/* The luyen noi - Engbatho */
:root{
  --bg:#edf0f3; --surface:#ffffff; --surface2:#f6f8fa; --ink:#15202b; --muted:#5a6776; --line:#d3dae2;
  --accent:#0e6f68; --accent-ink:#ffffff; --accent-soft:#dcefed;
  --stress:#b45309; --stress-soft:#fdf0dd;
  --ok:#15803d; --ok-soft:#e1f3e6; --bad:#b91c1c; --bad-soft:#fbe4e4;
  --shadow:0 1px 2px rgba(21,32,43,.06),0 4px 16px rgba(21,32,43,.06);
  --f-ui:"Be Vietnam Pro","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
  --f-en:"Literata","Georgia","Cambria","Times New Roman",serif;
  --f-ipa:"Noto Sans","Segoe UI","Lucida Sans Unicode","Arial Unicode MS",sans-serif;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0f151b; --surface:#17212b; --surface2:#1c2833; --ink:#e5ebf0; --muted:#95a3b1; --line:#2b3845;
    --accent:#2cc4b5; --accent-ink:#06201d; --accent-soft:#163a37;
    --stress:#f5b74a; --stress-soft:#3a2c14;
    --ok:#4ade80; --ok-soft:#143322; --bad:#f87171; --bad-soft:#3b1a1a;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 16px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0f151b; --surface:#17212b; --surface2:#1c2833; --ink:#e5ebf0; --muted:#95a3b1; --line:#2b3845;
  --accent:#2cc4b5; --accent-ink:#06201d; --accent-soft:#163a37;
  --stress:#f5b74a; --stress-soft:#3a2c14;
  --ok:#4ade80; --ok-soft:#143322; --bad:#f87171; --bad-soft:#3b1a1a;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 16px rgba(0,0,0,.25);
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:15px/1.5 var(--f-ui);-webkit-text-size-adjust:100%}
button,select,input{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}

.wrap{max-width:1080px;margin:0 auto;padding-inline:16px;padding-block:0 40px}

/* top bar */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--bg);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding-block:10px}
.brand{display:flex;align-items:baseline;gap:8px;margin-right:auto}
.brand b{font-size:17px;letter-spacing:.01em}
.brand span{color:var(--muted);font-size:13px}
.tabs{display:flex;gap:4px;background:var(--surface2);border:1px solid var(--line);border-radius:10px;padding:3px}
.tabs button{border:0;background:transparent;padding:6px 12px;border-radius:7px;font-size:14px;color:var(--muted)}
.tabs button[aria-selected="true"]{background:var(--surface);color:var(--ink);font-weight:600;box-shadow:var(--shadow)}

/* day header */
.dayhead{display:flex;align-items:flex-end;gap:16px;flex-wrap:wrap;margin:20px 0 14px}
.daynum{font:700 44px/1 var(--f-ui);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.daynum small{font-size:15px;color:var(--muted);font-weight:500;letter-spacing:0}
.daymeta{flex:1;min-width:220px}
.eyebrow{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.topic{font-size:19px;font-weight:600;margin:2px 0 0;text-wrap:balance}
.topic em{font-weight:400;color:var(--muted);font-style:italic;font-size:15px}
.daynav{display:flex;gap:6px}

.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--surface);border-radius:9px;padding:8px 12px;font-size:14px;line-height:1.2}
.btn:hover{border-color:var(--muted)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}
.btn.rec{border-color:var(--bad);color:var(--bad)}
.btn.live{background:var(--bad);border-color:var(--bad);color:#fff;animation:pulse 1.2s infinite}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn kbd{font:11px var(--f-ui);border:1px solid currentColor;border-radius:4px;padding:0 4px;opacity:.55}
@keyframes pulse{50%{opacity:.7}}
@media (prefers-reduced-motion:reduce){.btn.live{animation:none}}

/* layout */
.grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px;align-items:start}
@media (max-width:820px){.grid{grid-template-columns:minmax(0,1fr)}}

.modebar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--surface)}
.seg button{border:0;background:transparent;padding:7px 12px;font-size:14px;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--accent-soft);color:var(--ink);font-weight:600}
.dots{display:flex;gap:6px;margin-left:auto}
.dots button{width:30px;height:30px;border-radius:50%;border:1px solid var(--line);background:var(--surface);font-size:13px;font-variant-numeric:tabular-nums}
.dots button.cur{border:2px solid var(--accent);font-weight:700}
.dots button.full{background:var(--accent-soft)}

/* sentence card */
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:22px 22px 18px}
.card .idx{font-size:12px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;display:flex;justify-content:space-between;gap:8px}
.en{font:400 clamp(22px,3.4vw,30px)/1.45 var(--f-en);margin:10px 0 8px;text-wrap:pretty}
.en .st{font-weight:700;text-decoration:underline;text-decoration-color:var(--stress);text-decoration-thickness:2px;text-underline-offset:5px;color:var(--ink)}
.en .w.ok{color:var(--ok)}
.en .w.miss{color:var(--bad);background:var(--bad-soft);border-radius:4px}
.en.hide{color:transparent;user-select:none;background:repeating-linear-gradient(90deg,var(--surface2) 0 14px,transparent 14px 18px);border-radius:6px}
.en.hide .st{text-decoration-color:transparent;color:transparent}
.ipa{font:15px/1.6 var(--f-ipa);color:var(--muted);margin:0 0 6px;word-break:break-word}
.vi{font-size:16px;font-style:italic;margin:6px 0 0;color:var(--ink)}
.card.rev .vi{font-size:clamp(20px,3vw,25px);font-style:normal;font-weight:500;margin:6px 0 14px}
.prompt{font-size:13px;color:var(--muted);margin:0}

.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.result{margin-top:12px;border-radius:10px;padding:10px 12px;background:var(--surface2);font-size:14px}
.result .score{font:700 22px/1 var(--f-ui);font-variant-numeric:tabular-nums;margin-right:8px}
.result.good .score{color:var(--ok)} .result.fair .score{color:var(--stress)} .result.poor .score{color:var(--bad)}
.result .heard{color:var(--muted);margin-top:4px}

.ticks{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}
.boxes{display:flex;gap:5px}
.boxes i{width:22px;height:22px;border:2px solid var(--line);border-radius:5px;display:grid;place-items:center;font-style:normal;font-size:13px;color:var(--accent-ink)}
.boxes i.on{background:var(--accent);border-color:var(--accent)}
.ticks span{font-size:13px;color:var(--muted)}

.foot{display:flex;justify-content:space-between;gap:8px;margin-top:12px;flex-wrap:wrap}

/* side panel */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px}
.panel h3{margin:0 0 8px;font-size:14px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted)}
.panel + .panel{margin-top:14px}
.list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.list button{width:100%;text-align:left;border:1px solid var(--line);background:var(--surface2);border-radius:9px;padding:8px 10px;display:flex;gap:10px;align-items:center}
.list button:hover{border-color:var(--accent)}
.list .n{font-weight:700;font-variant-numeric:tabular-nums;min-width:26px}
.list .t{flex:1;font-size:13px;line-height:1.3}
.list .tag{font-size:11px;color:var(--muted)}
.note{font-size:13px;color:var(--muted);margin:8px 0 0}
.steps{margin:0;padding-left:18px;font-size:13px;color:var(--ink)}
.steps li{margin-bottom:4px}

/* review + progress */
.section-title{font-size:20px;margin:22px 0 4px}
.sub{color:var(--muted);margin:0 0 14px}
.weeks{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.cal{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px}
@media (max-width:560px){.cal{grid-template-columns:repeat(3,minmax(0,1fr))}}
.cell{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:8px;text-align:left;min-height:84px;display:flex;flex-direction:column;gap:4px}
.cell .n{font-weight:700;font-variant-numeric:tabular-nums}
.cell .t{font-size:12px;line-height:1.3;color:var(--muted);flex:1}
.cell .bar{height:4px;border-radius:2px;background:var(--surface2);overflow:hidden}
.cell .bar b{display:block;height:100%;background:var(--accent)}
.cell.done{border-color:var(--accent);background:var(--accent-soft)}
.cell.cur{outline:2px solid var(--stress);outline-offset:1px}
.weeklabel{grid-column:1/-1;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:8px}
.stats{display:flex;gap:12px;flex-wrap:wrap;margin:6px 0 16px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px 14px;min-width:130px}
.stat b{display:block;font-size:24px;font-variant-numeric:tabular-nums}
.stat span{font-size:12px;color:var(--muted)}
.settings{display:grid;gap:12px;max-width:560px}
.settings label{display:grid;gap:4px;font-size:14px}
.settings select,.settings input[type=range]{width:100%}
.settings select{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:6px}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.warn{background:var(--stress-soft);border:1px solid var(--stress);border-radius:10px;padding:10px 12px;font-size:14px;margin:0 0 12px}

.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:10px;font-size:14px;z-index:20;max-width:calc(100% - 32px)}
@media (hover:none){.btn kbd{display:none}}