/* ============================================================
   AI 每日速递 · Daily Digest — editorial dark theme
   Shared by every {date}.html, the viewer (index.html) and calendar.html
   ============================================================ */

:root {
  /* surfaces */
  --bg:        #0b0c10;
  --bg-2:      #0f1117;
  --panel:     #14161e;
  --panel-2:   #191c26;
  --line:      rgba(255, 255, 255, 0.075);
  --line-2:    rgba(255, 255, 255, 0.14);

  /* ink */
  --ink:       #ECEEF3;
  --ink-dim:   #AAB1BF;
  --ink-faint: #6B7280;

  /* accents */
  --gold:    #F5B544;   /* masthead / headlines */
  --cyan:    #4FD1C5;   /* community buzz */
  --violet:  #A98BFF;   /* products & concepts */
  --green:   #5DD971;   /* github / stars */
  --red:     #FF6B6B;

  --accent: var(--gold);            /* per-section override */
  --accent-soft: rgba(245,181,68,.12);

  --serif: "Noto Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --sans:  "Inter", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono:  "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;

  --radius: 8px;
  --maxw: 940px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ============================================================
   MASTHEAD
   ============================================================ */
.masthead {
  padding: 54px 0 26px;
  border-bottom: 1px solid var(--line-2);
  position: relative;
}
.masthead::before {
  content: "";
  position: absolute; top: 18px; left: 0; right: 0;
  height: 1px;
  background: var(--line-2);
}
.mh-kicker {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px; letter-spacing: 0; text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 18px;
}
.mh-kicker .live {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--gold);
}
.mh-kicker .live .pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 0 rgba(245,181,68,.55);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(245,181,68,.5); }
  70%  { box-shadow: 0 0 0 9px rgba(245,181,68,0); }
  100% { box-shadow: 0 0 0 0 rgba(245,181,68,0); }
}
.mh-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: 0;
  margin: 0;
  color: var(--ink);
}
.mh-title .en {
  display: block;
  font-size: 15px;
  letter-spacing: 0;
  font-family: var(--mono);
  font-weight: 500;
  color: var(--ink-faint);
  margin-top: 14px;
  text-transform: uppercase;
}
.mh-meta {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 18px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px; color: var(--ink-dim);
}
.mh-meta .date { color: var(--ink); font-weight: 600; }
.mh-meta .sep { color: var(--ink-faint); }
.mh-meta .edition {
  font-family: var(--mono); font-size: 12px;
  color: var(--gold); border: 1px solid var(--gold-soft, rgba(245,181,68,.3));
  padding: 2px 9px; border-radius: 999px;
  background: var(--accent-soft);
}
.mh-intro {
  margin: 26px 0 0;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.5;
  color: var(--ink);
  max-width: 760px;
}
.mh-intro::first-letter {
  font-size: 1.05em; color: var(--gold);
}

/* stat strip */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px; margin-top: 30px;
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--line);
}
.stat { background: var(--panel); padding: 16px 18px; }
.stat .n { font-family: var(--mono); font-size: 26px; font-weight: 600; line-height: 1; }
.stat .l { font-size: 12px; color: var(--ink-faint); margin-top: 7px; letter-spacing: 0; }
.stat:nth-child(1) .n { color: var(--gold); }
.stat:nth-child(2) .n { color: var(--cyan); }
.stat:nth-child(3) .n { color: var(--violet); }
.stat:nth-child(4) .n { color: var(--green); }
.stat-headlines .n { color: var(--gold) !important; }
.stat-papers .n { color: #ff8fa3 !important; }
.stat-community .n { color: var(--cyan) !important; }
.stat-products .n { color: var(--violet) !important; }
.stat-repos .n { color: var(--green) !important; }

/* ============================================================
   DAILY BRIEFING
   ============================================================ */
.briefing { padding: 34px 0 14px; }
.briefing-head {
  display: flex; align-items: end; justify-content: space-between; gap: 20px;
  margin-bottom: 16px;
}
.briefing-head .eyebrow {
  display: block; margin-bottom: 4px;
  font-family: var(--mono); font-size: 11px; color: var(--gold);
}
.briefing-head h2 {
  margin: 0; font-family: var(--serif); font-size: 24px; line-height: 1.2;
}
.briefing-more {
  min-height: 40px; display: inline-flex; align-items: center;
  border: 1px solid var(--line-2); border-radius: 6px; padding: 0 14px;
  color: var(--ink-dim); font-size: 13px;
  transition: border-color .18s ease, color .18s ease, transform .14s ease;
}
.briefing-more:hover { border-color: var(--gold); color: var(--gold); }
.briefing-more:active { transform: scale(.98); }
.briefing-grid {
  display: grid; grid-template-columns: 1.35fr 1fr 1fr;
  gap: 1px; overflow: hidden;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--line);
}
.brief-item {
  min-width: 0; min-height: 244px; padding: 20px;
  display: flex; flex-direction: column; position: relative;
  background: var(--panel);
  transition: background .18s ease, color .18s ease;
}
.brief-item:hover { background: var(--panel-2); }
.brief-item:focus-visible,
.row:focus-visible,
.lead:focus-visible,
.card:focus-visible,
.repo:focus-visible,
.briefing-more:focus-visible,
.topic-rail a:focus-visible,
.foot a:focus-visible {
  outline: 2px solid var(--gold); outline-offset: 2px;
}
.brief-rank {
  font-family: var(--mono); font-size: 12px; color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.brief-section {
  margin-top: 18px; font-family: var(--mono); font-size: 11px; color: var(--ink-faint);
}
.brief-item h3 {
  margin: 8px 30px 0 0; font-family: var(--serif); font-size: 18px;
  line-height: 1.35; text-wrap: balance;
}
.brief-item-1 h3 { font-size: 22px; }
.brief-item p {
  margin: 10px 0 24px; color: var(--ink-dim); font-size: 13px;
  line-height: 1.6; text-wrap: pretty;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 4; overflow: hidden;
}
.brief-arrow { position: absolute; right: 18px; top: 18px; color: var(--ink-faint); }
.brief-item:hover .brief-arrow { color: var(--gold); }
.coverage-bar {
  display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: center;
  padding: 14px 0; border-bottom: 1px solid var(--line);
}
.coverage-copy {
  display: flex; align-items: center; flex-wrap: wrap; gap: 6px;
  font-size: 12px; color: var(--ink-faint); white-space: nowrap;
}
.coverage-copy span { color: var(--ink-dim); }
.coverage-copy b {
  color: var(--ink); font-family: var(--mono); font-size: 14px;
  font-variant-numeric: tabular-nums;
}
.coverage-copy i { width: 3px; height: 3px; border-radius: 50%; background: var(--line-2); }
.topic-rail { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 6px; }
.topic-rail a {
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 9px;
  color: var(--ink-dim); font-size: 11px;
  transition: border-color .18s ease, color .18s ease;
}
.topic-rail a:hover { border-color: var(--gold); color: var(--gold); }

/* ============================================================
   SECTIONS
   ============================================================ */
.sec { padding: 46px 0 8px; }
.sec-head {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 26px;
}
.sec-no {
  font-family: var(--mono); font-size: 13px; font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--accent);
  width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  flex: none;
  box-shadow: 0 0 22px -8px var(--accent);
}
.sec-head h2 {
  font-family: var(--serif); font-weight: 700;
  font-size: 28px; margin: 0; letter-spacing: 0;
}
.sec-head .sec-meta {
  margin-left: auto;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0;
  text-transform: uppercase; color: var(--ink-faint);
  text-align: right;
}

/* ---- lead / featured headline ---- */
.lead {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 26px 28px 28px;
  position: relative;
  overflow: hidden;
  transition: border-color .2s ease, transform .2s ease;
}
.lead::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent);
}
.lead:hover { border-color: var(--accent); transform: translateY(-2px); }
.lead .tag { margin-bottom: 14px; }
.lead h3 {
  font-family: var(--serif); font-weight: 700;
  font-size: 28px; line-height: 1.22;
  margin: 0 0 12px;
}
.lead p { margin: 0; color: var(--ink-dim); font-size: 15.5px; max-width: 720px; }
.lead .src { margin-top: 18px; }

/* ---- list rows (headlines / community) ---- */
.rows { display: grid; gap: 2px; margin-top: 16px; }
.row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px; align-items: start;
  padding: 18px 16px;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}
.row:hover { background: var(--panel); border-color: var(--line); transform: translateX(3px); }
.row .idx {
  font-family: var(--mono); font-size: 13px; color: var(--ink-faint);
  padding-top: 2px; min-width: 22px; text-align: right;
}
.row .body h4 {
  margin: 0 0 6px; font-size: 16.5px; font-weight: 600; line-height: 1.35;
}
.row:hover .body h4 { color: var(--accent); }
.row .body p { margin: 0; font-size: 14px; color: var(--ink-dim); }
.row .meta-line {
  display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center;
  margin-top: 10px; font-size: 12.5px; color: var(--ink-faint);
}
.row .arrow {
  color: var(--ink-faint); font-size: 18px; padding-top: 2px;
  transition: color .18s ease, transform .18s ease;
}
.row:hover .arrow { color: var(--accent); transform: translate(2px,-2px); }

/* quote (community voices) */
.quote {
  margin: 12px 0 2px; padding: 12px 16px;
  border-left: 2px solid var(--accent);
  background: rgba(255,255,255,.025);
  border-radius: 0 6px 6px 0;
  font-family: var(--serif); font-style: italic;
  color: var(--ink); font-size: 14.5px;
}

/* ---- product / concept cards ---- */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 16px; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); padding: 20px 20px 22px;
  display: flex; flex-direction: column; gap: 10px;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); background: var(--panel-2); }
.card .ct { display: flex; align-items: center; gap: 10px; }
.card .ct .ico {
  width: 30px; height: 30px; border-radius: 8px; flex: none;
  display: grid; place-items: center; font-size: 16px;
  background: var(--accent-soft); border: 1px solid var(--line);
}
.card .ct h4 { margin: 0; font-size: 17px; font-weight: 700; }
.card .tagline { font-size: 13px; color: var(--accent); font-family: var(--mono); margin: -4px 0 0; }
.card p { margin: 0; font-size: 14px; color: var(--ink-dim); flex: 1; }

/* ---- repo rows ---- */
.repo {
  display: grid; grid-template-columns: 1fr auto; gap: 14px; align-items: center;
  padding: 18px 18px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--panel); margin-top: 12px;
  transition: border-color .2s ease, transform .2s ease;
}
.repo:hover { border-color: var(--green); transform: translateX(3px); }
.repo .name { font-family: var(--mono); font-size: 16px; font-weight: 600; }
.repo .name b { color: var(--green); font-weight: 600; }
.repo .desc { margin: 6px 0 0; font-size: 14px; color: var(--ink-dim); }
.repo .repo-meta { display: flex; gap: 8px 14px; flex-wrap: wrap; margin-top: 10px; font-size: 12.5px; color: var(--ink-faint); }
.repo .stars {
  text-align: right; white-space: nowrap;
  font-family: var(--mono);
}
.repo .stars .total { font-size: 19px; font-weight: 600; color: var(--ink); }
.repo .stars .today { font-size: 12px; color: var(--green); margin-top: 4px; }
.lang-dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; margin-right: 5px; vertical-align: middle; }

/* ---- shared bits ---- */
.tag {
  display: inline-block; font-family: var(--mono);
  font-size: 10.5px; letter-spacing: 0; text-transform: uppercase;
  color: var(--accent); padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--accent); background: var(--accent-soft);
  white-space: nowrap;
}
.dotsep { color: var(--ink-faint); }
.src {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint);
  display: inline-flex; align-items: center; gap: 6px;
}
.src b { color: var(--ink-dim); font-weight: 500; }
.item-signals {
  display: flex; align-items: center; flex-wrap: wrap; gap: 6px;
  margin-top: 10px;
}
.signal-badge {
  display: inline-flex; align-items: center; min-height: 24px;
  border: 1px solid var(--line); border-radius: 4px; padding: 2px 7px;
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint);
}
.signal-badge.source-count { color: var(--gold); border-color: rgba(245,181,68,.28); }
.signal-badge.attribution { color: var(--ink-dim); }
.signal-badge.topic { color: var(--accent); border-color: var(--accent-soft); }

/* ============================================================
   FOOTER
   ============================================================ */
.foot {
  margin-top: 60px; padding: 34px 0 70px;
  border-top: 1px solid var(--line-2);
  color: var(--ink-faint); font-size: 13px;
}
.foot .foot-top { display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; align-items: center; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 8px; }
.foot a.back {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2); padding: 9px 16px; border-radius: 999px;
  color: var(--ink-dim); transition: border-color .18s ease, color .18s ease, transform .14s ease; font-size: 13px;
}
.foot a.back:hover { border-color: var(--gold); color: var(--gold); }
.foot a.back:active { transform: scale(.98); }
.foot .made { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0; }
.foot .disclaimer { margin-top: 18px; font-size: 11.5px; line-height: 1.7; opacity: .8; max-width: 760px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px) {
  .mh-title { font-size: 38px; line-height: 1.1; }
  .mh-title .en { font-size: 12px; margin-top: 10px; }
  .mh-intro { font-size: 18px; }
  .briefing-grid { grid-template-columns: 1fr; }
  .brief-item { min-height: auto; }
  .brief-item-1 h3, .brief-item h3 { font-size: 18px; }
  .coverage-bar { grid-template-columns: 1fr; gap: 10px; }
  .topic-rail { justify-content: flex-start; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats .stat:last-child:nth-child(odd) { grid-column: span 2; }
  .cards { grid-template-columns: 1fr; }
  .repo { grid-template-columns: 1fr; }
  .repo .stars { text-align: left; display: flex; gap: 14px; align-items: baseline; }
  .sec-head .sec-meta { display: none; }
  .row { grid-template-columns: auto 1fr; }
  .row .arrow { display: none; }
}

@media (max-width: 460px) {
  .wrap { padding: 0 16px; }
  .masthead { padding-top: 42px; }
  .mh-kicker .sep, .mh-kicker > span:last-child { display: none; }
  .briefing-head { align-items: center; }
  .briefing-more { padding: 0 10px; }
  .coverage-copy { white-space: normal; }
  .sec { padding-top: 38px; }
  .sec-head { gap: 10px; }
  .sec-head h2 { font-size: 24px; }
  .lead { padding: 22px 20px; }
  .lead h3 { font-size: 23px; }
  .row { gap: 10px; padding: 16px 8px; }
  .foot .made { width: 100%; }
}

/* reveal-on-scroll (progressive enhancement) */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse { animation: none; }
}