:root{--ink:#102a34;--muted:#60737c;--blue:#0d5c75;--blue2:#e0f1f7;--paper:#f6f9fb;--card:#fff;--line:#d9e4e9;--gold:#f4b942;--radius:22px}*{box-sizing:border-box}html{overflow-x:hidden;scroll-behavior:smooth}body{margin:0;min-width:0;overflow-x:hidden;background:var(--paper);color:var(--ink);font-family:Tahoma,"Segoe UI",Arial,sans-serif;line-height:1.75}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.skip{position:absolute;top:-80px;right:1rem;background:#fff;padding:.5rem;z-index:20}.skip:focus{top:1rem}header{width:min(1160px,calc(100% - 32px));min-height:82px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:10px;font-weight:800}.brand img{width:48px;height:48px}.brand span{display:grid;line-height:1.2}.brand small{font-size:.7rem;color:var(--muted);font-weight:500;margin-top:3px}nav{display:flex;gap:24px}nav a:hover{color:var(--blue)}.menu{display:none;border:0;background:transparent;font-size:1.6rem}main{width:min(1160px,calc(100% - 32px));margin:auto;padding-bottom:80px}section{margin-block:52px}.hero{display:grid;grid-template-columns:1.25fr .75fr;gap:50px;align-items:center;min-height:560px;padding:70px clamp(22px,5vw,76px);background:linear-gradient(135deg,#e9f5f9,#fff);border:1px solid var(--line);border-radius:36px}.eyebrow{display:block;color:var(--blue);font-weight:800;font-size:.86rem;letter-spacing:.04em}.hero h1,.page-head h1{font-size:clamp(2.25rem,6vw,4.5rem);line-height:1.15;margin:.3em 0}.hero h1 em{color:var(--blue);font-style:normal}.hero p,.page-head p{font-size:1.08rem;color:var(--muted);max-width:670px}.actions,.lesson-actions,.flash-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.btn{display:inline-flex;justify-content:center;align-items:center;border:1px solid var(--blue);border-radius:12px;padding:11px 20px;background:#fff;color:var(--blue);font-weight:700}.btn.primary{background:var(--blue);color:#fff}.btn.light{background:#fff;color:var(--ink);border-color:#fff}.stats{display:flex;flex-wrap:wrap;gap:22px;margin-top:38px}.stats span{display:grid;color:var(--muted);font-size:.85rem}.stats b{font-size:1.45rem;color:var(--ink)}.hero-board{direction:ltr;display:grid;grid-template-columns:repeat(3,72px);grid-auto-rows:72px;justify-content:center;transform:rotate(-3deg)}.hero-board i{display:grid;place-items:center;border:1px solid #b8cbd3;background:#fff;font-style:normal;font-size:1.5rem;font-weight:900}.hero-board .on{background:var(--blue);color:#fff}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}.section-head h2,.split h2{font-size:2rem;margin:.2em 0}.word-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.word-card{min-width:0;display:grid;gap:7px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;transition:.2s}.word-card:hover{transform:translateY(-3px);border-color:#88b6c6}.word-card b{font-size:1.35rem;color:var(--blue);overflow-wrap:anywhere}.word-card span{font-weight:700}.word-card small{color:var(--muted)}.split{display:grid;grid-template-columns:1fr 1fr;gap:18px}.split article{padding:42px;background:var(--blue2);border-radius:var(--radius)}.split .dark{background:var(--ink);color:#fff}.split .dark p{color:#c7d5da}.page-head{padding:65px 0 30px}.page-head h1{font-size:clamp(2.2rem,5vw,3.8rem)}.search{display:flex;align-items:center;gap:10px;max-width:650px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 15px;margin-top:28px}.search input{width:100%;border:0;outline:0;padding:15px;background:transparent}.muted{color:var(--muted)}.crumb{padding-top:30px;color:var(--muted);font-size:.9rem}.lesson{max-width:850px;margin:34px auto;background:#fff;border:1px solid var(--line);border-radius:28px;padding:clamp(22px,5vw,56px)}.lesson-top{display:flex;justify-content:space-between;gap:24px;align-items:center}.tag,.pos{display:inline-block;background:var(--blue2);color:var(--blue);border-radius:99px;padding:4px 12px;font-size:.83rem}.lesson h1{font-size:clamp(2.5rem,8vw,5.5rem);line-height:1;margin:.22em 0}.lesson.grammar h1{font-size:clamp(2rem,6vw,3.5rem);line-height:1.25}.meaning{font-size:1.5rem;font-weight:800;margin:.4em 0}.speak{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:16px;background:#fff;padding:14px;flex:0 0 auto}.speak b{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--blue);color:#fff}.speak span{display:grid;font-weight:700}.speak small{color:var(--muted);font-weight:400}.example,.mini-quiz,.grammar section{margin:34px 0 0;padding:26px;background:var(--paper);border-radius:18px}.example>span,.mini-quiz>span{color:var(--blue);font-weight:800}.example p[dir=ltr],.mini-quiz p[dir=ltr]{font-size:1.35rem;line-height:1.5}.text-speak{border:0;background:transparent;color:var(--blue);font-weight:700}.mini-quiz input{max-width:300px;width:100%;padding:10px;border:1px solid var(--line);border-radius:10px;margin:5px}.feedback{font-weight:700}.grammar-list{display:grid;gap:12px}.grammar-card{display:flex;align-items:center;gap:20px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:16px}.grammar-card>span{font-size:1.7rem;font-weight:900;color:#9cb1ba}.grammar-card h2{margin:0;font-size:1.2rem}.grammar-card p{margin:3px 0;color:var(--muted)}.examples>div{border-bottom:1px solid var(--line);padding:10px 0}.examples>div:last-child{border:0}.game-head label{display:flex;align-items:center;gap:12px;font-weight:700}.game-head select{padding:10px;border:1px solid var(--line);border-radius:10px;background:#fff}.crossword{background:#fff;border:1px solid var(--line);padding:clamp(14px,4vw,35px);border-radius:24px}.game-status{display:flex;justify-content:space-between;margin-bottom:20px}.game-status button{border:0;background:transparent;color:var(--blue)}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.7fr);gap:30px;align-items:start}.grid{display:grid;gap:2px;max-width:650px;overflow:auto;padding-bottom:6px}.cell{aspect-ratio:1;min-width:29px;position:relative}.cell input{width:100%;height:100%;min-height:29px;text-align:center;text-transform:uppercase;border:1px solid #b7c7ce;border-radius:2px;font-weight:800;padding:0}.cell input:focus{outline:3px solid #75b9cf;z-index:2}.cell.block{background:transparent}.cell small{position:absolute;left:2px;top:-2px;font-size:.55rem;pointer-events:none}.clues{margin:0;padding-right:24px}.clues li{padding:10px;border-bottom:1px solid var(--line)}.clues p{direction:ltr;text-align:left;margin:0;font-weight:700}.clues button{border:0;background:transparent;color:var(--blue);padding:0}.help{display:none;color:var(--muted);font-size:.9rem}.help.open{display:block}.game-message{font-weight:800;color:var(--blue)}.flash-wrap{max-width:700px;margin:auto}.flashcard{min-height:390px;background:linear-gradient(135deg,#fff,#eaf5f8);border:1px solid var(--line);border-radius:28px;padding:44px;text-align:center;display:flex;flex-direction:column;justify-content:center}.flashcard h2{font-size:clamp(3rem,10vw,6rem);margin:.2em}.flashcard button{border:0;background:transparent;color:var(--blue)}.flash-actions{justify-content:center}.legal{max-width:780px;margin:60px auto;background:#fff;padding:clamp(24px,5vw,56px);border-radius:24px;border:1px solid var(--line)}.legal h1{font-size:2.8rem}.legal h2{margin-top:2rem}footer{background:var(--ink);color:#fff;padding:45px max(16px,calc((100% - 1160px)/2));display:grid;grid-template-columns:1fr auto;gap:30px}footer p,footer small{color:#aebfc5}footer>div:nth-child(2){display:grid;gap:8px}.footer-credit{color:#fff;text-decoration:underline;text-underline-offset:4px}.footer-credit:hover{color:#d9eef5}
@media(max-width:820px){header{min-height:70px;position:relative}.menu{display:block}header nav{display:none;position:absolute;z-index:10;top:68px;left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px;box-shadow:0 12px 30px #16394522}header nav.open{display:grid}.hero{grid-template-columns:1fr;min-height:0;padding-block:45px}.hero-board{grid-template-columns:repeat(3,54px);grid-auto-rows:54px}.word-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.split,.game-layout{grid-template-columns:1fr}.lesson-top{align-items:flex-start}.game-layout{overflow:hidden}.grid{max-width:100%}}
@media(max-width:520px){main,header{width:min(100% - 22px,1160px)}.hero{border-radius:22px}.hero h1{font-size:2.3rem}.word-grid{grid-template-columns:1fr}.section-head{align-items:flex-start;flex-direction:column}.split{grid-template-columns:1fr}.lesson-top{display:grid}.speak{width:100%}.lesson{padding:20px}.example,.mini-quiz,.grammar section{padding:18px}.game-head label{align-items:flex-start;flex-direction:column}.crossword{padding:10px}.game-layout{gap:18px}.cell{min-width:25px}.cell input{min-height:25px;font-size:.8rem}.flashcard{padding:22px;min-height:340px}footer{grid-template-columns:1fr}.legal h1{font-size:2.1rem}}
.challenge-head{display:flex;align-items:center;justify-content:space-between;gap:30px;margin:48px 0 26px;padding:42px;background:linear-gradient(135deg,#e8f5f9,#fff);border:1px solid var(--line);border-radius:28px}.challenge-head h1{font-size:clamp(2.6rem,7vw,4.8rem);line-height:1;margin:.2em 0}.challenge-head p{max-width:700px;color:var(--muted);font-size:1.08rem}.best-box{min-width:135px;display:grid;text-align:center;background:var(--ink);color:#fff;padding:22px;border-radius:20px}.best-box b{font-size:2.5rem;line-height:1.2;color:var(--gold)}.best-box small,.best-box span{color:#c7d5da}.challenge-panel{max-width:920px;margin:22px auto;background:#fff;border:1px solid var(--line);border-radius:24px;padding:clamp(20px,4vw,38px)}.challenge-panel[hidden]{display:none}.challenge-panel fieldset{border:0;padding:0;margin:0 0 28px}.challenge-panel legend{font-size:1.15rem;font-weight:800;margin-bottom:12px}.choice-row{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.choice-row.compact{grid-template-columns:repeat(3,1fr)}.choice-row label{cursor:pointer;min-width:0}.choice-row input{position:absolute;opacity:0;pointer-events:none}.choice-row span{height:100%;display:grid;align-content:center;min-height:82px;padding:12px;text-align:center;border:1px solid var(--line);border-radius:14px;font-weight:800;transition:.15s}.choice-row small{display:block;color:var(--muted);font-weight:400}.choice-row input:checked+span{background:var(--blue2);border-color:var(--blue);color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}.choice-row input:focus-visible+span{outline:3px solid #75b9cf}.wide{width:100%;min-height:52px}.challenge-stats{display:flex;justify-content:space-between;gap:12px;color:var(--muted)}.challenge-stats b{color:var(--ink)}.progress-track{height:8px;margin:15px 0 28px;background:#e6eef2;border-radius:99px;overflow:hidden}.progress-track i{display:block;width:10%;height:100%;background:var(--blue);transition:.25s}.challenge-prompt{text-align:center;min-height:170px;display:grid;place-content:center;gap:12px}.challenge-prompt .question-kind{color:var(--blue);font-weight:800}.challenge-prompt h2{font-size:clamp(1.8rem,5vw,3.2rem);line-height:1.35;margin:0}.challenge-prompt h2[dir=ltr]{font-family:Arial,sans-serif}.listen-word{display:grid;place-items:center;width:92px;height:92px;margin:auto;border:0;border-radius:50%;background:var(--blue);color:#fff;font-size:2rem;box-shadow:0 10px 24px #0d5c7533}.challenge-answers{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:20px 0}.answer-option{min-height:62px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:12px;font-weight:800}.answer-option:hover{border-color:var(--blue)}.answer-option.correct{background:#e4f7ed;border-color:#18724b;color:#145b3d}.answer-option.wrong{background:#fff0f0;border-color:#a33;color:#8b2525}.answer-option:disabled{cursor:default}.typing-answer{display:flex;gap:10px;max-width:560px;margin:auto}.typing-answer input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:13px;font-size:1.15rem}.challenge-feedback{margin:18px 0;padding:18px;border-radius:14px;background:var(--paper)}.challenge-feedback.good{background:#e4f7ed}.challenge-feedback.bad{background:#fff0f0}.challenge-feedback b{font-size:1.2rem}.challenge-feedback p{margin:4px 0}.result-card{text-align:center;padding-block:55px}.result-card> b{display:block;font-size:clamp(3rem,9vw,6rem);color:var(--blue);line-height:1.2}.result-card .actions{justify-content:center}
@media(max-width:820px){header nav{gap:12px}.challenge-head{align-items:flex-start}.choice-row{grid-template-columns:repeat(2,1fr)}.choice-row label:first-child{grid-column:1/-1}}
@media(max-width:520px){.challenge-head{display:grid;padding:24px}.best-box{grid-template-columns:auto auto auto;align-items:center;justify-content:center;gap:8px;padding:14px}.best-box b{font-size:1.7rem}.choice-row,.choice-row.compact{grid-template-columns:1fr 1fr}.choice-row label:first-child{grid-column:1/-1}.challenge-stats{font-size:.86rem}.challenge-answers{grid-template-columns:1fr}.typing-answer{display:grid}.challenge-prompt{min-height:145px}.challenge-panel{padding:18px}}