:root {
  color: #e7f1fb;
  background: #080c12;
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
body { min-width: 320px; margin: 0; background: #080c12; color: #e7f1fb; }
button, input { font: inherit; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 54px;
  padding: 0 clamp(18px, 4vw, 52px);
  border-bottom: 1px solid #1b2b3d;
  background: #0c1119;
}
.brand { color: #e9f5ff; font-size: 15px; font-weight: 700; text-decoration: none; }
.header-meta, .eyebrow { color: #7995af; font-size: 12px; letter-spacing: .1em; }

main { max-width: 1080px; margin: 0 auto; padding: 38px clamp(18px, 4vw, 44px) 80px; }
.intro { max-width: 900px; margin: 0 auto; padding: 0 8px; }
.eyebrow { margin: 0 0 12px; font-weight: 700; }
h1 { margin: 0; color: #f2f8ff; font-size: clamp(29px, 4vw, 44px); line-height: 1.2; letter-spacing: 0; }
.intro-copy { max-width: 660px; margin: 14px 0 0; color: #9ab2c8; font-size: 15px; line-height: 1.75; }

.toolbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 22px;
  max-width: 900px;
  margin: 34px auto 20px;
  padding: 16px 8px;
  border-top: 1px solid #203448;
  border-bottom: 1px solid #203448;
}
.toolbar label { display: grid; gap: 7px; color: #91aabd; font-size: 13px; font-weight: 700; }
.toolbar-note { color: #718ba3; font-size: 13px; }
input {
  width: min(370px, 82vw);
  border: 1px solid #29445c;
  border-radius: 4px;
  padding: 10px 12px;
  background: #0b1420;
  color: #eff8ff;
  outline-color: #00c8ef;
}

.briefing-list { display: grid; gap: 20px; }
.briefing-card {
  width: min(100%, 900px);
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid #20364c;
  border-radius: 7px;
  background: #101a28;
  box-shadow: 0 16px 34px rgba(0, 0, 0, .18);
}
.card-link { display: block; color: inherit; text-decoration: none; }
.card-link:focus-visible { outline: 2px solid #00c8ef; outline-offset: -2px; }
.card-image { aspect-ratio: 16 / 9; background: #0b121c; border-bottom: 1px solid #20364c; }
.card-image img { display: block; width: 100%; height: 100%; object-fit: cover; }
.card-copy { padding: 24px 30px 22px; background: #101a28; }
.card-topline, .card-footer { display: flex; justify-content: space-between; gap: 14px; color: #8ca8c0; font-size: 13px; }
.headline-chip {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border: 1px solid #007fa4;
  border-radius: 999px;
  color: #00c9f1;
  font-size: 12px;
  font-weight: 700;
}
h2 { margin: 16px 0 10px; color: #f3f8ff; font-size: clamp(22px, 3vw, 30px); line-height: 1.38; letter-spacing: 0; }
.summary { margin: 0; color: #c2d2e1; font-size: 15px; line-height: 1.8; }
.source-line { margin: 13px 0 0; color: #8aa6c0; font-size: 13px; line-height: 1.65; }
.source-line a { color: #00c8ef; text-decoration: none; }
.source-line a:hover, .source-line a:focus-visible { text-decoration: underline; }
.card-footer { margin-top: 19px; padding-top: 13px; border-top: 1px solid #21394f; }
.empty { margin: 0; padding: 36px 0; color: #8ba4bb; text-align: center; border-top: 1px solid #203448; border-bottom: 1px solid #203448; }

dialog { width: min(940px, calc(100vw - 28px)); max-height: calc(100vh - 28px); border: 1px solid #29465f; padding: 0; background: #0f1825; color: #e7f1fb; }
dialog::backdrop { background: rgba(0, 0, 0, .72); }
.dialog-close { position: sticky; top: 10px; float: right; z-index: 2; width: 36px; height: 36px; margin: 10px; border: 1px solid #35546b; border-radius: 4px; background: #101d2b; color: #dcecf9; font-size: 26px; cursor: pointer; }
.detail { padding: 32px; }
.detail-header { padding-bottom: 20px; border-bottom: 1px solid #29475e; }
.detail-header h2 { margin-top: 8px; font-size: 32px; }
.detail-header > p:last-child { margin: 0; color: #94abc0; line-height: 1.7; }
.detail-story { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 26px; padding: 26px 0; border-bottom: 1px solid #21394f; }
.detail-story img { width: 100%; max-height: 330px; object-fit: cover; }
.detail-story h3 { margin: 0 0 12px; color: #f3f8ff; font-size: 22px; line-height: 1.4; }
.detail-story p { margin: 0 0 14px; color: #c2d2e1; line-height: 1.8; }
.detail-label { color: #00c8ef; font-weight: 700; }

@media (max-width: 720px) {
  .site-header { min-height: 48px; }
  .header-meta { display: none; }
  main { padding-top: 28px; }
  .toolbar { align-items: stretch; flex-direction: column; }
  .card-copy { padding: 20px; }
  .detail { padding: 22px; }
  .detail-story { grid-template-columns: 1fr; gap: 18px; }
  .detail-story img { max-height: none; }
}