:root{
  --bg:#07101e;--bg2:#101b30;--surface:rgba(15,27,48,.74);--surface-solid:#111e34;
  --card:#f8f6ef;--card-back:#fffdf8;--ink:#101827;--muted-ink:#697386;
  --text:#f6f8fc;--muted:#9faac0;--line:rgba(255,255,255,.11);
  --accent:#6ea8ff;--accent2:#8ec5ff;--good:#4ade80;--review:#fbbf24;--bad:#fb7185;
  --shadow:0 34px 80px rgba(0,0,0,.42);--radius:28px;--ease:cubic-bezier(.2,.75,.25,1);
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}html{min-height:100%;color-scheme:dark}body{margin:0;min-height:100vh;color:var(--text);font-family:var(--sans);background:radial-gradient(900px 600px at 15% -10%,rgba(61,116,205,.24),transparent 60%),radial-gradient(820px 640px at 95% 20%,rgba(124,58,237,.13),transparent 55%),linear-gradient(145deg,var(--bg),var(--bg2));overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;background-image:radial-gradient(rgba(255,255,255,.14) .7px,transparent .7px);background-size:26px 26px;mask-image:linear-gradient(to bottom,rgba(0,0,0,.45),transparent 75%);opacity:.28;z-index:-1}
button,input,textarea,select{font:inherit}.shell,.topbar{width:min(1060px,calc(100% - 44px));margin:auto}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:0;position:relative;z-index:20;background:transparent;backdrop-filter:none}
.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;font-weight:780;letter-spacing:-.02em}.brand::before{content:"★";width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(145deg,#2b64b8,#152b50);border:1px solid rgba(255,255,255,.16);box-shadow:inset 0 1px rgba(255,255,255,.15),0 8px 24px rgba(0,0,0,.18);font-size:20px}.brand-mark{display:none}.dot{color:var(--accent)}
.deck-select{display:flex;align-items:center;gap:8px;color:var(--muted);font:700 10px var(--mono);text-transform:uppercase;letter-spacing:.08em}.deck-select select{border:1px solid var(--line);background:var(--surface);backdrop-filter:blur(18px);color:var(--text);padding:10px 30px 10px 12px;border-radius:13px;outline:none;cursor:pointer}
.intro{padding:10px 0 18px;border-bottom:0;display:flex;justify-content:space-between;gap:24px;align-items:end}.intro>div:first-child{min-width:0}.eyebrow,.kicker,.face-label{font:800 10px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}h1{font-size:clamp(26px,4vw,40px);line-height:1.02;letter-spacing:-.04em;margin:7px 0 0;font-weight:780}h1 span{color:var(--accent)}
.mode-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:5px;border-radius:16px;background:var(--surface);border:1px solid var(--line);backdrop-filter:blur(16px);min-width:min(420px,100%)}.mode-tab{border:0;background:transparent;color:var(--muted);padding:9px 10px;border-radius:11px;cursor:pointer;font:760 12px var(--sans);transition:background .18s var(--ease),color .18s var(--ease),transform .18s var(--ease)}.mode-tab:hover{color:var(--text)}.mode-tab.active{background:rgba(110,168,255,.16);color:var(--text);box-shadow:inset 0 0 0 1px rgba(110,168,255,.20)}.mode-tab small{opacity:.7;color:inherit;margin-left:4px}
.view{display:none;padding:12px 0 48px}.view.active{display:block}.study-layout{display:grid;grid-template-columns:minmax(0,680px) minmax(250px,1fr);gap:24px;align-items:start;justify-content:center}.card-stack{position:relative;padding:0 0 22px}.card-stack::before,.card-stack::after{content:"";position:absolute;inset:12px 18px 10px;border-radius:var(--radius);background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.07);z-index:-1}.card-stack::after{inset:22px 34px 0;opacity:.5;z-index:-2}
.flashcard{position:relative;z-index:2;min-height:465px;border:1px solid rgba(17,24,39,.08);border-radius:var(--radius);background:linear-gradient(160deg,#fffef9 0%,#f6f3e9 100%);box-shadow:var(--shadow);padding:34px clamp(28px,5vw,52px) 30px;display:flex;flex-direction:column;outline:none;cursor:pointer;user-select:none;color:var(--ink);overflow:hidden;transition:transform .2s var(--ease),box-shadow .2s var(--ease)}.flashcard:hover{transform:translateY(-2px)}.flashcard::before{content:"";position:absolute;left:0;right:0;top:0;height:6px;background:linear-gradient(90deg,#c33 0 31%,#f7f7f7 31% 67%,#315fba 67% 100%)}.flashcard:focus-visible{box-shadow:0 0 0 4px rgba(110,168,255,.18),var(--shadow)}
.card-topline{display:flex;justify-content:space-between;align-items:center;min-height:30px}.card-number{font:800 12px var(--sans);color:#3b5f98;letter-spacing:.12em}.card-number::before{content:"QUESTION ";}.state-badge{padding:6px 10px;border-radius:999px;background:rgba(49,95,186,.08);color:#375784;font:780 11px var(--sans);letter-spacing:.06em;text-transform:uppercase}.hidden{display:none!important}
.card-face{display:grid;place-items:center;text-align:center;flex:1;padding:22px 0 28px}.card-face .face-label{display:none}.card-face h2{max-width:560px;font-family:Georgia,"Times New Roman",serif;font-size:clamp(28px,4.2vw,39px);line-height:1.18;letter-spacing:-.025em;margin:0;font-weight:700;color:var(--ink);text-wrap:balance}.tap-hint{align-self:end;color:#778295;font-size:12px;margin:0;text-align:center}.tap-hint::before{content:"↵";display:inline-grid;place-items:center;width:18px;height:18px;border:1px solid rgba(16,24,39,.14);border-radius:6px;font-size:10px;margin-right:7px}
.card-answer{border-top:1px solid rgba(16,24,39,.09);padding-top:20px;margin-top:auto;text-align:center}.card-answer .face-label{color:#5a76a2;font-size:11px;font-weight:850;letter-spacing:.16em}.card-answer p:last-child{font-family:Georgia,"Times New Roman",serif;font-size:clamp(27px,4vw,38px);line-height:1.16;letter-spacing:-.025em;margin:14px auto 0;color:var(--ink);font-weight:700;max-width:560px;text-wrap:balance}
.study-controls{border:1px solid var(--line);border-radius:22px;background:var(--surface);backdrop-filter:blur(18px);padding:18px;position:sticky;top:18px;box-shadow:0 18px 40px rgba(0,0,0,.16)}.progress-block>div:first-child,.test-header>div:first-child{display:flex;justify-content:space-between;gap:15px;color:var(--muted);font:700 10px var(--mono);text-transform:uppercase;letter-spacing:.06em}.progress-track{height:5px;background:rgba(255,255,255,.09);border-radius:999px;overflow:hidden;margin-top:12px}.progress-track i{display:block;height:100%;width:0;border-radius:inherit;background:linear-gradient(90deg,#5c93ee,#9a8cff);transition:width .35s var(--ease)}
.primary-controls,.flag-controls,.jump-row,.results-actions,.after-answer{display:flex;gap:8px;flex-wrap:wrap}.primary-controls{margin-top:20px}.primary-controls button{flex:1}.flag-controls{margin-top:10px}.jump-row{align-items:center;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}.jump-row label{color:var(--muted);font:700 10px var(--mono);text-transform:uppercase}.jump-row input{width:68px;background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--text);padding:10px;border-radius:12px;outline:none}.shortcut-hint{color:var(--muted);font:600 9px/1.6 var(--mono);margin:16px 0 0}.primary,.ghost,.flag-controls button,.jump-row button{border:1px solid var(--line);border-radius:13px;padding:11px 13px;cursor:pointer;transition:transform .18s var(--ease),border-color .18s,background .18s}.primary{background:linear-gradient(135deg,#4d7fd1,#6a66d8);border-color:transparent;color:white;font-weight:780;box-shadow:0 12px 28px rgba(58,92,180,.22)}.primary:hover{transform:translateY(-1px);filter:brightness(1.06)}.ghost,.flag-controls button,.jump-row button{background:rgba(255,255,255,.035);color:var(--text)}.ghost:hover,.flag-controls button:hover,.jump-row button:hover{transform:translateY(-1px);border-color:rgba(110,168,255,.45)}.flag-controls button[aria-pressed="true"]{border-color:rgba(110,168,255,.55);background:rgba(110,168,255,.10)}#reviewBtn{color:#f9c74f}#knowBtn{color:#65e593}.large{padding:14px 18px}
.test-setup{max-width:760px;margin:auto;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(155deg,rgba(18,34,59,.96),rgba(12,23,42,.98));box-shadow:var(--shadow);padding:clamp(26px,5vw,44px);text-align:center}.test-setup h2,.results-card h2{font-size:clamp(30px,5vw,42px);letter-spacing:-.035em;margin:10px 0 12px}.test-setup>p:not(.kicker){color:var(--muted);line-height:1.6;max-width:610px;margin-left:auto;margin-right:auto}.answer-methods{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:28px auto 20px;width:min(100%,560px)}.method-card{display:grid;gap:7px;text-align:left;border:1px solid var(--line);border-radius:15px;background:rgba(255,255,255,.04);color:var(--text);padding:15px;cursor:pointer;transition:.18s var(--ease)}.method-card:hover{transform:translateY(-1px);border-color:rgba(110,168,255,.42)}.method-card strong{font-size:14px}.method-card span{color:var(--muted);line-height:1.45;font-size:11px}.method-card.active{border-color:rgba(110,168,255,.62);background:rgba(110,168,255,.12);box-shadow:inset 0 0 0 1px rgba(110,168,255,.12)}
.test-shell{max-width:820px;margin:auto}.test-header{margin-bottom:14px}.test-card{position:relative;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(155deg,rgba(18,34,59,.96),rgba(12,23,42,.98));box-shadow:var(--shadow);padding:clamp(26px,5vw,44px);min-height:430px;overflow:hidden}.test-card::after{content:"";position:absolute;width:220px;height:220px;right:-90px;top:-90px;border-radius:50%;background:radial-gradient(circle,rgba(110,168,255,.15),transparent 68%);pointer-events:none}.test-card .card-number::before{content:"QUESTION "}.test-card .card-number{color:var(--accent)}.test-card .face-label{margin-top:18px}.test-card h2{font-family:Georgia,"Times New Roman",serif;font-size:clamp(25px,4vw,34px);line-height:1.32;letter-spacing:-.025em;margin:10px 0 28px;color:var(--text);font-weight:700}
.typed-form{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;margin-top:24px}.typed-form textarea{width:100%;resize:vertical;min-height:58px;border:1px solid var(--line);border-radius:15px;background:rgba(255,255,255,.055);color:var(--text);padding:15px 16px;font-size:15px;line-height:1.45;outline:none;transition:border-color .18s,box-shadow .18s}.typed-form textarea:focus{border-color:rgba(110,168,255,.65);box-shadow:0 0 0 4px rgba(110,168,255,.10)}.choice-list{display:grid;gap:10px;margin-top:24px}.choice{display:flex;align-items:flex-start;width:100%;border:1px solid var(--line);background:rgba(255,255,255,.045);color:var(--text);border-radius:15px;padding:13px 14px;text-align:left;cursor:pointer;line-height:1.4;transition:.18s var(--ease)}.choice:hover:not(:disabled){border-color:rgba(110,168,255,.45);transform:translateY(-1px)}.choice.correct{border-color:rgba(74,222,128,.65);background:rgba(74,222,128,.10)}.choice.wrong{border-color:rgba(251,113,133,.65);background:rgba(251,113,133,.10)}.feedback{margin-top:24px;border-top:1px solid var(--line);padding-top:20px}.feedback strong{display:block;font-size:16px;margin-bottom:12px}.feedback.correct strong{color:var(--good)}.feedback.wrong strong{color:var(--bad)}.feedback p{margin:7px 0;color:var(--muted);line-height:1.5}.feedback .preferred{border:1px solid rgba(110,168,255,.28);background:rgba(110,168,255,.07);border-radius:14px;padding:12px 13px;color:var(--text)}.after-answer{margin-top:16px;justify-content:flex-end}
.results-card{max-width:820px;margin:auto;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(155deg,rgba(18,34,59,.96),rgba(12,23,42,.98));box-shadow:var(--shadow);padding:clamp(26px,5vw,44px)}.score-ring{width:auto;height:auto;border:0;border-radius:0;display:flex;align-items:baseline;gap:12px;text-align:left;background:none}.score-ring strong{font-size:clamp(42px,8vw,72px);font-weight:900;letter-spacing:-.06em}.score-ring span{color:var(--accent);font-size:18px;font-weight:850;margin:0}.results-card>p:not(.kicker){color:var(--muted);line-height:1.6}.missed-list{display:grid;gap:9px;margin:28px 0;max-height:360px;overflow:auto}.missed-item{border:1px solid var(--line);border-radius:13px;padding:12px 13px;background:rgba(255,255,255,.025)}.missed-item strong{display:block;margin-bottom:6px}.missed-item p{margin:4px 0;color:var(--muted);line-height:1.45}.missed-item .preferred{color:var(--text)}
.footer{min-height:82px;display:flex;justify-content:space-between;align-items:center;color:var(--muted);font:700 10px var(--mono);letter-spacing:.08em;text-transform:uppercase}.footer a{color:inherit;text-decoration:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:860px){.topbar{height:68px}.intro{display:grid;align-items:start}.mode-tabs{width:100%;min-width:0}.study-layout{grid-template-columns:1fr;max-width:680px;margin:auto}.study-controls{position:static}.answer-methods{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.shell,.topbar{width:min(100% - 28px,1060px)}.brand::before{width:38px;height:38px;border-radius:12px}.intro>div:first-child{display:none}.intro{padding:5px 0 14px}.mode-tab{font-size:11px;padding:8px 5px}.view{padding:8px 0 34px}.card-stack::before,.card-stack::after{display:block}.flashcard{min-height:380px;padding:28px 22px 24px}.card-face h2{font-size:clamp(25px,7vw,34px)}.card-answer p:last-child{font-size:clamp(27px,7.5vw,38px)}.study-controls{padding:14px}.primary-controls{display:grid;grid-template-columns:1fr 1.2fr 1fr}.primary-controls button{padding:10px 6px;font-size:11px}.flag-controls{display:grid;grid-template-columns:1fr 1fr 1fr}.flag-controls button{padding:9px 5px;font-size:10px}.jump-row{display:grid;grid-template-columns:auto 70px auto 1fr}.shortcut-hint{display:none}.answer-methods{grid-template-columns:1fr}.test-setup,.test-card,.results-card{padding:24px 20px;min-height:auto}.typed-form{grid-template-columns:1fr}.typed-form .primary{width:100%}.after-answer{display:grid;grid-template-columns:1fr}.after-answer button{width:100%}.footer{padding:24px 0;align-items:flex-start;gap:10px;flex-direction:column}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}