:root{--bg:#f8fafc;--surface:#fff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;--accent:#4f46e5;--accent-soft:#eef2ff;--danger:#b91c1c;--success:#047857;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--text)}body{margin:0;min-height:100vh}a{color:var(--accent);text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;padding-bottom:82px}.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;max-width:760px;margin:0 auto;padding:0 18px}.brand{color:var(--text);display:flex;gap:10px;align-items:center;font-weight:800}.brand-mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:#fff;background:var(--text)}.content{max-width:760px;margin:0 auto;padding:14px 18px 32px}.hero{display:flex;gap:20px;align-items:flex-end;justify-content:space-between;margin:14px 0 22px}.hero.compact{align-items:flex-start}h1{font-size:clamp(1.8rem,7vw,2.7rem);line-height:1.05;margin:4px 0 8px;letter-spacing:-.04em}h2{font-size:1.2rem;margin:0}h3{margin:6px 0 4px}p{line-height:1.45}.eyebrow{text-transform:uppercase;letter-spacing:.1em;font-size:.72rem;font-weight:800;color:var(--accent);margin:0}.muted{color:var(--muted)}.fineprint{color:var(--muted);font-size:.82rem}.center{text-align:center}.auth-card{max-width:430px;margin:7vh auto 0;background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:0 18px 45px rgba(15,23,42,.06)}.stack{display:grid;gap:16px}.stack.tight{gap:9px}label{display:grid;gap:7px;font-size:.88rem;font-weight:700}input,select{width:100%;min-height:48px;border-radius:13px;border:1px solid #cbd5e1;background:#fff;padding:10px 13px;color:var(--text);outline:none}input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.check{display:flex;align-items:center;gap:8px;font-weight:500}.check input{width:auto;min-height:auto}.button{border:0;border-radius:14px;min-height:48px;padding:12px 17px;display:inline-flex;justify-content:center;align-items:center;font-weight:800}.button.primary{background:var(--accent);color:#fff}.button.secondary{background:#fff;border:1px solid var(--line);color:var(--text)}.button.full{width:100%}.link-button{border:0;background:transparent;color:var(--accent);padding:7px;font-weight:700}.link-button.danger{color:var(--danger)}.notice{border-radius:16px;padding:14px 16px;margin:0 0 15px;font-size:.9rem}.notice ul{margin:7px 0 0;padding-left:20px}.notice.success{background:#ecfdf5;color:#065f46}.notice.error{background:#fef2f2;color:#991b1b}.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:28px}.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;display:grid;gap:2px}.stat strong{font-size:1.55rem}.stat span{color:var(--muted);font-size:.82rem}.section{margin-top:28px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.set-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;margin-bottom:10px;color:var(--text);display:flex;justify-content:space-between;align-items:center}.set-card p{margin:0;color:var(--muted);font-size:.85rem}.chevron{font-size:2rem;color:#94a3b8}.pill{display:inline-flex;padding:4px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:.72rem;font-weight:800}.empty{text-align:center;padding:34px 20px;border:1px dashed #cbd5e1;border-radius:20px;background:rgba(255,255,255,.55)}.bottom-nav{position:fixed;left:50%;bottom:10px;transform:translateX(-50%);width:min(calc(100% - 24px),600px);height:60px;padding:6px;display:grid;grid-template-columns:repeat(3,1fr);background:rgba(15,23,42,.94);backdrop-filter:blur(10px);border-radius:19px;z-index:20;box-shadow:0 10px 35px rgba(15,23,42,.2)}.bottom-nav a{color:#cbd5e1;display:grid;place-items:center;border-radius:13px;font-size:.82rem;font-weight:800}.bottom-nav a.active{background:#fff;color:var(--text)}.inline-form{display:grid;grid-template-columns:1fr auto;gap:10px;margin-bottom:18px}.list{display:grid;gap:8px}.list-row{background:#fff;border:1px solid var(--line);border-radius:15px;padding:14px;display:flex;align-items:center;justify-content:space-between;gap:14px}.list-row>div{display:grid;gap:4px}.list-row span{color:var(--muted);font-size:.86rem}.vocab-list-row span{color:var(--text);font-size:1rem}.vocab-list-row strong{text-align:right}.two-cols{display:grid;grid-template-columns:1fr 1fr;gap:10px}.vocab-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.action-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.action-card{min-height:110px;padding:16px;border-radius:18px;border:1px solid var(--line);background:#fff;color:var(--text);display:flex;flex-direction:column;justify-content:flex-end}.action-card strong{font-size:1.05rem}.action-card span{color:var(--muted);font-size:.78rem;margin-top:3px}.primary-card{background:var(--text);color:#fff;border-color:var(--text)}.primary-card span{color:#cbd5e1}.form-card{padding:0}.form-card button{width:100%;height:100%;border:0;background:transparent;text-align:left;padding:16px;display:flex;flex-direction:column;justify-content:flex-end;color:var(--text)}.danger-zone{margin-top:32px;color:var(--muted);font-size:.85rem}.danger-zone form{margin-top:12px}.danger-button{background:#fee2e2;color:#991b1b}.upload-box{min-height:180px;border:2px dashed #cbd5e1;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:22px;background:#fff}.upload-box span{color:var(--muted);font-weight:400;margin-top:5px}.upload-box input{margin-top:16px;min-height:auto;border:0;padding:0}.review-list{display:grid;gap:10px}.review-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:12px;display:grid;gap:9px}.small-label{font-size:.72rem;color:var(--muted)}.flashcard-wrap{max-width:560px;margin:0 auto}.progress-line{display:grid;gap:7px;margin:8px 0 18px;color:var(--muted);font-size:.8rem}.progress-line>div{height:6px;background:#e2e8f0;border-radius:999px;overflow:hidden}.progress-line i{display:block;height:100%;background:var(--accent);border-radius:999px;transition:width .25s}.flashcard{min-height:330px;background:#fff;border:1px solid var(--line);border-radius:28px;display:grid;place-items:center;align-content:center;text-align:center;padding:28px;margin-bottom:12px;box-shadow:0 18px 48px rgba(15,23,42,.06)}.flashcard h2{font-size:2rem;margin:14px 0}.flashcard .answer{font-size:1.45rem;font-weight:800;color:var(--accent);border-top:1px solid var(--line);padding-top:20px;margin-top:16px;width:100%}.answer-actions{grid-template-columns:1fr 1fr;gap:10px}.answer-actions:not([hidden]){display:grid}.question-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:14px}.question-card span{font-size:1rem}.result-hero{text-align:center;margin:12px 0 24px}.result-hero>strong{display:block;font-size:1.3rem;margin-top:8px}.result-hero h1{font-size:3.2rem;margin:2px}.result-row{border-radius:16px;padding:14px;display:flex;justify-content:space-between;align-items:center;gap:12px}.result-row.correct{background:#ecfdf5}.result-row.wrong{background:#fef2f2}.result-row>div{display:grid;gap:4px}.result-row span,.result-row small{color:var(--muted);font-size:.82rem}.result-row b{font-size:1.4rem}.confidence-low{color:#b45309!important;font-weight:800}.button-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px}.paper-actions{display:flex;align-items:end;justify-content:space-between;gap:12px}.paper-sheet{background:#fff;max-width:210mm;min-height:260mm;margin:20px auto;padding:18mm;box-shadow:0 10px 35px rgba(15,23,42,.08)}.paper-sheet header{display:flex;justify-content:space-between;gap:20px;border-bottom:2px solid var(--text);padding-bottom:12px}.paper-code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:800}.paper-meta{margin:24px 0}.paper-questions{display:grid;gap:18px;padding-left:24px}.paper-questions li{padding-left:8px}.answer-line{margin-top:10px;height:25px;border-bottom:1px solid #94a3b8}@media(max-width:620px){.hero{align-items:stretch;flex-direction:column}.hero .button{width:100%}.action-grid{grid-template-columns:1fr}.action-card{min-height:85px}.vocab-row{grid-template-columns:1fr}.paper-sheet{padding:9mm;min-height:auto}}@media print{body{background:#fff}.no-print,.bottom-nav,.notice{display:none!important}.content{max-width:none;padding:0}.app-shell{padding:0}.paper-sheet{box-shadow:none;margin:0;padding:10mm 14mm;min-height:auto}}