:root {
  --paper: #fbf9f4;
  --card: #ffffff;
  --ink: #1c2733;
  --ink-soft: #5b6b7c;
  --line: #e4ded2;
  --blue: #1f4e79;
  --blue-soft: #eaf1f8;
  --gold: #a9772a;
  --gold-soft: #fbf2e0;
  --green: #2f6b4f;
  --green-soft: #e9f3ee;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system,
    "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 56px;
}

.brand {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

h1 {
  margin: 0;
  font-size: 27px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.sub {
  margin: 8px 0 26px;
  color: var(--ink-soft);
  font-size: 14px;
}

.searchbox {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(28, 39, 51, 0.05);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.searchbox:focus-within {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(31, 78, 121, 0.1);
}

#q {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 15px 16px;
  font-size: 17px;
  color: var(--ink);
  font-family: inherit;
}

#q::placeholder { color: #9aa7b4; }

#clear {
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: 13px;
  padding: 8px 14px;
  cursor: pointer;
  font-family: inherit;
  display: none;
}

#clear:hover { color: var(--blue); }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 4px;
}

.chip {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.12s ease;
}

.chip:hover { border-color: var(--blue); color: var(--blue); }

.chip[aria-pressed="true"] {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.status {
  margin: 14px 2px 10px;
  font-size: 13px;
  color: var(--ink-soft);
  min-height: 18px;
}

.results {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
}

.results:empty { display: none; }

.row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}

.row:last-child { border-bottom: 0; }

.row[aria-selected="true"] {
  background: var(--blue-soft);
  box-shadow: inset 3px 0 0 var(--blue);
}

.title {
  flex: 1;
  font-size: 15px;
  line-height: 1.45;
  word-break: break-word;
}

.title mark {
  background: #fff2b8;
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}

.issn {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--ink-soft);
  white-space: nowrap;
}

.badge {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid transparent;
}

.badge.lv-top { background: var(--gold-soft); color: var(--gold); border-color: #f0dfbd; }
.badge.lv-1 { background: var(--blue-soft); color: var(--blue); border-color: #d5e3f0; }
.badge.lv-2 { background: var(--green-soft); color: var(--green); border-color: #d3e6dc; }
.badge.lv-3 { background: #f1f1ee; color: var(--ink-soft); border-color: #e2e2dc; }

.hint {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 20px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.9;
}

.hint code {
  background: var(--blue-soft);
  color: var(--blue);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 13px;
  cursor: pointer;
}

.pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-soft);
}

.pager[hidden] { display: none; }

.page-btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink-soft);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.12s ease;
}

.page-btn:hover:not(:disabled) { border-color: var(--blue); color: var(--blue); }

.page-btn:disabled { opacity: 0.4; cursor: default; }

.page-jump {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin: 0 2px;
}

.page-input {
  width: 4.5em;
  padding: 5px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  font-family: inherit;
  font-size: 13px;
  text-align: center;
}

.page-input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(31, 78, 121, 0.1);
}

footer {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12.5px;
  line-height: 1.8;
}

#toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translate(-50%, 12px);
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  padding: 9px 16px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

#toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 560px) {
  .wrap { padding: 22px 14px 40px; }
  h1 { font-size: 22px; }
  .row { flex-wrap: wrap; gap: 6px 12px; }
  .title { flex: 1 1 100%; }
}