/* ===== RESET & DESIGN TOKENS ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --bg: #0c0c0c;
  --bg2: #161616;
  --bg3: #1c1c1c;
  --w: #f5f5f0;
  --w2: #8a8a82;
  --w3: #555550;
  --bdr: rgba(255, 255, 255, 0.06);
  --sans: "Inter", "Noto Sans TC", "Helvetica Neue", sans-serif;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--bg);
  color: var(--w);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
.w {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

/* ===== NAV ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.1rem 0;
  transition:
    background 0.4s,
    padding 0.4s,
    border-color 0.4s;
  border-bottom: 1px solid transparent;
}
nav.scrolled {
  background: rgba(12, 12, 12, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 0.65rem 0;
  border-bottom-color: var(--bdr);
}
.nav-in {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--w);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}
.nav-links a {
  color: var(--w3);
  font-size: 0.82rem;
  transition: color 0.3s;
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--w);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 0.85rem 2.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: opacity 0.3s;
  cursor: pointer;
  border: none;
  font-family: var(--sans);
  background: var(--w);
  color: var(--bg);
}
.btn:hover {
  opacity: 0.85;
  color: var(--bg);
}

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--bdr);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--w3);
}
footer a {
  color: var(--w3);
  margin: 0 0.6rem;
  text-decoration: none;
}
footer a:hover {
  color: var(--w);
}

/* ===== BLOG GRID (LIST PAGE) ===== */
.blog-hero {
  padding: 8rem 0 3rem;
  text-align: center;
}
.blog-hero h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.blog-hero p {
  color: var(--w2);
  font-size: 1rem;
}
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--bdr);
  border-top: 1px solid var(--bdr);
  border-bottom: 1px solid var(--bdr);
  margin-bottom: 6rem;
}
.blog-card {
  display: block;
  background: var(--bg);
  padding: 2.5rem;
  text-decoration: none;
  transition: background 0.3s;
}
.blog-card:hover {
  background: var(--bg2);
}
.blog-card h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--w);
}
.blog-card p {
  font-size: 0.85rem;
  color: var(--w2);
  margin-bottom: 0.6rem;
}
.blog-card time {
  font-size: 0.78rem;
  color: var(--w3);
}

/* ===== POST (ARTICLE PAGE) ===== */
.post {
  padding-top: 6rem;
}
.post-header {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--bdr);
  margin-bottom: 3rem;
}
.post-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
}
.post-meta {
  color: var(--w2);
  font-size: 0.82rem;
  margin-bottom: 1rem;
}

/* ===== POST CONTENT (PROSE) ===== */
.post-content {
  padding-bottom: 4rem;
}
.post-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 3rem;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}
.post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
}
.post-content p {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--w);
  margin-bottom: 1.5rem;
}
.post-content ul,
.post-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}
.post-content li {
  font-size: 1.05rem;
  line-height: 2;
  margin-bottom: 0.3rem;
}
.post-content strong {
  font-weight: 600;
  color: var(--w);
}
.post-content a {
  color: var(--w);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--w3);
  transition: text-decoration-color 0.3s;
}
.post-content a:hover {
  text-decoration-color: var(--w);
}
.post-content code {
  background: var(--bg2);
  border: 1px solid var(--bdr);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-family: "SF Mono", "Fira Code", monospace;
}
.post-content pre {
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.88rem;
  line-height: 1.7;
}
.post-content blockquote {
  border-left: 3px solid var(--w3);
  padding-left: 1.2rem;
  margin: 1.5rem 0;
  color: var(--w2);
  font-style: italic;
}
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}
.post-content th,
.post-content td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--bdr);
  font-size: 1rem;
}
.post-content th {
  font-weight: 600;
  color: var(--w);
}
.post-content td {
  color: var(--w2);
}

/* ===== POST CTA ===== */
.post-cta {
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-radius: 12px;
  padding: 3rem 2.5rem;
  text-align: center;
  margin: 3rem 0;
}
.post-cta h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}
.post-cta p {
  color: var(--w2);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

/* ===== POST NAV ===== */
.post-nav {
  padding: 2rem 0 4rem;
}
.post-nav a {
  color: var(--w2);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 0.3s;
}
.post-nav a:hover {
  color: var(--w);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .w {
    padding: 0 1.5rem;
  }
  .blog-hero {
    padding: 6rem 0 2rem;
  }
  .blog-hero h1 {
    font-size: 1.8rem;
  }
  .blog-card {
    padding: 1.8rem 1.5rem;
  }
  .post-header {
    padding: 2.5rem 0 2rem;
  }
  .post-header h1 {
    font-size: 1.5rem;
  }
  .post-content h2 {
    font-size: 1.3rem;
  }
  .post-content h3 {
    font-size: 1.1rem;
  }
  .post-cta {
    padding: 2rem 1.5rem;
  }
  .nav-links {
    display: none;
  }
}