:root{color:#17171a;font-synthesis:none;text-rendering:optimizelegibility;--flag-white:#fff;--flag-red:#dc143c;--flag-red-dark:#9f1239;--ink:#17171a;--muted:#5f6670;--line:#e4e6ea;--soft:#fafafa;background:#f7f7f8;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button{font:inherit;cursor:pointer;border:0}#app{min-height:100vh}.app-shell{background:linear-gradient(180deg, var(--flag-white) 0 50%, #fff4f6 50% 100%);grid-template-columns:320px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{background:linear-gradient(180deg, var(--flag-white) 0 48%, var(--flag-red) 48% 100%);color:var(--ink);border-right:1px solid #cfd3d8;flex-direction:column;gap:24px;padding:28px;display:flex}.brand-block{background:#ffffffe0;border:1px solid #17171a1f;border-radius:8px;padding:16px}.brand-block h1{color:var(--ink);margin:0;font-size:2.45rem;line-height:1}.brand-block p:last-child,.sidebar-note{color:#30343a}.eyebrow{color:var(--flag-red-dark);letter-spacing:0;text-transform:uppercase;margin:0 0 10px;font-size:.78rem;font-weight:800}.main-nav{gap:8px;display:grid}.main-nav button,.button-row button,.option-row button{background:var(--flag-white);color:var(--ink);text-align:left;border-radius:8px;padding:10px 12px;font-weight:750}.main-nav button{background:#ffffffe6;border:1px solid #17171a29}.main-nav button.active,.main-nav button:hover{background:var(--flag-red);color:var(--flag-white)}.sidebar-note{background:#ffffffe6;border:1px solid #17171a1f;border-radius:8px;margin-top:auto;padding:16px;font-size:.95rem}.sidebar-note small{color:#6b303c;margin-top:12px;display:block}.content{padding:28px}.view-stack,.content>.panel{width:min(100%,1120px)}.view-stack{gap:18px;display:grid}.hero-panel,.panel{border:1px solid var(--line);background:var(--flag-white);border-radius:8px;box-shadow:0 12px 34px #17171a14}.hero-panel{grid-template-columns:minmax(0,1fr) 150px;align-items:center;gap:22px;padding:30px;display:grid;position:relative;overflow:hidden}.hero-panel:before{content:"";background:linear-gradient(180deg, var(--flag-white) 0 50%, var(--flag-red) 50% 100%);width:10px;position:absolute;inset:0 auto 0 0}.hero-panel h2{max-width:780px;color:var(--ink);margin:0;font-size:2.35rem;line-height:1.06}.hero-panel p,.panel p{color:var(--muted)}.hero-meter{aspect-ratio:1;background:linear-gradient(180deg, var(--flag-white) 0 50%, var(--flag-red) 50% 100%);color:var(--ink);text-align:center;border:1px solid #e8b5c0;border-radius:8px;place-items:center;display:grid}.hero-meter span,.metric-grid strong{font-size:2rem;font-weight:850;display:block}.hero-meter small,.metric-grid span{color:#4d535a;font-weight:750}.metric-grid,.card-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.metric-grid div,.mini-card,.timeline article,.verb-list article,.dictionary div,.phrase-list article,.quiz-list article,.flashcard{border:1px solid var(--line);background:var(--flag-white);border-radius:8px;padding:16px}.metric-grid div{border-bottom:4px solid var(--flag-red)}.panel{padding:24px}.panel h3{color:var(--ink);margin:0 0 16px;font-size:1.55rem}.timeline,.verb-list,.dictionary,.phrase-list,.quiz-list{gap:12px;display:grid}.timeline span,.phrase-list span{color:var(--flag-red-dark);text-transform:uppercase;font-size:.78rem;font-weight:850}h4{color:var(--ink);margin:6px 0}.verb-list article,.dictionary div,.phrase-list article{gap:6px;display:grid}.verb-list article>div,.dictionary div{grid-template-columns:170px minmax(0,1fr);align-items:baseline}.dictionary div,.verb-list article>div{display:grid}.verb-list span,.dictionary span{color:var(--muted)}.flashcard{text-align:center;background:linear-gradient(180deg, var(--flag-white) 0 72%, #fff1f4 72% 100%);place-items:center;min-height:190px;display:grid}.flashcard p{margin:0;font-size:1.1rem}.flashcard strong{color:var(--flag-red-dark);font-size:1.6rem}.button-row,.option-row{flex-wrap:wrap;gap:10px;margin-top:14px;display:flex}.button-row button,.option-row button{text-align:center;border:1px solid #cfd3d8}.button-row button:hover,.option-row button:hover{border-color:var(--flag-red)}.option-row button.correct{border-color:var(--flag-red);color:var(--flag-red-dark);background:#fff}.option-row button.wrong{background:#ffe4e9}.quiz-score{font-weight:800}@media (width<=860px){.app-shell{grid-template-columns:1fr}.sidebar{padding:22px}.content{padding:18px}.hero-panel{grid-template-columns:1fr}.hero-meter{width:140px}.metric-grid,.card-grid,.verb-list article>div,.dictionary div{grid-template-columns:1fr}}@media (width<=520px){.brand-block h1{font-size:2rem}.hero-panel h2{font-size:1.8rem}.panel{padding:18px}.main-nav{grid-template-columns:1fr 1fr}.main-nav button{min-height:48px;font-size:.9rem}}