/* ============ CSS Variables ============ */
:root {
  --bg: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #16162a;
  --bg-elevated: #1a1a2e;
  --text: #e4e4ed;
  --text-secondary: #8b8ba3;
  --text-muted: #5a5a72;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --accent-bg: rgba(124,58,237,.1);
  --cyan: #06b6d4;
  --pink: #ec4899;
  --green: #10b981;
  --amber: #f59e0b;
  --border: rgba(255,255,255,.06);
  --border-light: rgba(255,255,255,.03);
  --gradient-start: #7c3aed;
  --gradient-mid: #6366f1;
  --gradient-end: #06b6d4;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow-glow: 0 0 30px rgba(124,58,237,.15);
  --shadow-card: 0 4px 24px rgba(0,0,0,.3), 0 0 1px rgba(255,255,255,.05);
  --shadow-hover: 0 8px 40px rgba(124,58,237,.2), 0 0 1px rgba(167,139,250,.3);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --transition-fast: .15s cubic-bezier(.4,0,.2,1);
  --transition-spring: .5s cubic-bezier(.34,1.56,.64,1);
}

/* ============ Reset ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans); color: var(--text); background: var(--bg);
  line-height: 1.7; min-height: 100vh; display: flex; flex-direction: column;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: all var(--transition); }
img { max-width: 100%; display: block; }
::selection { background: var(--accent); color: #fff; }

/* ============ Reading Progress Bar ============ */
.reading-progress {
  position: fixed; top: 0; left: 0; height: 2px; z-index: 9999;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  width: 0%; transition: width .1s linear;
  box-shadow: 0 0 8px var(--accent);
}

/* ============ Layout ============ */
.container { max-width: 780px; margin: 0 auto; padding: 0 1.5rem; width: 100%; }
.main { flex: 1; padding-top: 2.5rem; padding-bottom: 4rem; }

/* ============ Header ============ */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,15,.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: .65rem; font-weight: 700; font-size: 1.1rem; color: var(--text); }
.logo:hover { color: var(--accent-light); }
.logo:hover .logo-icon { box-shadow: 0 0 20px rgba(124,58,237,.4); transform: scale(1.05); }
.logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: var(--radius-xs);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff; font-size: .75rem; font-family: var(--font-mono); font-weight: 700;
  transition: all var(--transition);
}
.logo-text { letter-spacing: -.01em; }
.header-nav { display: flex; gap: .25rem; }
.nav-link {
  padding: .4rem .9rem; border-radius: var(--radius-xs); font-size: .88rem;
  color: var(--text-muted); font-weight: 500; transition: all var(--transition);
}
.nav-link:hover, .nav-link.active { background: var(--accent-bg); color: var(--accent-light); }

/* ============ Hero ============ */
.hero {
  position: relative; overflow: hidden; padding: 6rem 0 5.5rem;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(124,58,237,.15), transparent),
              var(--bg);
}
.hero .container { position: relative; z-index: 2; }
.hero-title {
  font-size: 3.2rem; font-weight: 900; letter-spacing: -.04em;
  background: linear-gradient(135deg, #fff 0%, var(--accent-light) 40%, var(--cyan) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1.15; margin-bottom: 1rem;
}
.hero-desc { font-size: 1.1rem; color: var(--text-muted); max-width: 520px; line-height: 1.8; }
.hero-desc strong { color: var(--accent-light); font-weight: 600; }
.hero-canvas {
  position: absolute; inset: 0; z-index: 1;
}
/* Grid overlay */
.hero::before {
  content: ''; position: absolute; inset: 0; z-index: 1;
  background-image:
    linear-gradient(rgba(255,255,255,.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.015) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 80%);
}
/* Glow orbs */
.hero::after {
  content: ''; position: absolute; z-index: 0;
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(124,58,237,.12), transparent 70%);
  top: -200px; right: -100px;
  animation: orbFloat 8s ease-in-out infinite alternate;
}
.hero-orb-2 {
  position: absolute; z-index: 0;
  width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,.08), transparent 70%);
  bottom: -150px; left: -80px;
  animation: orbFloat 10s ease-in-out infinite alternate-reverse;
}
@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(30px, -20px) scale(1.1); }
}

/* ============ Post List ============ */
.post-list { display: flex; flex-direction: column; gap: 1.25rem; }
.post-card {
  position: relative; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all var(--transition);
  animation: fadeUp .6s ease both;
}
.post-card::before {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius);
  background: radial-gradient(800px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(124,58,237,.06), transparent 40%);
  pointer-events: none; opacity: 0; transition: opacity var(--transition);
}
.post-card:hover::before { opacity: 1; }
.post-card:hover { border-color: rgba(124,58,237,.2); box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.post-card-body { padding: 1.75rem 2rem; position: relative; }
.post-card-date {
  font-size: .78rem; color: var(--text-muted); font-family: var(--font-mono);
  letter-spacing: .03em; display: flex; align-items: center; gap: .5rem;
}
.post-card-date::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); display: inline-block;
  box-shadow: 0 0 8px var(--accent);
}
.post-card-title { font-size: 1.25rem; font-weight: 700; line-height: 1.4; margin: .6rem 0; letter-spacing: -.01em; }
.post-card-title a { color: var(--text); background: linear-gradient(transparent 92%, var(--accent-light) 92%); background-size: 0% 100%; background-repeat: no-repeat; transition: background-size .4s ease; }
.post-card-title a:hover { background-size: 100% 100%; color: #fff; }
.post-card-excerpt { font-size: .9rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: .85rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.read-more {
  font-size: .84rem; font-weight: 600; color: var(--accent-light);
  display: inline-flex; align-items: center; gap: .35rem;
  position: relative; padding: .2rem 0;
}
.read-more::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 1px; background: var(--accent-light);
  transition: width var(--transition);
}
.read-more:hover::after { width: 100%; }
.read-more .arrow { transition: transform var(--transition); display: inline-block; }
.read-more:hover .arrow { transform: translateX(4px); }
.empty { text-align: center; color: var(--text-muted); padding: 5rem 0; font-size: 1rem; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ Pagination ============ */
.pagination {
  display: flex; justify-content: center; align-items: center; gap: 1rem;
  margin-top: 3rem; padding-top: 2rem;
}
.page-btn {
  display: inline-flex; align-items: center; padding: .6rem 1.3rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: .88rem; font-weight: 500; color: var(--text-secondary);
  background: var(--bg-card); transition: all var(--transition);
}
.page-btn:hover:not(.disabled) { border-color: var(--accent); color: var(--accent-light); box-shadow: var(--shadow-glow); }
.page-btn.disabled { opacity: .25; cursor: not-allowed; }
.page-info { font-size: .82rem; color: var(--text-muted); font-family: var(--font-mono); }

/* ============ Post Detail ============ */
.post-header { margin-bottom: 2.5rem; }
.post-meta-top { display: flex; align-items: center; flex-wrap: wrap; gap: .6rem; margin-bottom: .75rem; }
.post-meta-top time { font-size: .82rem; color: var(--text-muted); font-family: var(--font-mono); }
.tag {
  display: inline-block; padding: .2rem .7rem; border-radius: 20px;
  font-size: .73rem; font-weight: 600; letter-spacing: .02em; text-transform: uppercase;
}
.tag-cat { background: var(--accent-bg); color: var(--accent-light); border: 1px solid rgba(124,58,237,.2); }
.tag-label { background: rgba(6,182,212,.08); color: var(--cyan); border: 1px solid rgba(6,182,212,.15); }
.post-title {
  font-size: 2.1rem; font-weight: 800; line-height: 1.3; letter-spacing: -.025em;
  color: var(--text);
}
.post-tags { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .75rem; }

/* ============ Article Content ============ */
.post-content { font-size: 1.02rem; line-height: 1.85; color: var(--text); word-break: break-word; }
.post-content h1, .post-content h2, .post-content h3,
.post-content h4, .post-content h5, .post-content h6 {
  margin: 2.2em 0 .8em; font-weight: 700; line-height: 1.35;
  color: #fff; letter-spacing: -.015em;
}
.post-content h2 {
  font-size: 1.5rem; padding-bottom: .6rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.post-content h2::after {
  content: ''; position: absolute; bottom: -1px; left: 0;
  width: 60px; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
}
.post-content h3 { font-size: 1.25rem; }
.post-content p { margin-bottom: 1.3em; }

/* Images with interaction */
.post-content img {
  border-radius: var(--radius); margin: 2em auto;
  box-shadow: 0 8px 30px rgba(0,0,0,.4);
  border: 1px solid var(--border);
  transition: all .4s cubic-bezier(.4,0,.2,1);
  cursor: zoom-in;
}
.post-content img:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 50px rgba(124,58,237,.2), 0 0 0 1px rgba(124,58,237,.3);
  border-color: rgba(124,58,237,.3);
}

/* Image lightbox */
.lightbox-overlay {
  position: fixed; inset: 0; z-index: 10000;
  background: rgba(0,0,0,.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden;
  transition: all .35s ease;
  cursor: zoom-out;
}
.lightbox-overlay.active { opacity: 1; visibility: visible; }
.lightbox-overlay img {
  max-width: 92vw; max-height: 90vh; border-radius: var(--radius);
  box-shadow: 0 20px 80px rgba(0,0,0,.6);
  transform: scale(.9); transition: transform .4s cubic-bezier(.34,1.56,.64,1);
}
.lightbox-overlay.active img { transform: scale(1); }

/* Code blocks — terminal style */
.post-content pre {
  position: relative;
  background: #0d1117; color: #c9d1d9;
  padding: 0; margin: 1.8em 0;
  border-radius: var(--radius); border: 1px solid rgba(255,255,255,.06);
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0,0,0,.4);
}
.post-content pre::before {
  content: '';
  display: block; padding: .65rem 1rem;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid rgba(255,255,255,.05);
  background-image: radial-gradient(circle 5px at 20px 50%, #ff5f57 5px, transparent 5px),
                     radial-gradient(circle 5px at 40px 50%, #febc2e 5px, transparent 5px),
                     radial-gradient(circle 5px at 60px 50%, #28c840 5px, transparent 5px);
  background-size: 70px 10px;
  background-repeat: no-repeat;
  background-position: 0 50%;
  height: 36px;
}
.post-content pre code {
  display: block; padding: 1rem 1.4rem 1.2rem;
  overflow-x: auto; font-size: .87rem; line-height: 1.75;
  font-family: var(--font-mono);
  background: none; color: inherit; border-radius: 0;
}
.post-content code { font-family: var(--font-mono); font-size: .87em; }
.post-content p code, .post-content li code, .post-content td code {
  background: rgba(124,58,237,.12); color: var(--accent-light);
  padding: .15em .5em; border-radius: 5px; font-size: .84em;
  border: 1px solid rgba(124,58,237,.15);
}

/* Syntax highlighting tokens */
.post-content pre .keyword, .post-content pre .tag { color: #ff7b72; }
.post-content pre .string, .post-content pre .attr-value { color: #a5d6ff; }
.post-content pre .comment { color: #484f58; font-style: italic; }
.post-content pre .function, .post-content pre .class-name { color: #d2a8ff; }
.post-content pre .number, .post-content pre .boolean { color: #79c0ff; }
.post-content pre .operator, .post-content pre .punctuation { color: #c9d1d9; }
.post-content pre .property { color: #7ee787; }
.post-content pre .attr-name { color: #ffa657; }

/* Blockquote */
.post-content blockquote {
  position: relative; border: none; padding: 1rem 1.5rem 1rem 1.75rem; margin: 1.8em 0;
  color: var(--text-secondary);
  background: linear-gradient(135deg, rgba(124,58,237,.06), rgba(6,182,212,.04));
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}
.post-content blockquote p:last-child { margin-bottom: 0; }

.post-content ul, .post-content ol { padding-left: 1.5em; margin-bottom: 1.3em; }
.post-content li { margin-bottom: .35em; }
.post-content li::marker { color: var(--accent-light); }

.post-content a {
  color: var(--accent-light);
  text-decoration: none;
  background: linear-gradient(var(--accent-light), var(--accent-light)) no-repeat left bottom;
  background-size: 100% 1px;
  transition: background-size var(--transition), color var(--transition);
}
.post-content a:hover { background-size: 100% 100%; color: #fff; border-radius: 2px; }

.post-content table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-size: .92rem; }
.post-content th, .post-content td { border: 1px solid var(--border); padding: .65rem .9rem; text-align: left; }
.post-content th { background: var(--bg-elevated); font-weight: 600; color: #fff; }
.post-content td { background: var(--bg-card); }
.post-content hr { border: none; border-top: 1px solid var(--border); margin: 2.5em 0; }

/* ============ Post Nav ============ */
.post-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--border);
}
.nav-card {
  display: flex; flex-direction: column; gap: .35rem;
  padding: 1.15rem 1.4rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); transition: all var(--transition);
  position: relative; overflow: hidden;
}
.nav-card::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(124,58,237,.04), transparent);
  opacity: 0; transition: opacity var(--transition);
}
.nav-card:hover::after { opacity: 1; }
.nav-card:hover { border-color: rgba(124,58,237,.25); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
.nav-label { font-size: .76rem; color: var(--text-muted); font-weight: 500; position: relative; z-index: 1; }
.nav-title {
  font-size: .9rem; font-weight: 600; color: var(--text); line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  position: relative; z-index: 1;
}
.nav-next { text-align: right; }
.nav-empty { border-color: transparent; background: transparent; }
.nav-empty::after { display: none; }

/* ============ Error Page ============ */
.error-page { text-align: center; padding: 6rem 0; }
.error-code {
  font-size: 10rem; font-weight: 900; letter-spacing: -.05em; line-height: 1;
  background: linear-gradient(180deg, rgba(255,255,255,.08), transparent);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.error-glitch {
  font-size: 3.5rem; font-weight: 900; letter-spacing: -.03em;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-top: -2rem; margin-bottom: 1rem;
  position: relative; animation: glitchShake 3s infinite;
}
@keyframes glitchShake {
  0%, 93%, 100% { transform: translateX(0); }
  94% { transform: translateX(-3px); }
  95% { transform: translateX(3px); }
  96% { transform: translateX(-2px); }
  97% { transform: translateX(2px); }
}
.error-msg { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 2.5rem; }
.error-btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .75rem 1.75rem; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff; font-weight: 600; font-size: .9rem; transition: all var(--transition);
  position: relative; overflow: hidden;
}
.error-btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,.15) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform .6s;
}
.error-btn:hover::before { transform: translateX(100%); }
.error-btn:hover { box-shadow: 0 4px 24px rgba(124,58,237,.4); transform: translateY(-2px); }

/* ============ Footer ============ */
.footer {
  border-top: 1px solid var(--border); padding: 2.5rem 0; margin-top: auto;
  background: linear-gradient(180deg, transparent, rgba(124,58,237,.02));
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-copy { font-size: .8rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: .8rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--accent-light); }

/* ============ Responsive ============ */
@media (max-width: 640px) {
  .hero { padding: 4rem 0 3.5rem; }
  .hero-title { font-size: 2.2rem; }
  .hero-desc { font-size: .95rem; }
  .post-title { font-size: 1.5rem; }
  .post-card-body { padding: 1.25rem 1.35rem; }
  .post-nav { grid-template-columns: 1fr; }
  .nav-next { text-align: left; }
  .error-code { font-size: 6rem; }
  .error-glitch { font-size: 2.5rem; }
  .footer-inner { flex-direction: column; text-align: center; }
  .post-content pre code { font-size: .82rem; }
}

/* ============ Scrollbar ============ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(124,58,237,.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(124,58,237,.5); }

/* ============ Highlight.js Override (github-dark-dimmed) ============ */
.hljs { background: transparent !important; padding: 0 !important; }