:root{
  --orange:#EE9A2E; --orange-d:#D8871F;
  --bg:#EFEFF4; --card:#fff; --line:#E3E3E8;
  --ink:#111114; --dim:#6B6B73; --red:#E5484D; --green:#159A55; --blue:#0A63C9;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg); color:var(--ink); font-size:17px; line-height:1.45;
  padding-bottom:60px;
}
header{
  position:sticky; top:0; z-index:50; background:var(--orange); color:#fff;
  padding:14px 12px 12px; display:grid; grid-template-columns:44px 1fr 44px; align-items:center;
  box-shadow:0 1px 0 rgba(0,0,0,.06);
}
#back{background:none;border:0;color:#fff;font-size:30px;line-height:1;cursor:pointer;padding:0;text-align:left;visibility:hidden}
#titles{text-align:center}
#h1{font-size:22px;font-weight:600}
#h2{font-size:17px;opacity:.95}
#gear{background:none;border:0;color:#fff;font-size:20px;cursor:pointer;text-align:right}
.wrap{max-width:720px;margin:0 auto;padding:14px 12px}
.card{background:var(--card);border-radius:12px;margin-bottom:18px;overflow:hidden}
.card h3{margin:0;padding:14px 16px 2px;font-size:14px;font-weight:600;color:var(--dim)}
.card h4{margin:0;padding:0 16px 12px;font-size:21px;font-weight:700}
.row{display:flex;align-items:center;gap:14px;padding:16px;border-top:1px solid var(--line);
  background:none;border-left:0;border-right:0;border-bottom:0;width:100%;font:inherit;color:inherit;
  text-align:left;cursor:pointer}
.row:active{background:#F2F2F5}
.row .ico{width:26px;text-align:center;font-size:19px;color:#8A8A90;flex:none}
.row .lab{flex:1}
.row .chev{color:#B8B8BE;font-size:20px}
.row .meta{font-size:13px;color:var(--dim)}
.row.done .ico{color:var(--green)}
.pill{font-size:12px;font-weight:600;background:#F0F0F4;color:var(--dim);border-radius:99px;padding:3px 9px}
.pill.ok{background:#E4F4EA;color:var(--green)}
.notice{background:#fff;border-radius:12px;padding:14px 16px;margin-bottom:18px;font-size:14px;color:var(--dim)}
.notice b{color:var(--ink)}

.instr{background:#FFF6E8;border-left:4px solid var(--orange);padding:12px 14px;border-radius:8px;margin-bottom:16px;font-size:15px}
.instr .tr{display:block;margin-top:6px;color:#8a6a2f;font-size:13px}
.text{background:#fff;border-radius:12px;padding:16px;margin-bottom:18px;white-space:pre-wrap}
.text .src{font-size:13px;color:var(--dim);margin-bottom:8px;text-transform:uppercase;letter-spacing:.05em}
.q{background:#fff;border-radius:12px;padding:14px 16px;margin-bottom:12px}
.q .stem{font-weight:600;margin-bottom:10px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:9px 10px;border:1px solid var(--line);
  border-radius:9px;margin-bottom:7px;cursor:pointer}
.opt input{margin-top:4px;flex:none}
.opt.sel{border-color:var(--orange);background:#FFF8ED}
.opt.correct{border-color:var(--green);background:#EAF7F0}
.opt.wrong{border-color:var(--red);background:#FDECEC}
.expl{font-size:14px;color:var(--dim);border-top:1px dashed var(--line);margin-top:8px;padding-top:8px}
button.act{background:var(--orange);color:#fff;border:0;border-radius:10px;padding:13px 18px;
  font-size:16px;font-weight:600;cursor:pointer;width:100%;margin-bottom:10px}
button.act.sec{background:#fff;color:var(--ink);border:1px solid var(--line)}
button.act:disabled{opacity:.5;cursor:default}
.btnrow{display:flex;gap:10px}
.btnrow button.act{margin-bottom:0}
textarea{width:100%;min-height:190px;border:1px solid var(--line);border-radius:10px;padding:12px;
  font:inherit;resize:vertical}
input[type=text],input[type=password],select{width:100%;border:1px solid var(--line);border-radius:9px;
  padding:10px;font:inherit;margin-bottom:10px}
.wc{font-size:13px;color:var(--dim);text-align:right;margin:-4px 0 12px}
.wc.bad{color:var(--red)}
table{width:100%;border-collapse:collapse;font-size:14px;background:#fff;border-radius:12px;overflow:hidden}
th,td{padding:9px 11px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#F7F7FA;font-size:13px;color:var(--dim)}
.timer{font-variant-numeric:tabular-nums;font-weight:600}
.audiobar{background:#fff;border-radius:12px;padding:14px 16px;margin-bottom:16px}
.audiobar .ctrls{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.audiobar button{background:#F0F0F4;border:0;border-radius:9px;padding:10px 14px;font:inherit;cursor:pointer}
.audiobar button.play{background:var(--orange);color:#fff;font-weight:600}
.status{font-size:13px;color:var(--dim);margin-top:8px}
details{background:#fff;border-radius:12px;padding:12px 16px;margin-bottom:16px}
summary{cursor:pointer;font-weight:600}
.script{white-space:pre-wrap;font-size:14px;color:var(--dim);margin-top:10px}
.scene{width:100%;border-radius:12px;display:block;background:#fff;margin-bottom:14px}
.big{font-size:40px;font-weight:700;text-align:center;margin:6px 0}
.center{text-align:center;color:var(--dim);font-size:14px}
.sheet{position:fixed;inset:0;background:rgba(0,0,0,.35);display:none;z-index:99;align-items:flex-end}
.sheet.on{display:flex}
.sheet .inner{background:#fff;width:100%;max-height:88vh;overflow:auto;border-radius:16px 16px 0 0;padding:18px}
.hidden{display:none}

.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.4);
  border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;margin-right:8px;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Teacher Avatar & Chat ── */
.task-tabs{display:flex;gap:8px;margin-bottom:14px}
.task-tab{background:#fff;border:1px solid var(--line);border-radius:9px;padding:10px 0;font:inherit;
  cursor:pointer;flex:1;font-weight:600;color:var(--dim);font-size:15px;transition:all .2s}
.task-tab.active{background:var(--orange);color:#fff;border-color:var(--orange)}
.task-desc-box{background:#FFF6E8;border-left:4px solid var(--orange);border-radius:8px;
  padding:12px 14px;margin-bottom:16px;font-size:14px;color:var(--ink)}
.avatar-section{display:flex;justify-content:center;margin-bottom:16px}
.avatar-wrap{display:flex;flex-direction:column;align-items:center;gap:8px}
.avatar-wrap svg{width:150px;height:150px;border-radius:50%;
  box-shadow:0 4px 18px rgba(238,154,46,.2);transition:box-shadow .4s,filter .4s}
.avatar-wrap.speaking svg{
  box-shadow:0 0 0 5px rgba(238,154,46,.35),0 0 0 10px rgba(238,154,46,.15),0 4px 22px rgba(238,154,46,.4);
  filter:drop-shadow(0 0 6px rgba(238,154,46,.6))}
.avatar-name{font-size:13px;font-weight:700;color:var(--dim);letter-spacing:.02em}
.sound-wave{display:flex;gap:3px;align-items:center;height:22px;opacity:0;transition:opacity .3s}
.avatar-wrap.speaking .sound-wave{opacity:1}
.sound-wave span{display:inline-block;width:3px;background:var(--orange);border-radius:3px;
  animation:wave .9s ease-in-out infinite}
.sound-wave span:nth-child(1){height:6px;animation-delay:0s}
.sound-wave span:nth-child(2){height:12px;animation-delay:.12s}
.sound-wave span:nth-child(3){height:20px;animation-delay:.24s}
.sound-wave span:nth-child(4){height:12px;animation-delay:.12s}
.sound-wave span:nth-child(5){height:6px;animation-delay:0s}
@keyframes wave{0%,100%{transform:scaleY(.4)} 50%{transform:scaleY(1.4)}}
.chat-box{background:#F7F7FA;border-radius:12px;padding:12px;
  min-height:180px;max-height:360px;overflow-y:auto;margin-bottom:14px;
  display:flex;flex-direction:column;gap:10px;scroll-behavior:smooth}
.chat-empty{color:var(--dim);font-size:14px;text-align:center;margin:auto;padding:20px}
.bubble{max-width:84%;display:flex;flex-direction:column;gap:3px}
.bubble-carmen{align-self:flex-start}
.bubble-user{align-self:flex-end}
.bubble-label{font-size:11px;font-weight:700;color:var(--dim);padding:0 4px;text-transform:uppercase;letter-spacing:.04em}
.bubble-label-user{text-align:right}
.bubble-text{padding:10px 14px;border-radius:14px;font-size:15px;line-height:1.45}
.bubble-carmen .bubble-text{background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px}
.bubble-user .bubble-text{background:var(--orange);color:#fff;border-bottom-right-radius:4px}
.bubble-typing .bubble-text{background:#fff;border:1px solid var(--line)}
.typing-dots span{display:inline-block;width:7px;height:7px;background:var(--dim);
  border-radius:50%;margin:0 2px;animation:dot .9s ease-in-out infinite}
.typing-dots span:nth-child(2){animation-delay:.18s}
.typing-dots span:nth-child(3){animation-delay:.36s}
@keyframes dot{0%,80%,100%{transform:scale(.6);opacity:.5} 40%{transform:scale(1);opacity:1}}
.mic-status{font-size:14px;color:var(--dim);text-align:center;margin-bottom:10px;min-height:22px;
  transition:color .3s}
.mic-status.listening{color:#E5484D;font-weight:600}
.input-area{background:#fff;border-radius:12px;padding:14px 16px;margin-bottom:14px}
.input-btns{display:flex;gap:10px}

/* ── Loading screen ── */
.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:60vh;gap:16px;color:var(--dim);font-size:15px;text-align:center;padding:20px}
.big-spinner{width:44px;height:44px;border:4px solid var(--line);border-top-color:var(--orange);
  border-radius:50%;animation:spin .8s linear infinite}

/* ── Landing page ── */
.landing-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:720px;margin:14px auto 0;padding:0 12px}
@media(min-width:500px){.landing-grid{grid-template-columns:repeat(3,1fr)}}
.level-card{background:#fff;border-radius:16px;padding:22px 12px 18px;cursor:pointer;text-align:center;
  border:2px solid transparent;transition:all .2s;box-shadow:0 2px 8px rgba(0,0,0,.07)}
.level-card:hover,.level-card:active{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.12);border-color:var(--lc)}
.level-badge{width:52px;height:52px;color:#fff;border-radius:50%;font-size:17px;font-weight:800;
  line-height:52px;margin:0 auto 10px;letter-spacing:.02em}
.level-label{font-size:15px;font-weight:700;margin-bottom:4px}
.level-desc{font-size:12px;color:var(--dim);line-height:1.4}

/* ── Exam grid ── */
.exam-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;
  max-width:720px;margin:0 auto 18px;padding:0 12px}
@media(max-width:380px){.exam-grid{grid-template-columns:repeat(4,1fr)}}
.exam-card{background:#fff;border-radius:12px;aspect-ratio:1;cursor:pointer;display:flex;
  flex-direction:column;align-items:center;justify-content:center;gap:2px;
  border:2px solid var(--line);transition:all .18s}
.exam-card:hover,.exam-card:active{border-color:var(--lc);box-shadow:0 4px 14px rgba(0,0,0,.1);transform:translateY(-1px)}
.exam-num{font-size:19px;font-weight:700}
.exam-badge{font-size:15px;line-height:1}