:root{--blue:#294b67;--red:#a9343e;--ink:#243442;--muted:#687681;--soft:#f5f6f7;--line:#dde4e8}
*{box-sizing:border-box}
body{margin:0;font-family:Montserrat,Arial,sans-serif;color:var(--ink);background:#fff}
.top{height:76px;display:flex;align-items:center;justify-content:space-between;max-width:1180px;margin:auto;padding:0 24px;border-bottom:1px solid var(--line)}
.brand{font-size:28px;font-weight:800;color:var(--red);text-decoration:none}
.brand span{color:var(--blue)}
.return-link{color:var(--blue);text-decoration:none;font-weight:600;font-size:14px}
main{max-width:1180px;margin:auto;padding:0 24px 70px}
.hero{display:grid;grid-template-columns:1fr 340px;gap:70px;align-items:center;padding:68px 0}
.label{color:var(--red);font-weight:700;font-size:12px;letter-spacing:.1em}
.hero h1{font-size:52px;line-height:1.1;color:var(--blue);margin:15px 0}
.hero h1 em{font-style:normal;color:var(--red)}
.hero p{color:var(--muted);font-size:17px;line-height:1.7;max-width:650px}
.summary{padding:30px;background:var(--soft);border-radius:16px}
.summary strong{font-size:42px;color:var(--blue)}
.summary span{color:var(--muted)}
.progress{height:8px;background:#dfe5e8;border-radius:10px;margin:20px 0;overflow:hidden}
.progress i{display:block;width:0;height:100%;background:var(--red);transition:.3s}
.summary button,.primary{background:var(--red)!important;color:#fff!important;border-color:var(--red)!important}
.summary button{width:100%;border:0;border-radius:7px;padding:13px;font:700 14px Montserrat;cursor:pointer}
.toolbar{position:sticky;top:0;z-index:3;background:#fff;display:flex;gap:10px;padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.search{flex:1;display:flex;align-items:center;border:1px solid var(--line);border-radius:7px;padding:0 13px}
.search input{width:100%;border:0;outline:0;padding:11px;font:500 14px Montserrat}
.toolbar select,.mode,.card-actions button,#quizSpeak,#nextQuestion{border:1px solid var(--line);background:#fff;border-radius:7px;padding:11px 14px;font:600 13px Montserrat;color:var(--blue);cursor:pointer}
.mode.active{background:var(--blue);color:#fff}
.stats{padding:22px 0;color:var(--muted);font-size:14px}
.course-head{display:flex;align-items:end;justify-content:space-between;padding:42px 0 22px}.course-head h2{font-size:32px;color:var(--blue);margin:0 0 7px}.course-head p{margin:0;color:var(--muted)}.course-head strong{font-size:30px;color:var(--red)}
.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.lesson-card{width:100%;display:grid;grid-template-columns:54px 1fr;gap:17px;padding:22px;border:1px solid var(--line);border-radius:14px;cursor:pointer;transition:.2s;background:#fff;text-align:left;font-family:Montserrat,Arial,sans-serif;color:var(--ink)}.lesson-card:hover,.lesson-card:focus-visible{transform:translateY(-2px);border-color:#9badba;box-shadow:0 10px 28px rgba(41,75,103,.1);outline:0}.lesson-card.done{background:#f6faf8;border-color:#b9d4c4}.lesson-no{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff!important;font-size:14px!important;font-weight:800}.lesson-card.done .lesson-no{background:#4f8965}.lesson-info{display:flex;flex-direction:column;align-items:flex-start}.lesson-card small,.section-kicker{font-size:10px;letter-spacing:.1em;color:var(--red);font-weight:800}.lesson-card .lesson-info>strong{margin:6px 0;color:var(--blue);font-size:18px}.lesson-card .lesson-goal{margin:0 0 12px;color:var(--muted);font-size:13px;font-weight:500;line-height:1.5}.lesson-card .lesson-action{font-size:12px;font-weight:800;color:var(--red)}
.back-course{margin:30px 0 8px;border:0;background:none;color:var(--red);font:700 13px Montserrat;cursor:pointer}.lesson-title{display:flex;justify-content:space-between;align-items:center;padding:28px 0 30px;border-bottom:1px solid var(--line)}.lesson-title h2{font-size:38px;color:var(--blue);margin:9px 0}.lesson-title p{margin:0;color:var(--muted)}.lesson-score{padding:12px 16px;border-radius:8px;background:var(--soft);color:var(--blue);font-size:13px;font-weight:700}.skill-nav{position:sticky;top:74px;z-index:2;background:#fff;display:flex;gap:25px;padding:17px 0;border-bottom:1px solid var(--line)}.skill-nav a{color:var(--blue);text-decoration:none;font-size:13px;font-weight:700}.lesson-section{padding:38px;border:1px solid var(--line);border-radius:16px;margin:24px 0;background:#fff}.lesson-section h3{font-size:26px;color:var(--blue);margin:9px 0 12px}.lesson-section>p{color:var(--muted);line-height:1.7}.lesson-words{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:24px}.lesson-word{display:grid;grid-template-columns:36px 1fr;column-gap:10px;padding:14px;background:var(--soft);border-radius:9px}.lesson-word button{grid-row:1/4;width:34px;height:34px;border:0;border-radius:50%;background:#fff;cursor:pointer}.lesson-word strong{color:var(--blue)}.lesson-word span{font-size:12px;color:var(--red);margin-top:3px}.lesson-word small{grid-column:2;color:var(--muted);margin-top:8px;line-height:1.4}.example-list,.dialogue{display:grid;gap:10px;margin-top:22px}.example-list>div,.dialogue>div{display:grid;grid-template-columns:38px 1fr auto;gap:12px;align-items:center;padding:14px;background:var(--soft);border-radius:9px}.example-list button,.dialogue button,.outline{border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:7px;padding:9px 11px;font:600 12px Montserrat;cursor:pointer}.example-list strong{color:var(--blue)}.example-list span{grid-column:2;color:var(--muted);font-size:13px}.dialogue b{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff}.dialogue span{font-weight:600;color:var(--blue);line-height:1.5}.practice-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.practice-grid .lesson-section{margin:0}.lesson-section textarea{width:100%;height:145px;resize:vertical;border:1px solid var(--line);border-radius:9px;padding:14px;font:500 13px Montserrat;outline:none}.complete-box{display:flex;justify-content:space-between;align-items:center;padding:25px 30px;background:var(--blue);color:#fff;border-radius:14px;margin:25px 0 50px}.complete-box div{display:flex;flex-direction:column;gap:6px}.complete-box span{font-size:12px;opacity:.75}.complete-box button{border:0;border-radius:8px;padding:13px 18px;font:700 13px Montserrat;cursor:pointer}
.writing-submit{display:flex;align-items:center;gap:12px;margin-top:12px}.writing-submit button{border:0;border-radius:8px;padding:12px 16px;font:700 12px Montserrat;cursor:pointer}.writing-submit button:disabled{opacity:.6}.writing-submit span{color:var(--muted);font-size:12px;line-height:1.5}
.word-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.word{border:1px solid var(--line);border-radius:11px;padding:17px;display:grid;grid-template-columns:1fr auto;gap:6px;background:#fff}
.word.learned{background:#f6faf8;border-color:#b9d4c4}
.word small{color:var(--red);font-size:10px;font-weight:700;text-transform:uppercase}
.word h3{color:var(--blue);font-size:19px;margin:3px 0}
.word p{color:var(--muted);margin:0;font-size:14px}
.word-actions{grid-row:1/4;grid-column:2;display:flex;flex-direction:column;gap:7px}
.word-actions button{width:34px;height:34px;border:1px solid var(--line);border-radius:50%;background:#fff;cursor:pointer}
.hidden{display:none!important}
.flash-wrap{max-width:650px;margin:48px auto;text-align:center}
.flash{width:100%;height:360px;border:0;background:transparent;perspective:1000px;position:relative;cursor:pointer}
.face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:20px;backface-visibility:hidden;transition:transform .5s;box-shadow:0 15px 45px rgba(41,75,103,.12);border:1px solid var(--line);background:#fff}
.face small{color:var(--red);font-weight:700;letter-spacing:.12em}
.face strong{font-size:45px;color:var(--blue);margin:22px}
.face i{font-style:normal;color:var(--muted);font-size:13px}
.example-cz{font-size:18px;font-weight:700;color:var(--blue);margin:2px 24px 8px}.example-vi{font-size:14px;color:var(--muted);margin:0 24px 18px}.face.back strong{font-size:32px;margin:15px}
.card-illustration{width:150px;height:105px;border-radius:18px;background:linear-gradient(135deg,#f4f6f7,#e8edf0);display:grid;place-items:center;font-size:55px;margin:15px 0 2px;box-shadow:inset 0 0 0 1px #e1e7ea;overflow:hidden;position:relative}.card-illustration img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.card-illustration b{font-weight:400}
.flash .back{transform:rotateY(180deg)}
.flash.flipped .front{transform:rotateY(180deg)}
.flash.flipped .back{transform:rotateY(360deg)}
.card-actions{display:flex;justify-content:center;gap:10px;margin-top:22px}
.quiz{max-width:680px;margin:48px auto;padding:38px;border:1px solid var(--line);border-radius:18px;text-align:center}
.quiz>p{color:var(--red);font-size:13px;font-weight:700}
.quiz h2{font-size:42px;color:var(--blue);margin:20px}
.answers{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:28px 0}
.answers button{padding:16px;border:1px solid var(--line);border-radius:9px;background:#fff;font:600 14px Montserrat;cursor:pointer}
.answers button.correct{background:#eaf5ee;border-color:#69a47d}
.answers button.wrong{background:#f9e9ea;border-color:#c76b73}
#quizResult{min-height:28px;font-weight:700}
footer{border-top:1px solid var(--line);max-width:1180px;margin:auto;padding:28px 24px;display:flex;gap:20px;align-items:center;color:var(--muted);font-size:13px}
footer strong{color:var(--blue);font-size:18px}
footer a{margin-left:auto;color:var(--red);font-weight:700}
@media(max-width:850px){.hero{grid-template-columns:1fr;gap:25px}.lesson-grid{grid-template-columns:1fr}.lesson-words{grid-template-columns:1fr 1fr}.practice-grid{grid-template-columns:1fr}
.word-grid{grid-template-columns:1fr 1fr}
.toolbar{flex-wrap:wrap}
.search{flex-basis:100%}
}
@media(max-width:560px){main{padding:0 16px 50px}
.top{height:64px;padding:0 16px}
.hero{padding:42px 0}
.hero h1{font-size:36px}
.summary{padding:22px}
.word-grid{grid-template-columns:1fr}
.mode{flex:1;padding:10px 5px}
.toolbar select{width:100%}
.flash{height:310px}
.face strong{font-size:34px}
.card-actions{display:grid;grid-template-columns:1fr 1fr}
.answers{grid-template-columns:1fr}
.quiz{padding:24px 18px}
.quiz h2{font-size:34px}
.lesson-title{align-items:flex-start;gap:20px}.lesson-title h2{font-size:30px}.lesson-score{white-space:nowrap}.skill-nav{overflow:auto;gap:18px}.lesson-section{padding:23px 18px}.lesson-words{grid-template-columns:1fr}.example-list>div,.dialogue>div{grid-template-columns:36px 1fr}.example-list button,.dialogue button{grid-column:2;width:max-content}.complete-box{align-items:flex-start;flex-direction:column;gap:18px;width:100%}.complete-box button{width:100%}
footer{flex-wrap:wrap}
footer a{margin-left:0}
}

.user-nav{display:flex;align-items:center;gap:18px;font-size:13px}.user-nav span{color:var(--muted)}.user-nav a{color:var(--red);font-weight:700;text-decoration:none}.auth-page{min-height:100vh;background:linear-gradient(135deg,#fff 58%,#f2f4f5 58%)}.auth-main{min-height:calc(100vh - 76px);display:grid;grid-template-columns:1fr 430px;gap:80px;align-items:center;padding-bottom:40px}.auth-intro h1{font-size:48px;line-height:1.15;color:var(--blue);margin:16px 0}.auth-intro h1 em{font-style:normal;color:var(--red)}.auth-intro p{max-width:620px;color:var(--muted);line-height:1.7}.auth-intro ul{list-style:none;padding:10px 0;margin:0;color:var(--blue);line-height:2}.auth-box{background:#fff;border:1px solid var(--line);border-radius:17px;padding:32px;box-shadow:0 18px 55px rgba(41,75,103,.12)}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin-bottom:25px}.auth-tabs button{border:0;background:#fff;padding:13px;font:700 14px Montserrat;color:var(--muted);cursor:pointer}.auth-tabs button.active{color:var(--red);border-bottom:3px solid var(--red)}.auth-box form label{display:block;font-size:13px;font-weight:600;color:var(--blue);margin:15px 0}.auth-box form input{display:block;width:100%;border:1px solid var(--line);border-radius:7px;padding:13px;margin-top:7px;font:500 14px Montserrat;outline:none}.auth-box form input:focus{border-color:var(--blue)}.auth-submit{width:100%;margin-top:8px;padding:14px;border:0;border-radius:7px;background:var(--red);color:#fff;font:700 14px Montserrat;cursor:pointer}.auth-error{background:#f9e9ea;color:#8d2730;border-radius:7px;padding:12px;margin-bottom:14px;font-size:13px}.privacy{font-size:11px;color:var(--muted);text-align:center;margin:18px 0 0;line-height:1.5}
@media(max-width:800px){.auth-main{grid-template-columns:1fr;gap:30px;padding-top:45px}.auth-intro h1{font-size:38px}.auth-box{max-width:520px;width:100%;margin:auto}.user-nav span{display:none}}