/* X Tutoring — diagnostic pages (/diagnostic/…). Loaded after site.css and
   built only from its tokens, so light/dark mode follow the site toggle. */

.dg-page{--ok:#2E7D5B;--ok-bg:#E3F1EA;--warn:#8A5A0B;--warn-bg:#FBEFD6;--bad:var(--marker-text);--bad-bg:#FBE4DC;--muted-bg:var(--band)}
[data-theme="dark"] .dg-page{--ok:#6CC8A0;--ok-bg:#183229;--warn:#E9B65C;--warn-bg:#33291A;--bad:#F2A78E;--bad-bg:#3A231C;--muted-bg:#20262A}

.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- page hero ---------- */
.dg-hero{padding:clamp(48px,7vw,88px) 0 clamp(28px,4vw,40px)}
.dg-hero .lede{margin-top:18px}
.dg-facts{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0 0;padding:0;list-style:none}
.dg-facts li{font-family:var(--mono);font-size:12px;letter-spacing:.04em;background:var(--card);border:1px solid var(--rule);border-radius:100px;padding:6px 12px;color:var(--label)}
.dg-crumb{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--slate);margin:0 0 18px}
.dg-crumb a{color:inherit;text-decoration:none}
.dg-crumb a:hover{color:var(--ink)}

/* ---------- app card ---------- */
.dg-wrap{padding-bottom:clamp(64px,8vw,110px)}
#diag{max-width:780px;background:var(--card);border:1px solid var(--rule);border-radius:22px;padding:clamp(22px,4vw,44px);box-shadow:0 30px 60px -48px rgba(var(--shadow),.55);min-height:320px}
.dg-screen{animation:dgIn .5s var(--blur-ease) both}
@keyframes dgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.dg-screen{animation:none}}
.dg-screen [data-focus]:focus{outline:none}
.dg-step{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate);margin:0 0 12px}
.dg-h{font-size:clamp(24px,3.2vw,34px);line-height:1.12;margin:0 0 22px}
.dg-note{color:var(--label);font-size:15.5px}
.dg-sub{display:block;font-weight:400;color:var(--label);font-size:14px;margin-top:2px}
.dg-err{color:var(--bad);font-size:14.5px;font-weight:500;min-height:1em;margin:8px 0 0}

/* buttons (own set, so the site's flow animation doesn't need its markup) */
.dg-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 15.5px/1 var(--body);
  background:var(--ink);color:var(--paper);border:1px solid var(--ink);border-radius:100px;padding:15px 24px;cursor:pointer;text-decoration:none;
  transition:background .35s ease,border-color .35s ease,color .35s ease,opacity .35s ease}
.dg-btn:hover{background:var(--marker);border-color:var(--marker)}
.dg-btn:disabled{opacity:.35;cursor:not-allowed;background:var(--ink);border-color:var(--ink)}
.dg-btn-ghost{background:transparent;color:var(--ink);border-color:var(--rule-hover)}
.dg-btn-ghost:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.dg-nav{display:flex;align-items:center;gap:12px;margin-top:30px;flex-wrap:wrap}
.dg-nav .dg-btn:last-child{margin-left:auto}
.dg-nav-end{justify-content:flex-end}
.dg-skip{background:none;border:0;padding:8px 4px;font:500 14.5px var(--body);color:var(--label);text-decoration:underline;text-underline-offset:3px;cursor:pointer}
.dg-skip:hover{color:var(--ink)}

/* ---------- mode cards ---------- */
.dg-modes{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.dg-mode{position:relative;text-align:left;display:flex;flex-direction:column;gap:8px;background:var(--paper);color:var(--ink);border:1px solid var(--rule);border-radius:16px;padding:22px 52px 22px 22px;cursor:pointer;font:inherit;transition:border-color .35s ease,transform .45s var(--blur-ease),box-shadow .45s ease}
.dg-mode:hover{border-color:var(--ink);transform:translateY(-2px);box-shadow:0 18px 30px -24px rgba(var(--shadow),.6)}
.dg-mode-t{font-family:var(--display);font-weight:800;font-size:20px;letter-spacing:-.015em;line-height:1.2}
.dg-mode-d{font-size:15px;color:var(--label);line-height:1.5}
.dg-mode-go{position:absolute;right:20px;top:22px;font-size:20px;transition:transform .45s var(--blur-ease)}
.dg-mode:hover .dg-mode-go{transform:translateX(4px);color:var(--marker)}

/* ---------- setup ---------- */
.dg-fs{border:0;padding:0;margin:0 0 26px;min-width:0}
.dg-fs legend{font-weight:600;font-size:16px;padding:0;margin-bottom:12px}
.dg-units{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.dg-unit{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--rule);border-radius:14px;padding:14px 16px;cursor:pointer;background:var(--paper);transition:border-color .3s ease,background .3s ease}
.dg-unit:hover{border-color:var(--rule-hover)}
.dg-unit:has(input:checked){border-color:var(--ink);background:var(--card)}
.dg-unit input{margin-top:4px;accent-color:var(--marker);width:17px;height:17px;flex:none}
.dg-unit-body{display:flex;flex-direction:column;gap:3px}
.dg-unit-t{font-weight:600}
.dg-unit-d{font-size:13.5px;color:var(--label);line-height:1.45}
.dg-chips{display:flex;flex-wrap:wrap;gap:8px}
.dg-chip{position:relative;cursor:pointer}
.dg-chip input{position:absolute;opacity:0;inset:0;cursor:pointer}
.dg-chip span{display:inline-block;font-size:14.5px;font-weight:500;border:1px solid var(--rule);border-radius:100px;padding:8px 14px;background:var(--paper);transition:background .3s ease,color .3s ease,border-color .3s ease}
.dg-chip:hover span{border-color:var(--rule-hover)}
.dg-chip input:checked + span{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.dg-chip input:focus-visible + span{outline:2.5px solid var(--marker);outline-offset:2px}
.dg-prep{margin:0;padding:18px 20px 18px 38px;background:var(--band);border-radius:14px;font-size:15px;line-height:1.55}
.dg-prep li{margin:4px 0}

/* ---------- question ---------- */
.dg-prog{margin-bottom:26px}
.dg-prog-row{display:flex;justify-content:space-between;gap:12px;font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--label);margin-bottom:8px}
.dg-bar{height:4px;background:var(--band);border-radius:4px;overflow:hidden}
.dg-bar i{display:block;height:100%;background:var(--marker);border-radius:4px;transition:width .6s var(--blur-ease)}
.dg-prompt{font-family:var(--body);font-weight:500;font-size:clamp(18px,2.2vw,21px);line-height:1.55;letter-spacing:0;margin:0 0 22px}
.dg-prompt i,.dg-opt-t i,.dg-rev-q i,.dg-why i,.dg-rev dd i{font-family:'Times New Roman',Georgia,serif;font-size:1.08em}
.dg-figure{margin:0 0 22px;overflow-x:auto}
.dg-graph{display:block;width:100%;max-width:440px;height:auto;background:var(--paper);border:1px solid var(--rule);border-radius:12px}
.dg-graph .gr{stroke:var(--rule);stroke-width:1}
.dg-graph .ax{stroke:var(--slate);stroke-width:1.3}
.dg-graph .asym{stroke:var(--slate);stroke-width:1.3;stroke-dasharray:5 4}
.dg-graph .cv{fill:none;stroke:var(--marker);stroke-width:2.6;stroke-linejoin:round}
.dg-graph .pt{fill:var(--ink)}
.dg-graph .tk{font:10.5px var(--mono);fill:var(--label)}
.dg-graph .pl{font:600 11px var(--mono);fill:var(--ink);paint-order:stroke;stroke:var(--paper);stroke-width:3px}
.dg-table{border-collapse:collapse;font-variant-numeric:tabular-nums;font-size:16px}
.dg-table th,.dg-table td{border:1px solid var(--rule);padding:8px 16px;text-align:center}
.dg-table th{background:var(--band);font-weight:600}

.dg-opts{border:0;padding:0;margin:0;display:grid;gap:10px;min-width:0}
.dg-opt{position:relative;display:flex;align-items:center;gap:14px;border:1px solid var(--rule);border-radius:14px;padding:14px 16px;cursor:pointer;background:var(--paper);transition:border-color .3s ease,background .3s ease}
.dg-opt:hover{border-color:var(--rule-hover)}
.dg-opt input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.dg-opt-l{flex:none;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;border:1px solid var(--rule-hover);font:600 13px var(--mono);color:var(--label);transition:background .3s ease,color .3s ease,border-color .3s ease}
.dg-opt-t{font-size:16.5px;line-height:1.5}
.dg-opt:has(input:checked){border-color:var(--ink);background:var(--card);box-shadow:inset 0 0 0 1px var(--ink)}
.dg-opt:has(input:checked) .dg-opt-l{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.dg-opt:has(input:focus-visible){outline:2.5px solid var(--marker);outline-offset:2px}

.dg-numwrap{max-width:340px}
.dg-numlab{display:block;font-weight:600;font-size:14.5px;margin-bottom:8px}
.dg-numbox{display:flex;align-items:center;border:1px solid var(--rule-hover);border-radius:12px;background:var(--paper);padding:0 14px;transition:border-color .3s ease}
.dg-numbox:focus-within{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.dg-num{flex:1;min-width:0;border:0;background:transparent;color:var(--ink);font:500 19px var(--mono);padding:13px 0;outline:none}
.dg-num::placeholder{color:var(--placeholder)}
.dg-unit-pre,.dg-unit-post{font:500 17px var(--mono);color:var(--label)}
.dg-unit-pre{margin-right:6px}.dg-unit-post{margin-left:8px}
.dg-hint{font-size:13.5px;color:var(--bad);min-height:1.2em;margin:6px 0 0}

.dg-conf{border:0;padding:0;margin:24px 0 0;min-width:0;opacity:.35;pointer-events:none;transition:opacity .45s ease}
.dg-conf.on{opacity:1;pointer-events:auto}
.dg-conf legend{font-weight:600;font-size:14.5px;padding:0;margin-bottom:10px}
.dg-seg{display:inline-flex;background:var(--band);border-radius:100px;padding:4px;gap:2px}
.dg-seg-o{position:relative;cursor:pointer}
.dg-seg-o input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.dg-seg-o span{display:block;padding:9px 18px;border-radius:100px;font-size:14.5px;font-weight:500;color:var(--label);transition:background .3s ease,color .3s ease}
.dg-seg-o input:checked + span{background:var(--card);color:var(--ink);box-shadow:0 2px 8px -3px rgba(var(--shadow),.45)}
.dg-seg-o input:focus-visible + span{outline:2.5px solid var(--marker);outline-offset:1px}

/* fractions */
.fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 2px;line-height:1.25}
.fr-n{border-bottom:1.2px solid currentColor;padding:0 3px}
.fr-d{padding:0 3px}

/* ---------- report ---------- */
.dg-sum{font-size:17px;margin:-8px 0 0}
.dg-block{margin-top:34px}
.dg-block h3{font-size:19px;margin:0 0 14px}
.dg-pri{list-style:none;margin:0;padding:0;display:grid;gap:10px;counter-reset:p}
.dg-pri li{counter-increment:p;position:relative;border:1px solid var(--rule);border-radius:14px;padding:16px 18px 14px 52px;background:var(--paper)}
.dg-pri li::before{content:counter(p);position:absolute;left:16px;top:15px;width:24px;height:24px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font:600 12px var(--mono)}
.dg-pri-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:6px}
.dg-pri-skill{font-weight:600}
.dg-pri p{font-size:15px;color:var(--label);margin:0 0 6px;line-height:1.55}
.dg-pri p b{color:var(--ink);font-weight:600}
.dg-code{font-family:var(--mono);font-size:11.5px;color:var(--label);letter-spacing:.03em;white-space:nowrap}
.dg-tag,.dg-rate{flex:none;display:inline-block;font:600 11.5px var(--mono);letter-spacing:.04em;border-radius:100px;padding:4px 9px;white-space:nowrap}
.dg-t-solid,.dg-r-solid{background:var(--ok-bg);color:var(--ok)}
.dg-t-shaky,.dg-t-lucky,.dg-r-shaky{background:var(--warn-bg);color:var(--warn)}
.dg-t-gap,.dg-t-mis,.dg-r-gap{background:var(--bad-bg);color:var(--bad)}
.dg-t-notyet,.dg-t-none,.dg-r-none{background:var(--muted-bg);color:var(--label)}
.dg-strand{border:1px solid var(--rule);border-radius:14px;padding:16px 18px;margin-bottom:10px;background:var(--paper)}
.dg-strand-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px}
.dg-strand-t{font-family:var(--display);font-weight:800;font-size:17px;letter-spacing:-.01em}
.dg-skills{list-style:none;margin:0;padding:0}
.dg-skills li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:8px 0;border-top:1px solid var(--rule);font-size:15px}
.dg-mis{margin:0;padding-left:20px;font-size:15px;line-height:1.55}
.dg-mis li{margin:6px 0}
.dg-mis b{font-weight:600}
.dg-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px;padding-top:28px;border-top:1px solid var(--rule)}
.dg-fine{font-size:13.5px;color:var(--label);margin:12px 0 0}
.dg-rev{border-top:1px solid var(--rule)}
.dg-rev:last-of-type{border-bottom:1px solid var(--rule)}
.dg-rev summary{display:flex;align-items:center;gap:12px;padding:12px 2px;cursor:pointer;list-style:none;font-size:15px}
.dg-rev summary::-webkit-details-marker{display:none}
.dg-rev summary::after{content:'+';margin-left:auto;font:400 18px var(--mono);color:var(--label);transition:transform .35s ease}
.dg-rev[open] summary::after{transform:rotate(45deg)}
.dg-rev-n{font:500 12px var(--mono);color:var(--label);width:20px}
.dg-rev-mark{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700;flex:none}
.dg-m-ok{background:var(--ok-bg);color:var(--ok)}
.dg-m-no{background:var(--bad-bg);color:var(--bad)}
.dg-m-skip{background:var(--muted-bg);color:var(--label)}
.dg-rev-b{padding:4px 2px 18px 34px;font-size:15px}
.dg-rev-q{margin-bottom:12px;line-height:1.55}
.dg-rev dl{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:0 0 10px}
.dg-rev dt{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--label);padding-top:3px}
.dg-rev dd{margin:0}
.dg-why{background:var(--band);border-radius:10px;padding:10px 14px;margin:0}

/* ---------- hub ---------- */
.dg-how{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:0 0 clamp(36px,5vw,56px);padding:0;list-style:none;counter-reset:h}
.dg-how li{counter-increment:h;background:var(--card);border:1px solid var(--rule);border-radius:16px;padding:20px}
.dg-how li::before{content:'0' counter(h);display:block;font:500 12px var(--mono);color:var(--marker-text);letter-spacing:.1em;margin-bottom:10px}
.dg-how b{display:block;font-family:var(--display);font-size:17px;margin-bottom:6px}
.dg-how span{font-size:15px;color:var(--label);line-height:1.5}
.dg-grade{margin-bottom:28px}
.dg-grade h2{font-size:15px;font-family:var(--mono);font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--slate);margin:0 0 12px}
.dg-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:10px}
.dg-course{display:flex;flex-direction:column;gap:4px;height:100%;border:1px solid var(--rule);border-radius:14px;padding:16px 18px;background:var(--card);text-decoration:none;color:var(--ink);transition:border-color .35s ease,transform .45s var(--blur-ease),box-shadow .45s ease}
a.dg-course:hover{border-color:var(--ink);transform:translateY(-2px);box-shadow:0 18px 30px -24px rgba(var(--shadow),.6)}
.dg-course-code{font:600 13px var(--mono);letter-spacing:.06em}
.dg-course-name{font-weight:600;font-size:16px;line-height:1.3}
.dg-course-meta{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:8px;font-size:13.5px;color:var(--label)}
.dg-course-go{font-weight:600;color:var(--marker-text)}
.dg-course.is-soon{background:transparent;border-style:dashed;color:var(--label)}
.dg-course.is-soon .dg-course-name{color:var(--label)}
.dg-privacy{max-width:62ch;font-size:14.5px;color:var(--label);margin-top:clamp(28px,4vw,44px)}

@media (max-width:680px){
  .dg-modes,.dg-units,.dg-how{grid-template-columns:1fr}
  #diag{border-radius:18px}
  .dg-nav{gap:8px}
  .dg-nav .dg-skip{order:3;width:100%;text-align:center}
  .dg-seg{display:flex;width:100%}
  .dg-seg-o{flex:1;text-align:center}
  .dg-seg-o span{padding:9px 6px}
  .dg-pri li{padding-left:46px}
  .dg-pri-head{flex-direction:column;gap:6px}
  .dg-skills li{align-items:flex-start}
  .dg-actions .dg-btn{width:100%}
}