:root{
  --paper:#F6F4EF; --card:#FFFFFF; --ink:#1A2E35; --ink-soft:#516168;
  --petrol:#14505C; --petrol-d:#0E3B44; --amber:#E4A11B; --amber-d:#C98708;
  --lingon:#A6324A; --sage:#5E8A66; --mist:#E6E1D6; --mist-d:#D6D0C2;
  --shadow:0 1px 2px rgba(26,46,53,.04),0 8px 24px rgba(26,46,53,.06);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{font-family:'Hanken Grotesk',system-ui,sans-serif;background:var(--paper);color:var(--ink);
  -webkit-font-smoothing:antialiased;line-height:1.5;overscroll-behavior-y:none}
h1,h2,h3{font-family:'Fraunces',Georgia,serif;font-weight:600;line-height:1.15;margin:0}
.app{max-width:480px;margin:0 auto;min-height:100vh;position:relative;padding-bottom:78px}
.hidden{display:none!important}

.screen{display:none;padding:20px 18px 8px;animation:fade .35s ease}
.screen.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.eyebrow{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--amber-d);font-weight:600}
.muted{color:var(--ink-soft)}
.center{text-align:center}
.card{background:var(--card);border:1px solid var(--mist);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.btn{border:none;border-radius:14px;font-family:inherit;font-weight:600;font-size:16px;padding:14px 18px;cursor:pointer;width:100%;transition:transform .08s,background .15s}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--amber);color:#3a2a06}
.btn-primary:active{background:var(--amber-d)}
.btn-dark{background:var(--petrol);color:#fff}
.btn-ghost{background:transparent;color:var(--petrol);border:1.5px solid var(--mist-d)}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--paper);border:1px solid var(--mist);border-radius:999px;padding:5px 12px;font-size:13px;font-weight:600}
.speak{background:none;border:none;cursor:pointer;color:var(--petrol);padding:2px;display:inline-flex;vertical-align:middle}
.speak:active{color:var(--amber-d)}
.field{width:100%;border:1.5px solid var(--mist-d);border-radius:14px;padding:13px 15px;font-family:inherit;font-size:16px;background:var(--card);outline:none;margin-top:8px}
.field:focus{border-color:var(--petrol)}
textarea.field{resize:none;min-height:96px}
.divi{height:1px;background:var(--mist);margin:20px 0}
.err{background:#FBF1EF;border:1px solid #EAD3D0;color:var(--lingon);padding:10px 14px;border-radius:12px;font-size:13px;margin-top:12px}
.sk{color:var(--ink-soft);font-size:14px;text-decoration:underline;background:none;border:none;cursor:pointer;font-family:inherit;display:block;margin:14px auto 0}

.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:10px}
.brand .dot{width:34px;height:34px;border-radius:11px;background:var(--petrol);color:#fff;display:grid;place-items:center;font-family:'Fraunces';font-weight:600;font-size:19px}
.brand b{font-family:'Fraunces';font-size:19px;font-weight:600}

.trappa{display:flex;align-items:flex-end;gap:7px;height:64px;margin:14px 0 6px}
.step{flex:1;border-radius:8px 8px 3px 3px;background:var(--mist);display:flex;justify-content:center;align-items:flex-start;padding-top:4px;font-size:11px;font-weight:700;color:var(--ink-soft)}
.step.done{background:var(--petrol);color:#fff}
.step.cur{background:var(--amber);color:#3a2a06;box-shadow:0 4px 14px rgba(228,161,27,.35)}
.progress{height:9px;background:var(--mist);border-radius:99px;overflow:hidden}
.progress > i{display:block;height:100%;background:linear-gradient(90deg,var(--amber),var(--amber-d));border-radius:99px;transition:width .6s}
.stats{display:flex;gap:10px;margin-top:16px}
.stat{flex:1;text-align:center;background:var(--paper);border:1px solid var(--mist);border-radius:14px;padding:12px 6px}
.stat b{display:block;font-family:'Fraunces';font-size:22px}
.stat span{font-size:11px;color:var(--ink-soft);letter-spacing:.03em}

.act{display:flex;gap:14px;align-items:center;text-align:left;margin-top:12px}
.act .ic{width:46px;height:46px;flex:none;border-radius:13px;display:grid;place-items:center;background:var(--paper);border:1px solid var(--mist)}
.act h3{font-size:17px}
.act p{margin:2px 0 0;font-size:13px;color:var(--ink-soft)}

#chatWrap{position:fixed;top:0;left:0;right:0;bottom:0;max-width:480px;margin:0 auto;display:none;flex-direction:column;background:var(--paper)}
#chatWrap.active{display:flex}
.chatHead{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--card);border-bottom:1px solid var(--mist)}
.chatHead .av{width:40px;height:40px;border-radius:50%;background:var(--petrol);color:#fff;display:grid;place-items:center;font-family:'Fraunces';font-size:18px}
.chatHead .x{margin-left:auto;background:none;border:none;font-size:26px;color:var(--ink-soft);cursor:pointer;line-height:1}
#msgs{flex:1;overflow-y:auto;padding:16px 14px;display:flex;flex-direction:column;gap:12px}
.msg{max-width:84%;padding:11px 14px;border-radius:16px;font-size:15px;white-space:pre-wrap}
.msg.assistant{background:var(--card);border:1px solid var(--mist);border-bottom-left-radius:5px;align-self:flex-start}
.msg.user{background:var(--petrol);color:#fff;border-bottom-right-radius:5px;align-self:flex-end}
.msg .ru{display:block;margin-top:6px;font-size:13px;color:var(--ink-soft);border-top:1px dashed var(--mist-d);padding-top:6px}
.msg.user .ru{color:#cfe0e4;border-color:rgba(255,255,255,.2)}
.correction{align-self:flex-start;max-width:88%;background:#FBF1EF;border:1px solid #EAD3D0;border-left:3px solid var(--lingon);border-radius:12px;padding:9px 12px;font-size:13px}
.correction b{color:var(--lingon)}
.chatBar{display:flex;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));background:var(--card);border-top:1px solid var(--mist)}
.chatBar textarea{flex:1;border:1px solid var(--mist-d);border-radius:14px;padding:11px 14px;font-family:inherit;font-size:15px;resize:none;max-height:110px;outline:none;background:var(--paper)}
.chatBar textarea:focus{border-color:var(--petrol)}
.chatBar .send{width:46px;flex:none;border-radius:14px;background:var(--amber);border:none;display:grid;place-items:center;cursor:pointer}
.chatBar .send:disabled{opacity:.4}
.typing{display:flex;gap:4px;padding:14px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--ink-soft);animation:bob 1s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes bob{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}

.opt{display:block;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--mist);border-radius:13px;padding:13px 15px;margin-top:9px;font-size:15px;font-family:inherit;cursor:pointer;transition:.12s}
.opt:active{transform:scale(.99)}
.opt.correct{border-color:var(--sage);background:#EDF4EE}
.opt.wrong{border-color:var(--lingon);background:#FBF1EF}
.q-count{font-size:13px;color:var(--ink-soft);font-weight:600;margin-bottom:6px}

.flash{perspective:1200px;height:230px;margin-top:6px}
.flash-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flash.flip .flash-inner{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;border-radius:20px;border:1px solid var(--mist);background:var(--card);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:22px;text-align:center;box-shadow:var(--shadow)}
.face.back{transform:rotateY(180deg);background:var(--petrol);color:#fff;border-color:var(--petrol)}
.face .sv{font-family:'Fraunces';font-size:30px;font-weight:600}
.face .ex{margin-top:14px;font-size:14px;color:var(--ink-soft)}
.face.back .ex{color:#cfe0e4}
.srsrow{display:flex;gap:8px;margin-top:14px}
.srsrow .btn{padding:12px 8px;font-size:14px}

.nav{position:fixed;bottom:0;left:0;right:0;max-width:480px;margin:0 auto;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-top:1px solid var(--mist);display:flex;padding:8px 4px calc(8px + env(safe-area-inset-bottom))}
.nav button{flex:1;background:none;border:none;display:flex;flex-direction:column;align-items:center;gap:3px;padding:5px 0;color:var(--ink-soft);font-family:inherit;font-size:10.5px;font-weight:600;cursor:pointer}
.nav button.on{color:var(--petrol)}
.nav button.on svg{stroke:var(--petrol)}
.nav svg{width:23px;height:23px;stroke:var(--ink-soft);fill:none;stroke-width:1.8}

.auth-hero{text-align:center;padding:44px 0 20px}
.auth-hero .mark{width:72px;height:72px;border-radius:22px;background:var(--petrol);color:#fff;display:grid;place-items:center;font-family:'Fraunces';font-size:38px;margin:0 auto 20px;box-shadow:0 10px 30px rgba(20,80,92,.28)}
.auth-hero h1{font-size:32px}
.auth-hero p{color:var(--ink-soft);margin:12px 8px 0;font-size:15px}
.tabs{display:flex;background:var(--paper);border:1px solid var(--mist);border-radius:14px;padding:4px;margin:0 0 6px}
.tabs button{flex:1;border:none;background:none;padding:10px;border-radius:10px;font-family:inherit;font-weight:600;font-size:15px;color:var(--ink-soft);cursor:pointer}
.tabs button.on{background:var(--card);color:var(--ink);box-shadow:var(--shadow)}

.hero{text-align:center;padding:34px 0 20px}
.hero .mark{width:72px;height:72px;border-radius:22px;background:var(--petrol);color:#fff;display:grid;place-items:center;font-family:'Fraunces';font-size:38px;margin:0 auto 20px;box-shadow:0 10px 30px rgba(20,80,92,.28)}
.hero h1{font-size:34px;letter-spacing:-.01em}
.hero p{color:var(--ink-soft);margin:12px 4px 0;font-size:16px}
.loader{text-align:center;padding:50px 10px}
.spin{width:38px;height:38px;border:3px solid var(--mist);border-top-color:var(--petrol);border-radius:50%;margin:0 auto 16px;animation:sp 1s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.badge-lvl{display:inline-block;font-family:'Fraunces';font-size:44px;font-weight:700;color:var(--petrol)}
.taglist{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}

/* auto-speak toggle + microphone */
.chatHead .spk-toggle{margin-left:auto;background:none;border:none;cursor:pointer;color:var(--mist-d);padding:5px;display:inline-flex;border-radius:9px}
.chatHead .spk-toggle.on{color:var(--petrol);background:var(--paper)}
.chatBar .mic{width:46px;flex:none;border-radius:14px;background:var(--paper);border:1px solid var(--mist-d);display:grid;place-items:center;cursor:pointer;color:var(--petrol)}
.chatBar .mic.rec{background:var(--lingon);border-color:var(--lingon);color:#fff;animation:pulse 1.2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(166,50,74,.45)}50%{box-shadow:0 0 0 7px rgba(166,50,74,0)}}

/* live voice conversation */
.chatHead .live-btn{margin-left:auto;display:inline-flex;align-items:center;gap:5px;background:var(--paper);border:1px solid var(--mist-d);color:var(--petrol);font-family:inherit;font-weight:700;font-size:13px;padding:6px 12px;border-radius:999px;cursor:pointer}
.chatHead .live-btn.on{background:var(--lingon);border-color:var(--lingon);color:#fff;animation:pulse 1.4s infinite}
.chatHead .spk-toggle{margin-left:0}
.live-status{display:none;text-align:center;font-size:13px;font-weight:600;color:var(--petrol);padding:9px 12px;background:var(--paper);border-top:1px solid var(--mist)}

/* level-check result + pronunciation button */
.assess{border-radius:16px;padding:16px;border:1px solid var(--mist)}
.assess b{font-family:'Fraunces';font-size:18px}
.assess p{margin:6px 0 0;font-size:14px;color:var(--ink-soft)}
.assess.up{background:#EDF4EE;border-color:var(--sage)}
.assess.down{background:#FBF1EF;border-color:var(--lingon)}
.assess.stay{background:var(--paper)}
.btn.rec-btn{background:var(--lingon);color:#fff;animation:pulse 1.2s infinite}