/* ==========================================================================
   Twill Theme — style.css
   Sections: 1. Fonts  2. Custom Properties  3. Reset  4. Typography  5. Layout
             6. Header/Nav  7. Post Cards  8. Article  9. Tag Pills  10. Footer
             11. 404  12. Accessibility  13. Transitions  14. Responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Font Imports
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Bitter:ital,wght@0,400;0,600;1,400&family=JetBrains+Mono:wght@400&display=swap');

/* --------------------------------------------------------------------------
   2. CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Light mode palette */
  --color-dark-primary:   #1E3044;
  --color-dark-secondary: #2D3E2A;
  --color-mid-accent:     #4A5E3C;
  --color-warm-accent:    #9B7340;
  --color-light-accent:   #C9B896;
  --color-background:     #F4F0E8;
  --color-text:           #1E3044;

  /* Code blocks */
  --color-code-bg:        #1E3044;
  --color-inline-code-bg: #E8E2D6;
  --color-inline-code-fg: #1E3044;

  /* Syntax highlighting */
  --syn-keyword:   #2D3E2A;
  --syn-string:    #9B7340;
  --syn-comment:   #8A8A78;
  --syn-function:  #1E3044;
  --syn-number:    #6B5B3A;
  --syn-operator:  #4A5E3C;
  --syn-type:      #4A5E3C;

  /* Derived / semantic */
  --color-text-secondary: var(--color-mid-accent);
  --color-text-tertiary:  #6B7B5C;
  --color-border:         var(--color-light-accent);
  --color-tag-bg:         #E8E2D6;
  --color-tag-fg:         #4A5E3C;
  --color-link:           var(--color-warm-accent);
  --color-footer-bg:      #1E3044;
  --color-footer-text:    #F4F0E8;

  /* Header gradient */
  --gradient-header: linear-gradient(135deg, #1E3044 0%, #2D3E2A 100%);

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body:    'Bitter', serif;
  --font-code:    'JetBrains Mono', monospace;

  /* Spacing */
  --content-width: 740px;
}

/* Dark mode — applied via data attribute or system preference */
[data-theme="dark"] {
    --color-background:     #1A1816;
    --color-dark-primary:   #1A1816;
    --color-dark-secondary: #242018;
    --color-text:           #E0D8C8;
    --color-text-secondary: #B8B0A0;
    --color-text-tertiary:  #8A8070;
    --color-mid-accent:     #7A9A6A;
    --color-warm-accent:    #C49A5C;
    --color-light-accent:   #302A22;
    --color-border:         #302A22;
    --color-tag-bg:         #2A2420;
    --color-tag-fg:         #7A9A6A;
    --color-link:           #C49A5C;
    --color-footer-bg:      #0E0C0A;
    --color-footer-text:    #E0D8C8;

    /* Code blocks */
    --color-code-bg:        #0E0C0A;
    --color-inline-code-bg: #2A2420;
    --color-inline-code-fg: #C49A5C;

    /* Syntax highlighting */
    --syn-keyword:   #8BA07A;
    --syn-string:    #C49A5C;
    --syn-comment:   #5A5548;
    --syn-function:  #E0D8C8;
    --syn-number:    #C49A5C;
    --syn-operator:  #7A9A6A;
    --syn-type:      #7A9A6A;

    /* Header gradient */
    --gradient-header: linear-gradient(135deg, #141210 0%, #121A14 100%);
}

/* Fallback: respect OS preference when no explicit choice is saved */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-background:     #1A1816;
    --color-dark-primary:   #1A1816;
    --color-dark-secondary: #242018;
    --color-text:           #E0D8C8;
    --color-text-secondary: #B8B0A0;
    --color-text-tertiary:  #8A8070;
    --color-mid-accent:     #7A9A6A;
    --color-warm-accent:    #C49A5C;
    --color-light-accent:   #302A22;
    --color-border:         #302A22;
    --color-tag-bg:         #2A2420;
    --color-tag-fg:         #7A9A6A;
    --color-link:           #C49A5C;
    --color-footer-bg:      #0E0C0A;
    --color-footer-text:    #E0D8C8;

    /* Code blocks */
    --color-code-bg:        #0E0C0A;
    --color-inline-code-bg: #2A2420;
    --color-inline-code-fg: #C49A5C;

    /* Syntax highlighting */
    --syn-keyword:   #8BA07A;
    --syn-string:    #C49A5C;
    --syn-comment:   #5A5548;
    --syn-function:  #E0D8C8;
    --syn-number:    #C49A5C;
    --syn-operator:  #7A9A6A;
    --syn-type:      #7A9A6A;

    /* Header gradient */
    --gradient-header: linear-gradient(135deg, #141210 0%, #121A14 100%);
  }
}

/* --------------------------------------------------------------------------
   3. Reset / Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

body, h1, h2, h3, h4, p, ul, ol, figure, blockquote {
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:visited {
  color: var(--color-link);
}

/* --------------------------------------------------------------------------
   4. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
  margin-top: 3rem;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h4 {
  font-size: 1.125rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.5rem;
}

code, pre, kbd, samp {
  font-family: var(--font-code);
}

/* --------------------------------------------------------------------------
   5. Layout
   -------------------------------------------------------------------------- */
.content-wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  padding-top: 3rem;
  padding-bottom: 2rem;
}

/* --------------------------------------------------------------------------
   6. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  background: var(--gradient-header);
  padding: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

.nav-left .site-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: #F4F0E8;
  text-decoration: none;
  white-space: nowrap;
}

.nav-left .site-name:hover {
  text-decoration: none;
  opacity: 0.85;
}

.nav-center {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.9rem;
  color: #F4F0E8;
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.nav-link:hover,
.nav-link:visited {
  color: #F4F0E8;
  text-decoration: none;
}

.nav-link:hover {
  opacity: 1;
}

.nav-link.active {
  opacity: 1;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.social-icon {
  color: #F4F0E8;
  opacity: 0.5;
  transition: opacity 0.2s ease;
  display: inline-flex;
  align-items: center;
}

.social-icon:hover {
  opacity: 1;
  text-decoration: none;
}

.theme-toggle {
  background: none;
  border: none;
  color: #F4F0E8;
  cursor: pointer;
  padding: 0.25rem;
  opacity: 0.5;
  transition: opacity 0.2s ease;
  display: inline-flex;
  align-items: center;
}

.theme-toggle:hover {
  opacity: 1;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

/* Show sun icon in dark mode (click to go light) */
[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}
[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* Show moon icon in light mode (click to go dark) */
[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}
[data-theme="light"] .theme-toggle .icon-sun {
  display: none;
}

/* When no explicit theme is set, follow OS preference */
.theme-toggle .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}


/* --------------------------------------------------------------------------
   7. Post Cards (homepage list)
   -------------------------------------------------------------------------- */
.post-card {
  display: flex;
  gap: 20px;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.post-card:first-child {
  padding-top: 0;
}

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

.post-card-date {
  width: 60px;
  min-width: 60px;
  text-align: right;
  padding-top: 0.25rem;
}

.post-card-month {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.3;
}

.post-card-year {
  display: block;
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
  line-height: 1.3;
}

.post-card-content {
  flex: 1;
  min-width: 0;
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 6px;
}

.post-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.3;
  margin: 0;
}

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

.post-card-title a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.post-card-title a:visited {
  color: var(--color-text);
}

.post-card-date-inline {
  display: none;
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
  margin-top: 0.25rem;
}

.post-card-excerpt {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-top: 0.4rem;
  margin-bottom: 0;
}

.post-card-image {
  width: 140px;
  min-width: 140px;
  align-self: center;
}

.post-card-image a {
  display: block;
}

.post-card-image a:hover {
  text-decoration: none;
}

.post-card-image img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  border-radius: 6px;
}

/* --------------------------------------------------------------------------
   8. Article Content (prose, blockquotes, code, tables, images)
   -------------------------------------------------------------------------- */
.article-featured-image {
  margin-bottom: 2rem;
}

.article-featured-image img {
  width: 100%;
  border-radius: 6px;
}

.article-header {
  margin-bottom: 2rem;
}

.article-header h1 {
  margin-bottom: 0.5rem;
}

.article-header time {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

/* Code blocks */
.article-content pre {
  background: var(--color-code-bg);
  border-radius: 6px;
  padding: 20px 22px;
  margin: 2rem 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article-content pre code {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #E0D8C8;
  background: none;
  padding: 0;
  border-radius: 0;
}

/* Inline code */
.article-content code {
  font-family: var(--font-code);
  font-size: 0.875rem;
  background: var(--color-inline-code-bg);
  color: var(--color-inline-code-fg);
  padding: 2px 6px;
  border-radius: 3px;
}

/* Blockquotes */
.article-content blockquote {
  border-left: 3px solid var(--color-border);
  padding: 0 0 0 1.25rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

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

/* Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.article-content thead {
  display: table-header-group;
}

.article-content tbody {
  display: table-row-group;
}

.article-content tr {
  display: table-row;
}

.article-content th,
.article-content td {
  display: table-cell;
}

.article-content th {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  text-align: left;
  padding: 8px 12px;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.article-content td {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
}

/* Images */
.article-content img {
  max-width: 100%;
  border-radius: 6px;
  margin: 2rem 0;
}

.article-content figure {
  margin: 2rem 0;
}

.article-content figure img {
  margin: 0;
}

.article-content figcaption {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
  text-align: center;
  margin-top: 0.5rem;
}

/* Links within articles */
.article-content a:active {
  filter: brightness(0.9);
}

/* Lists */
.article-content ul,
.article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.35rem;
}

/* Horizontal rules */
.article-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

/* --------------------------------------------------------------------------
   9. Tag Pills
   -------------------------------------------------------------------------- */
.tag-pill {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 3px;
  background: var(--color-tag-bg);
  color: var(--color-tag-fg);
}

/* --------------------------------------------------------------------------
   10. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.25rem;
}

.footer-top-left {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.footer-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
}

.footer-role {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.78rem;
  opacity: 0.5;
}

.footer-top-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-top-right .social-icon {
  color: var(--color-footer-text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1rem;
}

.footer-copyright,
.footer-credit {
  font-family: var(--font-heading);
  font-size: 0.68rem;
  opacity: 0.35;
}

/* --------------------------------------------------------------------------
   11. 404 Page
   -------------------------------------------------------------------------- */
.page-404 {
  text-align: center;
  padding: 4rem 1.5rem;
}

.page-404 h1 {
  margin-bottom: 1rem;
}

.page-404 p {
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   12. Accessibility
   -------------------------------------------------------------------------- */
a:focus,
button:focus,
.nav-link:focus,
.social-icon:focus {
  outline: 2px solid var(--color-warm-accent);
  outline-offset: 2px;
}

.skip-to-content {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--color-warm-accent);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
}

.skip-to-content:focus {
  left: 0;
}

/* --------------------------------------------------------------------------
   13. Transitions
   -------------------------------------------------------------------------- */
a {
  transition: color 0.2s ease;
}

.tag-pill {
  transition: opacity 0.2s ease;
}

.tag-pill:hover {
  opacity: 0.8;
}

/* --------------------------------------------------------------------------
   14. Responsive (<768px)
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
  /* Font sizes */
  body {
    font-size: 1rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  /* Layout spacing */
  .content-wrap {
    padding: 0 1.25rem;
  }

  .site-nav {
    padding: 1rem 1.25rem;
  }

  .footer-inner {
    padding: 2rem 1.25rem;
  }

  /* Hide social icons on mobile */
  .nav-right .social-icon {
    display: none;
  }

  /* Post cards: hide date column, show inline date */
  .post-card-date {
    display: none;
  }

  .post-card-date-inline {
    display: block;
  }

  /* Post card image: smaller on mobile */
  .post-card-image {
    width: 100px;
    min-width: 100px;
  }

  .post-card-image img {
    height: 70px;
  }

}