/* ============================================
   TWP Technical Notes — Custom Brand System
   Brand Blue: #0066FF | Accent Orange: #FF6B35
   ============================================ */

/* ----- 1. Font Stack & Typography ----- */

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  color: #1A1A2E;
  line-height: 1.8;
  font-size: 16px;
}
.main {
  font-family: inherit;
}

/* Title hierarchy */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: 2.5rem;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.25rem;
  font-weight: 600;
}
h4 {
  font-size: 1.1rem;
  font-weight: 600;
}

/* Article titles in lists */
.post-entry .entry-header h2,
.entry-hint-parent {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1A1A2E;
  transition: color 0.2s;
}
.post-entry:hover .entry-header h2 {
  color: #0066FF;
}

/* Subtle text */
.post-meta,
.entry-footer,
.page-header .post-description {
  color: #6C757D;
}

/* ----- 2. Brand Colors Overrides ----- */

:root {
  --brand: #0066FF;
  --brand-hover: #0052CC;
  --accent: #FF6B35;
  --bg-light: #F8F9FA;
  --card-bg: #FFFFFF;
  --text-primary: #1A1A2E;
  --text-secondary: #6C757D;
  --code-bg: #F1F5F9;
}

/* Primary buttons/links */
a,
.entry-link {
  color: var(--brand);
}
a:hover {
  color: var(--brand-hover);
}

.post-entry {
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid #eef0f2;
  box-shadow: 0 4px 20px rgba(0, 102, 255, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.post-entry:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 102, 255, 0.12);
}

/* ----- 3. Code Blocks (Developer Face) ----- */

.post-content pre {
  background: #1E1E2E;
  border-radius: 12px;
  padding: 1.5rem;
  overflow-x: auto;
  position: relative;
  margin: 1.5rem 0;
  border: none;
}
.post-content pre code {
  color: #e4e4e7;
  font-size: 0.85rem;
  line-height: 1.6;
  background: transparent;
  padding: 0;
}

/* Language tag on code blocks */
.post-content pre {
  overflow: hidden !important;
}
.post-content pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 0;
  right: 0;
  background: #0066FF;
  color: white;
  padding: 4px 14px;
  border-radius: 0 12px 0 12px;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* Copy button in code blocks */
.copy-code {
  position: absolute;
  top: 10px;
  right: 10px;
  opacity: 0;
  transition: opacity 0.2s;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 0.75rem;
  cursor: pointer;
  z-index: 2;
}
.post-content pre:hover .copy-code {
  opacity: 1;
}

/* Inline code */
code {
  background: #F1F5F9;
  color: #0066FF;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ----- 4. Engineering Visual Elements ----- */

/* HR divider: thin line + dot (like mechanical drawing) */
.post-content hr {
  border: none;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    #d0d5dd 20%,
    #d0d5dd 80%,
    transparent 100%
  );
  margin: 2.5rem 0;
  position: relative;
}
.post-content hr::after {
  content: "●";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  font-size: 8px;
  color: #0066FF;
  background: #fff;
  padding: 2px 6px;
}

/* Blockquote — pit-warning style */
.post-content blockquote {
  border-left: 4px solid #FF6B35;
  background: #FFF8F5;
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 8px 8px 0;
  color: #4a3728;
}
.post-content blockquote p {
  margin: 0.3rem 0;
}
/* Blockquote with ⚠️ prefix — warning specific */
.post-content blockquote:has(strong:first-child) {
  border-left-color: #0066FF;
  background: #F5F9FF;
}

/* Tags as nameplates */
.post-tags a,
.entry-tags a,
.tag-list a,
.terms-tags a {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 14px;
  border: 1px solid #d0d5dd;
  border-radius: 4px;
  background: #fff;
  color: #1A1A2E;
  transition: all 0.2s;
  letter-spacing: 0.3px;
}
.post-tags a:hover,
.entry-tags a:hover,
.tag-list a:hover,
.terms-tags a:hover {
  border-color: #0066FF;
  color: #0066FF;
  background: #F5F9FF;
}

/* Category/Series tags */
.series-list a,
.category-list a {
  font-weight: 500;
}

/* ----- 5. Table of Contents Styling ----- */

.toc {
  border-left: 3px solid #0066FF;
  background: #F8FAFC;
  padding: 1rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
}
.toc details summary {
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

/* ----- 6. Post Meta / Footer Branding ----- */

.post-entry .entry-footer {
  border: none;
  padding-top: 0;
}

/* First entry special */
.first-entry {
  border-radius: 12px;
  border: 1px solid #eef0f2;
  box-shadow: 0 4px 20px rgba(0, 102, 255, 0.06);
}

/* ----- 7. Article Cover in Entries ----- */

.post-entry .entry-cover {
  border-radius: 12px 12px 0 0;
  overflow: hidden;
  margin: 0;
}
.post-entry .entry-cover img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

/* ----- 8. Responsive Adjustments ----- */

@media (max-width: 768px) {
  body { font-size: 15px; }
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.4rem; }
  .post-content pre { padding: 1rem; border-radius: 8px; }
}