/* DBHeart redesign — production stylesheet */
:root {
  --bg: oklch(0.985 0.005 85);
  --bg-2: oklch(0.97 0.006 85);
  --bg-3: oklch(0.94 0.008 85);
  --ink: oklch(0.22 0.01 250);
  --ink-2: oklch(0.42 0.01 250);
  --ink-3: oklch(0.58 0.01 250);
  --line: oklch(0.9 0.008 85);
  --line-2: oklch(0.86 0.01 85);
  --accent: oklch(0.55 0.12 200);
  --accent-ink: oklch(0.35 0.14 200);
  --accent-bg: oklch(0.95 0.025 200);
  --radius: 6px;
  --radius-lg: 12px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
code, pre, .mono { font-family: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace; }

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.01em; color: var(--ink); margin: 0; text-wrap: balance; }
h1 { font-size: 40px; line-height: 1.1; letter-spacing: -0.022em; }
h2 { font-size: 22px; line-height: 1.25; }
h3 { font-size: 17px; line-height: 1.3; }
p { margin: 0; text-wrap: pretty; }

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

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 28px;
  display: flex; align-items: center; gap: 28px; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: -0.02em; font-size: 18px; color: var(--ink);
}
.brand-mark {
  width: 26px; height: 26px; border-radius: 6px;
  background: var(--ink); color: var(--bg);
  display: grid; place-items: center; font-weight: 700; font-size: 13px;
  font-family: "IBM Plex Mono", monospace;
}
.brand small {
  display: block; font-size: 11px; color: var(--ink-3); font-weight: 500;
  letter-spacing: 0.04em; text-transform: uppercase;
}
.nav { display: flex; gap: 4px; align-items: center; }
.nav a {
  padding: 8px 12px; border-radius: var(--radius); font-size: 14px;
  color: var(--ink-2); font-weight: 500;
}
.nav a:hover { background: var(--bg-3); color: var(--ink); text-decoration: none; }
.nav a.active { color: var(--ink); background: var(--bg-3); }
.spacer { flex: 1; min-width: 0; }

/* Search input + dropdown */
.search {
  position: relative;
  display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 6px 11px; background: var(--bg);
  width: 280px; color: var(--ink); font-size: 13.5px;
}
.search:focus-within { border-color: var(--ink-3); }
.search-icon { color: var(--ink-3); flex-shrink: 0; }
.search-input {
  border: 0;
  background: transparent;
  font: inherit;
  color: var(--ink);
  outline: none;
  flex: 1;
  min-width: 0;
  padding: 2px 0;
}
.search-input::placeholder { color: var(--ink-3); }
.search-input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
  width: 14px; height: 14px;
  background: var(--ink-3);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path d='M4 4l8 8M12 4l-8 8' stroke='currentColor' stroke-width='2' stroke-linecap='round' fill='none'/></svg>") center/contain no-repeat;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path d='M4 4l8 8M12 4l-8 8' stroke='currentColor' stroke-width='2' stroke-linecap='round' fill='none'/></svg>") center/contain no-repeat;
  cursor: pointer;
}

.search-results {
  position: absolute;
  top: calc(100% + 6px); left: 0; right: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px -10px oklch(0.22 0.01 250 / 0.24);
  max-height: 60vh;
  overflow-y: auto;
  z-index: 60;
  min-width: 360px;
  padding: 4px;
}
.search-results[hidden] { display: none; }
.search-result {
  display: block;
  padding: 10px 12px;
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
}
.search-result:hover, .search-result.active {
  background: var(--bg-3);
  text-decoration: none;
}
.search-result .r-topic {
  font-family: "IBM Plex Mono", monospace; font-size: 10.5px;
  color: var(--accent-ink); letter-spacing: 0.06em;
  text-transform: uppercase; margin-bottom: 2px;
}
.search-result .r-title { font-size: 14px; font-weight: 500; line-height: 1.3; }
.search-result .r-desc {
  color: var(--ink-3); font-size: 12.5px; margin-top: 3px;
  line-height: 1.4;
}
.search-empty {
  padding: 18px 14px; color: var(--ink-3);
  font-size: 13px; text-align: center;
}

@media (max-width: 1000px) {
  .search { width: 220px; }
  .search-results { min-width: 280px; right: auto; left: 0; }
}
@media (max-width: 640px) {
  .search { width: 100%; }
  .search-results { left: 0; right: 0; min-width: 0; }
}

/* Layout helpers */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.row { display: flex; gap: 24px; }
.col { flex: 1; min-width: 0; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 14px; border-radius: var(--radius);
  font-size: 14px; font-weight: 500; cursor: pointer;
  border: 1px solid var(--line-2); background: var(--bg); color: var(--ink);
  text-decoration: none;
}
.btn:hover { background: var(--bg-3); text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-primary:hover { background: var(--ink-2); color: var(--bg); }

/* Cards */
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
}
.card-hover { transition: border-color .15s ease, transform .15s ease; }
.card-hover:hover { border-color: var(--ink-3); }

/* Tags / badges */
.tag {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 8px; border-radius: 999px;
  font-size: 11.5px; font-weight: 500;
  background: var(--bg-3); color: var(--ink-2);
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 0.01em;
}
.tag.accent { background: var(--accent-bg); color: var(--accent-ink); }
.tag.oracle { background: oklch(0.95 0.025 30); color: oklch(0.45 0.15 30); }
.tag.unix { background: oklch(0.95 0.025 280); color: oklch(0.42 0.12 280); }
.tag.cert { background: oklch(0.95 0.025 145); color: oklch(0.42 0.12 145); }

/* Pills */
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  padding: 8px 14px; border: 1px solid var(--line-2); border-radius: 999px;
  font-size: 13px; color: var(--ink-2); background: var(--bg);
  text-decoration: none;
}
.pill:hover { border-color: var(--ink-3); color: var(--ink); text-decoration: none; }
.pill.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* Breadcrumbs */
.crumbs {
  padding: 16px 0 0; font-size: 13px; color: var(--ink-3);
  font-family: "IBM Plex Mono", monospace;
}
.crumbs a { color: var(--ink-2); }
.crumbs .sep { margin: 0 8px; }

/* Footer */
.foot {
  border-top: 1px solid var(--line);
  margin-top: 80px;
  padding: 36px 0 48px;
  color: var(--ink-3); font-size: 13.5px;
}
.foot a { color: var(--ink-2); }
.foot-row { display: flex; gap: 48px; flex-wrap: wrap; }
.foot h4 {
  font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 10px; font-weight: 600;
}
.foot ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }

/* ================================ HOMEPAGE ============================== */
.hero { padding: 72px 0 56px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 56px; align-items: end; }
.eyebrow {
  font-family: "IBM Plex Mono", monospace; font-size: 12px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent-ink); margin-bottom: 18px;
}
.hero h1 { font-size: 56px; letter-spacing: -0.025em; line-height: 1.02; }
.hero h1 em { font-style: normal; color: var(--ink-3); }
.hero .lede { font-size: 19px; color: var(--ink-2); margin-top: 22px; max-width: 56ch; }
.hero-actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.stat-block {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat { background: var(--bg); padding: 18px 20px; }
.stat .n { font-size: 28px; font-weight: 600; letter-spacing: -0.02em; }
.stat .l { font-size: 12.5px; color: var(--ink-3); margin-top: 2px; }

.section { padding: 56px 0; }
.section h2.section-title {
  display: flex; align-items: baseline; gap: 14px;
  border-bottom: 1px solid var(--line); padding-bottom: 14px; margin-bottom: 28px;
}
.section-title .num {
  font-family: "IBM Plex Mono", monospace; font-size: 12px;
  color: var(--ink-3); letter-spacing: 0.06em;
}
.section-title .more {
  margin-left: auto; font-size: 13px; font-weight: 500; color: var(--accent-ink);
}

.topics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.topic { padding: 22px 22px 20px; display: flex; flex-direction: column; gap: 14px; }
.topic-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.topic h3 { font-size: 19px; }
.topic p.sub { color: var(--ink-2); font-size: 14px; margin-top: 2px; }
.topic ul { list-style: none; padding: 0; margin: 0; }
.topic ul li { padding: 9px 0; border-top: 1px solid var(--line); font-size: 14.5px; }
.topic ul li:first-child { border-top: 0; }
.topic ul li a { color: var(--ink); display: flex; justify-content: space-between; gap: 12px; }
.topic ul li a:hover { color: var(--accent-ink); text-decoration: none; }
.topic ul li .reads { color: var(--ink-3); font-size: 12px; font-family: "IBM Plex Mono", monospace; white-space: nowrap; }
.topic .topic-cta { margin-top: auto; font-size: 13px; padding-top: 4px; }

.featured-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 18px; }
.feat { padding: 22px; display: flex; flex-direction: column; gap: 14px; min-height: 240px; text-decoration: none; color: inherit; }
.feat:hover { text-decoration: none; }
.feat .meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.feat h3 { font-size: 21px; letter-spacing: -0.01em; color: var(--ink); }
.feat.lg h3 { font-size: 26px; line-height: 1.15; }
.feat p { color: var(--ink-2); font-size: 14px; }
.feat .read { color: var(--ink-3); font-size: 12px; font-family: "IBM Plex Mono", monospace; margin-top: auto; }

.news {
  margin-top: 32px; padding: 28px 32px; border-radius: var(--radius-lg);
  background: var(--bg-2); border: 1px solid var(--line);
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: center;
}
.news h3 { font-size: 22px; letter-spacing: -0.015em; }
.news p { color: var(--ink-2); font-size: 14px; margin-top: 8px; }
.news form { display: flex; gap: 8px; }
.news input {
  flex: 1; padding: 11px 14px; border-radius: var(--radius);
  border: 1px solid var(--line-2); font: inherit; background: var(--bg);
}

/* ================================ HUB PAGE ============================== */
.hub-head { padding: 18px 0 36px; border-bottom: 1px solid var(--line); }
.hub-head h1 { font-size: 42px; letter-spacing: -0.022em; margin-top: 12px; }
.hub-head .lede { color: var(--ink-2); max-width: 64ch; font-size: 17px; margin-top: 14px; }
.hub-head .quick { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }

.hub-layout {
  display: grid; grid-template-columns: 240px 1fr; gap: 56px;
  padding: 36px 0 0;
}
.side { position: sticky; top: 84px; align-self: start; }
.side h4 {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600; margin: 18px 0 8px;
}
.side h4:first-child { margin-top: 0; }
.side ul { list-style: none; padding: 0; margin: 0; }
.side li a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 5px 8px; border-radius: 4px; font-size: 13.5px;
  color: var(--ink-2); margin: 0 -8px;
}
.side li a:hover { background: var(--bg-3); color: var(--ink); text-decoration: none; }
.side li a.active { background: var(--accent-bg); color: var(--accent-ink); }
.side li a .count { font-family: "IBM Plex Mono", monospace; font-size: 11px; color: var(--ink-3); }

.sec { margin-bottom: 48px; }
.sec-head {
  display: flex; align-items: baseline; gap: 14px;
  padding-bottom: 10px; border-bottom: 1px solid var(--line); margin-bottom: 16px;
}
.sec-head h2 { font-size: 22px; }
.sec-head .count {
  font-family: "IBM Plex Mono", monospace; color: var(--ink-3); font-size: 12px;
}

.arts { display: flex; flex-direction: column; gap: 4px; }
.art {
  display: grid; grid-template-columns: 1fr auto auto; gap: 18px;
  align-items: center; padding: 14px 12px; border-radius: 8px;
  border: 1px solid transparent;
  text-decoration: none; color: inherit;
}
.art:hover { background: var(--bg); border-color: var(--line); text-decoration: none; }
.art h3 { font-size: 16px; font-weight: 500; color: var(--ink); }
.art p { color: var(--ink-2); font-size: 13.5px; margin-top: 3px; }
.art .meta { font-family: "IBM Plex Mono", monospace; font-size: 12px; color: var(--ink-3); white-space: nowrap; }
.art .arrow { color: var(--ink-3); font-size: 18px; }
.art:hover .arrow { color: var(--accent-ink); }

.pick-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin-bottom: 36px; }
.pick { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--bg); }
.pick .label {
  font-family: "IBM Plex Mono", monospace; font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-ink);
}
.pick h3 { font-size: 17px; margin-top: 8px; line-height: 1.25; }
.pick h3 a { color: var(--ink); }
.pick p { color: var(--ink-2); font-size: 13.5px; margin-top: 8px; }

/* ================================ ARTICLE PAGE ========================== */
.art-head { padding: 14px 0 28px; }
.art-head .tags { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.art-head h1 {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-weight: 600; font-size: 46px; line-height: 1.1; letter-spacing: -0.018em;
  max-width: 24ch;
}
.art-head .standfirst {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: 20px; line-height: 1.45; color: var(--ink-2);
  max-width: 60ch; margin-top: 18px;
}
.byline {
  margin-top: 24px; display: flex; align-items: center; gap: 14px;
  padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  font-size: 13px; color: var(--ink-2); flex-wrap: wrap;
}
.av {
  width: 36px; height: 36px; border-radius: 999px;
  background: var(--ink); color: var(--bg);
  display: grid; place-items: center; font-weight: 600; font-family: "IBM Plex Mono", monospace; font-size: 12px;
}
.byline .b-meta { display: flex; flex-direction: column; gap: 1px; }
.byline .b-name { color: var(--ink); font-weight: 500; }
.byline .b-info { color: var(--ink-3); font-size: 12px; font-family: "IBM Plex Mono", monospace; }

.art-layout {
  display: grid; grid-template-columns: 1fr min(740px, 100%) 1fr; gap: 36px;
  padding: 28px 0 0;
}
.art-layout > .body { grid-column: 2; }
.art-layout > .toc { grid-column: 1; }
.art-layout > .rail { grid-column: 3; }

.toc { position: sticky; top: 84px; align-self: start; padding-right: 8px; }
.toc h4 {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600; margin: 0 0 12px;
}
.toc ol { list-style: none; padding: 0; margin: 0; border-left: 1px solid var(--line); }
.toc ol li a {
  display: block; padding: 5px 12px; font-size: 13px;
  color: var(--ink-2); border-left: 2px solid transparent; margin-left: -1px;
}
.toc ol li a.active, .toc ol li a:hover {
  color: var(--accent-ink); border-left-color: var(--accent); font-weight: 500;
  text-decoration: none;
}

/* Imported article body — applies inside .body */
article.body {
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: 18px; line-height: 1.7; color: var(--ink);
  max-width: 70ch;
}
article.body > * + * { margin-top: 16px; }
article.body h2, article.body h3, article.body h4 {
  font-family: "IBM Plex Sans", sans-serif;
  letter-spacing: -0.01em;
}
article.body h2 { font-size: 24px; margin: 44px 0 4px; }
article.body h3 { font-size: 18px; margin: 32px 0 4px; }
article.body h4 { font-size: 16px; margin: 24px 0 0; padding-left: 0; }
article.body p { margin: 0; }
article.body a { color: var(--accent-ink); }
article.body a:hover { text-decoration: underline; }
article.body strong, article.body b { font-weight: 600; color: var(--ink); }
article.body em, article.body i { font-style: italic; color: var(--ink-2); }
article.body ul, article.body ol { padding-left: 22px; margin: 12px 0; }
article.body li { margin: 6px 0; }
article.body img {
  display: block; margin: 24px auto; border-radius: 6px;
  border: 1px solid var(--line); max-width: 100%; height: auto;
}
article.body code {
  font-family: "IBM Plex Mono", monospace; font-size: 0.88em;
  background: var(--bg-3); padding: 1px 6px; border-radius: 4px;
}
article.body pre {
  font-family: "IBM Plex Mono", monospace; font-size: 13px;
  background: oklch(0.18 0.01 250); color: oklch(0.92 0.005 85);
  padding: 18px 20px; border-radius: 10px; overflow-x: auto;
  margin: 22px 0; line-height: 1.5;
}
article.body pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; }
article.body table {
  border-collapse: collapse; width: 100%; margin: 18px 0;
  font-family: "IBM Plex Sans", sans-serif; font-size: 14px;
}
article.body th, article.body td {
  border: 1px solid var(--line); padding: 8px 12px; text-align: left;
}
article.body th { background: var(--bg-2); }

/* ============================ COPY PROTECTION =========================== */
/* Block selection on prose, but keep code blocks fully selectable          */
article.body,
.hub-head, .topic, .feat, .pick, .art,
.art-head h1, .art-head .standfirst {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
article.body pre,
article.body code,
article.body pre *,
article.body code * {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
  cursor: text;
}
/* Friendly attribution block at the foot of each article */
.attrib {
  margin-top: 40px;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-bg);
  border-radius: 6px;
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 13.5px; line-height: 1.55;
  color: var(--accent-ink);
  -webkit-user-select: text; user-select: text;
}
.attrib strong { color: var(--accent-ink); }
.attrib a { color: var(--accent-ink); text-decoration: underline; }

/* Code-block copy button */
.code-wrap {
  position: relative;
  margin: 22px 0;
}
.code-wrap pre {
  margin: 0 !important;
}
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: oklch(0.78 0.005 85);
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.02em;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s ease, background 0.15s ease, color 0.15s ease;
  -webkit-user-select: none;
  user-select: none;
  z-index: 2;
}
.code-wrap:hover .copy-btn,
.code-wrap:focus-within .copy-btn,
.copy-btn:hover { opacity: 1; }
.copy-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: oklch(0.95 0.005 85);
}
.copy-btn.copied {
  background: oklch(0.55 0.13 145);
  border-color: oklch(0.55 0.13 145);
  color: white;
  opacity: 1;
}

/* ============================ ABOUT POPOVER ============================ */
.topbar-inner { position: relative; }
.about-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 6px 10px 6px 6px; background: var(--bg);
  color: var(--ink); font-size: 13.5px; font-weight: 500;
  cursor: pointer; font-family: inherit;
  white-space: nowrap;
}
.about-toggle:hover { background: var(--bg-3); }
.about-toggle .av-mini {
  width: 22px; height: 22px; border-radius: 999px;
  background: var(--ink); color: var(--bg);
  display: grid; place-items: center;
  font-family: "IBM Plex Mono", monospace; font-size: 10px;
  font-weight: 600;
}
.about-toggle .caret { color: var(--ink-3); font-size: 9px; }

.about-pop {
  position: absolute;
  top: calc(100% + 8px);
  right: 28px;
  width: 340px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 32px -10px oklch(0.22 0.01 250 / 0.22);
  padding: 20px;
  z-index: 60;
  display: none;
}
.about-pop.open { display: block; }
.about-pop .pop-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.about-pop .pop-head .av { width: 40px; height: 40px; font-size: 13px; }
.about-pop h4 { font-size: 15px; font-weight: 600; margin: 0; }
.about-pop .role {
  font-family: "IBM Plex Mono", monospace; font-size: 11px;
  color: var(--ink-3); letter-spacing: 0.04em; margin-top: 2px;
}
.about-pop p {
  font-size: 13.5px; color: var(--ink-2); line-height: 1.55;
  margin: 0 0 14px;
}
.about-pop .pop-links {
  display: flex; gap: 16px; font-size: 13px; padding-top: 12px;
  border-top: 1px solid var(--line); align-items: center;
}
.about-pop .pop-links a { color: var(--accent-ink); font-weight: 500; }
.about-pop .pop-links .spacer-mini { flex: 1; }

/* ============================ BACK TO TOP ============================== */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 40;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--bg);
  border: 0;
  border-radius: 999px;
  font-family: "IBM Plex Sans", -apple-system, sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.15s ease;
  box-shadow: 0 6px 18px -4px oklch(0.22 0.01 250 / 0.28);
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover { background: var(--ink-2); }

@media (max-width: 1000px) {
  .about-pop { right: 20px; width: min(340px, calc(100vw - 40px)); }
  .back-to-top { bottom: 20px; right: 20px; }
}

/* Right rail */
.rail { position: sticky; top: 84px; align-self: start; }
.rr-card {
  padding: 16px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg-2); font-size: 13px;
}
.rr-card h4 {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600; margin: 0 0 10px;
}
.rr-card p { color: var(--ink-2); margin-bottom: 12px; line-height: 1.5; }

/* Related cards block */
.related {
  margin-top: 64px; padding: 24px 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.related h4 {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600; margin: 0 0 16px;
}
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.rel-card {
  padding: 16px; border: 1px solid var(--line); border-radius: 10px;
  text-decoration: none; color: inherit; background: var(--bg);
}
.rel-card:hover { border-color: var(--ink-3); text-decoration: none; }
.rel-card .tag { margin-bottom: 8px; }
.rel-card h5 {
  font-family: "IBM Plex Sans", sans-serif; font-size: 15px;
  font-weight: 500; line-height: 1.3; color: var(--ink);
}
.rel-card p {
  font-family: "IBM Plex Sans", sans-serif; font-size: 13px;
  color: var(--ink-2); margin-top: 6px;
}

/* ============================== RESPONSIVE =========================== */
@media (max-width: 1000px) {
  .topbar-inner { gap: 16px; padding: 12px 20px; }
  .search { display: none; }
  .container { padding: 0 20px; }
  .hero { padding: 40px 0 36px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { font-size: 38px; }
  .topics { grid-template-columns: 1fr; }
  .featured-grid { grid-template-columns: 1fr 1fr; }
  .featured-grid .feat.lg { grid-column: 1 / -1; }
  .hub-layout { grid-template-columns: 1fr; gap: 24px; }
  .side { position: static; }
  .pick-row { grid-template-columns: 1fr; }
  .art-layout {
    grid-template-columns: 1fr;
  }
  .art-layout > .body, .art-layout > .toc, .art-layout > .rail { grid-column: 1; }
  .toc, .rail { position: static; }
  .related-grid { grid-template-columns: 1fr; }
  .art-head h1 { font-size: 34px; }
  .news { grid-template-columns: 1fr; gap: 16px; padding: 22px; }
}

@media (max-width: 640px) {
  .nav a { padding: 6px 8px; font-size: 13px; }
  .featured-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .hub-head h1 { font-size: 30px; }
  .stat-block { grid-template-columns: 1fr 1fr; }
}