/* ============================================
   Taomaker - MIT-Inspired Theme
   Technical, Approachable, Trustworthy
   ============================================ */

/* ============================================
   Reset & Base Styles
   ============================================ */

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

:root {
  /* MIT-Inspired Color Palette */
  --color-bg: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-card: #ffffff;

  --color-primary: #A31F34;        /* MIT Cardinal Red */
  --color-primary-dark: #8a1a2c;
  --color-primary-light: #c92d47;

  --color-text: #2d2d2d;           /* Near black for readability */
  --color-text-medium: #5a5a5a;    /* Medium gray */
  --color-text-light: #8A8B8C;     /* MIT gray */

  --color-border: #e0e0e0;
  --color-border-light: #f0f0f0;

  /* Typography - Clean sans-serif stack */
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

  /* Spacing System */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 4rem;

  /* Layout */
  --max-width: 760px;
  --max-width-wide: 1200px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
}

html {
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-xl);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

h1:first-child,
h2:first-child,
h3:first-child {
  margin-top: 0;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
}

h3 {
  font-size: 1.35rem;
  font-weight: 600;
}

h4 {
  font-size: 1.125rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

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

/* ============================================
   Layout
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.site-main {
  min-height: 70vh;
  padding: var(--space-xl) 0 var(--space-xxl) 0;
}

/* ============================================
   Header
   ============================================ */

.site-header {
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
  padding: var(--space-lg) 0;
  margin-bottom: var(--space-xl);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}

.site-title a {
  color: var(--color-text);
  text-decoration: none;
}

.site-title a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: var(--space-lg);
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--color-text-medium);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xxl);
  padding: var(--space-xl) 0 var(--space-lg) 0;
  background: var(--color-bg-light);
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.site-footer p {
  margin: var(--space-xs) 0;
}

.site-footer .container {
  text-align: center;
}

.tagline {
  font-style: normal;
  color: var(--color-text-medium);
}

/* ============================================
   Home Page
   ============================================ */

.hero {
  text-align: center;
  margin-bottom: var(--space-xxl);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.hero h1 {
  font-size: 2.75rem;
  margin-bottom: var(--space-md);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.lead {
  font-size: 1.15rem;
  color: var(--color-text-medium);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

.latest-content {
  margin-bottom: var(--space-xxl);
}

.latest-content > h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
  font-weight: 600;
}

.type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.type-card {
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  padding: var(--space-lg);
  border-radius: 2px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.type-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.type-card h3 {
  margin-top: 0;
  margin-bottom: var(--space-sm);
  font-size: 1.25rem;
  color: var(--color-text);
}

.type-card p {
  color: var(--color-text-medium);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

/* ============================================
   Post List
   ============================================ */

.post-list {
  list-style: none;
}

.post-card {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border-light);
  transition: transform 0.2s ease;
}

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

.post-card h2,
.post-card h3 {
  margin: 0 0 var(--space-xs) 0;
  font-size: 1.4rem;
  font-weight: 600;
}

.post-card h2 a,
.post-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.post-card h2 a:hover,
.post-card h3 a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.post-meta {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.post-card > p {
  color: var(--color-text-medium);
  line-height: 1.6;
}

.content-type {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  color: var(--color-primary);
}

/* ============================================
   Tags
   ============================================ */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg-light);
  color: var(--color-text-medium);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.tag:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* ============================================
   Individual Post
   ============================================ */

.post-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-border);
}

.post-header h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  line-height: 1.2;
  font-weight: 700;
}

.post-content {
  margin-bottom: var(--space-xxl);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 2px;
  margin: var(--space-xl) 0;
  border: 1px solid var(--color-border-light);
}

.post-content ul,
.post-content ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.post-content li {
  margin-bottom: var(--space-xs);
  line-height: 1.7;
}

.post-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-md);
  margin: var(--space-xl) 0;
  font-style: italic;
  color: var(--color-text-medium);
}

.post-content code {
  background: var(--color-bg-light);
  padding: 0.2em 0.5em;
  border-radius: 2px;
  font-size: 0.9em;
  font-family: var(--font-mono);
  border: 1px solid var(--color-border-light);
}

.post-content pre {
  background: var(--color-bg-light);
  padding: var(--space-md);
  border-radius: 2px;
  overflow-x: auto;
  margin: var(--space-lg) 0;
  border: 1px solid var(--color-border);
  line-height: 1.5;
}

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

/* ============================================
   Resource Links
   ============================================ */

.resource-link {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: var(--color-bg-light);
  border-left: 3px solid var(--color-primary);
}

.resource-category {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: var(--space-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.external-link {
  display: inline-flex;
  align-items: center;
  margin-top: var(--space-sm);
  color: var(--color-primary);
  font-weight: 500;
  gap: 0.25rem;
}

.external-link:hover {
  color: var(--color-primary-dark);
}

.external-link::after {
  content: "→";
  font-size: 1.2em;
}

/* ============================================
   Buttons
   ============================================ */

.button {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: var(--color-primary);
  color: white;
  border-radius: 2px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.1s ease;
  font-size: 0.95rem;
  border: 2px solid var(--color-primary);
}

.button:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ============================================
   Related Content
   ============================================ */

.related-content {
  margin-top: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: 2px solid var(--color-border);
}

.related-content h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
  font-weight: 600;
}

/* ============================================
   Archive Pages
   ============================================ */

.archive-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-border);
}

.archive-header h1 {
  margin-bottom: var(--space-sm);
  font-size: 2.25rem;
  font-weight: 700;
}

.archive-header p {
  color: var(--color-text-medium);
  font-size: 1.1rem;
  line-height: 1.6;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .lead {
    font-size: 1.05rem;
  }

  .post-header h1 {
    font-size: 1.85rem;
  }

  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .site-nav {
    width: 100%;
    gap: var(--space-md);
  }

  .type-grid {
    grid-template-columns: 1fr;
  }

  .site-main {
    padding: var(--space-lg) 0;
  }
}

@media (max-width: 480px) {
  .site-nav {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  .site-header,
  .site-footer,
  .site-nav,
  .related-content,
  .button {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  a {
    color: black;
    text-decoration: underline;
  }
}