/* =============================================
   Learning is Change — site refresh (Decision 014, D-1)
   Layers on top of /portfolio/css/style.css. Adds: dark-mode tokens,
   unified nav tweaks, blog layout (content + right rail), prose styles
   for WordPress-era post bodies, and archive/list components.
   Mockup draft — becomes /css/site.css when P1 ships.
   ============================================= */

/* --- Refreshed tokens (light) --- */
:root {
  --color-bg: #fffdf9;          /* warm paper instead of pure white */
  --color-surface: #f6f3ec;
  --color-border: #e6e1d6;
  --color-ink: #1c1b22;
  --color-text: #2f2e3a;
  --color-muted: #6b6a78;
  --color-light: #9b9aa8;
  --color-accent: #2a9d8f;
  --color-accent-dark: #1e7268;
  --color-accent-light: #e4f3f0;
  --color-warm: #e9c46a;
  --color-warm-light: #fbf3dc;
  --color-coral: #e76f51;
  --color-coral-light: #fdece6;
  --nav-bg: rgba(255, 253, 249, 0.9);
  --rail-width: 300px;
  --measure: 68ch;
  color-scheme: light;
}

/* --- Dark mode (system) --- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #15161c;
    --color-surface: #1d1f27;
    --color-border: #2c2f3a;
    --color-ink: #f2f1ec;
    --color-text: #d9d8d2;
    --color-muted: #a2a1ab;
    --color-light: #6f6e7a;
    --color-accent: #4fc3b3;
    --color-accent-dark: #7fd8cb;
    --color-accent-light: #1b3a37;
    --color-warm: #e9c46a;
    --color-warm-light: #3a3220;
    --color-coral: #f08a6e;
    --color-coral-light: #3d2620;
    --nav-bg: rgba(21, 22, 28, 0.88);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --color-bg: #15161c; --color-surface: #1d1f27; --color-border: #2c2f3a;
  --color-ink: #f2f1ec; --color-text: #d9d8d2; --color-muted: #a2a1ab; --color-light: #6f6e7a;
  --color-accent: #4fc3b3; --color-accent-dark: #7fd8cb; --color-accent-light: #1b3a37;
  --color-warm-light: #3a3220; --color-coral: #f08a6e; --color-coral-light: #3d2620;
  --nav-bg: rgba(21, 22, 28, 0.88); color-scheme: dark;
}

/* portfolio css hard-codes a few whites; re-point them at tokens */
.site-nav { background: var(--nav-bg); }
.card, .app-card, .tile, .post-highlight { background: var(--color-bg); }
.btn-primary, .app-link.primary { color: #fff; }
.nav-brand .brand-mark { color: #fff; }

/* --- Unified nav: one row for blog + portfolio --- */
.nav-links a { padding: var(--space-sm) 0.8rem; }
.nav-links a.nav-cta { color: var(--color-accent-dark); font-weight: 600; }
.nav-brand small { font-family: var(--font-body); font-weight: 500; color: var(--color-muted); font-size: 0.8rem; margin-left: 2px; }

/* --- Blog layout: content + right rail --- */
.blog-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); align-items: start; padding-top: var(--space-2xl); }
@media (min-width: 960px) {
  .blog-layout { grid-template-columns: minmax(0, 1fr) var(--rail-width); gap: var(--space-3xl); }
  .rail { position: sticky; top: calc(var(--nav-height) + var(--space-lg)); }
}
.rail { display: grid; gap: var(--space-md); }
.rail-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 14px; padding: var(--space-lg); }
.rail-card h3 { font-size: 0.78rem; font-family: var(--font-body); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-muted); margin-bottom: var(--space-md); }
.rail-card ul { list-style: none; }
.rail-card li { padding: 6px 0; border-top: 1px solid var(--color-border); font-size: 0.9rem; line-height: 1.4; }
.rail-card li:first-child { border-top: none; padding-top: 0; }
.rail-card li a { color: var(--color-text); }
.rail-card li a:hover { color: var(--color-accent-dark); }
.rail-card li time, .rail-card li .n { display: block; font-size: 0.75rem; color: var(--color-light); font-family: var(--font-mono); }
.rail-me { display: flex; gap: 14px; align-items: center; }
.rail-me img { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.rail-me strong { font-family: var(--font-heading); color: var(--color-ink); display: block; font-size: 1.05rem; }
.rail-me span { font-size: 0.85rem; color: var(--color-muted); line-height: 1.4; display: block; }
.rail-meet { border-left: 4px solid var(--color-accent); }
.rail-meet .rail-me strong { color: var(--color-accent-dark); }
.rail .topics { display: flex; flex-wrap: wrap; gap: 6px; }
.rail .topics a { font-size: 0.78rem; padding: 3px 10px; border-radius: 100px; background: var(--color-bg); border: 1px solid var(--color-border); color: var(--color-text); }
.rail .topics a:hover { border-color: var(--color-accent); color: var(--color-accent-dark); }
.rail .years { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; }
.rail .years a { font-family: var(--font-mono); font-size: 0.78rem; text-align: center; padding: 4px 0; border-radius: 6px; color: var(--color-muted); }
.rail .years a:hover { background: var(--color-accent-light); color: var(--color-accent-dark); }

/* --- Post --- */
.post-header { margin-bottom: var(--space-xl); }
.post-header .kicker { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: var(--space-md); }
.post-header h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); max-width: 22ch; margin-bottom: var(--space-md); }
.post-meta { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 0.88rem; color: var(--color-muted); align-items: center; }
.post-meta time { font-family: var(--font-mono); font-size: 0.82rem; }
.prose { max-width: var(--measure); font-size: 1.08rem; line-height: 1.75; color: var(--color-text); }
.prose > * + * { margin-top: 1.1em; }
.prose p { margin-bottom: 0; }
.prose h2, .prose h3, .prose h4 { margin-top: 1.8em; }
.prose img, .prose iframe, .prose video { max-width: 100%; height: auto; border-radius: 10px; }
.prose figure { margin: 1.6em 0; }
.prose figure img { display: block; margin: 0 auto; max-height: 70vh; width: auto; }
.prose figcaption { text-align: center; font-size: 0.85rem; color: var(--color-muted); margin-top: 8px; }
.prose blockquote { margin: 1.4em 0; }
.prose a { text-decoration: underline; text-decoration-color: var(--color-accent-light); text-underline-offset: 3px; }
.prose a:hover { text-decoration-color: var(--color-accent); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: 0.35em; }
.prose pre { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 10px; padding: var(--space-md); overflow-x: auto; font-family: var(--font-mono); font-size: 0.85rem; }
.prose code { font-family: var(--font-mono); font-size: 0.9em; background: var(--color-surface); padding: 1px 5px; border-radius: 4px; }
.prose .wp-block-embed, .prose .jetpack-video-wrapper { position: relative; }
.prose .wp-block-embed iframe { width: 100%; aspect-ratio: 16 / 9; height: auto; }
.prose .alignleft { float: left; margin: 0.3em 1.2em 0.6em 0; }
.prose .alignright { float: right; margin: 0.3em 0 0.6em 1.2em; }
.prose .aligncenter { display: block; margin: 1em auto; }
.prose .wp-caption { max-width: 100%; }
.prose .wp-caption-text { font-size: 0.85rem; color: var(--color-muted); text-align: center; }

.post-footer { max-width: var(--measure); margin-top: var(--space-2xl); padding-top: var(--space-lg); border-top: 1px solid var(--color-border); }
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); margin-top: var(--space-xl); }
.post-nav a { display: block; padding: var(--space-md); border: 1px solid var(--color-border); border-radius: 12px; color: var(--color-text); background: var(--color-bg); transition: all 0.2s ease; }
.post-nav a:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.post-nav a small { display: block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-light); margin-bottom: 4px; }
.post-nav a.next { text-align: right; }
.post-nav a strong { font-family: var(--font-heading); font-weight: 600; color: var(--color-ink); }
@media (max-width: 520px) { .post-nav { grid-template-columns: 1fr; } .post-nav a.next { text-align: left; } }
.related { margin-top: var(--space-2xl); }
.related h2 { font-size: 1.1rem; margin-bottom: var(--space-md); }

/* --- Post lists (home, archives) --- */
.post-list { list-style: none; display: grid; gap: 2px; }
.post-list li { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: var(--space-md); padding: 14px 0; border-top: 1px solid var(--color-border); align-items: baseline; }
.post-list li:first-child { border-top: none; }
.post-list time { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-light); white-space: nowrap; }
.post-list .t { font-family: var(--font-heading); font-size: 1.15rem; font-weight: 600; color: var(--color-ink); }
.post-list .t:hover { color: var(--color-accent-dark); }
.post-list .d { display: block; font-size: 0.92rem; color: var(--color-muted); margin-top: 2px; line-height: 1.5; }
.post-list .k { display: inline-flex; gap: 6px; margin-top: 6px; }
.post-list .k a { font-size: 0.72rem; color: var(--color-accent-dark); background: var(--color-accent-light); padding: 1px 8px; border-radius: 100px; }
.post-list .thumb { float: right; width: 72px; height: 72px; object-fit: cover; border-radius: 8px; margin: 0 0 6px 14px; border: 1px solid var(--color-border); }
@media (max-width: 600px) { .post-list li { grid-template-columns: 1fr; gap: 2px; } }

/* --- Home --- */
.home-hero { padding: var(--space-3xl) 0 var(--space-xl); }
.home-hero h1 { font-size: clamp(1.9rem, 5vw, 3rem); max-width: 18ch; }
.home-hero .lead { margin-top: var(--space-md); }
.home-stats { display: flex; gap: var(--space-lg); flex-wrap: wrap; margin-top: var(--space-lg); font-size: 0.85rem; color: var(--color-muted); }
.home-stats b { font-family: var(--font-mono); color: var(--color-ink); font-weight: 500; }
.search-box { display: flex; gap: 8px; max-width: 480px; margin-top: var(--space-lg); }
.search-box input { flex: 1; padding: 11px 14px; border: 1px solid var(--color-border); border-radius: 10px; background: var(--color-bg); color: var(--color-text); font: inherit; font-size: 0.95rem; }
.search-box input:focus { outline: 2px solid var(--color-accent); outline-offset: 1px; border-color: transparent; }
.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-md); margin-bottom: var(--space-md); }
.section-title h2 { font-size: 1.25rem; }
.section-title a { font-size: 0.85rem; font-weight: 600; }
.series-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-md); }
.series { padding: var(--space-lg); border: 1px solid var(--color-border); border-radius: 14px; background: var(--color-bg); color: inherit; transition: all 0.2s ease; }
.series:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.series strong { font-family: var(--font-heading); color: var(--color-ink); display: block; font-size: 1.05rem; }
.series span { font-size: 0.85rem; color: var(--color-muted); display: block; margin-top: 4px; }
.series .n { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-accent-dark); margin-top: 8px; display: block; }
.pager { display: flex; justify-content: space-between; margin-top: var(--space-xl); font-size: 0.9rem; font-weight: 600; }
.otd { display: grid; gap: 10px; }
.otd a { display: grid; grid-template-columns: 4rem minmax(0, 1fr); gap: var(--space-md); align-items: baseline; color: var(--color-text); }
.otd a b { font-family: var(--font-mono); font-weight: 500; color: var(--color-accent-dark); }
.otd a:hover { color: var(--color-accent-dark); }

/* --- Footer --- */
.site-footer { background: var(--color-surface); margin-top: var(--space-3xl); }