/* Modern Minimalist UI Design Guide - Softer Tech Aesthetic */

:root {
  /* 60-30-10 Color Scheme (Light Mode - Soft Stone Contrast) */
  --bg-primary: #f5f5f4;      /* Soft Warm Stone Alabaster */
  --bg-secondary: #e7e5e4;    /* Slightly darker stone for cards/elements */
  --text-primary: #292524;     /* Softer stone-800 off-black */
  --text-secondary: #57534e;   /* stone-600 */
  --accent: #0284c7;           /* Softer sky-600 blue */
  --accent-hover: #0369a1;     /* sky-700 */
  --border-color: #d6d3d1;     /* stone-300 */
  --code-bg: #e7e5e4;          /* stone-200 */

  /* Typography & Grid */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --max-width: 960px; /* Layout container for desktop */
}

@media (prefers-color-scheme: dark) {
  :root {
    /* 60-30-10 Color Scheme (Dark Mode - Zinc Charcoal) */
    --bg-primary: #18181b;     /* Softer Zinc Charcoal (zinc-900) instead of pure black */
    --bg-secondary: #27272a;   /* zinc-800 */
    --text-primary: #e4e4e7;   /* zinc-200 off-white */
    --text-secondary: #a1a1aa; /* zinc-400 */
    --accent: #38bdf8;         /* Softer sky-400 accent */
    --accent-hover: #7dd3fc;   /* sky-300 */
    --border-color: #27272a;   /* zinc-800 */
    --code-bg: #27272a;        /* zinc-800 */
  }
}

/* Base Reset & Globals */
* {
  box-sizing: border-box;
}

body {
  margin: 0 auto;
  padding: 48px 24px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  max-width: var(--max-width);
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography & Hierarchy (Mathematical spacing) */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin-top: 40px;
  margin-bottom: 16px;
}

h1 {
  font-size: 2.25rem;
}

h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
  margin-top: 48px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 32px;
}

p {
  margin-top: 0;
  margin-bottom: 24px;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

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

/* Header: centered masked logo recolored per theme */
header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px 0 32px 0;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: block;
  width: 336px;
  max-width: 80vw;
  height: 96px;
  border-bottom: none;
  background-color: var(--text-primary);
  -webkit-mask: url("/static/logo-mask.png") center / contain no-repeat;
  mask: url("/static/logo-mask.png") center / contain no-repeat;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.logo:hover {
  background-color: var(--accent);
  transform: rotate(-1.5deg);
  border-bottom: none;
}

/* Intro Section */
.intro {
  margin-bottom: 48px;
}

.intro-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  margin-top: 0;
}

.intro-bio {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Featured Projects Section */
.featured-projects {
  margin-bottom: 48px;
}

.section-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.project-card {
  background-color: var(--bg-secondary);
  padding: 20px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  border-top: 4px solid var(--accent);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
  border-color: var(--accent);
  border-top-color: var(--accent);
  transform: translateY(-2px);
}

.project-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 8px;
}

.project-title a {
  color: var(--text-primary);
  border-bottom: none;
}

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

.project-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* Notes & Lists grouped by year */
.notes-section {
  margin-bottom: 48px;
}

.posts-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.year-group {
  margin-top: 32px;
  margin-bottom: 8px;
}

.year-group:first-child {
  margin-top: 0;
}

.year-title {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.post-item {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-color);
}

.post-item:last-child {
  border-bottom: none;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  min-width: 60px;
  flex-shrink: 0;
}

.post-item a.articlelist {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: none;
  display: inline-flex;
  align-items: center;
  transition: color 0.15s ease, transform 0.15s ease;
}

.post-item a.articlelist::before {
  content: ">";
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-right: 8px;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.post-item a.articlelist:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.post-item a.articlelist:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.category-tag {
  margin-left: auto;
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--accent);
  color: var(--text-secondary);
}

/* Article specific styling (inside posts/projects details) */
article {
  margin: 32px auto 0; /* center the prose reading column */
  max-width: 70ch;
}

article h2 {
  margin-top: 40px;
  font-size: 1.8rem;
  font-weight: 700;
  border-bottom: none;
  padding-bottom: 0;
}

article p {
  margin-bottom: 24px;
}

article p img {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  margin: 8px 0 24px;
}

article ul, article ol {
  margin-bottom: 24px;
  padding-left: 20px;
}

/* Reset post list styles for markdown list items inside posts */
article ul li, article ol li {
  display: list-item;
  justify-content: initial;
  align-items: initial;
  padding: 4px 0;
  border-bottom: none;
  gap: 0;
}

/* Code syntax highlighting & PrismJS integrations */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--code-bg);
  padding: 3px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

pre {
  background-color: var(--code-bg);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  margin: 32px 0;
}

pre code {
  background-color: transparent;
  padding: 0;
  border: none;
  border-radius: 0;
  font-size: 0.9rem;
}

/* Dark mode Prism syntax highlighting overrides */
@media (prefers-color-scheme: dark) {
  code[class*="language-"],
  pre[class*="language-"] {
    background: var(--code-bg) !important;
    color: var(--text-primary) !important;
    text-shadow: none !important;
  }
  
  .token.comment,
  .token.prolog,
  .token.doctype,
  .token.cdata {
    color: #6272a4 !important;
  }
  
  .token.punctuation {
    color: #f8f8f2 !important;
  }
  
  .token.property,
  .token.tag,
  .token.constant,
  .token.symbol,
  .token.deleted {
    color: #ff79c6 !important;
  }
  
  .token.boolean,
  .token.number {
    color: #bd93f9 !important;
  }
  
  .token.selector,
  .token.attr-name,
  .token.string,
  .token.char,
  .token.builtin,
  .token.inserted {
    color: #50fa7b !important;
  }
  
  .token.operator,
  .token.entity,
  .token.url,
  .language-css .token.string,
  .style .token.string {
    color: #f8f8f2 !important;
  }
  
  .token.atrule,
  .token.attr-value,
  .token.function,
  .token.class-name {
    color: #f1fa8c !important;
  }
  
  .token.keyword {
    color: #ff79c6 !important;
  }
  
  .token.regex,
  .token.important,
  .token.variable {
    color: #f1fa8c !important;
  }
}

/* Blockquotes */
blockquote {
  border-left: 3px solid var(--accent);
  margin: 24px 0;
  padding: 8px 16px;
  background-color: var(--bg-secondary);
  border-radius: 0 6px 6px 0;
  font-style: italic;
  color: var(--text-secondary);
}

blockquote p {
  margin-bottom: 0;
}

/* Footer layout */
footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

footer p {
  margin: 0;
}

footer a {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: none;
}

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

/* Post Gallery Grid */
.post-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin: 48px 0 0;
}

.post-gallery a {
  display: block;
  overflow: hidden;
  border-radius: 8px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.post-gallery a:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  border-bottom: none;
}

.post-gallery img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

/* Responsive & Mobile-first media queries */
@media only screen and (max-width: 576px) {
  body {
    padding: 24px 16px;
  }

  header {
    gap: 16px;
    margin-bottom: 32px;
  }

  /* Mobile Nav checkbox hack refinement */
  .hamburger {
    display: flex;
  }

  header nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 12px;
    padding: 0;
    background: var(--bg-primary);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease-out, padding 0.25s ease-out;
    z-index: 100;
    border-bottom: none;
  }

  .nav-toggle:checked ~ nav {
    max-height: 200px;
    padding: 16px 0 8px 0;
    border-bottom: 1px solid var(--border-color);
  }

  /* Hamburger lines animation when toggle checked */
  .nav-toggle:checked ~ .hamburger span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .nav-toggle:checked ~ .hamburger span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle:checked ~ .hamburger span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  header nav a {
    width: 100%;
    padding: 8px 0;
    font-size: 1rem;
  }
  
  .project-grid {
    grid-template-columns: 1fr;
  }
  
  .post-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 12px 0;
  }

  .post-item a.articlelist:hover {
    transform: none;
  }

  .category-tag {
    margin-left: 0;
  }

  .post-gallery {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
  }

  .post-gallery img {
    height: 140px;
  }
  
  footer {
    align-items: center;
  }
}