:root {
  --bg: #050505;
  --bg-secondary: #0A0A0A;
  --grid: #1A1A1A;
  --text: #E0E0E0;
  --text-highlight: #C0C0C0;
  --text-dim: #8E8E8E;
  --border: #1A1A1A;
  --border-bright: #3A3A3A;
  --accent: #C0C0C0;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.8;
  letter-spacing: 0.01em;
}

.mono {
  font-family: "JetBrains Mono", "Roboto Mono", monospace;
}

.app-shell {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    linear-gradient(rgba(26, 26, 26, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 26, 26, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center center;
}

.app-shell::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(200, 200, 200, 0.02) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.ambient {
  position: fixed;
  width: 40vw;
  height: 40vw;
  border-radius: 999px;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0;
}

.home-shell {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.2rem 5rem;
}

.home-header {
  text-align: center;
  padding: 4rem 1rem 3rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.home-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text-dim), transparent);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.4em;
  font-size: 0.7rem;
  color: var(--text-dim);
  font-family: "JetBrains Mono", monospace;
  margin-bottom: 1rem;
}

.home-title {
  margin: 0.5rem 0;
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  color: var(--text-highlight);
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.2;
}

.home-tagline {
  margin: 1rem auto 0;
  max-width: 600px;
  color: var(--text-dim);
  font-style: italic;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  font-family: "Inter", sans-serif;
}

.home-sub {
  max-width: 680px;
  margin: 1.5rem auto 0;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

.category-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0;
}

.category-btn {
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--bg-secondary);
  color: var(--text-dim);
  padding: 0.4rem 0.9rem;
  font-size: 0.75rem;
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.category-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(192, 192, 192, 0.05), transparent);
  transition: left 0.4s ease;
}

.category-btn:hover::before,
.category-btn.active::before {
  left: 100%;
}

.category-btn.active,
.category-btn:hover {
  border-color: var(--text-dim);
  color: var(--text-highlight);
  background: rgba(192, 192, 192, 0.05);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.post-card-link {
  text-decoration: none;
}

.search-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
  align-items: center;
}

.search-input {
  flex: 1;
  min-width: 280px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text);
  border-radius: 2px;
  padding: 0.7rem 0.9rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  transition: border-color 0.25s ease;
}

.search-input::placeholder {
  color: var(--text-dim);
  opacity: 0.6;
}

.search-input:focus {
  outline: none;
  border-color: var(--text-dim);
}

.result-count {
  color: var(--text-dim);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}

.post-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  animation: cardEnter 0.5s ease forwards;
}

.post-card::before,
.post-card::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-color: var(--border);
  border-style: solid;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.post-card::before {
  top: -1px;
  left: -1px;
  border-width: 1px 0 0 1px;
}

.post-card::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 1px 1px 0;
}

.post-card:hover::before,
.post-card:hover::after {
  opacity: 1;
  border-color: var(--text-dim);
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--text-dim);
  box-shadow: 0 0 30px rgba(192, 192, 192, 0.03), 0 10px 40px rgba(0, 0, 0, 0.4);
}

@keyframes cardEnter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-card:nth-child(1) { animation-delay: 0.05s; }
.post-card:nth-child(2) { animation-delay: 0.1s; }
.post-card:nth-child(3) { animation-delay: 0.15s; }
.post-card:nth-child(4) { animation-delay: 0.2s; }
.post-card:nth-child(5) { animation-delay: 0.25s; }
.post-card:nth-child(6) { animation-delay: 0.3s; }

.post-card h2 {
  color: var(--text-highlight);
  margin: 0.5rem 0 0.7rem;
  font-size: 1.1rem;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.post-card p {
  color: var(--text-dim);
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
}

.card-category {
  color: var(--text-dim);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.card-meta {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  color: var(--text-dim);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

.post-shell {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.2rem 4rem;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--text-dim), var(--text-highlight), var(--text-dim));
  z-index: 999;
  box-shadow: 0 0 10px rgba(192, 192, 192, 0.3);
}

.back-btn {
  margin-top: 1.5rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 2px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all 0.25s ease;
}

.back-btn:hover {
  border-color: var(--text-dim);
  color: var(--text-highlight);
}

.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 2px;
  display: grid;
  place-items: center;
  color: var(--text-dim);
  text-decoration: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  opacity: 0;
  transform: translateY(12px);
  transition: all 0.25s ease;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--text-dim);
  color: var(--text-highlight);
}

.hero {
  min-height: 55vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  border-bottom: 1px solid var(--border);
  padding: 3rem 0;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 150px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text-dim), transparent);
}

.hero-title {
  margin: 1rem 0 0.8rem;
  font-size: clamp(1.8rem, 6vw, 3.8rem);
  color: var(--text-highlight);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: 0.02em;
  max-width: 800px;
}

.hero-sub {
  color: var(--text-dim);
  max-width: 650px;
  line-height: 1.7;
}

.hero-meta {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.2rem;
  color: var(--text-dim);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.markdown-body {
  padding: 2.5rem 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

.markdown-body > *:first-child {
  margin-top: 0;
}

.markdown-body > *:last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--text-highlight);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 1.8em;
  margin-bottom: 0.8em;
  letter-spacing: 0.02em;
}

.markdown-body h1 {
  font-size: 2rem;
  font-weight: 700;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border);
}

.markdown-body h2 {
  font-size: 1.5rem;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.markdown-body h3 {
  font-size: 1.2rem;
  color: var(--text-highlight);
}

.markdown-body h4 {
  font-size: 1rem;
}

.markdown-body p {
  margin-top: 0;
  margin-bottom: 1em;
}

.markdown-body a {
  color: var(--text-highlight);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.2s ease;
}

.markdown-body a:hover {
  border-bottom-color: var(--text-highlight);
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.5em;
  margin-top: 0;
  margin-bottom: 1em;
  list-style-position: outside;
}

.markdown-body ul {
  list-style-type: none;
}

.markdown-body ul li::before {
  content: "//";
  color: var(--text-dim);
  margin-right: 0.5em;
  font-family: "JetBrains Mono", monospace;
}

.markdown-body ol {
  list-style-type: decimal;
}

.markdown-body li {
  margin-top: 0.3em;
}

.markdown-body code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.875em;
  padding: 0.2em 0.4em;
  margin: 0;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 2px;
}

.markdown-body pre {
  padding: 1em;
  margin-top: 0;
  margin-bottom: 1em;
  overflow: auto;
  font-size: 85%;
  line-height: 1.5;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 2px;
}

.markdown-body pre code {
  font-size: 100%;
  padding: 0;
  background-color: transparent;
  border-radius: 0;
}

.markdown-body blockquote {
  margin: 0;
  padding: 0.5em 1em;
  color: var(--text-dim);
  border-left: 2px solid var(--border);
  background: var(--bg-secondary);
}

.markdown-body hr {
  height: 1px;
  padding: 0;
  margin: 2em 0;
  background-color: var(--border);
  border: 0;
}

.markdown-body table {
  border-spacing: 0;
  border-collapse: collapse;
  margin-top: 0;
  margin-bottom: 1em;
  width: 100%;
}

.markdown-body table th,
.markdown-body table td {
  padding: 8px 12px;
  border: 1px solid var(--border);
}

.markdown-body table th {
  font-weight: 600;
  background-color: var(--bg-secondary);
  color: var(--text-highlight);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.85em;
}

.markdown-body table tr:nth-child(2n) {
  background-color: rgba(26, 26, 26, 0.3);
}

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: 2px;
  border: 1px solid var(--border);
}

.markdown-body .math-inline {
  white-space: normal;
}

.markdown-body .math-display {
  margin: 1.5rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.loading {
  color: var(--text-dim);
  text-align: center;
  padding: 2rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.pagination-row {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.page-btn {
  border: 1px solid var(--border);
  border-radius: 2px;
  background: transparent;
  color: var(--text-dim);
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all 0.25s ease;
}

.page-btn:hover:not(:disabled) {
  border-color: var(--text-dim);
  color: var(--text-highlight);
}

.page-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.page-indicator {
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.back-btn-link {
  text-decoration: none;
}

@media (max-width: 768px) {
  .home-shell {
    padding-top: 2rem;
  }

  .home-header {
    padding: 2.5rem 1rem 2rem;
  }

  .hero-meta {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }

  .post-grid {
    grid-template-columns: 1fr;
  }
}