:root{
  --bg:#0b1220;
  --bg2:#0f1a33;
  --card:#0f172a;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --primary:#7aa2ff;
  --border:#24314e;
  --radius:16px;
  --tap:44px;
}

/* Light theme */
html[data-theme="light"]{
  --bg:#f7f8fb;
  --bg2:#f3f5ff;
  --card:#ffffff;
  --text:#1f2937;
  --muted:#6b7280;
  --primary:#6b8cff;
  --border:#e5e7eb;
}

*{box-sizing:border-box}

body{
  margin:0;
  min-height:100vh;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;
  background:linear-gradient(180deg,var(--bg2),var(--bg));
  color:var(--text);
}

.container{
  max-width:980px;
  margin:0 auto;
  padding:18px;
}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:22px;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
}

.logoWrap{
  width:56px;
  height:56px;
  border-radius:16px;
  background:radial-gradient(circle at 30% 30%, #fff6d1, #ffd166);
  display:grid;
  place-items:center;
  flex-shrink:0;
}

.brand h1{
  margin:0;
  font-size:22px;
  font-weight:800;
}

.brand p{
  margin:6px 0 0;
  font-size:13px;
  color:var(--muted);
}

/* Toggle */
.toggle{
  display:flex;
  align-items:center;
  gap:10px;
  cursor:pointer;
}

.switch{
  width:50px;
  height:28px;
  border-radius:999px;
  background:rgba(148,163,184,0.25);
  position:relative;
}

.switch::after{
  content:"";
  width:22px;
  height:22px;
  border-radius:50%;
  background:var(--card);
  position:absolute;
  top:3px;
  left:3px;
  transition:left .2s ease;
}

html[data-theme="dark"] .switch::after{ left:25px; }

label{
  font-size:13px;
  font-weight:700;
  color:var(--muted);
}

select, textarea, button, input[type="range"]{
  font-size:15px;
}

select, textarea{
  width:100%;
  border-radius:12px;
  border:1px solid var(--border);
  background:transparent;
  color:var(--text);
}

select{
  height:var(--tap);
  padding:0 12px;
}

textarea{
  min-height:240px;
  padding:14px;
  line-height:1.6;
  resize:vertical;
  overflow:hidden;
}

.controls{
  display:flex;
  gap:10px;
  margin-top:12px;
}

.btn{
  height:var(--tap);
  padding:0 14px;
  border-radius:12px;
  border:1px solid var(--border);
  background:transparent;
  font-weight:800;
  cursor:pointer;
}

.btn.primary{
  background:var(--primary);
  color:#fff;
  border:none;
}

.slider{
  margin-top:12px;
}

.slider label{
  display:flex;
  justify-content:space-between;
}

#progress{
  width:100%;
  margin-top:14px;
}

#reader{
  margin-top:18px;
  padding:12px;
  border-radius:12px;
  border:1px dashed var(--border);
  display:none;
}

.chunk{
  display:block;
  padding:6px 8px;
  border-radius:8px;
}

.chunk.active{
  background:rgba(122,162,255,0.18);
  border-left:4px solid var(--primary);
  padding-left:12px;
}

footer{
  margin-top:26px;
  text-align:center;
  font-size:13px;
  color:var(--muted);
}

footer a{
  color:inherit;
  font-weight:800;
  text-decoration:none;
}

/* Fix select dropdown readability in dark mode */
select {
  background-color: var(--card);
  color: var(--text);
}

select option {
  background-color: var(--card);
  color: var(--text);
}

select:focus option:checked {
  background-color: var(--primary);
  color: #fff;
}