:root{color-scheme:light;--bg:#f6f7f8;--paper:#fff;--ink:#242a2d;--muted:#657176;--line:#e2e6e8;--tint:#edf3ef;--error:#8b3131}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.55 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}header{padding:20px 32px;background:var(--paper);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{font-size:19px;letter-spacing:-.5px;text-decoration:none;color:var(--ink);font-weight:500}.brand span{color:var(--muted);font-size:14px;font-weight:400;letter-spacing:0}.account{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.account form{margin:0}nav{display:flex;gap:22px;flex-wrap:wrap;padding:15px 32px;background:var(--paper);border-bottom:1px solid var(--line)}nav a{color:var(--muted);text-decoration:none}nav a:hover{color:var(--ink)}main{max-width:1200px;margin:0 auto;padding:36px 32px}main.auth{max-width:480px;padding-top:64px}h1{font-size:28px;letter-spacing:-.8px;font-weight:500;line-height:1.2;margin:0 0 10px}h2{font-size:17px;font-weight:500;margin:0 0 16px}p{margin:0 0 15px}.muted{color:var(--muted)}.small{font-size:12px}.eyebrow{font-size:11px;letter-spacing:1.8px;color:var(--muted);margin-bottom:14px}.panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:24px;margin:24px 0}.narrow{max-width:500px}.heading{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}.badge{display:inline-block;background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:4px 10px;font-size:12px;color:var(--muted)}label{display:block;font-size:12px;color:var(--muted);margin-bottom:18px}input,select{display:block;width:100%;min-width:0;margin-top:7px;padding:12px;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:7px;font:16px system-ui,sans-serif}button,.button{display:inline-block;background:var(--ink);color:var(--paper);border:1px solid transparent;border-radius:7px;padding:11px 17px;min-height:44px;font:14px system-ui,sans-serif;text-decoration:none;cursor:pointer;text-align:center}button:hover,.button:hover{filter:brightness(1.16)}button.secondary{background:var(--paper);color:var(--ink);border-color:var(--line)}button.quiet{background:transparent;color:var(--muted);padding:8px}.full{width:100%}.notice,.error{padding:14px 18px;border-radius:8px;margin-bottom:20px}.notice{background:var(--tint)}.error{background:#faeeee;color:var(--error)}.empty{text-align:center;padding:64px 24px}.empty-mark{color:var(--muted);font-size:42px;margin-bottom:12px}.columns{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:22px;align-items:start}.columns .panel{min-width:0}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:13px}td,th{padding:13px 10px;border-bottom:1px solid var(--line);vertical-align:middle}th{font-weight:400;color:var(--muted);font-size:12px}tr:last-child td{border-bottom:0}td .small{overflow-wrap:anywhere}strong{font-weight:500}footer{text-align:center;color:var(--muted);font-size:11px;padding:24px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #87a99c;outline-offset:3px}@media(max-width:800px){.columns{grid-template-columns:1fr}.columns .panel{margin-bottom:0}}@media(max-width:520px){header,nav{padding:16px 20px}main{padding:26px 18px}main.auth{padding-top:32px}.panel{padding:20px}.empty{padding:40px 20px}nav{gap:16px}.account{font-size:12px}}
/* Chamber management v0.2 */
.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.secondary-link{background:var(--paper);color:var(--ink);border-color:var(--line)}.chamber-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:24px 0}.chamber-grid .panel{margin:0;min-width:0}.chamber-card{display:flex;flex-direction:column;gap:6px}.chamber-card h2{margin:12px 0 0;overflow-wrap:anywhere}.chamber-card .button{margin-top:auto}.readings{display:flex;gap:20px;flex-wrap:wrap;margin:18px 0}.readings dt{font-size:11px;color:var(--muted)}.readings dd{font-size:25px;font-variant-numeric:tabular-nums;margin:3px 0}.readings dd span{font-size:12px;color:var(--muted)}.detail-readings{gap:50px}.readings dd.no-data{font-size:15px;margin-top:11px}.access-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}.access-option{display:flex;align-items:center;gap:12px;border:1px solid var(--line);padding:14px;border-radius:8px;margin:0;color:var(--ink);min-height:60px}.access-option input{width:18px;height:18px;flex:0 0 18px;margin:0;accent-color:var(--ink)}.access-option span{display:block;overflow-wrap:anywhere}.spaced{margin-top:22px}button:disabled{opacity:.5;cursor:default}@media(max-width:1000px){.chamber-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:760px){.chamber-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:520px){.access-grid{grid-template-columns:1fr}.chamber-grid{gap:10px}.chamber-grid .panel{padding:14px}.readings{gap:10px}.detail-readings{gap:30px}}@media(max-width:370px){.chamber-grid{grid-template-columns:1fr}}

/* v0.2.1: fixed Hi/Lo measurement zones, shared chamber targets */
.card-zones{margin:12px 0}.zone-block{padding:12px 0;border-top:1px solid var(--line)}.zone-block h3{font-size:12px;font-weight:500;margin:0 0 8px}.zone-block .readings{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:0}.zone-block .readings dd{font-size:23px}.zone-panels{display:grid;grid-template-columns:1fr 1fr;gap:20px}.zone-panels .panel{min-width:0}.zone-panels .heading{margin-bottom:12px}.zone-panels h2{margin:0}@media(max-width:650px){.zone-panels{grid-template-columns:1fr;gap:0}}