/* SPDX-License-Identifier: Apache-2.0 */
/* Docs and guides kit. Loaded after styles.css by every page under /docs and /guides.
   styles.css still owns the site shell, tokens, .dgm basics, .dgm-key, callout boxes
   (.need .ok .note .warn-box), .steps, code blocks and copy buttons.

   Contents
     1. Article basics       .lead tone, .article-section, .section-lead, .article-kicker
     2. Cards                .cards > li (+ .card-ico, .is-optional)
     3. Steps                .steps .step-title
     4. Lists                .fix-list (+ --long), .fix-also, .who-list (station rows), .mark-list
     5. Flow                 .flow (A → B chips with a short condition between)
     6. Fitting              svg.dgm.fit, .pair (cards beside a diagram), table.stack-table
     7. Live diagram         .live-dgm figure, .setup-switch, .live-status, .setup-panel, .app-win
     8. Diagram glyphs       laptop, handheld radio, base station, house
     9. Packets              .seg + .pkt animation, .btn-replay
    10. App comparison       #apps-table (docs/apps.html) */

.page-panel {
  --body: #c8c0d8;
  --panel: #050509;
}

/* --- 1. article basics -------------------------------------------------- */

.page-panel .lead { color: var(--body); }
.page-panel .article-section { margin: 44px 0; }
.page-panel .article-section--first { margin-top: 24px; }
/* breathing room between blocks that follow each other inside a section */
.page-panel .article-section > p + p,
.page-panel .article-section > p + .table-wrap,
.page-panel .article-section > .table-wrap + p,
.page-panel .article-section > ol + p,
.page-panel .article-section > ul + p { margin-top: 10px; }
.page-panel .article-section > .live-dgm,
.page-panel .article-section > .pair { margin: 14px 0 18px; }
.page-panel .article-section > ol:not(.steps) { padding-left: 24px; }
.page-panel .article-section > ol:not(.steps) > li + li { margin-top: 4px; }
.page-panel .article-section > h2 {
  margin: 0 0 6px;
  font-size: 16px;
}
.page-panel .section-lead {
  margin: 0 0 16px;
  max-width: 46rem;
  font-size: 14px;
  line-height: 1.55;
  color: var(--body);
}
.page-panel .section-lead--after { margin: 12px 0 0; }
.page-panel .article-kicker {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--accent);
}

/* --- 2. cards ----------------------------------------------------------- */

.page-panel .cards {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin: 10px 0 0;
  padding: 0;
}
.page-panel .cards > li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 13px;
  line-height: 1.5;
  color: var(--body);
}
.page-panel .cards > li.is-optional { border-style: dashed; }
.page-panel .cards > li > strong {
  color: var(--fg);
  font-weight: 400;
}
/* compact cards: icon on the left, for a column of choices beside a diagram */
.page-panel .cards--compact { grid-template-columns: minmax(0, 1fr); gap: 8px; }
.page-panel .cards--compact > li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 2px;
  padding: 10px 12px;
}
.page-panel .cards--compact > li > .card-ico {
  grid-row: span 2;
  margin: 0;
}
.card-ico {
  width: 26px;
  height: 26px;
  margin-bottom: 6px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.4;
  stroke-linejoin: round;
}
.is-optional .card-ico { stroke: var(--orange); }

/* --- 3. steps ----------------------------------------------------------- */

.page-panel .steps .step-title {
  display: block;
  margin: 3px 0 4px;
  font-size: inherit;
  font-weight: 400;
  color: var(--fg);
}
.page-panel .steps .step-title + p,
.page-panel .steps > li > p + p { margin-top: 0; }
.page-panel .steps > li > p { margin: 0 0 8px; }
.page-panel .steps > li > p:last-child { margin-bottom: 0; }

/* --- 4. fix list -------------------------------------------------------- */

.page-panel .fix-list {
  display: grid;
  gap: 8px;
  margin: 10px 0 12px;
}
.fix-list > div {
  display: grid;
  grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
  gap: 4px 16px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.fix-list dt {
  font-size: 13px;
  color: var(--orange);
}
.fix-list dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
}
.page-panel .fix-also li { color: var(--body); }
@media (max-width: 600px) {
  .fix-list > div { grid-template-columns: minmax(0, 1fr); }
}

/* who's who: one row per station, mode in its map colour */
.page-panel .who-list {
  display: grid;
  gap: 6px;
  margin: 10px 0 12px;
}
.who-list > div {
  display: grid;
  grid-template-columns: minmax(0, 7.5rem) minmax(0, 1fr);
  gap: 2px 12px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--who, var(--line));
  background: var(--panel);
  font-size: 12.5px;
  line-height: 1.5;
}
.who-list dt { color: var(--fg); }
.who-list dt small {
  display: block;
  font-size: 11px;
  color: var(--who, var(--dim));
}
.who-list dd { margin: 0; color: var(--body); }
.page-panel .who-list dd code { white-space: normal; }
.who-list .mode-internet { --who: var(--mode-internet); }
.who-list .mode-internet-radio { --who: var(--mode-internet-radio); }
.who-list .mode-radio { --who: var(--mode-radio); }
.who-list .mode-radio-plus { --who: var(--mode-radio-plus); }

/* long fixes (paragraphs, lists, commands): symptom on top, fix at full width */
.fix-list--long > div {
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 14px 16px;
}
.page-panel .fix-list--long dt { font-size: 14px; }
.page-panel .fix-list--long dd > p,
.page-panel .fix-list--long dd li {
  font-size: 14px;
  line-height: 1.6;
}
.fix-list--long dd > * + * { margin-top: 8px; }
.fix-list--long dd > :first-child { margin-top: 0; }
.fix-list--long dd > :last-child,
.fix-list--long dd .pre-wrap:last-child { margin-bottom: 0; }
.fix-list--long dd ul,
.fix-list--long dd ol {
  margin: 8px 0 0;
  padding-left: 18px;
}
.fix-list--long dd li + li { margin-top: 4px; }
.fix-list--long pre {
  padding-right: 64px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.fix-list > div[id] { scroll-margin-top: 72px; }
.fix-list > div:target { border-color: var(--orange); }
@media (max-width: 960px) {
  .fix-list--long pre { padding-right: 14px; }
  .page-panel .fix-list--long dt,
  .page-panel .fix-list--long dd > p,
  .page-panel .fix-list--long dd li {
    font-size: 15px;
    line-height: 1.55;
  }
}

/* mark list: a short code in a narrow column, its meaning beside it ([ok] → delivered) */
.page-panel .mark-list {
  display: grid;
  margin: 8px 0 12px;
}
.mark-list > div {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 12px;
  padding: 5px 0;
  border-bottom: 1px solid rgba(125, 155, 255, 0.12);
}
.mark-list > div:last-child { border-bottom: 0; }
.mark-list dt,
.mark-list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--fg);
}
@media (max-width: 960px) {
  .mark-list dt,
  .mark-list dd { font-size: 16px; }
  .mark-list > div { grid-template-columns: 4rem minmax(0, 1fr); gap: 10px; }
}

/* --- 5. flow ------------------------------------------------------------ */

.flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  margin: 10px 0 14px;
}
/* three chips: A → B → C */
.flow--ladder {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
}
.flow--ladder .flow-step { max-width: 9rem; }
.flow-chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.35);
  font-size: 12px;
  color: var(--body);
}
.flow-chip svg {
  width: 78px;
  height: 16px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.6;
}
.flow-chip.is-start svg { stroke: var(--mode-internet-radio); }
.page-panel .flow-chip code {
  align-self: flex-start;
  font-size: 13px;
}
.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 11px;
  color: var(--dim);
  text-align: center;
}
.flow-step__arrow {
  font-size: 16px;
  color: var(--mode-internet-radio);
}
.flow-step__back { color: var(--orange); }
@media (max-width: 600px) {
  .flow,
  .flow--ladder { grid-template-columns: minmax(0, 1fr); }
  .flow--ladder .flow-step { max-width: none; }
  .flow-step__arrow { transform: rotate(90deg); }
}

/* --- 6. diagrams that fit a phone, and cards beside a diagram ----------- */

/* A static diagram drawn ~420–440 wide: add "fit" to the svg to skip the shared 620px scroll width. */
svg.dgm.fit {
  min-width: 0;
  max-width: 520px;
  margin: 0 auto;
}
svg.dgm.fit .sub { font-size: 11px; }

/* .pair: a column of cards (or text) beside a diagram; stacks on phones. */
.page-panel .pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 440px);
  gap: 18px;
  align-items: start;
  margin-top: 10px;
}
.page-panel .pair > figure.diagram,
.page-panel .pair > .article-section { margin: 0; }
.page-panel .pair > div > p + p { margin-top: 10px; }
.page-panel .pair .cards {
  grid-template-columns: minmax(0, 1fr);
  margin-top: 0;
}
@media (max-width: 760px) {
  .page-panel .pair { grid-template-columns: minmax(0, 1fr); }
}

/* A reference table whose rows stack on phones (cell above cell). */
@media (max-width: 600px) {
  .stack-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }
  .stack-table tr {
    display: block;
    padding: 8px 0;
    border-bottom: 1px solid rgba(125, 155, 255, 0.12);
  }
  .stack-table td {
    display: block;
    padding: 2px 4px;
    border: 0;
  }
  .stack-table td:first-child code { white-space: nowrap; }
}

/* --- 7. live diagram ---------------------------------------------------- */
/* <figure class="diagram live-dgm" data-live-dgm data-setup="…"> … see live-dgm.js */

.page-panel .live-dgm { margin: 0; }
.setup-switch {
  display: flex;
  flex-wrap: wrap;
  width: fit-content;
  max-width: 100%;
  margin: 0 0 10px;
  border: 1px solid var(--line);
}
.setup-switch[hidden] { display: none; }
.setup-switch button {
  padding: 7px 12px;
  border: 0;
  border-right: 1px solid var(--line);
  background: none;
  color: var(--dim);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}
.setup-switch button:last-child { border-right: 0; }
.setup-switch button:hover { color: var(--orange); }
.setup-switch button[aria-pressed="true"] {
  background: rgba(125, 155, 255, 0.12);
  color: var(--accent);
}
.setup-switch button:focus-visible {
  outline: 1px solid var(--orange);
  outline-offset: -1px;
}

/* Picture beside its text on desktop; .live-dgm--wide puts the picture across the full width
   and the text under it (see the wide figure rules below). */
.live-dgm__body {
  display: grid;
  grid-template-columns: minmax(0, 440px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.live-dgm--wide .live-dgm__body { grid-template-columns: minmax(0, 1fr); }
@media (max-width: 760px) {
  .live-dgm__body { grid-template-columns: minmax(0, 1fr); }
}
/* Live diagrams are drawn to fit a phone, so skip the shared 620px scroll width. */
.live-dgm svg.dgm { min-width: 0; }

/* Two drawings of one diagram (data-layout on each svg): the wide one on desktop,
   the narrow one on phones. Both carry the same ids; live-dgm.js drives both. */
.live-dgm svg.dgm[data-layout="wide"] { display: none; }
.live-dgm svg.dgm[data-layout="narrow"] {
  max-width: 480px;
  margin: 0 auto;
}
@media (min-width: 761px) {
  .live-dgm svg.dgm[data-layout="wide"] { display: block; }
  .live-dgm svg.dgm[data-layout="narrow"] { display: none; }
}

/* Wide figure: a full-width picker, the picture across the column, then the chosen
   setup's text with its station list beside it. */
.setup-switch--fill {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  width: 100%;
  padding: 0 1px 1px 0;
  border: 0;
}
.setup-switch--fill button {
  margin: 0 -1px -1px 0;
  padding: 9px 10px;
  border: 1px solid var(--line);
  line-height: 1.3;
}
.setup-switch--fill button:last-child { border-right: 1px solid var(--line); }
.setup-switch--fill button[aria-pressed="true"] {
  position: relative;
  z-index: 1;
  border-color: var(--accent);
}
.live-dgm--wide .setup-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 20rem);
  gap: 0 28px;
  align-items: start;
}
.live-dgm--wide .setup-panel > h3 { grid-column: 1 / -1; }
.page-panel .live-dgm--wide .setup-panel > .who-list { margin: 0; }
@media (max-width: 760px) {
  .live-dgm--wide .setup-panel { grid-template-columns: minmax(0, 1fr); }
  .page-panel .live-dgm--wide .setup-panel > .who-list { margin-top: 4px; }
}

.live-status {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-top: 8px;
}
.page-panel .live-status__text {
  margin: 0;
  min-height: 2.8em;
  font-size: 12px;
  line-height: 1.4;
  color: var(--body);
}
.live-status .btn-replay { flex: none; }

.page-panel .setup-panel h3 {
  margin: 0 0 6px;
  font-size: inherit;
  color: var(--fg);
}
.page-panel .setup-panel p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.6;
}
.page-panel .setup-panel + .setup-panel { margin-top: 18px; }
.page-panel .setup-note { color: var(--body); }
/* With the script running, only the chosen setup's text shows. */
.live-dgm.has-switch .setup-panel:not(.is-active) { display: none; }
.live-dgm.has-switch .setup-panel + .setup-panel { margin-top: 0; }

/* Parts that belong to some setups only: data-setups="a b". Mark the ones that are not in
   the default setup with class="is-off" in the markup so the page reads right without script. */
.live-dgm [data-setups] { transition: opacity 0.35s ease; }
.live-dgm [data-setups].is-off {
  opacity: 0;
  visibility: hidden;
}

/* Text and boxes in live diagrams read a touch larger than the shared .dgm defaults. */
.live-dgm svg.dgm text { font-size: 12px; }
.live-dgm svg.dgm .sub { font-size: 11px; }
.live-dgm svg.dgm .on-rf { fill: var(--orange); }
svg.dgm .seg.is-live .wire,
svg.dgm .seg.is-live .rf,
svg.dgm .seg.is-live .net { stroke-width: 2.3; }
svg.dgm .is-on .box { transition: fill 0.3s ease; }
svg.dgm .is-on .box.accent { fill: rgba(125, 155, 255, 0.12); }
svg.dgm .is-on .box.orange,
svg.dgm .is-on .box.radio { fill: rgba(255, 122, 61, 0.12); }
svg.dgm .is-on .box.gw { fill: rgba(57, 255, 20, 0.11); }
svg.dgm .is-on .box.hub { fill: rgba(0, 229, 255, 0.1); }
svg.dgm .is-on .box.rplus { fill: rgba(255, 77, 255, 0.14); }

/* App window: the chat (or Email) part of the app, filled in as the diagram plays.
   <div class="app-win mode-radio-plus" data-setups="home"> with __bar, __side, __lines, __input.
   Lines and marks use data-show like the drawings; a .ticks row shows only its latest mark. */
.live-dgm .app-win.is-off { display: none; }
.app-win {
  --who: var(--line);
  margin-top: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 12px;
}
.app-win.mode-internet { --who: var(--mode-internet); }
.app-win.mode-internet-radio { --who: var(--mode-internet-radio); }
.app-win.mode-radio { --who: var(--mode-radio); }
.app-win.mode-radio-plus { --who: var(--mode-radio-plus); }
.page-panel .app-win__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 6px 10px;
  border-bottom: 1px solid var(--line);
  background: #08080d;
  font-size: 11px;
  color: var(--dim);
}
.app-win__bar b { font-weight: 400; color: var(--fg); }
.app-win__bar > span:last-child { margin-left: auto; }
.app-win__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--who);
}
.app-win__body {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  grid-template-areas: "side lines" "side input";
}
.page-panel .app-win__side {
  grid-area: side;
  list-style: none;
  margin: 0;
  padding: 8px 10px;
  border-right: 1px solid var(--line);
}
.page-panel .app-win__side li {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim);
}
.page-panel .app-win__side li.is-active { color: var(--accent); }
.page-panel .app-win__side li.app-win__label { margin-top: 8px; font-size: 11px; }
.page-panel .app-win__lines {
  grid-area: lines;
  list-style: none;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
  min-height: 8.4em;
  margin: 0;
  padding: 8px 10px;
}
.page-panel .app-win__lines li {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--fg);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.app-win time,
.app-win .ticks,
.app-win .mail-waiting,
.app-win .mail-dir { color: var(--dim); }
.app-win .nick { color: var(--accent); }
.app-win .nick.me { color: var(--orange); }
.app-win .via-rf { color: var(--orange); }
.app-win .via-inet { color: var(--accent); }
.app-win .ticks .tick-ok { color: var(--mode-internet-radio); }
.page-panel .app-win__input {
  grid-area: input;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 6px 10px 8px;
  border-top: 1px solid var(--line);
  font-size: 12px;
}
.app-win__sym { color: var(--accent); }
.app-win__field {
  flex: 1;
  min-width: 0;
  padding: 3px 8px;
  border: 1px solid var(--line);
  color: var(--dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.app-win__send {
  padding: 3px 12px;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.app-win__send--alt { border-color: var(--orange); color: var(--orange); }
@media (max-width: 600px) {
  .app-win__body { grid-template-columns: minmax(0, 1fr); grid-template-areas: "lines" "input"; }
  .page-panel .app-win__side { display: none; }
}
/* Email tab: .app-win--mail > .app-mail with __head, __tabs, __toast, __rows, __open, __compose,
   and __dlg (a confirm or progress box over the tab). Each part is a .slot of states. */
.app-win--mail { position: relative; }
.app-mail { display: grid; gap: 6px; padding: 8px 10px 10px; }
.page-panel .app-mail p { margin: 0; font-size: 12px; line-height: 1.5; white-space: pre-wrap; }
.app-mail__head b { font-weight: 400; color: var(--accent); }
.app-mail__head { color: var(--dim); }
.app-mail__tabs > span { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; }
.app-mail__tabs { min-height: 1.8em; }
.app-mail__tab { color: var(--dim); }
.app-mail__tab.is-cur { color: var(--fg); border-bottom: 1px solid var(--accent); }
.app-mail__tabs .app-win__send { margin-left: auto; padding: 1px 10px; }
.page-panel .app-mail__toast { min-height: 1.5em; color: var(--mode-internet-radio); }
.app-mail__rows { min-height: 1.6em; border-top: 1px solid var(--line); padding-top: 4px; }
.page-panel .app-mail__rows p { overflow-wrap: anywhere; }
.page-panel .app-mail__rows p.is-cur { background: rgba(125, 155, 255, 0.12); }
.app-mail__dim { color: var(--dim); }
.app-mail__acc { color: var(--accent); }
.app-mail__open { min-height: 5.4em; }
.app-mail__open > div,
.app-mail__dlg > div { display: flex; flex-direction: column; gap: 2px; }
.app-mail__dlg span { white-space: pre-wrap; }
.app-mail__compose > div {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 8px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding-top: 6px;
}
.app-mail__lbl { color: var(--dim); }
.app-mail__field {
  padding: 2px 8px;
  border: 1px solid var(--line);
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.app-mail__body { grid-column: 1 / -1; min-height: 6em; white-space: pre-wrap; }
.app-mail__text { margin-top: 4px; white-space: pre-wrap; color: var(--fg); }
.app-mail__btns { display: flex; gap: 8px; margin-top: 6px; }
.app-mail__compose .app-mail__btns { grid-column: 1 / -1; margin-top: 0; }
.app-mail__dlg > div {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(24rem, calc(100% - 24px));
  transform: translate(-50%, -50%);
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #08080d;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.6);
}
.app-mail__dlg > div:empty { display: none; }
.app-mail__dlg b { font-weight: 400; color: var(--fg); margin-bottom: 4px; }
.app-mail__bar {
  position: relative;
  display: block;
  height: 14px;
  margin: 4px 0;
  border: 1px solid var(--line);
}
.app-mail__bar i { position: absolute; inset: 0 auto 0 0; background: var(--mode-internet-radio); opacity: 0.75; transition: width 0.6s ease; }
.app-mail__bar em { position: relative; display: block; font-style: normal; font-size: 10px; line-height: 12px; text-align: center; color: var(--fg); }
.live-dgm.js-live .app-win [data-show]:not(.is-shown) { display: none; }
/* .slot: several items in one place; only the latest one shown stays (no script: the last). */
.slot > .is-shown:has(~ .is-shown) { display: none; }
.live-dgm:not(.js-live) .slot > :not(:last-child) { display: none; }
.app-win .ticks > .is-shown:has(~ .is-shown) { display: none; }
.live-dgm:not(.js-live) .app-win .ticks > :not(:last-child) { display: none; }
@media (prefers-reduced-motion: no-preference) {
  .live-dgm.js-live .app-win__lines > li.is-shown { animation: app-line-in 0.35s ease-out both; }
}
@keyframes app-line-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

/* --- 8. diagram glyphs -------------------------------------------------- */
/* Snippets live in docs/KIT.md. */

/* laptop: <rect class="box accent"> screen + <path class="laptop-base"> */
svg.dgm .laptop-base {
  fill: #0a0a12;
  stroke: var(--accent);
  stroke-width: 1;
}
/* screen lines that appear as the demo runs: class="scr" data-show="name" */
svg.dgm .scr {
  font-size: 11px;
  fill: var(--fg);
}
svg.dgm .scr-input,
svg.dgm .scr-dim { font-size: 11px; fill: var(--dim); }
svg.dgm .scr.ok { fill: var(--mode-internet-radio); }
.live-dgm.js-live svg.dgm [data-show] { opacity: 0; transition: opacity 0.3s ease; }
.live-dgm.js-live svg.dgm [data-show].is-shown { opacity: 1; }

/* sound through the air instead of a cable */
svg.dgm .wire.air { stroke-dasharray: 2 4; }

/* handheld radio / desk radio: body .box.orange, .antenna, .antenna-tip, .grille, .led */
svg.dgm .antenna {
  stroke: var(--orange);
  stroke-width: 2;
  stroke-linecap: round;
}
svg.dgm .antenna-tip { fill: var(--orange); }
svg.dgm .grille {
  fill: none;
  stroke: rgba(255, 122, 61, 0.45);
  stroke-width: 1.5;
}
svg.dgm .led {
  fill: #2a1710;
  stroke: rgba(255, 122, 61, 0.55);
  stroke-width: 1;
  transition: fill 0.15s ease;
}
svg.dgm .is-on .led {
  fill: #ff5a3d;
  filter: drop-shadow(0 0 5px #ff5a3d);
}

/* base station at home: .house outline + .mast with .mast-rung cross bars */
svg.dgm .house {
  fill: rgba(125, 155, 255, 0.03);
  stroke: rgba(125, 155, 255, 0.45);
  stroke-width: 1;
  stroke-linejoin: round;
}
svg.dgm .mast {
  fill: none;
  stroke: var(--orange);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
/* a column or area that groups stations (one dial, one room) */
svg.dgm .lane-bg {
  fill: rgba(125, 155, 255, 0.03);
  stroke: var(--line);
  stroke-dasharray: 3 5;
}

/* --- 9. packets --------------------------------------------------------- */
/* Animated packet on a diagram path.
   Markup: <g class="seg seg-rf|seg-net|seg-sound"><path …/><path class="pkt" …/></g>.
   Page script sets --len (path length) on each .pkt and adds .is-live to the
   .seg; --leg delays later hops, .is-rev runs the path backwards. */
svg.dgm .pkt {
  fill: none;
  stroke-width: 4.5;
  stroke-linecap: round;
  stroke-dasharray: 12 2000;
  stroke-dashoffset: 14;
  opacity: 0;
}
svg.dgm .seg-rf .pkt {
  stroke: #ffd6c4;
  filter: drop-shadow(0 0 4px var(--orange));
}
svg.dgm .seg-net .pkt {
  stroke: #ccfaff;
  filter: drop-shadow(0 0 4px var(--mode-internet));
}
svg.dgm .seg-sound .pkt {
  stroke: #dde4ff;
  filter: drop-shadow(0 0 4px var(--accent));
}
@media (prefers-reduced-motion: no-preference) {
  svg.dgm .seg.is-live .pkt {
    opacity: 1;
    animation: dgm-packet var(--pkt-dur, 0.9s) ease-in-out calc(var(--leg, 0) * var(--pkt-dur, 0.9s)) both;
  }
  svg.dgm .seg.is-live.is-rev .pkt { animation-direction: reverse; }
}
@keyframes dgm-packet {
  from { stroke-dashoffset: 14; }
  to { stroke-dashoffset: calc(-1px * var(--len, 200)); }
}

.btn-replay {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 11px;
  border: 1px solid var(--accent);
  background: #0a0a12;
  color: var(--accent);
  cursor: pointer;
}
.btn-replay:hover {
  border-color: var(--orange);
  color: var(--orange);
}

/* --- 10. app comparison (docs/apps.html) -------------------------------- */
/* Wide feature table; it scrolls sideways inside .table-wrap on phones. */

.page-panel #apps-table {
  min-width: 980px;
  line-height: 1.3;
}
.page-panel #apps-table th,
.page-panel #apps-table td {
  vertical-align: top;
  padding: 6px 8px;
  border-bottom: 1px solid rgba(125, 155, 255, 0.12);
}
.page-panel #apps-table tbody th {
  color: var(--fg);
  white-space: nowrap;
}
.page-panel #apps-table tr.cmp-wcr th { color: var(--orange); }
/* Let the panel shrink to the screen; the wide table scrolls in its own box. */
body.cmp-page .page-panel { min-width: 0; }

/* --- band plan (docs/band-plan.html, built by scripts/gen_band_plan.py) ---------
   .bp-band: name, a .bp-bar with .bp-tick marks placed by left:%, edges, .bp-spots chips.
   Colours: .bp-usb (USB/LSB data), .bp-fm, .bp-am, .bp-avoid (keep chat off).
   .bp-plan[data-bp-region] hides spots and bands with nothing for that region. */
.bp-usb { --c: var(--orange); }
.bp-fm { --c: var(--accent); }
.bp-am { --c: var(--mode-radio); }
.bp-avoid { --c: var(--emergency); }
.bp-key {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin: 14px 0 12px;
  font-size: 12px;
  color: var(--dim);
}
.bp-key > span::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 12px;
  margin-right: 6px;
  vertical-align: -1px;
  background: var(--c);
}
.bp-key > .bp-key__plain::before { display: none; }
.bp-key > .bp-band--free-key::before {
  width: 18px;
  background: repeating-linear-gradient(135deg, rgba(57, 255, 20, 0.22) 0 3px, transparent 3px 6px);
  border: 1px solid rgba(57, 255, 20, 0.45);
}
.bp-list { display: grid; gap: 18px; }
.bp-band {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  column-gap: 16px;
}
.bp-band > :not(.bp-band__name) { grid-column: 2; }
.page-panel .bp-band .bp-band__name { grid-row: 1 / span 4; flex-direction: column; gap: 2px; }
@media (max-width: 600px) {
  .bp-band { grid-template-columns: minmax(0, 1fr); }
  .bp-band > :not(.bp-band__name) { grid-column: 1; }
  .page-panel .bp-band .bp-band__name { grid-row: auto; flex-direction: row; gap: 10px; }
}
.page-panel .bp-band__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 4px;
  font-size: 13px;
}
.bp-band__name b { font-weight: 400; color: var(--fg); font-size: 14px; }
.bp-band__name span { color: var(--dim); font-size: 12px; }
.bp-bar {
  position: relative;
  height: 26px;
  border: 1px solid var(--line);
  background: rgba(125, 155, 255, 0.06);
}
.bp-band--free .bp-bar {
  border-color: rgba(57, 255, 20, 0.45);
  background: repeating-linear-gradient(135deg, rgba(57, 255, 20, 0.1) 0 3px, transparent 3px 8px);
}
.bp-tick {
  position: absolute;
  top: -5px;
  bottom: -5px;
  width: 3px;
  margin-left: -1.5px;
  background: var(--c);
  box-shadow: 0 0 6px var(--c);
}
.bp-tick.bp-avoid { background: repeating-linear-gradient(var(--c) 0 4px, transparent 4px 7px); box-shadow: none; }
.page-panel .bp-edges {
  display: flex;
  justify-content: space-between;
  margin: 3px 0 6px;
  font-size: 11px;
  color: var(--dim);
}
.page-panel .bp-spots {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-panel .bp-spots li {
  margin: 0;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c);
  font-size: 12px;
  line-height: 1.5;
  color: var(--body);
}
.bp-spots b { font-weight: 400; color: var(--fg); }
.bp-spots .bp-where { color: var(--purple); }
.bp-spots .bp-note { color: var(--dim); }
.bp-spots code { font-size: 11px; }
.page-panel .bp-why { margin: 6px 0 0; font-size: 12px; line-height: 1.6; color: var(--body); }
.bp-why b { font-weight: 400; color: var(--mode-internet-radio); margin-right: 4px; }
.page-panel .bp-why--region { grid-column: 2; margin: 0 0 6px; color: var(--dim); }
.page-panel .bp-rules li { font-size: 13px; line-height: 1.6; margin: 0 0 4px; color: var(--body); }
/* CB extras: the common block shaded on the full bar, a labelled close-up, spots by country. */
.bp-seg {
  position: absolute;
  top: 0;
  bottom: 0;
  background: rgba(57, 255, 20, 0.16);
  border-left: 1px solid rgba(57, 255, 20, 0.6);
  border-right: 1px solid rgba(57, 255, 20, 0.6);
}
.page-panel .bp-edges { position: relative; }
.bp-seg-label { position: absolute; transform: translateX(-50%); color: var(--mode-internet-radio); }
.page-panel .bp-zoom-title { margin: 4px 0 26px; font-size: 12px; color: var(--dim); }
.bp-tick em {
  position: absolute;
  bottom: calc(100% + 2px);
  left: 50%;
  transform: translateX(-50%);
  font-style: normal;
  font-size: 11px;
  line-height: 1;
  color: var(--c);
}
.bp-tick em.bp-tick--hi { bottom: calc(100% + 15px); }
.bp-tick[style^="left:0.00%"] em { left: 0; transform: none; }
.bp-regions {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 6px 10px;
  align-items: start;
}
.bp-regions > div { display: contents; }
/* CB pills line up in columns: frequency, mode, channel, preset. */
.page-panel .bp-regions .bp-spots {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}
@media (max-width: 700px) {
  .page-panel .bp-regions .bp-spots { grid-template-columns: minmax(0, 1fr); }
}
.page-panel .bp-regions .bp-spots li {
  display: grid;
  grid-template-columns: 6ch 3ch 10ch auto;
  column-gap: 1.2ch;
  align-items: baseline;
}
.bp-regions .bp-spots code { justify-self: start; }
.bp-regions > div > .bp-where { padding-top: 4px; font-size: 12px; color: var(--purple); }
.bp-plan[data-bp-region="eu"] [data-groups]:not([data-groups~="eu"]),
.bp-plan[data-bp-region="na"] [data-groups]:not([data-groups~="na"]),
.bp-plan[data-bp-region="anz"] [data-groups]:not([data-groups~="anz"]) { display: none; }
.bp-plan[data-bp-region="eu"] .bp-regions > [data-groups~="eu"],
.bp-plan[data-bp-region="na"] .bp-regions > [data-groups~="na"],
.bp-plan[data-bp-region="anz"] .bp-regions > [data-groups~="anz"] { display: contents; }

/* Article pages: next / previous in the same category. */
.article-next {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 20px;
  margin-top: 36px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.article-nextlink { margin-left: auto; text-align: right; }