/* ===== 余驰宇律师 - 跨境投资法律实务 ===== */
:root {
  --navy: #1A2332; --gold: #C9A962; --gold-dark: #A0823E;
  --white: #F5F5F7; --gray-50: #FAFAFC; --gray-100: #EEEFF2;
  --gray-200: #D0D0D5; --gray-400: #888892; --gray-600: #555560;
  --gray-800: #2A2A35; --blue-accent: #3C64A0;
  --max-width: 780px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-serif: 'Songti SC', 'Noto Serif SC', 'STSong', 'SimSun', serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 17px; }
body {
  font-family: var(--font-sans); color: var(--gray-800);
  background: #FCFCFD; line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ===== Header ===== */
.site-header {
  background: var(--navy); padding: 1.1rem 0;
  position: sticky; top: 0; z-index: 100;
  border-bottom: 3px solid var(--gold);
  backdrop-filter: blur(10px);
}
.header-inner {
  max-width: var(--max-width); margin: 0 auto;
  padding: 0 1.5rem; display: flex;
  justify-content: space-between; align-items: center;
}
.site-title {
  font-size: 1.15rem; font-weight: 700; color: var(--white);
  text-decoration: none; letter-spacing: 0.03em;
}
.site-title span { color: var(--gold); font-weight: 400; opacity: 0.9; }
.site-nav a {
  color: var(--gray-200); text-decoration: none;
  margin-left: 1.8rem; font-size: 0.88rem;
  transition: color 0.2s; letter-spacing: 0.02em;
}
.site-nav a:hover, .site-nav a.active { color: var(--gold); }

/* ===== Hero (home) ===== */
.hero {
  background: linear-gradient(160deg, var(--navy) 0%, #1F2F45 100%);
  color: var(--white); padding: 5rem 1.5rem 4rem; text-align: center;
}
.hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 0.6rem; letter-spacing: 0.04em; }
.hero h1 span { color: var(--gold); }
.hero .subtitle {
  font-size: 1rem; color: var(--gray-200); max-width: 560px;
  margin: 0 auto 2rem; line-height: 1.7; font-weight: 400;
}
.hero .regions {
  display: flex; justify-content: center; flex-wrap: wrap;
  gap: 0.5rem; margin-bottom: 2rem;
}
.hero .region-tag {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15);
  color: var(--gold); padding: 0.35rem 1.1rem; border-radius: 20px;
  font-size: 0.82rem; letter-spacing: 0.04em;
}
.hero .stats {
  display: flex; justify-content: center; gap: 2.5rem;
  font-size: 0.82rem; color: var(--gray-400);
}

/* ===== Main content ===== */
.main-content {
  max-width: var(--max-width); margin: 0 auto; padding: 3rem 1.5rem;
}
.section-title {
  font-size: 1.25rem; font-weight: 800; color: var(--navy);
  margin-bottom: 1.5rem; padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--gold); letter-spacing: 0.03em;
}

/* ===== Article Cards ===== */
.article-card {
  display: block; background: #fff; border: 1px solid var(--gray-100);
  border-radius: 10px; padding: 1.4rem 1.6rem; margin-bottom: 0.9rem;
  text-decoration: none; transition: box-shadow 0.2s, transform 0.15s, border-color 0.2s;
}
.article-card:hover {
  box-shadow: 0 6px 28px rgba(0,0,0,0.07);
  transform: translateY(-2px); border-color: var(--gold);
}
.article-card .card-meta {
  font-size: 0.75rem; color: var(--gold-dark); font-weight: 700;
  margin-bottom: 0.3rem; text-transform: uppercase; letter-spacing: 0.06em;
}
.article-card .card-title {
  font-size: 1.08rem; font-weight: 700; color: var(--navy);
  margin-bottom: 0.35rem; line-height: 1.5;
}
.article-card .card-desc {
  font-size: 0.85rem; color: var(--gray-400); line-height: 1.55;
}

/* ===== Article Header ===== */
.article-header {
  max-width: var(--max-width); margin: 0 auto;
  padding: 3.5rem 1.5rem 1.5rem;
}
.article-region {
  font-size: 0.78rem; color: var(--gold-dark); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em; margin-bottom: 0.4rem;
}
.article-header h1 {
  font-size: 1.75rem; color: var(--navy); margin: 0.5rem 0;
  line-height: 1.45; font-weight: 800; letter-spacing: 0.02em;
}
.article-meta {
  font-size: 0.85rem; color: var(--gray-400); margin-top: 0.6rem;
  padding-bottom: 1.2rem; border-bottom: 1px solid var(--gray-100);
}

/* ===== Table of Contents ===== */
.article-toc {
  background: #fff; border: 1px solid var(--gray-100);
  border-left: 3px solid var(--gold); border-radius: 0 8px 8px 0;
  padding: 1.2rem 1.5rem; margin-bottom: 2.5rem;
}
.article-toc h2 {
  font-size: 0.95rem; font-weight: 700; color: var(--navy);
  margin-bottom: 0.8rem; padding: 0; border: none;
}
.article-toc ol { list-style: none; padding: 0; }
.article-toc li { margin-bottom: 0.35rem; line-height: 1.5; }
.article-toc .toc-h2 a {
  font-weight: 600; font-size: 0.88rem; color: var(--gray-800);
  text-decoration: none; transition: color 0.15s;
}
.article-toc .toc-h2 a:hover { color: var(--gold-dark); }
.article-toc .toc-h3 {
  padding-left: 1.2rem; font-size: 0.82rem;
}
.article-toc .toc-h3 a {
  color: var(--gray-400); text-decoration: none; transition: color 0.15s;
}
.article-toc .toc-h3 a:hover { color: var(--gold-dark); }

/* ===== Article Body ===== */
.article-body {
  max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem 3rem;
  font-family: var(--font-serif);
}

.article-body h2 {
  font-family: var(--font-sans);
  font-size: 1.25rem; font-weight: 800; color: var(--navy);
  margin: 2.8rem 0 0.9rem; padding-top: 0.6rem;
  padding-left: 0.9rem; border-left: 4px solid var(--gold);
  line-height: 1.4; letter-spacing: 0.02em;
}
.article-body h2:first-of-type { margin-top: 0; }

.article-body h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem; font-weight: 700; color: var(--gray-600);
  margin: 2rem 0 0.6rem; line-height: 1.5;
}

.article-body p {
  margin-bottom: 0.9rem; text-indent: 2em; line-height: 1.9;
  font-size: 1.02rem;
}
.article-body p:first-of-type { text-indent: 0; }

/* Lists */
.article-body ul, .article-body ol {
  margin: 0.8rem 0 1.2rem 1.8rem; line-height: 1.8;
}
.article-body li {
  margin-bottom: 0.4rem; padding-left: 0.3rem;
  font-size: 0.98rem;
}
.article-body ol { list-style-type: decimal; }
.article-body ul { list-style-type: disc; }

/* Strong / emphasis */
.article-body strong { color: var(--navy); font-weight: 700; }
.article-body em { color: var(--gray-600); }

/* Blockquote (for important notes) */
.article-body blockquote {
  background: #F8F6F0; border-left: 4px solid var(--gold);
  margin: 1.5rem 0; padding: 1rem 1.5rem;
  border-radius: 0 6px 6px 0; font-style: italic;
  color: var(--gray-600);
}

/* Separator */
.article-body hr {
  border: none; border-top: 1px solid var(--gray-100);
  margin: 2rem 0;
}

/* ===== About ===== */
.about-hero {
  background: var(--navy); color: var(--white);
  padding: 4rem 1.5rem; text-align: center;
}
.about-hero h1 { font-size: 1.6rem; font-weight: 800; margin-bottom: 0.4rem; }
.about-content {
  max-width: var(--max-width); margin: 0 auto; padding: 2rem 1.5rem;
}
.about-content h2 {
  font-size: 1.2rem; font-weight: 800; color: var(--navy);
  margin: 2rem 0 0.8rem; padding-left: 0.8rem;
  border-left: 3px solid var(--gold);
}
.about-content ul { margin-left: 1.5rem; line-height: 1.9; }
.about-content li { margin-bottom: 0.4rem; }

/* ===== Footer ===== */
.site-footer {
  background: var(--navy); color: var(--gray-400);
  text-align: center; padding: 2rem 1.5rem; font-size: 0.84rem;
  margin-top: 4rem; line-height: 1.8;
}
.site-footer a { color: var(--gold); text-decoration: none; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  html { font-size: 15px; }
  .hero { padding: 3rem 1rem 2rem; }
  .hero h1 { font-size: 1.5rem; }
  .header-inner { flex-direction: column; gap: 0.5rem; }
  .site-nav a { margin-left: 1rem; font-size: 0.82rem; }
  .hero .stats { flex-direction: column; gap: 0.3rem; align-items: center; }
  .article-header { padding-top: 2rem; }
  .article-header h1 { font-size: 1.35rem; }
  .article-body { padding: 0 1rem 2rem; }
  .article-body h2 { font-size: 1.1rem; margin-left: -0.5rem; }
  .article-toc { margin-left: -0.5rem; margin-right: -0.5rem; }
}

@media (max-width: 400px) {
  html { font-size: 14px; }
  .site-nav a { margin-left: 0.6rem; font-size: 0.78rem; }
}

/* ===== TL;DR Summary ===== */
.article-summary {
  background: linear-gradient(135deg, #F8F6F0, #F0EFE8);
  border-left: 4px solid var(--gold);
  padding: 1rem 1.4rem; margin-bottom: 2rem;
  border-radius: 0 8px 8px 0; font-size: 0.95rem;
  color: var(--gray-600); line-height: 1.7;
  font-style: italic;
}

/* ===== Related Articles ===== */
.related-articles {
  margin-top: 3rem; padding-top: 1.5rem;
  border-top: 1px solid var(--gray-100);
}
.related-articles h2 {
  font-family: var(--font-sans); font-size: 1.05rem;
  font-weight: 700; color: var(--navy);
  margin-bottom: 0.8rem; padding: 0; border: none;
}
.related-articles ul { list-style: none; padding: 0; }
.related-articles li { margin-bottom: 0.4rem; }
.related-articles a {
  color: var(--blue-accent); text-decoration: none;
  font-size: 0.92rem; transition: color 0.15s;
}
.related-articles a:hover { color: var(--gold-dark); }

/* ===== Print ===== */
@media print {
  .site-header, .site-footer, .hero, .article-toc { display: none; }
  .article-body { max-width: 100%; font-size: 12pt; }
}