/* bkm: the BKM wall. The noticeboard of cohort (Avi, 2026-10-26), in
   English: cork, pins, Polaroids for the BKMs, paper for the steps, sticky
   notes for the conversation. One look, light only: a noticeboard is a
   physical thing, and every colour below is set explicitly. Built for a
   computer (REQ-B.4); a phone gets a notice, not a layout. */

:root {
  --cork: #c4955f;
  --wood: #5b3c22;
  --wood-dark: #3f2915;
  --paper: #ffffff;
  --ink: #2b2118;
  --ink-soft: #6b5643;
  --note: #ffe97a;
  --note-pink: #ffd0dc;
  --red: #c8102e;
  --blue: #1458b8;
  --green: #2f8a1f;
  --f-marker: "Permanent Marker", "Comic Sans MS", cursive;
  --f-body: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  --f-mono: "JetBrains Mono", Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.bm {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  color: var(--ink); font-family: var(--f-body); font-size: 17px; line-height: 1.55;
  background-color: var(--cork);
  background-image:
    radial-gradient(rgba(90, 55, 25, .32) 1px, transparent 1.6px),
    radial-gradient(rgba(255, 235, 200, .22) 1px, transparent 1.6px);
  background-size: 7px 7px, 11px 11px;
  background-position: 0 0, 3px 4px;
}
a { color: var(--blue); }
img { max-width: 100%; height: auto; display: block; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
[hidden] { display: none !important; }

/* ---- the frame ---- */
/* Fixed, not sticky (Avi, 2026-10-27: the menu must always be there when
   scrolling). The page is pushed down by the bar's real height, measured by
   bkm.js into --bm-bar-h; 66px until then. */
body.bm { padding-top: var(--bm-bar-h, 66px); }
.bm-bar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 30;
  display: flex; align-items: center; gap: 8px 28px; flex-wrap: wrap;
  padding: calc(10px + env(safe-area-inset-top, 0px)) 28px 10px;
  background: var(--wood); color: #fbefdc; border-bottom: 5px solid var(--wood-dark);
  box-shadow: 0 3px 8px rgba(0, 0, 0, .25);
}
.bm-brand { display: inline-flex; align-items: center; gap: 10px; color: #fff8ec; text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.bm-brand-mark { font-family: var(--f-marker); font-size: 1.5rem; line-height: 1; background: var(--note); color: var(--ink); padding: 4px 8px 2px; transform: rotate(-3deg); box-shadow: 0 2px 4px rgba(0,0,0,.3); }
.bm-nav { display: flex; gap: 4px 20px; }
.bm-nav a { color: #f1dfc3; text-decoration: none; font-weight: 600; min-height: 40px; display: inline-flex; align-items: center; }
.bm-nav a[aria-current="page"] { color: #fff; box-shadow: inset 0 -3px 0 var(--note); }
.bm-account { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.bm-who { color: #f1dfc3; font-size: .95rem; }
.bm-link { background: none; border: 0; padding: 0; font: inherit; color: inherit; text-decoration: underline; cursor: pointer; min-height: 36px; }
.bm-bar .bm-link { color: #f1dfc3; }

.bm-main { width: 100%; max-width: 1240px; margin: 0 auto; padding-inline: 28px; padding-block: 30px 60px; flex: 1; }
.bm-foot { text-align: center; color: #fff8ec; font-size: .85rem; padding: 14px 16px 22px; text-shadow: 0 1px 0 rgba(0,0,0,.3); }
.bm-flash p { margin: 0 0 16px; padding: 10px 14px; background: var(--note); box-shadow: 0 3px 6px rgba(0,0,0,.2); display: inline-block; }

/* ---- type ---- */
.bm-title { font-family: var(--f-marker); font-weight: 400; font-size: 2.9rem; line-height: 1.05; margin: 0 0 10px; color: var(--ink); text-wrap: balance; }
.bm-head .bm-title { color: #fff8ec; text-shadow: 0 2px 0 rgba(0,0,0,.25); }
.bm-head .bm-lede { color: #fff8ec; }
.bm-h1 { font-family: var(--f-marker); font-weight: 400; font-size: 2.1rem; line-height: 1.1; margin: 0 0 10px; }
.bm-lede { font-size: 1.15rem; max-width: 62ch; margin: 0 0 14px; }
.bm-muted { color: var(--ink-soft); }
.bm-small { font-size: .9rem; overflow-wrap: anywhere; }
.bm-error { color: var(--red); display: block; margin: 0; }
.bm-back { margin: 0 0 14px; }
.bm-back a { color: #fff8ec; font-weight: 600; }
code { font-family: var(--f-mono); font-size: .9em; background: #f3ece0; padding: 1px 5px; border-radius: 3px; }

/* ---- buttons ---- */
.bm-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 44px; padding: 0 20px; border: 0; border-radius: 3px;
  background: var(--note); color: var(--ink); font: inherit; font-weight: 700;
  text-decoration: none; cursor: pointer; box-shadow: 0 3px 6px rgba(0, 0, 0, .25);
}
.bm-btn:hover { filter: brightness(1.04); }
.bm-btn-small { min-height: 38px; padding: 0 14px; font-size: .95rem; }
.bm-btn-quiet { background: #f6f1e7; }
.bm-google { background: var(--paper); border: 1px solid #d8cdbb; width: 100%; min-height: 50px; font-size: 1.05rem; }
.bm-google svg { width: 20px; height: 20px; }

/* ---- paper and pins ---- */
.bm-paper { position: relative; background: var(--paper); padding: 26px 26px 22px; box-shadow: 0 6px 14px rgba(0, 0, 0, .28); }
.bm-pin {
  position: absolute; top: -9px; left: 50%; width: 18px; height: 18px; margin-left: -9px; border-radius: 50%; z-index: 2;
  background: radial-gradient(circle at 35% 35%, #ff8c8c, var(--red) 70%); box-shadow: 0 3px 4px rgba(0, 0, 0, .35);
}
.bm-card:nth-child(3n+2) .bm-pin { background: radial-gradient(circle at 35% 35%, #8fc3ff, var(--blue) 70%); }
.bm-card:nth-child(3n) .bm-pin { background: radial-gradient(circle at 35% 35%, #b4f0a0, var(--green) 70%); }

/* ---- the message on top (REQ-B.1) ---- */
.bm-intro { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 28px; align-items: start; margin-bottom: 44px; }
.bm-intro-paper { transform: rotate(-.4deg); padding: 32px 36px 26px; }
.bm-steps { margin: 6px 0 0; padding: 0; list-style: none; counter-reset: step; display: grid; gap: 10px; }
.bm-steps li { counter-increment: step; position: relative; padding-left: 46px; min-height: 34px; min-width: 0; }
.bm-steps li::before {
  content: counter(step); position: absolute; left: 0; top: -2px; width: 32px; height: 32px; border-radius: 50%;
  display: grid; place-items: center; font-family: var(--f-marker); font-size: 1.1rem; background: var(--note); box-shadow: 0 2px 3px rgba(0,0,0,.25);
}
.bm-intro .bm-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 30px; }
.bm-note { background: var(--note); padding: 14px 16px; box-shadow: 0 4px 8px rgba(0, 0, 0, .22); }
.bm-intro .bm-note { transform: rotate(3deg); margin-top: 30px; font-family: var(--f-marker); font-size: 1.15rem; line-height: 1.35; }
.bm-intro .bm-note p { margin: 0; }

/* ---- the wall: Polaroids ---- */
.bm-wall { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 40px 34px; }
.bm-card {
  position: relative; display: flex; flex-direction: column; gap: 10px; min-width: 0;
  background: var(--paper); padding: 14px 14px 10px; box-shadow: 0 6px 14px rgba(0, 0, 0, .28);
  scroll-margin-top: 100px;
}
.bm-wall .bm-card:nth-child(4n+1) { transform: rotate(1deg); }
.bm-wall .bm-card:nth-child(4n+2) { transform: rotate(-1.1deg); }
.bm-wall .bm-card:nth-child(4n+3) { transform: rotate(.5deg); }
.bm-wall .bm-card:nth-child(4n) { transform: rotate(-.6deg); }
@media (prefers-reduced-motion: no-preference) {
  .bm-wall .bm-card { transition: transform .18s ease, box-shadow .18s ease; }
  .bm-wall .bm-card:hover { transform: rotate(0) translateY(-3px); box-shadow: 0 12px 24px rgba(0, 0, 0, .3); }
}
.bm-card:target { outline: 4px solid var(--note); outline-offset: 4px; }
.bm-card.is-hidden { opacity: .6; }
.bm-card-pic { display: block; aspect-ratio: 4 / 3; max-width: 100%; background: #efe7da; overflow: hidden; }
.bm-card-pic img { width: 100%; height: 100%; object-fit: cover; }
.bm-card-nopic { display: grid; place-items: center; height: 100%; font-family: var(--f-marker); font-size: 1.6rem; color: var(--ink-soft); }
.bm-card-text { display: grid; gap: 2px; padding: 0 4px; }
.bm-card-name { margin: 0; font-family: var(--f-marker); font-weight: 400; font-size: 1.55rem; line-height: 1.15; overflow-wrap: anywhere; }
.bm-card-name a { color: var(--ink); text-decoration: none; }
.bm-card-name a:hover { text-decoration: underline; }
.bm-card-line { margin: 0; color: var(--ink-soft); font-size: .98rem; }
.bm-hidden-tag { margin: 4px 0 0; font-size: .82rem; font-weight: 700; color: var(--red); }
.bm-card-acts { display: flex; align-items: center; gap: 2px; margin-top: auto; padding-top: 6px; border-top: 1px dashed #e2d6c2; }
.bm-act {
  display: inline-flex; align-items: center; gap: 5px; min-height: 40px; min-width: 40px; padding: 0 8px;
  background: none; border: 0; border-radius: 4px; font: inherit; font-size: .95rem; color: var(--ink-soft); cursor: pointer; text-decoration: none;
  font-variant-numeric: tabular-nums;
}
.bm-act:hover { background: rgba(0, 0, 0, .05); color: var(--ink); }
.bm-act svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; }
.bm-count { min-width: 1ch; font-weight: 600; }
.bm-like[aria-pressed="true"] { color: var(--red); }
.bm-like[aria-pressed="true"] svg { fill: var(--red); stroke: var(--red); }
.bm-star[aria-pressed="true"] { color: #b88a00; }
.bm-star[aria-pressed="true"] svg { fill: #f2c200; stroke: #b88a00; }
.bm-start {
  margin-left: auto; min-height: 40px; display: inline-flex; align-items: center; padding: 0 6px;
  background: none; border: 0; font: inherit; font-weight: 700; font-size: .95rem; color: var(--blue); cursor: pointer; text-decoration: underline;
}
.bm-empty { max-width: 560px; display: grid; gap: 12px; justify-items: start; }
.bm-empty p { margin: 0; }

/* ---- one BKM ---- */
.bm-detail { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 36px; align-items: start; margin-bottom: 44px; }
.bm-card-big { transform: rotate(-.6deg); }
.bm-card-big .bm-card-name { font-size: 2rem; }
.bm-card-big .bm-card-acts { gap: 8px; flex-wrap: wrap; }
.bm-card-big .bm-btn { margin-left: auto; }
.bm-start-paper { transform: rotate(.4deg); }
.bm-start-paper h2 { font-family: var(--f-marker); font-weight: 400; font-size: 1.7rem; margin: 0 0 12px; }
.bm-start-paper .bm-steps { gap: 16px; }
.bm-cmd { display: flex; align-items: center; gap: 8px; margin: 6px 0 4px; }
.bm-cmd code { flex: 1; min-width: 0; overflow-x: auto; white-space: nowrap; display: block; padding: 8px 10px; background: #2b2118; color: #ffe9b0; border-radius: 3px; }
.bm-copy { min-height: 36px; padding: 0 12px; border: 1px solid #d8cdbb; border-radius: 3px; background: #f6f1e7; font: inherit; font-size: .88rem; font-weight: 600; cursor: pointer; }
.bm-copy.is-done { background: #dff0d8; border-color: var(--green); }

/* ---- the conversation: sticky notes ---- */
.bm-thread { max-width: 780px; display: grid; gap: 16px; scroll-margin-top: 90px; }
.bm-thread-title { font-family: var(--f-marker); font-weight: 400; font-size: 2rem; margin: 0; color: #fff8ec; text-shadow: 0 2px 0 rgba(0,0,0,.25); }
.bm-thread-empty { margin: 0; color: #fff8ec; font-size: 1.05rem; }
.bm-thread .bm-note { scroll-margin-top: 100px; }
.bm-thread .bm-note:nth-of-type(even) { background: var(--note-pink); transform: rotate(-.4deg); }
.bm-note:target { outline: 3px solid var(--blue); }
.bm-note.is-deleted { background: rgba(255, 255, 255, .7) !important; }
.bm-note-head { margin: 0 0 4px; }
.bm-note-body { margin: 0; overflow-wrap: anywhere; }
.bm-note-acts { display: flex; align-items: flex-start; gap: 18px; margin-top: 4px; font-size: .92rem; color: var(--ink-soft); }
.bm-note-acts .bm-link { color: var(--ink-soft); }
.bm-edit summary { list-style: none; display: inline-flex; align-items: center; min-height: 36px; }
.bm-edit summary::-webkit-details-marker { display: none; }
.bm-edit[open] { flex-basis: 100%; }
.bm-inline { margin: 0; }
.bm-quote { display: block; background: rgba(255, 255, 255, .6); border-left: 3px solid var(--ink-soft); padding: 4px 10px; margin-bottom: 8px; font-size: .9rem; color: var(--ink); text-decoration: none; overflow-wrap: anywhere; }
.bm-quote b { display: block; font-size: .82rem; color: var(--ink-soft); }
.bm-note-new { background: var(--paper) !important; transform: none !important; }
.bm-replying { display: flex; justify-content: space-between; align-items: center; gap: 10px; background: #f5efe2; padding: 4px 10px; font-size: .92rem; }

/* ---- the exhibition (REQ-B.30 to B.35): photos taped, not pinned ---- */
.bm-phead { display: flex; align-items: flex-end; justify-content: space-between; gap: 14px 24px; flex-wrap: wrap; margin-bottom: 20px; }
.bm-title-light { color: #fff8ec; text-shadow: 0 2px 0 rgba(0,0,0,.25); }
.bm-lede-light { color: #fff8ec; margin: 0; text-shadow: 0 1px 0 rgba(0,0,0,.3); }
.bm-filters {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 14px;
  background: rgba(255, 248, 236, .92); padding: 12px 14px; box-shadow: 0 4px 10px rgba(0,0,0,.2);
}
.bm-filters select { flex: 0 1 auto; }
.bm-search { flex: 1 1 200px; min-width: 0; display: flex; align-items: center; gap: 8px; background: var(--paper); border: 1px solid #b9a88f; border-radius: 3px; padding: 0 10px; }
.bm-search svg { width: 18px; height: 18px; flex: none; fill: none; stroke: var(--ink-soft); stroke-width: 2; stroke-linecap: round; }
.bm-search input { flex: 1; min-width: 0; border: 0; background: none; font: inherit; min-height: 42px; color: var(--ink); outline: none; }
.bm-filters select { font: inherit; font-size: 16px; min-height: 42px; padding: 0 8px; border: 1px solid #b9a88f; border-radius: 3px; background: var(--paper); color: var(--ink); max-width: 100%; }
.bm-clear { color: #fff8ec; font-weight: 600; }
.bm-found { margin: 0 0 18px; color: #fff8ec; font-weight: 600; text-shadow: 0 1px 0 rgba(0,0,0,.3); }
.bm-exhibit { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr)); gap: 40px 30px; align-items: start; }
.bm-pcard {
  position: relative; display: flex; flex-direction: column; gap: 8px; min-width: 0;
  background: var(--paper); padding: 12px 12px 8px; box-shadow: 0 6px 14px rgba(0, 0, 0, .28); scroll-margin-top: 100px;
}
.bm-exhibit .bm-pcard:nth-child(3n+1) { transform: rotate(-.8deg); }
.bm-exhibit .bm-pcard:nth-child(3n+2) { transform: rotate(.6deg); }
.bm-pcard:target { outline: 4px solid var(--note); outline-offset: 4px; }
.bm-tape {
  position: absolute; top: -12px; left: 50%; width: 92px; height: 26px; margin-left: -46px; z-index: 2;
  background: rgba(255, 233, 122, .75); box-shadow: 0 1px 2px rgba(0,0,0,.15); transform: rotate(-3deg);
}
.bm-pcard:nth-child(even) .bm-tape { background: rgba(255, 208, 220, .8); transform: rotate(2deg); }
.bm-pmedia { position: relative; aspect-ratio: 16 / 10; max-width: 100%; background: #2b2118; overflow: hidden; }
.bm-pmedia-btn { display: block; width: 100%; height: 100%; padding: 0; border: 0; background: #efe7da; cursor: pointer; position: relative; }
.bm-pmedia-btn img { width: 100%; height: 100%; object-fit: cover; }
.bm-play { position: absolute; inset: 0; display: grid; place-items: center; }
.bm-play svg { width: 54px; height: 54px; padding: 10px 8px 10px 13px; border-radius: 14px; background: rgba(200, 16, 46, .92); fill: #fff; box-shadow: 0 3px 8px rgba(0,0,0,.35); }
.bm-site-tag { position: absolute; left: 8px; bottom: 8px; max-width: calc(100% - 16px); padding: 2px 8px; background: rgba(43, 33, 24, .82); color: #fff8ec; font-size: .8rem; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.bm-video { width: 100%; height: 100%; background: #000; }
.bm-video iframe { width: 100%; height: 100%; border: 0; display: block; }
.bm-video:fullscreen iframe { width: 100vw; height: 100vh; }
.bm-ptext { display: grid; gap: 4px; padding: 0 2px; min-width: 0; }
.bm-ptitle { margin: 0; font-size: 1.15rem; line-height: 1.25; overflow-wrap: anywhere; }
.bm-ptitle a, .bm-linklike { color: var(--ink); text-decoration: none; }
.bm-ptitle a:hover, .bm-linklike:hover { text-decoration: underline; }
.bm-linklike { background: none; border: 0; padding: 0; font: inherit; font-weight: inherit; text-align: left; cursor: pointer; }
.bm-pby { margin: 0; color: var(--ink-soft); font-size: .88rem; }
.bm-pdesc { margin: 0; font-size: .95rem; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.bm-chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 0; }
.bm-chip { display: inline-flex; align-items: center; min-height: 26px; padding: 0 9px; border-radius: 999px; background: #f3ece0; color: var(--ink); font-size: .8rem; font-weight: 600; text-decoration: none; }
.bm-chip:hover { background: #e9dfcd; }
.bm-chip-bkm { background: var(--note); }
.bm-chip-tag { background: none; color: var(--blue); padding: 0 4px; }
.bm-made { margin: 10px 0 0; font-weight: 600; }
.bm-pdetail { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 36px; align-items: start; margin: 10px 0 44px; }
.bm-pcard-big { transform: rotate(-.3deg); }
.bm-pcard-big .bm-card-acts { flex-wrap: wrap; gap: 8px; }
.bm-pcard-big .bm-btn { margin-left: auto; }
.bm-pabout { display: grid; gap: 10px; }
.bm-pabout p, .bm-pabout .bm-h1 { margin: 0; }
.bm-facts { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px 14px; margin: 4px 0 0; }
.bm-facts dt { font-weight: 700; color: var(--ink-soft); }
.bm-facts dd { margin: 0; min-width: 0; }
.bm-zoom { border: 0; padding: 0; background: none; max-width: calc(100vw - 32px); max-height: calc(100vh - 32px); overflow: visible; }
.bm-zoom::backdrop { background: rgba(20, 12, 5, .85); }
.bm-zoom img { max-width: calc(100vw - 32px); max-height: calc(100vh - 32px); box-shadow: 0 10px 30px rgba(0,0,0,.5); }
.bm-zoom .bm-gate-close { background: var(--paper); border-radius: 50%; top: -14px; right: -14px; box-shadow: 0 2px 6px rgba(0,0,0,.3); }
.bm-form-paper { max-width: 720px; display: grid; gap: 12px; }
.bm-form-paper .bm-h1, .bm-form-paper > p { margin: 0; }
.bm-kinds { border: 0; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.bm-kinds legend { font-weight: 600; margin-bottom: 6px; }
.bm-kind { display: flex; align-items: center; gap: 8px; min-height: 52px; padding: 0 12px; border: 2px solid #d8cdbb; border-radius: 4px; cursor: pointer; font-weight: 600; background: #fffdf8; }
.bm-kind:has(input:checked) { border-color: var(--ink); background: var(--note); }
.bm-field select { font: inherit; font-weight: 400; width: 100%; min-height: 44px; padding: 8px 10px; border: 1px solid #b9a88f; border-radius: 3px; background: #fffdf8; color: var(--ink); }
.bm-upload { position: relative; display: inline-flex; justify-self: start; cursor: pointer; }
.bm-upload input { position: absolute; inset: 0; width: 100%; opacity: 0; cursor: pointer; }
.bm-upload-name { font-weight: 600; color: var(--green); }
.bm-remove { margin: 4px 0 0; }
.bm-rot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.bm-rot-box { width: 240px; height: 240px; max-width: 100%; display: grid; place-items: center; background: #efe7da; border: 1px solid #d8cdbb; overflow: hidden; }
.bm-rot-box img { max-width: 100%; max-height: 100%; object-fit: contain; transition: transform .2s ease; }
.bm-rot-btns { display: grid; gap: 8px; }
.bm-rot-btns svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.bm-form-pic { width: 260px; max-width: 100%; aspect-ratio: 4 / 3; object-fit: cover; box-shadow: 0 3px 8px rgba(0,0,0,.25); }
.bm-check { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; min-height: 44px; cursor: pointer; }
.bm-check input { width: 22px; height: 22px; }
.bm-admin-edit { font-size: .85rem; font-weight: 700; color: var(--red); }
.bm-admin-bar { display: flex; justify-content: flex-end; margin: -24px 0 18px; }
.bm-danger { color: var(--red); }

/* ---- forms ---- */
.bm-form { display: grid; gap: 12px; }
.bm-field { display: grid; gap: 4px; font-weight: 600; }
.bm-field input, .bm-field textarea, .bm-form textarea {
  font: inherit; font-weight: 400; width: 100%; min-height: 44px; padding: 8px 10px;
  border: 1px solid #b9a88f; border-radius: 3px; background: #fffdf8; color: var(--ink);
}
.bm-door { display: grid; place-items: start center; padding-top: 30px; }
.bm-door-paper { width: 100%; max-width: 480px; display: grid; gap: 14px; }
.bm-door-paper p, .bm-door-paper .bm-h1 { margin: 0; }

/* ---- the sign-in window (REQ-B.3) ---- */
.bm-gate { border: 0; padding: 0; background: none; max-width: min(460px, calc(100% - 32px)); width: 100%; overflow: visible; }
.bm-gate::backdrop { background: rgba(40, 25, 10, .55); }
.bm-gate-paper { display: grid; gap: 14px; padding: 34px 30px 26px; }
.bm-gate-paper h2 { font-family: var(--f-marker); font-weight: 400; font-size: 1.9rem; margin: 0; }
.bm-gate-paper p { margin: 0; }
.bm-gate-close { position: absolute; top: 8px; right: 8px; width: 40px; height: 40px; display: grid; place-items: center; border: 0; background: none; cursor: pointer; color: var(--ink-soft); }
.bm-gate-close svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 2; }
.bm-gate-more { font-size: .92rem; color: var(--ink-soft); }
.bm-gate-more summary { cursor: pointer; text-decoration: underline; min-height: 32px; display: inline-flex; align-items: center; }
.bm-gate-more[open] summary { margin-bottom: 10px; }
.bm-gate-more .bm-small { margin: 10px 0 0; }

/* ---- the phone notice (REQ-B.4) ---- */
.bm-phone { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 24px 16px; background: rgba(40, 25, 10, .8); }
.bm-phone-paper { max-width: 420px; display: grid; gap: 14px; text-align: center; justify-items: center; padding: 34px 22px 24px; }
.bm-phone-paper h2 { font-family: var(--f-marker); font-weight: 400; font-size: 1.8rem; line-height: 1.15; margin: 0; }
.bm-phone-paper p { margin: 0; }
.bm-phone-icon { width: 76px; height: 57px; fill: none; stroke: var(--ink); stroke-width: 2.5; stroke-linecap: round; }

/* A computer is the target; narrower screens only stack, nothing more. */
@media (max-width: 900px) {
  .bm-intro { grid-template-columns: 1fr; }
  .bm-intro .bm-note { display: none; }
  .bm-intro .bm-steps { grid-template-columns: 1fr; }
  .bm-detail, .bm-pdetail { grid-template-columns: minmax(0, 1fr); }
  .bm-kinds { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 600px) {
  .bm-bar { padding-inline: 16px; }
  .bm-main { padding-inline: 16px; }
  .bm-title { font-size: 2.2rem; }
  .bm-intro-paper { padding: 26px 20px 20px; }
}