/* app-shell.css: the reusable mobile app shell for the peptide-app-tools tool sites (first built on
   weightlosspercentagecalculator.app, 2026-10-06; pattern and porting steps in ~/Documents/peptide-app-tools/APP-SHELL.md).
   Generic parts only: tokens, base type, app header, tab bar (bottom on phones, segmented top nav from 768 px), grouped
   collapsible rows, link rows, segmented panes (radios + CSS), result tiles, tables with a sticky first column, footer list.
   Site specific styling (tool fields, sheets, H1 fit sizes) lives in style.css, loaded after this file.
   Change a site's look with the :root tokens only. No inline styles, no scripts needed. */
:root{--bg:#f2f3f7;--card:#fff;--ink:#1d1d1f;--soft:#5f6368;--line:#e2e3e8;--line2:#c9cbd1;--acc:#1a56c4;--acc-ink:#fff;
--acc-tint:#e8effb;--tint:#f5f6f9;--warn-ink:#8a4a00;--warn-bg:#fff6e8;--ok:#1e7d4f;--r:14px;--r-s:10px;
--tab-h:56px;--gut:max(16px,env(safe-area-inset-left));--gut-r:max(16px,env(safe-area-inset-right))}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:12px}
body{margin:0;font:16px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;color:var(--ink);background:var(--bg);
overflow-wrap:break-word;-webkit-tap-highlight-color:transparent}
body.app{padding-bottom:calc(var(--tab-h) + env(safe-area-inset-bottom) + 8px)}
.wrap{max-width:560px;margin:0 auto;padding:0 var(--gut-r) 0 var(--gut)}
a{color:var(--acc)}
img,svg{max-width:100%}
p,ul,ol{margin:0 0 10px}
li{margin:2px 0}
button{font:inherit;cursor:pointer}
.skip{position:absolute;left:8px;top:-60px;background:var(--acc);color:var(--acc-ink);padding:10px 14px;border-radius:8px;z-index:50}
.skip:focus{top:8px}
.offscreen-copy{position:fixed;top:0;left:0;width:1px;height:1px;opacity:0}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--acc);outline-offset:1px;border-color:transparent}

/* app header: logo + short name; on desktop the tab items sit here as a segmented control */
.app-head-in{max-width:560px;margin:0 auto;padding:4px var(--gut-r) 0 var(--gut);display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:52px}
.brand{display:flex;align-items:center;gap:8px;min-height:44px;font-weight:700;font-size:17px;color:inherit;text-decoration:none;letter-spacing:-.01em}
.brand img{width:28px;height:28px;border-radius:7px}

/* tab bar: phones (under 768 px) get a fixed bottom bar with icons and short labels */
.tabs{position:fixed;left:0;right:0;bottom:0;z-index:40;display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);
padding:0 env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
background:rgba(250,250,252,.96);border-top:1px solid var(--line);-webkit-backdrop-filter:saturate(1.6) blur(14px);backdrop-filter:saturate(1.6) blur(14px)}
.tab{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:var(--tab-h);padding:4px 2px;
font-size:11px;font-weight:600;line-height:1.1;color:#6b6f76;text-decoration:none;text-align:center}
.tab svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tab[aria-current]{color:var(--acc)}
.tab[aria-current] svg{stroke-width:2.2}
.tab:focus-visible{outline-offset:-3px;border-radius:10px}
@media (min-width:768px){
body.app{padding-bottom:0}
.tabs{position:static;display:flex;gap:2px;padding:3px;background:#e6e7ec;border:0;border-radius:12px;-webkit-backdrop-filter:none;backdrop-filter:none}
.tab{flex-direction:row;min-height:44px;padding:0 12px;border-radius:9px;font-size:14px;color:var(--soft)}
.tab svg{display:none}
.tab:hover{color:var(--ink)}
.tab[aria-current]{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(16,24,40,.12)}
}

/* page top: breadcrumb, one-line H1, one short answer sentence */
.crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:2px 0 0;padding:0;font-size:13px;color:var(--soft)}
.crumbs li{margin:0}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--line2)}
.crumbs a{color:var(--soft);display:inline-block;min-height:24px;line-height:24px}
h1{font-size:clamp(22px,6vw,28px);line-height:1.2;margin:4px 0 4px;letter-spacing:-.015em}
.lead p,p.lead{margin:0 0 10px;color:var(--soft);font-size:15px}
.meta-line{font-size:12px;color:var(--soft);margin:8px 4px 0}
.draft-banner{background:var(--warn-bg);color:var(--warn-ink);padding:8px 12px;border-radius:8px;font-size:14px}

/* card: the tool panel */
.card{position:relative;background:var(--card);border-radius:var(--r);padding:14px;
box-shadow:0 1px 2px rgba(16,24,40,.06),0 6px 18px -10px rgba(16,24,40,.18)}

/* grouped list: label, then one rounded white list of rows */
.group{margin-top:16px}
.group-label{font-size:13px;font-weight:600;line-height:1.3;text-transform:uppercase;letter-spacing:.04em;color:var(--soft);margin:0 4px 6px}
.list{list-style:none;margin:0;padding:0;background:var(--card);border-radius:var(--r);overflow:hidden;box-shadow:0 1px 2px rgba(16,24,40,.06)}
.list>*+*{border-top:1px solid var(--line)}
.list>li{margin:0}

/* collapsible row: details/summary with a chevron; any H2 inside the summary keeps its heading role */
.row>summary{list-style:none;display:flex;align-items:center;gap:10px;min-height:44px;padding:8px 14px;cursor:pointer}
.row>summary::-webkit-details-marker{display:none}
.row>summary>h2,.row>summary>h3,.row-t{flex:1;min-width:0;margin:0;font-size:15px;line-height:1.3;font-weight:600;letter-spacing:0}
.row>summary>svg,.lrow>svg:last-child{flex:none;width:18px;height:18px;fill:none;stroke:#a0a4ab;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;transition:transform .2s ease}
.row[open]>summary>svg{transform:rotate(90deg)}
.row>summary:hover{background:var(--tint)}
.row>summary:focus-visible{outline-offset:-3px;border-radius:var(--r-s)}
.row-body{padding:0 14px 12px;font-size:15px}
.row-body>:last-child{margin-bottom:0}
.row-body h3{font-size:15px;margin:12px 0 4px}
.row-body h4{font-size:15px;margin:10px 0 4px}
.row-body ul,.row-body ol{padding-left:20px}

/* link row: icon, title over a one-line description, chevron */
.lrow{display:flex;align-items:center;gap:12px;min-height:46px;padding:6px 14px;color:var(--ink);text-decoration:none}
.lrow:hover{background:var(--tint)}
.lrow:focus-visible{outline-offset:-3px;border-radius:var(--r-s)}
.lrow>svg:first-child{flex:none;width:22px;height:22px;fill:none;stroke:var(--acc);stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.lrow-t{flex:1;min-width:0}
.lrow-t b{display:block;font-size:15px;font-weight:600;line-height:1.3}
.lrow-t span{display:block;font-size:13px;color:var(--soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lrow[aria-current] b{color:var(--acc)}

/* segmented control: radios + labels + panes, CSS only (supports 2 to 4 panes) */
.segbox{position:relative;margin:0 0 10px}
.seg-r{position:absolute;opacity:0;width:1px;height:1px;margin:0;pointer-events:none}
.seg{display:flex;padding:2px;background:#e6e7ec;border-radius:10px;margin:0 0 8px}
.seg label{flex:1;display:flex;align-items:center;justify-content:center;min-height:44px;border-radius:8px;font-size:14px;font-weight:600;color:var(--soft);cursor:pointer}
.seg-r:nth-of-type(1):checked~.seg label[data-i="1"],.seg-r:nth-of-type(2):checked~.seg label[data-i="2"],
.seg-r:nth-of-type(3):checked~.seg label[data-i="3"],.seg-r:nth-of-type(4):checked~.seg label[data-i="4"]{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(16,24,40,.14)}
.seg-r:nth-of-type(1):focus-visible~.seg label[data-i="1"],.seg-r:nth-of-type(2):focus-visible~.seg label[data-i="2"],
.seg-r:nth-of-type(3):focus-visible~.seg label[data-i="3"],.seg-r:nth-of-type(4):focus-visible~.seg label[data-i="4"]{outline:2px solid var(--acc);outline-offset:1px}
.seg-r:nth-of-type(1):not(:checked)~.seg-pane[data-i="1"],.seg-r:nth-of-type(2):not(:checked)~.seg-pane[data-i="2"],
.seg-r:nth-of-type(3):not(:checked)~.seg-pane[data-i="3"],.seg-r:nth-of-type(4):not(:checked)~.seg-pane[data-i="4"]{display:none}

/* results: big number, one-line math chip, 2 or 3 tiles */
.result{margin-top:10px;padding-top:10px;border-top:1px solid var(--line)}
.result p{margin:0 0 6px}
.big{display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 8px;font-size:15px;line-height:1.2;font-weight:600;color:var(--soft)}
.big .bn{font-size:40px;line-height:1.05;font-weight:800;color:var(--ink);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.big .bn:empty,.big .bl:empty{display:none}
.chip{display:inline-block;max-width:100%;font-size:13px;line-height:1.35;color:var(--soft);background:var(--tint);border-radius:999px;padding:4px 10px;font-variant-numeric:tabular-nums}
.chip:empty{display:none}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin:8px 0}
.stats.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.stat{background:var(--tint);border-radius:var(--r-s);padding:7px 9px;min-width:0}
.stat-k{display:block;font-size:12px;line-height:1.25;color:var(--soft)}
.stat-v{display:block;font-size:17px;line-height:1.3;font-weight:700;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.small{font-size:13px;line-height:1.4;color:var(--soft)}
.small:empty{display:none}

/* tables: compact numbers, sticky first column, scroll inside the box (never the page) */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 10px;border:1px solid var(--line);border-radius:var(--r-s)}
table{width:100%;border-collapse:separate;border-spacing:0;font-size:14px}
th,td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child>td{border-bottom:0}
th{font-size:12px;line-height:1.25;color:var(--soft);font-weight:600;background:var(--tint)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.table-scroll th:first-child,.table-scroll td:first-child{position:sticky;left:0;z-index:1;background:var(--card);white-space:nowrap;box-shadow:1px 0 0 var(--line)}
.table-scroll th:first-child{background:var(--tint)}
code{font:14px ui-monospace,Menlo,monospace;background:var(--tint);padding:1px 4px;border-radius:4px}

/* footer: the "More" list the More tab points at */
.app-foot{margin-top:22px;padding:4px 0 18px;font-size:13px;color:var(--soft)}
.app-foot .list{margin-bottom:12px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
.app-foot .list>*+*{border-top:0}
.app-foot .list>li{box-shadow:inset 0 -1px 0 var(--line)}
.app-foot .list>li:nth-child(odd){box-shadow:inset -1px -1px 0 var(--line)}
.app-foot .lrow{gap:10px;padding:6px 12px}
.app-foot .lrow>svg:last-child{display:none}
.app-foot p{margin:4px 4px}
.app-foot .foot-strong{font-weight:600;color:var(--ink)}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.tabs,.app-head,.app-foot,.skip{display:none!important}body,body.app{background:#fff;padding:0}.card,.list{box-shadow:none}}

/* header fit fix (2026-10-06): on wider screens the brand name and the top tab pill must never overlap */
@media (min-width:768px){.app-head-in{max-width:600px}.brand{min-width:0;flex:0 1 auto;overflow:hidden}.brand span{overflow:hidden;text-overflow:ellipsis}.app-head .tabs{flex:none;margin-left:auto}}
/* compact top nav (Ken 2026-10-06): smaller pill, header close to the content width */
@media (min-width:768px){.app-head .tabs{padding:2px;gap:0}.app-head .tab{min-height:32px;padding:0 11px;font-size:13px}}