/* ─── Design System: Nur Azhar Technical Blog ─────────────────── */

/* ─── Fonts ────────────────────────────────────────────────────── */
/* Loaded via link tags in HTML head to eliminate render-blocking chains */

/* ─── Reset ────────────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ─── Custom Properties ────────────────────────────────────────── */
:root {
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Monaco', 'Menlo', 'Consolas', monospace;

  --color-bg: #f8f6f3;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-text-tertiary: #9ca3af;
  --color-accent: #bc4123;
  --color-accent-hover: #a3361d;
  --color-accent-subtle: #fdf2ee;
  --color-border: #e5e0d8;
  --color-border-light: #f3f4f6;
  --color-code-bg: #f3f4f6;
  --color-tag-bg: #fdf2ee;
  --color-tag-text: #a3361d;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);

  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 1200px;
  --content-width: 70ch;
  --gap: clamp(16px, 3vw, 32px);
}

/* ─── Dark Mode ─────────────────────────────────────────────────── */
[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-tertiary: #5c5e6a;
  --color-accent: #e85d3a;
  --color-accent-hover: #ff6b4a;
  --color-accent-subtle: #2d1512;
  --color-border: #30363d;
  --color-border-light: #22232d;
  --color-code-bg: #1e1f28;
  --color-tag-bg: #2d1512;
  --color-tag-text: #e85d3a;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.5), 0 2px 4px rgba(0,0,0,0.3);
}

/* ─── Theme Toggle ──────────────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  line-height: 1;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  display: flex;
  align-items: center;
  gap: 4px;
}

.theme-toggle:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.theme-toggle:focus-visible,
.gitlab-link:focus-visible,
.post-card:focus-visible,
.card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle .icon-moon {
  display: none;
}

.theme-toggle .icon-sun {
  display: inline;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: inline;
}

/* ─── Base ─────────────────────────────────────────────────────── */
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  padding-left: max(var(--gap), env(safe-area-inset-left));
  padding-right: max(var(--gap), env(safe-area-inset-right));
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition), 
              color var(--transition), 
              border-color var(--transition),
              box-shadow var(--transition);
}

/* Smooth transitions for static text and container blocks during theme toggle */
.post-content code, pre, th, td, blockquote {
  transition: background-color var(--transition), 
              color var(--transition), 
              border-color var(--transition),
              box-shadow var(--transition);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ─── Navigation ───────────────────────────────────────────────── */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0 24px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  touch-action: manipulation;
}

.nav-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-left h1 {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.tagline {
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
  font-weight: 400;
  letter-spacing: 0.01em;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.gitlab-link {
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.gitlab-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

/* ─── Index: Post List ─────────────────────────────────────────── */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 16px;
}

.post-card {
  display: block;
  padding: 20px 16px;
  border-radius: var(--radius-md);
  touch-action: manipulation;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  color: inherit;
  border: 1px solid transparent;
}

.post-card:hover {
  background: var(--color-surface);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.post-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-text);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.post-card:hover .post-card-title {
  color: var(--color-accent);
}

.post-card-meta {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

.post-card-description {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ─── Single Post ──────────────────────────────────────────────── */
.post {
  background: transparent;
  padding: 0;
  margin-bottom: 30px;
}

.post-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-text);
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.post-meta {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-variant-numeric: tabular-nums;
}

.post-tags {
  display: inline-flex;
  gap: 6px;
  flex-wrap: wrap;
}

.post-tag {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
}

.post-tag:hover {
  background: var(--color-link);
  color: white;
}

.tag-header {
  margin-bottom: 24px;
  font-size: 1.3rem;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}

/* ─── Post Content Typography ──────────────────────────────────── */
.post-content {
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--color-text);
  max-width: min(var(--content-width), 100%);
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.post-content > * + * {
  margin-top: 1.25em;
}

.post-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 2.5em;
  margin-bottom: 0.75em;
  letter-spacing: -0.02em;
  line-height: 1.3;
  scroll-margin-top: 2rem;
}

.post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 2em;
  margin-bottom: 0.5em;
  letter-spacing: -0.01em;
  scroll-margin-top: 2rem;
}

.post-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  scroll-margin-top: 2rem;
}

.post-content p {
  margin-top: 0;
  margin-bottom: 1.25em;
}

.post-content strong {
  font-weight: 600;
  color: var(--color-text);
}

.post-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(188, 65, 35, 0.3);
  transition: text-decoration-color var(--transition);
}

.post-content a:hover {
  text-decoration-color: var(--color-accent);
}

/* ─── Code ─────────────────────────────────────────────────────── */
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-code-bg);
  color: var(--color-text);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  font-weight: 400;
}

.post-content pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  overflow-x: auto;
  margin: 1.75em 0;
  box-shadow: var(--shadow-sm);
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--color-text);
}

/* ─── Blockquote ───────────────────────────────────────────────── */
.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 16px 20px;
  margin: 1.75em 0;
  background: var(--color-accent-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
  font-style: normal;
}

.post-content blockquote p {
  margin-bottom: 0;
}

.post-content blockquote p + p {
  margin-top: 0.75em;
}

/* ─── Lists ────────────────────────────────────────────────────── */
.post-content ul,
.post-content ol {
  padding-left: 1.5em;
  margin: 1em 0;
}

.post-content li {
  margin-bottom: 0.4em;
  line-height: 1.7;
}

.post-content li + li {
  margin-top: 0.25em;
}

/* ─── Tables ───────────────────────────────────────────────────── */
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75em 0;
  font-size: 0.9rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.post-content th,
.post-content td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.post-content th {
  background: var(--color-code-bg);
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.post-content tr:last-child td {
  border-bottom: none;
}

/* ─── Images ───────────────────────────────────────────────────── */
.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1.75em 0;
  border: 1px solid var(--color-border);
}

/* ─── Horizontal Rule ──────────────────────────────────────────── */
.post-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5em 0;
}

/* ─── D2 Diagrams ──────────────────────────────────────────────── */
.d2-diagram {
  /* 1100px matches the natural D2 intrinsic width (~1588px) scaled down
     to a comfortable reading size on desktop. Mobile (≤640px) keeps parent
     via the d2-mobile.css negative-margin breakout; standalone <figure>-wrapped SVGs scroll at very wide sizes. */
  max-width: 1100px;
  margin: 2em auto;
  text-align: center;
}

.d2-diagram img,
.d2-diagram svg {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), 
              box-shadow var(--transition), 
              filter var(--transition), 
              background-color var(--transition);
}

/* Desktop (≥1024px): break the diagram block out of the 70ch reading column
   so the rendered SVG is ~1100px wide instead of being clipped at ~728px.
   Uses viewport-aware negative-margin breakout, clamped so the diagram stays
   within the page gutter on narrower screens (no horizontal scroll). */
@media (min-width: 1024px) {
  .post-content .d2-diagram {
    width: min(1100px, calc(100vw - 2 * var(--gap)));
    margin-left: max(auto, calc(-1 * (min(1100px, calc(100vw - 2 * var(--gap))) - 100%) / 2));
    margin-right: max(auto, calc(-1 * (min(1100px, calc(100vw - 2 * var(--gap))) - 100%) / 2));
  }
}

.d2-diagram img:hover,
.d2-diagram svg:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .d2-diagram img,
[data-theme="dark"] .d2-diagram svg {
  filter: invert(0.9) hue-rotate(180deg);
  background-color: #11141b;
}

/* ─── Comparison Tables ────────────────────────────────────────── */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75em 0;
  font-size: 0.9rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.comparison-table th,
.comparison-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.comparison-table th {
  background: var(--color-code-bg);
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.comparison-table td:first-child {
  font-weight: 500;
}

/* ─── Diagram Cards ────────────────────────────────────────────── */
.diagram-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 1.75em 0;
}

.card-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.card {
  background: var(--color-surface);
  color: var(--color-text);
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
  min-width: 200px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.card h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  font-weight: 600;
}

.card p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.arrow {
  font-size: 1.5em;
  color: var(--color-accent);
  margin: 8px 0;
}

/* ─── Footer ───────────────────────────────────────────────────── */
.site-footer {
  margin-top: 48px;
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 0.82rem;
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 0.82rem;
}

/* ─── Responsive ───────────────────────────────────────────────── */

/* Mobile: < 640px */
@media (max-width: 640px) {
  .nav {
    padding: 20px 0 16px;
  }

  .nav-left h1 {
    font-size: 1.05rem;
  }

  .post-title {
    font-size: clamp(1.35rem, 5vw, 1.5rem);
  }

  .post-content {
    font-size: 1rem;
  }

  .post-card {
    padding: 16px 12px;
  }

  .post-card-title {
    font-size: 0.98rem;
  }

  .post-content pre {
    padding: 16px;
    margin-left: calc(-1 * var(--gap));
    margin-right: calc(-1 * var(--gap));
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  .d2-diagram img,
  .d2-diagram svg {
    border-radius: var(--radius-sm);
  }

  .card {
    min-width: 100%;
  }
}

/* Tablet: 640px - 1024px */
@media (min-width: 641px) and (max-width: 1024px) {
  .post-title {
    font-size: clamp(1.5rem, 3vw, 1.75rem);
  }
}

/* Desktop: > 1024px */
@media (min-width: 1025px) {
  .post-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }
}

/* Wide Desktop: > 1400px */
@media (min-width: 1400px) {
  .post-list {
    grid-template-columns: repeat(3, 1fr);
  }
}