:root{
  --bg: #f3f6fb;
  --card: #ffffff;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e6eefc;
}

body {
  font-family: Inter, Arial, sans-serif;
  background: var(--bg);
  margin: 0;
  padding: 18px;
  color: #0b1220;
}

/* dark mode */
body.dark {
  --bg: #0b1220;
  --card: #0f1724;
  --muted: #9aa6b2;
  --accent: #82aaff;
  --border: #1e293b;
  color: #dbeafe;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:14px;
}

h1{ margin:0; font-size:20px; color:var(--accent); }

/* layout */
.main{
  display:flex;
  gap:18px;
  align-items:flex-start;
}

/* cards */
.card{
  background:var(--card);
  border:1px solid var(--border);
  padding:14px;
  border-radius:10px;
  box-shadow: 0 4px 18px rgba(15,23,42,0.06);
}

.controls{
  width:360px;
}

.output{
  flex:1;
  min-height:200px;
}

/* controls */
select, textarea {
  width:100%;
  padding:10px;
  margin-top:8px;
  border-radius:6px;
  border:1px solid var(--border);
  background: transparent;
  color: inherit;
  box-sizing:border-box;
}

.row{ display:flex; gap:8px; margin-top:8px; }
.row button, .small-btn{
  padding:8px 10px;
  border-radius:6px;
  border:none;
  background:var(--accent);
  color:white;
  cursor:pointer;
}

#submitBtn{
  margin-top:12px;
  width:100%;
  padding:10px;
  border-radius:8px;
  background:var(--accent);
  color:white;
  border:none;
  cursor:pointer;
}

/* article cards */
.article-card{
  border:1px solid var(--border);
  border-radius:8px;
  padding:10px;
  margin-bottom:14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.7), rgba(255,255,255,0.5));
}

body.dark .article-card{
  background: linear-gradient(180deg, rgba(16,24,40,0.6), rgba(12,18,30,0.35));
  border:1px solid var(--border);
}

.article-title{ font-weight:700; color:var(--accent); margin-bottom:6px; }
.article-url a{ color:var(--accent); font-size:13px; text-decoration:none; }
.article-summary{ margin-top:8px; color:var(--muted); font-size:13px; }
.article-text{ margin-top:10px; max-height:140px; overflow:auto; background:transparent; padding:8px; border-radius:6px; border:1px dashed var(--border); }
.article-stats{ margin-top:8px; color:var(--muted); font-size:13px; }

/* duplicates */
.dup-card{ padding:10px; border-radius:8px; background:rgba(37,99,235,0.06); margin-bottom:10px; }

/* compare */
.compare-box{
  background:var(--card);
  border:1px solid var(--border);
  padding:12px;
  max-height:360px;
  overflow:auto;
  border-radius:6px;
}
.changed{
  background: rgba(255,107,107,0.12);
  border-left: 4px solid #ff6b6b;
  padding:8px;
  margin:6px 0;
  border-radius:4px;
  color: #7f1d1d;
}

.notice { color: #b45309; margin-top:8px; }

/* small responsive tweak */
@media (max-width: 880px){
  .main{ flex-direction: column; }
  .controls{ width:100%; }
}