/* 每日论文雷达 — simple and clear.
   White page, generous whitespace, one bordered card per paper.
   Colour is used only for: Type 1 (blue), Type 2 (orange), Must-read (red). */

:root {
  --bg: #ffffff;
  --fg: #1c1c1c;
  --muted: #5f5f5f;
  --line: #d9d9d9;
  --line-soft: #ececec;
  --type-1: #1f5fa8;        /* calm blue, 6.3:1 on white */
  --type-1-soft: #e8f0fa;
  --type-2: #a8530a;        /* warm orange, 5.9:1 on white */
  --type-2-soft: #fcefe3;
  --must: #b3261e;          /* red, 6.4:1 on white */
  --must-soft: #fbe9e7;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --measure: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #e6e6e6;
    --muted: #a3a3a3;
    --line: #3a3a3a;
    --line-soft: #2a2a2a;
    --type-1: #8ab8f0;
    --type-1-soft: #172637;
    --type-2: #f0a86a;
    --type-2-soft: #3a2614;
    --must: #f28b82;
    --must-soft: #3b1f1d;
  }
}

* { box-sizing: border-box; }

html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC",
    "Source Han Sans SC", sans-serif;
  line-height: 1.7;
  overflow-wrap: anywhere;
  word-break: break-word;
}

a { color: inherit; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }

img { max-width: 100%; height: auto; display: block; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.skip { position: absolute; left: -9999px; top: 0; padding: .5rem 1rem; background: var(--bg); }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; }

/* Layout */
.site-header, .content, .site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}
.site-header {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .5rem 1.5rem;
  padding-top: 1.75rem; padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line-soft);
}
.site-name { font-weight: 600; text-decoration: none; font-size: 1.05rem; }
.private-mark { font-weight: 400; color: var(--muted); font-size: .9rem; margin-left: .25rem; }
.site-nav { display: flex; flex-wrap: wrap; gap: 1.25rem; font-size: .95rem; }
.site-nav a { color: var(--muted); }
.content { padding-top: 2.5rem; padding-bottom: 4rem; }
.site-footer { padding-top: 1.5rem; padding-bottom: 3rem; border-top: 1px solid var(--line-soft); color: var(--muted); font-size: .9rem; }

/* Type */
h1, h2, h3 { line-height: 1.3; margin: 0; font-weight: 600; }
.page-title { font-size: 2rem; margin-bottom: .75rem; }
.page-intro { color: var(--muted); margin: 0 0 2.5rem; }
h2 { font-size: 1.35rem; margin: 3rem 0 1.25rem; }
h2:first-child { margin-top: 0; }
h2 small, h1 small { font-size: .8rem; font-weight: 400; color: var(--muted); margin-left: .5rem; }
.muted { color: var(--muted); }
.note { color: var(--muted); font-style: normal; }
.c-type-1 { color: var(--type-1); }
.c-type-2 { color: var(--type-2); }

/* Badges */
.badge {
  display: inline-block; padding: 0 .55em; border-radius: 4px;
  font-size: .8rem; line-height: 1.8; font-weight: 500; white-space: nowrap;
  border: 1px solid var(--line);
  color: var(--muted);
}
.badge-type-1 { color: var(--type-1); border-color: var(--type-1); background: var(--type-1-soft); }
.badge-type-2 { color: var(--type-2); border-color: var(--type-2); background: var(--type-2-soft); }
.badge-must { color: var(--must); border-color: var(--must); background: var(--must-soft); font-weight: 600; }
.badge-tag, .badge-evidence { color: var(--muted); }

/* Cards */
.card {
  border: 1px solid var(--line);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 1.1rem 1.25rem 1.1rem 1.25rem;
  margin: 0 0 1.25rem;
}
.card.type-1 { border-left-color: var(--type-1); }
.card.type-2 { border-left-color: var(--type-2); }
.card.must-read { border-left-color: var(--must); }
.card-meta { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .6rem; }
.card-title { font-size: 1.15rem; margin: 0 0 .4rem; }
.card-title a { text-decoration: none; }
.card-title a:hover { text-decoration: underline; }
.card-lead { margin: 0 0 .5rem; }
.card-sub { margin: 0; color: var(--muted); font-size: .9rem; }
.card-how { margin: .75rem 0 0; padding-top: .75rem; border-top: 1px dashed var(--line-soft); font-size: .95rem; }
.topic { border-bottom: 1px dotted var(--muted); }
.card[hidden] { display: none; }

/* Filters */
.filters { margin: 0 0 1.75rem; display: grid; gap: .9rem; }
.search-label { display: block; }
#q {
  width: 100%; font: inherit; font-size: 1rem; padding: .55rem .8rem;
  border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--fg);
}
.filter-group { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }
.filter-group legend { float: left; padding: 0; margin-right: .5rem; color: var(--muted); font-size: .9rem; }
.chip {
  font: inherit; font-size: .9rem; line-height: 1.7; padding: 0 .75em;
  border: 1px solid var(--line); border-radius: 999px; background: var(--bg); color: var(--fg); cursor: pointer;
}
.chip.is-active { border-color: var(--fg); background: var(--fg); color: var(--bg); }
.chip-type-1.is-active { border-color: var(--type-1); background: var(--type-1); }
.chip-type-2.is-active { border-color: var(--type-2); background: var(--type-2); }

/* Date list */
.date-list, .toc ul, .links ul, .project-links ul { list-style: none; padding: 0; margin: 0; }
.date-list li { padding: .45rem 0; border-bottom: 1px solid var(--line-soft); }
.toc ul { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; margin-bottom: 1rem; }

/* Paper page */
.paper-head { padding-bottom: 1.5rem; border-bottom: 1px solid var(--line-soft); }
.paper-title { font-size: 1.75rem; margin-bottom: .75rem; }
.paper-authors { margin: 0 0 .25rem; }
.paper-venue { margin: 0 0 1rem; color: var(--muted); font-size: .95rem; }
.paper-badges { display: flex; flex-wrap: wrap; gap: .4rem; margin: 0 0 .75rem; }
.paper-evidence { margin: 0 0 1.25rem; font-size: .95rem; }
.paper-evidence .muted { font-size: .85rem; }
.lead { font-size: 1.2rem; line-height: 1.6; margin: 0; }
.read-first p { margin: 0; padding: 1rem 1.25rem; border: 1px solid var(--line); border-radius: 6px; }
.refs { padding-left: 1.4rem; margin: 0; }
.refs li { margin-bottom: .6rem; }
.ref { color: var(--muted); font-size: .9rem; white-space: nowrap; }
.project-links li { margin-bottom: 1rem; padding: .9rem 1.1rem; border: 1px dashed var(--line); border-radius: 6px; }
.links li { margin-bottom: .4rem; }
.links .muted { font-size: .85rem; font-family: var(--mono); }

/* Markdown body */
.prose > :first-child { margin-top: 0; }
.prose p, .prose ul, .prose ol, .prose blockquote, .prose pre, .prose table { margin: 0 0 1rem; }
.prose h3, .prose h4, .prose h5, .prose h6 { font-size: 1.05rem; margin: 1.5rem 0 .5rem; }
.prose blockquote { margin-left: 0; padding-left: 1rem; border-left: 3px solid var(--line); color: var(--muted); }
.prose code { font-family: var(--mono); font-size: .9em; }
.prose pre { padding: .9rem 1rem; border: 1px solid var(--line); border-radius: 6px; overflow-x: auto; }
.prose table { border-collapse: collapse; display: block; overflow-x: auto; font-size: .95rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: .35rem .6rem; text-align: left; }

/* Figures */
.figures figure { margin: 0 0 2rem; }
.figures img { border: 1px solid var(--line-soft); border-radius: 4px; }
.figures figcaption { font-size: .95rem; margin-top: .5rem; }
.figures .credit { display: block; color: var(--muted); font-size: .85rem; }

/* Small screens */
@media (max-width: 480px) {
  html { font-size: 16px; }
  .site-header, .content, .site-footer { padding-left: 1rem; padding-right: 1rem; }
  .page-title { font-size: 1.6rem; }
  .paper-title { font-size: 1.45rem; }
  .card { padding: .9rem 1rem; }
  .ref { white-space: normal; }
}