/* Bike "trailhead" theme (2026-10-29). Site-local; system fonts only, no CDNs. Forest green + sunrise orange + sand. */
:root{--forest:#17402f;--pine:#24614a;--moss:#dfe9d8;--sun:#ff6a2b;--sun-d:#d9480f;--amber:#ffb238;--sand:#f7f2e8;--chalk:#fffdf8;--ink:#1d2420;--muted:#56605a;--line:#e6dccb;--sky:#2f7fa8;
--display:"Avenir Next Condensed","Roboto Condensed","Arial Narrow","Helvetica Neue",system-ui,sans-serif;--sans:"Avenir Next",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
--r:16px;--sh:0 12px 28px rgba(23,64,47,.10),0 2px 6px rgba(23,64,47,.06)}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font:17px/1.6 var(--sans);color:var(--ink);background:var(--sand)}
img{max-width:100%;height:auto;display:block}
a{color:var(--pine);text-decoration-color:var(--sun);text-decoration-thickness:2px;text-underline-offset:3px}a:hover{color:var(--sun-d)}
h1,h2,h3{font-family:var(--display);color:var(--forest);font-weight:800;line-height:1.08;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,7vw,3.6rem);margin:.25em 0 .3em;text-transform:uppercase}
h2{font-size:clamp(1.55rem,4.2vw,2.3rem);margin:1.5em 0 .45em}h3{font-size:1.2rem;margin:.4em 0}
.skip{position:absolute;left:-999px;top:0;background:var(--forest);color:#fff;padding:8px 14px;z-index:9}.skip:focus{left:8px}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}
.center{text-align:center}
/* header */
.top{position:sticky;top:0;z-index:5;background:rgba(255,253,248,.95);backdrop-filter:saturate(1.4) blur(8px);border-bottom:3px solid var(--sun)}
.top .in{max-width:1180px;margin:0 auto;padding:8px 18px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:4px 18px}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--forest);font-family:var(--display);font-weight:900;font-size:1.7rem;letter-spacing:-.02em;text-transform:uppercase}
.top nav{display:flex;gap:4px 16px;flex-wrap:wrap;font-size:.9rem;font-weight:600}
.top nav a{text-decoration:none;color:var(--ink);padding:6px 2px;border-bottom:3px solid transparent;white-space:nowrap}
.top nav a:hover{border-bottom-color:var(--sun);color:var(--forest)}
@media(max-width:700px){.top nav{width:100%;flex-wrap:nowrap;overflow-x:auto;gap:14px;padding-bottom:2px;font-size:.84rem;scrollbar-width:none}.brand{font-size:1.45rem}}
main{max-width:1180px;margin:0 auto;padding:0 18px 40px}
/* shared bits */
.card{background:var(--chalk);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh)}
.eyebrow{font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;color:var(--sun-d);font-weight:800;margin:0}
.btn{display:inline-block;background:var(--sun);color:#fff;text-decoration:none;padding:13px 24px;border-radius:999px;font-weight:800;font-size:1rem;box-shadow:0 8px 18px rgba(217,72,15,.25);margin:4px 8px 4px 0;letter-spacing:.01em}
.btn:hover{background:var(--sun-d);color:#fff}.btn.ghost{background:transparent;color:var(--forest);border:2px solid var(--forest);box-shadow:none}.btn.ghost:hover{background:var(--forest);color:#fff}
.btn.small{padding:9px 18px;font-size:.92rem}
sup.cite{font-size:.66rem;color:var(--muted);font-family:var(--sans);white-space:nowrap;font-weight:500}sup.cite a{text-decoration:none;color:var(--sky);font-weight:700}
.sh{font-style:italic}.unverified{font-size:.9rem;color:#7a3a00;font-style:italic;background:#fff1e0;border-radius:8px;padding:2px 8px}
.aff-note{font-size:.88rem;color:var(--muted)}
.src{font-size:.85rem;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;margin-top:40px}
.fine{font-size:.84rem;color:var(--muted)}
/* tables */
.wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:14px 0;border-radius:12px;border:1px solid var(--line);background:var(--chalk)}
table{border-collapse:collapse;width:100%;font-size:.95rem;min-width:420px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--forest);color:#fff;font-weight:700;font-size:.88rem;letter-spacing:.02em}thead th sup.cite a{color:var(--amber)}thead th sup.cite{color:#cfe0d6}
tbody tr:nth-child(even){background:#faf6ee}tbody tr:last-child td,tbody tr:last-child th{border-bottom:0}
table.compact{min-width:0}
/* hero */
.hero{display:grid;gap:18px;padding-top:16px}
.hero-photo{border-radius:22px;overflow:hidden;box-shadow:var(--sh);aspect-ratio:16/9;background:var(--moss)}
.hero-photo img{width:100%;height:100%;object-fit:cover}
.hero h1 span{color:var(--sun)}
.lede{font-size:1.1rem;color:#333d37;max-width:36em}
@media(min-width:980px){.hero{grid-template-columns:1fr 1.15fr;align-items:center;gap:36px;padding-top:30px}.hero-copy{order:1}.hero-photo{order:2}}
/* finder */
.finder{background:var(--forest);color:#f3efe6;border-radius:22px;padding:22px 18px 18px;margin:26px 0 10px;box-shadow:0 18px 40px rgba(23,64,47,.25);position:relative}
.finder h2{color:#fff;margin:0 0 4px}.finder-head{display:flex;gap:14px;align-items:center}.finder-head p{margin:0;color:#cfe0d6}
.finder .ic{width:58px;height:54px;color:var(--amber);flex:none}
.fgrid{display:grid;gap:12px;margin:18px 0 6px;border:0;padding:0}
@media(min-width:760px){.fgrid{grid-template-columns:auto 1.2fr 1fr 1fr;align-items:end}}
.fgrid label{display:block;font-weight:700;font-size:.9rem;margin-bottom:5px;color:#fff}.fgrid small{font-weight:500;color:#cfe0d6}
.fgrid input[type=number],.fgrid select{width:100%;font:inherit;font-size:1.05rem;padding:11px 12px;border-radius:10px;border:2px solid transparent;background:#fffdf8;color:var(--ink);min-height:48px}
.fgrid input:focus,.fgrid select:focus{border-color:var(--amber);outline:none}
.pair{display:flex;gap:8px}
.seg{border:0;padding:0;margin:0;display:flex;gap:0;flex-wrap:wrap}.seg legend{font-weight:700;font-size:.9rem;margin-bottom:5px;color:#fff;padding:0}
.seg label{margin:0}.seg input{position:absolute;opacity:0}.seg span{display:inline-block;padding:11px 16px;background:rgba(255,255,255,.1);border:2px solid rgba(255,255,255,.25);cursor:pointer;font-weight:700;min-height:48px}
.seg label:first-of-type span{border-radius:10px 0 0 10px}.seg label:last-of-type span{border-radius:0 10px 10px 0}
.seg input:checked+span{background:var(--sun);border-color:var(--sun);color:#fff}.seg input:focus-visible+span{outline:3px solid var(--amber)}
#f-out{display:block;background:var(--chalk);color:var(--ink);border-radius:16px;padding:18px;margin-top:14px;min-height:120px}
#f-out a{color:var(--pine)}
.res-top{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px}.res-label{font-size:.8rem;text-transform:uppercase;letter-spacing:.14em;font-weight:800;color:var(--sun-d)}
.res-size{font-family:var(--display);font-weight:900;font-size:clamp(2.2rem,8vw,3.2rem);color:var(--forest);line-height:1}
.res-sub{font-size:1.05rem;font-weight:600;margin:6px 0 10px}
.res-list{margin:8px 0;padding-left:1.1em}.res-list li{margin:4px 0}
.when{font-size:.78rem;color:var(--muted)}
.res-warn{background:#fff1e0;border-left:4px solid var(--sun);padding:10px 12px;border-radius:8px;margin:12px 0 0;font-size:.95rem}
.res-empty{margin:0;color:var(--muted)}
.finder .fine{color:#cfe0d6;margin:12px 2px 0}
/* type cards */
.types h2{margin-top:.3em}.types{padding-top:30px}
.type-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}
@media(min-width:800px){.type-grid{grid-template-columns:repeat(5,1fr)}}
.type{display:flex;flex-direction:column;gap:4px;background:var(--chalk);border:1px solid var(--line);border-radius:var(--r);padding:16px;text-decoration:none;color:var(--ink);box-shadow:var(--sh);transition:transform .15s,border-color .15s}
.type:hover{transform:translateY(-3px);border-color:var(--sun);color:var(--ink)}
.type .ic{width:56px;height:52px;color:var(--pine)}.type strong{font-family:var(--display);font-size:1.3rem;color:var(--forest);text-transform:uppercase}.type span{font-size:.9rem;color:var(--muted)}
/* glance */
.glance{display:grid;gap:10px;padding:20px;margin:40px 0}.glance h2{margin:.2em 0}
@media(min-width:900px){.glance{grid-template-columns:.8fr 1.2fr;align-items:center;gap:30px;padding:30px}}
/* split sections */
.split{display:grid;gap:20px;margin:40px 0;align-items:center}
.split h2{margin-top:.2em}
.split-photo{margin:0;border-radius:20px;overflow:hidden;box-shadow:var(--sh);aspect-ratio:4/3;background:var(--moss)}.split-photo img{width:100%;height:100%;object-fit:cover}
@media(min-width:900px){.split{grid-template-columns:1fr 1.1fr;gap:40px}.kids-band .split-photo{order:2}}
.checks{list-style:none;padding:0}.checks li{padding:8px 0 8px 34px;position:relative;border-bottom:1px dashed var(--line)}
.checks li:before{content:"";position:absolute;left:0;top:11px;width:22px;height:22px;border-radius:50%;background:var(--sun) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12l4 4 8-8' fill='none' stroke='white' stroke-width='3'/%3E%3C/svg%3E") center/16px no-repeat}
/* measure */
.measure{background:var(--moss);border-radius:22px;padding:26px 18px;margin:40px 0}.measure h2{margin-top:.2em}
.step-grid{list-style:none;padding:0;display:grid;gap:12px;margin:18px 0}
@media(min-width:800px){.step-grid{grid-template-columns:repeat(3,1fr)}}
.step-grid li{background:var(--chalk);border-radius:var(--r);padding:18px;box-shadow:var(--sh)}.step-grid p{margin:.3em 0 0;color:var(--muted)}
.num{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--forest);color:var(--amber);font-family:var(--display);font-weight:900;font-size:1.3rem;margin-right:10px}
/* guide list */
.guide-list{list-style:none;padding:0;display:grid;gap:10px;margin:18px 0}
@media(min-width:760px){.guide-list{grid-template-columns:1fr 1fr}}
.guide{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--chalk);border:1px solid var(--line);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--forest);font-weight:700;min-height:56px}
.guide:after{content:"→";color:var(--sun);font-size:1.3rem}.guide:hover{border-color:var(--sun);color:var(--sun-d)}
/* guide pages */
body.page main{max-width:860px}
body.page main>h1{margin-top:.6em}
.kicker{font-family:var(--display);font-size:1.3rem;font-weight:700;color:var(--sun-d);margin:0 0 .8em;line-height:1.25}
.page-photo{margin:22px 0;border-radius:18px;overflow:hidden;background:var(--moss);box-shadow:var(--sh)}
.page-photo img{width:100%;aspect-ratio:4/3;object-fit:cover}.page-photo figcaption{font-size:.78rem;color:var(--muted);padding:6px 12px;background:var(--chalk)}
.cta-box{background:var(--forest);color:#f3efe6;border-radius:14px;padding:14px 18px;margin:18px 0}.cta-box p{margin:0}.cta-box a{color:var(--amber)}
.related{display:flex;flex-wrap:wrap;gap:8px;margin:34px 0 0;align-items:center}.related p{width:100%;margin:0 0 4px;font-weight:800;color:var(--forest);font-family:var(--display);font-size:1.15rem;text-transform:uppercase}
.related a{background:var(--chalk);border:1.5px solid var(--line);border-radius:999px;padding:6px 14px;text-decoration:none;font-weight:600;font-size:.92rem}.related a:hover{border-color:var(--sun)}
ol.steps li,main ul li{margin:6px 0}
/* footer */
.foot{background:var(--forest);color:#d7e3db;margin-top:30px}.foot .in{max-width:1180px;margin:0 auto;padding:30px 18px}
.foot a{color:#fff}.brand-f{display:flex;align-items:center;gap:8px;font-family:var(--display);font-weight:900;font-size:1.4rem;color:#fff;text-transform:uppercase;margin:0 0 8px}
.photo-note{font-size:.85rem;color:#b9cdc1}.foot-nav{font-size:.92rem}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.type{transition:none}}