/* ============================================
   SWISS STACKED IDENTITY THEME
   Tim Searle's Blog
   ============================================ */

/* --------------------------------------------
   CSS CUSTOM PROPERTIES (Light Mode Default)
   -------------------------------------------- */
:root {
  /* Colors - Light Mode */
  --color-bg: #FAFAFA;
  --color-bg-alt: #E8E8E8;
  --color-bg-code-inline: #DEDEDE;
  --color-text: #0D0D0D;
  --color-text-secondary: #5C5C5C;
  --color-text-tertiary: #737373;
  --color-accent: #B14728;
  --color-accent-hover: #963D22;
  --color-border: #D4D4D4;
  --color-code-bg: #0D0D0D;
  --color-code-text: #FAFAFA;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  /* Spacing */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --space-12: 96px;

  /* Layout */
  --max-width: 680px;
  --header-max-width: 900px;
}

/* --------------------------------------------
   DARK MODE
   -------------------------------------------- */
[data-theme="dark"] {
  --color-bg: #0D0D0D;
  --color-bg-alt: #1A1A1A;
  --color-bg-code-inline: #262626;
  --color-text: #F5F5F5;
  --color-text-secondary: #A0A0A0;
  --color-text-tertiary: #7A7A7A;
  --color-accent: #F07352;
  --color-accent-hover: #FF8A6A;
  --color-border: #2A2A2A;
  --color-code-bg: #000000;
  --color-code-text: #F5F5F5;
}

/* --------------------------------------------
   RESET & BASE
   -------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------
   THEME TOGGLE
   -------------------------------------------- */
.theme-toggle {
  position: fixed;
  top: var(--space-3);
  right: var(--space-3);
  background: transparent;
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  color: var(--color-text-tertiary);
  z-index: 100;
  transition: color 0.2s, border-color 0.2s;
}

.theme-toggle:hover,
.theme-toggle:focus {
  color: var(--color-text);
  border-color: var(--color-text);
  outline: none;
}

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

/* --------------------------------------------
   HEADER
   -------------------------------------------- */
.site-header {
  padding: var(--space-8) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--header-max-width);
  margin: 0 auto;
}

.site-identity {
  margin-bottom: var(--space-6);
}

.site-name {
  display: block;
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 0.9;
  color: var(--color-text);
  text-decoration: none;
}

.site-name:hover {
  color: var(--color-text);
}

.site-name-line {
  display: block;
}

.site-location {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-top: var(--space-3);
}

.site-bio {
  display: block;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-top: var(--space-3);
  max-width: 420px;
  line-height: 1.5;
}

/* Navigation */
.site-nav {
  display: flex;
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.site-nav a {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding-bottom: var(--space-1);
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--color-text);
}

.site-nav a.active {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
}

/* --------------------------------------------
   MAIN CONTENT
   -------------------------------------------- */
.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
  flex: 1;
  width: 100%;
}

/* --------------------------------------------
   SECTION HEADER
   -------------------------------------------- */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-text-tertiary);
}

.section-count {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-tertiary);
}

/* --------------------------------------------
   POST LIST (Home Page)
   -------------------------------------------- */
.post-list {
  list-style: none;
}

.post-item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

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

.post-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-tertiary);
  padding-top: 3px;
}

.post-content h2 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.3;
  margin-bottom: var(--space-1);
}

.post-content h2 a {
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s;
}

.post-content h2 a:hover {
  color: var(--color-accent);
}

.post-excerpt {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  font-weight: 400;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-accent);
  text-transform: uppercase;
  text-decoration: none;
}

.tag:hover {
  color: var(--color-accent-hover);
}

/* Section Divider */
.section-divider {
  height: 3px;
  background: var(--color-accent);
  margin: var(--space-8) 0;
}

/* --------------------------------------------
   ARTICLE (Post Page)
   -------------------------------------------- */
.article-header {
  margin-bottom: var(--space-6);
  padding: 0;
  border: none;
}

.article-meta {
  display: flex;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.article-title {
  font-size: 1.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

/* Article Content */
.article-content {
  font-size: 1rem;
}

.article-content p {
  margin-bottom: var(--space-3);
  font-weight: 400;
}

.article-content h1 {
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin: var(--space-8) 0 var(--space-3);
}

.article-content h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text);
  margin: var(--space-6) 0 var(--space-2);
}

.article-content h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin: var(--space-4) 0 var(--space-2);
}

.article-content h4,
.article-content h5,
.article-content h6 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin: var(--space-3) 0 var(--space-2);
}

.article-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}

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

/* Lists */
.article-content ul,
.article-content ol {
  margin: var(--space-3) 0;
  padding-left: var(--space-4);
}

.article-content li {
  margin-bottom: var(--space-1);
}

.article-content li > ul,
.article-content li > ol {
  margin-top: var(--space-1);
  margin-bottom: 0;
}

/* Code Blocks */
.article-content pre,
pre.highlight,
.highlight pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: var(--space-3);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  margin: var(--space-4) 0;
  border-radius: 0;
}

.article-content pre code,
pre.highlight code,
.highlight pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

/* Inline Code */
.article-content code,
p code,
li code,
td code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-code-inline);
  padding: 0.15em 0.35em;
  border-radius: 2px;
}

/* Blockquotes */
.article-content blockquote,
blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-3);
  background: var(--color-bg-alt);
  font-size: 0.9rem;
  border-left: 3px solid var(--color-accent);
}

.article-content blockquote p,
blockquote p {
  margin-bottom: var(--space-2);
}

.article-content blockquote p:last-child,
blockquote p:last-child {
  margin-bottom: 0;
}

.article-content blockquote strong,
blockquote strong {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}

/* Tables */
.article-content table,
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: 0.85rem;
  overflow-x: auto;
  display: block;
}

.article-content thead,
thead {
  border-bottom: 2px solid var(--color-border);
}

.article-content th,
th {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  text-align: left;
  padding: var(--space-2);
}

.article-content td,
td {
  padding: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

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

/* Images */
.article-content img,
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--space-4) 0;
}

.article-content figure {
  margin: var(--space-4) 0;
}

.article-content figcaption {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  text-align: center;
  margin-top: var(--space-1);
}

/* Horizontal Rule */
.article-content hr,
hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-6) 0;
}

/* --------------------------------------------
   PAGE LAYOUT (About, etc.)
   -------------------------------------------- */
.page-header {
  margin-bottom: var(--space-6);
  padding: 0;
  border: none;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

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

.page-content p {
  margin-bottom: var(--space-3);
}

.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4,
.page-content h5,
.page-content h6 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

.page-content h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.page-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.page-content ul,
.page-content ol {
  margin: var(--space-3) 0;
  padding-left: var(--space-4);
}

.page-content li {
  margin-bottom: var(--space-1);
}

/* Apply same content styles */
.page-content pre,
.page-content code,
.page-content blockquote,
.page-content table,
.page-content img {
  /* Inherit from article-content via shared rules above */
}

/* --------------------------------------------
   FOOTER
   -------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) var(--space-4);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-section {
  margin-bottom: var(--space-4);
}

.footer-title {
  font-size: 0.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-2);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-links svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.footer-copy {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: 0.65rem;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --------------------------------------------
   SYNTAX HIGHLIGHTING
   -------------------------------------------- */
.highlight {
  margin: var(--space-4) 0;
}

/* Rouge syntax highlighting - Dark theme for code blocks */
.highlight .c,
.highlight .c1,
.highlight .cm { color: #6a9955; } /* Comments */
.highlight .k,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr { color: #569cd6; } /* Keywords */
.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx { color: #ce9178; } /* Strings */
.highlight .na,
.highlight .nb,
.highlight .nc,
.highlight .nd,
.highlight .ne,
.highlight .nf,
.highlight .ni,
.highlight .nl,
.highlight .nn,
.highlight .no,
.highlight .nt,
.highlight .nv { color: #4ec9b0; } /* Names */
.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo { color: #b5cea8; } /* Numbers */
.highlight .o,
.highlight .ow { color: #d4d4d4; } /* Operators */
.highlight .p { color: #d4d4d4; } /* Punctuation */
.highlight .err { color: #f44747; } /* Errors */

/* --------------------------------------------
   MERMAID DIAGRAMS
   -------------------------------------------- */
.mermaid {
  margin: var(--space-4) 0;
  background: var(--color-bg-alt);
  padding: var(--space-3);
  text-align: center;
}

/* --------------------------------------------
   SLIDES COMPONENT
   -------------------------------------------- */
.slide-container {
  margin: var(--space-4) 0;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.slide-container input[type="range"] {
  accent-color: var(--color-accent);
}

/* --------------------------------------------
   RESPONSIVE DESIGN
   -------------------------------------------- */

/* Mobile (≤600px) */
@media (max-width: 600px) {
  :root {
    --space-8: 48px;
  }

  .site-header {
    padding: var(--space-6) var(--space-3);
  }

  .site-name {
    font-size: 2rem;
  }

  .site-bio {
    font-size: 0.85rem;
  }

  .site-nav {
    gap: var(--space-3);
  }

  .site-main {
    padding: var(--space-6) var(--space-3);
  }

  .post-item {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .post-date {
    padding-top: 0;
    margin-bottom: var(--space-1);
  }

  .article-title {
    font-size: 1.35rem;
  }

  .page-title {
    font-size: 1.25rem;
  }

  .theme-toggle {
    top: var(--space-2);
    right: var(--space-2);
    padding: 6px 10px;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-2);
  }

  /* Tables scroll horizontally on mobile */
  .article-content table,
  table {
    font-size: 0.75rem;
  }
}

/* Tablet (601-900px) */
@media (min-width: 601px) and (max-width: 900px) {
  .site-header {
    padding: var(--space-6) var(--space-4);
  }

  .site-name {
    font-size: 3rem;
  }
}

/* Desktop (>900px) */
@media (min-width: 901px) {
  .site-main {
    padding: var(--space-8) var(--space-4);
  }
}

/* --------------------------------------------
   UTILITIES
   -------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Print styles */
@media print {
  .theme-toggle,
  .site-nav,
  .site-footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .article-content a {
    color: black;
    text-decoration: underline;
  }

  .article-content a::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}