:root {
  --black:       #080808;
  --black-2:     #111111;
  --black-3:     #1a1a1a;
  --white:       #ffffff;
  --off-white:   #f5f5f7;
  --ink:         #1d1d1f;
  --muted:       #6e6e73;
  --accent:      #0057ff;
  --accent-h:    #0044cc;
  --green:       #00a651;
  --border-dark: rgba(255,255,255,0.09);
  --max-w:       1280px;
  --read-w:      760px;
  --nav-h:       60px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--black); color: var(--white);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: var(--nav-h); display: flex; align-items: center;
  padding: 0 40px; background: rgba(8,8,8,0.72);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-dark);
}
.nav-logo { margin-right: auto; display: inline-flex; align-items: center; line-height: 0; }
.nav-logo img { height: 22px; width: auto; display: block; }
.nav-links { list-style: none; display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: rgba(255,255,255,0.85);
  transition: color .2s;
}
.nav-links a:hover { color: var(--white); }
.nav-cta {
  background: var(--accent); color: var(--white) !important;
  padding: 8px 16px; border-radius: 100px; font-weight: 700 !important;
  transition: background .2s, transform .15s;
}
.nav-cta:hover { background: var(--accent-h); transform: translateY(-1px); }

.breadcrumb {
  padding: calc(var(--nav-h) + 22px) 40px 0;
  max-width: var(--max-w); margin: 0 auto;
  font-size: 11px; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: rgba(255,255,255,0.4);
  display: flex; align-items: center; gap: 10px;
  flex-wrap: wrap;
}
.breadcrumb a { color: rgba(255,255,255,0.55); transition: color .2s; }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb [data-lucide] { width: 12px; height: 12px; opacity: 0.5; }
.breadcrumb .current { color: var(--white); }

.article-hero {
  position: relative; overflow: hidden;
  padding: 36px 40px 24px;
}
.article-hero::before {
  content: ''; position: absolute; top: -240px; left: -180px;
  width: 720px; height: 720px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,87,255,0.15) 0%, rgba(0,87,255,0) 65%);
  pointer-events: none; z-index: 0;
}
.article-hero-inner {
  position: relative; z-index: 1;
  max-width: var(--read-w); margin: 0 auto;
}
.article-meta {
  display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
  font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: rgba(255,255,255,0.55);
  margin-bottom: 20px;
}
.article-meta .lang {
  background: rgba(0,87,255,0.18);
  color: #4d8eff;
  padding: 4px 10px; border-radius: 4px;
  letter-spacing: 0.05em;
}
.article-meta .source {
  color: rgba(255,255,255,0.75);
}
.article-h1 {
  font-size: clamp(28px, 3.4vw, 44px); font-weight: 900;
  letter-spacing: -0.025em; line-height: 1.16;
  color: var(--white);
  margin-bottom: 24px;
}

.article-image {
  max-width: var(--max-w); margin: 0 auto;
  padding: 0 40px;
}
.article-image figure {
  max-width: var(--read-w); margin: 0 auto;
  border-radius: 16px; overflow: hidden;
  border: 1px solid var(--border-dark);
  background: var(--black-2);
  aspect-ratio: 16 / 9;
}
.article-image img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.article-body {
  max-width: var(--read-w); margin: 0 auto;
  padding: 36px 40px 56px;
}
.article-body p {
  font-size: 16px; line-height: 1.85;
  color: rgba(255,255,255,0.82);
  margin-bottom: 22px;
}
.article-body p:lang(zh) { font-size: 16.5px; line-height: 1.95; }
.article-body h2 {
  font-size: 22px; font-weight: 800; letter-spacing: -0.02em;
  color: var(--white);
  margin: 40px 0 16px;
}
.article-body h3 {
  font-size: 18px; font-weight: 700;
  color: var(--white);
  margin: 32px 0 12px;
}
.article-body strong { color: var(--white); font-weight: 700; }
.article-body em { font-style: italic; color: rgba(255,255,255,0.9); }
.article-body a {
  color: #4d8eff;
  border-bottom: 1px solid rgba(77,142,255,0.3);
  transition: color .2s, border-color .2s;
}
.article-body a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.article-body ul, .article-body ol {
  margin: 8px 0 22px 22px;
  display: flex; flex-direction: column; gap: 10px;
}
.article-body li {
  font-size: 16px; line-height: 1.75;
  color: rgba(255,255,255,0.78);
}
.article-body figure {
  margin: 28px 0;
  border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border-dark);
}
.article-body figure img { width: 100%; height: auto; }
.article-body blockquote {
  margin: 28px 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--accent);
  font-size: 17px; line-height: 1.7;
  color: rgba(255,255,255,0.88);
  font-style: italic;
}

.qa-block {
  margin-bottom: 28px;
  padding: 22px 24px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-dark);
  border-radius: 12px;
}
.qa-q {
  font-weight: 700; color: var(--white);
  margin-bottom: 12px;
  font-size: 15px; line-height: 1.5;
  display: flex; gap: 10px;
}
.qa-q::before {
  content: 'Q';
  flex-shrink: 0;
  width: 22px; height: 22px;
  background: var(--accent); color: white;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800;
}
.qa-a {
  color: rgba(255,255,255,0.78);
  font-size: 15px; line-height: 1.75;
  padding-left: 32px;
}

.article-footer {
  max-width: var(--read-w); margin: 0 auto;
  padding: 24px 40px 56px;
  border-top: 1px solid var(--border-dark);
}
.publisher-link {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0,87,255,0.1);
  border: 1px solid rgba(0,87,255,0.35);
  color: var(--white);
  padding: 12px 20px; border-radius: 100px;
  font-size: 14px; font-weight: 600;
  margin-top: 20px;
  transition: background .2s, transform .15s, border-color .2s;
}
.publisher-link:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.publisher-link [data-lucide] { width: 14px; height: 14px; }
.publisher-source {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 4px;
}
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 600;
  color: rgba(255,255,255,0.65);
  margin-top: 28px;
  transition: gap .2s, color .2s;
}
.back-link:hover { color: var(--white); gap: 10px; }
.back-link [data-lucide] { width: 14px; height: 14px; }

footer { background: #030303; border-top: 1px solid rgba(255,255,255,0.05); padding: 64px 40px 40px; }
.footer-inner { max-width: var(--max-w); margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-logo { font-size: 17px; font-weight: 900; letter-spacing: -0.05em; margin-bottom: 10px; }
.footer-tagline { font-size: 13px; color: rgba(255,255,255,0.28); line-height: 1.65; max-width: 240px; }
.footer-col-head { font-size: 11px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.22); margin-bottom: 14px; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,0.42); transition: color .2s; }
.footer-links a:hover { color: var(--white); }
.footer-bottom { padding-top: 28px; border-top: 1px solid rgba(255,255,255,0.05); }
.footer-legal-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; }
.footer-copy { font-size: 12px; color: rgba(255,255,255,0.5); }
.footer-social { display: flex; gap: 20px; }
.footer-social a { font-size: 13px; color: rgba(255,255,255,0.5); transition: color .2s; }
.footer-social a:hover { color: var(--white); }
.footer-legal-text p { font-size: 11px; line-height: 1.65; color: rgba(255,255,255,0.42); margin-top: 10px; }

@media (max-width: 960px) {
  .article-hero, .article-image, .article-body, .article-footer { padding-left: 20px; padding-right: 20px; }
  .breadcrumb { padding: calc(var(--nav-h) + 18px) 20px 0; }
  .nav { padding: 0 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  footer { padding: 56px 20px 32px; }
}
@media (max-width: 560px) {
  .nav-links { gap: 16px; }
  .nav-links li:not(:last-child):not(:first-child) { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}