:root{
  --bg:#ecece6; --panel:#f6f6f2; --ink:#1d1f1e; --ink-2:#5c605e; --line:#c9cbc4;
  --pivot:#b0301f; --accent:#1f4e5a; --accent-ink:#f6f6f2; --track:#d7d9d2; --scrim:rgba(20,22,24,.45);
  --serif:"IBM Plex Serif",Georgia,"Times New Roman",serif;
  --sans:"IBM Plex Sans",-apple-system,"Segoe UI",Helvetica,Arial,sans-serif;
  --sat:env(safe-area-inset-top,0px); --sab:env(safe-area-inset-bottom,0px);
  --word-size:2.4rem;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#1b1d1f; --panel:#242729; --ink:#e9eae5; --ink-2:#9a9f9b; --line:#3a3e40;
    --pivot:#e8604c; --accent:#7fb8c6; --accent-ink:#141618; --track:#33373a; --scrim:rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  --bg:#1b1d1f; --panel:#242729; --ink:#e9eae5; --ink-2:#9a9f9b; --line:#3a3e40;
  --pivot:#e8604c; --accent:#7fb8c6; --accent-ink:#141618; --track:#33373a; --scrim:rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.5;-webkit-text-size-adjust:100%}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:1px solid var(--line);border-radius:8px;padding:.6rem .9rem;min-height:44px}
button:hover{border-color:var(--ink-2)}
button:focus-visible,input:focus-visible,textarea:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:500}
button:disabled{opacity:.4;cursor:default}
button.icon{width:44px;padding:0;display:grid;place-items:center;border:none}
button.icon svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* app shell: one view visible at a time */
.view{display:none;flex-direction:column;min-height:100%;padding-top:var(--sat)}
.view.active{display:flex}
.topbar{display:flex;align-items:center;gap:.5rem;padding:.4rem .5rem;min-height:56px;border-bottom:1px solid var(--line)}
.topbar-spacer{width:44px;flex:none}
.topbar h1{font-family:var(--serif);font-weight:500;font-size:1.15rem;margin:0;flex:1;text-align:center}
.topbar .mid{flex:1;text-align:center;color:var(--ink-2);font-size:.9rem;font-variant-numeric:tabular-nums}
.body{flex:1;display:flex;flex-direction:column;padding:1rem;gap:.75rem;width:100%;max-width:44rem;margin:0 auto}
.bottom{position:sticky;bottom:0;background:var(--bg);border-top:1px solid var(--line);padding:.75rem 1rem calc(.75rem + var(--sab))}
.bottom .inner{max-width:44rem;margin:0 auto;display:flex;gap:.6rem;align-items:center;justify-content:center}
.bottom .primary{flex:1;max-width:22rem;min-height:52px;font-size:1.05rem}

/* text page */
textarea{width:100%;flex:1;min-height:12rem;resize:none;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:.9rem;line-height:1.55;font-family:var(--serif);font-size:1rem}
.row{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.row .grow{flex:1}
input[type=url]{flex:1;min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:.6rem .8rem;min-height:44px}
.status{margin:0;color:var(--ink-2);font-size:.9rem;min-height:1.3em}
.status.err{color:var(--pivot)}

.tabs{display:flex;border-bottom:1px solid var(--line);padding:0 .5rem}
.tab{flex:1;border:none;border-radius:0;border-bottom:2px solid transparent;margin-bottom:-1px;color:var(--ink-2);padding:.75rem .25rem;font-weight:500}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--pivot)}
.pane{display:none;flex-direction:column;gap:.75rem;flex:1}
.pane.active{display:flex}
.drop{border:1px dashed var(--line);border-radius:10px;padding:1.5rem 1rem;text-align:center;background:var(--panel);display:flex;flex-direction:column;align-items:center;gap:.6rem}
.drop.over{border-color:var(--accent);border-style:solid}
.drop p{margin:0;color:var(--ink-2);font-size:.9rem;max-width:26rem}
.drop .hint{font-size:.85rem}
.preview{border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:.8rem 1rem}
.preview .pv{font-family:var(--serif);color:var(--ink-2);font-size:.95rem;line-height:1.5;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden;margin:0 0 .6rem}
.preview button{min-height:36px;padding:.3rem .7rem;font-size:.9rem}
.body > .note{margin:0;color:var(--ink-2);font-size:.9rem;text-align:center;min-height:1.3em}

/* reading page */
.stage{flex:1;display:flex;flex-direction:column;justify-content:center;position:relative;min-height:40vh}
.flash{position:relative;padding:2.2rem 1rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden}
.flash::before,.flash::after{content:"";position:absolute;left:50%;width:1px;height:.8rem;background:var(--pivot);transform:translateX(-50%)}
.flash::before{top:0}.flash::after{bottom:0}
.word{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:baseline;width:100%;max-width:100%;font-family:var(--serif);font-size:var(--word-size);line-height:1.15;white-space:nowrap;font-variant-numeric:lining-nums}
.word .l{text-align:right;min-width:0}
.word .p{color:var(--pivot)}
.word .r{text-align:left;min-width:0}
.progress{height:4px;background:var(--track);border-radius:2px;overflow:hidden}
.progress > div{height:100%;width:0;background:var(--accent);transition:width .12s linear}
.meta{display:flex;justify-content:space-between;color:var(--ink-2);font-size:.85rem;font-variant-numeric:tabular-nums}
.done{display:none;padding:1rem 1.1rem;background:var(--panel);border:1px solid var(--line);border-radius:10px}
.done.show{display:block}
.done h2{font-family:var(--serif);font-weight:500;font-size:1.1rem;margin:0 0 .35rem}
.done p{margin:.25rem 0;color:var(--ink-2)}
.done .full{display:none;margin-top:1rem;font-family:var(--serif);line-height:1.65;white-space:pre-wrap;color:var(--ink)}
.done.reveal .full{display:block}
.skip{min-width:64px;font-variant-numeric:tabular-nums}

/* settings sheet */
.scrim{position:fixed;inset:0;background:var(--scrim);display:none;z-index:9}
.scrim.open{display:block}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:10;background:var(--panel);border-top:1px solid var(--line);border-radius:16px 16px 0 0;padding:.5rem 1.25rem calc(1.25rem + var(--sab));transform:translateY(105%);transition:transform .22s ease;max-height:85vh;overflow:auto}
.sheet.open{transform:none}
.sheet .grab{width:2.5rem;height:4px;border-radius:2px;background:var(--line);margin:.25rem auto .9rem}
.sheet header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.5rem}
.sheet h2{font-family:var(--serif);font-weight:500;font-size:1.15rem;margin:0}
.setting{padding:.9rem 0;border-top:1px solid var(--line)}
.setting:first-of-type{border-top:none}
.setting .head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:.5rem}
.setting .head label{font-weight:500}
.setting .head .val{color:var(--ink-2);font-variant-numeric:tabular-nums}
.setting .desc{color:var(--ink-2);font-size:.85rem;margin:.35rem 0 0}
.setting .install-btn{width:100%}
.stepper{display:flex;align-items:center;gap:.5rem}
.stepper input[type=range]{flex:1;accent-color:var(--accent);min-height:44px}
.stepper button{width:44px;padding:0}
.chips{display:flex;gap:.5rem}
.chip{flex:1;border-radius:8px}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.switch{display:flex;justify-content:space-between;align-items:center;width:100%;text-align:left;border:none;padding:0;min-height:44px}
.switch .knob{width:46px;height:28px;border-radius:14px;background:var(--track);position:relative;flex:none;transition:background .15s}
.switch .knob::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:#fff;transition:transform .15s;box-shadow:0 1px 2px rgba(0,0,0,.25)}
.switch[aria-checked="true"] .knob{background:var(--accent)}
.switch[aria-checked="true"] .knob::after{transform:translateX(18px)}
.keys{color:var(--ink-2);font-size:.85rem;margin:.75rem 0 0;display:none;text-align:center}
kbd{border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;padding:0 .35rem;font-size:.8rem}

@media (min-width:720px){
  :root{--word-size:3.2rem}
  .sheet{left:auto;top:0;bottom:0;width:22rem;border-radius:0;border-top:none;border-left:1px solid var(--line);transform:translateX(105%);max-height:none;padding-top:1rem}
  .sheet .grab{display:none}
  .keys{display:block}
}
@media (prefers-reduced-motion:reduce){ .progress > div,.sheet,.switch .knob,.switch .knob::after{transition:none} }