/* post.css — styles for a single post page */
:root {
  --font-sans: 'Montserrat', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', Georgia, serif;

  --bg: #fcfcfc;
  --ink: #202020;
  --ink-2: #000000;
  --ink-muted: #6b6b6b;
  --panel: #f5f5f5;
  --edge: #e8e8e8;
  --shadow-color-rgb: 0, 0, 0;

  --radius: 16px;
  --maxw-prose: 800px;
  --maxw-page: 1280px;
  --timing: cubic-bezier(.2, .8, .2, 1);
  --duration: .3s;
}
html[data-theme="dark"] {
  --bg: #0E1012;
  --ink: #e2e2e2;
  --ink-2: #ffffff;
  --ink-muted: #8c8c8c;
  --panel: #16181A;
  --edge: #2a2c2e;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--duration) ease, color var(--duration) ease;
}

/* page grid */
.page-wrapper {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0,1fr) minmax(0, var(--maxw-prose)) minmax(0,1fr);
}


header, main { grid-column: 2 / 3; }

/* progress bar */
body::before {
  content: "";
  position: fixed; left: 0; top: 0; height: 3px;
  width: calc(var(--scroll, 0) * 100%);
  background-color: var(--ink-2);
  z-index: 1000;
  transition: background-color var(--duration) ease;
}

/* topbar + logo */
.topbar, header, main {
  max-width: var(--maxw-page);
  margin-left: auto; margin-right: auto;
  padding: 0 24px;
  position: relative; z-index: 2;
}
.topbar { padding-top: 40px; padding-bottom: 24px; display: grid; place-items: center; }
.brand { position: relative; display: inline-block; text-decoration: none; }
.brand img { width: 64px; height: 64px; border-radius: 18px; display: block; border: 1.5px solid var(--edge); transition: border-color var(--duration) ease; }
.brand::after { content:''; position:absolute; inset:-8px; border-radius:24px; z-index:-1; opacity:0; animation:pulse-glow 5s ease-in-out infinite; transition:opacity var(--duration) ease; }

/* header & meta */
header { padding: clamp(3rem, 8vw, 6rem) 0 2rem; animation: fadeIn 500ms var(--timing) both; }
header h1 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
  color: var(--ink-2);
}
header .meta {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink-muted);
}

.cover-image { margin-top: 2rem; border-radius: var(--radius); overflow: hidden; box-shadow: 0 15px 40px rgba(var(--shadow-color-rgb), 0.08); }
.cover-image img { width: 100%; height: auto; display: block; }

/* article */
main { padding-bottom: 15vh; }
article { animation: fadeIn 500ms 100ms var(--timing) both; }
article h2, article h3, article h4 {
  font-family: var(--font-sans);
  font-weight: 900;
  color: var(--ink-2);
  margin: 2.5rem 0 1rem;
  line-height: 1.3;
}
article h2 { font-size: 1.8rem; }
article h3 { font-size: 1.4rem; }

article a {
  color: var(--ink-2);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: color var(--duration) ease, text-decoration-color var(--duration) ease;
}
article a:hover { color: var(--ink); }

article img {
  max-width: 100%; display: block; margin: 2rem auto;
  border-radius: 12px; box-shadow: 0 10px 30px rgba(var(--shadow-color-rgb), 0.07);
  cursor: pointer; transition: transform 0.2s var(--timing);
}
article img:hover { transform: scale(1.02); }

article blockquote {
  margin: 2rem 0; padding: 0 1.5rem;
  border-left: 3px solid var(--ink);
  font-style: italic; font-size: 1.2rem; color: var(--ink-muted);
}
article hr { border: 0; height: 1px; background-color: var(--edge); margin: 3rem auto; width: 50%; }

pre {
  background-color: var(--panel); border: 1px solid var(--edge);
  border-radius: 12px; padding: 1.25rem; overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9rem; line-height: 1.6; position: relative;
}
code { background-color: var(--panel); padding: 0.1rem 0.4rem; border-radius: 6px; font-size: 0.85em; }
.copy-btn {
  position: absolute; top: 0.75rem; right: 0.75rem;
  font-size: .8rem; font-weight: 700; font-family: var(--font-sans);
  padding: .4rem .6rem; border-radius: 8px; border: 1px solid var(--edge);
  background-color: var(--bg); color: var(--ink-muted); cursor: pointer; transition: all .2s ease;
}
.copy-btn:hover { background-color: var(--edge); color: var(--ink); }

.tag-list { margin-top: 3rem; display: flex; gap: .5rem; flex-wrap: wrap; }
.tag-list span {
  font-family: var(--font-sans);
  padding: .2rem .8rem; border-radius: 99px; font-size: .8rem; font-weight: 700;
  border: 1px solid var(--edge); background-color: var(--bg);
}

/* --- Post CTA (premium, minimal) --- */
.post-cta {
  margin-top: 3rem;
  border-radius: 16px;
  padding: 1.25rem 1.25rem 1.35rem;
  background:
    linear-gradient(var(--bg), var(--bg)) padding-box,
    linear-gradient(135deg, rgba(17,24,39,.12), rgba(124,58,237,.22)) border-box;
  border: 1px solid transparent;
  box-shadow: 0 10px 30px rgba(var(--shadow-color-rgb), .06);
  transition: transform .2s var(--timing), box-shadow .2s var(--timing);
}
/* .post-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(var(--shadow-color-rgb), .10);
} */

.post-cta h3 {
  margin: 0 0 .4rem 0;
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -.01em;
  font-size: 1.22rem;
  color: var(--ink-2);
}

.post-cta p {
  margin: 0 0 1rem 0;
  color: var(--ink-muted);
  font-size: .98rem;
}

/* CTA actions */
.post-cta .cta-actions {
  display: flex;
  gap: .65rem;
  flex-wrap: wrap;
}

/* Buttons (refined) */
.btn {
  display: inline-block;
  padding: .62rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--edge);
  background: transparent;
  color: var(--ink-2);
  text-decoration: none;
  font-weight: 700;
  font-family: var(--font-sans);
  font-size: .94rem;
  letter-spacing: .01em;
  box-shadow: none;
}
/* .btn:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
  box-shadow: 0 9px 22px rgba(var(--shadow-color-rgb), .16);
} */

/* Ghost button (outline) */
.btn-ghost {
  background: transparent;
  color: var(--ink-2);
  border: 1px solid var(--edge);
  box-shadow: none;
}
/* .btn-ghost:hover {
  background: rgba(17,24,39,.05);
} */

/* Small helper for icon spacing, if needed */
.btn [class^="fa-"], .btn-ghost [class^="fa-"] { margin-right: .4rem; }


@media (max-width: 900px){
  .page-wrapper{ column-gap:0; }     
  .topbar, header, main { padding-inline:16px; }
       /* or: gap:0; */
  /* optional: collapse to a single column instead */
  /* .page-wrapper{ grid-template-columns:1fr; gap:0; } */
  /* header, main { grid-column:1 / -1; } */
}


/* ToC (desktop) */
.toc-container { grid-column: 3 / 4; position: sticky; top: 10vh; height: 80vh; display: none; }
@media (min-width: 1200px) { .toc-container { display: block; } }
.toc-container h3 {
  font-family: var(--font-sans);
  font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--ink-muted); margin: 0 0 1rem;
}
.toc-container nav a {
  display: block; padding: 0.3rem 0; font-family: var(--font-sans); font-size: 0.9rem; font-weight: 700; text-decoration: none;
  color: var(--ink-muted); border-left: 2px solid var(--edge); padding-left: 1rem; transition: all 0.2s ease;
}
.toc-container nav a:hover { color: var(--ink); border-left-color: var(--ink); }
.toc-container nav a.active { color: var(--ink-2); border-left-color: var(--ink-2); transform: translateX(4px); }

/* FAB */
.fab-container { position: fixed; bottom: max(24px, env(safe-area-inset-bottom)); right: max(24px, env(safe-area-inset-right)); z-index: 999; }
.fab-actions {
  display: flex; flex-direction: column; align-items: center; gap: 12px; margin-bottom: 16px;
  transform-origin: bottom center; transform: translateY(10px) scale(0.9); opacity: 0; visibility: hidden;
  transition: transform 0.2s var(--timing), opacity 0.2s ease, visibility 0s 0.2s;
}
.fab-container.open .fab-actions { transform: translateY(0) scale(1); opacity: 1; visibility: visible; transition: transform 0.2s var(--timing), opacity 0.2s ease, visibility 0s 0s; }
.fab-btn, .fab-toggle {
  width: 56px; height: 56px; border-radius: 50%; background-color: var(--bg); border: 1px solid var(--edge);
  color: var(--ink); display: grid; place-items: center; cursor: pointer; box-shadow: 0 5px 15px rgba(var(--shadow-color-rgb), 0.1);
  font-size: 1.25rem; transition: all 0.2s var(--timing);
}
.fab-btn:hover, .fab-toggle:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(var(--shadow-color-rgb), 0.15); border-color: var(--ink-muted); }
.fab-toggle { font-size: 1.75rem; }

/* Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 1001; background-color: rgba(0,0,0,0.8); backdrop-filter: blur(8px);
  display: grid; place-items: center; padding: 2rem; cursor: pointer; opacity: 0; visibility: hidden;
  transition: opacity .3s ease, visibility 0s .3s;
}
.lightbox.show { opacity: 1; visibility: visible; transition-delay: 0s; }
.lightbox img { max-width: 100%; max-height: 100%; border-radius: 12px; box-shadow: 0 20px 50px rgba(0,0,0,0.5); }

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse-glow { 0%,100%{opacity:.2;transform:scale(1)} 50%{opacity:.5;transform:scale(1.05)} }