/* ============================================================
   Learning Machines — homepage layout (Field Manual language)
   ============================================================ */

/* ---------------- hero ---------------- */
.hero { padding-block: clamp(48px, 7vw, 88px) clamp(40px, 5vw, 64px); }
.hero.poster-wash::before {
  opacity: 0.30;
}
.hero.poster-register::after {
  opacity: 0.18;
}
.hero h1 {
  font-size: clamp(44px, 7vw, 88px);
  max-width: 14ch;
}
.hero h1 em {
  font-style: italic;
  font-weight: 400;
}
html[data-type="signage"] .hero h1 em { font-style: normal; font-weight: 700; color: var(--m-text); }
.hero-lede {
  max-width: 56ch;
  font-size: clamp(16px, 1.6vw, 18.5px);
  line-height: 1.6;
  color: var(--ink-soft);
  margin-top: 26px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 32px;
}
.hero-principle {
  margin-top: 30px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.hero-principle b { color: var(--ink); font-weight: 500; }
.hero-dates {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
}
.hero-dates b { color: var(--ink); font-weight: 600; }
.hero-dates a { color: var(--accent); text-decoration: none; }
.hero-dates a:hover { text-decoration: underline; text-underline-offset: 3px; }
.hero-machine-panel {
  margin-top: 22px;
  max-width: 680px;
}
.hero-machine-panel .sw-token { --sw-delay: 0s; }
.hero-machine-panel .sw-token:nth-child(2) { --sw-delay: 0.16s; }
.hero-machine-panel .sw-token:nth-child(3) { --sw-delay: 0.32s; }
.hero-machine-panel .sw-token:nth-child(4) { --sw-delay: 0.48s; }
.hero-machine-panel .sw-line {
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* ---------------- spine plates ---------------- */
.spine {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: clamp(36px, 5vw, 56px);
}
.plate-claim {
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.15;
  letter-spacing: var(--display-tracking);
}
.plate-claim em { font-style: italic; }
html[data-type="signage"] .plate-claim { font-weight: 600; }
.plate-art {
  height: 96px;
  display: flex;
  align-items: center;
}
.spine .plate {
  position: relative;
  overflow: hidden;
}
.spine .plate > * {
  position: relative;
  z-index: 1;
}
.spine .plate::before {
  content: "";
  position: absolute;
  inset: -36%;
  opacity: 0.18;
  pointer-events: none;
  mix-blend-mode: var(--poster-blend);
  background:
    radial-gradient(circle at 20% 28%, var(--poster-hot-pink) 0 8%, transparent 22%),
    radial-gradient(circle at 80% 22%, var(--poster-lime) 0 10%, transparent 28%),
    linear-gradient(115deg, var(--poster-coral), transparent 30%, var(--poster-cyan) 58%, transparent 72%, var(--poster-violet));
}
.spine .plate::after {
  content: "";
  position: absolute;
  inset: -16%;
  opacity: 0.16;
  pointer-events: none;
  mix-blend-mode: var(--poster-blend);
  background:
    radial-gradient(76px 18px at 16% 64%, transparent 40%, var(--poster-hot-pink) 42% 50%, transparent 52%),
    radial-gradient(84px 18px at 78% 34%, transparent 40%, var(--poster-lime) 42% 50%, transparent 52%);
  transform: rotate(-4deg);
}
@media (prefers-reduced-motion: no-preference) {
  .spine .plate::before { animation: plate-color-drift 15s ease-in-out infinite alternate; }
  .spine .plate::after { animation: plate-register-drift 13s ease-in-out infinite alternate; }
  .spine .plate:nth-child(2)::before,
  .spine .plate:nth-child(2)::after { animation-delay: -3s; }
  .spine .plate:nth-child(3)::before,
  .spine .plate:nth-child(3)::after { animation-delay: -6s; }
  @keyframes plate-color-drift {
    0% { transform: translate3d(-2%, -1%, 0) rotate(-1deg); }
    100% { transform: translate3d(2%, 1%, 0) rotate(1deg); }
  }
  @keyframes plate-register-drift {
    0% { transform: translate3d(-3px, 1px, 0) rotate(-4deg); }
    100% { transform: translate3d(4px, -2px, 0) rotate(-1deg); }
  }
}
@media (prefers-reduced-motion: reduce) {
  .spine .plate::before,
  .spine .plate::after {
    animation: none !important;
  }
}

/* plate 1 — sequential: token squares appearing left to right */
.seq-row { display: flex; align-items: center; gap: 6px; width: 100%; }
.seq-row .tk {
  height: 22px;
  flex: 1;
  background: var(--m-text);
  opacity: 0.9;
}
.seq-row .tk.ghost {
  background: transparent;
  border: 1px dashed var(--m-text);
  opacity: 0.7;
}
@media (prefers-reduced-motion: no-preference) {
  .seq-row .tk { animation: tk-in 5.6s ease-in-out infinite; opacity: 0; }
  .seq-row .tk:nth-child(1) { animation-delay: 0.0s; }
  .seq-row .tk:nth-child(2) { animation-delay: 0.45s; }
  .seq-row .tk:nth-child(3) { animation-delay: 0.9s; }
  .seq-row .tk:nth-child(4) { animation-delay: 1.35s; }
  .seq-row .tk:nth-child(5) { animation-delay: 1.8s; }
  .seq-row .tk:nth-child(6) { animation-delay: 2.25s; }
  .seq-row .tk.ghost { animation-name: tk-ghost; animation-delay: 2.7s; }
  @keyframes tk-in {
    0% { opacity: 0; }
    6%, 78% { opacity: 0.9; }
    92%, 100% { opacity: 0; }
  }
  @keyframes tk-ghost {
    0% { opacity: 0; }
    6%, 50% { opacity: 0.7; }
    64%, 100% { opacity: 0; }
  }
}

/* plate 2 — spatial: grid of cells resolving */
.px-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
  width: 100%;
  /* cap cell size so two rows always fit the fixed 96px plate-art */
  max-width: 360px;
}
.px-grid i {
  display: block;
  aspect-ratio: 1;
  background: var(--m-image);
}
.px-grid i:nth-child(3n)  { opacity: 0.25; }
.px-grid i:nth-child(3n+1){ opacity: 0.55; }
.px-grid i:nth-child(3n+2){ opacity: 0.85; }
.px-grid i:nth-child(5n)  { opacity: 0.12; }
.px-grid i:nth-child(7n)  { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
  .px-grid i { animation: px-breathe 5.6s ease-in-out infinite; }
  .px-grid i:nth-child(2n) { animation-delay: 1.2s; }
  .px-grid i:nth-child(3n) { animation-delay: 2.3s; }
  .px-grid i:nth-child(5n) { animation-delay: 3.1s; }
  @keyframes px-breathe {
    0%, 100% { filter: none; }
    50% { filter: opacity(0.45); }
  }
}

/* plate 3 — spatiotemporal: offset frames, subject drifting */
.frames { position: relative; width: 100%; height: 96px; }
.frames .fr {
  position: absolute;
  width: 64%;
  height: 72px;
  border: 1px solid var(--m-video);
  background: var(--surface);
}
.frames .fr:nth-child(1) { left: 0;   top: 18px; opacity: 0.35; }
.frames .fr:nth-child(2) { left: 16%; top: 10px; opacity: 0.6; }
.frames .fr:nth-child(3) { left: 32%; top: 2px;  opacity: 1; }
.frames .fr i {
  position: absolute;
  width: 14px; height: 14px;
  background: var(--m-video);
}
.frames .fr:nth-child(1) i { left: 18%; bottom: 12px; }
.frames .fr:nth-child(2) i { left: 38%; bottom: 20px; transform: rotate(8deg); }
.frames .fr:nth-child(3) i { left: 60%; bottom: 14px; transform: rotate(21deg) scale(1.25); }

/* ---------------- ledger strip ---------------- */
.ledger {
  border-block: 1px solid var(--ink);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.ledger .cell {
  padding: 18px 20px;
  border-left: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.ledger .cell:first-child { border-left: 0; padding-left: 2px; }
.ledger .num {
  font-family: var(--font-display);
  font-size: 32px;
  line-height: 1;
  font-weight: var(--display-weight);
}
.ledger .lbl {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------------- start here ---------------- */
.start-here {
  background:
    linear-gradient(90deg, color-mix(in oklab, var(--m-text) 7%, transparent), transparent 45%, color-mix(in oklab, var(--m-video) 7%, transparent)),
    var(--bg);
}
.start-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.start-card {
  --start-ink: var(--m-cross);
  --start-tint: var(--m-cross-tint);
  display: grid;
  gap: 12px;
  align-content: start;
  min-height: 220px;
  border: 1px solid var(--ink);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  padding: 20px;
  position: relative;
  overflow: hidden;
}
.start-card[data-mod="text"] { --start-ink: var(--m-text); --start-tint: var(--m-text-tint); }
.start-card[data-mod="video"] { --start-ink: var(--m-video); --start-tint: var(--m-video-tint); }
.start-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 7px;
  background: var(--start-ink);
}
.start-card::after {
  content: "";
  position: absolute;
  right: -36px;
  top: 48px;
  width: 150px;
  height: 34px;
  border: 1px solid var(--start-ink);
  background: var(--start-tint);
  transform: rotate(-4deg);
  opacity: 0.45;
  pointer-events: none;
}
.start-card:hover {
  background: color-mix(in oklab, var(--start-ink) 8%, var(--surface));
}
.start-k {
  color: var(--start-ink);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.start-card h3 {
  font-size: clamp(23px, 2.8vw, 34px);
  max-width: 10ch;
  position: relative;
  z-index: 1;
}
.start-card p {
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.55;
  max-width: 34ch;
  position: relative;
  z-index: 1;
}
.start-go {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}
.start-card:hover .start-go {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------------- sessions ---------------- */
.arc-head { max-width: 60ch; margin-bottom: clamp(28px, 4vw, 40px); }
.arc-head h2 { font-size: clamp(30px, 4vw, 46px); }
.arc-head .protocol {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.sessions { border-top: 1px solid var(--ink); }
.home-session-signal {
  margin: 0 0 clamp(22px, 4vw, 34px);
}
.home-session-signal .risk-token-wall,
.home-tools-signal .risk-token-wall {
  justify-content: flex-end;
}
.session-row {
  display: grid;
  grid-template-columns: 72px 200px 1fr auto;
  align-items: baseline;
  gap: 20px;
  padding: 22px 2px;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.session-row::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: -1px;
  width: 0;
  background: var(--mtint, transparent);
  transition: width 200ms ease;
  z-index: -1;
}
.session-row:hover::before { width: 100%; }
.session-row::after {
  content: "";
  position: absolute;
  right: 12%;
  top: 50%;
  width: 150px;
  height: 28px;
  border: 1px solid var(--mink);
  opacity: 0.12;
  transform: translateY(-50%) rotate(-3deg);
  pointer-events: none;
}
.session-row[data-mod="text"]  { --mink: var(--m-text);  --mtint: var(--m-text-tint); }
.session-row[data-mod="image"] { --mink: var(--m-image); --mtint: var(--m-image-tint); }
.session-row[data-mod="video"] { --mink: var(--m-video); --mtint: var(--m-video-tint); }
.session-row[data-mod="cross"] { --mink: var(--m-cross); --mtint: var(--m-cross-tint); }
.session-row[data-skin-row="text-terminal"] {
  --skin-row-a: #69ff99;
  --skin-row-b: #06120d;
}
.session-row[data-skin-row="image-spectrum"] {
  --skin-row-a: #21baf2;
  --skin-row-b: #ffb1d6;
}
.session-row[data-skin-row="video-slitscan"] {
  --skin-row-a: #23a5d2;
  --skin-row-b: #b33b86;
}
.session-row[data-skin-row="studio-synthesis"] {
  --skin-row-a: var(--poster-hot-pink);
  --skin-row-b: var(--poster-lime);
}
.session-row .s-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.session-row .s-no .modsq { background: var(--mink); }
.session-row h3 {
  font-size: clamp(24px, 3vw, 34px);
}
.session-row .s-meta { min-width: 0; }
.session-row .s-kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.session-row .s-blurb {
  color: var(--ink-soft);
  font-size: 14.5px;
  max-width: 52ch;
}
.session-row .s-go {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.session-row:hover .s-go { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
html[data-skin="home-sampler"] .session-row::after {
  border-color: var(--skin-row-a, var(--mink));
  opacity: 0.22;
  box-shadow: 10px 8px 0 color-mix(in oklab, var(--skin-row-b, var(--mink)) 24%, transparent);
}
html[data-skin="home-sampler"] .session-row[data-skin-row="text-terminal"]::after {
  background:
    repeating-linear-gradient(0deg, rgba(105, 255, 153, 0.18) 0 1px, transparent 1px 5px),
    #06120d;
}
html[data-skin="home-sampler"] .session-row[data-skin-row="image-spectrum"]::after {
  background:
    linear-gradient(112deg, #69d08f, #b9d7ff 30%, #ffb1d6 62%, #d7c4ff);
}
html[data-skin="home-sampler"] .session-row[data-skin-row="video-slitscan"]::after {
  background:
    linear-gradient(90deg, transparent 0 12%, var(--skin-row-a) 12% 17%, transparent 17% 34%, var(--skin-row-b) 34% 39%, transparent 39%),
    #11151b;
}
html[data-skin="home-sampler"] .session-row[data-skin-row="studio-synthesis"]::after {
  background:
    linear-gradient(90deg, var(--skin-row-a), transparent 32%, var(--skin-row-b)),
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(0, 0, 0, 0.18) 18px 19px);
}

/* ---------------- tool index ---------------- */
.browser-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}
.home-tools-signal {
  margin: 0 0 20px;
}
.home-tools-signal .risk-grid {
  max-width: 320px;
  margin-left: auto;
}
.browser-head h2 { font-size: clamp(30px, 4vw, 46px); }
.browser-head p { color: var(--ink-soft); max-width: 52ch; margin-top: 12px; font-size: 15px; }
.count { font-size: 12px; color: var(--muted); white-space: nowrap; }

.browser-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 14px;
}
.filters { display: flex; flex-wrap: wrap; gap: 4px; }
.filter-btn {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: none;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 7px 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.filter-btn:hover { color: var(--ink); }
.filter-btn.on { border-color: var(--ink); color: var(--ink); background: var(--surface); }

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--ink);
  padding: 6px 2px;
  min-width: 220px;
}
.search-box svg { width: 14px; height: 14px; stroke: var(--muted); }
.search-box input {
  border: 0;
  background: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  width: 100%;
}
.search-box input::placeholder { color: var(--muted); }

.tool-index { border-top: 1px solid var(--ink); }


/* ---------------- method ---------------- */
.method-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
.method-grid h2 { font-size: clamp(30px, 4vw, 46px); }
.method-lede { margin-top: 16px; color: var(--ink-soft); font-size: 15.5px; max-width: 44ch; }
.naming-rule {
  margin-top: 28px;
  border: 1px solid var(--ink);
  background: var(--surface);
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}
.naming-rule b { color: var(--ink); font-weight: 600; }
.msteps { border-top: 1px solid var(--ink); counter-reset: move; }
.mstep {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  padding: 18px 2px;
  border-bottom: 1px solid var(--rule);
}
.mstep .mnum {
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1;
  font-weight: var(--display-weight);
  color: var(--muted);
}
.mstep h4 { font-size: 15px; margin-bottom: 4px; }
.mstep p { font-size: 13.5px; color: var(--ink-soft); }
.mstep.loopback .mnum { color: var(--ink); }
.mstep.loopback { border-bottom: 1px solid var(--ink); }

/* ---------------- pathways ---------------- */
.path-note {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.3;
  max-width: 34ch;
  margin-top: 14px;
}
.path-note em { font-style: italic; }
.pathways {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--ink);
  background: var(--surface);
  margin-top: clamp(28px, 4vw, 40px);
}
.path {
  padding: 20px 18px 24px;
  border-left: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.path:first-child { border-left: 0; }
.path .pnum {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.path h4 { font-size: 15px; }
.path p { font-size: 13px; color: var(--ink-soft); }

/* ---------------- materials ---------------- */
.doc-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 56px);
}
.doc-group h3 {
  font-size: 21px;
  margin-bottom: 14px;
}

/* ---------------- credits / colophon ---------------- */
.credits {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--rule);
  padding-top: 24px;
}
.credit .c-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.credit p { font-size: 13.5px; color: var(--ink-soft); }
.credit a { color: var(--ink); text-underline-offset: 3px; }

/* ---------------- responsive ---------------- */
@media (max-width: 960px) {
  .ix-row { grid-template-columns: 40px minmax(0, 1fr) 130px; }
  .ix-blurb { display: none; }
  .ix-stamp-cell { display: none; }
  .session-row { grid-template-columns: 56px 1fr; row-gap: 6px; }
  .session-row .s-meta { grid-column: 1 / -1; }
  .session-row .s-go { display: none; }
  .method-grid { grid-template-columns: 1fr; }
  .pathways { grid-template-columns: 1fr; }
  .path { border-left: 0; border-top: 1px solid var(--rule); }
  .path:first-child { border-top: 0; }
  .start-grid { grid-template-columns: 1fr; }
  .start-card { min-height: 0; }
  .credits { grid-template-columns: 1fr; }
  .doc-cols { grid-template-columns: 1fr; }
  .home-session-signal .risk-token-wall,
  .home-tools-signal .risk-token-wall {
    justify-content: flex-start;
  }
  .home-tools-signal .risk-grid {
    margin-left: 0;
  }
}
@media (max-width: 700px) {
  .spine { grid-template-columns: 1fr; }
  .ledger { grid-template-columns: 1fr 1fr; }
  .ledger .cell:nth-child(3) { border-left: 0; padding-left: 2px; }
  .ledger .cell { border-top: 1px solid var(--rule); }
  .ledger .cell:nth-child(-n+2) { border-top: 0; }
  .browser-head { flex-direction: column; align-items: flex-start; }
}

/* Repeat registration CTA — catches a convinced scroller before the
   Materials library. Mirrors the hero ask lower on the page. */
.register-band {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.register-band .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
}
.register-band .rb-copy { flex: 1 1 320px; }
.register-band h2 { margin: 0 0 6px; }
.register-band p { margin: 0; color: var(--ink-soft); }
.register-band p b { color: var(--ink); font-weight: 600; }
.register-band .rb-actions { display: flex; flex-wrap: wrap; gap: 12px; }