/* ==========================================================
   amamya.com — generative pastel codex
   Palette:
     #f4ecff Lavender Paper   #fff7e6 Buttercream
     #c9b8ff Iris Wash        #a3d9c9 Mint Pistachio
     #ffb5c5 Cherry Blossom   #ffd47a Chamomile Yellow
     #2b2438 Aubergine Ink    #6e6480 Slate Lavender
   Fonts: Big Shoulders Display / Fraunces / DM Mono / Spectral
   ========================================================== */

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

:root {
  --paper: #f4ecff;
  --cream: #fff7e6;
  --iris: #c9b8ff;
  --mint: #a3d9c9;
  --cherry: #ffb5c5;
  --chamomile: #ffd47a;
  --ink: #2b2438;
  --slate: #6e6480;
}

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.7;
  font-variation-settings: "opsz" 14, "SOFT" 30, "WONK" 0;
  -webkit-font-smoothing: antialiased;
}

.sep { color: var(--slate); font-family: "DM Mono", monospace; font-weight: 500; }
.dot { color: var(--cherry); }

.kw {
  font-family: "DM Mono", monospace;
  font-size: 0.92em;
  font-weight: 500;
  color: var(--slate);
}

.hl {
  background: rgba(255, 212, 122, 0.35);
  padding: 0 0.15em;
  border-radius: 2px;
}

em {
  font-style: normal;
  font-weight: 500;
  background: rgba(201, 184, 255, 0.3);
  padding: 0 0.18em;
  border-radius: 2px;
}

/* ========== GRID SCAFFOLD (F-PATTERN) ========== */
.codex {
  display: grid;
  grid-template-columns: 220px 1fr 200px;
  grid-template-areas:
    "masthead masthead masthead"
    "toc reading marginalia"
    "toc foot foot";
  max-width: 1320px;
  margin: 0 auto;
  column-gap: 32px;
  padding: 0 28px;
}

/* ========== MASTHEAD ========== */
.masthead {
  grid-area: masthead;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 22px 4px 18px;
  border-bottom: 1.5px solid var(--mint);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 50;
}
.logotype {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 800;
  font-size: 1.7rem;
  letter-spacing: -0.02em;
}
.version-stamp, .readtime {
  font-family: "DM Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--slate);
}

/* ========== TOC RAIL ========== */
.toc {
  grid-area: toc;
  position: sticky;
  top: 84px;
  align-self: start;
  padding-top: 36px;
  height: max-content;
}
.toc-head {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  font-size: 1.35rem;
  line-height: 0.95;
  color: var(--ink);
  margin-bottom: 18px;
}
.toc-list { list-style: none; }
.toc-list li {
  border-top: 1px solid var(--mint);
  padding: 9px 0;
}
.toc-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--slate);
  font-family: "DM Mono", monospace;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  transition: color 220ms ease;
}
.toc-list a:hover { color: var(--ink); }
.toc-list a.toc-active { color: var(--ink); }
.toc-list a.toc-active .rn {
  background: var(--iris);
  color: var(--ink);
}
.rn {
  font-family: "Spectral", serif;
  font-style: italic;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--cherry);
  min-width: 26px;
  text-align: center;
  border-radius: 3px;
  transition: background 220ms ease, color 220ms ease;
}
.toc-foot {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid var(--mint);
  font-family: "DM Mono", monospace;
  font-size: 0.7rem;
  color: var(--slate);
  line-height: 1.5;
}

/* ========== READING COLUMN ========== */
.reading {
  grid-area: reading;
  padding-top: 24px;
  min-width: 0;
}

/* ===== COVER PLATE ===== */
.cover {
  min-height: 88vh;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px 0 60px;
  border-bottom: 1.5px solid var(--mint);
  margin-bottom: 8px;
  position: relative;
}
.wordmark {
  width: 100%;
  max-width: 980px;
  height: auto;
  display: block;
}
.legend {
  list-style: none;
  display: flex;
  gap: 36px;
  margin-top: 28px;
  flex-wrap: wrap;
  justify-content: center;
}
.legend li {
  font-family: "DM Mono", monospace;
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--slate);
}
.lg-num {
  font-family: "Spectral", serif;
  font-style: italic;
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--cherry);
}
.cover-sub {
  margin-top: 30px;
  font-family: "DM Mono", monospace;
  font-size: 0.82rem;
  color: var(--slate);
  letter-spacing: 0.02em;
}

/* ===== GENERATIVE CANVAS ===== */
.generative-canvas { display: block; }
.card-curve {
  position: absolute;
  inset: -10px auto auto -10px;
  width: 220px;
  height: 160px;
  pointer-events: none;
  opacity: 0.85;
}

/* ===== LESSON CARDS ===== */
.lesson-card {
  position: relative;
  min-height: 65vh;
  margin: 0 0 56px;
  padding: 48px 40px 44px;
  background: var(--paper);
  border: 1.5px solid var(--mint);
  border-radius: 4px;
  overflow: hidden;
  opacity: 0;
  transform: translateX(-100%);
  transition: transform 600ms cubic-bezier(0.22, 1, 0.36, 1),
              opacity 400ms ease-out;
}
.lesson-card[data-index="1"],
.lesson-card[data-index="3"],
.lesson-card[data-index="5"] {
  transform: translateX(100%);
  background: var(--cream);
}
.lesson-card.is-revealed {
  opacity: 1;
  transform: translateX(0);
}

/* alternating accent edge */
.lesson-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--iris);
}
.lesson-card[data-index="1"]::before { background: var(--cherry); }
.lesson-card[data-index="2"]::before { background: var(--mint); }
.lesson-card[data-index="3"]::before { background: var(--chamomile); }
.lesson-card[data-index="4"]::before { background: var(--iris); }
.lesson-card[data-index="5"]::before { background: var(--cherry); }
.lesson-card[data-index="6"]::before { background: var(--mint); }

/* staggered children */
.lesson-card .chapter-mark,
.lesson-card .chapter-title,
.lesson-card .card-icon,
.lesson-card .card-prose,
.lesson-card .card-margin {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease-out, transform 420ms cubic-bezier(0.22, 1, 0.36, 1);
}
.lesson-card.is-revealed .chapter-mark { opacity: 1; transform: none; transition-delay: 80ms; }
.lesson-card.is-revealed .chapter-title { opacity: 1; transform: none; transition-delay: 160ms; }
.lesson-card.is-revealed .card-icon { opacity: 1; transform: none; transition-delay: 240ms; }
.lesson-card.is-revealed .card-prose { opacity: 1; transform: none; transition-delay: 320ms; }
.lesson-card.is-revealed .card-margin { opacity: 1; transform: none; transition-delay: 400ms; }

.chapter-mark {
  font-family: "Spectral", serif;
  font-style: italic;
  font-weight: 500;
  font-size: 2.6rem;
  color: var(--cherry);
  display: block;
  margin-bottom: 6px;
}
.chapter-title {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 800;
  font-size: clamp(4rem, 14vw, 11rem);
  letter-spacing: -0.04em;
  line-height: 0.85;
  color: var(--ink);
  margin-bottom: 32px;
  word-break: break-word;
}

.card-body {
  display: grid;
  grid-template-columns: 96px 1fr;
  column-gap: 36px;
  align-items: start;
}
.card-icon { position: relative; }
.outline-icon {
  width: 96px;
  height: 96px;
  display: block;
  position: relative;
}
.icon-cap {
  margin-top: 12px;
  font-family: "DM Mono", monospace;
  font-size: 0.78rem;
  color: var(--slate);
  line-height: 1.45;
  max-width: 130px;
}
.rn-sup {
  font-family: "DM Mono", monospace;
  color: var(--cherry);
  font-size: 0.78rem;
  font-weight: 500;
}

.card-prose { counter-reset: fn; min-width: 0; }
.card-prose p { margin-bottom: 16px; }
.card-prose p:last-child { margin-bottom: 0; }
.fn-ref::before {
  counter-increment: fn;
  content: counter(fn);
  font-family: "DM Mono", monospace;
  font-size: 0.62em;
  vertical-align: super;
  color: var(--ink);
  background: var(--cherry);
  border-radius: 50%;
  padding: 0.05em 0.32em;
  margin-left: 2px;
}

.card-margin {
  margin-top: 28px;
  counter-reset: fnm;
  border-top: 1px solid var(--mint);
  padding-top: 14px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.field-note {
  font-family: "DM Mono", monospace;
  font-size: 0.78rem;
  font-style: italic;
  color: var(--slate);
  line-height: 1.55;
  padding-left: 4px;
}
.fn-mark::before {
  counter-increment: fnm;
  content: counter(fnm);
  font-style: normal;
  font-size: 0.7em;
  vertical-align: super;
  color: var(--ink);
  border: 1px solid var(--cherry);
  border-radius: 50%;
  padding: 0.05em 0.3em;
  margin-right: 5px;
}
.note-arrow {
  width: 54px;
  height: 22px;
  display: inline-block;
  vertical-align: middle;
  margin-right: 4px;
  opacity: 0;
  transition: opacity 600ms ease;
}
.lesson-card.is-revealed .note-arrow { opacity: 1; }
.note-arrow path {
  stroke-dasharray: 120;
  stroke-dashoffset: 120;
  transition: stroke-dashoffset 1200ms ease 400ms;
}
.lesson-card.is-revealed .note-arrow path { stroke-dashoffset: 0; }

/* ===== READING COLUMN TAPER (sequential, no JS) ===== */
#ch1 .card-prose { max-width: 720px; }
#ch2 .card-prose { max-width: 680px; }
#ch3 .card-prose { max-width: 620px; }
#ch4 .card-prose { max-width: 560px; }
#ch5 .card-prose { max-width: 560px; }
#ch6 .card-prose { max-width: 560px; }
#ch7 .card-prose { max-width: 560px; }

/* on wider middle column, faint underlay behind prose */
.card-prose::before {
  content: "";
  position: absolute;
}

/* ===== SPECIMEN DRAWER ===== */
.specimen-drawer {
  margin: 16px 0 48px;
  padding: 36px 0 12px;
  border-top: 1.5px solid var(--mint);
}
.drawer-head {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 18px;
}
.drawer-scroll {
  overflow-x: auto;
  padding-bottom: 12px;
}
.drawer-grid {
  display: grid;
  grid-template-columns: repeat(6, 150px);
  grid-auto-rows: 150px;
  border-top: 1px solid var(--mint);
  border-left: 1px solid var(--mint);
  width: max-content;
}
.spec {
  border-right: 1px solid var(--mint);
  border-bottom: 1px solid var(--mint);
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--paper);
}
.spec:nth-child(even) { background: var(--cream); }
.spec svg { width: 64px; height: 64px; display: block; }
.spec figcaption {
  font-family: "DM Mono", monospace;
  font-size: 0.66rem;
  color: var(--slate);
  text-align: center;
  line-height: 1.35;
}

/* ========== MARGINALIA RAIL ========== */
.marginalia {
  grid-area: marginalia;
  padding-top: 36px;
  align-self: start;
  position: sticky;
  top: 84px;
  height: max-content;
}
.marg-head {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 0.95;
  color: var(--ink);
  margin-bottom: 18px;
}
.marg-note {
  font-family: "DM Mono", monospace;
  font-size: 0.72rem;
  color: var(--slate);
  line-height: 1.6;
  padding: 10px 0;
  border-top: 1px solid var(--mint);
}

/* ========== FOOTER ========== */
.codex-foot {
  grid-area: foot;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 24px 4px 36px;
  margin-top: 16px;
  border-top: 1.5px solid var(--mint);
  font-family: "DM Mono", monospace;
  font-size: 0.78rem;
  color: var(--slate);
}
.codex-foot > span:first-child {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--ink);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1080px) {
  .codex {
    grid-template-columns: 180px 1fr;
    grid-template-areas:
      "masthead masthead"
      "toc reading"
      "marginalia reading"
      "foot foot";
  }
  .marginalia { position: static; padding-top: 20px; }
}
@media (max-width: 760px) {
  body { font-size: 1.05rem; }
  .codex {
    grid-template-columns: 1fr;
    grid-template-areas:
      "masthead"
      "toc"
      "reading"
      "marginalia"
      "foot";
    padding: 0 18px;
  }
  .toc, .marginalia { position: static; top: auto; }
  .card-body { grid-template-columns: 1fr; row-gap: 20px; }
  .lesson-card { padding: 32px 22px; }
  .chapter-title { font-size: clamp(3rem, 18vw, 6rem); }
  .drawer-grid { grid-template-columns: repeat(6, 120px); grid-auto-rows: 120px; }
}