/* The Helpful Agent Problem: project page, light edition.
   Layout: a tinted header band with the opening figure resting on its edge,
   then a contents rail beside the article. Figures sit on soft panels;
   pastel highlights tie the prose to the agents' colors. */

:root {
  --paper: #ffffff;
  --band: #eef6f5;
  --surface: #f5f8f8;
  --ink: #000000;
  --ink-2: #4b5157;
  --ink-3: #737981;
  --rule: #e3e7e9;
  --rule-2: #cfd5d9;
  --accent: #0b7f86;
  --accent-wash: #e3f2f1;

  --alice: #e0861a;
  --alice-wash: #fff3e2;
  --alice-line: #f1c890;
  --bob: #2f6feb;
  --bob-wash: #ebf2ff;
  --bob-line: #b4cbf6;
  --rev: #7468d8;
  --rev-wash: #f2f0fe;
  --rev-line: #cec8f4;
  --absent: #c9416c;
  --absent-wash: #ffeaf0;

  --pass: #1a8150;
  --pass-wash: #e5f5eb;
  --fail: #c23838;
  --fail-wash: #fdecec;

  --hl-rev: #e9e5ff;
  --hl-bob: #dce9ff;
  --hl-harm: #ffdde7;

  --c-favor: #2f6feb;
  --c-harm: #c9416c;

  --serif: "Source Serif 4", "Source Serif Pro", Charter, "Bitstream Charter", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 10px;
}

*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; scroll-padding-top: 24px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-size: 18px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
b, strong { font-weight: 600; }
code, pre { font-family: var(--mono); }
code { font-size: 0.82em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.shell { max-width: 1180px; margin: 0 auto; padding: 0 28px; }

/* ---------- header band ---------- */
.band { background: var(--band); padding-top: 22px; padding-bottom: 90px; }
.overlap { margin-top: -72px; }
.logo { display: inline-block; line-height: 0; margin-bottom: 22px; }
.logo img { height: 38px; width: auto; }
.hero h1 { margin: 0; font-size: clamp(32px, 4.4vw, 52px); line-height: 1.08; font-weight: 400; letter-spacing: -0.02em; }
.subtitle { margin: 12px 0 0; font-size: clamp(18px, 2.05vw, 24px); line-height: 1.35; font-style: italic; font-weight: 300; color: var(--ink-2); }
@media (min-width: 900px) { .hero h1, .subtitle { white-space: nowrap; } }
.title {
  background: linear-gradient(100deg, #0b7f86 0%, #2f6feb 48%, #7468d8 72%, #c9416c 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  display: inline-block; font-weight: 500 !important; padding-bottom: 0.06em;
}
.title em { font-style: italic; font-weight: 400; padding-right: 0.04em; }

.byline {
  display: grid; grid-template-columns: 1.6fr 1.1fr 1fr; gap: 12px 28px;
  margin: 24px 0 0; padding: 12px 0; border-top: 1px solid var(--rule-2); border-bottom: 1px solid var(--rule-2);
}
.byline dt { font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); margin-bottom: 4px; }
.byline dd { margin: 0; font-size: 16px; line-height: 1.45; }
.pills { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
  display: inline-block; font-family: var(--mono); font-size: 12.5px; text-decoration: none; line-height: 1;
  color: var(--accent); border: 1px solid var(--accent); border-radius: 999px; padding: 6px 12px; background: var(--paper);
}
.pill:hover { background: var(--accent-wash); }
.pill.solid { background: var(--accent); color: #fff; }
.pill.solid:hover { background: #096b71; }
@media (max-width: 900px) { .byline { grid-template-columns: 1fr 1fr; } .byline > div:first-child { grid-column: 1 / -1; } }
@media (max-width: 520px) { .byline { grid-template-columns: 1fr; } }

/* ---------- quotes ---------- */
.hero-top { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px 48px; align-items: end; }
.hero-side { display: flex; flex-direction: column; gap: 22px; }
.hero-side .logo { margin: 0; }
.hero-title { padding-top: 8px; }
.quote { margin: 0; padding: 2px 0 2px 18px; border-left: 3px solid var(--accent); max-width: 340px; }
.quote p { margin: 0; font-size: 19px; line-height: 1.4; font-style: italic; }
.quote footer { margin-top: 6px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); }
.quote cite { font-style: italic; font-family: var(--serif); font-size: 13.5px; }
.tldr .tldr-quote { margin: 0 0 20px; max-width: 520px; }
.sec .quote { margin: 6px 0 22px; max-width: 520px; }
@media (max-width: 1100px) { .hero-top { grid-template-columns: minmax(0, 1fr); } .hero-side { order: -1; } .epigraph { max-width: 520px; } }

/* ---------- figures (shared) ---------- */
.fig { margin: 36px 0 0; background: var(--surface); border: 1px solid var(--rule); border-radius: 16px; padding: 20px; }
.hero-fig { margin-top: 0; background: var(--paper); box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02), 0 12px 32px -18px rgba(11, 60, 70, 0.28); }
.fig figcaption { margin: 16px 0 0; font-size: 15.5px; line-height: 1.55; color: var(--ink-2); }
.fig-no { font-family: var(--mono); font-size: 12px; font-weight: 600; color: var(--accent); margin-right: 8px; }
figcaption code { font-size: 0.85em; }

.seg {
  display: inline-flex; align-items: stretch; flex-wrap: wrap;
  border: 1px solid var(--rule-2); border-radius: 8px; overflow: hidden; background: #fff;
  font-family: var(--mono); font-size: 12.5px;
}
.seg-label { padding: 7px 11px; color: var(--ink-3); border-right: 1px solid var(--rule-2); }
.seg button { font: inherit; cursor: pointer; border: 0; border-right: 1px solid var(--rule-2); background: #fff; color: var(--ink-2); padding: 7px 13px; }
.seg button:last-child { border-right: 0; }
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed="true"] { background: var(--accent-wash); color: var(--ink); font-weight: 600; }
.replay {
  font-family: var(--mono); font-size: 12.5px; cursor: pointer;
  background: #fff; color: var(--ink-2); border: 1px solid var(--rule-2); border-radius: 8px; padding: 6px 12px;
}
.replay:hover { color: var(--ink); border-color: var(--ink-3); }

.channel, .file, .tests { background: #fff; border: 1px solid var(--rule-2); border-radius: var(--radius); }
.channel { padding: 10px 14px 14px; min-height: 360px; }
.scene .channel { min-height: 0; }
.scene .feed { margin-top: 10px; gap: 9px; }
.scene .outcome { margin-top: 12px; }
.hero-fig figcaption { margin-top: 8px; }
.hero-fig { padding: 16px 20px; }
.channel-head { display: flex; align-items: center; gap: 10px; padding-bottom: 8px; border-bottom: 1px solid var(--rule); font-family: var(--mono); }
.chan-name { font-size: 13px; font-weight: 600; }
.task-tag { flex: 1; font-size: 12px; color: var(--ink-3); }
.members { display: flex; gap: 6px; flex-wrap: wrap; }
.m { display: inline-flex; align-items: center; gap: 4px; font-size: 11.5px; color: var(--ink-2); border: 1px solid var(--rule-2); border-radius: 999px; padding: 1px 8px 1px 3px; }
.m svg { width: 16px; height: 16px; }
.m-alice svg { color: var(--alice); }
.m-bob svg { color: var(--bob); }
.m-rev svg { color: var(--rev); }
.away-tag { display: none; font-style: normal; font-size: 10px; font-weight: 600; color: var(--ink-3); background: #eef0f2; border-radius: 999px; padding: 0 5px; margin-left: 2px; }
.m-rev.is-away { opacity: 0.55; }
.m-rev.is-away .away-tag { display: inline; }

.feed { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-direction: column; gap: 11px; }
.feed > li { animation: rise 0.35s ease-out both; }
.feed .empty { font-style: italic; color: var(--ink-3); font-size: 16px; padding: 16px 0; }
.msg { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 10px; align-items: start; }
.msg.right { grid-template-columns: minmax(0, 1fr) 30px; }
.msg.right .av { order: 2; }
.msg.right .bubble { order: 1; justify-self: end; }
.av { width: 30px; height: 30px; flex: none; }
.av-alice { color: var(--alice); }
.av-bob { color: var(--bob); }
.av-admin, .av-reviewer { color: var(--rev); }
.av-absent, .av-dave { color: var(--absent); }
.bubble { border: 1px solid var(--rule-2); border-radius: 12px; padding: 7px 12px 8px; max-width: 56ch; font-size: 16px; line-height: 1.45; overflow-wrap: anywhere; }
.msg:not(.right) .bubble { border-top-left-radius: 4px; }
.msg.right .bubble { border-top-right-radius: 4px; }
.bubble .who { display: block; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); margin-bottom: 2px; }
.bubble .who b { color: var(--ink); font-weight: 600; }
.bubble.alice { background: var(--alice-wash); border-color: var(--alice-line); }
.bubble.bob { background: var(--bob-wash); border-color: var(--bob-line); }
.bubble.admin, .bubble.reviewer { background: var(--rev-wash); border-color: var(--rev-line); }
.bubble code { background: rgba(0, 0, 0, 0.055); padding: 0 3px; border-radius: 3px; }
.bubble.request { background: #fff; border-style: dashed; }
.req-label { display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: baseline; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); margin-bottom: 3px; }
.req-label b { color: var(--ink); font-weight: 600; }
.req-status { font-size: 11px; border: 1px solid var(--rule-2); border-radius: 999px; padding: 0 7px; color: var(--ink-2); }
.req-status.ok { color: var(--pass); border-color: currentColor; background: var(--pass-wash); }
.req-status.no { color: var(--fail); border-color: currentColor; background: var(--fail-wash); }

.event, .sys { display: flex; justify-content: center; }
.event span, .sys span {
  display: inline-block; max-width: 100%; text-align: center; overflow-wrap: anywhere;
  font-family: var(--mono); font-size: 12px; line-height: 1.5; color: var(--ink-3);
  border: 1px dashed var(--rule-2); border-radius: 999px; padding: 2px 12px;
}
.event.edit span { border-style: solid; color: var(--ink); font-weight: 500; }
.event.edit.alice span { border-color: var(--alice); background: var(--alice-wash); }
.event.edit.bob span { border-color: var(--bob); background: var(--bob-wash); }
.event.edit.admin span { border-color: var(--rev); background: var(--rev-wash); }
.event code { font-size: 1em; }

@keyframes rise { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

.repo, .side { display: flex; flex-direction: column; gap: 14px; }
.file { overflow: hidden; }
.file-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 4px 10px; padding: 8px 12px; border-bottom: 1px solid var(--rule); font-family: var(--mono); font-size: 12px; }
.file-head code { font-size: 12px; font-weight: 600; overflow-wrap: anywhere; }
.owner { color: var(--ink-3); }
.owner b { color: var(--ink-2); font-weight: 600; }
.code { margin: 0; padding: 8px 0; font-size: 13px; line-height: 1.7; min-height: 44px; }
.code span { display: block; padding: 0 12px 0 28px; text-indent: -16px; white-space: pre-wrap; overflow-wrap: anywhere; }
.code .add { background: var(--pass-wash); }
.code .del { background: var(--fail-wash); }
.code .add::before { content: "+ "; color: var(--pass); }
.code .del::before { content: "- "; color: var(--fail); }
.code .ctx::before { content: "  "; }
.code .cm { color: var(--ink-3); }
.code .note { font-family: var(--serif); font-style: italic; font-size: 15px; color: var(--ink-3); }
.code .by { font-size: 11px; color: var(--ink-3); padding-top: 3px; }
.code .flash { animation: flash 0.7s ease-out; }
@keyframes flash { from { filter: brightness(1.12); transform: translateX(-3px); } to { filter: none; transform: none; } }
.file-note { margin: 0; padding: 0 12px 10px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); min-height: 1.6em; }

.tests { padding: 10px 12px; }
.tests-title { margin: 0 0 4px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); }
.test { display: grid; grid-template-columns: 26px minmax(0, 1fr) auto; gap: 3px 10px; align-items: center; padding: 7px 0; border-top: 1px solid var(--rule); }
.tests-title + .test, #tests > .test:first-child { border-top: 0; }
.test .av { width: 26px; height: 26px; }
.t-name { font-size: 16px; font-weight: 500; line-height: 1.25; }
.t-name small { display: block; font-size: 14px; font-weight: 400; color: var(--ink-3); }
.t-why { grid-column: 2 / -1; font-family: var(--mono); font-size: 11.5px; line-height: 1.45; color: var(--fail); overflow-wrap: anywhere; }
.test-sep { margin: 8px 0 0; padding-top: 4px; font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
.chip {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px; min-width: 62px;
  font-family: var(--mono); font-size: 11.5px; font-weight: 600;
  border: 1px solid var(--rule-2); border-radius: 999px; padding: 2px 9px; background: #fff; color: var(--ink-3);
}
.chip svg { width: 12px; height: 12px; }
.chip[data-state="pass"] { color: var(--pass); border-color: currentColor; background: var(--pass-wash); }
.chip[data-state="fail"] { color: var(--fail); border-color: currentColor; background: var(--fail-wash); }
.chip.pop { animation: pop 0.4s ease-out; }
@keyframes pop { 0% { transform: scale(0.88); } 60% { transform: scale(1.06); } 100% { transform: none; } }

.outcome { margin: 18px 0 0; min-height: 1.35em; font-size: 24px; line-height: 1.3; font-weight: 600; }
.outcome.good { color: var(--pass); }
.outcome.bad { color: var(--fail); }
.outcome span { display: inline-block; animation: rise 0.4s ease-out both; }

/* figure 1 */
.scene-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.scene-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 18px; margin-top: 14px; }
.scene .channel-head { justify-content: space-between; flex-wrap: wrap; }

/* ---------- contents rail + article ---------- */
.layout { display: grid; grid-template-columns: 262px minmax(0, 1fr); gap: 44px; margin-top: 64px; align-items: start; }
.rail { position: sticky; top: 28px; padding-top: 4px; }
.rail-title { margin: 0 0 10px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); }
.rail ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule-2); }
.rail li { margin: 0; }
.rail a {
  display: block; padding: 5px 0 5px 14px; margin-left: -1px; border-left: 2px solid transparent;
  font-size: 14.5px; line-height: 1.35; color: var(--ink-2); text-decoration: none; white-space: nowrap;
}
.rail a:hover { color: var(--ink); }
.rail a[aria-current="true"] { color: var(--accent); border-left-color: var(--accent); font-weight: 500; }
.article { min-width: 0; }
.text { max-width: 680px; }
.text p { margin: 0 0 16px; }
@media (max-width: 1120px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 0; margin-top: 48px; }
  .rail { display: none; }
}

/* ---------- TL;DR ---------- */
.tldr { background: var(--band); border-radius: 16px; padding: 26px 30px 24px; }
.tldr-h { margin: 0 0 8px; font-family: var(--mono); font-size: 12.5px; font-weight: 600; color: var(--accent); }
.lead { margin: 0; max-width: 64ch; font-size: 20.5px; line-height: 1.6; }
mark { color: inherit; padding: 0.04em 0.14em; border-radius: 3px; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.hl-rev { background: var(--hl-rev); }
.hl-bob { background: var(--hl-bob); }
.hl-harm { background: var(--hl-harm); }
.figs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; margin: 24px 0 0; padding-top: 18px; border-top: 1px solid #cfe2e0; }
.figs > div { padding: 0 20px; border-left: 1px solid #cfe2e0; }
.figs > div:first-child { padding-left: 0; border-left: 0; }
.figs dt { font-size: 32px; line-height: 1; font-weight: 400; letter-spacing: -0.01em; }
.figs dd { margin: 8px 0 0; font-size: 15px; line-height: 1.45; color: var(--ink-2); }
@media (max-width: 640px) {
  .tldr { padding: 20px 18px; }
  .lead { font-size: 18.5px; }
  .figs { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .figs > div { padding: 0; border-left: 0; }
}

/* ---------- sections ---------- */
.sec { margin-top: 84px; }
.sec h2 { margin: 0 0 16px; font-size: 30px; text-wrap: balance; line-height: 1.18; font-weight: 400; letter-spacing: -0.012em; }

.table-wrap { margin-top: 28px; max-width: 760px; border: 1px solid var(--rule); border-radius: 14px; overflow: hidden; }
.mech { width: 100%; border-collapse: collapse; font-size: 16.5px; line-height: 1.45; }
.mech caption { caption-side: bottom; text-align: left; font-size: 15px; color: var(--ink-2); padding: 12px 18px 14px; border-top: 1px solid var(--rule); background: #fff; }
.mech th, .mech td { text-align: left; vertical-align: top; padding: 12px 18px; border-top: 1px solid var(--rule); }
.mech thead th { border-top: 0; background: var(--surface); font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--ink-3); padding-top: 10px; padding-bottom: 10px; }
.mech tbody th { font-weight: 500; width: 34%; }
.mech .observed-row th, .mech .observed-row td { background: var(--accent-wash); }
.tag { display: inline-block; font-family: var(--mono); font-size: 11.5px; font-weight: 600; line-height: 1; border-radius: 999px; padding: 4px 9px; margin-right: 6px; vertical-align: 1px; }
.tag.absent { color: var(--absent); background: var(--absent-wash); }
.tag.observed { color: var(--accent); background: #fff; border: 1px solid var(--accent); }

/* ---------- figure 2: real-run player ---------- */
.picker { display: flex; flex-wrap: wrap; gap: 8px; }
.pick {
  font: inherit; cursor: pointer; text-align: left; display: flex; flex-direction: column; gap: 1px; min-width: 0;
  background: #fff; color: var(--ink); border: 1px solid var(--rule-2); border-radius: 10px; padding: 7px 12px 8px;
}
.pick:hover { border-color: var(--ink-3); }
.pick b { font-size: 16px; font-weight: 600; line-height: 1.25; }
.pick small { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
.pick[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.pick[aria-selected="true"] small { color: rgba(255, 255, 255, 0.8); }

.run-head { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 14px 28px; margin: 22px 0 16px; align-items: start; }
.run-head h3 { margin: 0; font-size: 23px; line-height: 1.25; font-weight: 600; }
.run-head p { margin: 6px 0 0; font-size: 17px; line-height: 1.5; color: var(--ink-2); }
.run-meta { margin: 4px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; align-items: baseline; }
.run-meta dt { font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); }
.run-meta dd { margin: 0; font-size: 15.5px; font-weight: 500; }

.strip-box { background: #fff; border: 1px solid var(--rule-2); border-radius: var(--radius); padding: 12px 14px 14px; }
.strip-top { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 4px 16px; margin-bottom: 10px; }
.strip-title { margin: 0; font-family: var(--mono); font-size: 12px; font-weight: 600; }
.strip-sum { margin: 0; font-size: 15.5px; font-style: italic; color: var(--ink-2); }
.strip { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 5px; }
.strip button {
  position: relative; width: 100%; height: 32px; cursor: pointer;
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  background: #fff; color: var(--ink-2); border: 1px solid var(--rule-2); border-radius: 6px;
}
.strip button:hover { border-color: var(--ink-3); }
.strip button[aria-current="true"] { outline: 2px solid var(--ink); outline-offset: 2px; }
.strip button[aria-current="true"]::after {
  content: ""; position: absolute; left: 50%; bottom: -9px; transform: translateX(-50%);
  width: 5px; height: 5px; border-radius: 50%; background: var(--ink);
}
.s-warm { background: var(--rev-wash) !important; border-color: var(--rev-line) !important; color: var(--rev) !important; }
.s-favor { background: #cfe0fd !important; border-color: var(--c-favor) !important; color: #173c80 !important; }
.s-harm { background: #f9ccda !important; border-color: var(--c-harm) !important; color: #7d1f40 !important; }
.s-approved { background: #fff !important; border: 1.5px dashed var(--c-favor) !important; color: var(--ink) !important; }
.s-refusal { background: #e9ebee !important; border-color: #9aa1a8 !important; color: var(--ink) !important; }
.s-none { background: #fff !important; }
.strip-legend { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 16px; font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); }
.tile-sw { display: inline-block; width: 13px; height: 11px; border: 1px solid var(--rule-2); border-radius: 3px; margin-right: 6px; vertical-align: -1px; }

.stage { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 14px; margin-top: 14px; }
.player figcaption .source code { font-size: 0.85em; overflow-wrap: anywhere; }

/* ---------- figure 3: results chart ---------- */
.chart-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.mgrid { display: grid; grid-template-columns: 160px repeat(3, minmax(0, 1fr)); gap: 0 24px; margin-top: 18px; background: #fff; border: 1px solid var(--rule-2); border-radius: var(--radius); padding: 6px 18px 4px; }
.mhead { align-self: end; padding: 10px 0 8px; border-bottom: 1px solid var(--rule-2); font-family: var(--mono); font-size: 12px; line-height: 1.4; color: var(--ink-2); }
.mhead b { color: var(--ink); font-weight: 600; }
.mname { display: flex; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--rule); font-size: 17px; font-weight: 500; line-height: 1.25; }
.mcell { padding: 13px 0; border-bottom: 1px solid var(--rule); }
.mname:nth-last-child(4), .mcell:nth-last-child(-n+3) { border-bottom: 0; }
.mcell .mini { display: none; font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); margin-bottom: 4px; }
.bar { position: relative; height: 22px; outline-offset: 4px; }
.bar .track { position: absolute; left: 0; right: 54px; top: 10px; height: 2px; background: #eceef0; }
.bar .plot { position: absolute; top: 0; bottom: 0; left: 0; right: 54px; }
.bar .fill { position: absolute; left: 0; top: 5px; height: 12px; border-radius: 0 4px 4px 0; transition: width 0.5s cubic-bezier(.2,.7,.2,1); }
.bar .fill.favor { background: var(--c-favor); }
.bar .fill.harm { background: var(--c-harm); }
.bar .ci { position: absolute; top: 10px; height: 1.5px; background: var(--ink); opacity: 0.6; transition: left 0.5s, width 0.5s; }
.bar .ci::before, .bar .ci::after { content: ""; position: absolute; top: -4px; width: 1.5px; height: 9.5px; background: inherit; }
.bar .ci::before { left: 0; }
.bar .ci::after { right: 0; }
.bar .val { position: absolute; right: 0; top: 0; width: 48px; text-align: right; line-height: 22px; font-family: var(--mono); font-size: 12.5px; font-weight: 500; font-variant-numeric: tabular-nums; }

.readings { margin: 28px 0 0; padding-left: 22px; }
.readings li { margin: 0 0 10px; padding-left: 4px; }
.readings li::marker { color: var(--accent); }

/* ---------- BibTeX ---------- */
.bib { position: relative; max-width: 760px; background: var(--surface); border: 1px solid var(--rule); border-radius: 14px; }
.bib pre { margin: 0; padding: 18px 20px; overflow-x: auto; font-size: 13px; line-height: 1.6; }
.copy {
  position: absolute; top: 10px; right: 10px; cursor: pointer;
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  background: #fff; border: 1px solid var(--accent); border-radius: 999px; padding: 4px 12px;
}
.copy:hover { background: var(--accent-wash); }

/* ---------- footer ---------- */
.footer {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 6px;
  margin-top: 96px; padding-top: 22px; padding-bottom: 48px;
  font-family: var(--mono); font-size: 12px; color: var(--ink-3);
  background: linear-gradient(var(--rule), var(--rule)) top / calc(100% - 56px) 1px no-repeat;
}

/* ---------- tooltip ---------- */
.tip {
  position: fixed; z-index: 50; pointer-events: none; max-width: 260px;
  background: #fff; color: var(--ink); border: 1px solid var(--rule-2); border-radius: 8px;
  font-family: var(--mono); font-size: 12px; line-height: 1.45; padding: 6px 9px;
  box-shadow: 0 6px 20px -8px rgba(0, 0, 0, 0.25);
}

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .scene-grid, .stage { grid-template-columns: minmax(0, 1fr); }
  .channel { min-height: 0; }
  .run-head { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 760px) {
  .mgrid { grid-template-columns: minmax(0, 1fr); padding: 4px 14px; }
  .mhead { display: none; }
  .mname { border-bottom: 0; padding: 16px 0 2px; }
  .mcell { border-bottom: 0; padding: 6px 0; }
  .mcell.last { border-bottom: 1px solid var(--rule); padding-bottom: 14px; }
  .mcell.last:nth-last-child(1) { border-bottom: 0; }
  .mcell .mini { display: block; }
}
@media (max-width: 520px) {
  body { font-size: 17px; }
  .shell { padding: 0 16px; }
  .band { padding-top: 24px; padding-bottom: 120px; }
  .overlap { margin-top: -96px; }
  .logo { margin-bottom: 32px; }
  .logo img { height: 38px; }
  .fig { padding: 12px; border-radius: 12px; }
  .sec h2 { font-size: 26px; }
  .channel { padding: 10px 10px 14px; }
  .msg { grid-template-columns: 26px minmax(0, 1fr); gap: 7px; }
  .msg.right { grid-template-columns: minmax(0, 1fr) 26px; }
  .av { width: 26px; height: 26px; }
  .bubble { font-size: 15.5px; }
  .code { font-size: 12px; }
  .pick { flex: 1 1 calc(50% - 8px); }
  .strip { grid-template-columns: repeat(6, minmax(0, 1fr)); row-gap: 12px; }
  .mech th, .mech td { padding: 10px 12px; }
  .mech tbody th { width: 38%; }
  .footer { background-size: calc(100% - 32px) 1px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}