/* ══════════════════════════════════════════════════════════════════
   Multimodal Flow — project page
   Palette follows the paper figures:
     blue   = text / discrete      green = vision / continuous
     purple = the shared flow backbone
   ══════════════════════════════════════════════════════════════════ */

:root {
  --ink:        #171a1d;
  --ink-2:      #3c444d;
  --muted:      #6b747e;
  --faint:      #9aa3ad;
  --line:       #e3e6ea;
  --line-soft:  #eef0f3;
  --bg:         #fdfdfc;
  --bg-soft:    #f6f7f9;

  --blue:       #3f72b0;
  --blue-deep:  #24497a;
  --blue-soft:  #dde8f5;
  --blue-line:  #a8c4e4;

  --green:      #5d9b4b;
  --green-deep: #3d6b30;
  --green-soft: #ddefd4;
  --green-line: #a9d396;

  --purple:     #7a6ba6;
  --purple-soft:#e7e2f3;
  --purple-line:#bdb2da;

  --grey-soft:  #e9ebef;

  --serif: "Source Serif 4", "Iowan Old Style", "Charter", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --radius: 10px;
  --shadow-s: 0 1px 2px rgba(16,24,40,.05), 0 1px 3px rgba(16,24,40,.06);
  --shadow-m: 0 2px 6px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.07);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--blue-deep); text-decoration: none; border-bottom: 1px solid rgba(63,114,176,.3); transition: border-color .15s, color .15s; }
a:hover { color: var(--blue); border-bottom-color: var(--blue); }

/* inline math-ish spans */
.m {
  font-family: var(--serif);
  font-style: italic;
  font-feature-settings: "ss01";
  white-space: nowrap;
  letter-spacing: .01em;
}
.m sub, .m sup { font-style: normal; font-size: .68em; }

/* ─────────────────────────── HERO ─────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(165deg, #10151e 0%, #1a2233 42%, #232a3f 72%, #2b2f48 100%);
  color: #fff;
  padding: 92px 32px 78px;
  text-align: center;
  isolation: isolate;
}
#flowfield {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: -1; opacity: .55;
}
.hero-fade {
  position: absolute; left: 0; right: 0; bottom: 0; height: 110px;
  background: linear-gradient(to bottom, rgba(16,21,30,0), rgba(253,253,252,.08));
  pointer-events: none;
}
.hero-inner { max-width: 860px; margin: 0 auto; position: relative; }

.eyebrow {
  font-family: var(--sans);
  font-size: 12.5px; font-weight: 600;
  letter-spacing: .16em; text-transform: uppercase;
  color: #a7c4e8; margin: 0 0 20px;
}
.hero h1 {
  font-size: clamp(3rem, 8vw, 4.9rem);
  line-height: 1.02; font-weight: 600;
  margin: 0 0 .22em; letter-spacing: -.025em;
  background: linear-gradient(100deg, #ffffff 20%, #cfe0f6 55%, #c6e6b8 95%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: clamp(1.02rem, 2.3vw, 1.32rem);
  color: #c9d4e4; margin: 0 auto 26px; max-width: 42ch;
  font-weight: 400; line-height: 1.45;
}
.hero-tag {
  font-size: 1.02rem; color: #9fb0c6; margin: 0 auto 34px;
  max-width: 54ch; line-height: 1.6;
}
.hero-tag em { color: #d6e5f7; font-style: italic; }

.btn-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  font-family: var(--sans); font-size: 14.5px; font-weight: 550;
  padding: 11px 24px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,.26);
  background: rgba(255,255,255,.07);
  color: #e8eefa; text-decoration: none;
  backdrop-filter: blur(6px);
  transition: background .18s, border-color .18s, transform .18s;
}
.btn:hover { background: rgba(255,255,255,.17); border-color: rgba(255,255,255,.5); color: #fff; transform: translateY(-1px); }
.btn-primary { background: #e9eef7; color: #16233a; border-color: #e9eef7; }
.btn-primary:hover { background: #fff; color: #0f1726; }

/* ─────────────────────────── BYLINE ─────────────────────────── */
.byline {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  padding: 30px 32px 26px;
}
.byline-grid {
  max-width: 1060px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(5, auto);
  justify-content: space-between; gap: 20px 34px;
}
.byline-grid h4 {
  font-family: var(--sans); font-size: 11.5px; font-weight: 650;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-2); margin: 0 0 10px;
}
.byline-grid p {
  font-family: var(--sans); font-size: 13.5px; line-height: 1.5;
  color: var(--muted); margin: 3px 0;
}
.byline-grid a { color: var(--muted); border-bottom: none; }
.byline-grid a:hover { color: var(--blue); text-decoration: underline; }
.byline-grid sup { font-size: .72em; color: var(--faint); }

/* ─────────────────────────── LAYOUT ─────────────────────────── */
.page {
  max-width: 1160px; margin: 0 auto;
  padding: 54px 32px 40px;
  display: grid; grid-template-columns: 196px minmax(0, 1fr);
  gap: 60px; align-items: start;
}

.toc { position: sticky; top: 30px; }
.toc h4 {
  font-family: var(--sans); font-size: 11.5px; font-weight: 650;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-2); margin: 0 0 12px;
  padding-bottom: 10px; border-bottom: 1px solid var(--line);
}
.toc nav { display: flex; flex-direction: column; gap: 1px; }
.toc nav a {
  font-family: var(--sans); font-size: 13px; line-height: 1.38;
  color: var(--muted); border-bottom: none;
  padding: 6px 10px 6px 11px;
  border-left: 2px solid transparent;
  border-radius: 0 5px 5px 0;
  transition: color .15s, border-color .15s, background .15s;
}
.toc nav a:hover { color: var(--ink); background: var(--bg-soft); }
.toc nav a.is-active { color: var(--blue-deep); border-left-color: var(--blue); font-weight: 550; background: var(--blue-soft); }

.article { max-width: 760px; min-width: 0; }

/* wide tables scroll horizontally on narrow screens instead of
   stretching the grid column */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
.table-scroll > table { margin-top: 1.5em; margin-bottom: .8em; }

/* ─────────────────────────── TYPE ─────────────────────────── */
.article h2 {
  font-size: 1.82rem; font-weight: 600; letter-spacing: -.016em;
  line-height: 1.22; margin: 0 0 .7em;
  padding-top: 18px; border-top: 1px solid var(--line);
  display: flex; align-items: baseline; gap: 14px;
}
.article h2 .num {
  font-family: var(--sans); font-size: .62em; font-weight: 650;
  color: #fff; background: var(--purple);
  width: 1.75em; height: 1.75em; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 6px; transform: translateY(-.1em);
  letter-spacing: 0;
}
.article h3 {
  font-size: 1.2rem; font-weight: 600; letter-spacing: -.008em;
  margin: 2.3em 0 .6em; color: var(--ink);
}
.article h5 {
  font-family: var(--sans); font-size: 13px; font-weight: 650;
  letter-spacing: .04em; margin: 0; color: var(--ink);
}
.article p { margin: 0 0 1.15em; }
.article section { margin-bottom: 68px; }
.article strong { font-weight: 600; color: var(--ink); }
.article em { font-style: italic; }

.lede {
  font-size: 1.1rem; line-height: 1.62; color: var(--ink-2);
  border-left: 3px solid var(--purple-line);
  padding: 2px 0 2px 20px; margin-top: 1.6em !important;
}

/* TL;DR */
.tldr {
  background: linear-gradient(180deg, #f7f9fc, #f2f5fa);
  border: 1px solid #dde4ee;
  border-radius: var(--radius);
  padding: 22px 26px; margin: 0 0 54px;
}
.tldr p { margin: 0; font-size: 1.015rem; line-height: 1.6; color: var(--ink-2); }
.tldr-tag {
  display: inline-block; font-family: var(--sans);
  font-size: 10.5px; font-weight: 700; letter-spacing: .1em;
  color: #fff; background: var(--blue-deep);
  padding: 3px 8px; border-radius: 4px;
  margin-right: 10px; transform: translateY(-2px);
}

/* callout */
.callout {
  background: #fdf8ef; border: 1px solid #efdfc4;
  border-left: 3px solid #d8a94e;
  border-radius: 8px; padding: 18px 24px; margin: 0 0 2em;
}
.callout p { margin: 0; font-size: .98rem; line-height: 1.6; color: #5a4a2e; }
.callout strong { color: #43361e; }
.callout em { color: #43361e; }

/* ─────────────────────────── FIGURES ─────────────────────────── */
.fig { margin: 2.1em 0 2.3em; }
.fig img {
  width: 100%; height: auto; display: block;
  border: 1px solid var(--line); border-radius: 8px;
  background: #fff;
}
.fig figcaption {
  font-family: var(--sans); font-size: 13.2px; line-height: 1.58;
  color: var(--muted); margin-top: 12px;
}
.fig figcaption strong { color: var(--ink-2); font-weight: 600; }
.fig-wide { width: 114%; margin-left: -7%; }

.two-col {
  display: grid; grid-template-columns: 1fr 1fr; gap: 26px;
  margin: 1.6em 0; width: 114%; margin-left: -7%;
}
.two-col .fig { margin: 0; }
.two-col .fig img { background: #fff; }

/* ─────────────────────────── EQUATIONS ─────────────────────────── */
.eq {
  background: var(--bg-soft); border: 1px solid var(--line-soft);
  border-radius: 8px; padding: 18px 22px; margin: 1.5em 0;
  text-align: center; font-size: 1.1rem; color: var(--ink);
  overflow-x: auto;
}
.eq-big { font-size: 1.24rem; padding: 24px; }
.eq-where {
  display: block; font-family: var(--sans); font-style: normal;
  font-size: 12.5px; color: var(--muted); margin-top: 12px;
}
.eq-row { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; font-size: 1.04rem; }
.eq-sep { color: var(--faint); font-size: 1.3em; }

/* ─────────────────────────── TABLES ─────────────────────────── */
.data-table {
  width: 100%; border-collapse: collapse;
  font-family: var(--sans); font-size: 13.5px;
  margin: 1.5em 0 .8em;
}
.data-table th, .data-table td { padding: 9px 10px; text-align: center; }
.data-table th:first-child, .data-table td:first-child,
.data-table th:nth-child(2), .data-table td:nth-child(2) { text-align: left; }
.data-table thead th {
  font-weight: 650; color: var(--ink-2); font-size: 12.5px;
  border-top: 1.5px solid var(--ink-2); border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.data-table tbody td { border-bottom: 1px solid var(--line-soft); color: var(--ink-2); }
.data-table tbody tr:last-child td { border-bottom: 1.5px solid var(--ink-2); }
.data-table .best { font-weight: 650; color: var(--ink); }
.data-table .is-ours-row td { background: var(--purple-soft); }
.data-table .is-ours-row td:first-child { font-weight: 650; color: var(--purple); }
.tbl-cap {
  font-family: var(--sans); font-size: 13px; line-height: 1.58;
  color: var(--muted); margin: 0 0 1em;
}

/* property table (paradigms) */
.prop-table {
  width: 100%; border-collapse: collapse;
  font-family: var(--sans); font-size: 13.5px; margin: 14px 0 10px;
}
.prop-table th, .prop-table td { padding: 11px 12px; }
.prop-table thead th {
  font-size: 12.5px; font-weight: 650; text-align: center; color: var(--ink-2);
  border-bottom: 1px solid var(--line);
  transition: opacity .2s, background .2s;
}
.prop-table thead th:first-child { text-align: left; }
.prop-table tbody th {
  text-align: left; font-weight: 550; color: var(--ink-2);
  border-bottom: 1px solid var(--line-soft);
}
.prop-table tbody td {
  text-align: center; font-size: 17px; font-weight: 700;
  border-bottom: 1px solid var(--line-soft);
  transition: opacity .2s, background .2s;
}
.prop-table .yes { color: #4f9b3c; }
.prop-table .no  { color: #c45a4e; }
.prop-why {
  display: block; font-size: 11.5px; font-weight: 400;
  color: var(--faint); margin-top: 1px;
}
.prop-table.is-filtered [data-col]:not(.col-on) { opacity: .22; }
.prop-table [data-col].col-on { background: rgba(122,107,166,.08); }

/* ─────────────────────────── PARADIGM CARDS ─────────────────────────── */
.paradigms { margin: 1.9em 0 1.4em; }
.para-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.para-card {
  display: flex; flex-direction: column; gap: 6px; text-align: left;
  background: #fff; border: 1px solid var(--line);
  border-radius: 10px; padding: 15px 16px 14px;
  cursor: pointer; font-family: var(--sans);
  transition: border-color .18s, box-shadow .18s, transform .18s;
}
.para-card:hover { border-color: var(--blue-line); box-shadow: var(--shadow-s); transform: translateY(-1px); }
.para-card.is-sel { border-color: var(--purple); box-shadow: 0 0 0 3px var(--purple-soft); }
.pc-label { font-size: 11px; font-weight: 700; color: var(--faint); letter-spacing: .06em; }
.pc-title { font-size: 14.5px; font-weight: 650; color: var(--ink); line-height: 1.25; }
.pc-sub { font-size: 11.5px; color: var(--faint); font-style: italic; }
.pc-strip { display: flex; gap: 3px; margin: 7px 0 3px; }
.pc-note { font-size: 11.5px; color: var(--muted); }
.para-card.is-ours .pc-title { color: var(--green-deep); }

.sq { width: 15px; height: 11px; border-radius: 2.5px; display: inline-block; }
.sq.sm { width: 11px; height: 9px; }
.sq.blue  { background: var(--blue-soft);  border: 1px solid var(--blue-line); }
.sq.green { background: var(--green-soft); border: 1px solid var(--green-line); }

.para-caption {
  font-family: var(--sans); font-size: 13px; line-height: 1.58;
  color: var(--muted); margin: 6px 0 0;
}

/* ─────────────────────────── DEMO SHELL ─────────────────────────── */
.demo {
  border: 1px solid var(--line); border-radius: 12px;
  background: #fff; box-shadow: var(--shadow-s);
  margin: 1.9em 0 1.6em; overflow: hidden;
}
.demo-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 13px 18px;
  background: var(--bg-soft); border-bottom: 1px solid var(--line);
}
.demo-hint {
  font-family: var(--sans); font-size: 11.5px; color: var(--faint);
  letter-spacing: .04em; text-transform: uppercase;
}
.demo-body { padding: 22px; }
.demo-foot {
  font-family: var(--sans); font-size: 12.3px; line-height: 1.55;
  color: var(--faint); margin: 0; padding: 0 22px 18px;
}

.seg { display: flex; gap: 2px; background: #e8eaee; padding: 3px; border-radius: 8px; }
.seg-btn {
  font-family: var(--sans); font-size: 12.5px; font-weight: 550;
  padding: 5px 13px; border: none; border-radius: 6px;
  background: transparent; color: var(--muted); cursor: pointer;
  transition: background .16s, color .16s;
}
.seg-btn:hover { color: var(--ink); }
.seg-btn.is-on { background: #fff; color: var(--ink); box-shadow: var(--shadow-s); }

/* ───────── chunk-construction demo ───────── */
.chunk-pane { display: none; }
.chunk-pane.is-on { display: block; animation: fade .3s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.pipe { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.pipe-step { width: 100%; text-align: center; }
.pipe-tag {
  display: block; font-family: var(--sans); font-size: 10.5px;
  font-weight: 650; letter-spacing: .1em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 9px;
}
.pipe-arrow {
  font-family: var(--sans); font-size: 12px; color: var(--faint);
  margin: 12px 0; display: flex; align-items: center; gap: 8px;
}
.pipe-arrow span { font-size: 11.5px; }

.raw-text {
  font-family: var(--serif); font-size: 16px; line-height: 2;
  color: var(--ink-2); max-width: 560px; margin: 0 auto;
}
.raw-text .tok {
  padding: 1px 2px; border-radius: 3px;
  transition: background .25s, color .25s;
}
.raw-text .tok.hl { background: var(--blue-soft); color: var(--blue-deep); }

.chunk-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.tchunk {
  border: 1px solid var(--blue-line); background: var(--blue-soft);
  border-radius: 7px; padding: 7px 9px; cursor: default;
  transition: transform .18s, box-shadow .18s;
}
.tchunk:hover { transform: translateY(-2px); box-shadow: var(--shadow-s); }
.tchunk-head {
  font-family: var(--sans); font-size: 9.5px; font-weight: 650;
  letter-spacing: .06em; color: var(--blue-deep); opacity: .75;
  margin-bottom: 4px; text-transform: uppercase;
}
.tchunk-toks { display: flex; gap: 2px; }
.tchunk-toks i {
  width: 13px; height: 16px; border-radius: 2px;
  background: #fff; border: 1px solid var(--blue-line);
  display: block;
}
.tchunk-toks i.empty { opacity: .3; border-style: dashed; background: transparent; }

.raw-img { display: inline-block; position: relative; }
.raw-img img {
  width: 150px; height: 150px; object-fit: cover;
  border-radius: 8px; border: 1px solid var(--line); display: block;
}
.raw-img-cap {
  display: block; font-family: var(--mono); font-size: 10.5px;
  color: var(--faint); margin-top: 6px;
}
.grid16 {
  display: grid; grid-template-columns: repeat(16, 1fr);
  gap: 1.5px; width: 192px; margin: 0 auto;
  padding: 5px; border-radius: 6px;
  background: var(--green-soft); border: 1px solid var(--green-line);
}
.grid16 i { aspect-ratio: 1; background: #fff; border-radius: 1px; opacity: .85; }
.mini {
  font-family: var(--sans); font-size: 11.5px; color: var(--muted);
  margin: 9px 0 0; text-align: center;
}

.state-box {
  display: inline-flex; flex-direction: column; align-items: center; gap: 5px;
  border-radius: 8px; padding: 13px 24px;
}
.sb-math { font-size: 1.08rem; white-space: nowrap; }
.state-box.blue  { background: var(--blue-soft);  border: 1px solid var(--blue-line);  color: var(--blue-deep); }
.state-box.green { background: var(--green-soft); border: 1px solid var(--green-line); color: var(--green-deep); }
.state-note {
  font-family: var(--sans); font-size: 11.5px; font-style: normal;
  color: var(--muted); letter-spacing: .01em;
}

/* ───────── attention mask demo ───────── */
.mask-wrap { display: grid; grid-template-columns: auto 1fr; gap: 30px; padding: 24px 22px; align-items: center; }
.mask-grid-area {
  display: grid;
  grid-template-columns: 58px auto;
  grid-template-rows: auto auto;
  gap: 5px;
}
.mask-corner {
  font-family: var(--sans); font-size: 9px; color: var(--faint);
  line-height: 1.3; align-self: end; text-align: right;
}
.mask-cols, .mask-rows { display: grid; gap: 3px; }
.mask-cols { grid-template-columns: repeat(7, 30px); }
.mask-rows { grid-template-rows: repeat(7, 30px); align-content: start; }
.mask-cols span, .mask-rows span {
  font-family: var(--serif); font-size: 12px; font-style: italic;
  color: var(--muted); display: flex; align-items: center; justify-content: center;
}
.mask-cols span sub, .mask-rows span sub { font-style: normal; font-size: .7em; }
.mask-grid { display: grid; grid-template-columns: repeat(7, 30px); gap: 3px; }
.mask-cell {
  width: 30px; height: 30px; border-radius: 4px;
  background: var(--grey-soft); border: 1px solid transparent;
  transition: background .18s, border-color .18s, transform .18s, opacity .18s;
}
.mask-row-wrap { display: contents; }
.mask-cell.past { background: var(--green-soft); border-color: var(--green-line); }
.mask-cell.cur  { background: var(--purple-soft); border-color: var(--purple-line); }
.mask-cell.fut  { background: var(--grey-soft); }
.mask-grid.is-focus .mask-cell { opacity: .3; }
.mask-grid.is-focus .mask-cell.row-on { opacity: 1; transform: scale(1.06); }
.mask-rows span.row-on { color: var(--purple); font-weight: 700; }
.mask-rows span { cursor: pointer; }

.legend { list-style: none; margin: 0 0 14px; padding: 0; }
.legend li {
  font-family: var(--sans); font-size: 12.5px; color: var(--muted);
  display: flex; align-items: center; gap: 9px; margin-bottom: 7px;
}
.lg { width: 14px; height: 14px; border-radius: 3px; flex: none; display: inline-block; }
.lg.past { background: var(--green-soft); border: 1px solid var(--green-line); }
.lg.cur  { background: var(--purple-soft); border: 1px solid var(--purple-line); }
.lg.fut  { background: var(--grey-soft); border: 1px solid #d7dadf; }
.lg.ctx  { background: #d8dde4; border: 1px solid #aab3be; }
.lg.tgt  { background: repeating-linear-gradient(45deg, #f3eefc, #f3eefc 3px, #e2d9f5 3px, #e2d9f5 6px); border: 1px dashed var(--purple); }

.mask-caption {
  font-family: var(--sans); font-size: 12.8px; line-height: 1.6;
  color: var(--muted); margin: 0;
}
.mask-caption strong { color: var(--ink-2); }

/* ───────── flow (t) demo ───────── */
.flow-slider {
  display: flex; align-items: center; gap: 16px;
  padding: 20px 24px 4px;
}
.flow-slider label { font-size: 1.15rem; color: var(--ink-2); width: 14px; }
.flow-slider output {
  font-family: var(--mono); font-style: normal; font-size: 14px;
  color: var(--purple); width: 46px; text-align: right; font-weight: 500;
}
#t-slider {
  flex: 1; -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 3px; outline: none;
  background: linear-gradient(90deg, #cfd3da 0%, var(--purple-line) 50%, var(--purple) 100%);
}
#t-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 2px solid var(--purple);
  cursor: pointer; box-shadow: var(--shadow-s);
  transition: transform .12s;
}
#t-slider::-webkit-slider-thumb:hover { transform: scale(1.12); }
#t-slider::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: #fff; border: 2px solid var(--purple); cursor: pointer;
}
.flow-axis {
  display: flex; justify-content: space-between;
  padding: 0 24px 16px; margin-top: 2px;
  font-family: var(--sans); font-size: 11.5px; color: var(--faint);
}
.play-btn {
  font-family: var(--sans); font-size: 12.5px; font-weight: 550;
  padding: 6px 14px; border-radius: 7px;
  border: 1px solid var(--purple-line); background: var(--purple-soft);
  color: var(--purple); cursor: pointer; transition: background .16s;
}
.play-btn:hover { background: #ded6ef; }

.flow-panes {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--line); border-top: 1px solid var(--line);
}
.flow-pane { background: #fff; padding: 16px 20px 14px; }
.fp-head {
  font-family: var(--sans); font-size: 12px; font-weight: 600;
  display: flex; align-items: flex-start; gap: 7px; margin-bottom: 14px;
  line-height: 1.4; min-height: 2.8em;
}
.fp-head .dot { margin-top: .42em; }
.fp-head.blue  { color: var(--blue-deep); }
.fp-head.green { color: var(--green-deep); }
.dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot.blue { background: var(--blue); }
.dot.green { background: var(--green); }
.fp-body { min-height: 176px; display: flex; align-items: center; justify-content: center; }
.fp-foot {
  font-family: var(--sans); font-size: 11.5px; color: var(--faint);
  margin: 12px 0 0; line-height: 1.5;
}

.flow-text {
  display: flex; flex-wrap: wrap; gap: 5px 7px;
  justify-content: center; align-content: center;
  font-family: var(--mono); font-size: 13.5px;
}
.flow-text .ftok {
  padding: 4px 7px; border-radius: 5px;
  background: var(--bg-soft); border: 1px solid var(--line);
  color: var(--faint); transition: color .2s, background .2s, border-color .2s, filter .2s;
  white-space: pre;
}
.flow-text .ftok.on {
  color: var(--blue-deep); background: var(--blue-soft);
  border-color: var(--blue-line);
}

.flow-img { position: relative; width: 176px; height: 176px; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); }
.flow-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.flow-img canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ───────── task demo ───────── */
.task-wrap { display: grid; grid-template-columns: 196px 1fr; gap: 0; }
.task-list {
  border-right: 1px solid var(--line);
  padding: 14px 12px; display: flex; flex-direction: column; gap: 2px;
  background: #fcfcfd;
}
.task-group-label {
  font-family: var(--sans); font-size: 10px; font-weight: 650;
  letter-spacing: .1em; text-transform: uppercase; color: var(--faint);
  margin: 8px 0 5px 8px;
}
.task-group-label:first-child { margin-top: 0; }
.task-btn {
  font-family: var(--sans); font-size: 12.8px; text-align: left;
  padding: 7px 11px; border: none; border-radius: 6px;
  background: transparent; color: var(--ink-2); cursor: pointer;
  transition: background .15s, color .15s;
}
.task-btn:hover { background: var(--bg-soft); }
.task-btn.is-on { background: var(--purple-soft); color: var(--purple); font-weight: 600; }

.task-view { padding: 24px 22px 20px; min-height: 212px; display: flex; flex-direction: column; }
.task-strip {
  display: flex; align-items: center; gap: 7px; flex-wrap: wrap;
  min-height: 86px;
}
.tcell {
  border-radius: 7px; padding: 9px 11px; min-width: 56px;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  font-family: var(--sans); animation: pop .32s cubic-bezier(.2,.8,.3,1) backwards;
}
@keyframes pop { from { opacity: 0; transform: translateY(6px) scale(.95); } to { opacity: 1; transform: none; } }
.tcell-name { font-size: 10.5px; font-weight: 650; letter-spacing: .02em; }
.tcell-role { font-size: 9.5px; letter-spacing: .05em; text-transform: uppercase; opacity: .72; }
.tcell.ctx.text   { background: var(--blue-soft);  border: 1px solid var(--blue-line);  color: var(--blue-deep); }
.tcell.ctx.vision { background: var(--green-soft); border: 1px solid var(--green-line); color: var(--green-deep); }
.tcell.tgt {
  border-style: dashed; border-width: 1.5px;
  box-shadow: 0 0 0 3px rgba(122,107,166,.12);
}
.tcell.tgt.text   { background: repeating-linear-gradient(45deg,#eef4fb,#eef4fb 4px,#e0eaf7 4px,#e0eaf7 8px); border-color: var(--purple); color: var(--blue-deep); }
.tcell.tgt.vision { background: repeating-linear-gradient(45deg,#edf6e8,#edf6e8 4px,#e0efd8 4px,#e0efd8 8px); border-color: var(--purple); color: var(--green-deep); }
.tarrow { color: var(--faint); font-size: 14px; }

.task-legend {
  display: flex; gap: 18px; flex-wrap: wrap; align-items: center;
  margin: 18px 0 12px; padding-top: 14px; border-top: 1px solid var(--line-soft);
}
.task-legend span {
  font-family: var(--sans); font-size: 11.5px; color: var(--muted);
  display: flex; align-items: center; gap: 6px;
}
.task-desc {
  font-family: var(--sans); font-size: 13px; line-height: 1.6;
  color: var(--muted); margin: 0; flex: 1;
}
.task-desc strong { color: var(--ink-2); }
.task-desc code {
  font-family: var(--mono); font-size: 11.5px;
  background: var(--bg-soft); padding: 1px 5px; border-radius: 4px; color: var(--ink-2);
}

/* ───────── phase demo ───────── */
.phase-view { padding: 24px 22px 20px; }
.phase-strip { display: flex; gap: 9px; align-items: center; min-height: 82px; flex-wrap: wrap; }
.pcell {
  border-radius: 7px; padding: 10px 12px; min-width: 60px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  font-family: var(--sans); position: relative;
  transition: background .3s, border-color .3s, opacity .3s, transform .3s;
}
.pcell-name { font-size: 11px; font-weight: 650; }
.pcell-bar {
  width: 42px; height: 5px; border-radius: 3px;
  background: rgba(255,255,255,.75); box-shadow: inset 0 0 0 1px rgba(0,0,0,.09);
  overflow: hidden; position: relative;
}
.pcell-bar i { position: absolute; inset: 0 auto 0 0; background: var(--purple); border-radius: 3px; transition: width .3s; }
.pcell.text   { background: var(--blue-soft);  border: 1px solid var(--blue-line);  color: var(--blue-deep); }
.pcell.vision { background: var(--green-soft); border: 1px solid var(--green-line); color: var(--green-deep); }
.pcell.pending { opacity: .3; }
.pcell.active { box-shadow: 0 0 0 3px rgba(122,107,166,.2); border-color: var(--purple); transform: translateY(-3px); }
.pcell.done .pcell-bar i { width: 100% !important; background: var(--green); }
.phase-desc {
  font-family: var(--sans); font-size: 13px; line-height: 1.6;
  color: var(--muted); margin: 18px 0 0; padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}
.phase-desc strong { color: var(--ink-2); }

/* ─────────────────────── §7 · WHAT IT ADMITS ─────────────────────── */

/* "what you add / what stays the same" */
.plug {
  display: grid; grid-template-columns: 1fr auto 1.15fr;
  gap: 0; align-items: stretch; margin: 1.9em 0 0;
}
.plug-col { border: 1px solid var(--line); border-radius: 11px; padding: 17px 20px 15px; background: #fff; }
.plug-col h5 { margin-bottom: 11px; font-size: 12.5px; }
.plug-col ul { list-style: none; margin: 0; padding: 0; }
.plug-col li {
  position: relative; font-family: var(--sans); font-size: 12.8px; line-height: 1.5;
  color: var(--muted); padding: 4px 0 4px 14px;
}
.plug-col li::before {
  content: ""; position: absolute; left: 0; top: .78em;
  width: 5px; height: 5px; border-radius: 50%;
}
.pg-k { font-weight: 650; color: var(--ink-2); margin-right: 3px; }
.plug-note { font-family: var(--sans); font-size: 11.5px; color: var(--faint); margin: 11px 0 0; font-style: italic; }

.plug-new { border-color: var(--green-line); background: linear-gradient(180deg, #fbfdfa, #f4faf1); }
.plug-new h5 { color: var(--green-deep); }
.plug-new li::before { background: var(--green); }
.plug-same { border-color: var(--purple-line); background: linear-gradient(180deg, #fbfafd, #f5f2fa); }
.plug-same h5 { color: var(--purple); }
.plug-same li::before { background: var(--purple-line); }

.plug-arrow {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; color: var(--faint); padding: 0 16px;
}
.plug-arrow span { font-family: var(--sans); font-size: 10.5px; letter-spacing: .07em; text-transform: uppercase; }

.plug-never {
  font-family: var(--sans); font-size: 12.5px; line-height: 1.6;
  color: var(--muted); background: var(--bg-soft);
  border: 1px dashed var(--line); border-radius: 9px;
  padding: 12px 18px; margin: 12px 0 1.6em !important;
}
.plug-never strong { color: var(--ink-2); }

/* modality palette cards */
.modalities { display: grid; grid-template-columns: repeat(3, 1fr); gap: 11px; margin: 1.6em 0 12px; }
.mod-card {
  border: 1px solid var(--line); border-radius: 10px; padding: 13px 15px;
  background: #fff; font-family: var(--sans);
}
.mod-card.spec { border-style: dashed; background: #fcfcfd; }
.mod-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.mod-ico {
  width: 24px; height: 24px; border-radius: 6px; flex: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #fff;
}
.mod-name { font-size: 13px; font-weight: 650; color: var(--ink); line-height: 1.2; }
.mod-rule { font-size: 11.8px; line-height: 1.5; color: var(--muted); margin: 0 0 7px; }
.mod-rule b { color: var(--ink-2); font-weight: 600; }
.mod-codec { font-family: var(--mono); font-size: 10.5px; color: var(--faint); line-height: 1.5; }

.badge-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 5px; }
.badge-dot.trained { background: var(--green); }
.badge-dot.spec { background: #fff; border: 1.5px dashed var(--faint); }
.mod-foot {
  font-family: var(--sans); font-size: 12px; color: var(--muted);
  margin: 0 0 2em; display: flex; align-items: center; gap: 4px; flex-wrap: wrap;
}
.mod-foot strong { color: var(--ink-2); }

/* composer */
.comp-presets {
  display: flex; gap: 6px; flex-wrap: wrap; align-items: center;
  padding: 13px 18px; border-bottom: 1px solid var(--line-soft); background: #fcfcfd;
}
.cp-label {
  font-family: var(--sans); font-size: 10.5px; font-weight: 650;
  letter-spacing: .1em; text-transform: uppercase; color: var(--faint); margin-right: 3px;
}
.cp-btn {
  font-family: var(--sans); font-size: 11.8px; padding: 4px 11px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff;
  color: var(--ink-2); cursor: pointer; transition: border-color .15s, background .15s, color .15s;
}
.cp-btn:hover { border-color: var(--purple-line); background: var(--purple-soft); color: var(--purple); }

.comp-palette {
  display: flex; gap: 6px; flex-wrap: wrap;
  padding: 14px 18px; border-bottom: 1px solid var(--line-soft);
}
.pal-btn {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--sans); font-size: 12px; font-weight: 550;
  padding: 5px 11px 5px 7px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.pal-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-s); }
.pal-btn.spec { border-style: dashed; color: var(--muted); }
.pal-ico { width: 18px; height: 18px; border-radius: 5px; flex: none; display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 700; color: #fff; }
.pal-plus { color: var(--faint); font-weight: 400; }

.comp-stage { padding: 20px 18px 14px; }
.comp-strip { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; min-height: 78px; }
.comp-empty {
  font-family: var(--sans); font-size: 12.5px; color: var(--faint);
  border: 1px dashed var(--line); border-radius: 9px;
  padding: 20px; width: 100%; text-align: center;
}
.ccell {
  position: relative; border-radius: 8px; padding: 9px 12px 8px; min-width: 62px;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  font-family: var(--sans); cursor: pointer;
  transition: transform .15s, box-shadow .15s;
  animation: pop .3s cubic-bezier(.2,.8,.3,1) backwards;
}
.ccell:hover { transform: translateY(-2px); box-shadow: var(--shadow-s); }
.ccell-i { font-size: 9.5px; opacity: .6; letter-spacing: .03em; }
.ccell-n { font-size: 11.5px; font-weight: 650; line-height: 1.15; }
.ccell-r { font-size: 9px; letter-spacing: .06em; text-transform: uppercase; opacity: .75; }
.ccell.tgt { border-style: dashed !important; border-width: 1.5px !important; box-shadow: 0 0 0 3px rgba(122,107,166,.12); }
.ccell-x {
  position: absolute; top: -6px; right: -6px; width: 16px; height: 16px;
  border-radius: 50%; background: #fff; border: 1px solid var(--line);
  color: var(--faint); font-size: 11px; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center; opacity: 0;
  transition: opacity .15s, color .15s, border-color .15s;
}
.ccell:hover .ccell-x { opacity: 1; }
.ccell-x:hover { color: #c45a4e; border-color: #e0a9a1; }
.comp-hint { font-family: var(--sans); font-size: 11.5px; color: var(--faint); margin: 14px 0 0; }

.comp-out {
  display: grid; grid-template-columns: auto 1fr; gap: 30px; align-items: center;
  padding: 20px 18px; border-top: 1px solid var(--line); background: #fcfcfd;
}
.comp-mask-label {
  font-family: var(--sans); font-size: 9.5px; font-weight: 650;
  letter-spacing: .09em; text-transform: uppercase; color: var(--faint); margin-bottom: 8px;
}
.comp-mask { display: grid; gap: 2px; }
.comp-mask .mask-cell { width: 24px; height: 24px; border-radius: 4px; }
.comp-mask-none { font-family: var(--sans); font-size: 11.5px; color: var(--faint); }
.comp-mask-key {
  display: flex; flex-direction: column; gap: 4px; margin-top: 10px;
  font-family: var(--sans); font-size: 10.5px; color: var(--faint);
}
.comp-mask-key span { display: flex; align-items: center; gap: 6px; }
.comp-mask-key i { width: 10px; height: 10px; border-radius: 3px; flex: none; }

.comp-task { font-family: var(--sans); font-size: 14.5px; font-weight: 650; color: var(--ink); margin-bottom: 6px; }
.comp-desc { font-family: var(--sans); font-size: 12.8px; line-height: 1.6; color: var(--muted); margin: 0 0 10px; }
.comp-desc b { color: var(--ink-2); font-weight: 600; }
.comp-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--sans); font-size: 11.5px; font-weight: 550;
  padding: 4px 11px; border-radius: 999px;
}
.comp-badge.ok   { background: var(--green-soft); color: var(--green-deep); border: 1px solid var(--green-line); }
.comp-badge.warn { background: #fdf4e3; color: #87682c; border: 1px solid #e8d2a4; }
.comp-badge.spec { background: #fff; color: var(--muted); border: 1px dashed var(--faint); }
.comp-badge b { font-weight: 650; }

.limits { list-style: none; padding: 0; margin: 1.3em 0; }
.limits li {
  position: relative; padding-left: 26px; margin-bottom: 1.05em;
  font-size: 1rem; line-height: 1.62; color: var(--ink-2);
}
.limits li::before {
  content: ""; position: absolute; left: 4px; top: .62em;
  width: 7px; height: 7px; border-radius: 2px;
  background: var(--purple-line);
}
.closing {
  font-size: 1.06rem; line-height: 1.62; color: var(--ink-2);
  border-top: 1px solid var(--line); padding-top: 1.3em; margin-top: 1.8em !important;
}

.numbers {
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--bg-soft); padding: 0 18px; margin: 2em 0 0;
}
.numbers summary {
  font-family: var(--sans); font-size: 13px; font-weight: 600;
  color: var(--ink-2); cursor: pointer; padding: 14px 0; list-style: none;
  display: flex; align-items: center; gap: 8px;
}
.numbers summary::-webkit-details-marker { display: none; }
.numbers summary::before { content: "▸"; color: var(--faint); transition: transform .18s; }
.numbers[open] summary::before { transform: rotate(90deg); }
.numbers p {
  font-size: .95rem; line-height: 1.62; color: var(--muted);
  margin: 0 0 16px; padding-top: 2px;
  border-top: 1px solid var(--line-soft);
}
.numbers p strong { color: var(--ink-2); }

.bib { position: relative; }
.bib pre {
  background: #171a1d; color: #dfe4ea;
  border-radius: 9px; padding: 20px 22px; overflow-x: auto;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.62;
  margin: 1em 0 1.4em;
}
.copy-btn {
  position: absolute; top: 14px; right: 14px; z-index: 2;
  font-family: var(--sans); font-size: 11.5px; font-weight: 550;
  padding: 5px 12px; border-radius: 6px; cursor: pointer;
  background: rgba(255,255,255,.1); color: #cdd4dc;
  border: 1px solid rgba(255,255,255,.2);
  transition: background .15s, color .15s;
}
.copy-btn:hover { background: rgba(255,255,255,.2); color: #fff; }
.ack { font-size: .95rem; color: var(--muted); }

.foot {
  border-top: 1px solid var(--line); background: var(--bg-soft);
  padding: 30px 32px; margin-top: 20px;
}
.foot-inner { max-width: 1160px; margin: 0 auto; }
.foot p {
  font-family: var(--sans); font-size: 12.5px; color: var(--muted);
  margin: 0 0 6px; line-height: 1.6;
}
.foot-links a { color: var(--muted); border-bottom: none; }
.foot-links a:hover { color: var(--blue); }

/* ─────────────────────────── RESPONSIVE ─────────────────────────── */
@media (max-width: 1080px) {
  /* drop the grid entirely: a single-column grid would place the article in an
     implicit, content-sized track and let wide children stretch the page */
  .page { display: block; padding: 40px 28px; }
  .toc { position: static; margin: 0 auto 40px; max-width: 760px; }
  .toc nav { flex-direction: row; flex-wrap: wrap; gap: 4px; }
  .toc nav a { border-left: none; border: 1px solid var(--line); border-radius: 6px; font-size: 12px; padding: 5px 10px; }
  .toc nav a.is-active { border-color: var(--blue-line); }
  .fig-wide { width: 100%; margin-left: 0; }
  .two-col { width: 100%; margin-left: 0; }
  .article { max-width: 760px; margin: 0 auto; }
}
@media (max-width: 760px) {
  body { font-size: 17.5px; }
  .hero { padding: 64px 22px 54px; }
  .byline { padding: 24px 22px; }
  .byline-grid { grid-template-columns: 1fr 1fr; gap: 18px 24px; }
  .page { padding: 32px 20px; }
  .para-cards { grid-template-columns: 1fr; }
  .plug { grid-template-columns: 1fr; gap: 10px; }
  .plug-arrow { flex-direction: row; padding: 2px 0; }
  .plug-arrow svg { transform: rotate(90deg); }
  .modalities { grid-template-columns: 1fr 1fr; }
  .comp-out { grid-template-columns: 1fr; gap: 18px; }
  .two-col { grid-template-columns: 1fr; }
  .flow-panes { grid-template-columns: 1fr; }
  .task-wrap { grid-template-columns: 1fr; }
  .task-list { border-right: none; border-bottom: 1px solid var(--line); flex-direction: row; flex-wrap: wrap; }
  .task-group-label { width: 100%; margin-left: 2px; }
  .mask-wrap { grid-template-columns: 1fr; gap: 20px; }
  .mask-cols { grid-template-columns: repeat(7, 26px); }
  .mask-rows { grid-template-rows: repeat(7, 26px); }
  .mask-grid { grid-template-columns: repeat(7, 26px); }
  .mask-cell { width: 26px; height: 26px; }
  .article h2 { font-size: 1.5rem; }
  .bib pre { white-space: pre-wrap; word-break: break-word; }
  .data-table { font-size: 12px; }
  .data-table th, .data-table td { padding: 7px 5px; }
}

@media (max-width: 460px) {
  .modalities { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}