:root {
  --color-bg: #f5f7fb;
  --color-panel: #ffffff;
  --color-border: #dfe4ee;
  --color-text: #0f172a;
  --color-muted: #4b5563;
  --color-accent: #2563eb;
  --color-shadow: rgba(15, 23, 42, 0.08);
  --gap: 1.5rem;
  --radius-lg: 1.5rem;
  --radius-sm: 0.9rem;
  font-family: 'Inter', 'IBM Plex Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 1rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page__content {
  flex: 1;
}

header.hero {
  padding: 4rem 2rem 3rem;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

.hero__content {
  max-width: 960px;
  margin: 0 auto;
}

.hero__subtitle {
  text-transform: uppercase;
  letter-spacing: 0.3rem;
  font-size: 0.7rem;
  margin-bottom: 0.8rem;
  color: var(--color-muted);
}

.hero__title {
  font-size: clamp(2.8rem, 4vw, 4rem);
  margin: 0 0 0.5rem;
  font-weight: 600;
  color: var(--color-text);
}

.hero__lead {
  max-width: 640px;
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-muted);
  margin-bottom: 1.5rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.hero__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1.2rem;
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid var(--color-border);
  background: #f9fafb;
}

.hero__link:hover {
  background: #eef2ff;
}

.posts {
  padding: 2rem 2rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
}

.posts__header {
  margin-bottom: 1.5rem;
}

.posts__header h2 {
  margin: 0;
  font-size: 1.75rem;
}

.posts__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--gap);
}

.post-card {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.07);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.post-card__date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.post-card__day {
  font-size: 1.4rem;
}

.post-card__month {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}

.post-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.post-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.post-card__excerpt {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.6;
}

.post-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.post-card__tags span {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  background: #f4f6fb;
}

.site-footer {
  padding: 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  background: #fff;
}

.post-page {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto 4rem;
  padding: 2rem 0 0;
}

.post-header {
  position: relative;
  background: var(--color-panel);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 3rem;
  box-shadow: 0 30px 60px var(--color-shadow);
}

.post-header__content {
  max-width: 860px;
}

.post-header__date {
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin: 0;
  color: var(--color-muted);
}

.post-header__title {
  font-size: clamp(2.8rem, 4vw, 4.5rem);
  margin: 0.6rem 0;
  font-weight: 700;
}

.post-header__subtitle {
  font-size: 1.05rem;
  margin: 0;
  color: var(--color-muted);
}

.post-header__summary {
  margin-top: 1rem;
  margin-bottom: 0;
  color: var(--color-text);
  font-size: 1rem;
}

.post-header__tags {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.post-header__tags span {
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: #eff3ff;
  border: 1px solid #d0d7ff;
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.post-header__nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
  font-size: 0.95rem;
}

.post-header__nav a {
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: #f9fbff;
  color: var(--color-text);
}

.post-header__nav a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.post-body {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 3fr) minmax(240px, 1fr);
  margin-top: 2rem;
}

.post-content {
  background: var(--color-panel);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 2.5rem;
  box-shadow: 0 25px 45px rgba(15, 23, 42, 0.06);
}

.post-content h2,
.post-content h3,
.post-content h4 {
  margin-top: 2rem;
  color: var(--color-text);
  font-weight: 600;
}

.post-content p {
  color: var(--color-text);
  margin: 1rem 0;
}

.post-content ul,
.post-content ol {
  padding-left: 1.5rem;
  color: var(--color-text);
}

.post-content li + li {
  margin-top: 0.5rem;
}

.post-content strong {
  color: var(--color-text);
}

.post-content code {
  font-family: 'Fira Code', 'SFMono-Regular', Menlo, Consolas, monospace;
  background: #f2f4ff;
  padding: 0.15rem 0.4rem;
  border-radius: 0.4rem;
}

.post-content pre {
  padding: 1rem;
  background: #0f172a;
  color: #f8fafc;
  border-radius: 0.9rem;
  overflow-x: auto;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.post-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.share-card,
.author-card {
  background: var(--color-panel);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  box-shadow: 0 20px 35px rgba(15, 23, 42, 0.05);
}

.share-card h3,
.author-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.share-card__actions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.share-card__actions a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.share-card__actions a i {
  font-size: 1rem;
  color: var(--color-accent);
}

.share-card__actions a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.author-card__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  color: var(--color-muted);
  margin: 0;
}

.author-card__name {
  margin: 0.25rem 0 0.4rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.author-card__bio {
  margin: 0 0 1rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.author-card__contact {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}

.post-footer-note {
  margin-top: 2rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

@media (max-width: 960px) {
  .post-body {
    grid-template-columns: 1fr;
  }

  .post-header__nav {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  header.hero {
    padding: 3rem 1rem 2rem;
  }

  .hero__actions {
    flex-direction: column;
  }

  .post-header {
    padding: 2rem;
  }

  .post-content {
    padding: 2rem;
  }
}