:root{
  --bg:#06101f;--bg2:#0a1830;--card:#0d1b33;--card2:#122541;--line:#223c61;
  --text:#f7fbff;--muted:#9fb0ca;--green:#65f0bb;--blue:#6ea8ff;--purple:#ae8cff;
  --yellow:#ffd166;--red:#ff7587;--shadow:0 22px 65px rgba(0,0,0,.25);
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:radial-gradient(circle at 10% 0%,#173a6b 0,#071425 30%,#050a13 100%);color:var(--text);min-height:100vh}
body.light{--bg:#edf4fb;--card:#fff;--card2:#f4f8fc;--line:#d7e3ef;--text:#102037;--muted:#64748b;background:#eef5fb}
button,input,select,textarea{font:inherit} button{cursor:pointer} a{color:inherit;text-decoration:none}
.shell{max-width:1240px;margin:auto;padding:14px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:950;font-size:21px}
.brand img{width:46px;height:46px;border-radius:15px;object-fit:cover;border:1px solid var(--line)}
.res{display:flex;gap:7px;flex-wrap:wrap;justify-content:flex-end}
.pill,.badge{border:1px solid var(--line);background:color-mix(in srgb,var(--card) 85%,transparent);border-radius:999px;padding:8px 11px;color:var(--text)}
.badge{display:inline-block;padding:6px 9px;font-size:12px}.premium{background:linear-gradient(135deg,#3c3515,#20332a);border-color:#8a7331;color:#ffe7a1}
.card{background:linear-gradient(180deg,color-mix(in srgb,var(--card) 97%,transparent),color-mix(in srgb,var(--bg) 96%,transparent));border:1px solid var(--line);border-radius:24px;padding:20px;box-shadow:var(--shadow)}
.grid{display:grid;grid-template-columns:1.25fr .75fr;gap:16px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
h1,h2,h3,p{margin-top:0}h1{font-size:34px;line-height:1.06}.muted{color:var(--muted)}
.btn{border:0;border-radius:14px;padding:11px 15px;font-weight:850}.btn-primary{background:linear-gradient(135deg,var(--green),#8cf8d7);color:#04151b}.btn-secondary{background:var(--card2);border:1px solid var(--line);color:var(--text)}.btn-danger{background:#341724;border:1px solid #673148;color:#ffdce3}.btn-small{padding:8px 10px;border-radius:10px;font-size:13px}
.actions{display:flex;gap:8px;flex-wrap:wrap}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-top:16px}.stat{background:var(--card2);border:1px solid var(--line);border-radius:17px;padding:13px}.stat b{font-size:22px;display:block}
.progress{height:10px;background:var(--bg);border:1px solid var(--line);border-radius:999px;overflow:hidden}.bar{height:100%;background:linear-gradient(90deg,var(--blue),var(--green))}
.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px}.screen{display:none}.screen.active{display:block}
.nav{position:sticky;bottom:8px;z-index:50;margin-top:16px;display:grid;grid-template-columns:repeat(7,1fr);gap:6px;padding:7px;background:color-mix(in srgb,var(--bg) 92%,transparent);border:1px solid var(--line);border-radius:18px;backdrop-filter:blur(12px)}
.nav button{background:transparent;border:0;color:var(--muted);padding:9px 3px;border-radius:11px}.nav button.active{background:var(--card2);color:var(--text)}
.hero{padding:26px}.feature{background:var(--card2);border:1px solid var(--line);border-radius:18px;padding:15px}.feature b{display:block;margin-bottom:5px}.feature.click{cursor:pointer;transition:.15s}.feature.click:hover{transform:translateY(-2px);border-color:#4879a8}
.login{max-width:510px;margin:42px auto}.field{display:grid;gap:6px;margin:10px 0}input,select,textarea{width:100%;background:var(--bg);color:var(--text);border:1px solid var(--line);border-radius:13px;padding:11px}textarea{min-height:100px}
.onboarding{max-width:760px;margin:25px auto}.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.choice{background:var(--card2);border:1px solid var(--line);border-radius:16px;padding:14px;cursor:pointer}.choice.selected{outline:2px solid var(--green)}
.tutor-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.tutor{background:var(--card2);border:1px solid var(--line);border-radius:20px;padding:14px;cursor:pointer;transition:.15s}.tutor:hover{transform:translateY(-2px)}.tutor.active{outline:2px solid var(--green)}.avatar{height:160px;border-radius:17px;display:flex;align-items:end;justify-content:center;font-size:72px;padding-bottom:14px;background:linear-gradient(145deg,#183e69,#1a6e5d);overflow:hidden}.avatar.a2{background:linear-gradient(145deg,#503b70,#2d5d8d)}.avatar.a3{background:linear-gradient(145deg,#7a4938,#3b607b)}.avatar.a4{background:linear-gradient(145deg,#285c4b,#645585)}.avatar.a5{background:linear-gradient(145deg,#73465f,#266e79)}.avatar.a6{background:linear-gradient(145deg,#2c4d7d,#7d5731)}
.chat-layout{display:grid;grid-template-columns:300px 1fr;gap:14px}.tutor-panel{text-align:center}.tutor-big{height:310px;border-radius:22px;display:flex;align-items:center;justify-content:center;font-size:130px;background:linear-gradient(160deg,#1b4777,#1e8068);position:relative}.talk-ring{position:absolute;inset:16px;border:3px solid transparent;border-radius:20px}.speaking .talk-ring{border-color:var(--green);animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.35}}
.chat{height:430px;overflow:auto;background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:14px;display:flex;flex-direction:column;gap:10px}.msg{max-width:86%;padding:11px 13px;border-radius:15px;line-height:1.42}.msg.ai{align-self:flex-start;background:var(--card2)}.msg.user{align-self:flex-end;background:#154b3d;color:#fff}.correction{border-left:3px solid var(--yellow);padding-left:10px;font-size:13px;color:var(--muted);margin-top:5px}
.chatbar{display:flex;gap:7px;margin-top:9px}.chatbar input{flex:1}.suggestions{display:flex;gap:7px;overflow:auto;padding:8px 0}.suggestions button{white-space:nowrap}
.segment{display:flex;border:1px solid var(--line);border-radius:14px;padding:4px;background:var(--bg)}.segment button{flex:1;border:0;background:transparent;color:var(--muted);border-radius:10px;padding:8px}.segment button.active{background:var(--card2);color:var(--text)}
.lesson-list,.scenario-list{display:grid;gap:9px}.item{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--card2);border:1px solid var(--line);border-radius:16px;padding:13px}.item-left{display:flex;align-items:center;gap:10px}.roundicon{width:42px;height:42px;border-radius:13px;background:#173456;display:grid;place-items:center;font-size:20px}
.skill{display:grid;grid-template-columns:120px 1fr 42px;gap:10px;align-items:center;margin:10px 0}.skill span:last-child{text-align:right}
.word-card{padding:18px;border-radius:18px;background:var(--card2);border:1px solid var(--line);text-align:center}.word-card .word{font-size:30px;font-weight:900}.quiz-option{width:100%;text-align:left;margin:5px 0;background:var(--card2);border:1px solid var(--line);color:var(--text);padding:12px;border-radius:13px}
.profile-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 0;border-bottom:1px solid var(--line)}
.toast{position:fixed;right:16px;bottom:84px;z-index:99;background:var(--card2);border:1px solid var(--line);border-radius:14px;padding:11px 14px;box-shadow:var(--shadow);display:none}
dialog{border:1px solid var(--line);border-radius:22px;background:var(--card);color:var(--text);padding:20px;max-width:650px;width:calc(100% - 28px)}dialog::backdrop{background:#000a}
@media(max-width:900px){.grid,.grid2,.grid3,.grid4,.chat-layout{grid-template-columns:1fr}.tutor-grid{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.nav{grid-template-columns:repeat(4,1fr)}.chat-layout .tutor-panel{display:none}.choice-grid{grid-template-columns:1fr}.shell{padding:10px}h1{font-size:28px}}
@media(max-width:520px){.tutor-grid{grid-template-columns:1fr 1fr}.avatar{height:125px;font-size:54px}.topbar{align-items:flex-start}.brand span.badge{display:none}}