/* BibScorer：黑白极简，巨型步骤数字 */
:root {
  --ink: #000;
  --paper: #fff;
  --ui: Optima, Candara, "Segoe UI", system-ui, sans-serif;
  --text: Baskerville, "Libre Baskerville", Georgia, serif;
  --mono: ui-monospace, Menlo, Consolas, monospace;
  --rule: 4px solid var(--ink);
  --hair: 1px solid var(--ink);
  --width: 760px;
}

* { box-sizing: border-box; }
html { color-scheme: light; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-underline-offset: 3px; }
code { font-family: var(--mono); font-size: 0.88em; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }

.container { max-width: var(--width); margin: 0 auto; padding: 0 20px; }

/* --- 页头 / 页脚 --- */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 28px 0 12px;
  border-bottom: var(--rule);
}
.brand { font-weight: bold; font-size: 44px; line-height: 1; letter-spacing: -0.01em; text-decoration: none; }
.tagline { font-size: 14px; }

.site-footer {
  margin-top: 64px;
  padding: 16px 0 40px;
  border-top: var(--rule);
  font-size: 14px;
  text-align: center;
}

/* --- 错误提示 --- */
.error {
  margin: 24px 0 0;
  padding: 14px 16px;
  background: var(--ink);
  color: var(--paper);
  font-weight: bold;
}

/* --- 步骤 --- */
.step {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  padding: 24px 0;
  border-bottom: var(--rule);
}
.step-action { align-items: center; border-bottom: none; }
.num { font-weight: bold; font-size: 76px; line-height: 0.8; }

.label { display: block; font-weight: bold; margin-bottom: 8px; }
.optional {
  margin-left: 6px;
  padding: 0 6px;
  border: var(--hair);
  font-size: 13px;
  font-weight: normal;
  vertical-align: 2px;
}
.note { margin: 8px 0 0; font-size: 15px; }

textarea, select, input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
}
textarea { resize: vertical; }
textarea::placeholder { color: #555; }

input[type="file"] { width: 100%; font: inherit; }
input[type="file"]::file-selector-button {
  margin-right: 12px;
  padding: 8px 14px;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-weight: bold;
  cursor: pointer;
}
input[type="file"]::file-selector-button:hover { background: var(--ink); color: var(--paper); }

details.advanced { margin-top: 16px; }
details.advanced > summary {
  cursor: pointer;
  font-weight: bold;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.multipliers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.multipliers label { display: block; font-size: 15px; margin-bottom: 4px; }

.inline { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
.inline label { font-weight: bold; white-space: nowrap; }
.inline select { width: auto; max-width: 100%; }

/* --- 按钮 --- */
button {
  border: 2px solid var(--ink);
  border-radius: 0;
  font: inherit;
  font-weight: bold;
  cursor: pointer;
}
.btn-primary {
  width: 100%;
  padding: 18px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 21px;
  text-align: left;
}
.btn-primary:hover { background: var(--paper); color: var(--ink); }
.btn-primary:disabled { cursor: progress; background: var(--paper); color: var(--ink); }
.btn-secondary { padding: 12px 18px; background: var(--paper); color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--paper); }

/* --- 排名结果 --- */
.results, .export { margin-top: 40px; }
.results { margin-top: 72px; }

/* 通栏黑色分界带：用阴影延伸到整个屏幕宽度，clip-path 防止出现横向滚动条 */
.results-band {
  padding: 36px 0 28px;
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 0 0 100vmax var(--ink);
  clip-path: inset(0 -100vmax);
}
.band-kicker { margin: 0; font-size: 14px; letter-spacing: 0.12em; text-transform: uppercase; }
.band-title { margin: 6px 0 14px; font-size: 64px; line-height: 0.95; }
.band-stats { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 0; font-size: 16px; }
.band-stats a { font-weight: bold; }
.results-band :focus-visible { outline-color: var(--paper); }
.results > .note { margin-top: 16px; }
.section-title {
  margin: 0;
  padding-top: 20px;
  border-top: var(--rule);
  font-size: 36px;
  line-height: 1.1;
}

.ranking { list-style: none; margin: 16px 0 0; padding: 0; }
.entry {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-top: var(--hair);
}
.rank { display: block; font-size: 13px; }
.score strong { display: block; font-size: 44px; line-height: 1; }
.sim { display: block; margin-top: 6px; font-size: 13px; }

.title { font-family: var(--text); font-size: 20px; line-height: 1.3; }
summary.title { cursor: pointer; list-style: none; }
summary.title::-webkit-details-marker { display: none; }
summary.title::after { content: " +"; font-family: var(--ui); font-weight: bold; }
details[open] > summary.title::after { content: " −"; }
.abstract { margin: 10px 0 0; font-family: var(--text); font-size: 17px; line-height: 1.6; }
.meta { margin-top: 6px; font-size: 14px; }

mark { background: var(--ink); color: var(--paper); padding: 0 0.12em; }

/* --- 导出 --- */
.fields { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 16px 0 20px; }
.fields label { display: flex; align-items: center; gap: 8px; font-size: 15px; }
input[type="checkbox"] { width: 18px; height: 18px; margin: 0; accent-color: var(--ink); }

/* --- 手机 --- */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .brand { font-size: 34px; }
  .step { grid-template-columns: 44px minmax(0, 1fr); gap: 12px; }
  .num { font-size: 48px; }
  .multipliers { grid-template-columns: 1fr; }
  .entry { grid-template-columns: 64px minmax(0, 1fr); gap: 12px; }
  .score strong { font-size: 32px; }
  .title { font-size: 18px; }
  .section-title { font-size: 28px; }
  .results { margin-top: 56px; }
  .band-title { font-size: 44px; }
  .btn-primary { font-size: 19px; }
}

/* --- 导出选项 --- */
.export-group { margin: 20px 0 0; padding: 0; border: 0; min-width: 0; }
/* float 让 legend 变成普通的块，分隔线画在它上方，而不是穿过它 */
.export-group legend { float: left; width: 100%; padding: 16px 0 0; border-top: var(--hair); margin-bottom: 4px; font-weight: bold; }
.export-group > :not(legend) { clear: both; }
.export-group > label { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.export-group[disabled] { opacity: 1; }
.export-group[disabled] .fields { color: #767676; }
.export-group[disabled] legend::after { content: " — not used for BibTeX"; font-weight: normal; font-size: 14px; }
.export-group .with-input input[type="number"] { width: 110px; padding: 6px 8px; }
input[type="radio"] { width: 18px; height: 18px; margin: 0; accent-color: var(--ink); }
.hint { font-size: 14px; font-weight: normal; }
.export .btn-secondary { margin-top: 24px; }