@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #ffffff;
  --bg2: #f8fafc;
  --bg3: #f1f5f9;
  --card: #ffffff;
  --card-hover: #fafafa;
  --text: #0f172a;
  --text2: #475569;
  --text3: #64748b;
  --muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --accent: #0ea5e9;
  --accent2: #0284c7;
  --accent-light: #e0f2fe;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
}

.dark {
  --bg: #0f172a;
  --bg2: #1e293b;
  --bg3: #334155;
  --card: #1e293b;
  --card-hover: #334155;
  --text: #f1f5f9;
  --text2: #cbd5e1;
  --text3: #94a3b8;
  --muted: #64748b;
  --border: #334155;
  --border-light: #1e293b;
  --accent: #38bdf8;
  --accent2: #0ea5e9;
  --accent-light: #0c4a6e;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

/* Reset & Base */
* { margin: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent2);
}

/* Navigation */
.nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background: rgba(var(--bg) === '#ffffff' ? '255,255,255,0.95' : '15,23,42,0.95', 1);
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.nav-logo span.sm {
  font-weight: 400;
  font-size: 14px;
  color: var(--text3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex: 1;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--text2);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text);
}

/* Search */
.search-box {
  position: relative;
}

.search-box input {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px 10px 36px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  width: 220px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  font-family: 'Inter', system-ui, sans-serif;
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-box::before {
  content: '🔍';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  opacity: 0.5;
  pointer-events: none;
}

.search-box form { display: inline; }

/* Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 20px;
}

/* Card */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity 0.2s ease;
}

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

.card:hover::before {
  opacity: 1;
}

/* Tags */
.tag {
  background: var(--bg2);
  color: var(--text2);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  display: inline-block;
  transition: all 0.15s ease;
  white-space: nowrap;
}

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

/* Meta */
.meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 13px;
  color: var(--muted);
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.meta .sep {
  opacity: 0.4;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Typography */
h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
}

h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--text);
}

h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--text);
}

p.sub {
  color: var(--text2);
  font-size: 18px;
  line-height: 1.6;
}

.excerpt {
  color: var(--text2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.7;
}

/* Tags Inline */
.tags-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  align-items: center;
}

.tags-inline span {
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
}

.tags-inline a {
  color: var(--accent);
  transition: opacity 0.15s ease;
}

.tags-inline a:hover {
  opacity: 0.8;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.pagination button {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
  font-family: 'Inter', system-ui, sans-serif;
}

.pagination .active {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow);
}

.pagination .other {
  background: var(--bg2);
  color: var(--text2);
  border: 1px solid var(--border);
}

.pagination .other:hover {
  background: var(--bg3);
  border-color: var(--accent);
}

/* Buttons */
.btn {
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-size: 14px;
  transition: all 0.15s ease;
  font-family: 'Inter', system-ui, sans-serif;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg2);
  border-color: var(--accent);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg2);
  color: var(--text2);
  font-weight: 500;
  transition: all 0.15s ease;
  font-family: 'Inter', system-ui, sans-serif;
}

.btn-sm:hover {
  background: var(--bg3);
  border-color: var(--accent);
  color: var(--text);
}

.btn-danger {
  color: #ef4444;
}

.btn-danger:hover {
  background: #fef2f2;
  border-color: #ef4444;
}

/* Prose / Article Content */
.prose {
  margin-top: 40px;
}

.prose p {
  margin-bottom: 20px;
  color: var(--text2);
  line-height: 1.8;
  font-size: 17px;
}

.prose h1 {
  font-size: 2.25em;
  margin: 48px 0 16px;
  color: var(--text);
  letter-spacing: -0.02em;
}

.prose h2 {
  font-size: 1.75em;
  margin: 40px 0 16px;
  color: var(--text);
  letter-spacing: -0.01em;
}

.prose h3 {
  font-size: 1.35em;
  margin: 32px 0 12px;
  color: var(--text);
  letter-spacing: -0.01em;
}

.prose code {
  background: var(--bg2);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.9em;
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-weight: 500;
}

.prose pre {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
  position: relative;
}

.prose pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

.prose strong {
  color: var(--text);
  font-weight: 600;
}

.prose ul, .prose ol {
  margin: 20px 0;
  padding-left: 28px;
  color: var(--text2);
  line-height: 1.8;
}

.prose li {
  margin-bottom: 8px;
}

.prose blockquote {
  border-left: 4px solid var(--accent);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--text3);
  font-style: italic;
  font-size: 1.05em;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95em;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.prose th, .prose td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  color: var(--text2);
}

.prose th {
  font-weight: 600;
  color: var(--text1);
  background: var(--card);
  white-space: nowrap;
}

.prose tr:hover {
  background: rgba(74, 222, 128, 0.04);
}

.prose em {
  color: var(--text2);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

.prose a {
  text-decoration: underline;
  text-decoration-color: var(--accent-light);
  text-underline-offset: 2px;
}

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

/* Comments */
.comments-section {
  margin-top: 72px;
  border-top: 1px solid var(--border);
  padding-top: 40px;
}

.comment {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.comment-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  flex-shrink: 0;
}

.comment-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
}

.comment-date {
  font-size: 13px;
  color: var(--muted);
}

.comment-text {
  font-size: 15px;
  color: var(--text2);
  line-height: 1.6;
}

.comment-form input,
.comment-form textarea,
.comment-form select {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  width: 100%;
  outline: none;
  font-size: 14px;
  font-family: 'Inter', system-ui, sans-serif;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.comment-form input:focus,
.comment-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.comment-form .row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.comment-form textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg2);
  padding: 64px 20px;
  margin-top: 96px;
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 28px;
  font-size: 14px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 28px;
  align-items: center;
}

.footer-links a {
  color: var(--muted);
  transition: color 0.15s ease;
}

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

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  z-index: 100;
  cursor: pointer;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

/* Reading Time */
.reading-time {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--muted);
}

.reading-time::before {
  content: '📖';
}

/* Admin */
.admin-nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
}

.admin-nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.admin-nav-links button {
  background: none;
  border: none;
  color: var(--text2);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 0;
  transition: color 0.15s ease;
  font-family: 'Inter', system-ui, sans-serif;
}

.admin-nav-links button:hover {
  color: var(--text);
}

.admin-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 20px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
}

.stat-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.stat-label {
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.post-row {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  transition: all 0.15s ease;
}

.post-row:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.post-row-info {
  flex: 1;
  min-width: 0;
}

.post-row-title {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
  font-size: 15px;
}

.post-row-meta {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
}

.post-row-actions {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
  margin-left: 16px;
}

.badge {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
  text-transform: capitalize;
}

.badge-green {
  background: #dcfce7;
  color: #15803d;
}

.dark .badge-green {
  background: #14532d;
  color: #86efac;
}

.badge-gray {
  background: #f1f5f9;
  color: #64748b;
}

.dark .badge-gray {
  background: #475569;
  color: #cbd5e1;
}

.badge-yellow {
  background: #fef9c3;
  color: #a16207;
}

.dark .badge-yellow {
  background: #713f12;
  color: #fde047;
}

.badge-purple {
  background: #f3e8ff;
  color: #7c3aed;
}

.dark .badge-purple {
  background: #581c87;
  color: #d8b4fe;
}

.empty-state {
  text-align: center;
  padding: 96px 0;
  color: var(--muted);
  font-size: 18px;
}

.empty-state p {
  font-size: 64px;
  margin-bottom: 16px;
}

/* Highlight.js Dark Theme */
.hljs {
  background: var(--bg2) !important;
  color: var(--text) !important;
  border-radius: var(--radius);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    gap: 16px;
  }
  
  .nav-inner {
    padding: 14px 16px;
  }
  
  .container {
    padding: 36px 16px;
  }
  
  h1 {
    font-size: 28px;
  }
  
  h2 {
    font-size: 20px;
  }
  
  .card {
    padding: 20px;
  }
  
  .comment-form .row {
    grid-template-columns: 1fr;
  }
  
  .post-row-actions {
    flex-wrap: wrap;
  }
  
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }
  
  .search-box input {
    width: 160px;
  }
}

@media (max-width: 640px) {
  .nav-links a:not(:first-child) {
    display: none;
  }
  
  .nav-links::after {
    content: '☰';
    font-size: 20px;
    cursor: pointer;
  }
  
  .theme-toggle {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 18px;
  }
}

/* Print styles */
@media print {
  .nav,
  .footer,
  .theme-toggle,
  .comments-section,
  .pagination {
    display: none !important;
  }
  
  .card {
    box-shadow: none !important;
    border: none !important;
  }
}