:root{color-scheme:dark;--bg:#071226;--panel:#111f39;--panel2:#172746;--text:#f7f8ff;--muted:#aeb9d3;--line:#2b3d60;--primary:#6d4aff;--accent:#30d5c8;--sidebar:280px;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}.app{min-height:100vh}.app>aside{position:fixed;inset:0 auto 0 0;width:var(--sidebar);padding:28px 18px;background:#09152a;border-right:1px solid var(--line);z-index:20}.brand{display:flex;gap:12px;align-items:center;padding:8px}.brand>span{display:grid;place-items:center;width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,#7257ff,#35cce8);font-size:24px}.brand b{display:block;font-size:21px}.brand small,.mobile-brand small{display:block;color:var(--muted);font-size:11px;letter-spacing:.12em;text-transform:uppercase}.language-switch{width:100%;margin:28px 0 22px;padding:15px;border:1px solid var(--line);border-radius:16px;background:var(--panel);color:var(--text);display:flex;gap:10px;align-items:center}.language-switch span{flex:1;text-align:left;font-weight:700}nav button{border:0;background:transparent;color:var(--muted)}aside nav{display:grid;gap:6px}aside nav button{display:flex;align-items:center;gap:14px;padding:14px;border-radius:14px;text-align:left;font-weight:700}aside nav button.active{background:linear-gradient(135deg,#34256f,#20335f);color:white}main{margin-left:var(--sidebar);min-height:100vh}.topbar{display:none}.bottom-nav{display:none}#content{max-width:1180px;margin:auto;padding:56px 42px 120px}.hero{padding:42px;border:1px solid var(--line);border-radius:28px;background:radial-gradient(circle at 90% 10%,#3b2d7a 0,transparent 40%),linear-gradient(135deg,#132442,#0b1830)}.hero p,.page-head p{color:#8fb3ff;letter-spacing:.16em;font-weight:800;font-size:12px}.hero h1,.page-head h1{font-size:clamp(36px,5vw,64px);margin:12px 0}.hero span,.page-head span{color:var(--muted);font-size:18px}.primary,.secondary{border:0;border-radius:14px;padding:14px 22px;font-weight:800;color:white}.primary{background:linear-gradient(135deg,#8055ff,#5938f2)}.secondary{background:var(--panel2);border:1px solid var(--line)}.hero .primary{display:block;margin-top:28px}.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}.card{width:100%;display:grid;grid-template-columns:54px 1fr auto auto;gap:14px;align-items:center;text-align:left;padding:20px;border:1px solid var(--line);border-radius:20px;background:var(--panel);color:var(--text)}.card:hover{transform:translateY(-2px);border-color:#6f63c7}.card-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:15px;background:#27265c;font-size:25px}.card strong,.card small{display:block}.card small{color:var(--muted);margin-top:5px}.card em{font-style:normal;color:#91a6cc}.panel{margin-top:22px;padding:24px;border:1px solid var(--line);border-radius:24px;background:var(--panel)}.panel h2{margin-top:0}.skill{display:grid;grid-template-columns:120px 1fr 46px;gap:12px;align-items:center;margin:15px 0}.skill div{height:9px;background:#243556;border-radius:99px;overflow:hidden}.skill i{display:block;height:100%;background:linear-gradient(90deg,#6248f4,#24d5c0)}.scenario-list{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:28px}.page-head{margin-bottom:25px}.word-list{margin-top:20px;display:grid;gap:10px}.word-list>div{display:grid;grid-template-columns:1fr 1fr 2fr;padding:14px;border-bottom:1px solid var(--line)}.word-list span,.word-list em{color:var(--muted);font-style:normal}.chat{height:min(680px,calc(100vh - 180px));display:grid;grid-template-rows:1fr auto;border:1px solid var(--line);border-radius:24px;overflow:hidden;background:var(--panel)}#chatMessages{padding:22px;overflow:auto;display:flex;flex-direction:column;gap:12px}.ai-msg,.user-msg,.error-msg{max-width:80%;padding:14px 16px;border-radius:17px;line-height:1.55}.ai-msg{background:#1c3154}.user-msg{align-self:flex-end;background:#5c43da}.error-msg{background:#532638}#chatForm{display:grid;grid-template-columns:1fr auto;gap:10px;padding:14px;border-top:1px solid var(--line)}#chatForm input,.provider input,.provider select,textarea{min-width:0;padding:13px;border:1px solid var(--line);border-radius:12px;background:#09152a;color:white}#chatForm button,.provider button{border:0;border-radius:12px;padding:0 18px;background:#6045e6;color:white}.language-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.lang{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:16px;border:1px solid var(--line);border-radius:15px;background:var(--panel2);color:white;text-align:left;font-size:20px}.lang.active{border-color:#775dff}.lang small{color:var(--muted)}.provider{display:grid;grid-template-columns:150px 1fr 1fr auto auto;gap:10px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}.provider small{grid-column:1/-1;color:#f5a2b5}.modal-backdrop{position:fixed;inset:0;z-index:100;background:rgba(2,7,18,.82);display:grid;place-items:center;padding:20px}.modal{width:min(900px,100%);max-height:calc(100dvh - 40px);display:grid;grid-template-rows:auto auto 1fr auto;background:#0d1a31;border:1px solid var(--line);border-radius:24px;overflow:hidden}.modal.small{width:min(520px,100%)}.modal header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid var(--line)}.modal header h2{margin:3px 0}.modal header button{width:44px;height:44px;border-radius:13px;border:1px solid var(--line);background:var(--panel);color:white}.modal-body{padding:24px;overflow:auto}.modal footer{padding:16px 24px;border-top:1px solid var(--line);display:flex;justify-content:flex-end}.progress{height:5px;background:#263858}.progress i{display:block;height:100%;background:var(--accent)}.lesson-words{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lesson-words button,.dialogue button,.choice,.choices button{padding:18px;border:1px solid var(--line);border-radius:17px;background:var(--panel);color:white;text-align:left}.lesson-words b,.lesson-words small,.lesson-words span{display:block}.lesson-words small,.lesson-words span{color:var(--muted);margin-top:4px}.dialogue{display:grid;gap:12px}.recall,.use,.complete,.review-modal .modal-body{text-align:center}.choice{width:100%;margin:6px}.choice.correct{border-color:#29cf97}.choice.wrong{border-color:#ee6680}.use textarea{display:block;width:100%;min-height:140px;margin:18px 0}.choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:26px}.review-modal h1{font-size:52px}.review-modal small{color:var(--muted)}
@media(max-width:800px){:root{--sidebar:0}.app>aside{display:none}main{margin:0}.topbar{display:flex;position:sticky;top:0;z-index:30;align-items:center;justify-content:space-between;padding:calc(var(--safe-top) + 14px) 18px 14px;background:rgba(7,18,38,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.topbar button{border:1px solid var(--line);background:var(--panel);color:white;padding:11px 14px;border-radius:14px}.bottom-nav{position:fixed;z-index:40;left:10px;right:10px;bottom:calc(8px + var(--safe-bottom));height:70px;display:grid;grid-template-columns:repeat(5,1fr);padding:5px;background:rgba(7,18,38,.96);border:1px solid var(--line);border-radius:22px;backdrop-filter:blur(18px)}.bottom-nav button{display:grid;place-items:center;border-radius:17px;font-size:11px}.bottom-nav button i{font-style:normal;font-size:18px}.bottom-nav button span{display:block}.bottom-nav button.active{background:#34296f;color:white}#content{padding:24px 16px calc(105px + var(--safe-bottom))}.hero{padding:25px}.hero h1,.page-head h1{font-size:36px}.hero span,.page-head span{font-size:15px}.quick-grid,.scenario-list{grid-template-columns:1fr}.card{grid-template-columns:48px 1fr auto;padding:16px}.card em{display:none}.skill{grid-template-columns:90px 1fr 40px}.language-grid{grid-template-columns:1fr}.provider{grid-template-columns:1fr}.provider small{grid-column:auto}.lesson-words{grid-template-columns:1fr}.choices{grid-template-columns:1fr}.modal-backdrop{padding:0}.modal,.modal.small{width:100%;height:100dvh;max-height:none;border:0;border-radius:0;padding-top:var(--safe-top);padding-bottom:var(--safe-bottom)}.modal header{padding:14px 18px}.modal-body{padding:18px}.word-list>div{grid-template-columns:1fr 1fr}.word-list em{grid-column:1/-1}}