/* GradeFlow content pages — one stylesheet for every page built by build-site.mjs.
   Built to /assets/content-<hash>.css. Tokens first; components below read only tokens. */
@font-face{font-family:"Inter";src:url("/fonts/inter-var.woff2") format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"Newsreader";src:url("/fonts/newsreader-var.woff2") format("woff2");font-weight:400 700;font-style:normal;font-display:swap}
@font-face{font-family:"Newsreader";src:url("/fonts/newsreader-italic-var.woff2") format("woff2");font-weight:400 600;font-style:italic;font-display:swap}

:root{
  color-scheme:light;
  --bg:#FBFAF7;--sheet:#FFFFFF;--soft:#F4F2EC;--line:#E6E2D8;--line-strong:#D3CEC2;
  --fg:#171E2A;--fg2:#3B4452;--muted:#646B76;
  --primary:#2A54AC;--primary-ink:#1E3D82;--primary-wash:#ECF1FB;--on-primary:#FFFFFF;
  --pen:#B42318;--pen-wash:#FCEFEC;--mark:#FBE7A1;
  --a1:#2A54AC;--a2:#0E8F78;--a3:#B4761A;--a4:#7A3E8C;
  --shadow:0 1px 2px rgba(23,30,42,.05),0 6px 24px -12px rgba(23,30,42,.18);
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;
  --bg:#0F141B;--sheet:#161B24;--soft:#1B2230;--line:#2A3240;--line-strong:#3A4456;
  --fg:#EEF0F3;--fg2:#C7CDD6;--muted:#9AA3AF;
  --primary:#8AA8F5;--primary-ink:#B5C8FA;--primary-wash:#1A2540;--on-primary:#0F141B;
  --pen:#F7806F;--pen-wash:#2B1B1D;--mark:rgba(250,204,21,.26);
  --a1:#5C7AE6;--a2:#26A68E;--a3:#C2821C;--a4:#A86FBE;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 28px -14px rgba(0,0,0,.6);
}}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0F141B;--sheet:#161B24;--soft:#1B2230;--line:#2A3240;--line-strong:#3A4456;
  --fg:#EEF0F3;--fg2:#C7CDD6;--muted:#9AA3AF;
  --primary:#8AA8F5;--primary-ink:#B5C8FA;--primary-wash:#1A2540;--on-primary:#0F141B;
  --pen:#F7806F;--pen-wash:#2B1B1D;--mark:rgba(250,204,21,.26);
  --a1:#5C7AE6;--a2:#26A68E;--a3:#C2821C;--a4:#A86FBE;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 28px -14px rgba(0,0,0,.6);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.68 var(--sans);font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--primary-ink);text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--primary);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:12px;z-index:50;background:var(--sheet);padding:8px 12px}

/* ---------- chrome ---------- */
.progress{position:fixed;inset:0 0 auto;height:3px;z-index:30;pointer-events:none}
.progress span{display:block;height:100%;width:0;background:var(--primary);transition:width .1s linear}
header.site{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.bar{max-width:72rem;margin:0 auto;height:60px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-inline:max(16px,env(safe-area-inset-left,0px)) max(16px,env(safe-area-inset-right,0px))}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:17px;color:var(--fg);text-decoration:none;letter-spacing:-.01em}
.brand img{width:26px;height:26px}
nav.site{display:flex;align-items:center;gap:18px;font-size:15px}
nav.site a{color:var(--fg);text-decoration:none}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--primary);color:var(--on-primary)!important;text-decoration:none!important;font:600 15px/1 var(--sans);padding:12px 18px;border-radius:999px;border:0;cursor:pointer;transition:background .15s,transform .15s}
.btn:hover{background:var(--primary-ink);transform:translateY(-1px)}
.btn.small{padding:9px 15px;font-size:14px}
.btn svg{width:16px;height:16px}

/* ---------- layout ---------- */
.page{max-width:72rem;margin:0 auto;padding-inline:max(16px,env(safe-area-inset-left,0px)) max(16px,env(safe-area-inset-right,0px));display:grid;grid-template-columns:minmax(0,1fr);gap:0 64px}
.col{min-width:0;max-width:44rem}
@media (min-width:1100px){.page{grid-template-columns:minmax(0,44rem) 15rem;justify-content:center}}

/* ---------- hero ---------- */
.crumbs{font-size:13.5px;color:var(--muted);margin:28px 0 20px;display:flex;flex-wrap:wrap;gap:6px}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--fg)}
.crumbs .sep{opacity:.5}
.kicker{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 14px}
.kicker span{font:600 12px/1 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--primary);background:var(--primary-wash);padding:6px 10px;border-radius:999px}
h1{font:600 clamp(2rem,4.4vw,2.85rem)/1.1 var(--serif);letter-spacing:-.015em;margin:0 0 18px;text-wrap:balance}
.lead{font:400 1.24rem/1.55 var(--serif);color:var(--fg2);margin:0 0 22px;text-wrap:pretty}
.byline{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:14px;color:var(--muted);padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:0 0 8px}
.byline b{color:var(--fg);font-weight:600}
.byline .dot{width:3px;height:3px;border-radius:50%;background:var(--line-strong)}
.byline .ai{display:flex;align-items:center;gap:6px;flex-basis:100%;font-size:13px}
.byline .ai svg{width:14px;height:14px}

/* ---------- toc ---------- */
.toc-side{display:none;position:sticky;top:92px;align-self:start;margin-top:150px;font-size:14px}
.toc-side p{font:600 11.5px/1 var(--sans);letter-spacing:.09em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.toc-side ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc-side li a{display:block;padding:6px 0 6px 14px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);text-decoration:none;line-height:1.35}
.toc-side li a:hover{color:var(--fg)}
.toc-side li a[aria-current="true"]{color:var(--fg);border-left-color:var(--primary);font-weight:600}
.toc-side .btn{margin-top:22px}
.toc-inline{margin:18px 0 0;border:1px solid var(--line);border-radius:12px;background:var(--sheet)}
.toc-inline summary{cursor:pointer;list-style:none;padding:12px 16px;font-weight:600;font-size:15px;display:flex;justify-content:space-between;align-items:center}
.toc-inline summary::-webkit-details-marker{display:none}
.toc-inline summary::after{content:"";width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg) translateY(-2px);transition:transform .2s}
.toc-inline[open] summary::after{transform:rotate(-135deg)}
.toc-inline ol{margin:0;padding:0 16px 14px 34px;font-size:15px}
.toc-inline li{margin:5px 0}
@media (min-width:1100px){.toc-inline{display:none}.toc-side{display:block}}

/* ---------- body text ---------- */
article section{margin-top:64px}
.sec-k{display:block;font:600 12px/1 var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;font-variant-numeric:tabular-nums}
h2{font:600 clamp(1.55rem,2.6vw,1.9rem)/1.18 var(--serif);letter-spacing:-.01em;margin:0 0 18px;text-wrap:balance}
h3{font:600 1.3rem/1.3 var(--serif);margin:40px 0 10px;letter-spacing:-.005em}
p{margin:0 0 16px;text-wrap:pretty}
article ul,article ol{padding-left:1.25em;margin:0 0 18px}
article li{margin:6px 0}
article li::marker{color:var(--muted)}
strong{font-weight:650}
mark{background:linear-gradient(transparent 52%,var(--mark) 52%);color:inherit;padding:0 .08em}
code{font-size:.92em;background:var(--soft);padding:1px 5px;border-radius:4px}
.actions{margin:22px 0 0;display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* ---------- facts ---------- */
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:26px 0 8px}
.facts div{background:var(--sheet);padding:16px 18px;display:flex;flex-direction:column-reverse;justify-content:flex-end;gap:4px}
.facts dd{margin:0;font:600 1.75rem/1.1 var(--serif);letter-spacing:-.01em;font-variant-numeric:lining-nums}
@media (max-width:560px){.facts dd{font-size:1.45rem}}
.facts dt{font-size:13px;color:var(--muted);line-height:1.35}

/* ---------- glance / note / details ---------- */
.glance{background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:22px 24px 8px;margin:28px 0;box-shadow:var(--shadow)}
.glance-k,.note-k{font:600 12px/1 var(--sans);letter-spacing:.09em;text-transform:uppercase;margin:0 0 14px}
.glance-k{color:var(--primary)}
.glance ul{list-style:none;padding:0}
.glance li{position:relative;padding-left:30px;margin:0 0 12px}
.glance li::before{content:"";position:absolute;left:0;top:.28em;width:18px;height:18px;border-radius:50%;background:var(--primary-wash) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%232A54AC' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5.5 10.5l3 3 6-7'/%3E%3C/svg%3E") center/13px no-repeat}
.note{border-left:3px solid var(--primary);background:var(--primary-wash);border-radius:0 12px 12px 0;padding:16px 20px 2px;margin:24px 0}
.note-k{color:var(--primary-ink)}
.note p{font-size:16px}
details.more{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:22px 0}
details.more summary{cursor:pointer;list-style:none;padding:15px 0;font-weight:600;display:flex;align-items:center;gap:12px}
details.more summary::-webkit-details-marker{display:none}
details.more summary::before{content:"+";display:grid;place-items:center;width:24px;height:24px;border-radius:50%;border:1px solid var(--line-strong);font:500 16px/1 var(--sans);color:var(--muted);flex:none;transition:transform .2s}
details.more[open] summary::before{content:"−"}
details.more > div{padding:0 0 8px 36px}

/* ---------- quotes ---------- */
.quote{margin:28px 0;padding:4px 0 4px 22px;border-left:2px solid var(--fg)}
.quote blockquote{margin:0}
.quote blockquote p{font:italic 400 1.2rem/1.5 var(--serif);color:var(--fg);margin:0 0 8px}
.quote figcaption{font-size:13px;color:var(--muted);letter-spacing:.01em}
.quote figcaption::before{content:"";display:inline-block;width:16px;height:1px;background:var(--muted);vertical-align:middle;margin-right:8px}

/* ---------- cards (karten / fehler) ---------- */
.cards{list-style:none;padding:0!important;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:22px 0}
.cards li{margin:0;background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:18px 18px 16px;position:relative}
.cards .c-t{display:block;font-weight:650;margin-bottom:6px;line-height:1.35}
.cards .c-x{font-size:15.5px;color:var(--fg2);line-height:1.55}
.cards.num{counter-reset:c}
.cards.num li{counter-increment:c;padding-top:48px}
.cards.num li::before{content:counter(c,decimal-leading-zero);position:absolute;top:16px;left:18px;font:600 13px/1 var(--sans);color:var(--pen);background:var(--pen-wash);padding:6px 8px;border-radius:6px;font-variant-numeric:tabular-nums}
.cards.levels li{border-top:3px solid var(--c,var(--line-strong))}

/* ---------- feedback (red pen) ---------- */
.fb-grid{display:grid;gap:16px;margin:22px 0}
@media (min-width:720px){.fb-grid{grid-template-columns:1fr 1fr}}
.fb{margin:0;background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:18px 20px 16px;position:relative;box-shadow:var(--shadow)}
.fb::before{content:"";position:absolute;left:0;top:18px;bottom:18px;width:3px;border-radius:0 3px 3px 0;background:var(--pen)}
.fb figcaption{font-size:13px;color:var(--muted);margin:0 0 10px;display:flex;justify-content:space-between;align-items:center;gap:10px}
.fb figcaption b{color:var(--pen);font-weight:600}
.fb blockquote{margin:0}
.fb blockquote p{font:italic 400 1.1rem/1.5 var(--serif);margin:0;color:var(--fg)}
.fb mark{font-style:italic}
.copy{font:500 12.5px/1 var(--sans);color:var(--muted);background:transparent;border:1px solid var(--line-strong);border-radius:999px;padding:6px 10px;cursor:pointer;flex:none}
.copy:hover{color:var(--fg);border-color:var(--fg2)}
.copy[data-done]{color:var(--a2);border-color:var(--a2)}

/* ---------- rubric ---------- */
.rubric-wrap{margin:26px 0 8px;background:var(--sheet);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.dist-wrap{padding:18px 20px 14px;border-bottom:1px solid var(--line)}
.dist-h{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:10px;font-size:13px;color:var(--muted)}
.dist-h b{color:var(--fg);font-weight:600;font-size:14px}
.dist{display:flex;gap:2px;height:30px}
.seg{position:relative;display:flex;align-items:center;justify-content:center;color:#fff;font:600 12px/1 var(--sans);font-variant-numeric:tabular-nums;min-width:0;cursor:default;outline:none}
.seg:first-child{border-radius:6px 0 0 6px}.seg:last-child{border-radius:0 6px 6px 0}
.a1{background:var(--a1)}.a2{background:var(--a2)}.a3{background:var(--a3)}.a4{background:var(--a4)}
.seg[data-tip]:hover::after,.seg[data-tip]:focus::after{content:attr(data-tip);position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);white-space:nowrap;background:var(--fg);color:var(--bg);font:500 12.5px/1.2 var(--sans);padding:7px 9px;border-radius:7px;z-index:5;box-shadow:var(--shadow)}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;margin:10px 0 0;padding:0;list-style:none;font-size:13px;color:var(--fg2)}
.legend li{display:flex;align-items:center;gap:7px;margin:0}
.legend i,.chip i{width:10px;height:10px;border-radius:3px;display:inline-block;flex:none}
.tools{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px;padding:12px 20px;border-bottom:1px solid var(--line);background:var(--soft)}
.tools[hidden]{display:none}
.seg-ctl{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--muted)}
.seg-ctl div{display:inline-flex;background:var(--sheet);border:1px solid var(--line);border-radius:999px;padding:3px}
.seg-ctl button{font:600 13px/1 var(--sans);color:var(--fg2);background:transparent;border:0;border-radius:999px;padding:7px 11px;cursor:pointer;font-variant-numeric:tabular-nums}
.seg-ctl button[aria-pressed="true"]{background:var(--fg);color:var(--bg)}
.tool-btns{display:flex;gap:8px;flex-wrap:wrap}
.ghost{font:600 13px/1 var(--sans);color:var(--fg);background:var(--sheet);border:1px solid var(--line-strong);border-radius:999px;padding:8px 13px;cursor:pointer;display:inline-flex;align-items:center;gap:7px}
.ghost:hover{border-color:var(--fg2)}
.ghost[aria-pressed="true"]{background:var(--pen-wash);border-color:var(--pen);color:var(--pen)}
.ghost svg{width:14px;height:14px}
table.rubric{width:100%;border-collapse:collapse;font-size:15.5px}
table.rubric thead th{font:600 12px/1 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);text-align:left;padding:12px 20px;border-bottom:1px solid var(--line)}
table.rubric thead th:last-child,table.rubric td.pts,table.rubric tfoot td:last-child{text-align:right}
table.rubric tr.area th{text-align:left;padding:16px 20px 6px;font-weight:600;font-size:14.5px}
table.rubric tr.area th span{color:var(--muted);font-weight:500;font-size:13px;margin-left:6px}
.chip{display:inline-flex;align-items:center;gap:8px}
table.rubric td{padding:9px 20px;vertical-align:top;border-bottom:1px solid var(--line);line-height:1.5}
table.rubric tr.last td{border-bottom:0}
table.rubric td.pts{white-space:nowrap;font-variant-numeric:tabular-nums;font-weight:600;width:7.5rem}
table.rubric tfoot td{padding:14px 20px;border-top:2px solid var(--fg);font-weight:650}
table.rubric tfoot .pct{color:var(--muted);font-weight:500;margin-left:8px}
.stepper{display:inline-flex;align-items:center;gap:6px}
.stepper button{width:26px;height:26px;border-radius:50%;border:1px solid var(--line-strong);background:var(--sheet);color:var(--fg);font:600 15px/1 var(--sans);cursor:pointer;display:grid;place-items:center;padding:0}
.stepper button:hover{border-color:var(--fg)}
.stepper output{min-width:3.6em;text-align:center}
.stepper .of{color:var(--muted);font-weight:400}
.rubric-note{font-size:13px;color:var(--muted);padding:10px 20px 14px;margin:0;border-top:1px solid var(--line)}
@media (max-width:560px){table.rubric td,table.rubric thead th,table.rubric tr.area th,table.rubric tfoot td{padding-left:14px;padding-right:14px}.dist-wrap,.tools{padding-left:14px;padding-right:14px}table.rubric td.pts{width:auto}.stepper button{width:30px;height:30px}}

/* ---------- generic tables ---------- */
.table{overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:14px;background:var(--sheet)}
.table table{border-collapse:collapse;width:100%;font-size:15px}
.table th,.table td{text-align:left;vertical-align:top;padding:11px 16px;border-bottom:1px solid var(--line);line-height:1.5}
.table thead th{font:600 12px/1.2 var(--sans);letter-spacing:.07em;text-transform:uppercase;color:var(--muted);background:var(--soft)}
.table tbody tr:last-child td,.table tbody tr:last-child th{border-bottom:0}
.table td.num{white-space:nowrap;text-align:right;font-variant-numeric:tabular-nums}
.versus thead th:nth-child(n+2){font:600 15px/1.2 var(--sans);letter-spacing:0;text-transform:none;color:var(--fg)}
.versus tbody th{font-weight:600;font-size:14px;color:var(--fg2);width:24%;background:var(--soft)}
.versus .us{background:color-mix(in srgb,var(--primary-wash) 55%,transparent)}
@media (max-width:640px){
  .versus table,.versus tbody,.versus tr,.versus th,.versus td{display:block;width:100%}
  .versus thead{display:none}
  .versus tbody tr{border-bottom:1px solid var(--line);padding:6px 0}
  .versus tbody th{background:transparent;padding:10px 14px 2px;border:0;font-size:12px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
  .versus td{border:0;padding:4px 14px 6px}
  .versus td::before{content:attr(data-label);display:block;font-weight:600;font-size:13px;color:var(--fg)}
}

/* ---------- timeline ---------- */
.timeline{list-style:none;padding:0!important;margin:24px 0;position:relative}
.timeline::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:2px;background:var(--line)}
.timeline li{position:relative;padding:0 0 22px 34px;margin:0}
.timeline li::before{content:"";position:absolute;left:0;top:6px;width:16px;height:16px;border-radius:50%;background:var(--sheet);border:2px solid var(--line-strong)}
.timeline li:last-child::before{border-color:var(--pen);background:var(--pen)}
.timeline .t-d{display:block;font:600 12.5px/1.2 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.timeline li:last-child .t-d{color:var(--pen)}
.timeline .t-x{display:block}

/* ---------- flow ---------- */
.flow{list-style:none;padding:0!important;margin:24px 0;display:grid;gap:10px;counter-reset:f}
.flow li{counter-increment:f;margin:0;display:grid;grid-template-columns:auto 1fr;gap:4px 14px;align-items:start;background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.flow .who{grid-row:span 2;font:600 11.5px/1 var(--sans);letter-spacing:.07em;text-transform:uppercase;padding:7px 9px;border-radius:7px;white-space:nowrap;margin-top:1px}
.flow .who.teacher{background:var(--pen-wash);color:var(--pen)}
.flow .who.tool{background:var(--primary-wash);color:var(--primary-ink)}
.flow .who.pupil{background:var(--soft);color:var(--fg2);box-shadow:inset 0 0 0 1px var(--line-strong)}
.flow .step{font-weight:600;line-height:1.35;hyphens:auto;-webkit-hyphens:auto;overflow-wrap:break-word}
.flow .det{hyphens:auto;-webkit-hyphens:auto}
.flow .det{font-size:15px;color:var(--fg2);line-height:1.5}
@media (max-width:480px){.flow .who{white-space:normal;max-width:6.5rem}}
@media (min-width:760px){.flow{grid-template-columns:repeat(min(var(--n,4),4),minmax(0,1fr))}.flow li{grid-template-columns:1fr;align-content:start}.flow .who{grid-row:auto;justify-self:start;margin-bottom:8px}}

/* ---------- chooser ---------- */
.chooser{margin:24px 0;background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}
.chooser-q{font:600 1.15rem/1.35 var(--serif);margin:0 0 14px}
.chooser-list{list-style:none;padding:0!important;margin:0}
.chooser-list li{margin:0 0 14px}
.chooser-list .opt{font-weight:650;margin:0 0 4px}
.chooser-list .ans p{margin:0 0 8px;color:var(--fg2)}
.chooser.js .chooser-list{display:none}
.chooser-opts{display:flex;flex-direction:column;gap:8px}
.chooser-opts button{text-align:left;font:500 15.5px/1.4 var(--sans);color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 14px 12px 44px;cursor:pointer;position:relative}
.chooser-opts button::before{content:"";position:absolute;left:14px;top:50%;width:18px;height:18px;margin-top:-9px;border-radius:50%;border:2px solid var(--line-strong);background:var(--sheet)}
.chooser-opts button[aria-pressed="true"]{border-color:var(--primary);background:var(--primary-wash)}
.chooser-opts button[aria-pressed="true"]::before{border-color:var(--primary);box-shadow:inset 0 0 0 4px var(--sheet);background:var(--primary)}
.chooser-out{margin-top:14px;padding:16px 18px;border-radius:12px;background:var(--soft);border-left:3px solid var(--primary)}
.chooser-out:empty{display:none}
.chooser-out p{margin:0 0 8px}.chooser-out p:last-child{margin:0}

/* ---------- figures ---------- */
.fig{margin:30px 0}
.fig figcaption{font-size:13.5px;color:var(--muted);margin-top:12px;line-height:1.5}
.fig figcaption b{color:var(--fg2);font-weight:600}
.plan{background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:20px;display:grid;gap:8px;box-shadow:var(--shadow)}
.plan .row{display:grid;grid-template-columns:8.5rem 1fr;gap:14px;align-items:center}
.plan .lbl{font:600 13px/1.3 var(--sans);color:var(--fg2)}
.plan .blk{position:relative;border-radius:9px;padding:10px 12px;font-size:14px;line-height:1.4;background:var(--soft);border:1px solid var(--line);min-height:42px;display:flex;align-items:center}
.plan .blk.w{width:var(--w,100%)}
.plan .blk.arg{background:color-mix(in srgb,var(--a1) 13%,var(--sheet));border-color:color-mix(in srgb,var(--a1) 35%,var(--line))}
.plan .blk.gegen{background:repeating-linear-gradient(135deg,var(--sheet) 0 7px,color-mix(in srgb,var(--pen) 10%,var(--sheet)) 7px 9px);border:1px dashed color-mix(in srgb,var(--pen) 55%,var(--line))}
.plan .blk.end{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.plan .blk em{font-style:normal;font-weight:600;margin-right:6px}
@media (max-width:560px){.plan .row{grid-template-columns:1fr;gap:4px}.plan .blk.w{width:100%}}
.letter{display:grid;gap:18px}
@media (min-width:760px){.letter{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);align-items:start}}
.sheet{background:var(--sheet);border:1px solid var(--line);border-radius:6px;padding:26px 26px 22px;box-shadow:var(--shadow);position:relative}
.sheet .part{position:relative;padding:12px 0 8px 34px;border-radius:6px;min-height:40px}
.sheet .part + .part{margin-top:6px}
.sheet .n,.notes .n{position:absolute;left:0;top:9px;width:22px;height:22px;border-radius:50%;background:var(--pen);color:#fff;font:700 12px/22px var(--sans);text-align:center}
.notes .n{position:static;display:inline-block;flex:none}
.sheet .ln{display:block;height:8px;border-radius:4px;background:var(--line);margin:6px 0}
.sheet .ln.s{width:42%}.sheet .ln.m{width:72%}.sheet .ln.l{width:96%}
.sheet .ln.hl{background:color-mix(in srgb,var(--pen) 28%,var(--line))}
.sheet .tag{display:block;font:600 12px/1.3 var(--sans);color:var(--pen);margin-bottom:2px}
.notes{list-style:none;padding:0!important;margin:0;display:grid;gap:12px}
.notes li{display:flex;gap:12px;margin:0;align-items:flex-start}
.notes b{display:block;font-weight:600;line-height:1.35}
.notes span.x{display:block;font-size:14.5px;color:var(--fg2);line-height:1.5}
.curve{background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:18px 18px 12px;box-shadow:var(--shadow)}
.curve svg{display:block;width:100%;height:auto}
.curve .ax{display:grid;grid-template-columns:repeat(var(--n,4),1fr);font:600 12.5px/1.3 var(--sans);color:var(--fg2);text-align:center;margin-top:8px;gap:4px}
.curve .ax small{display:block;font-weight:400;color:var(--muted);font-size:12px}
.curve .lg{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:13px;color:var(--fg2);margin:0 0 10px;padding:0;list-style:none}
.curve .lg li{display:flex;align-items:center;gap:8px;margin:0}
.curve .lg i{width:22px;height:0;border-top:3px solid var(--primary);display:inline-block}
.curve .lg i.bad{border-top:3px dashed var(--pen)}
.curve path.good{stroke:var(--primary)}.curve path.bad{stroke:var(--pen)}
.curve circle.good{fill:var(--primary)}.curve circle.bad{fill:var(--pen)}
.curve line.grid{stroke:var(--line)}
.curve circle{stroke:var(--sheet);stroke-width:2}

/* ---------- cta / end matter ---------- */
section.cta{margin-top:72px;background:var(--fg);color:var(--bg);border-radius:20px;padding:30px 28px 26px}
section.cta .sec-k{color:color-mix(in srgb,var(--bg) 60%,transparent)}
section.cta h2{color:var(--bg)}
section.cta p{color:color-mix(in srgb,var(--bg) 82%,transparent)}
section.cta a:not(.btn){color:var(--bg)}
section.cta .btn{background:var(--bg);color:var(--fg)!important}
section.cta .btn:hover{background:var(--soft)}
section.cta .flow li{background:color-mix(in srgb,var(--bg) 8%,transparent);border-color:color-mix(in srgb,var(--bg) 18%,transparent)}
section.cta .flow .det{color:color-mix(in srgb,var(--bg) 75%,transparent)}
.faq{margin-top:72px}
.faq details{border-bottom:1px solid var(--line)}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:18px 40px 18px 0;font:600 1.12rem/1.4 var(--serif);position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:50%;width:9px;height:9px;margin-top:-7px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(-135deg);margin-top:-2px}
.faq details p{margin:0 0 18px;color:var(--fg2)}
.related{margin-top:56px}
.related ul{list-style:none;padding:0!important;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.related li{margin:0}
.related a{display:block;height:100%;background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:16px 18px;text-decoration:none;color:var(--fg);font-weight:600;line-height:1.35;transition:border-color .15s,transform .15s}
.related a:hover{border-color:var(--primary);transform:translateY(-2px)}
.related a small{display:block;font-weight:500;font-size:12px;letter-spacing:.07em;text-transform:uppercase;color:var(--primary);margin-bottom:6px}
.sources{margin-top:56px;font-size:14.5px}
.sources ol{padding-left:1.4em}
.sources li{margin:8px 0;overflow-wrap:anywhere;color:var(--fg2)}
.sources .k{display:inline-block;font:600 10.5px/1 var(--sans);letter-spacing:.07em;text-transform:uppercase;padding:4px 6px;border-radius:5px;margin-left:6px;vertical-align:1px;background:var(--soft);color:var(--muted)}
.sources .k.primary{background:var(--primary-wash);color:var(--primary-ink)}
.sources .d{color:var(--muted)}
h2.small{font:600 12px/1 var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}

footer.site{border-top:1px solid var(--line);margin-top:80px;padding:28px 0 44px;font-size:14px;color:var(--muted)}
footer.site .in{max-width:72rem;margin:0 auto;padding-inline:max(16px,env(safe-area-inset-left,0px)) max(16px,env(safe-area-inset-right,0px));display:grid;gap:10px}
footer.site a{color:var(--muted);margin-right:16px}
footer.site p{margin:0}

/* ---------- phrasing bank ---------- */
.phr{margin:26px 0;background:var(--sheet);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.phr-h{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.phr-h b{color:var(--fg);font-size:14.5px;font-weight:650}
.phr-body{padding:4px 20px 10px}
.phr-g + .phr-g{border-top:1px solid var(--line)}
.phr-t{font:600 12px/1 var(--sans);letter-spacing:.09em;text-transform:uppercase;color:var(--pen);margin:18px 0 6px}
.phr ol{list-style:none;padding:0!important;margin:0 0 8px}
.phr li{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin:0;padding:10px 0;border-top:1px dashed var(--line)}
.phr li:first-child{border-top:0}
.phr-x{font:italic 400 1.06rem/1.5 var(--serif);color:var(--fg)}
@media (max-width:560px){.phr-h,.phr-body{padding-left:14px;padding-right:14px}.phr-h{flex-direction:column;gap:2px}}

/* ---------- grading-key calculator ---------- */
.calc{margin:26px 0;background:var(--sheet);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.calc-in{padding:18px 20px;border-bottom:1px solid var(--line);background:var(--soft);display:grid;gap:16px}
.calc-row{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px 20px}
.calc label{display:grid;gap:6px;font-size:13px;color:var(--muted);font-weight:500}
.calc input[type=number]{font:600 16px/1 var(--sans);color:var(--fg);background:var(--sheet);border:1px solid var(--line-strong);border-radius:10px;padding:10px 12px;width:7.5rem;font-variant-numeric:tabular-nums}
.calc input[type=number]:focus{outline:2px solid var(--primary);outline-offset:1px;border-color:var(--primary)}
.calc-grades{border:0;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(8.5rem,1fr));gap:12px}
.calc-grades legend{font:600 12px/1 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;padding:0}
.calc-pct{display:flex;align-items:center;gap:6px;color:var(--fg2)}
.calc-pct input[type=number]{width:5.5rem}
.calc-err{margin:0;color:var(--pen);font-size:14px;font-weight:600}
.calc .calc-t{margin:0;border:0;border-radius:0}
.calc .calc-t th[scope=row]{font-weight:600;color:var(--fg)}
.calc .calc-t tr.hit th,.calc .calc-t tr.hit td{background:var(--primary-wash)}
.calc-check{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px 18px;padding:16px 20px;border-top:1px solid var(--line)}
.calc-check output{font:600 1.25rem/1.2 var(--serif);color:var(--fg);flex:1;min-width:10rem;padding-bottom:8px}
.calc-check output small{display:block;font:500 13px/1.3 var(--sans);color:var(--muted)}
.calc figcaption{font-size:13.5px;color:var(--muted);padding:12px 20px 16px;border-top:1px solid var(--line);line-height:1.5;margin:0}
.calc figcaption b{color:var(--fg2)}
@media (max-width:560px){.calc-in,.calc-check,.calc figcaption{padding-left:14px;padding-right:14px}.calc-grades{grid-template-columns:1fr 1fr}}

/* ---------- blog overview ---------- */
[hidden]{display:none!important}
.blog{max-width:72rem;margin:0 auto;padding-inline:max(16px,env(safe-area-inset-left,0px)) max(16px,env(safe-area-inset-right,0px))}
.blog-hero{max-width:44rem;margin:0 0 30px}
.blog-hero h1{font-size:clamp(2.4rem,5.4vw,3.4rem);margin-bottom:14px}
.blog-hero .lead{margin-bottom:10px}
.blog-meta{font-size:14px;color:var(--muted);margin:0}
.finder{display:grid;gap:14px;margin:0 0 22px}
.search{display:flex;align-items:center;gap:10px;max-width:40rem;height:52px;padding:0 10px 0 18px;background:var(--sheet);border:1px solid var(--line-strong);border-radius:999px;box-shadow:var(--shadow);cursor:text;transition:border-color .15s}
.search:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-wash),var(--shadow)}
.search svg{width:19px;height:19px;color:var(--muted);flex:none}
.search input{flex:1;min-width:0;height:100%;border:0;outline:0;background:transparent;color:var(--fg);font:400 16px/1 var(--sans)}
.search input::placeholder{color:var(--muted)}
.search input::-webkit-search-cancel-button{cursor:pointer}
.search kbd{font:600 12px/1 var(--sans);color:var(--muted);border:1px solid var(--line-strong);border-bottom-width:2px;border-radius:6px;padding:4px 8px;flex:none}
.search:focus-within kbd{display:none}
.facets{display:flex;flex-wrap:wrap;gap:8px}
.facets button{display:inline-flex;align-items:center;gap:8px;font:600 14px/1 var(--sans);color:var(--fg2);background:var(--sheet);border:1px solid var(--line);border-radius:999px;padding:9px 14px;cursor:pointer;transition:border-color .15s,background .15s}
.facets button:hover{border-color:var(--fg2)}
.facets button span{font-weight:500;color:var(--muted);font-variant-numeric:tabular-nums}
.facets button[aria-pressed="true"]{background:var(--fg);border-color:var(--fg);color:var(--bg)}
.facets button[aria-pressed="true"] span{color:color-mix(in srgb,var(--bg) 65%,transparent)}
.count{font-size:13.5px;color:var(--muted);margin:0 0 16px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.posts{list-style:none;margin:0;padding:0;display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(min(100%,19rem),1fr))}
.post{margin:0;min-width:0}
.post a{display:flex;flex-direction:column;height:100%;background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:20px 22px 0;color:var(--fg);text-decoration:none;transition:border-color .15s,transform .15s,box-shadow .15s}
.post a:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow);color:var(--fg)}
.post .kicker{margin-bottom:12px}
.post .kicker span{font-size:11px;padding:5px 9px}
.post h2{font:600 1.42rem/1.22 var(--serif);margin:0 0 8px}
.post a:hover h2{color:var(--primary-ink)}
.post-d{font-size:15.5px;line-height:1.55;color:var(--fg2);margin:0 0 18px}
.post-viz{margin:0 0 18px}
.post-viz .dist{height:8px}
.post-viz .seg:first-child{border-radius:4px 0 0 4px}.post-viz .seg:last-child{border-radius:0 4px 4px 0}
.post-viz small{display:flex;flex-wrap:wrap;gap:2px 10px;margin-top:8px;font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.post-viz small span{white-space:nowrap}
.post-viz small span:first-child{color:var(--fg2);font-weight:600}
.post-m{display:flex;flex-wrap:wrap;gap:4px 14px;margin:auto 0 0;padding:13px 0 15px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.empty{text-align:center;padding:48px 16px;border:1px dashed var(--line-strong);border-radius:16px;color:var(--fg2)}
.empty p{margin:0 0 14px}
.empty b{color:var(--fg)}
@media (max-width:560px){.search kbd{display:none}.post a{padding:18px 18px 0}.post h2{font-size:1.3rem}}

@media (max-width:560px){body{font-size:16.5px}nav.site .login{display:none}.lead{font-size:1.08rem;line-height:1.5}.byline{gap:4px 14px}.byline .dot{display:none}.dist-h{flex-direction:column;gap:2px}article section{margin-top:52px}.glance,.chooser{padding:18px 16px 6px}.sheet{padding:20px 16px}section.cta{padding:24px 20px 22px;border-radius:16px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.finder,header.site,footer.site,.crumbs,.btn,.toc-side,.toc-inline,.tools,.progress,.copy,.related{display:none!important}body{font-size:11pt;background:#fff;color:#000}section.cta{background:none;color:#000;padding:0}a{color:inherit;text-decoration:none}.page{display:block}}
@media (forced-colors:active){.seg{border:1px solid CanvasText}.seg:nth-child(even){background-image:repeating-linear-gradient(45deg,transparent 0 4px,CanvasText 4px 5px)}}
mark.verify{background:var(--pen-wash);color:var(--pen);font:600 .82em/1.4 var(--sans);padding:1px 5px;border-radius:4px;outline:1px dashed var(--pen)}
.byline b.draft{color:var(--pen)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}