/* 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,.field .flabel{font-size:14px;color:var(--muted);font-weight:600}
.req{color:var(--compression);font-weight:700}
.photo-grid.staged{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));margin:4px 0 8px}
.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}
.photo-panel{margin:0 0 18px;padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--c, var(--tape));border-radius:var(--r-card);background:var(--surface-2)}
.photo-panel h3{margin:0 0 6px}
.photo-panel h3:focus{outline:none}
.photo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:10px 0}
.photo{margin:0}
.photo .ph-img{aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;background:var(--paper);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.photo .ph-img img{width:100%;height:100%;object-fit:cover;display:block}
.photo figcaption{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:6px;font-size:14px;color:var(--muted)}
.photo-panel .ph-foot{justify-content:space-between}
.photo-panel .btnrow .btn svg{vertical-align:-3px}
.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 ---------- */

/* tests a coach logged, and the team leaderboard */
.pill.coach{background:var(--tape-soft);color:var(--rust-deep);border-color:var(--tape)}
.log-table tr.coach-row td{background:color-mix(in srgb, var(--tape) 5%, var(--paper))}
.board tr.me td{background:var(--tape-soft)}
.board td:nth-child(2){white-space:nowrap}

/* "are you sure?" before deleting */
dialog.bl-confirm{width:min(440px,calc(100vw - 32px));border:1px solid var(--line);border-radius:var(--r-card);background:var(--paper);color:var(--ink);padding:0;box-shadow:var(--shadow)}
dialog.bl-confirm::backdrop{background:rgba(10,12,20,.5)}
.bl-confirm .blc-in{padding:22px 20px 18px}
.bl-confirm h2{font-size:22px;margin:0 0 8px}
.bl-confirm p{margin:0;line-height:1.5}
.bl-confirm .blc-btns{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px;margin-top:20px}
.btn.ghost.danger{color:var(--bad);border-color:var(--bad)}

/* video links shown as thumbnails (Start page): two side by side at every
   width. A card wide enough puts its thumbnail beside the text; a narrow one
   (phones) shows the thumbnail and title only. */
.video-row{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
a.video-card{container-type:inline-size;display:block;padding:10px;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow);text-decoration:none;color:var(--ink)}
a.video-card:hover{border-color:var(--tape)}
a.video-card:focus-visible{outline:3px solid var(--tape);outline-offset:2px}
.vc-in{display:flex;flex-direction:column;gap:8px;height:100%}
.vc-thumb{position:relative;display:block;flex:none;aspect-ratio:16/9;border-radius:6px;overflow:hidden;background:var(--tile)}
.vc-thumb img{display:block;width:100%;height:100%;object-fit:cover}
.vc-play{position:absolute;left:6px;bottom:6px;width:30px;height:30px;border-radius:50%;background:rgba(10,12,20,.72);display:flex;align-items:center;justify-content:center}
.vc-play svg{width:20px;height:20px;fill:#FFFFFF}
a.video-card:hover .vc-play{box-shadow:0 0 0 3px var(--tape)}
.vc-body{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}
.vc-kicker{font-family:var(--f-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;font-weight:600;color:var(--tape)}
.vc-title{font-family:var(--f-display);font-size:16px;font-weight:600;line-height:1.25}
.vc-text{font-size:14px;line-height:1.45;color:var(--muted)}
.vc-meta{margin-top:auto;padding-top:2px;font-size:13px;font-weight:600;color:var(--rust)}
.vc-kicker,.vc-text{display:none}
@container (min-width:300px){
  .vc-in{flex-direction:row;align-items:center;gap:14px}
  .vc-thumb{width:min(150px,40%)}
  .vc-kicker,.vc-text{display:block}
  .vc-title{font-size:17px}
}

/* ---------- 2027 overview (overview.html, from the team's slides) ---------- */
.ov{padding-top:24px}
.ov-hero h1{font-size:clamp(38px,8vw,54px);margin:6px 0 10px}
.ov-kicker{display:block;font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--tape)}
.ov-sec{margin:44px 0 0}
.ov-sec h2{font-size:clamp(26px,5vw,32px);margin:4px 0 16px}
.ov-sec h3{font-size:17px;margin:0 0 6px}
.ov-sec p{max-width:74ch;line-height:1.6}
.ov-tiles{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
.ov-tiles.three{grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){ .ov-tiles,.ov-tiles.three{grid-template-columns:repeat(3,minmax(0,1fr))} }
.ov-tile,.ov-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);padding:16px 18px}
.ov-tile>b{display:block;font-family:var(--f-display);font-size:22px;font-weight:700;color:var(--tape);margin:0 0 4px}
.ov-tile p,.ov-card p{margin:0;font-size:15px;color:var(--muted)}
.ov-card p+p,.ov-card svg+p{margin-top:6px}
.ov-num.c{color:var(--compression)}
.ov-num.t{color:var(--tension)}
.ov-two{display:grid;gap:16px;grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){ .ov-two{grid-template-columns:repeat(2,minmax(0,1fr))} }
.ov-fig{margin:0;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);padding:14px}
.ov-fig svg{display:block;width:100%;height:auto}
.ov-fig figcaption{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.5}
.ov-fig figcaption .t{color:var(--tension);font-weight:600}
.ov-fig figcaption .c{color:var(--compression);font-weight:600}
.ov-formula{display:flex;flex-wrap:wrap;gap:4px 28px;align-items:baseline;margin:12px 0 0;padding:10px 14px;background:var(--tape-soft);border-left:4px solid var(--tape);border-radius:0 10px 10px 0}
.ov-sec .ov-formula p{margin:0;max-width:none;font-family:var(--f-mono);font-size:15px;color:var(--ink)}
.ov-sec .ov-formula p.key{flex-basis:100%;font-family:var(--f-body);font-size:13.5px;color:var(--muted)}
.ov-sec .ov-formula + p{margin-top:12px}
.ov-formula .t{color:var(--tension);font-weight:700}
.ov-formula .c{color:var(--compression);font-weight:700}
.ov-key{font-size:13px;color:var(--muted);margin:10px 0 0}
.ov-more{margin:12px 0 0;font-weight:600}
.ov-kgf{display:grid;gap:16px;grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){ .ov-kgf{grid-template-columns:3fr 2fr} }
.ov-def{border-left:4px solid var(--tape);background:var(--tape-soft);padding:10px 14px;border-radius:0 10px 10px 0;margin:0 0 14px}
.ov-buckets{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.ov-buckets li{display:flex;gap:14px;align-items:center}
.ov-buckets li>svg{flex:none;width:110px;height:auto}
.ov-buckets li.t>svg{fill:var(--tension);stroke:var(--tension)}
.ov-buckets li.c>svg{fill:var(--compression);stroke:var(--compression)}
.ov-buckets b{display:block;font-family:var(--f-display);font-size:20px}
.ov-buckets li.t b{color:var(--tension)}
.ov-buckets li.c b{color:var(--compression)}
.ov-buckets span{font-size:14.5px;color:var(--muted);font-weight:400}
.ov-card svg{display:block;width:100%;max-width:240px;height:auto;margin:6px 0}
.ov-grid2{display:grid;gap:12px;grid-template-columns:minmax(0,1fr)}
@media (min-width:640px){ .ov-grid2{grid-template-columns:repeat(2,minmax(0,1fr))} }
.ov-plan{margin-top:12px;background:var(--tape);color:#FFFFFF;border-radius:var(--r-card);padding:14px 18px}
.ov-plan b{display:block;font-size:16px}
.ov-plan p{margin:2px 0 0;color:inherit;max-width:none}
@media (prefers-color-scheme:dark){ :root:not([data-theme="light"]) .ov-plan{color:#0B1220} }
:root[data-theme="dark"] .ov-plan{color:#0B1220}
.ov-watch{display:grid;gap:16px;grid-template-columns:minmax(0,1fr);align-items:center}
@media (min-width:720px){ .ov-watch{grid-template-columns:3fr 2fr} }
.ov-watch ul{margin:0;padding-left:20px;line-height:1.7}
.ov .keepgoing{margin-top:48px}
a.card.ov-link{margin:0 0 40px}
@media (max-width:600px){ a.card.ov-link{margin-bottom:30px} }
.ov-link .mark{color:var(--tape)}
@media (max-width:600px){ .ov-fig svg.side{overflow:visible} .ov-fig svg.side text{font-size:21px} .ov-fig svg.side text.wl{font-size:15px} }

/* the overview as a slide show (BL.deck). Without the script the slides stack. */
.deck .slide{margin:0 0 20px;background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:clamp(20px,4vw,44px)}
.deck .slide h2{margin-top:4px}
.deck .slide .ov-tile,.deck .slide .ov-card,.deck .slide .ov-fig{background:var(--surface-2)}
.deck .slide.title{background:#172024;border-color:#172024;color:#F3F1EC;display:flex;flex-direction:column;justify-content:center}
.deck .slide.title .ov-kicker{color:#9DB8FF}
.deck .slide.title h1{color:#F3F1EC;font-size:clamp(44px,8vw,72px);margin:8px 0 14px}
.deck .slide.title .lede{color:#C9CFD3;font-size:clamp(17px,2.4vw,21px)}
.deck.on .deck-track{display:grid}
.deck.on .slide{grid-area:1/1;margin:0;transition:opacity .25s ease}
.deck.on .slide.off{visibility:hidden;opacity:0}
@media (min-width:900px){ .deck .slide{aspect-ratio:16/9;display:flex;flex-direction:column;justify-content:center} }
@media (prefers-reduced-motion:reduce){ .deck.on .slide{transition:none} }
.deck-bar{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;margin:14px 0 0}
.deck-bar[hidden]{display:none}
.deck-bar .btn:disabled{opacity:.4;cursor:default}
.deck-dots{display:flex;gap:2px;flex-wrap:wrap;justify-content:center}
.deck-dot{width:24px;height:24px;border:0;background:none;padding:0;cursor:pointer;display:grid;place-items:center}
.deck-dot::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--line);transition:background .15s}
.deck-dot[aria-current="true"]::before{background:var(--tape);width:11px;height:11px}
.deck-dot:focus-visible{outline:2px solid var(--tape);outline-offset:1px;border-radius:50%}
.deck-count{font-family:var(--f-mono);font-size:13px;color:var(--muted);min-width:44px;text-align:center}
.deck:fullscreen{background:var(--bg);padding:24px;display:flex;flex-direction:column;justify-content:center;align-items:center;overflow:auto}
.deck:fullscreen .deck-track{margin:0 auto}
.deck:fullscreen .slide{aspect-ratio:16/9;display:flex;flex-direction:column;justify-content:center}
@media (max-width:600px){
  .deck-bar{position:sticky;bottom:0;z-index:2;background:var(--bg);margin:0;padding:8px 0 10px;border-top:1px solid var(--line);gap:6px 10px}
  .deck-dots{order:-1;width:100%}
  .deck-count{order:1}
  .deck-bar [data-go="1"]{order:2}
  .deck-bar .deck-full{display:none}
}

/* The slide show on phones: every slide the same height (the tallest), so the
   frame and the buttons stay put, and each slide laid out to fit one screen:
   no boxes inside the slide, rows instead of tiles, diagrams sized to fit. */
@media (max-width:600px){
  .deck .slide{padding:18px 16px;border-radius:14px}
  .deck .slide .ov-kicker{font-size:11px}
  .deck .slide h2{font-size:22px;margin:2px 0 12px;line-height:1.2}
  .deck .slide h3{font-size:15px;margin:0 0 2px}
  .deck .slide p{font-size:14px;line-height:1.45}
  .deck .slide.title{justify-content:center}
  .deck .slide.title h1{font-size:40px}
  .deck .slide .ov-tile,.deck .slide .ov-card,.deck .slide .ov-fig{background:none;border:0;border-radius:0;padding:0}
  /* tiles become rows: the number on the left, the words on the right */
  .deck .ov-tiles,.deck .ov-tiles.three{grid-template-columns:minmax(0,1fr);gap:0}
  .deck .ov-tile{display:grid;grid-template-columns:92px minmax(0,1fr);gap:2px 12px;align-items:baseline;padding:8px 0 !important;border-top:1px solid var(--line) !important}
  .deck .ov-tile:first-child{border-top:0 !important;padding-top:0 !important}
  .deck .ov-tile>b{font-size:17px;margin:0}
  .deck .ov-tile p{font-size:13.5px}
  .deck .ov-tiles.three .ov-tile{grid-template-columns:minmax(0,1fr)}
  .deck .ov-tiles.three .ov-tile>b{display:inline;margin-right:6px}
  .deck .ov-tiles.three .ov-tile h3{display:inline;font-size:14.5px}
  .deck .ov-plan{padding:10px 14px;margin-top:10px}
  .deck .ov-plan b{font-size:14.5px}
  .deck .ov-more{margin-top:8px;font-size:14px}
  /* the one change: both side views, short */
  .deck #change .ov-two{gap:10px}
  .deck #change .ov-fig svg{max-height:118px}
  .deck .ov-fig figcaption{font-size:13px;margin-top:4px}
  .deck .ov-key{font-size:12px;margin-top:6px}
  /* forces: two side views, sized to fit */
  .deck #forces .ov-two{gap:8px}
  .deck #forces .ov-fig h3{margin:0}
  .deck #forces .ov-fig svg{max-height:168px}
  .deck #forces p{margin:6px 0 0}
  /* kgf: smaller buckets, the two ropes side by side */
  .deck .ov-kgf{gap:10px}
  .deck .ov-def{padding:8px 12px;margin:0 0 10px;font-size:14px}
  .deck .ov-buckets{gap:8px}
  .deck .ov-buckets li{gap:10px}
  .deck .ov-buckets li>svg{width:74px}
  .deck .ov-buckets b{font-size:16px}
  .deck .ov-buckets span{font-size:13px;line-height:1.35;display:block}
  .deck #kgf .ov-card{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 12px;border-top:1px solid var(--line);padding-top:10px}
  .deck #kgf .ov-card h3{grid-column:1/-1}
  .deck #kgf .ov-card svg{grid-row:2;margin:2px 0;max-height:46px}
  .deck #kgf .ov-card p{font-size:13px;margin:0}
  .deck #kgf .ov-card p:last-child{grid-column:1/-1;margin-top:4px}
  /* buckling, carry over: rows */
  .deck .ov-grid2{gap:0}
  .deck #carry .ov-card{padding:8px 0;border-top:1px solid var(--line)}
  .deck #carry .ov-card:first-child{border-top:0;padding-top:0}
  /* watch: the video card, then what to watch for */
  .deck .ov-watch{gap:12px}
  .deck .ov-watch ul{font-size:14px;line-height:1.5}
}
@media (min-width:601px){ .deck #forces .ov-fig svg{max-height:225px} .deck #forces .ov-fig h3{margin-bottom:2px} }
@media (max-width:600px){ .deck .slide .ov-formula{margin-top:8px;padding:6px 10px;gap:2px 16px} .deck .slide .ov-formula p{font-size:13px} .deck .slide .ov-formula p.key{font-size:12px;line-height:1.35} .deck .slide .ov-formula .ex{display:none} .deck #forces .ov-fig svg{max-height:126px} .deck #forces p{line-height:1.4} }