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

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #151d2e;
  --bg-card-hover: #1a2540;
  --border-color: #1e293b;
  --border-glow: #0ea5e9;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --gradient-main: linear-gradient(135deg, #06b6d4, #3b82f6, #8b5cf6);
  --gradient-text: linear-gradient(90deg, #06b6d4, #8b5cf6);
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 860px;
  --radius: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle grid background */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
a { color: var(--accent-cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-blue); }

/* === HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary) !important;
  letter-spacing: -0.5px;
}

.logo-bracket { color: var(--accent-cyan); }
.logo-dot { color: var(--accent-purple); }

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

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary) !important;
  font-weight: 400;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: width var(--transition);
  border-radius: 1px;
}

.nav-link:hover, .nav-link.active { color: var(--text-primary) !important; }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.nav-github {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 4px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted) !important;
}

.nav-github:hover { border-color: var(--accent-cyan); color: var(--accent-cyan) !important; }
.nav-github::after { display: none; }

/* === HERO === */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}

.hero-glitch {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
  position: relative;
}

.hero-glitch.glitch-active {
  animation: glitch 0.3s ease;
}

@keyframes glitch {
  0% { transform: translate(0); }
  20% { transform: translate(-2px, 2px); }
  40% { transform: translate(2px, -2px); }
  60% { transform: translate(-1px, -1px); }
  80% { transform: translate(1px, 1px); }
  100% { transform: translate(0); }
}

.hero-sub {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-top: 12px;
  font-weight: 300;
}

.hero-line {
  width: 60px;
  height: 3px;
  background: var(--gradient-main);
  margin: 28px auto 0;
  border-radius: 2px;
}

/* === POST CARDS === */
.posts-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 60px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(12px);
}

.post-card.revealed {
  opacity: 1;
  transform: translateY(0);
}

.post-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.06);
  transform: translateY(-2px);
}

.post-card-link { color: inherit !important; display: block; }
.post-card-link:hover { color: inherit !important; }

.post-card-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.post-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 10px;
}

.post-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 14px;
}

.post-card-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  padding: 2px 8px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: 4px;
}

.tag-sm { font-size: 0.68rem; padding: 1px 6px; }

.post-card-read {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  opacity: 0;
  transition: opacity var(--transition);
}

.post-card:hover .post-card-read { opacity: 1; }

/* === PAGINATION === */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  padding: 40px 0 80px;
}

.page-btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary) !important;
  padding: 8px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.page-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan) !important;
  background: rgba(6, 182, 212, 0.05);
}

.page-info {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* === POST PAGE === */
.post {
  padding: 48px 0 80px;
}

.post-header {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.post-meta time {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-cyan);
}

.category-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 10px;
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: 4px;
}

.post-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.5px;
}

.post-tags { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }

.post-body {
  font-size: 1.02rem;
  line-height: 2;
  color: var(--text-primary);
}

.post-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.post-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.post-body h4 { font-size: 1.05rem; font-weight: 600; margin: 24px 0 8px; }

.post-body p { margin-bottom: 18px; color: var(--text-secondary); }

.post-body strong { color: var(--text-primary); font-weight: 600; }

.post-body a {
  color: var(--accent-cyan);
  border-bottom: 1px solid rgba(6, 182, 212, 0.3);
}

.post-body a:hover { border-bottom-color: var(--accent-cyan); }

.post-body ul, .post-body ol {
  margin: 16px 0;
  padding-left: 24px;
  color: var(--text-secondary);
}

.post-body li { margin-bottom: 6px; }
.post-body li::marker { color: var(--accent-cyan); }

.post-body blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  border-left: 3px solid var(--accent-cyan);
  background: rgba(6, 182, 212, 0.04);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
}

.post-body blockquote p { margin-bottom: 0; color: inherit; }

.post-body pre {
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 20px 0;
  overflow-x: auto;
  position: relative;
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.post-body p > code {
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85rem;
}

.post-body img {
  max-width: 100%;
  border-radius: var(--radius);
  margin: 20px 0;
  border: 1px solid var(--border-color);
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.92rem;
}

.post-body th, .post-body td {
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.post-body th {
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
}

.post-body td { color: var(--text-secondary); }

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 4px;
  padding: 3px 10px;
  cursor: pointer;
  transition: all var(--transition);
}

.copy-btn:hover { background: rgba(6, 182, 212, 0.2); }

.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.back-link {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-muted) !important;
}

.back-link:hover { color: var(--accent-cyan) !important; }

/* === ARCHIVE === */
.page-title {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 48px 0 36px;
}

.title-bracket { color: var(--accent-cyan); }

.archive-list { padding-bottom: 60px; }

.archive-year { margin-bottom: 32px; }

.year-label {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.year-line {
  width: 100%;
  height: 1px;
  background: var(--border-color);
  margin-bottom: 16px;
}

.year-posts { list-style: none; }

.archive-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(30, 41, 59, 0.5);
  transition: background var(--transition);
}

.archive-item:hover { background: rgba(6, 182, 212, 0.03); }

.archive-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  min-width: 55px;
  flex-shrink: 0;
}

.archive-link {
  color: var(--text-primary) !important;
  font-weight: 500;
  flex: 1;
}

.archive-link:hover { color: var(--accent-cyan) !important; }

/* === 404 === */
.error-page {
  text-align: center;
  padding: 100px 0;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 6rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--text-muted);
  letter-spacing: 4px;
  margin-bottom: 12px;
}

.error-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 24px; }

.error-line {
  width: 40px;
  height: 3px;
  background: var(--gradient-main);
  margin: 0 auto 24px;
  border-radius: 2px;
}

.error-home {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent-cyan) !important;
  padding: 8px 24px;
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: var(--radius);
  display: inline-block;
}

.error-home:hover { background: rgba(6, 182, 212, 0.08); }

/* === FOOTER === */
.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  padding: 40px 0 32px;
  gap: 40px;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 8px;
  max-width: 280px;
}

.footer-section h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.footer-section a {
  display: block;
  color: var(--text-secondary) !important;
  font-size: 0.88rem;
  margin-bottom: 8px;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 16px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* === CATEGORY PAGE === */
.category-tag-lg {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 4px 14px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 4px;
  color: var(--accent-cyan);
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .nav { height: 56px; }
  .logo { font-size: 1rem; }
  .nav-links { gap: 16px; }
  .hero { padding: 48px 0 40px; }
  .post-card { padding: 20px; }
  .post { padding: 32px 0 60px; }
  .footer-grid { flex-direction: column; gap: 24px; }
  .archive-item { flex-wrap: wrap; }
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* === SELECTION === */
::selection { background: rgba(6, 182, 212, 0.25); color: var(--text-primary); }