:root {
  --bg: #ffffff;
  --surface: #f7f9fc;
  --text: #0d1b2e;
  --text-2: #4e5f73;
  --text-3: #7a8899;
  --border: #dfe6ef;
  --border-strong: #ccd6e3;
  --navy: #082d68;
  --navy-dark: #061f48;
  --blue: #0b63e5;
  --blue-soft: #eaf2ff;
  --container: 1120px;
  --radius: 12px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
:focus-visible { outline: 3px solid rgba(11,99,229,.28); outline-offset: 3px; }

.container { width: min(calc(100% - 40px), var(--container)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(204,214,227,.88);
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(16px);
}
.header-inner {
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 17px;
  font-weight: 760;
  letter-spacing: -.02em;
  white-space: nowrap;
}
.brand img { width: 30px; height: 30px; border-radius: 7px; }
.brand span:last-child { color: var(--text-2); font-weight: 650; }
.header-nav { display: flex; gap: 24px; margin-left: auto; }
.header-nav a { color: var(--text-2); text-decoration: none; font-size: 14px; font-weight: 620; }
.header-nav a[aria-current="page"], .header-nav a:hover { color: var(--blue); }
.header-cta {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 720;
}

.blog-hero {
  padding: 78px 0 76px;
  background: var(--navy);
  color: #fff;
}
.blog-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(420px, 1.12fr);
  gap: 72px;
  align-items: end;
}
.blog-hero h1 {
  max-width: 620px;
  margin: 0;
  font-size: clamp(42px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: -.05em;
}
.blog-hero p {
  max-width: 620px;
  margin: 0;
  color: rgba(255,255,255,.72);
  font-size: 18px;
  line-height: 1.8;
}

.latest-section { padding: 62px 0 24px; }
.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.section-heading h2 { margin: 0; font-size: 28px; letter-spacing: -.035em; }
.section-heading p { margin: 0; color: var(--text-3); font-size: 13px; }

.featured-article {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: 42px;
  align-items: center;
  padding: 34px 0 46px;
  border-bottom: 1px solid var(--border);
}
.featured-media {
  overflow: hidden;
  min-height: 310px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.featured-media img { width: 100%; height: 100%; min-height: 310px; aspect-ratio: 16 / 9; object-fit: cover; }
.featured-placeholder {
  min-height: 310px;
  display: grid;
  place-items: center;
  background: #eef3f8;
}
.featured-placeholder img { width: 64px; height: 64px; min-height: 0; object-fit: contain; opacity: .68; }
.featured-copy { max-width: 460px; }
.featured-meta { display: flex; gap: 12px; color: var(--blue); font-size: 12px; font-weight: 740; }
.featured-copy h3 { margin: 12px 0 0; font-size: 32px; line-height: 1.3; letter-spacing: -.035em; }
.featured-copy p { margin: 14px 0 0; color: var(--text-2); font-size: 15px; line-height: 1.75; }
.featured-link { display: inline-flex; margin-top: 20px; color: var(--blue); text-decoration: none; font-size: 14px; font-weight: 720; }
.featured-link::after { content: "→"; margin-left: 7px; }

.archive-section { padding: 54px 0 84px; }
.archive-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  margin-bottom: 26px;
}
.archive-title h2 { margin: 0; font-size: 30px; letter-spacing: -.035em; }
.archive-title p { margin: 5px 0 0; color: var(--text-3); font-size: 13px; }
.filter-tabs { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.filter-tab {
  padding: 5px 0 7px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  font-size: 13px;
  font-weight: 680;
}
.filter-tab:hover { color: var(--text); }
.filter-tab.active { border-color: var(--blue); color: var(--blue); }

.article-list { border-top: 1px solid var(--border); }
.article-row {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  min-height: 168px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: opacity .18s ease, transform .18s ease;
}
.article-row:hover { transform: translateX(3px); }
.article-row[hidden] { display: none; }
.article-thumb {
  overflow: hidden;
  width: 220px;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border);
  background: var(--surface);
}
.article-thumb img { width: 100%; height: 100%; object-fit: cover; }
.article-thumb.placeholder { display: grid; place-items: center; background: #f0f4f8; }
.article-thumb.placeholder img { width: 44px; height: 44px; object-fit: contain; opacity: .55; }
.article-main { min-width: 0; }
.article-kicker { color: var(--blue); font-size: 11px; font-weight: 760; }
.article-main h3 {
  margin: 7px 0 0;
  font-size: 21px;
  line-height: 1.42;
  letter-spacing: -.02em;
}
.article-main p {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  max-width: 720px;
  margin: 8px 0 0;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.7;
}
.article-date { align-self: start; padding-top: 4px; color: var(--text-3); font-size: 12px; font-variant-numeric: tabular-nums; white-space: nowrap; }

.empty-state { padding: 50px 0; border-bottom: 1px solid var(--border); color: var(--text-3); text-align: center; }

.blog-cta { padding: 70px 0; background: var(--surface); border-top: 1px solid var(--border); }
.blog-cta-inner { display: grid; grid-template-columns: 1fr auto; gap: 36px; align-items: center; }
.blog-cta h2 { margin: 0; font-size: 34px; letter-spacing: -.04em; }
.blog-cta p { margin: 8px 0 0; color: var(--text-2); }
.blog-cta a { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 0 20px; border-radius: 8px; background: var(--blue); color: #fff; text-decoration: none; font-weight: 720; }

.site-footer { padding: 36px 0 44px; color: var(--text-3); font-size: 12px; }
.footer-inner { display: flex; justify-content: space-between; gap: 26px; padding-top: 20px; border-top: 1px solid var(--border); }
.footer-inner a { color: var(--text-2); text-decoration: none; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }

@media (max-width: 800px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .header-inner { min-height: 62px; gap: 12px; }
  .brand { font-size: 15px; }
  .brand img { width: 28px; height: 28px; }
  .brand span:last-child { display: none; }
  .header-nav { display: none; }
  .header-cta { margin-left: auto; }
  .blog-hero { padding: 54px 0 48px; }
  .blog-hero-grid { grid-template-columns: 1fr; gap: 22px; }
  .blog-hero h1 { font-size: 40px; }
  .blog-hero p { font-size: 15px; }
  .latest-section { padding-top: 40px; }
  .section-heading { align-items: start; flex-direction: column; gap: 4px; }
  .featured-article { grid-template-columns: 1fr; gap: 24px; padding-top: 24px; }
  .featured-media, .featured-media img, .featured-placeholder { min-height: 0; }
  .featured-media img { aspect-ratio: 16 / 9; }
  .featured-copy h3 { font-size: 27px; }
  .archive-section { padding: 44px 0 64px; }
  .archive-toolbar { align-items: flex-start; flex-direction: column; gap: 18px; }
  .filter-tabs { width: 100%; gap: 16px; overflow-x: auto; padding-bottom: 2px; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; }
  .filter-tab { flex: 0 0 auto; }
  .article-row { grid-template-columns: 1fr; gap: 13px; padding: 20px 0 24px; }
  .article-thumb { width: 100%; }
  .article-main h3 { font-size: 19px; }
  .article-date { grid-row: 2; grid-column: 1; justify-self: end; padding: 0; }
  .article-main { grid-row: 2; grid-column: 1; padding-right: 84px; }
  .article-main p { display: none; }
  .blog-cta { padding: 54px 0; }
  .blog-cta-inner { grid-template-columns: 1fr; gap: 24px; }
  .blog-cta h2 { font-size: 29px; }
  .blog-cta a { width: 100%; }
  .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: .001ms !important; }
}