {
    width: clamp(32px, 10%, 64px);
  }

  .rk-chapter-hero {
    padding: clamp(64px, 10vh, 96px) 16px 32px;
  }

  .rk-chapter-hero__actions .rk-store-badge img { height: 36px; }
  .rk-chapter-closer__badges .rk-store-badge img { height: 40px; }
  .rk-chapter-list li {
    font-size: 14px;
    padding: 5px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rk-chapter-hero__scroll { animation: none; }
  .rk-chapter-gallery__item { transition: none; }
  .rk-chapter-gallery__item:hover { transform: none; }
}