/* Motoreka Training — site styles
   Layout concept: engineering datasheet. Navy header rail, paper pages,
   mono labels for data and status, one copper mark per surface (the rotor pole). */
@font-face { font-family: "Archivo"; font-style: normal; font-weight: 400; font-display: swap; src: url("../../../assets/fonts/archivo-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Archivo"; font-style: normal; font-weight: 500; font-display: swap; src: url("../../../assets/fonts/archivo-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Archivo"; font-style: normal; font-weight: 600; font-display: swap; src: url("../../../assets/fonts/archivo-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Archivo"; font-style: normal; font-weight: 700; font-display: swap; src: url("../../../assets/fonts/archivo-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: "Archivo"; font-style: normal; font-weight: 800; font-display: swap; src: url("../../../assets/fonts/archivo-latin-800-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../../../assets/fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("../../../assets/fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); }
:root {
  --navy: #101B25;          /* brand base */
  --graphite: #2C4453;      /* brand structure */
  --copper: #C0703A;        /* brand warm accent: rotor pole only */
  --steel: #5F8FA8;         /* brand cool accent */
  --paper: #F5F3EF;         /* brand surface */

  --bg: var(--paper);
  --surface: #FCFBF8;
  --surface-2: #ECE9E2;
  --ink: var(--navy);
  --ink-2: var(--graphite);
  --muted: #56666F;
  --line: #D8D3C9;
  --line-strong: #B9B3A7;
  --link: var(--graphite);
  --link-line: var(--steel);
  --chip-conf-bg: #DCE8EF; --chip-conf-fg: #1F4A61;
  --chip-inf-bg: #ECE9E2;  --chip-inf-fg: #2C4453;
  --chip-tgt-bg: #2C4453;  --chip-tgt-fg: #F5F3EF;
  --chip-na-bg: transparent; --chip-na-fg: #56666F;
  --chip-prep-bg: #ECE9E2; --chip-prep-fg: #56666F;
  --chip-ok-bg: #DCE8EF;   --chip-ok-fg: #1F4A61;

  --rail: #101B25;          /* header and nameplate: navy in both themes */
  --rail-2: #1A2A38;
  --rail-ink: #F5F3EF;
  --rail-muted: #8FAFC1;
  --rail-line: #2C4453;

  --f-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "IBM Plex Mono", "Consolas", "Menlo", monospace;

  --measure: 68ch;
  --wrap: 1120px;
  --gutter: clamp(16px, 4vw, 40px);
  --r: 4px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0E1820; --surface: #13212C; --surface-2: #1A2B38;
    --ink: #F1EFEA; --ink-2: #C3CFD6; --muted: #8FA2AE;
    --line: #243746; --line-strong: #35506A;
    --link: #D3DEE5; --link-line: #7FA9BF;
    --chip-conf-bg: #1D3A4C; --chip-conf-fg: #BFD9E7;
    --chip-inf-bg: #1A2B38;  --chip-inf-fg: #C3CFD6;
    --chip-tgt-bg: #C3CFD6;  --chip-tgt-fg: #101B25;
    --chip-na-fg: #8FA2AE;
    --chip-prep-bg: #1A2B38; --chip-prep-fg: #8FA2AE;
    --chip-ok-bg: #1D3A4C;   --chip-ok-fg: #BFD9E7;
    --rail: #09121A; --rail-2: #13212C; --rail-line: #243746;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0E1820; --surface: #13212C; --surface-2: #1A2B38;
  --ink: #F1EFEA; --ink-2: #C3CFD6; --muted: #8FA2AE;
  --line: #243746; --line-strong: #35506A;
  --link: #D3DEE5; --link-line: #7FA9BF;
  --chip-conf-bg: #1D3A4C; --chip-conf-fg: #BFD9E7;
  --chip-inf-bg: #1A2B38;  --chip-inf-fg: #C3CFD6;
  --chip-tgt-bg: #C3CFD6;  --chip-tgt-fg: #101B25;
  --chip-na-fg: #8FA2AE;
  --chip-prep-bg: #1A2B38; --chip-prep-fg: #8FA2AE;
  --chip-ok-bg: #1D3A4C;   --chip-ok-fg: #BFD9E7;
  --rail: #09121A; --rail-2: #13212C; --rail-line: #243746;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--f-body); font-size: 16px; line-height: 1.6;
  font-feature-settings: "tnum" 1;
}
img, svg { max-width: 100%; }
a { color: var(--link); text-decoration: underline; text-decoration-color: var(--link-line);
    text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--steel); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--f-display); line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-weight: 800; font-size: clamp(2rem, 4.2vw, 3rem); letter-spacing: -0.015em; }
h2 { font-weight: 700; font-size: clamp(1.35rem, 2.4vw, 1.7rem); letter-spacing: -0.01em; }
h3 { font-weight: 600; font-size: 1.1rem; }
p { margin: 0; max-width: var(--measure); }
.mono { font-family: var(--f-mono); }
.label {
  font-family: var(--f-mono); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted);
}
.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--surface); padding: 8px 12px; z-index: 10; }

/* ---------- header rail ---------- */
.rail { background: var(--rail); color: var(--rail-ink); border-bottom: 1px solid var(--rail-line); }
.rail .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 12px 28px; padding-block: 14px; }
.lockup { display: flex; align-items: center; gap: 12px; color: var(--rail-ink); text-decoration: none; }
.lockup svg { width: 40px; height: 40px; flex: none; }
.lockup .word { display: grid; line-height: 1; gap: 5px; }
.lockup .word b { font-family: var(--f-display); font-weight: 800; font-size: 1.3rem; letter-spacing: 0.01em; }
.lockup .word span { font-family: var(--f-mono); font-size: 0.62rem; letter-spacing: 0.26em; color: var(--rail-muted); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 0.92rem; }
.nav a { color: var(--rail-ink); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover { border-bottom-color: var(--rail-muted); }
.nav a[aria-current="page"] { border-bottom-color: var(--steel); }

/* ---------- page header ---------- */
.pagehead { border-bottom: 1px solid var(--line); background: var(--surface); }
.pagehead .wrap { padding-block: clamp(28px, 5vw, 48px); display: grid; gap: 14px; }
.pagehead .lede { font-size: 1.12rem; color: var(--ink-2); }
.meta { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.meta span { font-family: var(--f-mono); font-size: 0.78rem; color: var(--muted); }
.meta span b { color: var(--ink); font-weight: 500; }

/* ---------- content ---------- */
main { display: block; }
.section { padding-block: clamp(28px, 5vw, 52px); border-bottom: 1px solid var(--line); }
.section:last-child { border-bottom: 0; }
.section > .wrap { display: grid; gap: 18px; }
.section-head { display: grid; gap: 8px; }
.prose { display: grid; gap: 12px; align-content: start; }
.prose ul, .prose ol { margin: 0; padding-left: 1.25em; display: grid; gap: 6px; max-width: var(--measure); }
.note { font-size: 0.92rem; color: var(--muted); }
.two { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: 24px; }
.two > * { min-width: 0; }

/* tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
th, td { text-align: left; vertical-align: top; padding: 10px 14px; border-bottom: 1px solid var(--line); }
tr:last-child > td { border-bottom: 0; }
thead th { font-family: var(--f-mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted); background: var(--surface-2); white-space: nowrap; }
td.num, th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
td.id { font-family: var(--f-mono); font-weight: 500; white-space: nowrap; color: var(--ink-2); }
tr.total td { font-weight: 600; background: var(--surface-2); }
td .sub { display: block; font-size: 0.84rem; color: var(--muted); }
tbody th { font-weight: 500; }
.eq { font-family: var(--f-mono); font-size: 0.86rem; white-space: nowrap; }

/* status chips */
.chip { display: inline-block; font-family: var(--f-mono); font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase; padding: 2px 7px; border-radius: 3px;
  white-space: nowrap; line-height: 1.5; }
.chip.conf { background: var(--chip-conf-bg); color: var(--chip-conf-fg); }
.chip.inf  { background: var(--chip-inf-bg);  color: var(--chip-inf-fg); box-shadow: inset 0 0 0 1px var(--line-strong); }
.chip.tgt  { background: var(--chip-tgt-bg);  color: var(--chip-tgt-fg); }
.chip.na   { background: var(--chip-na-bg);   color: var(--chip-na-fg); box-shadow: inset 0 0 0 1px var(--line-strong); }
.chip.prep { background: var(--chip-prep-bg); color: var(--chip-prep-fg); }
.chip.ok   { background: var(--chip-ok-bg);   color: var(--chip-ok-fg); }
.legend { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 10px 24px; }
.legend div { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: start; font-size: 0.9rem; }

/* buttons */
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: 0.95rem;
  padding: 10px 16px; border-radius: var(--r); text-decoration: none; border: 1px solid transparent; }
.btn.solid { background: var(--paper); color: var(--navy); }
.btn.line { color: var(--rail-ink); border-color: var(--rail-muted); }
.btn.solid:hover, .btn.line:hover { text-decoration: none; filter: brightness(1.06); }

/* ---------- hero (home) ---------- */
.hero { background: var(--rail); color: var(--rail-ink); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: clamp(24px, 5vw, 64px);
  align-items: center; padding-block: clamp(36px, 7vw, 72px); }
.hero .label { color: var(--rail-muted); }
.hero h1 { color: var(--rail-ink); margin-top: 12px; }
.hero .lede { color: #C9D6DE; font-size: 1.12rem; margin-top: 16px; }
.hero .actions { margin-top: 26px; }
@media (max-width: 820px) { .hero .wrap { grid-template-columns: 1fr; } }

/* nameplate / design card */
.plate { margin: 0; background: var(--rail-2); color: var(--rail-ink); border: 1px solid var(--rail-line); border-radius: var(--r);
  padding: 18px 20px; display: grid; gap: 14px; }
.plate-top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; gap: 8px 12px;
  padding-bottom: 12px; border-bottom: 1px solid var(--rail-line); }
.plate-top .lockup svg { width: 28px; height: 28px; }
.plate-top .lockup b { font-family: var(--f-display); font-weight: 800; font-size: 1.05rem; }
.plate-top .id { font-family: var(--f-mono); font-size: 0.66rem; letter-spacing: 0.16em; color: var(--rail-muted);
  text-align: right; line-height: 1.6; }
.plate-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 14px; }
.plate-grid div { display: grid; gap: 2px; min-width: 0; }
.plate-grid dt { font-family: var(--f-mono); font-size: 0.62rem; letter-spacing: 0.14em; color: var(--rail-muted); text-transform: uppercase; }
.plate-grid dd { margin: 0; font-family: var(--f-mono); font-size: 0.9rem; display: flex; gap: 6px; align-items: baseline; }
.plate-grid dd i { font-style: normal; font-size: 0.6rem; color: var(--rail-muted); border: 1px solid var(--rail-line);
  padding: 0 4px; border-radius: 2px; }
.plate-foot { font-family: var(--f-mono); font-size: 0.66rem; letter-spacing: 0.1em; color: var(--rail-muted); }
@media (max-width: 460px) { .plate-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .plate-top .id { text-align: left; } }

/* key figures */
.figs { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr));
  border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.figs div { padding: 16px 18px; border-right: 1px solid var(--line); display: grid; gap: 4px; }
.figs div:last-child { border-right: 0; }
.figs b { font-family: var(--f-display); font-weight: 700; font-size: 1.45rem; font-variant-numeric: tabular-nums; }
.figs small { font-size: 0.84rem; color: var(--muted); }
@media (max-width: 700px) { .figs div { border-right: 0; border-bottom: 1px solid var(--line); } .figs div:last-child { border-bottom: 0; } }

/* session sequence */
.days { display: grid; gap: 28px; }
.day { display: grid; gap: 0; border-top: 2px solid var(--ink); }
.day > .label { padding-block: 10px; color: var(--ink-2); }
.srow { display: grid; grid-template-columns: 64px minmax(0, 1fr) minmax(0, 220px) auto; gap: 16px; align-items: start;
  padding: 16px 0; border-top: 1px solid var(--line); color: inherit; text-decoration: none; }
.srow:hover .stitle { text-decoration: underline; text-decoration-color: var(--link-line); text-underline-offset: 3px; }
.srow .sno { font-family: var(--f-mono); font-weight: 500; font-size: 1.1rem; color: var(--ink-2); }
.srow .stitle { font-family: var(--f-display); font-weight: 700; font-size: 1.12rem; }
.srow .sdesc { font-size: 0.93rem; color: var(--ink-2); margin-top: 3px; }
.srow .stool { font-size: 0.86rem; color: var(--muted); display: grid; gap: 2px; }
.srow .stool b { font-weight: 500; color: var(--ink); }
.srow .sside { display: grid; gap: 6px; justify-items: end; }
.srow .stime { font-family: var(--f-mono); font-size: 0.8rem; color: var(--muted); white-space: nowrap; }
@media (max-width: 760px) {
  .srow { grid-template-columns: 44px minmax(0, 1fr); }
  .srow .stool, .srow .sside { grid-column: 2; justify-items: start; }
  .srow .sside { display: flex; gap: 10px; align-items: center; }
}

/* materials trio */
.trio { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 0;
  border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.trio > div { padding: 20px; display: grid; gap: 8px; align-content: start; border-right: 1px solid var(--line); }
.trio > div:last-child { border-right: 0; }
.trio p { font-size: 0.93rem; color: var(--ink-2); }
@media (max-width: 760px) { .trio > div { border-right: 0; border-bottom: 1px solid var(--line); } .trio > div:last-child { border-bottom: 0; } }

/* session page placeholders */
.slot { border: 1px dashed var(--line-strong); border-radius: var(--r); padding: 18px 20px; display: grid; gap: 6px;
  background: var(--surface); }
.slot p { color: var(--muted); font-size: 0.93rem; }
.mat { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.mat > div { display: grid; grid-template-columns: 150px minmax(0, 1fr) auto; gap: 14px; padding: 12px 16px;
  border-bottom: 1px solid var(--line); align-items: baseline; }
.mat > div:last-child { border-bottom: 0; }
.mat .k { font-family: var(--f-mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
@media (max-width: 600px) { .mat > div { grid-template-columns: 1fr auto; } .mat .k { grid-column: 1 / -1; } }
.pager { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.pager a { display: grid; gap: 2px; text-decoration: none; }
.pager a b { font-weight: 600; color: var(--ink); }
.pager a:hover b { text-decoration: underline; text-decoration-color: var(--link-line); }
.pager .next { text-align: right; margin-left: auto; }

/* sources */
.sources { font-size: 0.88rem; display: grid; gap: 6px; padding-left: 1.4em; margin: 0; max-width: 90ch; }

/* footer */
footer { background: var(--rail); color: var(--rail-muted); font-size: 0.84rem; }
footer .wrap { padding-block: 22px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
footer .mono { font-size: 0.74rem; letter-spacing: 0.06em; }

@media print {
  .rail, footer, .nav, .actions, .pager, .skip { display: none !important; }
  body { background: #fff; color: #000; font-size: 10.5pt; }
  .pagehead, .table-wrap, .figs { background: #fff; }
  .section { padding-block: 14px; break-inside: auto; }
  .table-wrap { overflow: visible; }
  tr { break-inside: avoid; }
  a { color: #000; text-decoration: none; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* ---------- sessions dropdown ---------- */
.nav { align-items: center; }
.dd { position: relative; }
.dd summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 0; border-bottom: 2px solid transparent; color: var(--rail-ink); }
.dd summary::-webkit-details-marker { display: none; }
.dd summary:hover { border-bottom-color: var(--rail-muted); }
.dd summary[aria-current="page"] { border-bottom-color: var(--steel); }
.dd .caret { transition: transform .15s; }
.dd[open] .caret { transform: rotate(180deg); }
.dd-menu { position: absolute; top: calc(100% + 10px); right: 0; z-index: 20; margin: 0; padding: 6px 0;
  list-style: none; width: min(360px, calc(100vw - 32px)); background: var(--rail-2); border: 1px solid var(--rail-line);
  border-radius: var(--r); box-shadow: 0 12px 28px rgba(0,0,0,.28); }
.dd-day { font-family: var(--f-mono); font-size: 0.64rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--rail-muted); padding: 10px 16px 4px; }
.dd-day:not(:first-child) { border-top: 1px solid var(--rail-line); margin-top: 6px; }
.dd-menu a { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; gap: 8px; align-items: baseline;
  padding: 8px 16px; color: var(--rail-ink); text-decoration: none; border-left: 2px solid transparent; }
.dd-menu a:hover, .dd-menu a:focus-visible { background: var(--rail); }
.dd-menu a[aria-current="page"] { border-left-color: var(--steel); background: var(--rail); }
.dd-no { font-family: var(--f-mono); font-weight: 500; font-size: 0.82rem; color: var(--rail-muted); }
.dd-t { font-size: 0.92rem; }
.dd-m { font-family: var(--f-mono); font-size: 0.72rem; color: var(--rail-muted); white-space: nowrap; }
@media (max-width: 720px) { .rail .wrap { position: relative; } .dd { position: static; }
  .dd-menu { top: calc(100% - 4px); left: var(--gutter); right: var(--gutter); width: auto; } }

/* ---------- session strip (session pages) ---------- */
.sstrip { background: var(--surface-2); border-bottom: 1px solid var(--line); }
.sstrip .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding-block: 10px; }
.sstrip-links { display: flex; flex-wrap: wrap; gap: 6px; }
.sstrip-links a { font-family: var(--f-mono); font-size: 0.8rem; font-weight: 500; text-decoration: none; color: var(--ink-2);
  padding: 4px 10px; border: 1px solid var(--line-strong); border-radius: 3px; background: var(--surface); }
.sstrip-links a:hover { border-color: var(--ink-2); }
.sstrip-links a[aria-current="page"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
@media print { .sstrip { display: none !important; } }

/* ---------- buttons on paper ---------- */
.btn { cursor: pointer; font-family: var(--f-body); line-height: 1.2; }
.btn.pri { background: var(--ink); color: var(--bg); }
.btn.sec { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.btn.ghost { background: transparent; color: var(--ink-2); border-color: transparent; }
.btn.pri:hover, .btn.sec:hover { text-decoration: none; filter: brightness(1.08); }
.btn.sec:hover { border-color: var(--ink-2); }
.btn.ghost:hover { background: var(--surface-2); text-decoration: none; }
.pagehead .actions { margin-top: 6px; }
.chip.bad { background: #F4DCD3; color: #7A2E12; }
:root[data-theme="dark"] .chip.bad { background: #4A2618; color: #F4CDBE; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .chip.bad { background: #4A2618; color: #F4CDBE; } }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- notes ---------- */
.eqn { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px 20px;
  padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--graphite);
  border-radius: 0; overflow-x: auto; }
.eqn-m { font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif; font-size: 1.12rem; white-space: nowrap; }
.eqn-m i { font-style: italic; }
.eqn-l { font-family: var(--f-mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.fig { margin: 0; display: grid; gap: 8px; }
.fig img { width: 100%; height: auto; background: #FCFBF8; border: 1px solid var(--line); border-radius: var(--r); padding: 8px; }
.fig figcaption { font-size: 0.88rem; color: var(--muted); max-width: var(--measure); }
.callout { border: 1px solid var(--line); background: var(--surface-2); padding: 14px 18px; display: grid; gap: 6px; border-radius: var(--r); }
.prose h3 { margin-top: 8px; }

/* ---------- worksheet ---------- */
.ws-part { display: grid; gap: 14px; padding-top: 18px; border-top: 2px solid var(--ink); }
.ws-ph { display: grid; gap: 6px; }
.ws-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.ws-step { padding: 16px 18px; border-bottom: 1px solid var(--line); display: grid; gap: 8px; }
.ws-step:last-child { border-bottom: 0; }
.ws-h { display: flex; gap: 12px; align-items: baseline; }
.ws-id { font-family: var(--f-mono); font-weight: 500; color: var(--ink-2); min-width: 2.2em; }
.ws-h h4 { margin: 0; font-family: var(--f-display); font-weight: 600; font-size: 1rem; }
.ws-eq { font-family: "Cambria Math", "Times New Roman", serif; font-size: 1.02rem; color: var(--ink-2); overflow-x: auto; white-space: nowrap; padding: 2px 0; }
.ws-ans { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; max-width: 640px; }
.ws-ans li { display: grid; grid-template-columns: minmax(0, 1fr) 150px 56px; gap: 10px; align-items: end; font-size: 0.93rem; }
.ws-blank { border-bottom: 1px solid var(--line-strong); height: 1.3em; }
.ws-u { font-family: var(--f-mono); font-size: 0.8rem; color: var(--muted); }
.ws-lines { height: 4.2em; background: repeating-linear-gradient(to bottom, transparent 0, transparent calc(1.4em - 1px), var(--line-strong) calc(1.4em - 1px), var(--line-strong) 1.4em); max-width: 640px; }
.ws-note { font-size: 0.9rem; color: var(--ink-2); font-style: italic; }
@media (max-width: 560px) { .ws-ans li { grid-template-columns: minmax(0, 1fr) 90px 48px; } }
.reveal { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.reveal summary { cursor: pointer; padding: 14px 18px; font-weight: 600; }
.reveal-body { padding: 4px 18px 18px; display: grid; gap: 22px; }
.toolcard { display: grid; gap: 16px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); padding: 20px; }

/* ---------- quiz ---------- */
.quiz { display: grid; gap: 14px; }
.q { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); padding: 14px 18px; margin: 0; display: grid; gap: 6px; }
.q legend { font-weight: 600; padding: 0 4px; display: flex; gap: 10px; }
.q-n { font-family: var(--f-mono); color: var(--muted); font-weight: 500; }
.qopt { display: flex; gap: 10px; align-items: flex-start; padding: 6px 8px; border-radius: 3px; cursor: pointer; font-size: 0.95rem; }
.qopt input { margin-top: 5px; accent-color: var(--graphite); }
.qopt:hover { background: var(--surface-2); }
.q.right { border-color: var(--steel); }
.q.wrong { border-color: #B5603A; }
.q .qopt.is-a { box-shadow: inset 3px 0 0 var(--steel); background: var(--surface-2); }
.q-why { font-size: 0.9rem; color: var(--ink-2); padding: 4px 8px 0; }
.quiz-score { font-family: var(--f-mono); font-size: 0.9rem; align-self: center; }

/* ---------- calculator ---------- */
.calc .wrap { max-width: 1280px; }
.calc-grid { display: grid !important; grid-template-columns: 340px minmax(0, 1fr); gap: 28px; align-items: start; }
@media (max-width: 960px) { .calc-grid { grid-template-columns: 1fr; } }
.calc-in { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow-y: auto; border: 1px solid var(--line);
  border-radius: var(--r); background: var(--surface); }
@media (max-width: 960px) { .calc-in { position: static; max-height: none; } }
.calc-form { display: grid; gap: 0; }
.fs { border-top: 1px solid var(--line); }
.fs summary { cursor: pointer; padding: 12px 16px; font-weight: 600; font-size: 0.95rem; }
.fs-b { padding: 0 16px 12px; display: grid; gap: 8px; }
.fi { display: grid; grid-template-columns: minmax(0, 1fr) 130px; gap: 8px; align-items: center; font-size: 0.88rem; }
.fi label { color: var(--ink-2); line-height: 1.3; }
.fi label small { display: block; font-family: var(--f-mono); font-size: 0.68rem; color: var(--muted); letter-spacing: 0.04em; }
.fi-in { display: flex; align-items: center; gap: 6px; }
.fi-in span { font-family: var(--f-mono); font-size: 0.72rem; color: var(--muted); min-width: 34px; }
.fi input, .fi-group input { width: 100%; min-width: 0; font-family: var(--f-mono); font-size: 0.9rem; padding: 6px 8px; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line-strong); border-radius: 3px; font-variant-numeric: tabular-nums; }
.fi input:focus, .fi-group input:focus, textarea:focus { outline: 2px solid var(--steel); outline-offset: 0; border-color: var(--steel); }
.fi-group { padding: 14px 16px; grid-template-columns: 1fr; gap: 6px; }
.calc-btns { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--line); }
.calc-btns .btn { font-size: 0.88rem; padding: 8px 12px; }
.calc-msg { font-size: 0.86rem; color: var(--ink-2); padding: 0 16px 12px; min-height: 0; }
.calc-msg:empty { display: none; }
.calc-out { display: grid; gap: 22px; min-width: 0; }
.calc-sum { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 0; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.checks li { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; grid-template-rows: auto auto; gap: 0 10px; padding: 10px 14px;
  border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); }
.ck-id { grid-row: 1 / 3; font-family: var(--f-mono); font-weight: 500; font-size: 0.82rem; color: var(--ink-2); padding-top: 2px; }
.ck-l { font-size: 0.9rem; font-weight: 500; }
.ck-d { grid-column: 2; font-family: var(--f-mono); font-size: 0.75rem; color: var(--muted); }
.ck-s { grid-column: 3; grid-row: 1 / 3; align-self: center; font-family: var(--f-mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 2px 7px; border-radius: 3px; }
.checks li.ok .ck-s { background: var(--chip-ok-bg); color: var(--chip-ok-fg); }
.checks li.bad .ck-s { background: #F4DCD3; color: #7A2E12; }
.checks li.bad { background: color-mix(in srgb, #C0703A 7%, transparent); }
.calc-plate .plate-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
.calc-plate .plate-grid dd { font-size: 0.95rem; }
.calc-charts { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); gap: 20px; }
.calc-chart, .calc-tb, .card-io { display: grid; gap: 8px; min-width: 0; }
.calc-chart > div { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); padding: 6px; }
.card-io textarea { width: 100%; font-family: var(--f-mono); font-size: 0.78rem; background: var(--surface); color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: 3px; padding: 10px; resize: vertical; }
.file-btn input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.file-btn { position: relative; }
.file-btn:focus-within { outline: 2px solid var(--steel); outline-offset: 2px; }
svg.chart { width: 100%; height: auto; display: block; font-family: var(--f-body); }
svg.chart .grid { stroke: var(--line); stroke-width: 1; }
svg.chart .axis { stroke: var(--muted); stroke-width: 1; }
svg.chart .tick { fill: var(--muted); font-size: 11px; font-family: var(--f-mono); }
svg.chart .axlabel { fill: var(--ink-2); font-size: 12px; }
svg.chart .ref { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 3; }
svg.chart .reflabel { fill: var(--muted); font-size: 11px; font-family: var(--f-mono); }
svg.chart .s-peak { stroke: var(--ink); stroke-width: 2.4; }
svg.chart .s-cont { stroke: var(--steel); stroke-width: 2; stroke-dasharray: 7 4; }
svg.chart .s-cont-fill { fill: var(--steel); opacity: 0.12; }
svg.chart .s-peak-label { fill: var(--ink); font-size: 12px; font-weight: 600; }
svg.chart .s-cont-label { fill: var(--steel); font-size: 12px; font-weight: 600; }
svg.chart .pt { fill: var(--ink); stroke: var(--surface); stroke-width: 1.5; }
svg.chart .pt-bad { fill: #B5603A; stroke: var(--surface); stroke-width: 1.5; }
svg.chart .pt-hi { fill: var(--copper); stroke: var(--surface); stroke-width: 1.5; }
svg.chart .ptlabel { fill: var(--ink); font-size: 11.5px; }
@media print { .calc-in, .card-io, .quiz, .reveal summary { display: none !important; } .reveal-body { display: grid !important; } }

/* ---------- S2: matrix, legend, topology comparator ---------- */
.fig-legend { width: 100%; height: auto; max-width: 1100px; }
.ws-blank.wide { display: block; min-width: 180px; }
table.matrix td, table.matrix th { text-align: center; padding: 8px 6px; }
table.matrix td:first-child, table.matrix th:first-child { text-align: left; white-space: nowrap; }
table.matrix thead th { white-space: normal; min-width: 58px; font-size: 0.58rem; letter-spacing: 0.06em; padding: 8px 4px; }
table.matrix td { padding: 7px 4px; }
.sc { display: inline-block; min-width: 26px; padding: 2px 0; border-radius: 3px; font-family: var(--f-mono); font-weight: 500; font-size: 0.85rem; }
.sc1 { background: #F4DCD3; color: #7A2E12; } .sc2 { background: #F1E6DD; color: #7A4A2A; } .sc3 { background: var(--surface-2); color: var(--ink-2); }
.sc4 { background: #DCE8EF; color: #1F4A61; } .sc5 { background: #2C4453; color: #F5F3EF; }
:root[data-theme="dark"] .sc1, :root[data-theme="dark"] .sc2 { background: #4A2618; color: #F4CDBE; }
:root[data-theme="dark"] .sc4 { background: #1D3A4C; color: #BFD9E7; } :root[data-theme="dark"] .sc5 { background: #C3CFD6; color: #101B25; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .sc1, :root:not([data-theme="light"]) .sc2 { background: #4A2618; color: #F4CDBE; }
  :root:not([data-theme="light"]) .sc4 { background: #1D3A4C; color: #BFD9E7; } :root:not([data-theme="light"]) .sc5 { background: #C3CFD6; color: #101B25; } }
.topo { display: grid !important; gap: 28px; }
.topo h2 { font-size: 1.3rem; }
.topo-req { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); padding: 16px 18px; display: grid; gap: 12px; }
.topo-req-h { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 20px; align-items: end; }
.topo-req-h h2 { font-size: 1.05rem; margin-top: 4px; }
.req-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px 16px; margin: 0; }
.req-grid div { display: grid; gap: 2px; } .req-grid dt { font-family: var(--f-mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.req-grid dd { margin: 0; font-family: var(--f-mono); font-size: 0.98rem; }
.topo-grid { display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: 28px; align-items: start; }
@media (max-width: 960px) { .topo-grid { grid-template-columns: 1fr; } }
.topo-w, .topo-r { display: grid; gap: 12px; min-width: 0; }
.presets .btn { font-size: 0.82rem; padding: 6px 10px; }
.presets .btn[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.weights { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.wrow { display: grid; grid-template-columns: minmax(0, 1fr) 110px 22px; gap: 10px; align-items: center; padding: 9px 14px; border-bottom: 1px solid var(--line); }
.wrow:last-child { border-bottom: 0; }
.wrow label { font-size: 0.88rem; line-height: 1.3; } .wrow label b { font-weight: 600; display: block; }
.wrow label small { color: var(--muted); font-size: 0.76rem; }
.wrow input[type=range] { width: 100%; accent-color: var(--graphite); }
.wrow output { font-family: var(--f-mono); font-weight: 500; text-align: right; }
.rank { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.rk { width: 100%; display: grid; grid-template-columns: 22px minmax(0, 230px) minmax(60px, 1fr) 46px 44px; gap: 10px; align-items: center; text-align: left;
  font: inherit; color: inherit; background: var(--surface); border: 1px solid var(--line); border-radius: 3px; padding: 8px 10px; cursor: pointer; }
.rk:hover { border-color: var(--line-strong); } .rk.on { border-color: var(--ink); box-shadow: inset 3px 0 0 var(--ink); }
.rk-n { font-family: var(--f-mono); color: var(--muted); font-size: 0.8rem; }
.rk-name { font-size: 0.9rem; font-weight: 500; } .rk-name .chip { margin-left: 4px; }
.rk-bar { height: 10px; background: var(--surface-2); border-radius: 2px; overflow: hidden; } .rk-bar i { display: block; height: 100%; background: var(--steel); }
.rk.first .rk-bar i { background: var(--ink); }
.rk-v, .rk-gap { font-family: var(--f-mono); font-size: 0.82rem; text-align: right; } .rk-gap { color: var(--muted); }
@media (max-width: 560px) { .rk { grid-template-columns: 20px minmax(0, 1fr) 44px; } .rk-bar, .rk-gap { display: none; } }
.rank-note { font-size: 0.9rem; color: var(--ink-2); font-style: italic; }
.topo-det { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); padding: 16px 18px; display: grid; gap: 12px; }
.topo-det-h h3 { font-size: 1.1rem; }
.det-scores, .det-flags, .det-ex { list-style: none; margin: 6px 0 12px; padding: 0; display: grid; gap: 5px; font-size: 0.88rem; }
.det-scores li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; align-items: center; }
.dots { display: inline-flex; gap: 3px; } .dots i { width: 12px; height: 12px; border-radius: 2px; background: var(--surface-2); box-shadow: inset 0 0 0 1px var(--line-strong); }
.dots i.on { background: var(--graphite); box-shadow: none; }
.det-flags li { display: grid; grid-template-columns: auto auto minmax(0, 1fr); gap: 8px; align-items: baseline; }
.det-ex li::before { content: "– "; color: var(--muted); }
table.robust td.p1 { font-weight: 700; background: var(--surface-2); }
table.robust th.num { white-space: normal; text-align: right; }
.score-edit input { width: 48px; font-family: var(--f-mono); text-align: center; padding: 4px; background: var(--bg); color: var(--ink); border: 1px solid var(--line-strong); border-radius: 3px; }
.score-edit input.changed { border-color: var(--copper); box-shadow: inset 0 0 0 1px var(--copper); }
.score-edit thead th { white-space: normal; font-size: 0.62rem; min-width: 70px; }
.decide { display: grid; grid-template-columns: minmax(0, 300px) minmax(0, 1fr); gap: 16px; }
@media (max-width: 760px) { .decide { grid-template-columns: 1fr; } }
.decide .fi-group { padding: 0; display: grid; gap: 6px; }
.decide select, .decide textarea { width: 100%; font: inherit; font-size: 0.95rem; padding: 8px 10px; color: var(--ink); background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: 3px; }
.topo > * { min-width: 0; }
.topo-req-h .actions { flex-wrap: wrap; }
.decide { align-items: start; } .decide .fi-group { align-content: start; }

/* ---------- S3: materials explorer ---------- */
h3.sub { margin-top: 8px; font-size: 1.05rem; }
.mx-box { border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); min-width: 0; }
.mx-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--line); overflow-x: auto; }
.mx-tabs [role=tab] { font: inherit; font-weight: 600; font-size: 0.95rem; color: var(--muted); background: none; border: 0; border-bottom: 3px solid transparent;
  padding: 12px 20px 10px; cursor: pointer; white-space: nowrap; }
.mx-tabs [role=tab]:hover { color: var(--ink); }
.mx-tabs [role=tab][aria-selected="true"] { color: var(--ink); border-bottom-color: var(--ink); }
.mx-tabs [role=tab]:focus-visible { outline: 2px solid var(--steel); outline-offset: -2px; }
.mx-panel { padding: 18px; display: grid; gap: 20px; }
.mx-panel[hidden] { display: none; }
.mx-fields { display: grid; align-items: end; grid-template-columns: repeat(auto-fill, minmax(min(100%, 190px), 1fr)); gap: 12px 18px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.mxf { display: grid; gap: 5px; align-content: start; font-size: 0.86rem; }
.mxf label { color: var(--ink-2); line-height: 1.3; }
.mxf label small { display: block; font-family: var(--f-mono); font-size: 0.66rem; color: var(--muted); letter-spacing: 0.03em; }
.mxf input, .mxf select { width: 100%; min-width: 0; font-family: var(--f-mono); font-size: 0.9rem; padding: 6px 8px; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line-strong); border-radius: 3px; }
.mxf select { font-family: var(--f-body); }
.mxf input:focus, .mxf select:focus { outline: 2px solid var(--steel); outline-offset: 0; border-color: var(--steel); }
.mx-out { display: grid; gap: 20px; min-width: 0; }
.mx-out .calc-chart > div { max-width: 820px; }
.mx-sum { font-size: 0.95rem; font-weight: 500; margin: 4px 0 0; }
.mx-flag { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.mx-total { font-family: var(--f-mono); font-size: 1.3rem; }
.pick { display: inline-flex; gap: 8px; align-items: center; cursor: pointer; white-space: nowrap; }
.pick input { accent-color: var(--graphite); }
svg.chart .serlabel { fill: var(--ink-2); font-size: 11px; font-family: var(--f-mono); }
svg.chart .s-grey { stroke: var(--muted); stroke-width: 1.6; }
svg.chart .s-light { stroke: var(--steel); stroke-width: 1.6; stroke-dasharray: 2 3; }
svg.chart .s-cu { stroke: var(--steel); stroke-width: 2.2; stroke-dasharray: 8 3 2 3; }
.cost-bar { display: flex; height: 26px; border-radius: 3px; overflow: hidden; border: 1px solid var(--line); }
.cost-bar span { display: flex; align-items: center; padding-left: 8px; font-size: 0.76rem; font-weight: 600; white-space: nowrap; overflow: hidden; }
.cost-bar .b-fe { background: var(--graphite); color: #F5F3EF; }
.cost-bar .b-mag { background: var(--steel); color: #101B25; }
.cost-bar .b-cu { background: #D39A6E; color: #101B25; }
@media (max-width: 560px) { .mx-panel { padding: 14px; } .mx-tabs [role=tab] { padding: 10px 14px 8px; } }

/* ---------- S4: system impact calculator ---------- */
.imp-sum { display: grid; gap: 14px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); padding: 16px 18px; }
.imp-sum .checks { background: var(--bg); }
.mx-out > .req-grid { border-bottom: 1px solid var(--line); padding-bottom: 14px; }




/* dr:start — generated by source/pages_dr.py */
.cv-load { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; }
@media (max-width: 760px) { .cv-load { grid-template-columns: minmax(0, 1fr); } }
.cv-load textarea { width: 100%; font-family: var(--f-mono); font-size: 0.78rem; background: var(--surface); color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: var(--r); padding: 8px; min-height: 92px; }
#cv-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
#cv-list li { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; padding: 6px 10px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); }
#cv-list li .mono { font-size: 0.75rem; color: var(--muted); }
#cv-list li .btn { margin-left: auto; padding: 4px 10px; font-size: 0.82rem; }
.cv-opts { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; }
.cv-opts label.tg { display: inline-flex; gap: 8px; align-items: center; font-size: 0.92rem; }
#cv-summary { display: flex; flex-wrap: wrap; gap: 10px; }
.cv-sum { display: grid; gap: 2px; padding: 10px 14px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); min-width: 150px; }
.cv-sum.ref { background: var(--surface-2); }
.cv-sum b { font-family: var(--f-display); font-size: 1.05rem; }
.cv-sum span.bad, td.bad, td.bad .cv-mark { color: #A3341F; }
td.ok .cv-mark { color: #2F6B4F; }
:root[data-theme="dark"] .cv-sum span.bad, :root[data-theme="dark"] td.bad { color: #F0A58C; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .cv-sum span.bad, :root:not([data-theme="light"]) td.bad { color: #F0A58C; } :root:not([data-theme="light"]) td.ok .cv-mark { color: #8FD1AE; } }
.cv-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.cv-table th, .cv-table td { padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; text-align: left; }
.cv-table thead th { font-family: var(--f-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); background: var(--surface-2); }
.cv-table td.num { font-family: var(--f-mono); font-size: 0.84rem; white-space: nowrap; }
.cv-table td.long { min-width: 220px; max-width: 360px; font-size: 0.84rem; }
.cv-table .ref { background: var(--surface-2); }
.cv-table tr.cv-stage th { background: var(--bg); font-family: var(--f-display); font-size: 1rem; padding-top: 16px; color: var(--ink); }
.cv-table tr.cv-stage .label { margin-right: 8px; }
.cv-table th[scope=row] { font-weight: 500; min-width: 180px; }
.cv-lim { font-size: 0.82rem; color: var(--ink-2); white-space: nowrap; }
.cv-src { font-family: var(--f-mono); font-size: 0.7rem; color: var(--muted); margin-left: 4px; }
#cv-flags { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); gap: 12px; }
#cv-flags ul { margin: 6px 0 0; padding-left: 18px; font-size: 0.88rem; }
.rubric td:first-child { min-width: 170px; } .rubric td { font-size: 0.88rem; }
@media print { .cv-ctl, .rm-strip, .sstrip { display: none !important; } .cv-table { font-size: 8.5pt; } .cv-table td.long { max-width: none; } }
/* dr:end */

/* roadmap:start — generated by source/roadmap.py */
.roadmap { margin: 8px 0 0; max-width: 920px; width: 100%; justify-self: center; }
.rm-row { display: grid; justify-content: center; grid-template-columns: minmax(0, 440px); }
.rm-row.multi { position: relative; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: 16px; padding-block: 18px; }
.rm-row.multi::before, .rm-row.multi::after { content: ""; position: absolute;
  left: calc((100% - (var(--n) - 1) * 16px) / (2 * var(--n))); right: calc((100% - (var(--n) - 1) * 16px) / (2 * var(--n)));
  border-top: 1px solid var(--line-strong); }
.rm-row.multi::before { top: 0; } .rm-row.multi::after { bottom: 0; }
.rm-row.multi > .rm-node::before, .rm-row.multi > .rm-node::after { content: ""; position: absolute; left: 50%; height: 18px;
  border-left: 1px solid var(--line-strong); }
.rm-row.multi > .rm-node::before { top: -19px; } .rm-row.multi > .rm-node::after { bottom: -19px; }
.rm-node { position: relative; display: grid; gap: 4px; align-content: start; padding: 12px 14px 13px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); color: var(--ink); text-decoration: none; }
a.rm-node:hover { border-color: var(--line-strong); }
a.rm-node:hover b { text-decoration: underline; text-decoration-color: var(--link-line); text-underline-offset: 3px; }
.rm-node b { font-family: var(--f-display); font-weight: 600; font-size: 1rem; line-height: 1.25; }
.rm-node .rm-k { font-family: var(--f-mono); font-size: 0.66rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.rm-node .rm-d { font-size: 0.86rem; line-height: 1.45; color: var(--ink-2); }
.rm-node.limit { box-shadow: inset 0 3px 0 var(--steel); }
.rm-node.target { box-shadow: inset 0 3px 0 var(--ink-2); background: var(--surface-2); }
.rm-node.choice { background: var(--surface-2); }
.rm-arrow { position: relative; height: 26px; }
.rm-arrow::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 3px; border-left: 1px solid var(--line-strong); }
.rm-arrow::after { content: ""; position: absolute; left: calc(50% - 4px); bottom: 1px; width: 7px; height: 7px;
  border-right: 1px solid var(--line-strong); border-bottom: 1px solid var(--line-strong); transform: rotate(45deg); }
.rm-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 22px; margin-top: 16px;
  font-family: var(--f-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--muted); }
.rm-key i { display: inline-block; width: 18px; height: 12px; margin-right: 7px; vertical-align: -1px;
  border: 1px solid var(--line); border-radius: 2px; background: var(--surface); }
.rm-key.limit i { box-shadow: inset 0 3px 0 var(--steel); }
.rm-key.target i { box-shadow: inset 0 3px 0 var(--ink-2); background: var(--surface-2); }
.rm-key.choice i { background: var(--surface-2); }
@media (max-width: 760px) {
  .rm-row.multi { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; padding-block: 0; }
  .rm-row.multi[style*="--n:3"] { grid-template-columns: minmax(0, 1fr); }
  .rm-row.multi::before, .rm-row.multi::after, .rm-row.multi > .rm-node::before, .rm-row.multi > .rm-node::after { display: none; }
  .rm-row { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 480px) { .rm-row.multi { grid-template-columns: minmax(0, 1fr); } }
.rm-strip { border-bottom: 1px solid var(--line); background: var(--bg); }
.rm-strip .wrap { padding-block: 16px 18px; display: grid; gap: 10px; }
.rm-strip p { font-size: 0.92rem; color: var(--ink-2); max-width: 90ch; }
.rm-pills { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.rm-pills li { position: relative; font-family: var(--f-mono); font-size: 0.72rem; letter-spacing: 0.04em;
  padding: 5px 10px 5px 10px; border-radius: var(--r); background: var(--surface-2); color: var(--muted); }
.rm-pills li + li { margin-left: 14px; }
.rm-pills li + li::before { content: "›"; position: absolute; left: -15px; width: 14px; text-align: center; color: var(--line-strong); }
.rm-pills li.on { background: var(--chip-tgt-bg); color: var(--chip-tgt-fg); }
@media print { .rm-strip { display: none; } .rm-node { break-inside: avoid; } }
/* roadmap:end */
/* s0:start */
.chain{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.chain li{position:relative;display:grid;gap:6px;align-content:start;padding:16px 18px 16px 16px;border-right:1px solid var(--line)}
.chain li:last-child{border-right:0;background:var(--surface-2)}
.chain li:not(:last-child)::after{content:"";position:absolute;right:-7px;top:50%;width:12px;height:12px;background:var(--surface);border-top:1px solid var(--line);border-right:1px solid var(--line);transform:translateY(-50%) rotate(45deg);z-index:1}
.chain b{font-size:1rem}.chain li>span:last-child{font-size:.88rem;color:var(--ink-2)}
@media (max-width:900px){.chain{grid-template-columns:1fr}.chain li{border-right:0;border-bottom:1px solid var(--line)}.chain li:last-child{border-bottom:0}
 .chain li:not(:last-child)::after{right:auto;left:24px;top:auto;bottom:-7px;transform:rotate(135deg)}}

.pt{display:grid;gap:14px}
.pt-svg{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line,#D8D3C9);border-radius:var(--r,4px);background:var(--surface,#FCFBF8);padding:12px}
.pt-svg svg{display:block;width:100%;min-width:700px;height:auto}
.pt-notes{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:0 22px}
.pt-notes li{display:grid;grid-template-columns:26px minmax(0,1fr);gap:10px;padding:10px 0;border-top:1px solid var(--line,#D8D3C9);align-items:start}
.pt-n{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--steel,#5F8FA8);color:#fff;font-family:var(--f-mono,monospace);font-size:.72rem;margin-top:1px}
.pt-notes b{display:block;font-size:.92rem}.pt-notes span.t{font-size:.86rem;color:var(--ink-2,#2C4453);line-height:1.45}
.pt-hint{display:none;margin:-6px 0 0;font-size:.8rem;color:var(--muted,#56666F)}@media (max-width:760px){.pt-hint{display:block}}
.pt-notes .s{font-family:var(--f-mono,monospace);font-size:.64rem;letter-spacing:.1em;color:var(--muted,#56666F);margin-left:6px}
/* s0:end */


/* ---------- Sizing Calculator help ---------- */
.hp-quick { padding: 14px 16px 6px; border-bottom: 1px solid var(--line); background: var(--surface); }
.hp-quick h2 { font-size: 1rem; margin: 0 0 8px; }
.hp-quick ol { margin: 0 0 8px; padding-left: 1.2em; display: grid; gap: 6px; font-size: 0.88rem; color: var(--ink-2); line-height: 1.4; }
.hp-tip { font-size: 0.86rem; color: var(--ink-2); margin: 0 0 8px; }
.hp-tip .btn { font-size: 0.84rem; padding: 4px 8px; margin-left: 4px; }
.hp-btn { display: inline-grid; place-items: center; width: 20px; height: 20px; margin-left: 6px; padding: 0; vertical-align: middle;
  border-radius: 50%; border: 1px solid var(--steel); background: transparent; color: var(--ink-2);
  font: 600 0.72rem/1 var(--f-mono); cursor: pointer; }
.hp-btn:hover, .hp-btn[aria-expanded="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.hp-btn:focus-visible { outline: 2px solid var(--steel); outline-offset: 2px; }
.hp-demo { cursor: default; }
.hp-body { margin: -2px 0 4px; padding: 8px 10px; border-left: 3px solid var(--steel); background: var(--surface-2);
  font-size: 0.84rem; line-height: 1.4; color: var(--ink-2); display: grid; gap: 4px; }
.hp-body[hidden] { display: none; }
.hp-body p { margin: 0; }
.hp-body b { color: var(--ink); }
.hp-src { color: var(--muted); }
.hp-gif { margin: 0 0 8px; font-size: 0.86rem; }
.hp-gif summary { cursor: pointer; font-weight: 600; color: var(--ink-2); padding: 2px 0; }
.hp-gif img { display: block; width: 100%; height: auto; margin-top: 8px; border: 1px solid var(--line); border-radius: var(--r); cursor: zoom-in; }
.hp-gif-hint { display: block; margin-top: 4px; font-size: 0.78rem; color: var(--muted); }
.hp-zoom { padding: 0; border: 0; background: transparent; max-width: min(96vw, 1200px); max-height: 94vh; overflow: visible; }
.hp-zoom::backdrop { background: rgba(16, 27, 37, 0.82); }
.hp-zoom img { display: block; width: 100%; height: auto; max-height: 86vh; object-fit: contain; border-radius: var(--r); background: #fff; cursor: zoom-out; }
.hp-zoom p { margin: 8px 0 0; max-width: none; color: #F5F3EF; font-size: 0.86rem; text-align: center; }