@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,700&family=Merriweather:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --color-bg: #f5f5f4;
  --color-text: #1c1917;
  --color-text-secondary: #57534e;
  --color-accent: #1a6fc4;
  --color-accent-hover: #14538f;
  --color-accent-light: #e8f1fa;
  --color-border: #e0dedb;
  --color-card-bg: #ffffff;
  --color-tag-bg: #e8f1fa;
  --color-tag-text: #14538f;
  --color-success: #16a34a;
  --color-footer-bg: #1c1917;
  --color-footer-text: #a8a29e;
  --max-width: 720px;
  --max-width-wide: 960px;
}

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

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* === TOP BAR === */
.top-bar {
  background: var(--color-footer-bg);
  color: #d6d3d1;
  font-size: 0.78rem;
  padding: 0.45rem 1.5rem;
  text-align: center;
  letter-spacing: 0.01em;
}

.top-bar span { opacity: 0.7; }

/* === HEADER === */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-card-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.header-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-text);
}

.site-logo img {
  height: 42px;
  width: auto;
  border-radius: 3px;
}

.site-logo-text {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.2;
}

.site-logo-text strong {
  display: block;
  font-size: 0.92rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-nav { display: flex; gap: 1.75rem; align-items: center; }

.site-nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.site-nav a:hover { color: var(--color-accent); }

.site-nav a.active {
  color: var(--color-accent);
}

.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -0.75rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* === MAIN CONTENT === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-wide {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === HOMEPAGE === */
.hero {
  padding: 3.5rem 0 1rem;
  text-align: center;
}

.hero h1 {
  font-family: 'Merriweather', Georgia, serif;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.hero p {
  color: var(--color-text-secondary);
  font-size: 1.02rem;
  max-width: 540px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.articles-grid {
  display: grid;
  gap: 1rem;
  padding-bottom: 3rem;
}

.article-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem 2rem;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
  display: block;
}

.article-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-1px);
  border-color: var(--color-accent);
}

.article-card-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}

.article-card .tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.article-card .reading-time {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.article-card h2 {
  font-family: 'Merriweather', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.4rem;
}

.article-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.article-meta {
  margin-top: 0.85rem;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-meta .dot { opacity: 0.4; }

/* === SIDEBAR INFO === */
.home-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  padding-bottom: 4rem;
}

.sidebar {
  padding-top: 3.5rem;
}

.sidebar-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.sidebar-card h3 {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.sidebar-card p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.sidebar-card .badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: #f0fdf4;
  color: var(--color-success);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  margin-bottom: 0.5rem;
}

.sidebar-card .badge::before {
  content: '●';
  font-size: 0.5rem;
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.sidebar-tags a {
  background: var(--color-bg);
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  text-decoration: none;
  border: 1px solid var(--color-border);
  transition: all 0.2s;
}

.sidebar-tags a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* === ARTICLE PAGE === */
.article-header {
  padding: 3rem 0 2rem;
}

.article-header .tag {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.85rem;
}

.article-header h1 {
  font-family: 'Merriweather', Georgia, serif;
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.article-header .meta {
  color: var(--color-text-secondary);
  font-size: 0.86rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.article-header .author {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
}

.article-body {
  padding-bottom: 2rem;
}

.article-body p {
  margin-bottom: 1.4rem;
  font-size: 1rem;
  line-height: 1.78;
}

.article-body h2 {
  font-family: 'Merriweather', Georgia, serif;
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  line-height: 1.35;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
}

.article-body h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem;
}

.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(26,111,196,0.3);
  transition: all 0.2s;
}

.article-body a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: var(--color-accent-hover);
}

.article-body ul, .article-body ol {
  margin: 0 0 1.4rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.article-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--color-accent-light);
  border-radius: 0 6px 6px 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.article-body strong { font-weight: 700; }

/* === RELATED ARTICLES === */
.related-articles {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0 3rem;
}

.related-articles h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.related-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s;
}

.related-card:hover { border-color: var(--color-accent); }

.related-card h4 {
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.3rem;
}

.related-card span {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

/* === ABOUT PAGE === */
.about-content {
  padding: 3rem 0 4rem;
}

.about-content h1 {
  font-family: 'Merriweather', Georgia, serif;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.about-content p {
  margin-bottom: 1.3rem;
  line-height: 1.78;
}

.about-timeline {
  margin: 2rem 0;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-border);
}

.about-timeline .event {
  margin-bottom: 1.5rem;
  position: relative;
}

.about-timeline .event::before {
  content: '';
  position: absolute;
  left: -1.75rem;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 2px solid var(--color-card-bg);
}

.about-timeline .event strong {
  display: block;
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-bottom: 0.15rem;
}

.about-timeline .event p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

/* === FOOTER === */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 2.5rem 0 2rem;
  font-size: 0.84rem;
}

.footer-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
}

.footer-col h4 {
  color: #e7e5e4;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.footer-col p {
  line-height: 1.55;
  margin-bottom: 0.5rem;
}

.footer-col a {
  color: var(--color-footer-text);
  text-decoration: none;
  display: block;
  margin-bottom: 0.4rem;
  transition: color 0.2s;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 0;
  border-top: 1px solid #292524;
  margin-top: 2rem;
  text-align: center;
  font-size: 0.78rem;
  opacity: 0.7;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  html { font-size: 16px; }
  .hero h1 { font-size: 1.6rem; }
  .article-header h1 { font-size: 1.65rem; }
  .header-inner { flex-direction: column; gap: 0.6rem; }
  .site-nav { gap: 1rem; flex-wrap: wrap; justify-content: center; }
  .article-card { padding: 1.35rem 1.5rem; }
  .home-layout { grid-template-columns: 1fr; }
  .sidebar { padding-top: 0; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .article-header .meta { flex-direction: column; align-items: flex-start; gap: 0.4rem; }
}