/* Boomilever: the course's own components, drawn in the Field Station style
   (fs.css). The page is a shop notebook on cm graph paper: each sheet has a
   drawing title block (dark sheet-number cell, phase, title).

   Course accent: painter's-tape blue, in place of Field Station's rust (it
   would read as a third force color next to compression red). Semantic
   colors, the same in every diagram: tension = teal, compression = red,
   wood = tan. */

:root{
  --rust:#2B5FC7; --rust-deep:#1E4799; --tape:#2B5FC7; --tape-soft:#E2EAFB;
  --tension:#0D7C70; --compression:#C03A24; --wood:#B07A3E; --wood-soft:#F4E8D6;
  --good:#2C7A37; --bad:#B0281F; --warn:#8A5A12;
  --grid:rgba(40,90,130,.075);
  --surface:var(--paper); --surface-2:var(--paper-alt);
  --c-start:#2B5FC7; --c-design:#1F6E73; --c-build:#8A5A12; --c-test:#B03A22; --c-optimize:#6B3FA0;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --rust:#7EA4FF; --rust-deep:#A9C2FF; --tape:#7EA4FF; --tape-soft:#1C2945;
  --tension:#3CC3B0; --compression:#FF7C61; --wood:#D8AD73; --wood-soft:#2C2419;
  --good:#71C97D; --bad:#FF8C80; --warn:#E3B04B;
  --grid:rgba(140,190,230,.06);
  --c-start:#7EA4FF; --c-design:#6CC3C7; --c-build:#D9A15B; --c-test:#F2876A; --c-optimize:#C2A2EC;
} }
:root[data-theme="dark"]{
  --rust:#7EA4FF; --rust-deep:#A9C2FF; --tape:#7EA4FF; --tape-soft:#1C2945;
  --tension:#3CC3B0; --compression:#FF7C61; --wood:#D8AD73; --wood-soft:#2C2419;
  --good:#71C97D; --bad:#FF8C80; --warn:#E3B04B;
  --grid:rgba(140,190,230,.06);
  --c-start:#7EA4FF; --c-design:#6CC3C7; --c-build:#D9A15B; --c-test:#F2876A; --c-optimize:#C2A2EC;
}

/* cm graph paper behind every page */
body{background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px}
.t{color:var(--tension);font-weight:700}
.c{color:var(--compression);font-weight:700}
.num{font-family:var(--f-mono);font-variant-numeric:tabular-nums}

/* ---------- phase pages ---------- */
.bguide{gap:40px}
.bguide .guide-head .lede{margin:0}
.bguide p,.bguide li{color:var(--ink-2)}
.bguide b,.bguide strong{color:var(--ink)}
.toc .phases{margin:18px 0 0;padding:14px 0 0;border-top:1px solid var(--line)}
.toc .phases a .n{font-family:var(--f-mono);font-size:11px;color:var(--muted);margin-left:auto}
.toc a .sn{flex:none;font-family:var(--f-mono);font-size:11px;font-weight:600;color:var(--muted);min-width:28px}

/* sheet: a plan sheet with a drawing title block */
.sheet{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow);overflow:hidden;scroll-margin-top:16px}
.tb{display:flex;align-items:stretch;border-bottom:1.5px solid var(--slate)}
.tb .sheetno{flex:none;min-width:86px;display:flex;flex-direction:column;justify-content:center;padding:10px 16px;background:var(--slate);color:var(--on-slate);font-family:var(--f-mono);font-weight:600;font-size:17px}
.tb .sheetno small{font-size:10px;letter-spacing:.12em;text-transform:uppercase;opacity:.8}
.tb .ttl{flex:1;min-width:0;padding:10px 18px}
.tb .phn{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--c,var(--rust))}
.tb h2{font-size:28px;margin:2px 0 0}
.sheet-body{padding:22px 26px 26px}
.sheet-body>p,.sheet-body>ul,.sheet-body>ol{max-width:70ch}
.sheet-body p,.sheet-body li{font-size:16px;line-height:1.65}
.sheet-body h3{font-size:21px;margin:28px 0 8px}
.sheet-body ul,.sheet-body ol{padding-left:22px}
.sheet-body li+li{margin-top:4px}
@media (max-width:600px){ .sheet-body{padding:16px} .tb h2{font-size:22px} .tb .sheetno{min-width:64px;padding:8px 12px;font-size:15px} .tb .ttl{padding:8px 12px} }

/* sheet end: mark it done */
.sheet-end{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:14px 26px;border-top:1px dashed var(--line);background:var(--paper-alt)}
.sheet-end p{margin:0;font-size:14px;color:var(--muted)}
.sheet-end .btn{min-height:40px;padding:8px 16px;font-size:14px}
.sheet-end.is-done p{color:var(--good)}
@media (max-width:600px){ .sheet-end{padding:12px 16px} }

/* ---------- start: hero ---------- */
.loop{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:16px 0 0;padding:0;list-style:none}
.loop li{font-family:var(--f-mono);font-weight:600;font-size:12px;letter-spacing:.1em;text-transform:uppercase;padding:6px 12px;border:1.5px solid var(--slate);border-radius:6px;background:var(--paper);color:var(--slate)}
.loop li.arrow{border:0;background:none;padding:0 2px;color:var(--muted);font-size:15px;letter-spacing:0}

/* ---------- figures and diagrams ---------- */
.figure{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px;margin:0}
.figure svg{display:block;width:100%;height:auto}
.figcap{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.5}
svg text{font-family:var(--f-mono)}
/* Diagram text scales up on phones; the labels left of the wall stay a bit
   smaller so they fit beside it. */
@media (max-width:600px){ .figure svg.side{overflow:visible} .figure svg.side text{font-size:21px} .figure svg.side text.wl{font-size:15px} }
.gallery{margin:14px 0}
.gallery img{width:100%;height:auto;display:block;border-radius:12px;border:1px solid var(--line)}

/* ---------- callouts ---------- */
.callout{border-left:4px solid var(--tape);background:var(--tape-soft);color:var(--ink);padding:12px 16px;border-radius:0 12px 12px 0;margin:16px 0;max-width:74ch;font-size:15.5px;line-height:1.6}
.callout.wood{border-left-color:var(--wood);background:var(--wood-soft)}
.callout.warn{border-left-color:var(--ochre);background:var(--tint-ochre-bg);color:var(--tint-ochre-ink)}
.callout.warn b,.callout.warn strong{color:inherit}
.callout>b:first-child{font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
td.rule{font-family:var(--f-mono);font-size:12.5px;color:var(--muted);white-space:nowrap}
.sheet-body .tbl-wrap{margin:12px 0 18px;position:relative}
.tbl th{white-space:nowrap}

/* ---------- interactive tools ---------- */
.tool{background:var(--paper-alt);border:1.5px solid var(--slate);border-radius:14px;padding:18px 20px;margin:20px 0}
.tool>.tool-name{display:flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--slate);margin:0 0 12px}
.tool>.tool-name::before{content:"";width:12px;height:12px;border:2px solid var(--tape);border-radius:2px;background:var(--tape-soft)}
.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px 16px}
.field{display:flex;flex-direction:column;gap:4px;min-width:0}
.field label{font-size:14px;color:var(--muted);font-weight:600}
.field output{font-family:var(--f-mono);font-weight:600;color:var(--ink)}
.field .input{min-height:42px;padding:8px 12px;font-size:15.5px}
.field.wide{grid-column:1/-1}
input[type=range]{width:100%;min-height:32px;accent-color:var(--tape)}
.results{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px}
.rstat{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:10px 14px;min-width:130px;flex:1 1 130px}
.rstat .v{font-family:var(--f-mono);font-weight:600;font-size:23px;font-variant-numeric:tabular-nums;line-height:1.25;color:var(--ink)}
.rstat .v.sm{font-size:17px}
.rstat .k{font-size:13px;color:var(--muted)}
.rstat.ten .v{color:var(--tension)} .rstat.com .v{color:var(--compression)}
.rstat.hl{border-color:var(--tape);box-shadow:inset 0 0 0 1px var(--tape)}
.note{font-size:14px;color:var(--muted);margin:10px 0 0;line-height:1.55}
.btnrow{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;align-items:center}
.btn.sm{min-height:36px;padding:6px 12px;font-size:14px}

/* buckling bars */
.mbars{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.mbar{display:grid;grid-template-columns:170px minmax(0,1fr) 96px;gap:10px;align-items:center;font-size:14.5px}
.mbar .track{height:16px;background:var(--paper);border:1px solid var(--line);border-radius:4px;position:relative;overflow:hidden}
.mbar .fill{position:absolute;inset:0 auto 0 0;background:var(--compression);opacity:.85;border-radius:3px}
.mbar .fill.ok{background:var(--good)}
.mbar .need{position:absolute;top:-3px;bottom:-3px;width:2px;background:var(--ink)}
.mbar.weak .name{font-weight:700;color:var(--ink)}
.mbar .val{font-family:var(--f-mono);text-align:right}
@media (max-width:560px){ .mbar{grid-template-columns:minmax(0,1fr) 88px} .mbar .track{grid-column:1/-1;order:3} }

/* numbered steps (build sequence, test protocol) */
.bsteps{list-style:none;padding:0 !important;margin:14px 0;counter-reset:s;display:flex;flex-direction:column;gap:12px;max-width:none !important}
.bsteps>li{counter-increment:s;display:grid;grid-template-columns:44px minmax(0,1fr);gap:14px;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--paper)}
.bsteps>li+li{margin-top:0}
.bsteps>li::before{content:counter(s);font-family:var(--f-display);font-weight:700;font-size:21px;color:var(--slate);width:40px;height:40px;display:grid;place-items:center;border:2px solid var(--slate);border-radius:50%}
.bsteps h4{margin:0 0 4px;font-size:19px}
.bsteps p{margin:.3rem 0}
@media (max-width:480px){ .bsteps>li{grid-template-columns:34px minmax(0,1fr);gap:10px;padding:12px} .bsteps>li::before{width:32px;height:32px;font-size:17px} }
.record{display:inline-flex;align-items:center;gap:6px;font-family:var(--f-mono);font-weight:600;letter-spacing:.06em;text-transform:uppercase;font-size:11px;background:var(--wood-soft);color:var(--ink);border:1px dashed var(--wood);padding:2px 8px;border-radius:4px;margin-top:4px}
.record::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--wood)}

/* family and buckling-mode cards */
.fam{border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--paper);display:flex;flex-direction:column;gap:6px}
.fam svg{width:100%;height:auto;background:var(--paper-alt);border-radius:6px}
.fam h4{margin:4px 0 0;font-size:18px}
.fam p{margin:0;font-size:14.5px;line-height:1.5}
.fam .pc b{font-family:var(--f-mono);letter-spacing:.04em;text-transform:uppercase;font-size:11px}

/* what broke? */
.symptoms{display:flex;flex-wrap:wrap;gap:8px}
.symptoms .chip{font-family:var(--f-body);font-size:14.5px;text-align:left}
.diag{margin-top:14px;border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:16px 18px}
.diag h4{margin:0 0 8px;font-size:20px}
.diag dl{display:grid;grid-template-columns:130px minmax(0,1fr);gap:8px 14px;margin:0}
.diag dt{font-family:var(--f-mono);text-transform:uppercase;letter-spacing:.06em;font-size:11.5px;color:var(--muted);padding-top:4px}
.diag dd{margin:0;line-height:1.6}
@media (max-width:560px){ .diag dl{grid-template-columns:minmax(0,1fr);gap:2px} .diag dd{margin-bottom:8px} }

/* checklist */
.cl{list-style:none;padding:0 !important;margin:10px 0;display:flex;flex-direction:column;gap:6px;max-width:none !important}
.cl li+li{margin-top:0}
.cl label{display:grid;grid-template-columns:22px minmax(0,1fr) auto;gap:10px;align-items:start;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--paper);cursor:pointer;line-height:1.5}
.cl input{width:18px;height:18px;margin-top:3px;accent-color:var(--good)}
.cl .rule{font-family:var(--f-mono);font-size:12px;color:var(--muted);padding-top:2px}
.cl label:has(input:checked){background:var(--good-bg);border-color:var(--moss)}
@media (max-width:480px){ .cl label{grid-template-columns:22px minmax(0,1fr)} .cl .rule{grid-column:2} }
.meter{height:10px;background:var(--paper-alt);border:1px solid var(--line);border-radius:999px;overflow:hidden;margin:8px 0}
.meter>div{height:100%;background:var(--good);width:0}

/* build log */
.log-table td,.log-table th{white-space:nowrap}
.log-table td.notes{white-space:normal;min-width:200px}
.pill.ok{background:var(--good-bg);color:var(--good-ink);border-color:var(--moss)}
.pill.no,.pill.t2{background:var(--bad-bg);color:var(--bad-ink);border-color:var(--tint-rust-line)}
.pill.ex{background:var(--tint-ochre-bg);color:var(--tint-ochre-ink);border-color:var(--tint-ochre-line)}
.pill.base{background:var(--paper-alt);color:var(--muted);border-color:var(--line)}
.chart{margin-top:16px;overflow-x:auto}
.chart svg{display:block;min-width:480px;width:100%;height:auto}
.chart-title{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--muted);margin-bottom:4px}
.addform{margin-top:16px;border-top:1px dashed var(--line);padding-top:16px}
textarea.input{font-family:var(--f-mono);font-size:13px;min-height:120px}
.saved-note{display:flex;gap:8px;align-items:flex-start}

/* check yourself */
.bguide .check-panel{margin-top:6px}
.qhead{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--muted);margin-bottom:10px}

/* ---------- home ---------- */
.devnote{display:flex;gap:12px;align-items:flex-start;background:var(--tint-ochre-bg);color:var(--tint-ochre-ink);border:1px solid var(--tint-ochre-line);border-radius:12px;padding:12px 16px;margin:0 0 26px;font-size:14.5px;line-height:1.5}
.devnote b{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;display:block;margin-bottom:2px}