:root{
  --bg:#0f1115;
  --bg-soft:#171a21;
  --card:#1d212b;
  --line:#2a2f3b;
  --txt:#e8eaf0;
  --muted:#98a0b3;
  --a:#4c8dff;
  --b:#22c58b;
  --warn:#f5a524;
  --danger:#ef4d5a;
  --radius:14px;
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f5f6fa; --bg-soft:#ffffff; --card:#ffffff; --line:#e2e5ee;
    --txt:#171a21; --muted:#606a80;
  }
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--txt);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  display:flex; flex-direction:column; overflow:hidden;
}

/* ---------- Topbar ---------- */
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:10px 14px; background:var(--bg-soft); border-bottom:1px solid var(--line);
}
.brand{display:flex; align-items:center; gap:10px}
.logo{font-size:26px}
.topbar h1{font-size:16px; margin:0; font-weight:650}
.topbar p{margin:2px 0 0; font-size:11.5px; color:var(--muted)}
.topbar-actions{display:flex; gap:6px}
/* 44px là ngưỡng tối thiểu để ngón tay bấm không trượt trên điện thoại */
.icon-btn{
  background:transparent; border:1px solid var(--line); color:var(--txt);
  width:44px; height:44px; border-radius:12px; font-size:17px; cursor:pointer;
}
.icon-btn:hover{background:var(--card)}

/* ---------- Chuyển giữa Phiên dịch và Bé học ---------- */
.appnav{
  display:grid; grid-template-columns:1fr 1fr; gap:8px;
  max-width:960px; width:100%; margin:0 auto; padding:10px 12px 0;
}
.app-tab{
  display:flex; flex-direction:column; align-items:center; gap:1px;
  padding:9px 8px; border-radius:14px; border:1px solid var(--line);
  background:var(--card); color:var(--muted); text-decoration:none;
  transition:border-color .15s, color .15s;
}
.app-tab span{font-size:19px; line-height:1.1}
.app-tab b{font-size:13.5px; color:var(--txt); font-weight:650}
.app-tab small{font-size:10.5px; line-height:1.3; text-align:center}
.app-tab:hover{border-color:var(--a)}
.app-tab.active{border-color:var(--a); background:rgba(76,141,255,.1)}
.app-tab.active b{color:var(--a)}
@media (max-width:380px){
  .app-tab small{display:none}
  .app-tab{flex-direction:row; gap:7px; padding:11px 8px}
}

main{
  flex:1; display:flex; flex-direction:column; min-height:0; gap:10px;
  max-width:960px; width:100%; margin:0 auto;
  /* chừa lề an toàn cho iPhone tai thỏ / thanh vuốt dưới đáy */
  padding:10px calc(12px + env(safe-area-inset-right)) calc(12px + env(safe-area-inset-bottom)) calc(12px + env(safe-area-inset-left));
}
.topbar{padding-top:calc(10px + env(safe-area-inset-top))}

/* ---------- Language bar ---------- */
.lang-bar{
  display:grid; grid-template-columns:1fr auto 1fr; gap:8px; align-items:end;
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:10px;
}
.lang-slot label{display:block; font-size:11px; color:var(--muted); margin-bottom:4px}
.lang-select{
  width:100%; min-height:44px; padding:11px 10px; border-radius:11px; border:1px solid var(--line);
  background:var(--bg-soft); color:var(--txt); font-size:15px; cursor:pointer;
}
.lang-arrow{color:var(--muted); padding-bottom:10px; font-size:18px}

/* ---------- Status ---------- */
.status{
  display:flex; align-items:center; gap:8px; font-size:12.5px; color:var(--muted);
  padding:6px 10px; border-radius:10px; background:var(--card); border:1px solid var(--line);
}
.status .dot{width:9px; height:9px; border-radius:50%; background:var(--muted); flex:none}
.status.listening{color:var(--a)} .status.listening .dot{background:var(--a); animation:pulse 1s infinite}
.status.working{color:var(--warn)} .status.working .dot{background:var(--warn); animation:pulse .7s infinite}
.status.error{color:var(--danger)} .status.error .dot{background:var(--danger)}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(1.35)}}

/* ---------- Conversation ---------- */
.convo{flex:1; min-height:0; overflow-y:auto; display:flex; flex-direction:column; gap:10px; padding:2px}
.empty{margin:auto; text-align:center; color:var(--muted); max-width:340px}
.empty .small{font-size:12.5px; line-height:1.6}

.bubble{
  max-width:88%; padding:11px 13px; border-radius:16px; border:1px solid var(--line);
  background:var(--card); animation:in .18s ease-out;
}
@keyframes in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.bubble.side-a{align-self:flex-start; border-left:3px solid var(--a)}
.bubble.side-b{align-self:flex-end; border-right:3px solid var(--b)}
.bubble .meta{display:flex; align-items:center; gap:6px; font-size:11px; color:var(--muted); margin-bottom:5px; flex-wrap:wrap}
.badge{
  background:var(--bg-soft); border:1px solid var(--line); border-radius:999px;
  padding:1px 7px; font-size:10.5px;
}
.badge.detect{border-color:var(--a); color:var(--a)}
.badge.ok{border-color:var(--b); color:var(--b)}
.badge.fix{border-color:var(--warn); color:var(--warn)}
.review-note{
  margin:8px 0 0; padding:7px 9px; font-size:12.5px; line-height:1.5;
  color:var(--warn); background:rgba(245,165,36,.09);
  border-left:2px solid var(--warn); border-radius:0 8px 8px 0;
}
.bubble .src{font-size:13px; color:var(--muted); margin:0 0 6px; line-height:1.45}
.bubble .dst{font-size:17px; font-weight:600; margin:0; line-height:1.45; word-wrap:break-word}
.bubble .tools{display:flex; gap:6px; margin-top:8px}
.bubble .tools button{
  background:transparent; border:1px solid var(--line); color:var(--muted);
  border-radius:8px; padding:3px 8px; font-size:12px; cursor:pointer;
}
.bubble .tools button:hover{color:var(--txt)}
.bubble.pending{opacity:.6}

/* ---------- Type bar ---------- */
.typebar{display:flex; gap:8px}
.typebar input{
  flex:1; min-height:46px; padding:12px 13px; border-radius:12px; border:1px solid var(--line);
  background:var(--card); color:var(--txt); font-size:16px;   /* 16px để iOS không tự phóng to khi gõ */
}
.typebar input:focus{outline:none; border-color:var(--a)}
.send-btn{
  width:48px; min-height:46px; border:none; border-radius:12px; background:var(--a); color:#fff;
  font-size:17px; cursor:pointer;
}

/* ---------- Mic bar ---------- */
.mic-bar{display:grid; grid-template-columns:1fr .8fr 1fr; gap:8px}
.mic-btn{
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:3px;
  padding:13px 6px; border-radius:16px; border:1px solid var(--line);
  background:var(--card); color:var(--txt); cursor:pointer; user-select:none;
  transition:transform .08s, background .15s;
}
.mic-btn:active{transform:scale(.97)}
.mic-ico{font-size:20px; line-height:1}
.mic-lbl{font-size:12px; color:var(--muted); text-align:center}
.mic-btn.side-a.active{background:var(--a); border-color:var(--a)}
.mic-btn.side-b.active{background:var(--b); border-color:var(--b)}
.mic-btn.auto.active{background:var(--warn); border-color:var(--warn)}
.mic-btn.active .mic-lbl{color:#fff}
.mic-btn:disabled{opacity:.4; cursor:not-allowed}

/* ---------- Settings sheet ---------- */
.sheet{position:fixed; inset:0; background:rgba(0,0,0,.5); display:flex; align-items:flex-end; justify-content:center; z-index:50}
.sheet[hidden]{display:none}   /* class selector thắng luật [hidden] mặc định của trình duyệt */
.sheet-inner{
  width:100%; max-width:520px; background:var(--bg-soft); border:1px solid var(--line);
  border-radius:18px 18px 0 0; padding:16px 16px 22px; max-height:86vh; overflow-y:auto;
}
.sheet-head{display:flex; align-items:center; justify-content:space-between; margin-bottom:12px}
.sheet-head h2{font-size:16px; margin:0}
.row-toggle{display:flex; align-items:center; justify-content:space-between; padding:11px 0; border-bottom:1px solid var(--line); font-size:14px}
.row-toggle input{width:20px; height:20px; accent-color:var(--a)}
.row-field{display:block; padding:11px 0; border-bottom:1px solid var(--line); font-size:14px}
.row-field > span{display:block; margin-bottom:7px}
.field{
  width:100%; padding:9px 10px; border-radius:10px; border:1px solid var(--line);
  background:var(--card); color:var(--txt); font-size:13.5px;
}
.field-row{display:flex; gap:6px}
.try-btn{
  flex:none; width:42px; border-radius:10px; border:1px solid var(--line);
  background:var(--card); color:var(--txt); font-size:13px; cursor:pointer;
}
.sheet-sub{font-size:13px; color:var(--muted); margin:18px 0 2px; font-weight:600; text-transform:uppercase; letter-spacing:.04em}
.row-range{display:block; padding:11px 0; border-bottom:1px solid var(--line); font-size:14px}
.row-range input{width:100%; margin-top:8px; accent-color:var(--a)}
.hint{font-size:11.5px; color:var(--muted); margin:6px 0 0; line-height:1.55}
.hint.small{margin-top:14px}
.hint code{background:var(--card); padding:1px 5px; border-radius:5px}
.sheet-actions{display:flex; gap:8px; margin-top:16px}
.ghost-btn{
  flex:1; padding:10px; border-radius:10px; border:1px solid var(--line);
  background:var(--card); color:var(--txt); font-size:13px; cursor:pointer;
}
.ghost-btn.danger{color:var(--danger); border-color:var(--danger)}
.ghost-btn.wide{width:100%; margin-top:14px; padding:12px; font-size:14px}

/* Biên bản cuộc gặp */
.minutes{font-size:14px; line-height:1.65}
.minutes h3{font-size:17px; margin:0 0 4px}
.minutes h4{font-size:13px; margin:16px 0 6px; color:var(--muted); text-transform:uppercase; letter-spacing:.04em}
.minutes .minutes-meta{font-size:11.5px; color:var(--muted); margin:0 0 12px}
.minutes p{margin:0 0 10px}
.minutes ul{margin:0; padding-left:20px}
.minutes li{margin-bottom:5px}

@media (max-width:520px){
  .bubble{max-width:94%}
  .bubble .dst{font-size:16px}
}

/* Điện thoại nhỏ và màn thấp: thu gọn để mọi nút vẫn nằm trong một màn hình */
@media (max-height:680px){
  .topbar{padding-top:calc(6px + env(safe-area-inset-top)); padding-bottom:6px}
  .topbar p{display:none}
  .lang-bar{padding:8px}
  .mic-btn{padding:11px 6px}
  .mic-ico{font-size:18px}
  main{gap:8px}
}
@media (max-width:360px){
  .topbar h1{font-size:15px}
  .mic-lbl{font-size:11px}
}

/* Thuoc tinh hidden phai thang moi class co display — neu khong, cac khoi
   duoc lenh an van hien ra va chiem cho (loi da gap voi luoi chon tranh,
   khung goi y, nut micro, nut on tu kho). */
[hidden]{display:none !important}