:root {
  color-scheme: light;
  --page: #f5f5f7;
  --page-strong: #ffffff;
  --ink: #1d1d1f;
  --ink-soft: #424245;
  --muted: #6e6e73;
  --hairline: rgba(0, 0, 0, 0.10);
  --hairline-soft: rgba(0, 0, 0, 0.06);
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --green: #00a66c;
  --orange: #f5a623;
  --glass: rgba(255, 255, 255, 0.72);
  --glass-strong: rgba(255, 255, 255, 0.88);
  --shadow-sm: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 22px 70px rgba(0, 0, 0, 0.10);
  --radius-xl: 34px;
  --radius-lg: 28px;
  --radius-md: 22px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--page);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -12rem, rgba(0, 113, 227, 0.18), transparent 34rem),
    linear-gradient(180deg, #fbfbfd 0%, var(--page) 44%, #ededf0 100%);
  font-family: "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.47059;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(0, 113, 227, 0.45);
  outline-offset: 4px;
  border-radius: 999px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  background: rgba(251, 251, 253, 0.72);
  backdrop-filter: saturate(180%) blur(22px);
  -webkit-backdrop-filter: saturate(180%) blur(22px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  padding: 0.78rem 0;
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.62rem;
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: #fff;
  background: linear-gradient(145deg, #1d1d1f, #525256);
  border-radius: 50%;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.35), 0 8px 22px rgba(0, 0, 0, 0.15);
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 800;
}

.nav-links {
  gap: clamp(1rem, 2.6vw, 2rem);
  color: var(--ink-soft);
  font-size: 0.86rem;
  letter-spacing: -0.01em;
}

.nav-links a {
  transition: color 160ms ease;
}

.nav-links a:hover {
  color: var(--blue);
}

main {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.72fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: center;
  min-height: 86vh;
  padding: clamp(4.5rem, 10vw, 8.5rem) 0 clamp(3rem, 7vw, 6rem);
}

.hero-content {
  animation: riseIn 700ms ease both;
}

.eyebrow,
.section-kicker,
.signal-label,
.card-meta {
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
}

h1 {
  max-width: 9ch;
  margin-bottom: 1.05rem;
  color: var(--ink);
  font-size: clamp(4.8rem, 14vw, 11.5rem);
  line-height: 0.88;
  letter-spacing: -0.105em;
}

.hero-lead {
  max-width: 43rem;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: clamp(1.28rem, 2.45vw, 1.95rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.16;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.72rem 1.28rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.018em;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 14px 35px rgba(0, 113, 227, 0.22);
}

.button.primary:hover {
  background: var(--blue-hover);
}

.button.ghost {
  color: var(--blue);
  background: rgba(0, 113, 227, 0.08);
}

.button.ghost:hover {
  background: rgba(0, 113, 227, 0.12);
}

.signal-card,
.about-panel,
.article-card,
.focus-list > div {
  border: 1px solid var(--hairline-soft);
  background: var(--glass);
  box-shadow: var(--shadow-sm);
  backdrop-filter: saturate(160%) blur(28px);
  -webkit-backdrop-filter: saturate(160%) blur(28px);
}

.signal-card {
  position: relative;
  overflow: hidden;
  padding: clamp(1.35rem, 3vw, 2rem);
  border-radius: var(--radius-xl);
  animation: riseIn 700ms 120ms ease both;
}

.signal-card::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    radial-gradient(circle at 72% 18%, rgba(0, 113, 227, 0.18), transparent 11rem),
    radial-gradient(circle at 15% 0%, rgba(0, 166, 108, 0.12), transparent 12rem);
}

.signal-card > * {
  position: relative;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 4.8rem;
}

.signal-grid span {
  aspect-ratio: 1;
  border: 1px solid rgba(0, 0, 0, 0.055);
  border-radius: 1.35rem;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(242, 242, 247, 0.68)),
    rgba(255, 255, 255, 0.78);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 16px 38px rgba(0, 0, 0, 0.08);
}

.signal-grid span:nth-child(2) {
  background: linear-gradient(145deg, rgba(0, 113, 227, 0.16), rgba(255, 255, 255, 0.9));
}

.signal-grid span:nth-child(3) {
  background: linear-gradient(145deg, rgba(0, 166, 108, 0.14), rgba(255, 255, 255, 0.92));
}

.signal-grid span:nth-child(4) {
  background: linear-gradient(145deg, rgba(245, 166, 35, 0.15), rgba(255, 255, 255, 0.9));
}

.signal-card strong {
  display: block;
  margin: 0.55rem 0 0.75rem;
  color: var(--ink);
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.signal-card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.section {
  padding: clamp(4.5rem, 8vw, 7.5rem) 0;
}

.section h2 {
  margin-bottom: 0.8rem;
  color: var(--ink);
  font-size: clamp(2.5rem, 6.6vw, 5.8rem);
  font-weight: 750;
  line-height: 0.95;
  letter-spacing: -0.08em;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(260px, 0.58fr);
  gap: 1.5rem;
  align-items: end;
  margin-bottom: 2rem;
}

.section-heading p:last-child,
.about-panel p,
.focus-list p,
.article-card p {
  color: var(--muted);
}

.about {
  display: grid;
  grid-template-columns: minmax(0, 0.68fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: start;
}

.about-panel {
  padding: clamp(1.35rem, 4vw, 2.6rem);
  border-radius: var(--radius-xl);
  background: var(--page-strong);
}

.about-panel p {
  font-size: clamp(1.04rem, 1.9vw, 1.22rem);
  letter-spacing: -0.025em;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  padding: 1.25rem 0 0;
  margin: 1.65rem 0 0;
  border-top: 1px solid var(--hairline-soft);
  list-style: none;
}

.stats li {
  display: grid;
  gap: 0.45rem;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.stats span,
.focus-list span {
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.article-layout {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 1rem;
}

.article-card {
  display: flex;
  min-height: 18rem;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.3rem, 3vw, 2rem);
  border-radius: var(--radius-lg);
  background: var(--page-strong);
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
}

.article-card:hover,
.article-card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(0, 113, 227, 0.18);
  box-shadow: var(--shadow-md);
}

.article-card.featured {
  grid-row: span 2;
  min-height: 37rem;
  color: #fff;
  background:
    radial-gradient(circle at 80% 18%, rgba(100, 210, 255, 0.34), transparent 15rem),
    linear-gradient(145deg, #101114 0%, #1d1d1f 42%, #2b2d32 100%);
}

.article-card.featured p,
.article-card.featured .card-meta {
  color: rgba(255, 255, 255, 0.74);
}

.article-card.featured a {
  color: #7ec8ff;
}

.article-card.compact {
  min-height: 13rem;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  letter-spacing: 0.045em;
}

.article-card h3 {
  margin: 2rem 0 0.8rem;
  color: inherit;
  font-size: clamp(1.5rem, 3vw, 2.55rem);
  font-weight: 720;
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.article-card a {
  width: fit-content;
  margin-top: 1.5rem;
  color: var(--blue);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.article-card a::after {
  content: " →";
}

.focus .narrow {
  display: block;
  max-width: 48rem;
}

.focus-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.focus-list > div {
  min-height: 16rem;
  padding: 1.55rem;
  border-radius: var(--radius-lg);
  background: var(--glass-strong);
  transition: transform 220ms ease, box-shadow 220ms ease;
}

.focus-list > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-sm);
}

.focus-list h3 {
  margin: 1.75rem 0 0.6rem;
  color: var(--ink);
  font-size: 1.42rem;
  font-weight: 720;
  letter-spacing: -0.045em;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.25rem;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer a {
  color: var(--blue);
  font-weight: 600;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.985);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 860px) {
  .hero,
  .about,
  .section-heading,
  .article-layout,
  .focus-list {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 4.5rem;
  }

  .article-card.featured {
    min-height: 25rem;
  }

  .stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .site-header {
    position: static;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.9rem;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  main,
  .nav,
  .site-footer {
    width: min(100% - 1rem, var(--max-width));
  }

  h1 {
    font-size: clamp(4rem, 23vw, 6.4rem);
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .signal-grid {
    margin-bottom: 2.4rem;
  }

  .card-meta {
    flex-direction: column;
    gap: 0.25rem;
  }
}