/* ============================================
   Blog Knowledge Graph — Excalidraw-style
   ============================================ */

@font-face {
  font-family: 'Virgil';
  src: url('../assets/fonts/Virgil.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* --- Reset & Base --- */

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  background: #FAFAF8;
  color: #1e1e1e;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* --- Layout --- */

#app {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

/* --- Graph Container --- */

#graph-container {
  width: 100%;
  height: 100%;
  transform-origin: center center;
}

#graph-container.shifting {
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

#graph-container.shifted {
  transform: translateX(-15%);
  opacity: 0.6;
}

#graph-container svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Graph Nodes (SVG) --- */

.node {
  cursor: pointer;
}

.node:hover path {
  stroke-width: 2.5;
}

.node text {
  font-family: 'Virgil', cursive;
  fill: #1e1e1e;
  pointer-events: none;
  user-select: none;
}

.node .node-title {
  font-size: 15px;
}

.node .node-subtitle {
  font-size: 11px;
  fill: #666;
}

/* --- Graph Edges --- */

.edge {
  fill: none;
  stroke: #c0bfbc;
  stroke-width: 1.5;
  stroke-linecap: round;
  opacity: 0.5;
}

.edge.highlighted {
  opacity: 0.9;
  stroke: #868583;
  stroke-width: 2;
  transition: opacity 0.2s ease, stroke 0.2s ease;
}

.edge.dimmed {
  opacity: 0.15;
  transition: opacity 0.2s ease, stroke 0.2s ease;
}

/* --- Edge Labels --- */

.edge-label {
  font-family: 'Virgil', cursive;
  font-size: 11px;
  fill: #999;
  pointer-events: none;
  user-select: none;
}

.edge-label.highlighted {
  fill: #666;
  opacity: 1;
  transition: opacity 0.2s ease, fill 0.2s ease;
}

.edge-label.dimmed {
  opacity: 0.1;
  transition: opacity 0.2s ease, fill 0.2s ease;
}

.node.dimmed rect {
  opacity: 0.4;
}

.node.dimmed text {
  opacity: 0.4;
}

/* --- Post Panel --- */

#post-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 55%;
  max-width: 720px;
  height: 100%;
  background: #FAFAF8;
  border-left: 2px solid #e8e6e3;
  transform: translateX(100%);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
  overflow-y: auto;
  overscroll-behavior: contain;
  will-change: transform;
}

#post-panel.open {
  transform: translateX(0);
  box-shadow: -8px 0 30px rgba(0, 0, 0, 0.08);
}

#post-panel .post-inner {
  padding: 48px 48px 80px;
  max-width: 600px;
}

/* --- Post Header --- */

.post-close {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: flex-end;
  padding: 16px 24px;
  background: linear-gradient(to bottom, #FAFAF8 60%, transparent);
  z-index: 10;
}

.post-close button {
  background: none;
  border: 2px solid #d4d2cf;
  border-radius: 8px;
  width: 40px;
  height: 40px;
  font-size: 20px;
  color: #666;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  font-family: 'Virgil', cursive;
}

.post-close button:hover {
  background: #eeedeb;
  color: #1e1e1e;
  border-color: #b0aeab;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.post-date {
  font-size: 14px;
  color: #888;
}

.post-category {
  font-family: 'Virgil', cursive;
  font-size: 13px;
  padding: 2px 12px;
  border-radius: 12px;
  display: inline-block;
}

.post-title {
  font-family: 'Virgil', cursive;
  font-size: 32px;
  line-height: 1.3;
  margin-bottom: 8px;
  color: #1e1e1e;
}

.post-subtitle {
  font-size: 17px;
  color: #777;
  margin-bottom: 32px;
  line-height: 1.5;
}

/* --- Post Content --- */

.post-content {
  font-size: 16px;
  line-height: 1.75;
  color: #2c2c2c;
}

.post-content p {
  margin-bottom: 1.2em;
}

.post-content h2 {
  font-family: 'Virgil', cursive;
  font-size: 22px;
  margin: 2em 0 0.8em;
  color: #1e1e1e;
}

.post-content h3 {
  font-family: 'Virgil', cursive;
  font-size: 18px;
  margin: 1.6em 0 0.6em;
  color: #1e1e1e;
}

.post-content blockquote {
  border-left: 3px solid #d4d2cf;
  padding-left: 20px;
  margin: 1.5em 0;
  color: #555;
  font-style: italic;
}

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

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

.post-content code {
  background: #eeedeb;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.post-content pre {
  background: #eeedeb;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5em 0;
}

.post-content pre code {
  background: none;
  padding: 0;
}

.post-content a {
  color: #5b8def;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-content hr {
  border: none;
  border-top: 1.5px solid #e8e6e3;
  margin: 2em 0;
}

/* --- Related Posts --- */

.post-related {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1.5px solid #e8e6e3;
}

.post-related h3 {
  font-family: 'Virgil', cursive;
  font-size: 16px;
  color: #888;
  margin-bottom: 12px;
}

.post-related-list {
  list-style: none;
  padding: 0;
}

.post-related-list li {
  margin-bottom: 8px;
}

.post-related-list a {
  font-family: 'Virgil', cursive;
  font-size: 15px;
  color: #5b8def;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s ease;
}

.post-related-list a:hover {
  color: #3a6ed8;
  text-decoration: underline;
}

/* --- Category Colors (semantic clusters) --- */

.category-governance   { background: #daeef3; color: #3a7f91; }
.category-epistemics   { background: #e8dff5; color: #6e44a0; }
.category-critique     { background: #fef0d5; color: #9e7a1b; }
.category-technology   { background: #daeef3; color: #3a7f91; }
.category-philosophy   { background: #e8dff5; color: #6e44a0; }
.category-culture      { background: #fef0d5; color: #9e7a1b; }
.category-science      { background: #dcedc8; color: #4a7c2e; }
.category-personal     { background: #fce4ec; color: #ad3a5e; }

/* --- SVG Hand-drawn Filter (applied via defs) --- */

/* --- Responsive --- */

@media (max-width: 900px) {
  #post-panel {
    width: 100%;
    max-width: none;
    border-left: none;
  }

  #graph-container.shifted {
    transform: scale(0.9);
    opacity: 0.3;
  }

  #post-panel .post-inner {
    padding: 32px 24px 64px;
  }

  .post-title {
    font-size: 26px;
  }
}

@media (max-width: 600px) {
  #post-panel .post-inner {
    padding: 24px 16px 48px;
  }

  .post-title {
    font-size: 22px;
  }

  .post-content {
    font-size: 15px;
  }
}