/* ============================================
   未赜颐和 - 品牌基础站样式
   第一阶段：静态内容展示站
   品牌五色：宣纸白/墨黑/朱砂红/赭石/深灰
   ============================================ */

/* --- 1. CSS Variables & Reset --- */
:root {
  --paper: #F5F1E8;
  --ink: #2C2C2C;
  --vermillion: #C43C3C;
  --vermillion-dark: #A83232;
  --ochre: #8B4513;
  --gray: #5A5A5A;
  --gray-light: #9A9A9A;
  --border: #E0D8CC;
  --card-bg: #FDFAF5;

  --font-heading: 'Ma Shan Zheng', 'ZCOOL KuaiLe', serif;
  --font-body: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;
  --font-ui: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', sans-serif;

  --max-width: 1080px;
  --section-gap: clamp(60px, 8vw, 120px);
  --section-gap-mobile: 60px;

  /* shadow scale (soft-skill) */
  --shadow-sm: 0 1px 3px rgba(44,44,44,0.06);
  --shadow-md: 0 4px 16px rgba(44,44,44,0.08);
  --shadow-lg: 0 8px 32px rgba(44,44,44,0.10);

  /* radius scale */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-pill: 100px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 18px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--paper);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--vermillion); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* --- 2. Typography --- */
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 400; line-height: 1.4; }
h1 { font-size: 3.2rem; letter-spacing: 0.15em; }
h2 { font-size: 2rem; letter-spacing: 0.08em; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }

.serif { font-family: var(--font-body); }
.sans { font-family: var(--font-ui); }

blockquote {
  border-left: 3px solid var(--ochre);
  padding: 0.8em 1.2em;
  margin: 1.5em 0;
  background: rgba(139, 69, 19, 0.04);
  font-style: italic;
  color: var(--gray);
}

/* --- 3. Layout --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--section-gap) 0; }

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-header h2 {
  margin-bottom: 0.15em;
}
.section-header p {
  color: var(--gray);
  font-size: 1rem;
}

/* Horizontal divider */
.divider {
  display: flex; align-items: center; justify-content: center;
  gap: 1em; margin: 2em 0;
  color: var(--ochre);
}
.divider::before, .divider::after {
  content: ''; display: block;
  width: 60px; height: 1px;
  background: var(--border);
}

/* --- 4. Trigram Icon System (replaces emoji) --- */
.trigram-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  color: var(--vermillion);
  opacity: 0.75;
  line-height: 1;
}
.trigram-icon.lg { font-size: 3.4rem; }

/* --- 5. Header & Navigation --- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(245, 241, 232, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: 0 2px 20px rgba(44, 44, 44, 0.06); }

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max-width); margin: 0 auto;
  padding: 0 24px; height: 64px;
}

.logo {
  display: flex; align-items: center; gap: 0.4em;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--ink);
  letter-spacing: 0.1em;
  white-space: nowrap;
}
.logo-icon {
  font-size: 1.3rem;
  color: var(--vermillion);
  opacity: 0.8;
}

.nav-links { display: flex; gap: 2em; }
.nav-links a {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  color: var(--gray);
  letter-spacing: 0.04em;
  position: relative;
  padding: 0.3em 0;
}
.nav-links a::after {
  content: ''; position: absolute;
  bottom: 0; left: 0; width: 0; height: 1px;
  background: var(--vermillion);
  transition: width 0.3s;
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--ink); }

.nav-right { display: flex; align-items: center; gap: 0.8em; }

.menu-toggle {
  display: none; background: none; border: none;
  cursor: pointer; padding: 8px; color: var(--ink);
}
.menu-toggle span {
  display: block; width: 20px; height: 1.5px;
  background: var(--ink); margin: 4px 0;
  transition: transform 0.3s, opacity 0.3s;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 4px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -3px); }

/* --- 6. Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 120px 24px 100px;
}

/* Ink wash background (CSS-only) */
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(139, 69, 19, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 30%, rgba(196, 60, 60, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse 70% 40% at 50% 80%, rgba(44, 44, 44, 0.05) 0%, transparent 50%);
}

.hero-symbol {
  font-size: 3.5rem;
  color: var(--ochre);
  opacity: 0.25;
  margin-bottom: 1.5rem;
  position: relative; z-index: 1;
}

.hero-content { position: relative; z-index: 1; max-width: 680px; }

.hero h1 {
  color: var(--ink);
  margin-bottom: 0.5em;
  line-height: 1.3;
}

.hero .subtitle {
  font-family: var(--font-body);
  font-size: 1.1rem;
  color: var(--gray);
  line-height: 1.9;
  margin-bottom: 2.5em;
}

.hero-actions { display: flex; gap: 1em; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.7em 2.2em;
  font-family: var(--font-ui);
  font-size: 0.92rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  letter-spacing: 0.04em;
  border: none;
}
.btn-primary {
  background: var(--vermillion);
  color: #fff;
}
.btn-primary:hover {
  background: var(--vermillion-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(196, 60, 60, 0.2);
}
.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

/* --- 7. Articles Grid (Featured on Home) --- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.article-card {
  background: var(--card-bg);
  border-radius: 6px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(44, 44, 44, 0.07);
}

/* Category-colored ink-wash image placeholders */
.article-card-image {
  height: 200px;
  position: relative;
}
.article-card-image.cat-spring {
  background: linear-gradient(160deg, #E8E4D8 0%, #D4CFC0 40%, #C5C8B0 100%);
}
.article-card-image.cat-balance {
  background: linear-gradient(160deg, #EBE7DD 0%, #DDD8CC 40%, #D0CBC0 100%);
}
.article-card-image.cat-rest {
  background: linear-gradient(160deg, #E6E2D6 0%, #D8D3C4 40%, #C8C0B2 100%);
}
/* Subtle ink dot pattern */
.article-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(44,44,44,0.03) 0%, transparent 50%),
    radial-gradient(circle at 65% 60%, rgba(139,69,19,0.04) 0%, transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(196,60,60,0.02) 0%, transparent 35%);
}

.article-card-body {
  padding: 1.5rem;
}

.article-card .category {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--vermillion);
  letter-spacing: 0.08em;
}
.article-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin: 0.4em 0;
  line-height: 1.5;
}
.article-card h3 a { color: var(--ink); }
.article-card h3 a:hover { color: var(--vermillion); }
.article-card .excerpt {
  color: var(--gray);
  font-size: 0.88rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card .meta {
  display: flex; gap: 1em; align-items: center;
  margin-top: 1em;
  font-family: var(--font-ui);
  font-size: 0.73rem;
  color: var(--gray-light);
}

.articles-cta {
  text-align: center;
  margin-top: 3rem;
}

/* --- 8. Content Pillars --- */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.pillar-card {
  padding: 2.5rem 2rem;
  background: var(--card-bg);
  border-radius: 6px;
  border-top: 3px solid var(--vermillion);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: transform 0.3s, box-shadow 0.3s;
}
.pillar-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(44, 44, 44, 0.07);
}

.pillar-card .gua {
  font-size: 2rem;
  color: var(--vermillion);
  opacity: 0.8;
  margin-bottom: 0.6em;
}
.pillar-card h3 { font-family: var(--font-heading); margin-bottom: 0.2em; }
.pillar-card .classical {
  font-family: var(--font-heading);
  color: var(--ochre);
  font-size: 0.88rem;
  margin-bottom: 0.8em;
}
.pillar-card p {
  color: var(--gray);
  font-size: 0.92rem;
  margin-bottom: 1.2em;
}
.pillar-card .link {
  font-family: var(--font-ui);
  font-size: 0.83rem;
  color: var(--vermillion);
  letter-spacing: 0.04em;
}

/* --- 9. Brand Philosophy --- */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.philosophy-card {
  text-align: center;
  padding: 2.5rem 2rem;
  background: var(--card-bg);
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: transform 0.3s, box-shadow 0.3s;
}
.philosophy-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(44, 44, 44, 0.07);
}

.philosophy-card .trigram-icon {
  margin-bottom: 0.8rem;
}
.philosophy-card h3 {
  font-family: var(--font-heading);
  color: var(--ink);
  margin-bottom: 0.4em;
}
.philosophy-card p {
  color: var(--gray);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* --- 10. Article List Page --- */
.page-header {
  padding: 120px 24px 60px;
  text-align: center;
}

.page-header h1 { margin-bottom: 0.3em; }
.page-header .description {
  color: var(--gray);
  max-width: 560px;
  margin: 0 auto;
  font-size: 0.95rem;
}

.filter-bar {
  display: flex; gap: 0.5em; justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  max-width: var(--max-width);
  margin-left: auto; margin-right: auto;
  padding: 0 24px;
}
.filter-tag {
  padding: 0.35em 1.1em;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--gray);
  cursor: pointer;
  transition: all 0.3s;
  background: transparent;
}
.filter-tag:hover, .filter-tag.active {
  border-color: var(--vermillion);
  color: var(--vermillion);
  background: rgba(196, 60, 60, 0.04);
}

.article-list {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.article-list-item {
  display: flex; gap: 1.5rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--border);
  transition: transform 0.3s;
}
.article-list-item:hover { transform: translateX(4px); }

.article-list-item .date {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--gray-light);
  white-space: nowrap;
  padding-top: 0.35em;
  min-width: 85px;
}

.article-list-item .info { flex: 1; }
.article-list-item .info .category {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--vermillion);
  letter-spacing: 0.08em;
}
.article-list-item .info h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin: 0.1em 0;
}
.article-list-item .info h3 a { color: var(--ink); }
.article-list-item .info h3 a:hover { color: var(--vermillion); }
.article-list-item .info .excerpt {
  color: var(--gray);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* --- 11. Article Detail --- */
.article-detail {
  max-width: 720px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.article-detail .breadcrumb {
  font-family: var(--font-ui);
  font-size: 0.83rem;
  color: var(--gray-light);
  margin-bottom: 2rem;
}
.article-detail .breadcrumb a { color: var(--gray); }
.article-detail .breadcrumb a:hover { color: var(--vermillion); }

.article-header { margin-bottom: 2.5rem; }
.article-header .category-tag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.73rem;
  color: var(--vermillion);
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}
.article-header h1 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  line-height: 1.4;
  margin-bottom: 0.4em;
}
.article-header .meta-detail {
  display: flex; gap: 1.5em; align-items: center;
  font-family: var(--font-ui);
  font-size: 0.83rem;
  color: var(--gray-light);
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

/* AI标识 - subtle, compliant */
.ai-note {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--gray-light);
  margin-bottom: 2rem;
  padding: 0.5em 0;
  border-bottom: 1px dotted var(--border);
  letter-spacing: 0.03em;
}

.article-body { line-height: 1.9; }

.article-body h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin: 2.5em 0 0.7em;
  letter-spacing: 0.06em;
}
.article-body h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin: 2em 0 0.5em;
}
.article-body p { margin-bottom: 1.2em; }
.article-body ul, .article-body ol {
  margin: 0.8em 0 1.5em 1.5em;
}
.article-body li { margin-bottom: 0.5em; }

.article-body .highlight {
  color: var(--vermillion);
  font-weight: 500;
}

.article-body .source-ref {
  font-size: 0.83rem;
  color: var(--gray-light);
  margin-top: -0.5em;
  margin-bottom: 1.5em;
}

/* FAQ section for GEO */
.faq-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.faq-section h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
}
.faq-item {
  margin-bottom: 1.5rem;
}
.faq-item .q {
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.3em;
}
.faq-item .a {
  color: var(--gray);
  line-height: 1.8;
}

/* Disclaimer box */
.disclaimer {
  margin-top: 3rem;
  padding: 1rem 1.2rem;
  background: rgba(139, 69, 19, 0.03);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--gray);
  line-height: 1.7;
}
.disclaimer strong { color: var(--ochre); }

/* Article nav */
.article-nav {
  display: flex; justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-ui);
  font-size: 0.88rem;
}
.article-nav a { color: var(--gray); }
.article-nav a:hover { color: var(--vermillion); }

/* --- 12. About Page --- */
.about-section {
  max-width: 720px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.about-section .brand-name {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  letter-spacing: 0.12em;
  text-align: center;
  margin-bottom: 0.2em;
}
.about-section .brand-sub {
  text-align: center;
  color: var(--gray);
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

.about-block { margin-bottom: 2.5rem; }
.about-block h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.about-block p {
  color: var(--gray);
  margin-bottom: 0.8em;
}

.about-block .classical-quote {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--ochre);
  text-align: center;
  padding: 2rem 0;
  letter-spacing: 0.08em;
}

/* --- 13. Footer --- */
.site-footer {
  background: var(--ink);
  color: rgba(245, 241, 232, 0.7);
  padding: 56px 24px 36px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 1.8rem;
}

.footer-brand .logo { color: var(--paper); margin-bottom: 0.6rem; }
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.45);
}

.footer-links h4 {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--paper);
  letter-spacing: 0.04em;
  margin-bottom: 0.8em;
}
.footer-links a {
  display: block;
  font-size: 0.83rem;
  color: rgba(245, 241, 232, 0.5);
  margin-bottom: 0.4em;
  transition: color 0.3s;
}
.footer-links a:hover { color: var(--vermillion); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(245, 241, 232, 0.08);
  display: flex; justify-content: space-between;
  align-items: center;
  flex-wrap: wrap; gap: 0.8em;
  font-size: 0.78rem;
  color: rgba(245, 241, 232, 0.3);
}

/* --- 14. Empty state --- */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--gray-light);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.3; }

/* --- 15. Responsive --- */
@media (max-width: 1023px) {
  html { font-size: 16px; }
  h1 { font-size: 2.4rem; }
  h2 { font-size: 1.7rem; }

  .philosophy-grid,
  .pillars,
  .articles-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
  html { font-size: 15px; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  :root { --section-gap: 60px; }

  /* Mobile nav */
  .nav-links {
    display: none;
    position: fixed;
    top: 64px; left: 0; right: 0; bottom: 0;
    background: rgba(245, 241, 232, 0.98);
    backdrop-filter: blur(8px);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 3rem 2rem;
    gap: 2rem;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.05rem; }

  .menu-toggle { display: block; }
  .nav-right { gap: 0; }

  .philosophy-grid,
  .pillars,
  .articles-grid { grid-template-columns: 1fr; }

  .hero { padding: 100px 20px 80px; }
  .hero h1 { font-size: 2.2rem; }
  .hero .subtitle { font-size: 0.95rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 260px; text-align: center; }

  .article-list-item { flex-direction: column; gap: 0.4rem; }
  .article-list-item .date { padding-top: 0; }

  .article-detail { padding-top: 100px; }
  .article-header h1 { font-size: 1.7rem; }

  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* --- 16. Utility classes --- */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mt-4 { margin-top: 4rem; }
.mb-2 { margin-bottom: 2rem; }

/* ---- Quick Pills (Category Links) ---- */
.quick-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}
.quick-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--ink);
  transition: all var(--transition-fast);
}
.quick-pill:hover {
  border-color: var(--vermillion);
  background: rgba(196,60,60,0.04);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.quick-pill .qp-icon { font-size: 1.1rem; color: var(--vermillion); opacity: 0.7; }
.quick-pill .qp-num { font-size: 0.7rem; color: var(--gray-light); font-family: var(--font-ui); }

/* ---- Article Cards (with shadow system) ---- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.article-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-fast);
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--vermillion);
}

/* ---- Section Alternate ---- */
.section-alt { background: rgba(245,241,232,0.5); }

@media (max-width: 1023px) { .articles-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 767px)  { .articles-grid { grid-template-columns: 1fr; } .quick-pill { padding: 0.5rem 1rem; font-size: 0.85rem; } }

/* ---- Related Articles ---- */
.related-articles { margin-top: 2rem; padding: 1.5rem; background: var(--card-bg); border-radius: 6px; border: 1px solid var(--border); }
.related-articles h3 { font-family: var(--font-heading); font-size: 1.1rem; margin-bottom: 1rem; }
.related-articles ul { display: flex; gap: 1rem; flex-wrap: wrap; }
.related-articles li { list-style: none; }
.related-articles a { color: var(--vermillion); font-size: 0.9rem; }
.related-articles a:hover { text-decoration: underline; }

/* ---- Source Note ---- */
.source-note {
  margin-top: 0.5rem;
  padding: 0.6rem 1rem;
  font-size: 0.78rem;
  color: var(--gray-light);
  border-top: 1px dotted var(--border);
  line-height: 1.6;
}

/* ---- Reading Time ---- */
.read-time { font-size: 0.78rem; color: var(--gray-light); font-family: var(--font-ui); }

/* ---- WeChat QR ---- */
.footer-wechat { min-width: 140px; }
.wechat-qr {
  max-width: 30%;
  height: auto;
  display: block;
  margin-bottom: 0.5rem;
  border-radius: 6px;
  border: 1px solid rgba(245,241,232,0.15);
}
.wechat-id {
  font-size: 0.75rem;
  color: rgba(245,241,232,0.45);
  font-family: var(--font-ui);
  word-break: break-all;
}

/* ---- Nav Scroll Effect ---- */
.site-header {
  transition: background 0.3s, box-shadow 0.3s;
}
.site-header.scrolled {
  background: rgba(245,241,232,0.96);
  box-shadow: 0 2px 20px rgba(44,44,44,0.06);
}
.site-header .logo {
  transition: font-size 0.3s;
}
.site-header.scrolled .logo { font-size: 1.3rem; }

/* ---- Article Card Meta ---- */
.article-card .category { font-size: 0.72rem; color: var(--vermillion); letter-spacing: 0.08em; font-family: var(--font-ui); }
.article-card h3 { font-family: var(--font-heading); font-size: 1.1rem; margin: 0.4em 0; line-height: 1.4; }
.article-card h3 a { color: var(--ink); text-decoration: none; }
.article-card h3 a:hover { color: var(--vermillion); }
.article-card .excerpt { color: var(--gray); font-size: 0.88rem; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.article-card .meta { font-size: 0.73rem; color: var(--gray-light); font-family: var(--font-ui); margin-top: 0.8em; }
.article-card-body { padding: 1.3rem; }