/* Minimal, framework-free. Light/dark via prefers-color-scheme; single column, mobile-friendly. */
:root {
  --bg: #f7f7f5;
  --fg: #1c1c1c;
  --muted: #6b6b6b;
  --card: #ffffff;
  --border: #dcdcd7;
  --accent: #2f6f4f;
  --accent-soft: #e7f2ec;
  --error: #b3382e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a;
    --fg: #e6e4df;
    --muted: #9a9a94;
    --card: #1f2225;
    --border: #33373b;
    --accent: #6fbf94;
    --accent-soft: #22322a;
    --error: #e07a70;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); }
button, input, select {
  font: inherit;
  color: var(--fg);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
}
button { cursor: pointer; }
button:hover { border-color: var(--accent); }
button.ghost { background: transparent; }
button.active { background: var(--accent); color: var(--bg); border-color: var(--accent); }

/* top bar */
.topbar {
  position: sticky; top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 10px 14px 6px;
}
.topbar-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.brand { font-weight: 700; color: var(--accent); margin-right: 4px; }
#search-form { display: flex; gap: 6px; flex: 1 1 240px; min-width: 200px; }
#search-q { flex: 1; min-width: 100px; }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 0 6px; }
.tabs button { padding: 4px 12px; border-radius: 999px; }

/* main + cards */
main { max-width: 780px; margin: 0 auto; padding: 14px; }
.status { color: var(--muted); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 14px;
}
.card-title { font-size: 1.1rem; margin: 0 0 4px; }
.card-title a { text-decoration: none; }
.card-title a:hover { text-decoration: underline; }
.meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 6px; }
.authors { color: var(--muted); font-size: 0.9rem; margin: 0 0 8px; }
.summary {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 8px 12px;
  margin: 8px 0;
}
.summary-label {
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.abstract summary { cursor: pointer; color: var(--muted); }
.abstract p { margin: 8px 0 0; }
.actions { display: flex; gap: 8px; margin-top: 10px; align-items: center; }
.btn-link {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  text-decoration: none;
}
.review-out {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  margin-top: 10px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.8rem;
  overflow-x: auto;
}
.error { color: var(--error); }

/* login */
.login-body { display: flex; min-height: 100vh; align-items: center; justify-content: center; }
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  width: min(360px, 92vw);
}
.login-card h1 { font-size: 1.15rem; margin: 0 0 16px; color: var(--accent); }
.login-card form { display: flex; flex-direction: column; gap: 8px; }
.login-card label { font-size: 0.85rem; color: var(--muted); }
.login-card button { margin-top: 8px; background: var(--accent); color: var(--bg); border-color: var(--accent); }

@media (max-width: 560px) {
  .topbar-row { gap: 6px; }
  #search-form { order: 3; flex-basis: 100%; }
}