:root{--ink:#20294d;--muted:#72809f;--purple:#6048e8;--bg:#f7f8fc;--navy:#20284e;--green:#19ab78;--red:#ea4265}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,Arial;color:var(--ink);background:var(--bg)}header{height:90px;background:#fff;border-bottom:1px solid #e7e9f1;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1440px)/2));gap:20px}.brand{display:flex;align-items:center;gap:14px;color:inherit;text-decoration:none}.brand b{display:grid;place-items:center;width:52px;height:52px;background:var(--purple);border-radius:17px;color:white;font-size:25px}.brand strong,.brand small{display:block}.brand small{color:var(--muted);margin-top:4px}main{max-width:1120px;margin:0 auto;padding:42px 24px}.eyebrow{color:var(--purple);font-size:14px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.hero{text-align:center}.hero h1{font-size:40px;margin:22px 0 12px}.sub{color:var(--muted);font-size:17px}.deckgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}.deck,.create,.learned{border-radius:28px;min-height:252px;padding:28px;background:#fff;border:1px solid #e2e5ef;cursor:pointer}.deck h2{margin:52px 0 8px;font-size:21px}.progress{height:6px;background:#e6e8ef;border-radius:9px;overflow:hidden;margin:23px 0 10px}.progress i{display:block;height:100%;background:var(--green)}.create{border:1px dashed #b9b0ff;text-align:center;color:var(--purple);padding-top:75px}.create b{font-size:38px}.create h2{font-size:20px}.learned{background:var(--navy);color:white}.learned h2{margin-top:94px}.btn{border:1px solid #dce1ec;background:#fff;border-radius:13px;padding:13px 17px;font-weight:750;color:#4d5b79;cursor:pointer;font-size:15px}.btn.primary{background:var(--purple);border-color:var(--purple);color:white}.btn.green{background:var(--green);color:#fff;border:0}.btn.red{color:var(--red);border-color:#ffc8d1}.actions{display:flex;gap:12px;flex-wrap:wrap}.studyhead{display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.studyhead h1{font-size:38px;margin:14px 0}.stat{background:var(--navy);color:#fff;padding:24px;border-radius:25px;min-width:230px}.stat b{display:block;font-size:33px;margin:14px 0}.study{display:grid;grid-template-columns:minmax(0,760px) 220px;justify-content:center;gap:24px;margin-top:28px}.card{min-height:320px;padding:30px;border-radius:28px;background:linear-gradient(135deg,#6148e9,#7744dd);color:#fff;cursor:pointer;box-shadow:0 18px 38px #c6c8da}.card.flipped{background:#fff;color:var(--ink)}.card h3{font-size:46px;margin-top:42px;margin-bottom:0;overflow-wrap:anywhere}.card .example{background:#f0efff;border-radius:14px;padding:15px;color:#5f6d8d;margin-top:20px;line-height:1.6}.side{display:grid;align-content:center;gap:14px}.nav{display:flex;justify-content:space-between;gap:12px;margin-top:18px}.nav .btn{min-width:165px}.exit{display:block;margin:0 auto}.rows{margin-top:30px}.row{background:#fff;border:1px solid #e2e5ef;border-radius:18px;padding:18px;margin:13px 0;display:flex;justify-content:space-between;align-items:center;gap:10px}.row b,.row small{display:block}.row small{color:var(--muted);margin-top:7px}dialog{position:relative;border:0;border-radius:26px;padding:30px;width:min(650px,calc(100vw - 32px));max-height:calc(100dvh - 28px);overflow:auto;box-shadow:0 30px 100px #15193666;color:var(--ink)}dialog::backdrop{background:#15193677}dialog h2{margin:0}.modalhead{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:22px}.close{position:absolute;top:18px;right:18px;border:0;background:#f1f2f7;border-radius:50%;width:36px;height:36px;font-size:24px;line-height:1;cursor:pointer;color:#4d5b79}input,textarea,select{width:100%;padding:14px;border:1px solid #dfe3ed;border-radius:12px;font:inherit;margin:6px 0 15px}label{font-size:14px;font-weight:750}.modalactions{display:flex;gap:12px;justify-content:flex-end;margin-top:10px}.toast{position:fixed;bottom:20px;right:20px;background:var(--navy);color:#fff;padding:14px 18px;border-radius:12px}@media(max-width:800px){header{height:auto;padding:18px 20px}.deckgrid,.study{grid-template-columns:1fr}.studyhead{display:block}.stat{margin-top:20px}.hero h1{font-size:32px}.card{min-height:280px}.card h3{font-size:38px}.actions{justify-content:center}.side{grid-template-columns:1fr 1fr}.exit{grid-column:span 2}main{padding:28px 18px}dialog{padding:24px 22px;width:calc(100vw - 18px)}}