/* ============================================================
   defsite — minimal blog stylesheet
   ============================================================ */

/* ---- Custom properties ------------------------------------ */
:root {
  --color-text:       #1a1a1a;
  --color-muted:      #6b7280;
  --color-link:       #2563eb;
  --color-link-hover: #1d4ed8;
  --color-border:     #e5e7eb;
  --color-bg:         #ffffff;
  --color-bg-alt:     #f9fafb;
  --color-tag-bg:     #eff6ff;
  --color-tag-text:   #1d4ed8;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro",
               Menlo, Consolas, monospace;

  --max-width:     1100px;
  --sidebar-width: 280px;
  --radius:        6px;
}

/* ---- Dark mode -------------------------------------------- */
[data-theme="dark"] {
  --color-text:       #f1f5f9;
  --color-muted:      #94a3b8;
  --color-link:       #60a5fa;
  --color-link-hover: #93c5fd;
  --color-border:     #334155;
  --color-bg:         #0f172a;
  --color-bg-alt:     #1e293b;
  --color-tag-bg:     #1e3a5f;
  --color-tag-text:   #93c5fd;
}

/* System preference fallback (no JS or no stored preference) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --color-text:       #f1f5f9;
    --color-muted:      #94a3b8;
    --color-link:       #60a5fa;
    --color-link-hover: #93c5fd;
    --color-border:     #334155;
    --color-bg:         #0f172a;
    --color-bg-alt:     #1e293b;
    --color-tag-bg:     #1e3a5f;
    --color-tag-text:   #93c5fd;
  }
}

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

/* ---- Base ------------------------------------------------- */
body {
  font-family:      var(--font-sans);
  color:            var(--color-text);
  background-color: var(--color-bg);
  line-height:      1.65;
  font-size:        1rem;
}

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

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

/* ---- Site header ----------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 0 2rem;
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-nav {
  max-width:   var(--max-width);
  margin:      0 auto;
  display:     flex;
  align-items: center;
  gap:         2rem;
  height:      56px;
}

.site-title {
  font-size:   1.1rem;
  font-weight: 700;
  color:       var(--color-text);
  white-space: nowrap;
}
.site-title:hover { text-decoration: none; color: var(--color-link); }

.nav-links {
  list-style: none;
  display:    flex;
  gap:        1.5rem;
}
.nav-links a { color: var(--color-muted); font-size: 0.95rem; }
.nav-links a:hover { color: var(--color-text); text-decoration: none; }

/* ---- Body layout ----------------------------------------- */
.site-body {
  max-width:  var(--max-width);
  margin:     2.5rem auto;
  padding:    0 2rem;
  display:    grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap:        3rem;
  align-items: start;
}

/* ---- Sidebar --------------------------------------------- */
.sidebar { position: sticky; top: 72px; }

.author-card {
  text-align:    center;
  padding:       1.5rem;
  border:        1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.author-photo {
  width:         80px;
  height:        80px;
  border-radius: 50%;
  object-fit:    cover;
  margin:        0 auto 0.75rem;
  background:    var(--color-bg-alt);
}

.author-name { font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem; }
.author-bio  { font-size: 0.85rem; color: var(--color-muted); line-height: 1.5; }

.sidebar-search {
  padding:       1.25rem;
  border:        1px solid var(--color-border);
  border-radius: var(--radius);
}

.sidebar-search h4 {
  margin-bottom:   0.75rem;
  font-size:       0.8rem;
  text-transform:  uppercase;
  letter-spacing:  0.08em;
  color:           var(--color-muted);
}

#search-input {
  width:         100%;
  padding:       0.5rem 0.75rem;
  border:        1px solid var(--color-border);
  border-radius: var(--radius);
  font-size:     0.9rem;
  font-family:   var(--font-sans);
  color:         var(--color-text);
  background:    var(--color-bg);
  outline:       none;
  transition:    border-color 0.15s;
}
#search-input:focus { border-color: var(--color-link); }

#search-results { margin-top: 0.75rem; font-size: 0.875rem; }

.search-result-item {
  padding:       0.45rem 0;
  border-bottom: 1px solid var(--color-border);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item a { display: block; font-weight: 500; line-height: 1.3; }
.result-date  { display: block; color: var(--color-muted); font-size: 0.78rem; margin-top: 0.1rem; }
.search-empty { color: var(--color-muted); font-size: 0.85rem; margin-top: 0.25rem; }

/* ---- Category filter ------------------------------------- */
.index-controls { margin-bottom: 1.75rem; }

.category-filters {
  display:   flex;
  flex-wrap: wrap;
  gap:       0.4rem;
}

.filter-btn {
  padding:       0.35rem 0.9rem;
  border:        1px solid var(--color-border);
  border-radius: 9999px;
  background:    var(--color-bg);
  cursor:        pointer;
  font-size:     0.83rem;
  font-family:   var(--font-sans);
  color:         var(--color-muted);
  transition:    all 0.15s;
  line-height:   1.4;
}
.filter-btn:hover {
  border-color: var(--color-link);
  color:        var(--color-link);
}
.filter-btn.active {
  background:   var(--color-link);
  color:        #fff;
  border-color: var(--color-link);
}

/* ---- Post list ------------------------------------------- */
.post-list { display: flex; flex-direction: column; }

.post-card {
  padding:       1.5rem 0;
  border-bottom: 1px solid var(--color-border);
  transition:    opacity 0.15s;
}
.post-card:first-child { padding-top: 0; }
.post-card:last-child  { border-bottom: none; }

.post-card-title { font-size: 1.2rem; margin-bottom: 0.3rem; line-height: 1.35; }
.post-card-title a { color: var(--color-text); }
.post-card-title a:hover { color: var(--color-link); text-decoration: none; }

.post-card-meta {
  display:     flex;
  align-items: center;
  flex-wrap:   wrap;
  gap:         0.75rem;
  margin-bottom: 0.5rem;
  font-size:   0.83rem;
  color:       var(--color-muted);
}

.post-card-summary { color: var(--color-muted); font-size: 0.95rem; }

/* ---- Draft badge ----------------------------------------- */
.draft-badge {
  display:        inline-block;
  padding:        0.1rem 0.45rem;
  background:     #fef3c7;
  color:          #92400e;
  border-radius:  4px;
  font-size:      0.72rem;
  font-weight:    600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  vertical-align: middle;
  margin-left:    0.4rem;
}

[data-theme="dark"] .draft-badge {
  background: #3d2600;
  color:      #fcd34d;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) .draft-badge {
    background: #3d2600;
    color:      #fcd34d;
  }
}

/* ---- Category tags --------------------------------------- */
.category-tag {
  display:       inline-block;
  padding:       0.1rem 0.5rem;
  background:    var(--color-tag-bg);
  color:         var(--color-tag-text);
  border-radius: 4px;
  font-size:     0.78rem;
  font-weight:   500;
  margin-right:  0.2rem;
  white-space:   nowrap;
}
.category-tag:hover { text-decoration: none; opacity: 0.8; }

/* ---- Post page ------------------------------------------- */
.post { max-width: 740px; }

.post-header  { margin-bottom: 2.25rem; }
.post-title   { font-size: 2rem; line-height: 1.25; margin-bottom: 0.75rem; }

.post-meta {
  display:     flex;
  align-items: center;
  flex-wrap:   wrap;
  gap:         0.75rem;
  color:       var(--color-muted);
  font-size:   0.9rem;
}

.post-body { font-size: 1.05rem; line-height: 1.8; }

.post-body h2,
.post-body h3,
.post-body h4 {
  margin:      2rem 0 0.6rem;
  line-height: 1.3;
  font-weight: 600;
}

.post-body p           { margin-bottom: 1.25rem; }
.post-body ul,
.post-body ol          { margin: 0 0 1.25rem 1.5rem; }
.post-body li          { margin-bottom: 0.3rem; }

.post-body pre {
  background:    var(--color-bg-alt);
  border:        1px solid var(--color-border);
  border-radius: var(--radius);
  padding:       1rem 1.25rem;
  overflow-x:    auto;
  margin-bottom: 1.25rem;
  font-family:   var(--font-mono);
  font-size:     0.88rem;
  line-height:   1.6;
}

.post-body code {
  font-family:   var(--font-mono);
  font-size:     0.875em;
  background:    var(--color-bg-alt);
  padding:       0.15em 0.4em;
  border-radius: 3px;
  border:        1px solid var(--color-border);
}
.post-body pre code {
  background: none;
  padding:    0;
  border:     none;
  font-size:  inherit;
}

.post-body blockquote {
  border-left:   3px solid var(--color-border);
  padding:       0.5rem 0 0.5rem 1.25rem;
  color:         var(--color-muted);
  margin-bottom: 1.25rem;
  font-style:    italic;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

.post-footer {
  margin-top:  3rem;
  padding-top: 1.5rem;
  border-top:  1px solid var(--color-border);
  font-size:   0.9rem;
}

/* ---- Categories index ------------------------------------ */
.categories-header h1 { font-size: 1.75rem; margin-bottom: 1.5rem; }

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

.category-item {
  display:       flex;
  align-items:   baseline;
  gap:           0.5rem;
  padding:       0.9rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size:     1.05rem;
}
.category-item:last-child { border-bottom: none; }
.category-item .post-count { color: var(--color-muted); font-size: 0.875rem; }

/* ---- Category page --------------------------------------- */
.category-header { margin-bottom: 2rem; }

.category-header h1 {
  font-size:     1.75rem;
  margin-bottom: 0.35rem;
  text-transform: capitalize;
}

.category-header .post-count { color: var(--color-muted); font-size: 0.95rem; }

.back-link {
  display:    inline-block;
  margin-top: 0.5rem;
  font-size:  0.9rem;
}

/* ---- Site footer ----------------------------------------- */
.site-footer {
  border-top:  1px solid var(--color-border);
  text-align:  center;
  padding:     2rem;
  color:       var(--color-muted);
  font-size:   0.875rem;
  margin-top:  3rem;
}

/* ---- Theme toggle ---------------------------------------- */
#theme-toggle {
  margin-left:   auto;
  padding:       0.3rem 0.75rem;
  border:        1px solid var(--color-border);
  border-radius: var(--radius);
  background:    var(--color-bg);
  color:         var(--color-muted);
  cursor:        pointer;
  font-size:     0.83rem;
  font-family:   var(--font-sans);
  transition:    border-color 0.15s, color 0.15s;
  white-space:   nowrap;
}
#theme-toggle:hover {
  border-color: var(--color-link);
  color:        var(--color-link);
}

/* ---- Utility --------------------------------------------- */
.hidden { display: none !important; }

/* ---- Responsive ------------------------------------------ */
@media (max-width: 800px) {
  .site-body {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .sidebar {
    position: static;
    order: -1;
  }

  .author-card {
    display:   flex;
    text-align: left;
    gap:       1rem;
    padding:   1rem;
  }
  .author-photo { margin: 0; flex-shrink: 0; }

  .post-title  { font-size: 1.5rem; }

  .site-header { padding: 0 1rem; }
  .site-body   { padding: 0 1rem; }
}