.usage-heading{max-width:850px;padding:44px 0 50px}.usage-heading h1{font-size:clamp(30px,4vw,48px);line-height:1.3;letter-spacing:-.025em;margin:20px 0}.usage-heading>p:last-child{max-width:760px;color:var(--muted);line-height:1.9}.usage-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:54px;padding-bottom:70px}.usage-nav{align-self:start;position:sticky;top:115px;display:grid;border-top:1px solid var(--line)}.usage-nav a{display:flex;gap:12px;padding:17px 0;border-bottom:1px solid var(--line);font-size:14px}.usage-nav a span{color:var(--green);font-size:12px}.usage-body{min-width:0;max-width:900px}.usage-body>section{scroll-margin-top:15px;padding:8px 0 44px;margin-bottom:32px;border-bottom:1px solid var(--line)}.usage-body h2{font-size:clamp(24px,3vw,32px);line-height:1.45;margin:12px 0 20px}.usage-body h3{font-size:19px;margin:16px 0 10px}.usage-body p{line-height:1.9;color:var(--muted)}.usage-step{font-size:12px;font-weight:650;letter-spacing:1.3px;color:var(--green)}.usage-figure{margin:24px 0}.usage-figure img{display:block;max-width:100%;width:100%;height:auto;border-radius:20px}.usage-figure figcaption,.usage-caption{font-size:13px;color:var(--muted);line-height:1.8;margin-top:12px}.usage-prep-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:24px 0}.usage-prep-grid>div{padding:22px 18px;background:#edf2e7;border-radius:16px}.usage-prep-grid strong{display:block;font-size:23px;color:var(--green);margin-bottom:10px}.usage-prep-grid span{font-size:14px;line-height:1.8;display:block}.usage-checklist{list-style:none;margin:24px 0;padding:0;display:grid;gap:14px}.usage-checklist li{position:relative;padding-left:29px;line-height:1.8}.usage-checklist li:before{content:'✓';position:absolute;left:0;color:var(--green);font-weight:700}.usage-mistakes{border:1px solid var(--line);border-radius:16px;padding:18px 22px}.usage-mistakes summary,.usage-sources summary{cursor:pointer;font-size:15px}.usage-mistakes .usage-figure{max-width:430px;margin:24px auto 0}.usage-screen-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:28px}.usage-screen-grid .usage-figure{max-width:180px;margin:0 auto}.usage-screen-grid h3{font-size:18px}.usage-screen-grid p{font-size:14px}.usage-method-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}.ring-sizing-table{min-width:0;width:100%}.ring-sizing-table caption{text-align:left;padding:0 0 16px;font-weight:600}.ring-sizing-table th,.ring-sizing-table td{text-align:center;padding:14px 16px}.ring-sizing-table td:last-child{color:var(--green);font-weight:650}.usage-next{display:flex;gap:18px 30px;flex-wrap:wrap;margin:30px 0}.usage-sources{color:var(--muted);font-size:13px;margin:30px 0}.usage-sources p{font-size:13px}.usage-sources .textlink{font-size:13px}.help-tutorial .tutorial-cover img{width:100%;height:100%;object-fit:contain}.help-tutorial .tutorial-cover.has-illustration{padding:12px;background:#edf2e7}
@media(max-width:900px){.usage-layout{grid-template-columns:1fr;gap:28px}.usage-nav{position:static;display:flex;gap:8px;flex-wrap:wrap;border:0}.usage-nav a{padding:10px 14px;background:#edf2e7;border:0;border-radius:24px;font-size:13px}.usage-heading{padding:30px 0}.usage-body{max-width:none}}
@media(max-width:560px){.usage-prep-grid{grid-template-columns:1fr;gap:9px}.usage-prep-grid>div{padding:16px 18px;display:flex;align-items:center;gap:18px}.usage-prep-grid strong{font-size:20px;margin:0;min-width:104px}.usage-prep-grid span{font-size:13px}.usage-method-grid{grid-template-columns:1fr;gap:8px}.usage-screen-grid{gap:12px}.usage-screen-grid h3{font-size:15px}.usage-screen-grid p{font-size:13px}.usage-body>section{padding-bottom:28px;margin-bottom:22px}.usage-figure{margin:20px 0}.usage-figure img{border-radius:12px}.ring-sizing-table th,.ring-sizing-table td{padding:13px 6px;font-size:13px}.usage-heading h1{max-width:330px}.usage-nav a span{display:none}.usage-next{gap:16px 24px}}

.usage-body #posture>.usage-figure{max-width:720px;margin-left:auto;margin-right:auto}