:root{color:#172033;font-synthesis:none;text-rendering:optimizelegibility;background:#f5f7f4;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{grid-template-columns:320px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{color:#f7fbf7;background:#17342f;flex-direction:column;gap:24px;padding:28px;display:flex}.brand-block h1{color:#fff;margin:0;font-size:2.45rem;line-height:1}.brand-block p:last-child,.sidebar-note{color:#dbe8df}.eyebrow{color:#d44b3f;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{color:#17342f;text-align:left;background:#fff;border-radius:8px;padding:10px 12px;font-weight:750}.main-nav button{color:#f6faf7;background:#ffffff17}.main-nav button.active,.main-nav button:hover{color:#172033;background:#f8d44c}.sidebar-note{border-top:1px solid #ffffff2e;margin-top:auto;padding-top:18px;font-size:.95rem}.sidebar-note small{color:#aebfb5;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{background:#fff;border:1px solid #d8ded8;border-radius:8px;box-shadow:0 12px 34px #18242814}.hero-panel{grid-template-columns:minmax(0,1fr) 150px;align-items:center;gap:22px;padding:30px;display:grid;overflow:hidden}.hero-panel h2{color:#101d2a;max-width:780px;margin:0;font-size:2.35rem;line-height:1.06}.hero-panel p,.panel p{color:#56616d}.hero-meter{aspect-ratio:1;color:#172033;text-align:center;background:#f8d44c;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:#44505a;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{background:#fff;border:1px solid #dbe2dc;border-radius:8px;padding:16px}.panel{padding:24px}.panel h3{color:#101d2a;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:#b2332b;text-transform:uppercase;font-size:.78rem;font-weight:850}h4{color:#172033;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:#586573}.flashcard{text-align:center;place-items:center;min-height:190px;display:grid}.flashcard p{margin:0;font-size:1.1rem}.flashcard strong{color:#b2332b;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 #cbd5d2}.option-row button.correct{background:#bfe6c7}.option-row button.wrong{background:#f3b8b2}.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}}