/* =============================================
   BLOG POST SHARED STYLES
   blog-post.css
   ============================================= */

/* Import Inter font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bp-font: 'Inter', system-ui, -apple-system, sans-serif;
  --bp-text: #1a1d23;
  --bp-text-muted: #6c757d;
  --bp-bg: #f4f6f9;
  --bp-surface: #ffffff;
  --bp-border: #e2e6ea;
  --bp-accent: #4f6ef7;
  --bp-code-bg: #1e2132;
  --bp-code-text: #e8eaf0;
  --bp-inline-code-bg: #f0f2f5;
  --bp-inline-code-text: #c7254e;
}

[data-theme="dark"] {
  --bp-text: #e8eaf0;
  --bp-text-muted: #9aa0b0;
  --bp-bg: #0f1117;
  --bp-surface: #1a1d23;
  --bp-border: #2d3748;
  --bp-inline-code-bg: #2d3748;
  --bp-inline-code-text: #f48fb1;
}

body {
  font-family: var(--bp-font);
  background-color: var(--bp-bg);
  color: var(--bp-text);
  font-size: 1rem;
  line-height: 1.75;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── Post Container ──────────────────────────── */
.container.mt-4 {
  max-width: 820px;
  background-color: var(--bp-surface);
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  margin-bottom: 2rem;
}

/* ── Post Title ──────────────────────────────── */
h2.fw-bold {
  font-size: 1.75rem;
  line-height: 1.3;
  color: var(--bp-text);
  letter-spacing: -0.02em;
}

/* ── Read Time + Share Bar ───────────────────── */
#post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.75rem 0 1.25rem;
  font-size: 0.83rem;
  color: var(--bp-text-muted);
  border-bottom: 1px solid var(--bp-border);
  padding-bottom: 1rem;
}

#read-time {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.share-buttons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  border: 1.5px solid var(--bp-border);
  background: transparent;
  color: var(--bp-text-muted);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.share-btn:hover {
  background-color: var(--bp-accent);
  border-color: var(--bp-accent);
  color: #ffffff;
  text-decoration: none;
}

.share-btn.copy-btn.copied {
  background-color: #198754;
  border-color: #198754;
  color: #fff;
}

/* ── Table of Contents ───────────────────────── */
#post-toc {
  background-color: var(--bp-inline-code-bg);
  border: 1px solid var(--bp-border);
  border-left: 4px solid var(--bp-accent);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.88rem;
}

#post-toc h6 {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bp-text-muted);
  margin-bottom: 0.75rem;
}

#post-toc ol {
  margin: 0;
  padding-left: 1.25rem;
}

#post-toc li {
  margin-bottom: 0.35rem;
  line-height: 1.4;
}

#post-toc a {
  color: var(--bp-accent);
  text-decoration: none;
}

#post-toc a:hover {
  text-decoration: underline;
}

/* ── Headings ────────────────────────────────── */
h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--bp-text);
  margin-top: 2.5rem !important;
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--bp-accent);
  letter-spacing: -0.01em;
}

h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--bp-text);
  margin-top: 1.5rem !important;
}

/* ── Paragraphs & Lists ──────────────────────── */
p {
  color: var(--bp-text);
  line-height: 1.8;
}

ul, ol {
  color: var(--bp-text);
  line-height: 1.8;
}

/* ── Inline Code ─────────────────────────────── */
code:not(pre code) {
  background-color: var(--bp-inline-code-bg);
  color: var(--bp-inline-code-text);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  border: 1px solid var(--bp-border);
}

/* ── Code Blocks (Prism overrides) ───────────── */
pre[class*="language-"],
pre:not([class]) {
  background: var(--bp-code-bg) !important;
  border-radius: 8px !important;
  padding: 1.25rem 1.5rem !important;
  overflow-x: auto;
  font-size: 0.875rem !important;
  line-height: 1.65 !important;
  margin: 1.25rem 0 !important;
  border: none !important;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  position: relative;
}

pre code {
  background: none !important;
  color: var(--bp-code-text) !important;
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  padding: 0 !important;
  border: none !important;
  font-size: inherit;
}

/* Copy-code button */
.code-copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.7);
  border-radius: 5px;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--bp-font);
}

.code-copy-btn:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

.code-copy-btn.copied {
  background: #198754;
  border-color: #198754;
  color: #fff;
}

/* ── Blockquotes ─────────────────────────────── */
blockquote {
  border-left: 4px solid var(--bp-accent);
  background-color: var(--bp-inline-code-bg);
  padding: 0.75rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1.25rem 0;
  color: var(--bp-text-muted);
  font-style: italic;
}

/* ── Links ───────────────────────────────────── */
a {
  color: var(--bp-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ── Back to Home button ─────────────────────── */
.btn-primary {
  background-color: var(--bp-accent);
  border-color: var(--bp-accent);
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background-color: #3b5bdb;
  border-color: #3b5bdb;
}

/* ── Prev / Next Navigation ──────────────────── */
#post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--bp-border);
  flex-wrap: wrap;
}

.post-nav-btn {
  display: flex;
  flex-direction: column;
  padding: 0.85rem 1.1rem;
  background-color: var(--bp-surface);
  border: 1.5px solid var(--bp-border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--bp-text);
  transition: all 0.2s ease;
  flex: 1;
  min-width: 0;
}

.post-nav-btn:hover {
  border-color: var(--bp-accent);
  box-shadow: 0 4px 12px rgba(79,110,247,0.15);
  text-decoration: none;
  color: var(--bp-text);
}

.post-nav-btn .nav-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bp-accent);
  margin-bottom: 0.3rem;
}

.post-nav-btn .nav-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.4;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.post-nav-btn.next-post {
  text-align: right;
}

/* ── Post Footer ─────────────────────────────── */
footer.bg-light {
  background-color: var(--bp-inline-code-bg) !important;
  border-top: 1px solid var(--bp-border) !important;
}

footer .text-muted {
  color: var(--bp-text-muted) !important;
}

/* ── Divider ─────────────────────────────────── */
hr {
  border-color: var(--bp-border);
  opacity: 1;
}

/* ── Responsive ──────────────────────────────── */
@media (max-width: 767px) {
  .container.mt-4 {
    padding: 1.25rem;
    border-radius: 0;
    margin-top: 0 !important;
    box-shadow: none;
  }

  h2.fw-bold {
    font-size: 1.35rem;
  }

  .share-buttons {
    margin-left: 0;
  }

  #post-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  pre[class*="language-"],
  pre:not([class]) {
    font-size: 0.8rem !important;
    padding: 1rem !important;
  }
}

/* =============================================
   ANIMATIONS — KEYFRAMES
   ============================================= */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes progressGrow {
  from { width: 0%; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.18); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* =============================================
   READING PROGRESS BAR
   ============================================= */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--bp-accent), #a78bfa);
  z-index: 9999;
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* =============================================
   SCROLL-REVEAL — SECTIONS
   ============================================= */
h4 {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

h4.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   TOC — ACTIVE SECTION HIGHLIGHT
   ============================================= */
#post-toc a.toc-active {
  color: var(--bp-accent);
  font-weight: 700;
  padding-left: 0.4rem;
  border-left: 2px solid var(--bp-accent);
  transition: all 0.25s ease;
}

/* =============================================
   CODE COPY BUTTON — PULSE ON SUCCESS
   ============================================= */
.code-copy-btn.copied {
  animation: pulse 0.3s ease;
}

/* =============================================
   SHARE BUTTON — RIPPLE FEEL
   ============================================= */
.share-btn {
  transition: background-color 0.2s ease, color 0.2s ease,
              border-color 0.2s ease, transform 0.15s ease;
}

.share-btn:active {
  transform: scale(0.93);
}

/* =============================================
   BACK TO TOP BUTTON
   ============================================= */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background-color: var(--bp-accent);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 14px rgba(79, 110, 247, 0.4);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}

#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#back-to-top:hover {
  background-color: #3b5bdb;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(79, 110, 247, 0.5);
}

/* =============================================
   POST CONTENT — ENTRANCE ANIMATION
   ============================================= */
.container.mt-4 {
  animation: fadeSlideUp 0.5s ease both;
}

/* Prev/next hover lift */
.post-nav-btn {
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.post-nav-btn:hover {
  transform: translateY(-3px);
}