:root{--ink:#25242a;--muted:#6d6068;--purple:#8f1d2c;--purple-dark:#6f1421;--purple-soft:#f7e9ec;--line:#e4d5d8;--paper:#fff;--bg:#fcf8f3;--green:#2f6b57;--green-soft:#e7f3ee;--red:#8f1d2c;--red-soft:#fff0f2;--blue:#5c2a55;--teal:#2f6b57;--orange:#9b651b;--shadow:0 18px 55px rgba(91,31,44,.11);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:300px;background:radial-gradient(circle at 80% 0,#f7e9ec 0,transparent 26%),var(--bg);line-height:1.55}.wrap{width:min(1120px,calc(100% - 40px));margin-inline:auto}.skip{position:fixed;left:10px;top:-60px;z-index:99;background:#fff;padding:12px;border-radius:10px;color:var(--purple)}.skip:focus{top:10px}.topbar{height:76px;border-bottom:1px solid rgba(143,29,44,.1);display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100% - 1120px)/2));background:rgba(251,249,254,.84);backdrop-filter:blur(14px);position:relative;z-index:3}.brand{display:flex;align-items:center;gap:11px;font-weight:850;color:var(--ink);text-decoration:none;letter-spacing:-.02em}.brand-mark{width:37px;height:37px;border-radius:12px;background:linear-gradient(145deg,#ad3344,#761523);display:grid;place-items:center;color:#fff;font-size:18px;box-shadow:0 7px 20px rgba(143,29,44,.25)}.privacy-pill{font-size:.82rem;color:var(--green);background:var(--green-soft);border:1px solid #c4eadc;border-radius:999px;padding:8px 12px}.privacy-pill span{font-size:.55rem;vertical-align:2px}.hero{display:grid;grid-template-columns:1.25fr .75fr;align-items:center;gap:40px;min-height:470px;padding-block:60px}.eyebrow,.section-kicker{color:var(--purple);font-weight:850;text-transform:uppercase;letter-spacing:.11em;font-size:.75rem;margin:0 0 12px}.hero h1{font-size:clamp(3rem,6vw,5.5rem);line-height:.97;letter-spacing:-.065em;margin:0;max-width:760px}.lede{font-size:1.18rem;color:var(--muted);max-width:600px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0}.button{appearance:none;border:0;border-radius:13px;padding:13px 18px;font:inherit;font-weight:800;cursor:pointer;transition:.2s transform,.2s box-shadow,.2s background}.button:hover{transform:translateY(-2px)}.button:focus-visible,.icon-button:focus-visible,.study-nav button:focus-visible,.chip:focus-visible,.flashcard:focus-visible,.text-button:focus-visible{outline:3px solid #e6b761;outline-offset:3px}.primary{background:var(--purple);color:#fff;box-shadow:0 9px 24px rgba(143,29,44,.25)}.primary:hover{background:var(--purple-dark)}.quiet{background:var(--purple-soft);color:var(--purple-dark)}.dark{background:var(--ink);color:#fff}.wide{width:100%}.button:disabled{opacity:.45;cursor:not-allowed;transform:none}.source-note{display:flex;gap:10px;color:var(--muted);font-size:.88rem;max-width:600px}.source-note>span:first-child{display:grid;place-items:center;min-width:23px;height:23px;border-radius:50%;background:var(--green-soft);color:var(--green);font-weight:900}.hero-art{display:grid;place-items:center}.orbit{width:min(330px,80vw);aspect-ratio:1;border:2px dashed #ddb9c0;border-radius:50%;position:relative;animation:float 5s ease-in-out infinite}.cycle-core{position:absolute;inset:20%;border-radius:50%;display:grid;place-content:center;text-align:center;color:#fff;background:linear-gradient(150deg,#a62e40,#6f1421);box-shadow:0 25px 70px rgba(111,20,33,.28)}.cycle-core strong{font-size:1.5rem}.cycle-core span{opacity:.78}.orb{position:absolute;background:#fff;padding:10px 14px;border:1px solid var(--line);border-radius:999px;box-shadow:var(--shadow);font-size:.82rem;font-weight:800}.orb.one{left:-5%;top:17%;color:var(--blue)}.orb.two{right:-3%;top:37%;color:var(--teal)}.orb.three{left:20%;bottom:-3%;color:var(--orange)}@keyframes float{50%{transform:translateY(-8px)}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.orbit{animation:none}.button{transition:none}}.progress-wrap{border-radius:24px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:25px 28px;display:grid;grid-template-columns:1.1fr 1.6fr auto;gap:22px;align-items:center;margin-bottom:38px}.progress-wrap h2{font-size:1.25rem;margin:0}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stats div{padding-left:20px;border-left:1px solid var(--line)}.stats strong{display:block;font-size:1.4rem}.stats span{display:block;color:var(--muted);font-size:.78rem}.text-button{border:0;background:none;color:var(--muted);text-decoration:underline;cursor:pointer}.study-nav{position:sticky;top:0;z-index:5;background:rgba(251,249,254,.93);backdrop-filter:blur(16px);border-block:1px solid var(--line)}.nav-scroll{display:flex;overflow:auto;scrollbar-width:none}.study-nav button{white-space:nowrap;border:0;background:none;padding:17px 20px;font:inherit;font-weight:750;color:var(--muted);cursor:pointer;border-bottom:3px solid transparent}.study-nav button.active{color:var(--purple);border-bottom-color:var(--purple)}.study-nav button span{background:#f1e4e7;border-radius:99px;padding:2px 7px;font-size:.72rem}.content-shell{padding-block:55px 90px;min-height:760px}.tab-panel{display:none}.tab-panel.active{display:block}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:30px}.section-head h2{font-size:clamp(2rem,4vw,3rem);letter-spacing:-.045em;line-height:1;margin:0}.section-head>p{color:var(--muted);max-width:420px;margin:0}.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.guide-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:25px;position:relative;overflow:hidden}.guide-card:before{content:"";position:absolute;inset:0 auto 0 0;width:5px;background:var(--purple)}.guide-card.blue:before{background:var(--blue)}.guide-card.teal:before{background:var(--teal)}.guide-card.orange:before{background:var(--orange)}.guide-card h3{margin:0 0 15px}.guide-card ul{margin:0;padding-left:20px;color:var(--muted)}.guide-card li+li{margin-top:10px}.exam-tip{margin-top:18px;display:flex;gap:16px;border-radius:18px;padding:22px;background:#fff8e8;border:1px solid #f1ddb0;color:#614810}.exam-tip p{margin:4px 0 0}.tip-icon{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:#f4b83c;font-weight:900}.card-tools{display:flex;gap:8px;margin-bottom:20px}.chip{border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:999px;padding:8px 13px;font:inherit;font-size:.86rem;font-weight:750;cursor:pointer}.chip.active{border-color:var(--purple);background:var(--purple-soft);color:var(--purple)}.flash-stage{display:grid;justify-items:center}.card-progress{color:var(--muted);font-size:.88rem}.flashcard{width:min(700px,100%);height:380px;border:0;background:transparent;perspective:1200px;position:relative;cursor:pointer;color:inherit}.card-face{position:absolute;inset:0;border-radius:26px;padding:45px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;backface-visibility:hidden;transition:transform .48s cubic-bezier(.2,.8,.2,1);box-shadow:var(--shadow);border:1px solid var(--line)}.card-face.front{background:linear-gradient(150deg,#fff,#fdf1f3)}.card-face.back{background:linear-gradient(150deg,#9d2b3b,#661824);color:#fff;transform:rotateY(180deg)}.flashcard.flipped .front{transform:rotateY(-180deg)}.flashcard.flipped .back{transform:rotateY(0)}.card-face small{font-weight:900;letter-spacing:.14em;color:var(--purple);margin-bottom:28px}.card-face.back small{color:#f0dce0}.card-face strong{font-size:clamp(1.5rem,4vw,2.35rem);line-height:1.25}.flip-hint{position:absolute;bottom:24px;font-size:.82rem;color:var(--muted)}.back .flip-hint{color:#d9c6fa}.card-controls{display:flex;align-items:center;gap:14px;margin-top:22px}.icon-button{border:1px solid var(--line);background:#fff;border-radius:13px;width:48px;height:48px;font-size:1.25rem;cursor:pointer}.quiz-setup{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:780px;margin:auto}.setup-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.setup-card label{display:block;font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;font-weight:850;color:var(--purple);margin-bottom:7px}.setup-card select{width:100%;border:0;background:transparent;font:inherit;color:var(--ink);font-weight:750}.quiz-setup>.wide{grid-column:1/-1}.quiz-live{max-width:780px;margin:auto}.quiz-status{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;margin-bottom:16px;color:var(--muted);font-weight:750}.mini-progress{height:8px;border-radius:99px;background:#efe3e5;overflow:hidden}.mini-progress i{display:block;height:100%;width:0;background:var(--purple);transition:width .25s}.question-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:clamp(22px,5vw,42px);box-shadow:var(--shadow)}.question-card h3{font-size:clamp(1.35rem,3vw,1.8rem);line-height:1.3;margin-top:0}.options{display:grid;gap:10px;margin:25px 0}.option{border:1px solid var(--line);background:#fff;border-radius:14px;padding:15px;text-align:left;font:inherit;color:var(--ink);cursor:pointer;display:flex;gap:12px;align-items:flex-start}.option span{display:grid;place-items:center;min-width:27px;height:27px;border-radius:8px;background:#f1edf5;font-weight:850;font-size:.82rem}.option:hover:not(:disabled){border-color:#c9828c;background:#fffafb}.option.selected{border:2px solid var(--purple);background:var(--purple-soft)}.option.correct{border-color:#66ad94;background:var(--green-soft)}.option.incorrect{border-color:#dc8496;background:var(--red-soft)}.option:disabled{color:inherit}.feedback{border-radius:15px;padding:16px;margin:14px 0}.feedback.correct{background:var(--green-soft);color:#125a43}.feedback.incorrect{background:var(--red-soft);color:#8c2338}.feedback strong{display:block}.result{max-width:780px;margin:auto;background:#fff;border:1px solid var(--line);border-radius:26px;padding:40px;text-align:center;box-shadow:var(--shadow)}.score-ring{width:150px;height:150px;border-radius:50%;display:grid;place-content:center;margin:10px auto 25px;background:conic-gradient(var(--purple) var(--score),#efe3e5 0);position:relative}.score-ring:before{content:"";position:absolute;inset:12px;background:#fff;border-radius:50%}.score-ring strong,.score-ring span{position:relative}.score-ring strong{font-size:2.3rem}.score-ring span{color:var(--muted);font-size:.8rem}.result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:22px}.missed-list{display:grid;gap:14px}.missed-item{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.missed-item h3{font-size:1.08rem;margin-top:0}.missed-item .options{grid-template-columns:repeat(2,1fr);margin-bottom:0}.empty{background:#fff;border:1px dashed #d8b8be;border-radius:22px;text-align:center;padding:55px 20px;color:var(--muted)}.empty strong{display:block;color:var(--ink);font-size:1.25rem}.print-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.print-grid article{background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px}.print-grid p{color:var(--muted)}.print-icon{width:48px;height:48px;border-radius:14px;background:var(--purple-soft);color:var(--purple);display:grid;place-items:center;font-weight:900}.print-icon.key{background:var(--green-soft);color:var(--green)}footer{border-top:1px solid var(--line);background:#fff;padding:35px 0;color:var(--muted);font-size:.86rem}footer .wrap{display:flex;justify-content:space-between;gap:25px}footer p{margin:4px 0}footer strong{color:var(--ink)}#print-sheet{display:none}@media(max-width:780px){.hero{grid-template-columns:1fr;padding-block:45px}.hero-art{display:none}.progress-wrap{grid-template-columns:1fr}.stats div:first-child{padding-left:0;border-left:0}.section-head{display:block}.section-head>p{margin-top:12px}.guide-grid,.print-grid{grid-template-columns:1fr}.missed-item .options{grid-template-columns:1fr}.topbar{height:66px}.privacy-pill{font-size:0;width:35px;height:35px;padding:0;display:grid;place-items:center}.privacy-pill span{font-size:.6rem}.study-nav{top:0}.content-shell{padding-top:40px}}@media(max-width:520px){.wrap{width:min(100% - 28px,1120px)}.hero h1{font-size:3.2rem}.progress-wrap{padding:22px}.stats{gap:3px}.stats div{padding-left:10px}.flashcard{height:410px}.card-face{padding:34px 22px}.quiz-setup{grid-template-columns:1fr}.quiz-setup>.wide{grid-column:auto}.quiz-status{grid-template-columns:auto auto}.mini-progress{grid-column:1/-1;grid-row:2}footer .wrap{display:block}}@media print{body{background:#fff;font-family:Arial,sans-serif}.topbar,main,footer{display:none!important}#print-sheet{display:block!important;color:#111;font-size:10.5pt}#print-sheet h1{font-size:22pt;margin-bottom:4px}#print-sheet .print-meta{display:flex;justify-content:space-between;border-bottom:1px solid #111;padding-bottom:10px;margin-bottom:18px}#print-sheet .print-question{break-inside:avoid;margin:0 0 15px}#print-sheet .print-question h3{font-size:11pt;margin:0 0 5px}#print-sheet ol{margin:0;padding-left:30px}#print-sheet .key-answer{font-weight:bold}#print-sheet .explanation{margin:4px 0;color:#333}.print-page-break{break-before:page}}