/* My Exams. Layout: sticky top bar (mark + tabs), one centred column max 820px; white cards on a cool grey ground.
   Colour is reserved for meaning: green = right, red = wrong (also the logo's tick and cross); ink buttons; everything else neutral. */
:root{
  --bg:#f3f4f7; --surface:#ffffff; --sunk:#eef0f4; --ink:#151a23; --muted:#5f6776; --line:#e1e4ea;
  --ok:#17845a; --ok-soft:#e3f3ec; --bad:#c73a36; --bad-soft:#fbe7e6; --warn:#a46510; --warn-soft:#fbf1e1;
  --focus:#2d6cdf;
  --display:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;
  --body:"IBM Plex Sans",ui-sans-serif,system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  --r:14px; --shadow:0 1px 2px rgba(20,26,35,.05),0 6px 20px -12px rgba(20,26,35,.18);
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0f1218; --surface:#171b23; --sunk:#1d222c; --ink:#e9ecf2; --muted:#9aa3b2; --line:#2a303b;
  --ok:#4cc38a; --ok-soft:#14301f; --bad:#f06b66; --bad-soft:#3a1c1c; --warn:#e6ad55; --warn-soft:#33270f; --focus:#7aa7ff;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 24px -14px rgba(0,0,0,.6); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0f1218; --surface:#171b23; --sunk:#1d222c; --ink:#e9ecf2; --muted:#9aa3b2; --line:#2a303b;
  --ok:#4cc38a; --ok-soft:#14301f; --bad:#f06b66; --bad-soft:#3a1c1c; --warn:#e6ad55; --warn-soft:#33270f; --focus:#7aa7ff;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 24px -14px rgba(0,0,0,.6); color-scheme:dark}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{background:var(--bg);color:var(--ink);font:16px/1.55 var(--body);-webkit-font-smoothing:antialiased}
.topbar{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar .in{max-width:820px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto;text-decoration:none;color:inherit}
.brand svg{width:34px;height:34px;flex:none}
.brand b{font:800 22px/1 var(--display);letter-spacing:-.02em}
.tabs{display:flex;gap:4px;background:var(--sunk);padding:4px;border-radius:999px}
.tabs button{border:0;background:transparent;min-height:36px;padding:8px 14px;border-radius:999px;font:600 14px var(--body);color:var(--muted)}
.tabs button[aria-current="page"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.wrap{max-width:820px;margin:0 auto;padding-inline:16px;padding-block:24px 64px;display:flex;flex-direction:column;gap:18px}
.meta{font:500 12px/1.4 var(--mono);color:var(--muted);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow);min-width:0}
.hero{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}
.hero h2{font:700 32px/1.1 var(--display);margin:0 0 8px;letter-spacing:-.02em;text-wrap:balance}
.hero p{margin:0;color:var(--muted);max-width:56ch}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
button{font:600 15px/1 var(--body);cursor:pointer;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:12px 16px;min-height:44px;transition:border-color .15s,background .15s,transform .1s}
button:hover{border-color:var(--ink)}
button:active{transform:translateY(1px)}
button:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
button.primary{background:var(--ink);color:var(--surface);border-color:var(--ink)}
button.primary:hover{opacity:.9}
button.ghost{background:transparent}
button[disabled]{opacity:.45;cursor:default}
.vitals{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.vital{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;min-width:0}
.vital .k{font:500 11px/1.2 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.vital .v{font:700 30px/1.15 var(--display);font-variant-numeric:tabular-nums;margin-top:6px}
.vital .v small{font:500 13px var(--mono);color:var(--muted)}
.ring{width:96px;height:96px}
.ring circle{fill:none;stroke-width:9}
.ring .bg{stroke:var(--sunk)} .ring .fg{stroke:var(--ok);stroke-linecap:round;transition:stroke-dashoffset .6s}
.ring text{fill:var(--ink);font:700 20px var(--display);text-anchor:middle;dominant-baseline:central}
.sect-h{display:flex;justify-content:space-between;align-items:baseline;gap:8px;margin:0 0 14px;flex-wrap:wrap}
.sect-h h3{font:700 19px var(--display);margin:0}
.sect-h span{font:12px var(--mono);color:var(--muted)}
.subjects{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.subj{display:flex;flex-direction:column;gap:8px;text-align:left;padding:13px 14px;font-weight:500;min-width:0;background:var(--surface)}
.subj .row{display:flex;justify-content:space-between;gap:8px;font-size:14px}
.subj .row b{font:500 12px var(--mono);color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.bar{height:6px;border-radius:3px;background:var(--sunk);overflow:hidden}
.bar i{display:block;height:100%;background:var(--muted)}
.bar i.good{background:var(--ok)} .bar i.mid{background:var(--warn)} .bar i.low{background:var(--bad)}
.qhead{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.pips{display:flex;gap:4px;flex-wrap:wrap}
.pip{width:22px;height:6px;border-radius:3px;background:var(--sunk)}
.pip.cur{background:var(--ink)} .pip.ok{background:var(--ok)} .pip.bad{background:var(--bad)} .pip.done{background:var(--muted)}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{font:500 11px/1 var(--mono);text-transform:uppercase;letter-spacing:.06em;padding:6px 9px;border-radius:999px;background:var(--sunk);color:var(--muted)}
.tag.diff3{color:var(--ink)}
.stem{font:400 18px/1.6 var(--body);margin:16px 0 18px;max-width:66ch}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{display:grid;grid-template-columns:34px 1fr auto;gap:12px;align-items:center;text-align:left;font-weight:400;padding:11px 14px;line-height:1.45}
.opt .L{font:600 14px/32px var(--mono);width:32px;height:32px;border-radius:8px;background:var(--sunk);text-align:center}
.opt .mk{width:22px;height:22px}
.opt[disabled]{cursor:default;opacity:.7}
.opt.right[disabled],.opt.wrong[disabled]{opacity:1}
.opt.right{background:var(--ok-soft);border-color:var(--ok)} .opt.right .L{background:var(--ok);color:var(--surface)}
.opt.wrong{background:var(--bad-soft);border-color:var(--bad)} .opt.wrong .L{background:var(--bad);color:var(--surface)}
.opt.picked{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.verdict{display:flex;align-items:center;gap:10px;font:700 20px var(--display);margin:18px 0 8px}
.verdict svg{width:26px;height:26px;flex:none}
.verdict.ok{color:var(--ok)} .verdict.bad{color:var(--bad)}
.expl{max-width:66ch}
.source{margin-top:14px;border-left:3px solid var(--line);background:var(--sunk);padding:10px 14px;border-radius:0 10px 10px 0;font-size:14px}
.source q{display:block;font-style:italic;margin:4px 0 6px}
.source a,.fc-src a{color:var(--ink);font-weight:600;word-break:break-word}
.qfoot{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:18px}
.kbd{font:12px var(--mono);color:var(--muted)}
.timer{font:600 15px var(--mono);font-variant-numeric:tabular-nums}
.review{display:flex;flex-direction:column;margin-top:12px}
.review>div{display:grid;grid-template-columns:24px 1fr;gap:10px;font-size:14px;padding:10px 0;border-bottom:1px solid var(--line)}
.review svg{width:20px;height:20px;margin-top:2px}
.sync{font:12px var(--mono);color:var(--muted)}
.note{font-size:13px;color:var(--muted)}
.tflist{display:flex;flex-direction:column;gap:6px}
.tfrow{display:grid;grid-template-columns:24px 1fr auto;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.tfrow.right{background:var(--ok-soft);border-color:var(--ok)} .tfrow.wrong{background:var(--bad-soft);border-color:var(--bad)}
.tfn{font:600 14px var(--mono);color:var(--muted)} .tft{min-width:0} .tfx{display:block;margin-top:4px}
.tfbtns{display:flex;gap:6px} .tfbtn{min-height:38px;padding:8px 12px;font-size:14px} .tfbtn.on{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.drugs{display:flex;align-items:center;gap:10px;margin:14px 0 2px;flex-wrap:wrap}
.drug{flex:1 1 160px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:var(--sunk)}
.drug b{display:block;font:700 17px/1.2 var(--display)} .drug span{font-size:13px;color:var(--muted)}
.plus{font:700 22px var(--display);color:var(--muted)}
.body{display:block;width:100%;max-width:260px;margin:12px auto;touch-action:manipulation}
.body polygon{fill:var(--line);stroke:var(--surface);stroke-width:.6;transition:fill .15s}
.body.click polygon{cursor:pointer} .body.click polygon:hover{fill:var(--muted)}
.body polygon.hl{fill:var(--ink)} .body polygon.pk{fill:var(--muted)} .body polygon.ok{fill:var(--ok)} .body polygon.bad{fill:var(--bad)}
.libsrc{font-size:12px;color:var(--muted);margin-top:8px}
.warnbox{border-radius:10px;padding:10px 14px;background:var(--warn-soft);font-size:14px;margin:0 0 14px}
/* flashcards */
.decks{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}
.deck{display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:left;padding:16px}
.deck b{font:700 18px var(--display)} .deck span{font:12px var(--mono);color:var(--muted)}
.fc{perspective:1600px;margin-top:14px}
.fc-inner{position:relative;display:grid;transition:transform .5s cubic-bezier(.2,.7,.2,1);transform-style:preserve-3d;cursor:pointer}
.fc.flip .fc-inner{transform:rotateY(180deg)}
.fc-face{grid-area:1/1;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px;display:flex;flex-direction:column;gap:12px;min-width:0}
.fc-back{transform:rotateY(180deg)}
.fc-img{background:#fff;border-radius:10px;display:flex;justify-content:center;align-items:center;overflow:hidden;max-height:58vh}
.fc-img img{max-width:100%;max-height:58vh;object-fit:contain;display:block}
.fc-prompt{font:600 18px/1.4 var(--display)}
.fc-ans{font:700 24px/1.25 var(--display);letter-spacing:-.01em}
.fc-src{font-size:12px;color:var(--muted)}
.grade{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
.grade button{display:flex;flex-direction:column;align-items:center;gap:4px}
.grade small{font:500 11px var(--mono);color:var(--muted)}
.grade .again{border-color:var(--bad);color:var(--bad)} .grade .good{border-color:var(--ok);color:var(--ok)}
@media (max-width:600px){
  .hero{grid-template-columns:1fr} .ring{display:none}
  .vitals{grid-template-columns:repeat(2,1fr)}
  .stem{font-size:17px} .hero h2{font-size:26px}
  .tfrow{grid-template-columns:20px 1fr}.tfbtns{grid-column:2}
  .tabs{width:100%;justify-content:space-between} .tabs button{flex:1;padding:8px 6px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

.wm{font:800 23px/1 var(--display);letter-spacing:-.02em;display:inline-flex;align-items:baseline;white-space:nowrap}
.wm .xm{width:.66em;height:.66em;margin:0 .02em;align-self:baseline;transform:translateY(.02em)}
.wm.big{font-size:40px}
.signin{min-height:100vh;display:grid;place-items:center;padding-inline:16px;padding-block:24px}
.signin form{width:min(400px,100%);display:flex;flex-direction:column;gap:10px}
.signin label{font:600 13px var(--body);margin-top:8px}
.signin input{font:16px var(--body);padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);min-height:46px}
.signin input:focus-visible{outline:3px solid var(--focus);outline-offset:1px}
.signin .note{margin:0}
.fc-face .tag{align-self:flex-start}
.decks .deck span:first-of-type{color:var(--ink);font-family:var(--body);font-size:13px}
/* flashcard answer figure: same image, labelled with the answer (2026-10-21) */
.fc-ansfig{position:relative;margin:0}
.fc-ansfig .fc-img{box-shadow:inset 0 0 0 3px #2BC48A}
.fc-ansfig .fc-lab{position:absolute;left:10px;top:10px;max-width:calc(100% - 20px);background:rgba(14,22,48,.88);color:#fff;border-radius:10px;padding:7px 11px;box-shadow:0 4px 14px rgba(0,0,0,.25);border-left:4px solid #2BC48A}
.fc-ansfig .fc-lab span{display:block;font:700 10px/1 system-ui,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:#7EF0E2;margin-bottom:3px}
.fc-ansfig .fc-lab b{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font:600 14px/1.3 var(--display)}
/* content protection (2026-10-21) */
body{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
input,textarea,select,[contenteditable=true]{-webkit-user-select:text;user-select:text}
img{-webkit-user-drag:none;user-drag:none}
#mx-wm{position:fixed;inset:0;pointer-events:none;z-index:2147483000;background-repeat:repeat}
html.mx-shield body>*:not(#mx-wm){filter:blur(18px);transition:filter .05s}
@media print{body *{display:none!important}body::before{content:'Printing is disabled for My Exams\2122  content.';display:block;font:600 18px sans-serif;padding:40px}}

/* ---------- app shell: left sidebar on desktop, bottom bar on phones ---------- */
:root{--side:236px;--hero-bg:#141a24;--hero-ink:#f1f3f7;--hero-muted:#a9b1bf;--accent:#2d6cdf;--accent-soft:#e7eefc}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--hero-bg:#1e2533;--hero-ink:#f1f3f7;--hero-muted:#a9b1bf;--accent:#7aa7ff;--accent-soft:#1b2740}}
:root[data-theme="dark"]{--hero-bg:#1e2533;--hero-ink:#f1f3f7;--hero-muted:#a9b1bf;--accent:#7aa7ff;--accent-soft:#1b2740}
.app{display:grid;grid-template-columns:var(--side) minmax(0,1fr);min-height:100vh}
.side{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:18px;padding:22px 14px;border-right:1px solid var(--line);background:var(--surface)}
.side .brand{padding:0 10px;margin:0}
.nav{display:flex;flex-direction:column;gap:2px}
.nav button{display:flex;align-items:center;gap:12px;border:0;background:transparent;color:var(--muted);font:600 15px var(--body);padding:11px 12px;border-radius:10px;text-align:left;min-height:44px}
.nav button svg{width:20px;height:20px;flex:none;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.nav button:hover{background:var(--sunk);color:var(--ink)}
.nav button[aria-current="page"]{background:var(--accent-soft);color:var(--accent)}
.side-foot{margin-top:auto;display:flex;flex-direction:column;gap:6px;padding:0 12px;font:12px var(--mono);color:var(--muted)}
.side-foot a{color:var(--muted)}
.mtop{display:flex;justify-content:space-between;align-items:center;gap:12px;max-width:900px;margin:0 auto;padding:20px 28px 0}
.mtop .mbrand{display:none}
.main .wrap{max-width:900px;padding-inline:28px}
/* richer dashboard hero */
.panel.hero{background:var(--hero-bg);color:var(--hero-ink);border-color:transparent}
.panel.hero p{color:var(--hero-muted)}
.panel.hero button{background:transparent;color:var(--hero-ink);border-color:rgba(255,255,255,.22)}
.panel.hero button:hover{border-color:var(--hero-ink)}
.panel.hero button.primary{background:var(--hero-ink);color:var(--hero-bg);border-color:var(--hero-ink)}
.panel.hero .ring .bg{stroke:rgba(255,255,255,.12)} .panel.hero .ring text{fill:var(--hero-ink)}
.vital{position:relative;overflow:hidden}
.vital::after{content:"";position:absolute;inset:auto 0 0 0;height:3px;background:var(--accent);opacity:.7}
/* question bank builder */
.qb{display:grid;gap:18px}
.qb fieldset{border:0;padding:0;margin:0;min-width:0}
.qb legend{font:600 12px var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;padding:8px 14px;cursor:pointer;font-size:14px;background:var(--surface);min-height:40px}
.chip input{position:absolute;opacity:0;pointer-events:none}
.chip b{font:500 12px var(--mono);color:var(--muted)}
.chip:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.chip:has(input:checked) b{color:var(--accent)}
.chip:has(input:focus-visible){outline:3px solid var(--focus);outline-offset:2px}
.row-btns{display:flex;gap:8px;margin-top:10px}
button.sm{min-height:34px;padding:7px 12px;font-size:13px}
/* performance */
.spark{display:grid;grid-template-columns:repeat(14,1fr);gap:6px;align-items:end;height:140px}
.sb{position:relative;height:100%;display:flex;flex-direction:column;justify-content:flex-end;align-items:stretch}
.sb i{display:block;border-radius:4px 4px 0 0;position:absolute;left:0;right:0;bottom:18px}
.sb i.all{background:var(--sunk)} .sb i.ok{background:var(--ok)}
.sb span{font:11px var(--mono);color:var(--muted);text-align:center}
.perf{display:flex;flex-direction:column}
.prow{display:grid;grid-template-columns:minmax(0,1.4fr) 2fr 52px 90px;gap:14px;align-items:center;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent;text-align:left;font-weight:500;padding:12px 4px}
.prow b{font:600 14px var(--mono);text-align:right} .prow small{font:12px var(--mono);color:var(--muted);text-align:right}
/* flashcard groups */
.groups{display:flex;flex-direction:column;gap:18px}
.grp{display:flex;flex-direction:column;gap:14px}
.grp-h{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}
.grp-h h3{font:700 22px var(--display);margin:0 0 4px}
.grp-h .note{margin:0}
.grp-n{text-align:right;flex:none} .grp-n b{display:block;font:700 28px/1 var(--display);color:var(--accent)} .grp-n span{font:12px var(--mono);color:var(--muted)}
.grp>button.primary{align-self:flex-start}
.mini{display:block;width:100%;height:4px;border-radius:2px;background:var(--sunk);overflow:hidden;margin-top:4px}
.mini i{display:block;height:100%;background:var(--ok)}
/* card turn + entrance */
.fc{transition:opacity .35s ease,transform .35s ease}
.fc.enter{opacity:0;transform:translateX(28px)}
.fc-inner{transition:transform .6s cubic-bezier(.3,.7,.2,1)}
.fc-face{min-height:260px;box-shadow:var(--shadow)}
.fc-front{justify-content:center}
@media (max-width:900px){
  .app{grid-template-columns:1fr}
  .side{position:fixed;inset:auto 0 0 0;top:auto;height:auto;flex-direction:row;padding:6px 8px calc(6px + env(safe-area-inset-bottom,0px));border-right:0;border-top:1px solid var(--line);z-index:10}
  .side .brand,.side-foot{display:none}
  .nav{flex-direction:row;justify-content:space-around;width:100%}
  .nav button{flex-direction:column;gap:3px;font-size:11px;padding:6px 4px;flex:1;align-items:center}
  .mtop{padding:14px 16px 0} .mtop .mbrand{display:inline-flex}
  .main .wrap{padding-inline:16px;padding-bottom:110px}
  .prow{grid-template-columns:minmax(0,1fr) 1fr 44px}.prow small{display:none}
  .grp-h{flex-direction:column}.grp-n{text-align:left}
}

/* My Exams theme v3 — "night-shift monitor".
   Deep indigo sidebar + a luminous hero panel with a live ECG trace (the one animated moment);
   light, airy work surface; teal = progress/active, violet = depth, green/red keep their right/wrong meaning.
   Type: Unbounded (display, used for wordmark, hero and section titles only) + Instrument Sans (everything else). */
:root{
  --navy:#0f1733; --navy-2:#18234a; --teal:#12b5a6; --teal-2:#0b8f84; --violet:#6c5cf5; --glow:#7ef0e2;
  --bg:#f4f6fb; --surface:#ffffff; --sunk:#edf0f7; --ink:#121a33; --muted:#5d6782; --line:#e3e7f1;
  --accent:var(--teal-2); --accent-soft:#e2f6f3; --focus:#6c5cf5;
  --display:"Unbounded",ui-sans-serif,system-ui,sans-serif;
  --body:"Instrument Sans",ui-sans-serif,system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
  --r:18px; --shadow:0 1px 2px rgba(18,26,51,.04),0 12px 32px -18px rgba(18,26,51,.25);
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0b1024; --surface:#131a33; --sunk:#1a2242; --ink:#e8ecf8; --muted:#97a1bd; --line:#253058;
  --accent:#3fd6c6; --accent-soft:#12303a; --navy:#080d1f; --navy-2:#121a38; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0b1024; --surface:#131a33; --sunk:#1a2242; --ink:#e8ecf8; --muted:#97a1bd; --line:#253058;
  --accent:#3fd6c6; --accent-soft:#12303a; --navy:#080d1f; --navy-2:#121a38; color-scheme:dark}
body{font-family:var(--body);background:var(--bg)}
/* sidebar */
.side{background:var(--navy);border-right:0;color:#c9d1ea;padding:26px 16px}
.side .wm{color:#fff}
.wm{font-family:var(--display);font-weight:700;letter-spacing:-.03em}
.nav button{color:#9aa6c9;border-radius:12px;font-weight:500}
.nav button:hover{background:var(--navy-2);color:#fff}
.nav button[aria-current="page"]{background:linear-gradient(90deg,rgba(18,181,166,.22),rgba(108,92,245,.18));color:#fff;box-shadow:inset 3px 0 0 var(--glow)}
.side-foot,.side-foot a{color:#7c88ad}
.mtop .sync{font-family:var(--body);font-size:13px}
/* headings */
.sect-h h3,.grp-h h3{font-family:var(--display);font-weight:600;font-size:18px;letter-spacing:-.01em}
.sect-h span{font-family:var(--body)}
.panel{border-radius:var(--r);border-color:var(--line);box-shadow:var(--shadow)}
/* hero */
.panel.hero{position:relative;overflow:hidden;border:0;color:#fff;padding:30px 30px 84px;
  background:radial-gradient(120% 140% at 0% 0%,#1d2a63 0%,transparent 55%),radial-gradient(90% 120% at 100% 100%,rgba(18,181,166,.55) 0%,transparent 60%),linear-gradient(135deg,#121b45,#2a2370)}
.panel.hero>*{position:relative;z-index:1}
.panel.hero .hello{margin:0 0 6px;color:var(--glow);font-weight:600;font-size:14px}
.panel.hero h2{font-family:var(--display);font-weight:600;font-size:30px;line-height:1.15;letter-spacing:-.02em;color:#fff}
.panel.hero p{color:#c3cbe6}
.panel.hero button{border-radius:12px;border-color:rgba(255,255,255,.25);color:#fff;background:rgba(255,255,255,.06);backdrop-filter:blur(6px)}
.panel.hero button.primary{background:#fff;color:var(--navy);border-color:#fff}
.panel.hero button.primary:hover{background:var(--glow);border-color:var(--glow);opacity:1}
.panel.hero .ring .bg{stroke:rgba(255,255,255,.14)} .panel.hero .ring .fg{stroke:var(--glow)} .panel.hero .ring text{fill:#fff;font-family:var(--display)}
.trace{position:absolute!important;z-index:0!important;left:0;right:0;bottom:6px;width:100%;height:70px;opacity:.55;pointer-events:none}
.trace path{fill:none;stroke:var(--glow);stroke-width:2;stroke-linejoin:round;stroke-dasharray:1400;stroke-dashoffset:1400;animation:draw 2.4s cubic-bezier(.4,.1,.2,1) .2s forwards;filter:drop-shadow(0 0 6px rgba(126,240,226,.7))}
@keyframes draw{to{stroke-dashoffset:0}}
/* stat tiles */
.vitals{gap:14px}
.vital{border-radius:16px;padding:16px 18px;box-shadow:var(--shadow)}
.vital::after{height:4px;background:linear-gradient(90deg,var(--teal),var(--violet));opacity:1}
.vital .k{font-family:var(--body);text-transform:none;letter-spacing:0;font-size:13px;font-weight:500}
.vital .v{font-family:var(--display);font-weight:600;font-size:28px}
/* tiles, chips, buttons */
button{border-radius:12px;font-family:var(--body)}
button.primary{background:linear-gradient(135deg,var(--teal-2),#1f6fd6);border:0;color:#fff}
button.primary:hover{opacity:.92}
.subj,.deck,.chip{border-radius:14px}
.subj:hover,.deck:hover{border-color:var(--accent);transform:translateY(-1px)}
.bar,.mini{height:6px;border-radius:99px}
.bar i,.mini i{border-radius:99px}
.bar i.good,.mini i{background:linear-gradient(90deg,var(--teal),#2fd08a)}
.grp-n b{font-family:var(--display);font-weight:600;background:linear-gradient(135deg,var(--teal),var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}
.chip:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.tag{font-family:var(--body);text-transform:none;letter-spacing:0;font-size:12px;font-weight:600;background:var(--accent-soft);color:var(--accent)}
.kbd,.sync,.note{font-family:var(--body)}
/* quiz */
.stem{font-size:18.5px}
.opt{border-radius:14px}
.opt:not([disabled]):hover{border-color:var(--accent);background:var(--accent-soft)}
.opt .L{border-radius:10px;font-family:var(--body);font-weight:700}
.pip.cur{background:linear-gradient(90deg,var(--teal),var(--violet))}
.verdict{font-family:var(--display);font-weight:600;font-size:19px}
/* flashcards */
.fc-face{border-radius:20px}
.fc-front{background:linear-gradient(160deg,var(--surface) 60%,var(--accent-soft))}
.fc-prompt{font-family:var(--body);font-weight:600;font-size:20px}
.fc-ans{font-family:var(--display);font-weight:600;font-size:22px}
.grade button{border-radius:14px}
/* sign-in */
.signin{background:radial-gradient(80% 80% at 10% 0%,#1d2a63,transparent 60%),radial-gradient(70% 90% at 100% 100%,rgba(18,181,166,.5),transparent 60%),linear-gradient(135deg,#0f1733,#2a2370)}
.signin form{border:0}
.signin .wm.big{font-size:34px}
@media (max-width:900px){
  .side{background:var(--navy);padding:6px 8px calc(6px + env(safe-area-inset-bottom,0px))}
  .nav button[aria-current="page"]{box-shadow:inset 0 3px 0 var(--glow)}
  .panel.hero{padding:24px 20px 80px} .panel.hero h2{font-size:24px}
}
@media (prefers-reduced-motion:reduce){.trace path{animation:none;stroke-dashoffset:0}}

/* ---------- v3.1: learn switch, question screen, performance ---------- */
.fc-back{position:relative;padding-bottom:58px}
.learn-sw{position:absolute;right:14px;bottom:14px;display:inline-flex;align-items:center;gap:10px;min-height:36px;padding:6px 14px 6px 6px;border-radius:999px;font-size:13px;font-weight:600;color:var(--muted);background:var(--sunk);border:1px solid var(--line)}
.learn-sw .knob{position:relative;width:34px;height:20px;border-radius:99px;background:var(--line);transition:background .2s}
.learn-sw .knob::after{content:"";position:absolute;top:3px;left:3px;width:14px;height:14px;border-radius:50%;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.25);transition:transform .2s}
.learn-sw[aria-expanded="true"]{color:var(--accent);border-color:var(--accent)}
.learn-sw[aria-expanded="true"] .knob{background:linear-gradient(90deg,var(--teal),var(--violet))}
.learn-sw[aria-expanded="true"] .knob::after{transform:translateX(14px)}
.learn{margin-top:14px;border-radius:18px;padding:18px 20px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);animation:rise .3s ease}
.learn dl{display:grid;grid-template-columns:max-content 1fr;gap:10px 18px;margin:0}
.learn dt{font-weight:600;color:var(--muted);font-size:13px;padding-top:2px}
.learn dd{margin:0;min-width:0;line-height:1.55;max-width:70ch}
.learn-link{margin:14px 0 0;font-size:14px} .learn-link a{color:var(--accent);font-weight:600}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media (max-width:600px){.learn dl{grid-template-columns:1fr;gap:4px}.learn dd{margin-bottom:8px}}
/* question screen */
.qpanel{padding:0;overflow:hidden}
.qpanel>.qhead{padding:16px 26px;background:linear-gradient(90deg,var(--navy),#2a2370);color:#dfe5f7}
.qpanel>.qhead .kbd,.qpanel>.qhead .timer{color:#dfe5f7}
.qpanel .pips{flex:1;gap:5px;min-width:0}
.qpanel .pip{flex:1;max-width:44px;height:6px;background:rgba(255,255,255,.16)}
.qpanel .pip.cur{background:var(--glow)} .qpanel .pip.ok{background:#2fd08a} .qpanel .pip.bad{background:#ff6b6b} .qpanel .pip.done{background:rgba(255,255,255,.5)}
.qpanel>:not(.qhead){margin-left:26px;margin-right:26px}
.qpanel>.tags{margin-top:20px!important}
.qpanel .stem{font-size:19px;line-height:1.65;margin:16px 26px 22px}
.qpanel .opts{gap:10px}
.qpanel .opt{padding:14px 16px;background:var(--surface);box-shadow:0 1px 0 var(--line)}
.qpanel .opt:not([disabled]):hover{transform:translateX(3px)}
.qpanel .opt:not([disabled]):hover .L{background:linear-gradient(135deg,var(--teal),var(--violet));color:#fff}
.insight{margin-top:16px;border-radius:16px;padding:16px 18px;background:var(--accent-soft);border-left:4px solid var(--teal)}
.insight h4{margin:0 0 6px;font:600 14px var(--display);color:var(--accent)}
.qpanel .source{border-radius:16px;border-left:4px solid var(--violet);background:var(--sunk)}
.qpanel>.qfoot{margin:22px 0 0;padding:16px 26px;border-top:1px solid var(--line);background:var(--sunk)}
@media (max-width:600px){.qpanel>.qhead{padding:14px 16px}.qpanel>:not(.qhead){margin-left:16px;margin-right:16px}.qpanel .stem{margin:14px 16px 18px;font-size:17px}.qpanel>.qfoot{padding:14px 16px}}
/* performance */
.perf-hero{display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center;border:0;color:#fff;
  background:radial-gradient(90% 120% at 100% 0%,rgba(108,92,245,.55),transparent 60%),radial-gradient(80% 120% at 0% 100%,rgba(18,181,166,.45),transparent 60%),linear-gradient(135deg,#121b45,#1d1a55)}
.donut{width:168px;height:168px}
.donut .bgc{fill:none;stroke:rgba(255,255,255,.12);stroke-width:12}
.donut .fgc{fill:none;stroke:url(#dg);stroke-width:12;stroke-linecap:round;transition:stroke-dashoffset 1s ease}
.donut text{fill:#fff;font:600 26px var(--display);text-anchor:middle} .donut text.sm{font:500 12px var(--body);fill:#b9c2e2}
.ph-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px 24px}
.ph-stats b{display:block;font:600 26px var(--display)} .ph-stats b small{font:500 13px var(--body);color:#b9c2e2} .ph-stats span{font-size:13px;color:#c3cbe6}
.ph-stages{grid-column:1/-1;display:grid;grid-template-columns:repeat(2,1fr);gap:10px 28px}
.stg{display:grid;grid-template-columns:72px 1fr 44px;gap:10px;align-items:center;font-size:13px;color:#c3cbe6}
.stg .bar{background:rgba(255,255,255,.14)} .stg b{color:#fff;text-align:right;font-weight:600}
@media (max-width:600px){.perf-hero{grid-template-columns:1fr;justify-items:center}.ph-stages{grid-template-columns:1fr;width:100%}.ph-stats{width:100%}}

/* ---------- v3.2: full-width work area, knowledge-network hero, card counters ---------- */
.main .wrap{max-width:none;margin:0;padding-inline:28px;padding-block:18px 48px}
.mtop{max-width:none;margin:0;padding:18px 28px 0}
.panel.hero{min-height:300px;padding-bottom:30px;background:
  radial-gradient(60% 90% at 85% 40%,rgba(108,92,245,.45),transparent 70%),
  radial-gradient(70% 100% at 0% 100%,rgba(18,181,166,.35),transparent 65%),
  linear-gradient(135deg,#070c22 0%,#101a45 55%,#1c1550 100%)}
.panel.hero>div{max-width:62%}
canvas.neuro{position:absolute!important;inset:0;width:100%;height:100%;z-index:0!important;pointer-events:none;
  -webkit-mask-image:linear-gradient(90deg,transparent 0%,rgba(0,0,0,.35) 30%,#000 60%);mask-image:linear-gradient(90deg,transparent 0%,rgba(0,0,0,.35) 30%,#000 60%)}
.panel.hero::after{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:linear-gradient(transparent 50%,rgba(126,240,226,.04) 50%);background-size:100% 4px;mix-blend-mode:screen}
.panel.hero .ring{filter:drop-shadow(0 0 12px rgba(126,240,226,.55))}
.vitals{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel.fc-count{padding:0;border:0;background:none;box-shadow:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-bottom:18px}
.panel.fc-count>div{border-radius:16px;padding:16px 18px;color:#fff;background:linear-gradient(135deg,#121b45,#2a2370);box-shadow:var(--shadow);position:relative;overflow:hidden}
.panel.fc-count>div::after{content:"";position:absolute;right:-20px;top:-20px;width:90px;height:90px;border-radius:50%;background:radial-gradient(circle,rgba(126,240,226,.35),transparent 70%)}
.panel.fc-count b{display:block;font:600 28px var(--display)} .panel.fc-count span{font-size:13px;color:#c3cbe6}
@media (max-width:1100px){.vitals{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:900px){.main .wrap{padding-inline:12px;padding-bottom:110px}.mtop{padding:12px 12px 0}.panel.hero>div{max-width:none}}
@media (max-width:600px){.vitals{grid-template-columns:repeat(2,minmax(0,1fr))}.panel.fc-count{grid-template-columns:1fr 1fr 1fr;gap:8px}.panel.fc-count>div{padding:12px}.panel.fc-count b{font-size:22px}}

.gchk{display:inline-block;margin-top:6px;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600}
.gchk.match{background:var(--ok-soft);color:var(--ok)} .gchk.partial{background:var(--warn-soft);color:var(--warn)}
.gchk.unconfirmed,.gchk.absent{background:var(--bad-soft);color:var(--bad)}
.fc-back .fc-img{max-height:34vh} .fc-back .fc-img img{max-height:34vh}

/* study card for research (Stage 4) questions */
.qpanel .study{margin:16px 26px 0;padding:16px 18px;border:1px solid var(--line, #d9dde3);border-left:4px solid var(--ok, #17845a);border-radius:12px;background:color-mix(in srgb, var(--ok, #17845a) 6%, transparent)}
.study .study-k{font:600 11px/1 var(--mono, monospace);letter-spacing:.08em;text-transform:uppercase;opacity:.7;margin-bottom:6px}
.study h4{margin:0 0 10px;font-size:18px}.study h4 span{font-weight:400;opacity:.7;font-size:14px;margin-left:6px}
.study dl{display:grid;grid-template-columns:max-content 1fr;gap:6px 14px;margin:0 0 10px;font-size:15px;line-height:1.5}
.study dt{font-weight:600;opacity:.75}.study dd{margin:0}.study a{font-size:14px}
.stem .qlabel{display:block;font:600 11px/1 var(--mono, monospace);letter-spacing:.08em;text-transform:uppercase;opacity:.7;margin-bottom:6px}
@media (max-width:600px){.qpanel .study{margin:14px 16px 0}.study dl{grid-template-columns:1fr}.study dt{margin-top:4px}}
.study a{color:var(--ok, #17845a);font-weight:600}

/* ---- dashboard v2 (dash.js, 2026-10-20) ---- */
.dash-hello{margin:4px 0 14px}
.dash-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px;margin-bottom:18px}
.dash-grid>.panel{margin:0}
.dash-nums{display:flex;flex-wrap:wrap;gap:28px;margin:6px 0 18px}
.dash-nums div{display:flex;flex-direction:column}
.dash-nums b{font:600 34px/1.1 var(--display);letter-spacing:-.5px}
.dash-nums span{font-size:14px;opacity:.8}
.dash-ready{display:flex;flex-direction:column;gap:12px}
.dash-ready>button{align-self:flex-start}
.dash-big{font:600 44px/1 var(--display)}
.dash-big.ok{color:var(--ok)}.dash-big.warn{color:var(--warn)}
.dash-req{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}
.dash-fix{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.dash-go{margin-top:8px;font-weight:700;color:var(--ok);font-size:14px}
.dash-week{display:flex;gap:5px;margin-top:8px}
.dash-week span{width:24px;height:24px;border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:11px;background:var(--sunk);color:var(--muted)}
.dash-week span.on{background:var(--ok);color:#fff}
/* ---- sign-in split layout ---- */
.split{display:flex;flex-wrap:wrap;min-height:100vh}
.sside{flex:1 1 420px;min-width:0;background:#121a3b;color:#fff;padding:40px 48px;box-sizing:border-box;display:flex;flex-direction:column;gap:28px}
.sside .wm{color:#fff}
.sside h1{font:600 34px/1.15 var(--display);letter-spacing:-.8px;margin:24px 0 0;max-width:460px}
.sside ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:14px;font-size:17px;color:#c9d0e6}
.sside li::before{content:"";display:inline-block;width:10px;height:6px;border-left:3px solid #2bc48a;border-bottom:3px solid #2bc48a;transform:rotate(-45deg);margin:0 14px 4px 2px}
.sside .sfoot{margin-top:auto;font-size:14px;color:#9aa4c4}
.split .signin{flex:1 1 480px;min-width:0;min-height:auto}
.stitle{font:600 26px var(--display);margin:0 0 6px}
@media (max-width:700px){.sside{padding:28px 20px}.sside h1{font-size:26px}}
.panel.hero.dash-today{display:block;grid-template-columns:none}
.dash-today .btns{display:flex;flex-wrap:wrap;gap:10px}
.dash-grid{align-items:start}
.dash-vitals{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.panel.hero.dash-today>div,.dash-today h2{max-width:none;width:auto}
.dash-today .dash-nums{flex-wrap:wrap}

/* ---- dashboard v2 (dash.js, 2026-10-20): goal ring, streak, trend, milestones, achievements ---- */
.dv2{display:flex;flex-direction:column;gap:18px}
.dv2 .panel{margin:0}
.panel.hero.dv2-hero{display:flex;flex-wrap:wrap;gap:28px;align-items:center;justify-content:space-between;grid-template-columns:none;position:relative;overflow:hidden}
.dv2-hero-l{flex:1 1 420px;min-width:0;position:relative;z-index:1}
.dv2-greet{margin:0 0 6px;font-size:15px;opacity:.85}
.dv2-hero h2{margin:0 0 10px;max-width:none}
.dv2-line{margin:0 0 18px;font-size:16px;line-height:1.55;opacity:.92;max-width:560px}
.dv2-hero .btns{display:flex;flex-wrap:wrap;gap:10px}
.dv2-next{margin:16px 0 0;font-size:14px;opacity:.85}
.dv2-ring-wrap{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:10px;position:relative;z-index:1;margin:0 auto}
.dv2-ring{width:150px;height:150px}
.dv2-ring circle{fill:none;stroke-width:11}
.dv2-ring .bg{stroke:rgba(255,255,255,.14)}
.dv2-ring .fg{stroke:#2bc48a;stroke-linecap:round;transition:stroke-dashoffset .8s ease}
.dv2-ring.met .fg{stroke:#8fe3c2}
.dv2-ring text{fill:#fff;text-anchor:middle}
.dv2-ring .n{font:600 34px var(--display)}
.dv2-ring .s{font-size:12px;opacity:.8}
.dv2-goal{font-size:13px;opacity:.9;display:flex;align-items:center;gap:6px}
.dv2-goal select{font:600 13px var(--body);border-radius:8px;border:1px solid rgba(255,255,255,.3);background:rgba(255,255,255,.1);color:#fff;padding:3px 6px}
.dv2-goal select option{color:#151a23}
.dv2-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.dv2-card{display:flex;flex-direction:column;gap:10px}
.dv2-card .note{margin:0}
.dv2-k{display:flex;align-items:center;gap:8px;font-weight:600;font-size:14px;color:var(--muted)}
.dv2-k svg{width:20px;height:20px;fill:none;stroke:var(--ok);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.dv2-big{font:600 34px/1.1 var(--display);letter-spacing:-.5px}
.dv2-big small{font:500 14px var(--body);color:var(--muted);letter-spacing:0}
.dv2-spark{width:100%;height:60px}
.dv2-spark path{fill:none;stroke:var(--ok);stroke-width:2.2;stroke-linejoin:round;stroke-linecap:round}
.dv2-spark circle{fill:var(--ok)}
.dv2-spark .pm{stroke:var(--line);stroke-dasharray:4 4}
.dash-week span.today{outline:2px solid var(--ok);outline-offset:1px}
.dv2-exam{display:flex;flex-direction:column;gap:12px}
.dv2-date{display:flex;align-items:center;gap:10px;font-weight:600;font-size:14px}
.dv2-date input{font:500 15px var(--body);padding:8px 10px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink)}
.dv2-badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.dv2-badge{border:1px dashed var(--line);border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:4px;opacity:.6}
.dv2-badge.ok{border:1px solid var(--ok);background:var(--ok-soft);opacity:1}
.dv2-badge .ic{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--sunk);color:#fff;font-weight:700;margin-bottom:4px}
.dv2-badge.ok .ic{background:var(--ok)}
.dv2-badge b{font-size:15px}
.dv2-badge small{font-size:12.5px;color:var(--muted);line-height:1.4}
.dv2-confetti{position:absolute;inset:0;pointer-events:none;z-index:2}
.dv2-confetti i{position:absolute;top:-12px;left:calc(5% + var(--i) * 5%);width:8px;height:14px;border-radius:2px;background:hsl(calc(var(--i) * 40),80%,62%);animation:dv2-fall 2.6s ease-in forwards;animation-delay:calc(var(--i) * 0.06s);opacity:0}
@keyframes dv2-fall{0%{opacity:1;transform:translateY(0) rotate(0)}100%{opacity:0;transform:translateY(300px) rotate(540deg)}}
@media (prefers-reduced-motion:reduce){.dv2-confetti{display:none}.dv2-ring .fg{transition:none}}
@media (max-width:600px){.dv2-ring{width:120px;height:120px}.dv2-big{font-size:28px}}
.dv2-spark .pmt{font-size:9px;fill:var(--muted);text-anchor:start}
.dv2-spark .pm{stroke:var(--muted);opacity:.5}

/* ---- dashboard icon animations (2026-10-20) ---- */
.ic-flame{transform-origin:50% 90%}
.ic-flame.lit path{fill:#f59e0b;stroke:#ea580c}
.ic-flame.lit{animation:dv2-flicker 1.6s ease-in-out infinite}
@keyframes dv2-flicker{0%,100%{transform:scale(1) rotate(0)}25%{transform:scale(1.08,1.14) rotate(-3deg)}50%{transform:scale(.96,1.04) rotate(2deg)}75%{transform:scale(1.05,1.1) rotate(-1deg)}}
.ic-trend .ln{stroke-dasharray:1;stroke-dashoffset:1;animation:dv2-draw .9s ease-out .2s forwards}
.ic-trend .hd{opacity:0;animation:dv2-pop .3s ease-out 1s forwards}
.ic-trend{animation:dv2-nudge 3.2s ease-in-out 1.4s infinite}
.ic-trend.down{transform:scaleY(-1)}
@keyframes dv2-nudge{0%,80%,100%{translate:0 0}88%{translate:2px -2px}}
@keyframes dv2-draw{to{stroke-dashoffset:0}}
@keyframes dv2-pop{from{opacity:0;transform:scale(.4)}to{opacity:1;transform:scale(1)}}
.ic-medal .sw{transform-origin:50% 0;animation:dv2-swing 3s ease-in-out infinite}
.ic-medal .star{fill:var(--ok);stroke:none;transform-origin:12px 9px;animation:dv2-twinkle 3s ease-in-out infinite}
@keyframes dv2-swing{0%,100%{transform:rotate(0)}20%{transform:rotate(9deg)}40%{transform:rotate(-7deg)}60%{transform:rotate(3deg)}80%{transform:rotate(0)}}
@keyframes dv2-twinkle{0%,100%{opacity:.35;transform:scale(.8)}50%{opacity:1;transform:scale(1.1)}}
.dv2-ring .fg{animation:dv2-ring 1.1s cubic-bezier(.2,.8,.2,1) both}
@keyframes dv2-ring{from{stroke-dashoffset:var(--c)}to{stroke-dashoffset:var(--off)}}
.dv2-ring.met{animation:dv2-glow 2.4s ease-in-out 1.1s 2}
@keyframes dv2-glow{0%,100%{filter:none}50%{filter:drop-shadow(0 0 10px rgba(143,227,194,.75))}}
.dv2-spark.anim .sl{stroke-dasharray:1;stroke-dashoffset:1;animation:dv2-draw 1.2s ease-out .3s forwards}
.dv2-spark.anim circle{opacity:0;animation:dv2-pop .3s ease-out 1.3s forwards}
.dv2-badge.ok{animation:dv2-rise .5s ease-out both}
.dv2-badge.ok:nth-child(2){animation-delay:.05s}.dv2-badge.ok:nth-child(3){animation-delay:.1s}.dv2-badge.ok:nth-child(4){animation-delay:.15s}.dv2-badge.ok:nth-child(5){animation-delay:.2s}.dv2-badge.ok:nth-child(6){animation-delay:.25s}.dv2-badge.ok:nth-child(7){animation-delay:.3s}.dv2-badge.ok:nth-child(8){animation-delay:.35s}.dv2-badge.ok:nth-child(9){animation-delay:.4s}.dv2-badge.ok:nth-child(10){animation-delay:.45s}.dv2-badge.ok:nth-child(n+11){animation-delay:.5s}
.dv2-badge.ok .ic{animation:dv2-pop .4s ease-out .4s both}
@keyframes dv2-rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.dv2-card{transition:transform .2s ease,box-shadow .2s ease}
.dv2-card:hover{transform:translateY(-2px)}
@media (prefers-reduced-motion:reduce){.ic-flame.lit,.ic-trend,.ic-medal .sw,.ic-medal .star,.dv2-ring.met,.dv2-ring .fg,.dv2-badge.ok,.dv2-badge.ok .ic{animation:none}.ic-trend .ln,.dv2-spark.anim .sl{animation:none;stroke-dashoffset:0}.ic-trend .hd,.dv2-spark.anim circle{animation:none;opacity:1}.dv2-card:hover{transform:none}}

/* brand logo (2026-10-21) */
.brandlogo{display:inline-flex;align-items:flex-start}
.brandlogo img{width:auto;display:block}
.brandlogo sup{font:600 11px var(--body,sans-serif);line-height:1;margin:2px 0 0 3px;color:#fff;vertical-align:baseline}
.mtop .brandlogo sup{color:#151a23}
.sside .brandlogo sup{font-size:14px}
@media (max-width:900px){.mtop .brandlogo img{height:34px!important}}

/* ---- app fixes (2026-10-22): students, dark-mode logo ---- */
.student .nav [data-tab="lib"],.student .nav button[onclick*="preview"],.student #lib{display:none!important}
.brandlogo .lg-d{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .brandlogo .lg-l{display:none}:root:not([data-theme="light"]) .brandlogo .lg-d{display:block}:root:not([data-theme="light"]) .mtop .brandlogo sup{color:#fff}}
:root[data-theme="dark"] .brandlogo .lg-l{display:none}:root[data-theme="dark"] .brandlogo .lg-d{display:block}:root[data-theme="dark"] .mtop .brandlogo sup{color:#fff}
/* ---- achievement badges v2: gold hexagons (2026-10-22) ---- */
.ach-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:16px 12px}
.ach{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;padding:4px 2px 6px;border:0;background:none;box-shadow:none}
.ach .hexb{width:112px;height:auto;display:block;filter:drop-shadow(0 8px 14px rgba(11,20,48,.28));transition:transform .3s ease}
.ach small{font-size:12px;color:var(--muted);line-height:1.35;max-width:150px}
.ach-ok{font:700 10.5px var(--body,sans-serif);letter-spacing:.8px;text-transform:uppercase;color:#8A5A00;background:linear-gradient(135deg,#FFF1B0,#F5C542);border-radius:999px;padding:3px 10px}
.ach-bar{width:78%;height:6px;border-radius:99px;background:var(--sunk,#e6e9f0);overflow:hidden}
.ach-bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#F5C542,#2BC48A)}
.ach-pc{font:600 11px var(--body,sans-serif);color:var(--muted)}
.ach .rays{transform-origin:60px 58px;transform-box:view-box}
.ach .spk{opacity:0}
.ach.locked .hexb{filter:grayscale(1) brightness(.95) opacity(.42)}
.ach.ok .hexb{animation:ach-in .7s cubic-bezier(.2,1.4,.4,1) both;animation-delay:calc(var(--i) * 70ms)}
.ach.ok .rays{animation:ach-spin 18s linear infinite;opacity:.16}
.ach.ok .ico{transform-origin:60px 56px;transform-box:view-box;animation:ach-bob 3s ease-in-out infinite;animation-delay:calc(var(--i) * 180ms)}
.ach.ok .spk{animation:ach-twinkle 2.4s ease-in-out infinite}
.ach.ok:hover .hexb{transform:translateY(-4px) scale(1.04)}
@keyframes ach-in{from{opacity:0;transform:scale(.6) rotate(-8deg)}to{opacity:1;transform:none}}
@keyframes ach-spin{to{transform:rotate(360deg)}}
@keyframes ach-bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}
@keyframes ach-twinkle{0%,100%{opacity:0;transform:scale(.6)}50%{opacity:1;transform:scale(1)}}
@media (prefers-reduced-motion:reduce){.ach.ok .hexb,.ach.ok .rays,.ach.ok .ico,.ach.ok .spk{animation:none}.ach.ok .spk{opacity:.8}}
@media (max-width:560px){.ach-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px 6px}.ach .hexb{width:92px}.ach small{font-size:11px}}

/* ---- exam countdown study buddy (2026-10-22) ---- */
.ex-wrap{display:flex;flex-wrap:wrap;gap:18px;align-items:center}
.ex-ava{position:relative;flex:0 0 auto;width:170px;margin:0 auto}
.ex-ava-svg{width:170px;height:170px;display:block;filter:drop-shadow(0 8px 16px rgba(18,26,59,.15))}
.ex-bubble{position:relative;margin-top:10px;background:var(--surface,#fff);border:1px solid var(--line);border-radius:14px;padding:9px 12px;font-size:13px;line-height:1.45;color:var(--ink);box-shadow:0 4px 12px rgba(18,26,59,.08);animation:ex-in .5s ease-out both}
.ex-bubble:before{content:"";position:absolute;top:-7px;left:50%;width:12px;height:12px;background:inherit;border-left:1px solid var(--line);border-top:1px solid var(--line);transform:translateX(-50%) rotate(45deg)}
.ex-info{flex:1 1 200px;min-width:0;display:flex;flex-direction:column;gap:12px}
.ex-top{display:flex;align-items:center;gap:16px}
.ex-cal{width:76px;flex:none;border-radius:14px;overflow:hidden;background:var(--surface,#fff);border:1px solid var(--line);text-align:center;box-shadow:0 6px 14px rgba(18,26,59,.1)}
.ex-cal .m{display:block;background:#E0534E;color:#fff;font:800 12px var(--body,sans-serif);letter-spacing:1.5px;padding:4px 0}
.ex-cal b{display:block;font:700 30px/1.15 Unbounded,var(--display,sans-serif);color:var(--ink);padding-top:4px}
.ex-cal .y{display:block;font-size:11px;color:var(--muted);padding:0 0 6px}
.ex-cal.empty .m{background:#6366F1}
.ex-days b{display:block;font:700 44px/1 Unbounded,var(--display,sans-serif);letter-spacing:-1px;color:var(--ink)}
.ex-days span{font-size:14px;color:var(--muted);font-weight:600}
.ph-near .ex-days b{color:#EA580C}.ph-day .ex-days b{color:#B7791F}
.ex-roles{display:flex;flex-wrap:wrap;gap:6px}
.ex-roles button{font:600 12.5px var(--body,sans-serif);padding:6px 11px;border-radius:999px;border:1.5px solid var(--line);background:var(--surface,#fff);color:var(--muted);cursor:pointer}
.ex-roles button[aria-checked="true"]{background:var(--ok);border-color:var(--ok);color:#fff}
.ex-body{animation:ex-bob 3.4s ease-in-out infinite;transform-origin:100px 200px;transform-box:view-box}
.ex-eyes{animation:ex-blink 4.2s infinite;transform-origin:100px 93px;transform-box:view-box}
.ex-page{animation:ex-flip 3s ease-in-out infinite;transform-origin:100px 180px;transform-box:view-box}
.ex-glow{animation:ex-glow 2.4s ease-in-out infinite}
.ex-steam{animation:ex-steam 2.2s ease-in-out infinite}
.ex-card{animation:ex-cardup 2.6s ease-in-out infinite;transform-box:view-box;transform-origin:103px 179px}
.ex-tick{animation:ex-spin 4s linear infinite;transform-origin:146px 178px;transform-box:view-box}
.ex-float{animation:ex-bob 2.6s ease-in-out infinite}
.ex-conf{animation:ex-fall 2.8s ease-in infinite;transform-box:view-box}
@keyframes ex-bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}
@keyframes ex-blink{0%,92%,100%{transform:scaleY(1)}95%{transform:scaleY(.1)}}
@keyframes ex-flip{0%,55%,100%{transform:scaleX(1)}75%{transform:scaleX(-1)}}
@keyframes ex-glow{0%,100%{opacity:1}50%{opacity:.75}}
@keyframes ex-steam{0%{opacity:0;transform:translateY(4px)}50%{opacity:1}100%{opacity:0;transform:translateY(-6px)}}
@keyframes ex-cardup{0%,100%{transform:rotate(0)}50%{transform:rotate(6deg) translateY(-3px)}}
@keyframes ex-spin{to{transform:rotate(360deg)}}
@keyframes ex-fall{0%{transform:translateY(-30px) rotate(0);opacity:0}15%{opacity:1}100%{transform:translateY(150px) rotate(360deg);opacity:0}}
@keyframes ex-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.ex-body,.ex-eyes,.ex-page,.ex-glow,.ex-steam,.ex-card,.ex-tick,.ex-float,.ex-conf,.ex-bubble{animation:none}}

/* ---- 3d study buddy (2026-10-22) ---- */
.ex-3d{width:170px;height:196px;margin:0 auto;border-radius:22px;overflow:hidden;background:radial-gradient(circle at 50% 35%,color-mix(in srgb,var(--ok) 14%,transparent),transparent 70%)}
.ex-3d .ex-ava-svg{margin-top:10px}
.ex-3d canvas{width:100%;height:100%;display:block;cursor:grab;touch-action:pan-y}
.ex-3d canvas:active{cursor:grabbing}
/* thought bubble above the buddy, on the left; calendar tile removed */
.ex-ava{display:flex;flex-direction:column;align-items:center;width:220px}
.ex-3d{position:relative}
.ex-3d.live:after{content:"Tap me";position:absolute;bottom:8px;right:8px;font:700 10px var(--body,sans-serif);letter-spacing:.5px;text-transform:uppercase;color:var(--ok);background:var(--ok-soft);border-radius:99px;padding:2px 7px}
.ex-bubble.think{align-self:flex-start;margin:0 0 18px -6px;max-width:190px;border-radius:22px;padding:10px 14px;position:relative}
.ex-bubble.think:before{content:"";position:absolute;top:auto;bottom:-11px;left:auto;right:30px;width:13px;height:13px;border-radius:50%;background:inherit;border:1px solid var(--line);transform:none}
.ex-bubble.think:after{content:"";position:absolute;bottom:-21px;right:20px;width:7px;height:7px;border-radius:50%;background:var(--surface,#fff);border:1px solid var(--line)}
.ex-bubble.think{animation:ex-in .5s ease-out both,ex-think 3.6s ease-in-out .6s infinite}
@keyframes ex-think{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}
@media (prefers-reduced-motion:reduce){.ex-bubble.think{animation:none}}

/* ---- official study buddy in the countdown (2026-10-22) ---- */
.ex-ava{width:240px}
.ex-3d{width:210px;height:262px;background:none;border-radius:0;overflow:visible}
.ex-3d .ex-ava-svg{width:170px;height:170px;margin:40px auto 0}
.ex-3d.live:after{bottom:2px;right:0}

/* ---- buddy big (2026-10-23): no box or tint, tall enough to reach the title line, bubble above-left ---- */
.dv2-exam .ex-wrap{align-items:stretch}
.ex-ava{position:relative;width:300px;max-width:100%;margin:-6px 0 0;display:block;flex:0 0 auto}
.ex-3d{width:230px!important;height:330px!important;margin:0 0 0 auto!important;background:none!important;border-radius:0!important;overflow:visible!important;box-shadow:none!important}
.ex-3d canvas{background:transparent!important}
.ex-3d .ex-ava-svg{margin:90px auto 0}
.ex-bubble.think{position:absolute;top:2px;left:0;z-index:2;max-width:150px;margin:0;font-size:12.5px}
.ex-3d.live:after{bottom:6px;right:6px}
.ex-info{justify-content:center}
@media (max-width:600px){.ex-ava{width:100%}.ex-3d{width:210px!important;height:300px!important;margin:0 auto!important}.ex-bubble.think{max-width:140px}}

/* ---- bubble green (2026-10-23): thought bubble in the site's light green ---- */
.ex-bubble,.ex-bubble.think,.ex-bubble.think:before,.ex-bubble.think:after{background:var(--ok-soft,#E3F3EC);border-color:color-mix(in srgb,var(--ok,#17845A) 35%,transparent)}
.ex-bubble,.ex-bubble.think{color:var(--ink)}
.ex-bubble b,.ex-bubble strong{color:var(--ok)}

/* ---- modern hero (2026-10-23): aurora glow, gradient headline, stat chips, glass ring card, icon buttons ---- */
.panel.hero.dv2-hero{border-radius:24px;border:1px solid rgba(126,240,226,.14);box-shadow:0 20px 50px -20px rgba(16,20,60,.55),inset 0 1px 0 rgba(255,255,255,.06)}
.dv2-hero:before{content:"";position:absolute;width:520px;height:520px;left:-160px;top:-260px;border-radius:50%;z-index:0;pointer-events:none;
  background:radial-gradient(circle,rgba(43,196,138,.28),transparent 62%);filter:blur(10px);animation:dv2-aurora 14s ease-in-out infinite alternate}
@keyframes dv2-aurora{0%{transform:translate(0,0) scale(1)}50%{transform:translate(260px,60px) scale(1.15)}100%{transform:translate(520px,-10px) scale(.95)}}
.dv2-greet{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:99px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);font-size:13px;letter-spacing:.2px;opacity:1}
.dv2-greet:before{content:"";width:7px;height:7px;border-radius:50%;background:#2bc48a;box-shadow:0 0 0 0 rgba(43,196,138,.6);animation:dv2-live 2s ease-out infinite}
@keyframes dv2-live{0%{box-shadow:0 0 0 0 rgba(43,196,138,.6)}100%{box-shadow:0 0 0 9px rgba(43,196,138,0)}}
.dv2-hero h2{font-size:clamp(28px,3.4vw,42px);letter-spacing:-.5px;margin:12px 0 8px}
.dv2-grad{background:linear-gradient(90deg,#7ef0e2,#2bc48a 45%,#a7f3d0 90%);background-size:200% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:dv2-shine 6s ease-in-out infinite}
@keyframes dv2-shine{0%,100%{background-position:0 0}50%{background-position:100% 0}}
.dv2-line{margin-bottom:14px}
.dv2-chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px}
.dv2-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 12px 6px 9px;border-radius:12px;font-size:13px;color:#d6dcf2;
  background:linear-gradient(180deg,rgba(255,255,255,.09),rgba(255,255,255,.03));border:1px solid rgba(255,255,255,.12);backdrop-filter:blur(8px);
  animation:dv2-up .5s cubic-bezier(.2,.8,.2,1) both}
.dv2-chip:nth-child(2){animation-delay:.07s}.dv2-chip:nth-child(3){animation-delay:.14s}.dv2-chip:nth-child(4){animation-delay:.21s}
.dv2-chip b{color:#fff;font-weight:700}
.dv2-chip svg{width:16px;height:16px;fill:none;stroke:#7ef0e2;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
@keyframes dv2-up{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.dv2-hero .btns button{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:14px;font-weight:600;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}
.dv2-hero .btns button:hover{transform:translateY(-2px);box-shadow:0 10px 22px -10px rgba(0,0,0,.6);background:rgba(255,255,255,.12)}
.dv2-hero .btns button.primary{position:relative;overflow:hidden;color:#06261a;border:0;background:linear-gradient(135deg,#7ef0c8,#2bc48a);box-shadow:0 10px 26px -10px rgba(43,196,138,.9)}
.dv2-hero .btns button.primary:hover{background:linear-gradient(135deg,#9af5d6,#34d399);box-shadow:0 14px 30px -10px rgba(43,196,138,1)}
.dv2-hero .btns button.primary:after{content:"";position:absolute;top:0;left:-60%;width:40%;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.55),transparent);transform:skewX(-20deg);animation:dv2-sweep 4.5s ease-in-out 1s infinite}
@keyframes dv2-sweep{0%,70%{left:-60%}100%{left:130%}}
.dv2-bi{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto;opacity:.9}
.dv2-hero .btns button.primary .dv2-bi{transition:transform .2s ease}.dv2-hero .btns button.primary:hover .dv2-bi{transform:translateX(3px)}
.dv2-next{margin:18px 0 0;display:flex;flex-direction:column;gap:7px;max-width:420px;font-size:13.5px;opacity:.9}
.dv2-nbar{display:block;height:6px;border-radius:99px;background:rgba(255,255,255,.12);overflow:hidden}
.dv2-nbar b{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2bc48a,#7ef0e2);box-shadow:0 0 12px rgba(126,240,226,.7);animation:dv2-grow 1.2s cubic-bezier(.2,.8,.2,1) both}
@keyframes dv2-grow{from{width:0!important}}
.dv2-ring-wrap{padding:18px 22px 16px;border-radius:22px;background:linear-gradient(160deg,rgba(255,255,255,.10),rgba(255,255,255,.03));border:1px solid rgba(255,255,255,.14);backdrop-filter:blur(12px);box-shadow:0 18px 40px -18px rgba(0,0,0,.6),inset 0 1px 0 rgba(255,255,255,.08)}
.dv2-ring-k{font-size:11px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:#7ef0e2}
.dv2-ring{filter:drop-shadow(0 0 14px rgba(43,196,138,.45))}
.dv2-ring .fg{stroke:url(#dv2g)}
.dv2-goal select{border-radius:10px;background:rgba(255,255,255,.08);color:#fff;border:1px solid rgba(255,255,255,.2)}
@media (max-width:600px){.dv2-chip{font-size:12px;padding:5px 10px 5px 8px}.dv2-hero .btns button{padding:10px 14px}.dv2-ring-wrap{padding:14px 16px}}
@media (prefers-reduced-motion:reduce){.dv2-hero:before,.dv2-greet:before,.dv2-grad,.dv2-chip,.dv2-hero .btns button.primary:after,.dv2-nbar b{animation:none}}

/* ---- buddy 6 cm and smaller achievement badges (2026-10-23) ---- */
.ex-ava{width:270px}
.ex-3d{width:197px!important;height:283px!important}
.ach .hexb{width:92px}
@media (max-width:600px){.ex-3d{width:180px!important;height:258px!important}}
@media (max-width:560px){.ach .hexb{width:78px}}