/*
  Global styles for Hai Pham personal blog
  - Minimalist, responsive, accessible
  - Supports light/dark via data-theme on html
*/

:root {
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --card: #f8fafc;
  --brand: #2563eb;
  --brand-hover: #1d4ed8;
  --brand-contrast: #ffffff;
  --code-bg: #0b1020;
  --code-text: #e5e7eb;
}

html[data-theme="dark"] {
  --bg: #0b1020;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --border: #1f2937;
  --card: #10172a;
  --brand: #60a5fa;
  --brand-hover: #3b82f6;
  --brand-contrast: #0b1020;
  --code-bg: #0b1020;
  --code-text: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
main { flex: 1; }

.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header { position: sticky; top: 0; background: var(--bg); border-bottom: 1px solid var(--border); z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.brand { font-weight: 700; font-size: 18px; color: var(--text); }
.nav a { margin-left: 16px; color: var(--muted); }
.nav a.active { color: var(--text); font-weight: 600; }

.theme-toggle { width: 36px; height: 36px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; font-size: 16px; }
html[data-theme="dark"] .theme-toggle { background: #1f2937; color: #f9fafb; border-color: #334155; }

/* Mobile header */
.nav-toggle { display: none; width: 36px; height: 36px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); cursor: pointer; align-items: center; justify-content: center; }
.burger { display: inline-block; width: 18px; height: 2px; background: var(--text); position: relative; }
.burger::before, .burger::after { content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--text); }
.burger::before { top: -6px; }
.burger::after { top: 6px; }

@media (max-width: 640px) {
  .header-actions { gap: 8px; }
  .site-header .nav { position: absolute; top: 60px; right: 16px; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 8px; display: none; flex-direction: column; box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
  .site-header .nav.open { display: flex; }
  .site-header .nav a { margin: 6px 8px; }
  .nav-toggle { display: inline-flex; }
}

.site-footer { border-top: 1px solid var(--border); margin-top: 40px; background: var(--bg); }
.footer-inner { padding: 24px 0; color: var(--muted); font-size: 14px; }
.site-footer .container { padding-left: 16px; padding-right: 16px; max-width: 1100px; margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 16px; }
.footer-copy { grid-column: 1 / -1; justify-self: center; text-align: center; }
.footer-nav a { margin-left: 12px; color: var(--muted); }
.footer-social a { margin-left: 12px; color: var(--muted); }
.footer-nav a:first-child, .footer-social a:first-child { margin-left: 0; }

.hero { display: grid; grid-template-columns: 120px 1fr; gap: 20px; align-items: center; padding: 32px 0; }
.avatar { width: 120px; height: 120px; border-radius: 50%; border: 2px solid var(--border); object-fit: cover; }
.hero-text h1 { margin: 0 0 8px; }
.hero-actions { margin: 20px 0; display: flex; gap: 16px; }
.btn { display: inline-block; padding: 8px 20px; background: var(--brand); color: var(--brand-contrast); border-radius: 8px; border: 1px solid var(--brand); font-weight: 500; font-size: 16px; transition: all 0.2s; }
.btn:hover { background: var(--brand); opacity: 0.9; transform: translateY(-1px); }
.btn-outline { display: inline-block; padding: 8px 20px; background: transparent; color: var(--text); border-radius: 8px; border: 1px solid var(--border); font-weight: 500; font-size: 16px; transition: all 0.2s; }
.btn-outline:hover { background: var(--card); border-color: var(--brand); transform: translateY(-1px); }
.socials { color: var(--muted); display: flex; gap: 8px; align-items: center; }

.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-top: 20px; margin-bottom: 10px; }
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.post-card h3 { margin: 0 0 6px; font-size: 18px; }
.post-card .meta { color: var(--muted); font-size: 13px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.tag { display: inline-block; padding: 2px 8px; border: 1px solid var(--border); border-radius: 999px; font-size: 12px; color: var(--muted); cursor: pointer; }
.tag.active { background: var(--brand); color: var(--brand-contrast); border-color: var(--brand); }

.layout { display: grid; grid-template-columns: 3fr 1fr; gap: 24px; }
.content h1 { margin-top: 18px; }
.post-view { padding-top: 20px; }
.post-meta { display: flex; align-items: center; gap: 12px; margin: 12px 0 20px; color: var(--muted); font-size: 14px; }
.sidebar { display: flex; flex-direction: column; gap: 20px; }
.sidebar .card { margin-bottom: 0; }
.recent-posts { display: flex; flex-direction: column; gap: 8px; }
.recent-post { padding: 8px; border-radius: 6px; background: var(--bg); border: 1px solid var(--border); }
.recent-post h4 { margin: 0 0 4px; font-size: 14px; }
.recent-post .date { color: var(--muted); font-size: 12px; }
.author-links { margin-top: 12px; }
.filters { display: flex; align-items: flex-start; gap: 12px; margin: 12px 0; flex-wrap: wrap; }
#searchInput { flex: 1; height: 40px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--text); }
#searchInput:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }
.tags { margin-top: 0; align-self: center; }
.post-list { display: grid; grid-template-columns: 1fr; gap: 12px; }
.post-item { padding: 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--card); display: grid; gap: 6px; }
.post-item h3 { margin: 0; }
.post-item .excerpt { color: var(--muted); font-size: 14px; }
.pagination { display: flex; gap: 8px; margin: 12px 0; }
.pagination button { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--text); cursor: pointer; }
.pagination button[disabled] { opacity: 0.5; cursor: not-allowed; }

.markdown-body pre { 
  background: var(--code-bg); 
  color: var(--code-text); 
  padding: 12px; 
  border-radius: 10px; 
  overflow-x: auto; 
  border: none !important; 
  position: relative;
}
.markdown-body code { font-family: "JetBrains Mono", "Fira Code", "SF Mono", "Monaco", "Inconsolata", "Roboto Mono", "Source Code Pro", "Cascadia Code", "Consolas", "Liberation Mono", "Courier New", monospace; font-size: 0.9em; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin-top: 22px; }
.markdown-body blockquote { border-left: 3px solid var(--border); padding-left: 12px; color: var(--muted); }

/* Code block copy button */
.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s;
}
.markdown-body pre:hover .code-copy-btn {
  opacity: 1;
}
.code-copy-btn:hover {
  background: var(--brand);
  color: var(--brand-contrast);
  border-color: var(--brand);
}

/* Highlight.js theme overrides */
.hljs {
  background: var(--code-bg) !important;
  color: var(--code-text) !important;
  border: none !important;
}

/* CV Layout */
.cv-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
  margin: 20px 0;
}

.cv-sidebar {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  height: fit-content;
  position: sticky;
  top: 80px;
}

.cv-avatar {
  text-align: center;
  margin-bottom: 24px;
}

.cv-avatar img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 3px solid var(--border);
  object-fit: cover;
}

.cv-contact h3,
.cv-skills h3 {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 14px;
}

.contact-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.contact-item a {
  color: var(--brand);
  text-decoration: none;
}

.contact-item a:hover {
  text-decoration: underline;
}

.skill-category {
  margin-bottom: 20px;
}

.skill-category h4 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}

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

.skill-tag {
  display: inline-block;
  padding: 4px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  color: var(--text);
}

.skill-tag.primary {
  background: var(--brand);
  color: var(--brand-contrast);
  border-color: var(--brand);
}

.skill-tag.learning {
  background: var(--card);
  border-color: var(--brand);
  color: var(--brand);
}

.cv-content {
  background: var(--bg);
}

.cv-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.cv-header h1 {
  margin: 0 0 8px;
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
}

.cv-title {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 500;
  color: var(--brand);
}

.cv-intro {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--muted);
}

.cv-section {
  margin-bottom: 32px;
}

.cv-section h2 {
  margin: 0 0 20px;
  font-size: 24px;
  font-weight: 600;
  color: var(--text);
}

.cv-item {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.cv-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.cv-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
  gap: 16px;
}

.cv-item-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
}

.cv-date {
  font-size: 14px;
  color: var(--muted);
  white-space: nowrap;
}

.cv-item-desc {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-tag {
  display: inline-block;
  padding: 3px 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 12px;
  color: var(--text);
}

.project-links {
  margin-top: 12px;
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--brand);
  color: var(--brand-contrast);
  text-decoration: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.project-links a:hover {
  background: var(--brand-hover);
  color: var(--brand-contrast);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

.goals-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.goal-item h4 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.goal-item ul {
  margin: 0;
  padding-left: 20px;
}

.goal-item li {
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

/* Responsive CV */
@media (max-width: 900px) {
  .cv-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .cv-sidebar {
    position: static;
    order: 2;
  }
  
  .cv-content {
    order: 1;
  }
  
  .goals-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .cv-layout {
    margin: 10px 0;
  }
  
  .cv-sidebar {
    padding: 16px;
  }
  
  .cv-avatar img {
    width: 100px;
    height: 100px;
  }
  
  .cv-header h1 {
    font-size: 28px;
  }
  
  .cv-title {
    font-size: 16px;
  }
  
  .cv-item-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  
  .cv-date {
    font-size: 13px;
  }
}

@media (max-width: 900px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .layout { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; }
  .avatar { width: 96px; height: 96px; }
  .post-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 8px; }
  .footer-nav, .footer-social { display: flex; flex-wrap: wrap; gap: 8px; }
  .filters { flex-direction: column; align-items: stretch; gap: 8px; }
  .filters #searchInput { flex: none; width: 100%; }
  .filters .tags { margin-top: 0; }
  .hero-actions { flex-direction: column; gap: 12px; }
  .btn, .btn-outline { width: 100%; text-align: center; }
}

/* Mermaid diagrams styling */
.mermaid {
  text-align: center;
  margin: 1.5rem 0;
  background: var(--card);
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid var(--border);
}

.mermaid svg {
  max-width: 100%;
  height: auto;
}

/* Dark mode for Mermaid */
html[data-theme="dark"] .mermaid {
  background: var(--card);
  border-color: var(--border);
}