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

body {
  background: #0d0d0d;
  color: #e0e0e0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  margin-bottom: 2rem;
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: #e0e0e0;
  text-decoration: none;
}

.site-logo {
  color: #2dd4bf;
}

.site-title:hover {
  color: #2dd4bf;
}

main {
  flex: 1;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid #262626;
  padding-bottom: 0;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: #777;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  margin-bottom: -1px;
}

.tab-btn:hover {
  color: #e0e0e0;
}

.tab-btn.active {
  color: #2dd4bf;
  border-bottom-color: #2dd4bf;
}

/* Search & Filters */
.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 8px;
  color: #e0e0e0;
  font-size: 1rem;
  margin-bottom: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: #2dd4bf;
}

.tags-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tag-btn {
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 9999px;
  color: #999;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.tag-btn:hover {
  border-color: #2dd4bf;
  color: #2dd4bf;
}

.tag-btn.active {
  background: #2dd4bf;
  color: #0d0d0d;
  border-color: #2dd4bf;
}

/* Post Cards */
.card {
  background: #1a1a1a;
  border: 1px solid #262626;
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: #2dd4bf;
  box-shadow: 0 0 12px rgba(45, 212, 191, 0.1);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #f0f0f0;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: #777;
  margin-bottom: 0.75rem;
}

.card-meta .tag {
  background: #262626;
  color: #2dd4bf;
  padding: 0.1rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
}

.card-summary {
  color: #aaa;
  font-size: 0.95rem;
}

/* Post View */
.back-link {
  display: inline-block;
  color: #2dd4bf;
  text-decoration: none;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.back-link:hover {
  text-decoration: underline;
}

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

.post-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #f0f0f0;
}

.post-body {
  line-height: 1.8;
}

.post-body h2 {
  font-size: 1.4rem;
  margin: 2rem 0 1rem;
  color: #f0f0f0;
}

.post-body h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.75rem;
  color: #e0e0e0;
}

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

.post-body a {
  color: #2dd4bf;
}

.post-body ul, .post-body ol {
  margin: 0 0 1rem 1.5rem;
}

.post-body li {
  margin-bottom: 0.25rem;
}

.post-body code {
  background: #262626;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.9em;
}

.post-body pre {
  background: #161616;
  border: 1px solid #262626;
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.post-body pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

.post-body strong {
  color: #f0f0f0;
}

/* Footer */
footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #262626;
}

.contact {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.contact a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #777;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.contact a:hover {
  color: #2dd4bf;
}

/* Fade-in */
.fade-in {
  animation: fadeIn 0.2s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}