:root{--bg:#EAEFF0;--paper:#F6F8F8;--ink:#13222C;--mut:#46585F;--brass:#7A5C14;--verd:#2B6A61;--line:#BFCDD1;--btnfg:#fff;--serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif}
@media (prefers-color-scheme:dark){:root{--bg:#0F1B23;--paper:#16252F;--ink:#E6EDEE;--mut:#9FB1B9;--brass:#D2A94B;--verd:#7CC2B5;--line:#2A3D49;--btnfg:#1b1405}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:19px/1.7 var(--serif);text-rendering:optimizeLegibility}
a{color:var(--verd);text-underline-offset:.2em}
a:focus-visible,button:focus-visible{outline:3px solid var(--brass);outline-offset:3px;border-radius:2px}
.wrap{max-width:62rem;margin:0 auto;padding:0 20px}
.col{max-width:40rem}
header.site{border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 28px;padding-top:16px;padding-bottom:16px}
.brand{display:flex;align-items:center;gap:10px;font-size:1.3rem;font-style:italic;color:var(--ink);text-decoration:none}
.brand svg{width:22px;height:22px}
header.site nav{display:flex;flex-wrap:wrap;gap:2px 20px}
header.site nav a{text-decoration:none;color:var(--mut);font-size:1rem}
header.site nav a[aria-current=page]{color:var(--ink);box-shadow:0 2px 0 var(--brass)}
header.site nav a:hover{color:var(--verd)}
h1,h2,h3{font-weight:500;line-height:1.15;letter-spacing:-.01em;margin:0}
h1{font-size:clamp(2.3rem,6vw,3.7rem);margin:1.1em 0 .35em}
h2{font-size:1.7rem;margin:2.2em 0 .5em}
p{margin:0 0 1em}
.lead{font-size:1.25rem;color:var(--mut);max-width:34rem}
.hero{display:grid;gap:28px 40px;grid-template-columns:1fr;align-items:center;padding:12px 0 8px}
@media (min-width:860px){.hero{grid-template-columns:1.05fr .95fr}}
.hero .actions{display:flex;flex-wrap:wrap;gap:14px 26px;align-items:center;margin-top:1.6em}
.instrument{width:100%;max-width:460px;justify-self:center}
.instrument svg,.mini svg{display:block;width:100%;height:auto}
.board{fill:none;stroke:var(--ink);stroke-width:.5}
.board .t{fill:var(--ink);stroke:none}
.board .main{stroke-width:.9}
.board .dot{fill:var(--ink);stroke:none}
.pend line{stroke:var(--brass);stroke-width:.5}
.pend .bob{fill:var(--brass);stroke:none}
.pend .pivot{fill:var(--bg);stroke:var(--brass);stroke-width:.6}
.pend{transform-box:view-box;transform-origin:105px 4px;animation:swing 5.5s ease-in-out infinite alternate}
@keyframes swing{from{transform:rotate(-9deg)}to{transform:rotate(9deg)}}
@media (prefers-reduced-motion:reduce){.pend{animation:none}}
.btn{display:inline-block;background:var(--brass);color:var(--btnfg);padding:11px 22px;border:0;border-radius:3px;text-decoration:none;font:600 1rem var(--serif);cursor:pointer}
.btn:hover{filter:brightness(1.08)}
.index{margin:2.4em 0 0}
.index a.row{display:block;padding:1.1rem 0;border-top:1px solid var(--line);text-decoration:none;color:var(--ink)}
.index h2{font-size:1.15rem;font-style:italic;font-weight:400;color:var(--mut);margin:2.2em 0 .3em}
.index .row h3{font-size:1.7rem;margin:0 0 .15em;font-weight:500}
.index .row p{margin:0;color:var(--mut);max-width:36rem}
.index a.row:hover h3,.index a.row:focus-visible h3{color:var(--verd);text-decoration:underline;text-decoration-color:var(--brass);text-underline-offset:.2em}
dl.pr{display:grid;gap:22px 48px;grid-template-columns:1fr;margin:1.2em 0 0}
@media (min-width:760px){dl.pr{grid-template-columns:1fr 1fr}}
dl.pr dt{font-style:italic;font-size:1.2rem;margin:0 0 .15em}
dl.pr dd{margin:0;color:var(--mut)}
.aside{background:var(--paper);border-left:3px solid var(--brass);padding:14px 20px;margin:1.8em 0;font-size:.98rem}
.aside b{display:block;font-style:italic;font-weight:500;font-size:1.15rem;margin-bottom:.2em}
ol.steps{list-style:none;counter-reset:s;padding:0;margin:1em 0}
ol.steps li{counter-increment:s;position:relative;padding-left:2.6rem;margin:.9em 0}
ol.steps li::before{content:counter(s);position:absolute;left:0;top:-.15em;font-size:1.8rem;line-height:1;color:var(--brass)}
ul{padding-left:1.2rem}
li{margin:.35em 0}
figure{margin:2em 0}
figcaption{color:var(--mut);font-size:.92rem;margin-top:.4em}
.rod{max-width:420px}
.rod svg{width:100%;height:auto;display:block}
.rod .m{stroke:var(--mut);stroke-width:1;fill:none}
.rod .tx{fill:var(--mut);font:14px var(--serif)}
.rod .metal{stroke:var(--brass);stroke-width:5;stroke-linecap:round;stroke-linejoin:round;fill:none}
.rod .tube{fill:var(--verd);opacity:.85}
.dl{display:grid;gap:24px 40px;grid-template-columns:1fr;align-items:center;margin:2em 0;padding:24px 0;border-top:1px solid var(--line)}
@media (min-width:760px){.dl{grid-template-columns:240px 1fr}}
.dl .mini{max-width:240px}
.dl h2{margin:0 0 .3em;font-size:1.6rem}
.fnav{display:flex;flex-wrap:wrap;gap:6px 18px;margin:0 0 .9em}
footer.site{border-top:1px solid var(--line);margin-top:4em;padding:22px 0 34px;color:var(--mut);font-size:.9rem}
footer.site .wrap{max-width:46rem;margin-left:auto;margin-right:auto}
@media (min-width:62rem){footer.site .wrap{margin-left:max(20px,calc((100vw - 62rem)/2));max-width:62rem}}
@media (max-width:480px){body{font-size:17.5px}.lead{font-size:1.1rem}header.site nav{gap:2px 16px}ol.time li{grid-template-columns:3.6rem 1fr}}
@media print{header.site,footer.site,.noprint{display:none}body{background:#fff;color:#000;font-size:12pt}:root{--ink:#000;--mut:#333;--paper:#fff;--line:#999}.wrap{max-width:none}}

details{border-top:1px solid var(--line);padding:.9rem 0}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-size:1.2rem;font-style:italic;list-style:none;padding-right:2rem;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:.2rem;top:0;color:var(--brass);font-style:normal;font-size:1.5rem;line-height:1.2}
details[open] summary::after{content:"\2212"}
details p,details ul{margin-top:.7em}
ol.time{list-style:none;padding:0;margin:1.4em 0}
ol.time li{display:grid;grid-template-columns:4.6rem 1fr;gap:0 14px;padding:.8rem 0;border-top:1px solid var(--line);margin:0}
ol.time li:last-child{border-bottom:1px solid var(--line)}
ol.time b{font-weight:500;font-size:1.25rem;color:var(--brass)}
dl.gl dt{font-size:1.15rem;font-style:italic;margin-top:1.1em}
dl.gl dd{margin:.1em 0 0;color:var(--mut)}
.scroll{overflow-x:auto;margin:1em 0}
table.tbl{width:100%;border-collapse:collapse;font-size:.95rem;min-width:30rem}
table.tbl th,table.tbl td{border:1px solid var(--line);padding:8px 10px;text-align:left;height:2.3rem;vertical-align:top}
table.tbl th{font-weight:500;font-style:italic;background:var(--paper)}
.refs li{margin:.6em 0}
@media print{table.tbl th,table.tbl td{height:9mm;border-color:#666}.scroll{overflow:visible}table.tbl{min-width:0}details{border:0}}

body{hyphens:auto;overflow-wrap:break-word}
header.site .wrap{align-items:center}
.lang{position:relative;margin-left:auto;font-size:.95rem}
details.lang{border:0;padding:0}
.lang summary{cursor:pointer;color:var(--mut);padding:2px 1.3rem 2px 0;font-style:normal;font-size:.95rem}
.lang summary::after{content:"\25BE";right:0;top:1px;font-size:1rem;color:var(--mut)}
.lang[open] summary::after{content:"\25B4"}
.lang ul{position:absolute;right:0;top:1.9rem;z-index:5;list-style:none;margin:0;padding:6px 0;background:var(--paper);border:1px solid var(--line);min-width:10.5rem}
.lang li{margin:0}
.lang a{display:block;padding:6px 16px;text-decoration:none;color:var(--ink)}
.lang a:hover{color:var(--verd)}
.lang a[aria-current]{color:var(--brass)}
@media print{.lang{display:none}}