/* === Reset & Base === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a0a;
  --bg-elevated: #111;
  --text: #e0e0e0;
  --text-secondary: #aaa;
  --accent: #e8a849;
  --accent-hover: #f0bc6a;
  --border: #222;
  --max-width: 720px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

/* === Topo Background === */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: url('../images/topo-bg.svg') center/cover no-repeat;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* === Header === */
header {
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, transparent, var(--accent), transparent) 1;
  padding: 1.25rem 0;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(8px);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.site-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 15%;
  transform: scale(1.3);
  border: 2px solid var(--border);
  transition: border-color 0.3s;
  overflow: hidden;
}

.site-avatar:hover {
  border-color: var(--accent);
}

.site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

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

.site-subtitle {
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 300;
  margin-top: 0.1rem;
}

/* === Main === */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
}

/* === Home Layout === */
.home-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 4rem;
  align-items: start;
}

/* === Post List === */
.list-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  text-transform: capitalize;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.post-card {
  padding: 1.25rem 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.2s, background 0.2s;
}

.post-card:hover {
  border-color: #333;
  background: var(--bg-elevated);
}

.post-card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}

.post-card a {
  color: var(--text);
}

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

.post-card time {
  display: block;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.summary {
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-size: 0.95rem;
}

/* === Tags === */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  transition: background 0.2s, color 0.2s;
}

.tag:hover {
  background: var(--accent);
  color: var(--bg);
}

/* === Single Post === */
.post {
  max-width: var(--max-width);
}

.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
}

.post-header time {
  display: block;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* === Post Content === */
.post-content {
  font-size: 1rem;
  line-height: 1.8;
}

.post-content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.post-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.post-content p {
  margin-bottom: 1rem;
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 1.5rem 0;
}

.post-content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.5;
}

.post-content code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
}

.post-content :not(pre) > code {
  background: var(--bg-elevated);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--text-secondary);
  font-style: italic;
}

.post-content ul, .post-content ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.post-content li {
  margin-bottom: 0.35rem;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.post-content th, .post-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.post-content th {
  background: var(--bg-elevated);
  font-weight: 600;
}

/* Embedded maps / iframes */
.post-content iframe {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin: 1.5rem 0;
}

/* === Sidebar === */
.sidebar {
  position: sticky;
  top: 2rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}

.sidebar-section {
  margin-bottom: 2rem;
}

.sidebar-heading {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.search-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: rgba(17, 17, 17, 0.7);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
}

.search-input::placeholder {
  color: #555;
}

.search-input:focus {
  border-color: var(--accent);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.sidebar-tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  transition: border-color 0.2s, color 0.2s;
}

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

.tag-count {
  color: #555;
  font-size: 0.65rem;
}

/* === Project Tree === */
.project-tree {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.project-link {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: block;
  padding: 0.2rem 0;
  transition: color 0.2s;
}

.project-link:hover {
  color: var(--accent);
}

.project-link.active {
  color: var(--accent);
  font-weight: 500;
}

.sidebar-heading--spaced {
  margin-top: 1.25rem;
}

/* === Footer === */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(8px);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.85rem;
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--accent);
}

/* === Responsive === */
@media (max-width: 768px) {
  .home-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .sidebar {
    order: -1;
    position: static;
  }
}

@media (max-width: 600px) {
  .post-header h1 {
    font-size: 1.35rem;
  }

  main {
    padding: 1.5rem 1rem 3rem;
  }

  .site-avatar {
    width: 36px;
    height: 36px;
  }
}