@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-ext-wght-normal-DjL33-gN.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-wght-normal-BEAKL7Jp.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-vietnamese-wght-normal-6IgcOCM7.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 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900;src:url(/assets/geist-latin-wght-normal-BgDaEnEv.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--color-bg:#f4f5f2;--color-surface:#fff;--color-surface-muted:#ecefeb;--color-surface-sunken:#f7f8f5;--color-ink:#171a1f;--color-ink-hover:#2b3038;--color-ink-secondary:#575d65;--color-ink-muted:#6e747c;--color-border:#d9ddd8;--color-border-strong:#b9bfb8;--color-accent:#b8f34a;--color-accent-hover:#a4df34;--color-accent-ink:#131a0e;--color-accent-soft:#eefbd6;--color-secondary:#4f46e5;--color-secondary-soft:#eef0ff;--color-success:#1d7148;--color-success-soft:#e5f3eb;--color-warning:#8a5a00;--color-warning-soft:#fff4d9;--color-danger:#b42318;--color-danger-hover:#93190f;--color-danger-soft:#fef0ee;--color-focus:#4338ca;--color-overlay:#171a1f7a;--color-placeholder:#767b82;--color-on-ink:#c9ced4;--color-on-ink-muted:#b3b9c0;--color-success-border:#bfe0cd;--color-danger-border:#f0bdb6;--color-danger-strong:#6e2a22;--color-accent-glow:#b8f34a47;--color-focus-glow:#4338ca2e;--radius-control:12px;--radius-card:16px;--radius-panel:18px;--radius-pill:999px;--shadow-overlay:0 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h2{font-size:clamp(1.8rem,5vw,2.6rem);font-weight:var(--weight-bold);letter-spacing:-.035em;line-height:1.08}.empty-state p{max-width:520px;color:var(--color-ink-secondary)}.empty-state .button{margin-top:8px}.loading{margin:clamp(40px, 7vh, 80px) var(--gutter);border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);color:var(--color-ink-secondary);align-items:center;gap:12px;padding:28px;display:flex}.loading span{border:2px solid var(--color-border);border-top-color:var(--color-ink);border-radius:50%;width:18px;height:18px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.import-layout{grid-template-columns:1fr;align-items:start;gap:24px;display:grid}.import-card,.format-card{border:1px solid 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h2{overflow-wrap:anywhere;max-width:100%;font-size:1.4rem;font-weight:var(--weight-bold);letter-spacing:-.03em;line-height:1.15}.drop-zone p{color:var(--color-ink-muted);margin-top:6px;font-size:.92rem}.inline-error,.toast{border:1px solid var(--color-danger-border);border-left:3px solid var(--color-danger);background:var(--color-danger-soft);color:var(--color-danger);border-radius:10px;align-items:center;gap:8px;padding:10px 14px;font-size:.88rem;display:flex}.inline-error{margin-top:16px}.format-icon{border:1px solid var(--color-border);background:var(--color-surface-muted);border-radius:14px;place-items:center;width:48px;height:48px;margin-bottom:22px;display:grid}.format-icon svg{stroke-width:1.75px;width:22px;height:22px}.format-card h2{font-size:1.4rem;font-weight:var(--weight-bold);letter-spacing:-.03em;margin-top:10px;line-height:1.15}.format-card>p{color:var(--color-ink-muted);margin-top:10px;font-size:.92rem}.format-card pre{border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-surface);color:var(--color-ink-secondary);margin:18px 0;padding:16px;font:.78rem/1.7 ui-monospace,SF Mono,Menlo,monospace;overflow-x:auto}.example-links{flex-wrap:wrap;gap:4px 18px;display:flex}.text-link{min-height:var(--touch-target);color:var(--color-focus);font-size:.86rem;font-weight:var(--weight-semibold);align-items:center;gap:4px;text-decoration:none;display:inline-flex}.text-link:hover{text-decoration:underline}.back-link{min-height:var(--touch-target);color:var(--color-ink-secondary);font-size:.86rem;font-weight:var(--weight-semibold);cursor:pointer;background:0 0;border:0;border-radius:10px;align-items:center;gap:6px;margin:0 0 20px -6px;padding:0 10px 0 6px;transition:background .15s,color .15s;display:inline-flex}.back-link:hover{background:var(--color-surface-muted);color:var(--color-ink)}.study-header{flex-wrap:wrap;justify-content:space-between;align-items:end;gap:16px 24px;display:flex}.study-header h1{margin-top:10px;font-size:clamp(2rem,4.2vw,3rem)}.set-description{max-width:680px;color:var(--color-ink-secondary);margin-top:14px}.breadcrumb{color:var(--color-ink-secondary);font-size:.72rem;font-weight:var(--weight-semibold);letter-spacing:.14em;text-transform:uppercase}.breadcrumb i{color:var(--color-ink-muted);padding:0 6px;font-style:normal}.mode-chip{border:1px solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-surface);min-height:25px;font-size:.75rem;font-weight:var(--weight-semibold);align-items:center;gap:6px;padding:3px 10px;display:inline-flex}.mode-chip svg{width:14px;height:14px}.progress-meta{color:var(--color-ink-muted);font-variant-numeric:tabular-nums;justify-content:space-between;margin-top:32px;font-size:.8rem;display:flex}.progress-track{border-radius:var(--radius-pill);background:var(--color-surface-muted);height:9px;margin:8px 0 28px;overflow:hidden}.progress-track i{border-radius:var(--radius-pill);background:var(--color-accent-hover);height:100%;transition:width .35s;display:block}.card-overview-page{max-width:calc(1060px + 2 * var(--gutter))}.status-note,.resume-card{border:1px solid var(--color-border);border-left:3px solid var(--color-accent-hover);border-radius:var(--radius-card);background:var(--color-surface);margin-top:24px;padding:16px 18px}.progress-overview{gap:20px;margin-top:34px;display:grid}.progress-score{border-radius:var(--radius-panel);background:var(--color-ink);color:var(--color-surface);grid-template-columns:auto 1fr;align-items:end;gap:4px 24px;padding:clamp(24px,4vw,38px);display:grid}.progress-score .overline{color:var(--color-on-ink);grid-column:1/-1}.progress-score strong{color:var(--color-accent);font-variant-numeric:tabular-nums;letter-spacing:-.06em;grid-row:2/4;font-size:clamp(3.2rem,8vw,5.4rem);line-height:.9}.progress-score p{max-width:480px;color:var(--color-on-ink);align-self:start}.progress-score progress{align-self:end;height:9px}.box-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;display:grid}.box-card{border:1px solid var(--color-border);border-top:4px solid var(--box-color,var(--color-border-strong));border-radius:var(--radius-card);background:var(--color-surface);align-content:space-between;gap:6px;min-height:145px;padding:16px;display:grid}.box-card span{font-size:.78rem;font-weight:var(--weight-semibold)}.box-card strong{font-variant-numeric:tabular-nums;font-size:2rem;line-height:1}.box-card small{color:var(--color-ink-muted);line-height:1.35}.box-1{--box-color:#8b9198}.box-2{--box-color:#8a5a00}.box-3{--box-color:#4f46e5}.box-4{--box-color:#1d7148}.box-5{--box-color:var(--color-accent-hover)}.progress-stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0;display:grid}.progress-stats div{border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-surface);padding:14px 16px}.progress-stats dt{color:var(--color-ink-muted);font-size:.76rem}.progress-stats dd{font-variant-numeric:tabular-nums;font-size:1.05rem;font-weight:var(--weight-semibold);margin:5px 0 0}.card-empty{margin-top:34px}.resume-card{background:var(--color-accent-soft);justify-content:space-between;align-items:center;gap:20px;display:flex}.resume-card div{gap:4px;display:grid}.resume-card .overline{color:var(--color-ink-secondary)}.resume-card strong{font-size:1.12rem}.resume-card p{color:var(--color-ink-secondary)}.session-launcher{border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);gap:24px;margin-top:20px;padding:clamp(22px,4vw,36px);display:grid}.session-launcher h2{letter-spacing:-.025em;margin-top:8px;font-size:1.55rem}.session-launcher fieldset{border:0;min-width:0;margin:0;padding:0}.session-launcher legend{font-size:.82rem;font-weight:var(--weight-semibold);margin-bottom:9px}.choice-grid,.size-choices,.box-choices{gap:8px;display:grid}.choice-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.size-choices{grid-template-columns:repeat(3,minmax(0,1fr))}.box-choices{grid-template-columns:repeat(5,minmax(0,1fr))}.choice{min-height:var(--touch-target);border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-surface);font-weight:var(--weight-medium);cursor:pointer;place-content:center;gap:2px;padding:9px 12px;display:grid}.choice:hover{border-color:var(--color-border-strong)}.choice.active{border-color:var(--color-ink);background:var(--color-ink);color:var(--color-surface);box-shadow:0 0 0 2px var(--color-focus-glow)}.choice small{color:inherit;opacity:.75;font-size:.72rem}.inline-hint{border-radius:var(--radius-control);background:var(--color-warning-soft);color:var(--color-warning);padding:12px 14px}.launcher-submit{justify-self:end}.overview-skeleton{gap:12px;margin-top:34px;display:grid}.overview-skeleton i{border-radius:var(--radius-card);background:var(--color-surface-muted);height:100px;overflow:hidden}.overview-skeleton i:first-child{height:180px}.error-state{border:1px solid var(--color-danger-border);border-radius:var(--radius-panel);background:var(--color-danger-soft);justify-items:start;gap:12px;margin-top:34px;padding:28px;display:grid}.error-state p{color:var(--color-danger-strong)}.session-header{justify-content:space-between;align-items:end;gap:16px;display:flex}.session-header h1{margin-top:8px;font-size:clamp(1.8rem,4vw,2.5rem)}.session-progress{height:9px;margin:8px 0 28px;display:block}.grade-panel:focus{outline:none}.sending-state{color:var(--color-ink-secondary);text-align:center;margin-top:10px}.review-feedback{border-radius:var(--radius-control);border:1px solid;align-items:center;gap:12px;padding:16px;display:flex}.review-feedback.correct{border-color:var(--color-success-border);background:var(--color-success-soft);color:var(--color-success)}.review-feedback.wrong{border-color:var(--color-danger-border);background:var(--color-danger-soft);color:var(--color-danger)}.review-feedback div{gap:2px;display:grid}.review-feedback strong{font-weight:var(--weight-semibold)}.last-review{margin:-12px 0 16px}.last-review .review-feedback{padding:10px 14px;animation:.2s last-review-in}@keyframes last-review-in{0%{opacity:0;transform:translateY(-4px)}}@media (prefers-reduced-motion:reduce){.last-review .review-feedback{animation:none}}.completion-page{place-items:center;min-height:100vh;padding-block:40px;display:grid}.completion-card{border-radius:var(--radius-panel);background:var(--color-ink);width:min(720px,100%);color:var(--color-surface);text-align:center;padding:clamp(28px,6vw,56px)}.completion-icon{background:var(--color-accent);width:64px;height:64px;color:var(--color-accent-ink);border-radius:50%;place-items:center;margin:0 auto 24px;display:grid}.completion-card .eyebrow{color:var(--color-on-ink)}.completion-card h1{font-size:clamp(2rem,6vw,3.5rem);line-height:1.05}.completion-card>p{max-width:540px;color:var(--color-on-ink);margin:16px auto 28px}.completion-boxes{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}.completion-boxes span{color:var(--color-on-ink);border:1px solid #ffffff2e;border-radius:10px;gap:5px;padding:10px 5px;font-size:.72rem;display:grid}.completion-boxes b{color:var(--color-surface);font-size:1.15rem}.completion-actions{justify-content:center;gap:8px;margin-top:28px;display:flex}.completion-card .button--secondary{color:var(--color-surface);background:0 0;border-color:#ffffff3d}.completion-card .button--secondary:hover{background:#ffffff1a}.flashcard{border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);flex-direction:column;justify-content:center;gap:24px;width:100%;min-height:365px;padding:clamp(20px,4vw,40px);transition:background .15s,border-color .15s;display:flex}.flashcard:hover{border-color:var(--color-ink-muted)}.flashcard.flipped{--color-ink-muted:var(--color-ink-secondary);background:var(--color-surface-sunken)}.flashcard-main{width:100%;color:inherit;cursor:pointer;background:0 0;border:0;flex-direction:column;align-items:center;gap:20px;padding:8px;display:flex}.flashcard strong{max-width:640px;font-size:clamp(1.5rem,4vw,2.2rem);font-weight:var(--weight-bold);letter-spacing:-.03em;text-align:center;line-height:1.25}.flashcard small{color:var(--color-ink-muted);font-size:.82rem}.card-explanation{border-left:3px solid var(--color-accent);max-width:660px;color:var(--color-ink-secondary);text-align:left;padding-left:14px}.study-actions{justify-content:flex-end;gap:8px;margin-top:16px;display:flex}.card-grade-actions{justify-content:space-between}.question-card{border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);padding:clamp(20px,4vw,40px)}.question-card h2{max-width:700px;font-size:clamp(1.5rem,3vw,2rem);font-weight:var(--weight-bold);letter-spacing:-.03em;margin:12px 0 28px;line-height:1.2}.answer-field{gap:8px;display:grid}.answer-field span{font-size:.88rem;font-weight:var(--weight-medium)}.answer-field input{border:1px solid 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h1{margin-top:8px;font-size:clamp(2.2rem,6vw,3.6rem)}.test-result-hero>strong{color:var(--color-accent);margin-top:8px;font-size:2rem;display:block}.test-result-hero>p{color:var(--color-on-ink);margin:12px 0 26px}.test-result-hero>div{justify-content:center;gap:8px;display:flex}.test-result-hero .button--secondary{color:var(--color-surface);background:0 0;border-color:#ffffff3d}.mistake-list{margin-top:30px}.mistake-card{border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);margin-top:12px;padding:clamp(18px,4vw,28px)}.mistake-card h3{margin-top:8px;font-size:1.15rem}.mistake-card dl{grid-template-columns:1fr 1fr;gap:10px;margin:18px 0 0;display:grid}.mistake-card dl div{border-radius:var(--radius-control);background:var(--color-surface-sunken);padding:12px}.mistake-card dt{color:var(--color-ink-muted);font-size:.74rem}.mistake-card dd{font-weight:var(--weight-semibold);margin:4px 0 0}.mistake-card>p{border-left:3px solid 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figcaption{color:var(--color-ink-muted);margin-top:6px;font-size:.78rem;line-height:1.45}.lightbox{z-index:100;background:var(--color-overlay);place-items:center;padding:24px;display:grid;position:fixed;inset:0}.lightbox-dialog{border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);width:min(1180px,100%);max-height:100%;box-shadow:var(--shadow-overlay);gap:12px;padding:72px 54px 18px;display:grid;position:relative}.lightbox-close{position:absolute;top:18px;right:18px}.lightbox-image-wrap{grid-template-columns:44px minmax(0,1fr) 44px;align-items:center;gap:12px;min-height:0;display:grid}.lightbox-image-wrap>img{border-radius:var(--radius-control);object-fit:contain;grid-column:2;justify-self:center;max-width:100%;max-height:calc(100vh - 220px)}.lightbox-nav.previous{grid-column:1}.lightbox-nav.next{grid-column:3}.lightbox-dialog p{color:var(--color-ink);text-align:center;justify-content:center;gap:16px;font-size:.86rem;display:flex}.lightbox-dialog p span{color:var(--color-ink-muted);font-variant-numeric:tabular-nums}.results-page{place-items:center;min-height:100vh;padding-block:40px;display:grid}.results-card{--color-ink-muted:var(--color-on-ink-muted);border-radius:var(--radius-panel);background:var(--color-ink);width:min(580px,100%);color:var(--color-surface);text-align:center;padding:clamp(28px,6vw,56px)}.results-card .eyebrow{color:var(--color-on-ink);align-items:center;gap:8px;display:inline-flex}.results-card .eyebrow:before{background:var(--color-accent);content:"";border-radius:50%;width:8px;height:8px}.result-ring{background:conic-gradient(var(--color-accent) var(--score), #ffffff24 0);border-radius:50%;place-items:center;width:132px;height:132px;margin:0 auto 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button{width:32px;height:32px;color:inherit;cursor:pointer;background:0 0;border:0;border-radius:8px;place-items:center;margin-left:auto;display:grid}.toast button:hover{background:var(--color-surface)}@media (width>=761px){.page-heading h1{white-space:nowrap}}@media (width>=760px){.assessment-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width>=980px){.import-layout{grid-template-columns:minmax(0,1.45fr) minmax(300px,.75fr)}.format-card{position:sticky;top:30px}}@media (width<=900px){.stats-row{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=760px){.app-shell{--sidebar-width:0px;padding-top:64px}.app-content{margin-left:0}.mobile-topbar{z-index:35;border-bottom:1px solid var(--color-border);background:var(--color-surface-sunken);align-items:center;gap:12px;height:64px;padding:10px 16px;display:flex;position:fixed;inset:0 0 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