/* --- CSS Variables & Themes --- */
:root {
  --bg: #ffffff;
  --text: #0f0f0f;
  --muted: #5a5a5a;
  --card: #f6f7f9;
  --border: #e7e7ea;
  --accent: #2f72ff;  /* blue-leaning for RG colorblind friendliness */
  --link: #255dff;
  --pill: #e9efff;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(0,0,0,.06);
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

html[data-theme="dark"] {
  --bg: #0b0d10;
  --text: #f2f4f8;
  --muted: #9aa4b2;
  --card: #131721;
  --border: #1e2633;
  --accent: #7aa2ff;
  --link: #c2ddff;
  --pill: #1b2a52;
  --shadow: 0 6px 24px rgba(0,0,0,.4);
}

/* --- Monochrome system used by Blog + Tools --- */
body.mono {
  --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #f9f9f9;
  --text: #050505;
  --muted: #6a6a6a;
  --card: #f1f1f1;
  --border: #d8d8d8;
  --accent: #050505;
  --link: #050505;
  --pill: #ededed;
  --shadow: 0 30px 80px rgba(0,0,0,.08);
}

html[data-theme="dark"] body.mono {
  --bg: #020202;
  --text: #f4f4f4;
  --muted: #a0a0a0;
  --card: #050505;
  --border: #1b1b1b;
  --accent: #f4f4f4;
  --link: #f4f4f4;
  --pill: #0f0f0f;
  --shadow: 0 50px 120px rgba(0,0,0,.65);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.mono {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 300;
  letter-spacing: 0.01em;
}

a {
  color: var(--link);
  text-decoration-color: color-mix(in oklab, var(--link) 70%, transparent);
}

a:hover,
a:focus {
  text-decoration-color: var(--link);
}

body.mono a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.28em;
  text-decoration-color: color-mix(in srgb, var(--text) 30%, transparent);
}

body.mono a:hover,
body.mono a:focus {
  color: var(--text);
  text-decoration-color: color-mix(in srgb, var(--text) 70%, transparent);
}

/* --- Header --- */
.site-header {
  position: relative;
  backdrop-filter: blur(8px);
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.2px;
  text-decoration: none;
  color: var(--text);
  font-size: 1.1rem;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  opacity: 0.86;
  margin-right: 14px;
}
.nav a[aria-current="page"] { opacity: 1; }

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
}

.theme-toggle.is-sun {
  color: #facc15; /* Tailwind amber-400 — bright yellow */
}

.theme-toggle.is-moon {
  color: inherit; /* whatever the text color is */
}

body.mono .site-header {
  backdrop-filter: none;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  border-bottom: 1px solid var(--border);
  padding: clamp(14px, 3vw, 24px) clamp(14px, 4vw, 40px);
  text-transform: uppercase;
}

body.mono .brand {
  font-size: 0.9rem;
  font-weight: 300;
  letter-spacing: 0.32em;
}

body.mono .nav {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 3vw, 2.6rem);
  flex-wrap: wrap;
  justify-content: flex-end;
}

body.mono .nav a {
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  opacity: 0.68;
  transition: opacity 0.2s ease;
}

body.mono .nav a[aria-current="page"],
body.mono .nav a:hover,
body.mono .nav a:focus-visible {
  opacity: 1;
}

body.mono .theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  line-height: 1;
  padding: 0;
}

body.mono .theme-toggle.is-sun {
  background: #070707;
  border-color: #070707;
  color: #f4f4f4;
}

body.mono .theme-toggle.is-moon {
  background: #fdfdfd;
  border-color: #d2d2d2;
  color: #050505;
}

html[data-theme="dark"] body.mono .theme-toggle {
  border-color: #1a1a1a;
  background: #050505;
}

/* --- Layout --- */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px 18px 48px;
}

.hero { margin: 8px 0 10px; }
.hero h1 { margin: 4px 0 6px; font-size: 1.85rem; }
.sub { color: var(--muted); margin: 0 0 14px; }

body.mono .container {
  max-width: 1120px;
  padding: clamp(32px, 6vw, 96px) clamp(18px, 8vw, 80px) clamp(64px, 10vw, 160px);
}

body.mono .hero {
  margin: 0 0 36px;
}

body.mono .hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 300;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

body.mono .sub {
  color: var(--muted);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  max-width: 56ch;
}

/* --- Tag Filter --- */
.tag-filter { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border);
  background: var(--pill);
  color: var(--text);
  border-radius: 999px;
  font-size: 0.9rem;
  padding: 6px 12px;
  cursor: pointer;
  transition: transform .05s ease-in-out;
}
.chip:hover { transform: translateY(-1px); }
.chip.is-active {
  border-color: var(--accent);
  outline: 2px solid color-mix(in oklab, var(--accent) 35%, transparent);
}

body.mono .tag-filter {
  gap: 0.65rem;
  margin: 24px 0 0;
}

body.mono .chip {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  padding: 8px 18px;
  text-transform: uppercase;
  border-radius: 999px;
  border-color: var(--border);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  transition: opacity 0.2s ease, background 0.2s ease;
}

body.mono .chip:hover {
  transform: none;
  opacity: 0.7;
}

body.mono .chip.is-active {
  outline: none;
  border-color: var(--text);
  background: var(--text);
  color: var(--bg);
}

/* --- Cards --- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
  margin-top: 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .12s ease;
}
.card:hover { transform: translateY(-2px); border-color: color-mix(in oklab, var(--accent) 25%, var(--border)); }

.card-link { display: block; text-decoration: none; color: inherit; padding: 18px; }

.card-title {
  margin: 0 0 6px;
  font-size: 1.15rem;
  line-height: 1.3;
}

.card-excerpt { margin: 0 0 10px; color: var(--muted); }

.meta { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; color: var(--muted); }
.pill {
  display: inline-block;
  background: var(--pill);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 999px;
}

body.mono .grid {
  gap: clamp(1rem, 2.8vw, 2.5rem);
  margin-top: 36px;
}

body.mono .card {
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-radius: 32px;
  border-color: color-mix(in srgb, var(--border) 70%, transparent);
  box-shadow: none;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

body.mono .card:hover {
  transform: translateY(-4px);
  border-color: var(--text);
}

body.mono .card-link {
  padding: clamp(20px, 4vw, 36px);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

body.mono .card-title {
  font-size: 1rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  font-weight: 300;
}

body.mono .card-excerpt {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

body.mono .meta {
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  gap: 0.9rem;
  color: var(--muted);
}

body.mono .pill {
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.72rem;
  padding: 4px 12px;
  background: transparent;
  color: inherit;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
  padding: 18px;
  text-align: center;
}

body.mono .site-footer {
  padding: clamp(32px, 6vw, 72px) clamp(18px, 8vw, 80px);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.28em;
}

/* --- Basic a11y --- */
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
img { max-width: 100%; height: auto; border-radius: 8px; }

body.mono :focus-visible {
  outline-color: var(--text);
}

/* --- Image zoom overlay --- */
img.zoomable-image {
  cursor: zoom-in;
  transition: transform .2s ease, box-shadow .2s ease;
}

img.zoomable-image:hover,
img.zoomable-image:focus-visible {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 10px 28px rgba(0,0,0,.12);
}

.image-zoom-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(16px, 4vw, 48px);
  backdrop-filter: blur(8px);
  z-index: 999;
  overflow-y: auto;
}

.image-zoom-overlay.is-active {
  display: flex;
}

.image-zoom-backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in oklab, var(--bg) 12%, #05070fcc);
  cursor: zoom-out;
}

.image-zoom-content {
  position: relative;
  width: min(92vw, 960px);
  margin: 0 auto clamp(24px, 4vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 1;
}

.image-zoom-image {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 18px 48px rgba(0,0,0,.35);
  background: var(--bg);
}

.image-zoom-magnifier {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 50%;
  border: 2px solid color-mix(in oklab, var(--bg) 65%, #000);
  box-shadow: 0 12px 30px rgba(0,0,0,.35);
  pointer-events: none;
  background-repeat: no-repeat;
  background-color: rgba(10, 12, 20, 0.85);
  display: none;
  overflow: hidden;
}

.image-zoom-magnifier.is-visible {
  display: block;
}

.image-zoom-caption {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

.image-zoom-close {
  position: absolute;
  top: 12px;
  right: 12px;
  border: none;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 1.4rem;
  line-height: 1;
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  color: inherit;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,.18);
}

.image-zoom-close:hover,
.image-zoom-close:focus-visible {
  background: color-mix(in oklab, var(--bg) 95%, transparent);
}

body.image-zoom-locked {
  overflow: hidden;
}

@media (max-width: 640px) {
  .image-zoom-content {
    max-width: 100vw;
  }

  .image-zoom-caption {
    font-size: 0.9rem;
  }
}

/* --- Post layout & typography --- */
.post { max-width: 820px; margin: 0 auto; }
.post-header h1 { margin-top: 8px; margin-bottom: 6px; line-height: 1.2; }
.post .meta { color: var(--muted); margin-bottom: 18px; display: flex; gap: 10px; align-items: center; }

/* --- Comments --- */
.post-comments {
  margin-top: clamp(32px, 6vw, 72px);
  padding: clamp(20px, 4vw, 30px);
  background: color-mix(in srgb, var(--card) 85%, var(--bg));
  border-radius: 24px;
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  box-shadow: 0 18px 48px rgba(0,0,0,.04);
}

.post-comments h2 {
  margin: 0;
  font-size: clamp(1.1rem, 2.1vw, 1.4rem);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 300;
}

.comments-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding-bottom: 0.75rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
}

.comments-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.comments-meta label {
  font-weight: 600;
}

#comments-count {
  font-weight: 600;
  color: var(--text);
}

.post-comments select,
.post-comments button,
.post-comments textarea {
  font: inherit;
}

#comments-sort {
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.comment-auth {
  margin-top: 1rem;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px dashed color-mix(in srgb, var(--border) 80%, transparent);
  background: color-mix(in srgb, var(--bg) 85%, var(--card));
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.comment-auth #user-info {
  display: none;
  gap: 8px;
  align-items: center;
  color: var(--muted);
}

.comment-auth .user-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.comment-auth #user-name {
  font-weight: 600;
  color: var(--text);
}

#sign-in-btn,
.comment-form button[type="submit"] {
  border-radius: 999px;
  padding-inline: 18px;
  padding-block: 9px;
  background: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  color: #fff;
  box-shadow: 0 12px 32px rgba(0,0,0,.18);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}

html:not([data-theme="dark"]) #sign-in-btn {
  color: #fff;
}

html[data-theme="dark"] #sign-in-btn {
  color: #000;
}

#sign-in-btn:hover,
#sign-in-btn:focus-visible,
.comment-form button[type="submit"]:hover,
.comment-form button[type="submit"]:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(0,0,0,.22);
}

.post-comments button.secondary {
  border-radius: 999px;
  padding-inline: 14px;
  padding-block: 7px;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
  font-size: 0.85rem;
}

#comment-form {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  display: none;
  flex-direction: column;
  gap: 0.75rem;
}

#comment-input {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--border);
  padding: 12px 14px;
  background: var(--bg);
  box-shadow: inset 0 2px 8px rgba(0,0,0,.03);
  resize: vertical;
  min-height: 110px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  font-size: 0.95rem;
}

#comment-input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--text) 25%, var(--border));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent);
}

.comment-form-actions {
  display: flex;
  justify-content: flex-end;
}

.replying-indicator {
  display: none;
  margin-top: 0.9rem;
  padding: 8px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--pill) 90%, transparent);
  border: 1px dashed var(--border);
  font-size: 0.85rem;
  color: var(--text);
  align-items: center;
  gap: 0.6rem;
}

/* Preserve flex layout when inline style toggles display */
#replying-indicator[style*="block"] { display: flex !important; }

.replying-indicator strong { font-weight: 700; }

#comments-list { margin-top: 1.25rem; }

.comment {
  border: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
  background: var(--bg);
  border-radius: 18px;
  padding: 12px 14px 10px;
  box-shadow: none;
  margin-bottom: 0.75rem;
}

.comment-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted);
  gap: 0.5rem;
}

.comment-meta strong { color: var(--text); }
.comment-text { margin: 0.4rem 0 0.3rem; white-space: pre-wrap; font-size: 0.95rem; }

.owner-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: #f97316;
  color: #0f0a05;
  font-size: 0.75rem;
  font-weight: 700;
}

.comment-actions {
  margin-top: 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--muted);
}

.comment-actions button,
.toggle-replies-btn {
  padding: 5px 10px;
  font-size: 0.8rem;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  border: none;
  box-shadow: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.comment-actions button:hover,
.comment-actions button:focus-visible,
.toggle-replies-btn:hover,
.toggle-replies-btn:focus-visible {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  color: var(--text);
}

.like-btn {
  padding-inline: 10px;
}

.like-btn span:first-child {
  font-size: 0.9rem;
}

.like-btn.liked {
  background: color-mix(in srgb, var(--accent) 16%, var(--bg));
  color: var(--accent);
}

.like-count {
  font-size: 0.78rem;
  color: var(--muted);
}

.comment-replies {
  margin-top: 0.5rem;
  padding-left: 0.9rem;
  border-left: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

/* --- Breadcrumbs --- */
.breadcrumbs { font-size: 0.95rem; color: var(--muted); margin-bottom: 8px; }
.breadcrumbs a { color: inherit; text-decoration: none; border-bottom: 1px dashed var(--border); }

/* --- TOC --- */
.toc { border: 1px solid var(--border); background: var(--card); padding: 14px; border-radius: var(--radius); margin: 18px 0; }
.toc h2 { margin: 0 0 8px; font-size: 1.05rem; }
.toc ol { margin: 0; padding-left: 18px; }
.toc li { margin: 4px 0; }
.toc li.toc-sub { margin-left: 12px; list-style: circle; }

/* --- Tables --- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 10px 0 18px; }
thead th { text-align: left; border-bottom: 2px solid var(--border); padding: 8px; }
tbody td { border-bottom: 1px solid var(--border); padding: 8px; vertical-align: top; }

/* --- Figures --- */
figure { margin: 18px 0; }
figcaption { color: var(--muted); font-size: 0.95rem; margin-top: 6px; }

body.mono .post {
  max-width: 860px;
}

body.mono .post-header h1 {
  font-weight: 300;
  letter-spacing: 0.08em;
  margin-top: 12px;
}

body.mono .post .meta {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  gap: 0.9rem;
  color: var(--muted);
}

body.mono .breadcrumbs {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.68rem;
  margin-bottom: 20px;
}

body.mono .breadcrumbs a {
  border-bottom: 1px solid color-mix(in srgb, var(--text) 25%, transparent);
  padding-bottom: 2px;
}

body.mono .toc {
  border-radius: 28px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  padding: 24px;
}

body.mono .toc h2 {
  font-size: 0.85rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

body.mono .toc ol {
  padding-left: 1.2rem;
}

body.mono table {
  border: 1px solid var(--border);
}

body.mono thead th,
body.mono tbody td {
  border-color: color-mix(in srgb, var(--border) 75%, transparent);
}

body.mono figure {
  margin: 36px 0;
}

body.mono figcaption {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.74rem;
}