/* Heptavo — one stylesheet for heptavo.com. The palette is the app's own (Theme.swift, enum Ink):
   blue-first, `sky` is the accent, `leaf` means correct/done, and the two meet in the brand gradient.
   Light by default, dark follows the system, and a visitor's own choice (data-theme) wins both ways. */
@font-face{font-family:'Geist';font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/fonts/geist.woff2) format('woff2')}
:root{
  --bg:#F4F7FA;--surface:#FFFFFF;--raised:#EAF0F5;--border:#DCE4EC;--border-2:#BCC9D8;
  --text:#0C1A2B;--muted:#3A4A5E;--dim:#617087;--faint:#A9B5C4;
  --sky:#1A73D9;--sky-soft:#E4F0FD;--leaf:#0E8F67;--leaf-text:#0B7A57;--leaf-soft:#DDF5EB;
  --amber:#A86E00;--amber-soft:#FBF0D9;--rose:#C8364F;--rose-soft:#FBE7EB;
  --violet:#6B4FD8;--teal:#0B8296;--plum:#B03A86;--ochre:#9A6B00;--coral:#C8364F;
  --b1:#2394EC;--b2:#3ED6A0;--m1:#2394EC;--m2:#3ED6A0;--on-brand:#062033;
  --brand:linear-gradient(135deg,var(--b1),var(--b2));
  --glass:rgba(244,247,250,.78);
  --shadow:0 6px 20px rgba(12,26,43,.06),0 1px 2px rgba(12,26,43,.05);
  --shadow-lg:0 30px 80px -20px rgba(12,26,43,.22),0 2px 6px rgba(12,26,43,.06);
  --glow-a:rgba(35,148,236,.14);--glow-b:rgba(62,214,160,.12);
  /* legacy names the guide components use */
  --card:var(--surface);--card-solid:var(--surface);--bg-2:var(--raised);--ink:var(--text);--ink-2:var(--muted);--mute:var(--dim);
  --line:var(--border);--line-2:var(--border-2);--accent:var(--sky);--accent-soft:var(--sky-soft);--mark:var(--b2);--warn:var(--amber);--warn-soft:var(--amber-soft);
  --sys:-apple-system,BlinkMacSystemFont,'SF Pro Text','Geist',system-ui,'Segoe UI',Roboto,sans-serif;
  --display:-apple-system,BlinkMacSystemFont,'SF Pro Display','Geist',system-ui,'Segoe UI',Roboto,sans-serif;
  --body:var(--sys);
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --max:1120px;--read:42rem;--r:20px;--r-s:12px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#08111D;--surface:#0F1B2B;--raised:#17263B;--border:#1F3149;--border-2:#2F4767;
  --text:#EAF1FA;--muted:#B0C0D6;--dim:#8195B2;--faint:#3A4E6C;
  --sky:#4AA8FA;--sky-soft:#10284A;--leaf:#48E2AA;--leaf-text:#48E2AA;--leaf-soft:#0E3128;
  --amber:#F5B544;--amber-soft:#3A2C0F;--rose:#F2637D;--rose-soft:#3A1623;
  --violet:#A995FA;--teal:#3FCBDB;--plum:#E784CC;--ochre:#F2B84B;--coral:#F2738A;
  --b1:#2E9BF0;--m1:#3BA6FA;--m2:#48E2AA;--glass:rgba(8,17,29,.72);
  --shadow:none;--shadow-lg:0 40px 100px -30px rgba(0,0,0,.7);
  --glow-a:rgba(46,155,240,.20);--glow-b:rgba(62,214,160,.12);
  color-scheme:dark;
}}
:root[data-theme=dark]{
  --bg:#08111D;--surface:#0F1B2B;--raised:#17263B;--border:#1F3149;--border-2:#2F4767;
  --text:#EAF1FA;--muted:#B0C0D6;--dim:#8195B2;--faint:#3A4E6C;
  --sky:#4AA8FA;--sky-soft:#10284A;--leaf:#48E2AA;--leaf-text:#48E2AA;--leaf-soft:#0E3128;
  --amber:#F5B544;--amber-soft:#3A2C0F;--rose:#F2637D;--rose-soft:#3A1623;
  --violet:#A995FA;--teal:#3FCBDB;--plum:#E784CC;--ochre:#F2B84B;--coral:#F2738A;
  --b1:#2E9BF0;--m1:#3BA6FA;--m2:#48E2AA;--glass:rgba(8,17,29,.72);
  --shadow:none;--shadow-lg:0 40px 100px -30px rgba(0,0,0,.7);
  --glow-a:rgba(46,155,240,.20);--glow-b:rgba(62,214,160,.12);
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-padding-top:76px}
body{margin:0;background:var(--bg);color:var(--text);font:400 1.0625rem/1.65 var(--body);
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));overflow-x:clip;
  background-image:radial-gradient(70vmax 46vmax at 92% -14%,var(--glow-a),transparent 62%),radial-gradient(50vmax 40vmax at -10% 4%,var(--glow-b),transparent 60%);background-repeat:no-repeat}
@media (min-width:720px){body{padding-left:max(32px,env(safe-area-inset-left,0px));padding-right:max(32px,env(safe-area-inset-right,0px))}}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--bg)}
a{color:var(--sky);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
::selection{background:var(--sky-soft);color:var(--text)}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px;border-radius:8px}
.skip{position:absolute;left:-999px;top:8px;background:var(--text);color:var(--bg);padding:8px 12px;border-radius:8px;z-index:50}
.skip:focus{left:16px}
.wrap{max-width:var(--max);margin-inline:auto}
h1,h2,h3{font-family:var(--display);font-weight:700;letter-spacing:-.025em;text-wrap:balance;margin:0;color:var(--text)}
.label{font:600 .74rem/1.3 var(--sys);letter-spacing:.08em;text-transform:uppercase;color:var(--dim);margin:0}
.label b{color:var(--sky);font-weight:650}
.grad{background:var(--brand);-webkit-background-clip:text;background-clip:text;color:transparent}

/* header: the app's frosted bar */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;margin-left:calc(-1*max(16px,env(safe-area-inset-left,0px)));margin-right:calc(-1*max(16px,env(safe-area-inset-right,0px)));
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));
  background:var(--glass);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid var(--border)}
@media (min-width:720px){.top{margin-left:calc(-1*max(32px,env(safe-area-inset-left,0px)));margin-right:calc(-1*max(32px,env(safe-area-inset-right,0px)));padding-left:max(32px,env(safe-area-inset-left,0px));padding-right:max(32px,env(safe-area-inset-right,0px))}}
.top .wrap{display:flex;align-items:center;gap:12px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font:700 1.08rem/1 var(--display);letter-spacing:-.02em;color:var(--text);text-decoration:none}
.brand svg{flex:none;width:28px;height:28px}
.brand:hover{text-decoration:none}
.nav{display:flex;gap:2px;margin-left:auto}
.nav a{color:var(--muted);text-decoration:none;font-size:.92rem;font-weight:500;padding:8px 12px;border-radius:999px}
.nav a:hover,.nav a[aria-current=page]{background:var(--raised);color:var(--text)}
.circle{flex:none;width:40px;height:40px;display:grid;place-items:center;border-radius:50%;background:var(--surface);border:1px solid var(--border);color:var(--muted);cursor:pointer;padding:0}
.circle:hover{color:var(--text);border-color:var(--border-2)}
.circle svg{width:18px;height:18px}
.theme-btn .moon{display:none}
:root[data-theme=dark] .theme-btn .sun{display:none}:root[data-theme=dark] .theme-btn .moon{display:block}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .theme-btn .sun{display:none}:root:not([data-theme=light]) .theme-btn .moon{display:block}}
/* buttons: the app's primary (brand gradient, ink label) and secondary */
.pill{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--brand);color:var(--on-brand);text-decoration:none;font:600 .95rem/1 var(--sys);padding:13px 18px;border-radius:16px;white-space:nowrap;border:0;cursor:pointer}
.pill svg{width:17px;height:17px;fill:currentColor}
.pill:hover{text-decoration:none;filter:brightness(1.04) saturate(1.05)}
.pill:active{opacity:.85}
.pill.ghost{background:var(--surface);color:var(--muted);border:1px solid var(--border)}
.pill.ghost:hover{color:var(--text);border-color:var(--border-2);filter:none}
.top .pill{padding:10px 14px;font-size:.86rem;border-radius:12px}
@media (max-width:760px){.hide-s{display:none}}
@media (max-width:520px){.top .pill span{display:none}.top .pill{padding:10px 11px}.nav a{padding:8px 9px}}
/* breadcrumbs */
.crumbs{display:flex;flex-wrap:wrap;gap:6px;font-size:.86rem;color:var(--mute);margin:28px 0 22px}
.crumbs a{color:var(--mute);text-decoration:none}
.crumbs a:hover{color:var(--ink);text-decoration:underline}
.post .crumbs .here,.post .crumbs .here+span,.post .crumbs span:has(+.here){display:none}

/* hub + category heads */
.hero{padding:clamp(36px,7vw,84px) 0 clamp(24px,4vw,40px);max-width:52rem}
.hero h1{font-size:clamp(2.3rem,6vw,4rem);line-height:1.02;margin:14px 0 18px}
.hero p.lead{font-size:clamp(1.06rem,2vw,1.2rem);color:var(--ink-2);margin:0 0 22px;max-width:44rem}
.hero .row{display:flex;flex-wrap:wrap;gap:10px}
.sec{margin:clamp(40px,6vw,72px) 0}
.sec>h2{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:6px}
.sec>p.sub{color:var(--mute);margin:0 0 20px;max-width:44rem}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.sec-head a{font-size:.92rem;font-weight:600;text-decoration:none}

/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:14px}
.card{display:flex;flex-direction:column;gap:7px;padding:20px 20px 18px;border-radius:var(--r);background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);text-decoration:none;color:var(--ink);transition:transform .2s ease,border-color .2s ease}
.card:hover{transform:translateY(-2px);border-color:var(--line-2);text-decoration:none}
.card .k{font:650 .7rem/1.2 var(--body);letter-spacing:.08em;text-transform:uppercase;color:var(--sky)}
.card .t{font:650 1.08rem/1.3 var(--display);letter-spacing:-.015em}
.card .d{font-size:.92rem;line-height:1.5;color:var(--mute)}
.card .m{margin-top:auto;padding-top:6px;font-size:.8rem;color:var(--mute)}
.cats{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,168px),1fr));gap:12px}
@media (max-width:520px){.cats{grid-template-columns:1fr 1fr}.cat{padding:16px}.cat .t{font-size:.98rem}}
.cat{position:relative;display:flex;flex-direction:column;gap:6px;padding:20px;border-radius:var(--r);background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);text-decoration:none;color:var(--ink);overflow:hidden}
.cat:hover{border-color:var(--line-2);text-decoration:none}
.cat svg{width:30px;height:30px;color:var(--accent)}
.cat .t{font:650 1.05rem/1.25 var(--display)}
.cat .n{font-size:.82rem;color:var(--mute)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.chips a{display:inline-block;padding:7px 13px;border-radius:999px;background:var(--card);border:1px solid var(--line);font-size:.9rem;color:var(--ink);text-decoration:none}
.chips a:hover{border-color:var(--line-2)}
.list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.list li{border-bottom:1px solid var(--line)}
.list a{display:flex;justify-content:space-between;gap:16px;padding:13px 2px;color:var(--ink);text-decoration:none}
.list a:hover .lt{text-decoration:underline}
.list .lm{flex:none;color:var(--mute);font-size:.84rem}
.subj{scroll-margin-top:80px}
.subj h3{font-size:1.1rem;margin:26px 0 8px}

/* article */
.post{max-width:var(--read);margin-inline:auto;padding-bottom:24px}
.post h1{font-size:clamp(2rem,5vw,2.9rem);line-height:1.08;margin:12px 0 16px}
.dek{font-size:1.18rem;line-height:1.55;color:var(--ink-2);margin:0 0 18px}
.byline{font-size:.88rem;color:var(--mute);margin:0 0 30px;padding-bottom:22px;border-bottom:1px solid var(--line)}
.byline strong{color:var(--ink);font-weight:600}
.toc{margin:0 0 34px;padding:16px 20px;border-radius:var(--r);background:var(--bg-2)}
.toc summary{cursor:pointer;font-weight:650;font-size:.95rem;list-style:none}
.toc summary::-webkit-details-marker{display:none}
.toc summary::after{content:' +';color:var(--mute)}
.toc[open] summary::after{content:' −'}
.toc ol{margin:10px 0 2px;padding-left:1.2rem;font-size:.93rem;line-height:1.55}
.toc li{margin:4px 0}
.toc a{color:var(--ink-2);text-decoration:none}
.toc a:hover{color:var(--accent);text-decoration:underline}
.prose>*{margin-block:0 1.05em}
.prose h2{font-size:clamp(1.45rem,3vw,1.8rem);line-height:1.2;margin:2.1em 0 .6em;scroll-margin-top:80px}
.prose h3{font-size:1.18rem;line-height:1.3;margin:1.7em 0 .5em;scroll-margin-top:80px}
.prose p,.prose li{color:var(--ink-2)}
.prose strong{color:var(--ink);font-weight:620}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--mute)}
.prose blockquote{margin:1.4em 0;padding:14px 18px;border-left:3px solid var(--sky);background:var(--bg-2);border-radius:0 var(--r-s) var(--r-s) 0}
.prose blockquote p:last-child{margin-bottom:0}
.prose code{font:.9em var(--mono);background:var(--bg-2);padding:.1em .35em;border-radius:6px}
.prose hr{border:0;border-top:1px solid var(--line);margin:2.2em 0}
.prose figure{margin:1.8em 0}
.prose figure svg,.prose figure img{display:block;width:100%;height:auto;max-width:100%;border-radius:var(--r-s);background:var(--card-solid);border:1px solid var(--line)}
.prose figcaption{font-size:.86rem;color:var(--mute);margin-top:8px;line-height:1.5}
.tbl{overflow-x:auto;margin:1.4em 0;border:1px solid var(--line);border-radius:var(--r-s);background:var(--card-solid)}
.tbl table{border-collapse:collapse;width:100%;font-size:.92rem;line-height:1.45}
.tbl th,.tbl td{text-align:left;vertical-align:top;padding:10px 12px;border-bottom:1px solid var(--line)}
.tbl th{font-weight:650;color:var(--ink);background:var(--bg-2)}
.tbl tbody th{background:transparent}
.tbl tr:last-child td{border-bottom:0}
.callout{margin:1.6em 0;padding:16px 18px;border-radius:var(--r-s);background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 22%,transparent)}
.callout.warn{background:var(--warn-soft);border-color:color-mix(in srgb,var(--warn) 30%,transparent)}
.callout>:last-child{margin-bottom:0}
.callout .ct{display:block;font-weight:650;color:var(--ink);margin-bottom:4px}
.fix{display:grid;gap:8px;margin:1em 0 1.4em}
.fix p{margin:0;padding:10px 14px;border-radius:var(--r-s);font-size:.95rem}
.fix .no{background:var(--warn-soft)}
.fix .yes{background:var(--accent-soft)}
.fix b{display:block;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);margin-bottom:2px}

/* FAQ, practice, CTA, related */
.block{margin:42px 0 0}
.block>h2{font-size:1.5rem;margin-bottom:14px}
.faq details{border-top:1px solid var(--line);padding:4px 0}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary,.qa summary{cursor:pointer;list-style:none;padding:12px 28px 12px 0;position:relative;font-weight:620;color:var(--ink)}
.faq summary::-webkit-details-marker,.qa summary::-webkit-details-marker{display:none}
.faq summary::after,.qa summary::after{content:'+';position:absolute;right:4px;top:10px;color:var(--mute);font-size:1.2rem}
.faq details[open] summary::after,.qa details[open] summary::after{content:'−'}
.faq .a{color:var(--ink-2);padding:0 0 12px}
.faq .a>:last-child{margin-bottom:0}
.qa{padding:22px;border-radius:var(--r);background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow)}
.qa .stem>:last-child{margin-bottom:.6em}
.qa ol.opts{list-style:upper-alpha;padding-left:1.6em;margin:.4em 0 .8em}
.qa ol.opts li{margin:.3em 0;color:var(--ink-2)}
.qa details{border-top:1px solid var(--line);margin-top:6px}
.qa summary{color:var(--sky)}
.qa .ms{color:var(--ink-2);font-size:.96rem}
.qa .ms>:last-child{margin-bottom:0}
.cta{margin:46px 0 0;padding:clamp(22px,4vw,34px);border-radius:24px;background:linear-gradient(135deg,var(--card-solid),var(--bg-2));border:1px solid var(--line);box-shadow:var(--shadow);position:relative;overflow:hidden}
.cta::before{content:'';position:absolute;right:-60px;top:-60px;width:220px;height:220px;background:var(--brand);opacity:.16;clip-path:polygon(50% 0,89% 19%,98% 61%,72% 95%,28% 95%,2% 61%,11% 19%);pointer-events:none}
.cta h2{font-size:clamp(1.35rem,3vw,1.7rem);margin:8px 0 10px;position:relative}
.cta p{color:var(--ink-2);margin:0 0 18px;max-width:34rem;position:relative}
.cta .row{display:flex;flex-wrap:wrap;gap:10px;position:relative}
.author{display:flex;gap:14px;align-items:flex-start;margin:40px 0 0;padding:18px 0 0;border-top:1px solid var(--line);font-size:.92rem;color:var(--mute)}
.author .av{flex:none;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--bg-2);color:var(--ink);font-weight:650}
.author p{margin:0 0 4px}
.author .name{color:var(--ink);font-weight:650}
.related{max-width:var(--max);margin:56px auto 0}
.related h2{font-size:1.4rem;margin-bottom:14px}


/* footer */
.foot{margin-top:80px;padding:34px 0 46px;border-top:1px solid var(--border);font-size:.86rem;color:var(--dim)}
.foot nav{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:14px}
.foot a{color:var(--muted);text-decoration:none}
.foot a:hover{text-decoration:underline}
.foot p{margin:6px 0;max-width:52rem}
.foot .row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin-top:18px}
/* appearance: Auto / Light / Dark, the iOS segmented control */
.seg{display:inline-flex;padding:3px;border-radius:12px;background:var(--raised);gap:2px}
.seg button{font:500 .82rem/1 var(--sys);color:var(--muted);background:transparent;border:0;border-radius:9px;padding:7px 12px;cursor:pointer}
.seg button[aria-pressed=true]{background:var(--surface);color:var(--text);box-shadow:0 1px 3px rgba(12,26,43,.12)}
/* legal + support documents */
.doc{max-width:var(--read);margin-inline:auto;padding:clamp(30px,6vw,64px) 0 0}
.doc h1{font-size:clamp(2.1rem,5vw,2.9rem);line-height:1.06;margin:10px 0 10px}
.doc .meta{color:var(--dim);margin:0 0 28px}
.doc h2{font-size:1.3rem;margin:2em 0 .5em}
.doc h3{font-size:1.06rem;margin:1.5em 0 .4em}
.doc p,.doc li{color:var(--muted)}
.doc strong{color:var(--text)}
.doc ul,.doc ol{padding-left:1.3em}
.doc .card,.doc address{display:block;font-style:normal}
.doc .card{padding:18px 20px;border-radius:var(--r);background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);margin:0 0 1em;color:var(--muted)}
.doc details{border-top:1px solid var(--border);padding:4px 0}
.doc details:last-of-type{border-bottom:1px solid var(--border)}
.doc summary{cursor:pointer;list-style:none;padding:12px 28px 12px 0;position:relative;font-weight:600;color:var(--text)}
.doc summary::-webkit-details-marker{display:none}
.doc summary::after{content:'+';position:absolute;right:4px;top:10px;color:var(--dim);font-size:1.2rem}
.doc details[open] summary::after{content:'−'}
.doc .mail{font-weight:600;color:var(--text)}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{.top,.foot,.cta,.related,.toc{display:none}body{background:#fff;color:#000}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}