/* 10×Newsletter — typographic, minimal, baoyu.io-inspired */

:root {
  --bg: oklch(0.985 0.005 90);
  --ink: oklch(0.22 0.01 60);
  --ink-soft: oklch(0.45 0.01 60);
  --ink-mute: oklch(0.6 0.01 60);
  --rule: oklch(0.9 0.005 80);
  --rule-soft: oklch(0.94 0.005 80);
  --accent: oklch(0.42 0.11 150);
  --accent-soft: oklch(0.42 0.11 150 / 0.08);
  --accent-on: #fff;
  --max: 860px;
  --max-wide: 1080px;
  --gap: clamp(20px, 4vw, 36px);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", "Inter Fallback", system-ui, -apple-system, "SF Pro Text",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-feature-settings: "ss01", "cv11", "calt";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.65;
}
body { min-height: 100vh; }
a { color: inherit; text-decoration: none; }

/* ─── App shell ─────────────────────────────────── */
.nl-app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ─── Header ─────────────────────────────────────── */
.nl-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-wide);
  margin: 0 auto;
  width: 100%;
  padding: 22px var(--gap) 18px;
}
.nl-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.nl-logo-mark {
  font-weight: 700;
  font-feature-settings: "ss01", "tnum";
  letter-spacing: -0.04em;
}
.nl-logo-word { color: var(--ink-soft); font-weight: 500; }
.nl-logo:hover .nl-logo-word { color: var(--ink); }

.nl-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nl-nav-link {
  padding: 8px 12px;
  font-size: 14px;
  color: var(--ink-soft);
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}
.nl-nav-link:hover { color: var(--ink); }
.nl-nav-link.is-active { color: var(--ink); }
.nl-nav-cta {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid var(--rule);
  border-radius: 999px;
  transition: all 0.15s;
  margin-left: 4px;
}
.nl-nav-cta:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ─── Main ───────────────────────────────────────── */
.nl-main {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px var(--gap) 76px;
}
.nl-main-narrow { max-width: 620px; }
.nl-home-main { max-width: 900px; }
.nl-archive-main { max-width: 900px; }
.nl-issue-main { max-width: 780px; }

.nl-rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 40px 0;
}

/* ─── Hero ───────────────────────────────────────── */
.nl-hero { padding: 8px 0 4px; }
.nl-hero-eyebrow {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 12px;
}
.nl-hero-title {
  font-size: clamp(38px, 5.4vw, 56px);
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.028em;
  margin: 0 0 16px;
  color: var(--ink);
  text-wrap: balance;
}
.nl-hero-sub {
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0;
  max-width: 62ch;
  text-wrap: pretty;
}
.nl-hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 18px;
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
}
.nl-hero-links a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}


/* ─── Issue masthead ─────────────────────────────── */
.nl-issue-banner {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.nl-issue-banner::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--accent);
}
.nl-issue-masthead { margin-bottom: 24px; }
.nl-issue-theme {
  font-size: clamp(24px, 3.4vw, 30px);
  line-height: 1.18;
  font-weight: 600;
  letter-spacing: -0.022em;
  color: var(--ink);
  margin: 0 0 10px;
  text-wrap: balance;
}
.nl-issue-meta {
  font-size: 13px;
  color: var(--ink-mute);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-feature-settings: "tnum";
  letter-spacing: -0.005em;
  margin-bottom: 8px;
}
.nl-issue-num { color: var(--ink); font-weight: 500; }
.nl-issue-sep { color: var(--ink-mute); }
.nl-issue-note {
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 10px 0 0;
  text-wrap: pretty;
  max-width: 56ch;
}

/* ─── Article ────────────────────────────────────── */
.nl-issue-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.nl-issue-body-home {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 36px;
}
.nl-article {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 22px;
  border-top: 1px solid var(--rule-soft);
}
.nl-article:first-child { border-top: 0; padding-top: 0; }
.nl-issue-body-home .nl-article,
.nl-issue-body-home .nl-article:first-child {
  border-top: 1px solid var(--rule-soft);
  padding-top: 18px;
}
.nl-article-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nl-article-title {
  font-size: 21px;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: -0.018em;
  margin: 2px 0 0;
  text-wrap: balance;
}
.nl-article-title a {
  color: var(--ink);
  background-image: linear-gradient(var(--ink), var(--ink));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 0.2s;
}
.nl-article-title a:hover { background-size: 100% 1px; }
.nl-article-ext {
  display: inline-block;
  margin-left: 6px;
  font-size: 0.7em;
  color: var(--ink-mute);
  vertical-align: 0.15em;
  font-weight: 400;
  transition: color 0.15s;
}
.nl-article-title a:hover .nl-article-ext { color: var(--accent); }
.nl-article-meta {
  font-size: 13px;
  color: var(--ink-mute);
  display: flex;
  gap: 8px;
  align-items: baseline;
}
.nl-article-note {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 6px 0 0;
  text-wrap: pretty;
}

/* ─── Closer (end of issue body) ──────────────────── */
.nl-issue-closer {
  margin-top: 16px;
  padding-top: 28px;
  border-top: 1px solid var(--rule-soft);
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
  font-style: italic;
}

/* ─── Past issues (homepage list) ────────────────── */
.nl-section-title {
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 600;
  margin: 0 0 22px;
}
.nl-past-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.nl-past-item { border-top: 1px solid var(--rule-soft); }
.nl-past-item:first-child { border-top: 0; }
.nl-past-link {
  display: block;
  padding: 16px 0;
  transition: opacity 0.15s;
}
.nl-past-link:hover { opacity: 0.75; }
.nl-past-meta {
  font-size: 12.5px;
  color: var(--ink-mute);
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 4px;
  font-feature-settings: "tnum";
}
.nl-past-num { color: var(--ink); font-weight: 500; }
.nl-past-theme {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.018em;
  color: var(--ink);
  line-height: 1.3;
  margin: 4px 0 4px;
}
.nl-past-note {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
  text-wrap: pretty;
  max-width: 56ch;
}
.nl-past-titles {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 15px;
  color: var(--ink);
  line-height: 1.45;
}
.nl-past-title-item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
}
.nl-past-bullet {
  color: var(--ink-mute);
  font-size: 12px;
  font-feature-settings: "tnum";
}
.nl-past-count { color: var(--ink-mute); }
.nl-more {
  display: inline-block;
  margin-top: 28px;
  font-size: 14px;
  color: var(--accent);
  font-weight: 500;
}
.nl-more:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ─── CTA blocks ─────────────────────────────────── */
.nl-cta {
  text-align: center;
  padding: 16px 0 8px;
}
.nl-cta-tight { padding: 0; }
.nl-cta-title {
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
  text-wrap: balance;
}
.nl-cta-sub {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0 0 22px;
  text-wrap: pretty;
}

/* ─── Issue detail page ──────────────────────────── */
.nl-back {
  display: inline-block;
  font-size: 13px;
  color: var(--ink-mute);
  margin-bottom: 28px;
  transition: color 0.15s;
}
.nl-back:hover { color: var(--ink); }

.nl-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.nl-pager-side { display: flex; }
.nl-pager-right { justify-content: flex-end; text-align: right; }
.nl-pager-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 0;
  transition: color 0.15s;
}
.nl-pager-link:hover { color: var(--accent); }
.nl-pager-dir {
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}
.nl-pager-title {
  font-size: 14px;
  color: var(--ink);
  font-weight: 500;
}

/* ─── Archive page ───────────────────────────────── */
.nl-page-head { margin-bottom: 26px; }
.nl-page-title {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 600;
  letter-spacing: -0.025em;
  margin: 0 0 8px;
}
.nl-page-sub {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0;
  font-feature-settings: "tnum";
}

.nl-filter {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--rule);
}
.nl-filter-search {
  appearance: none;
  border: 1px solid var(--rule);
  background: oklch(1 0 0);
  font: inherit;
  font-size: 14px;
  padding: 9px 12px;
  border-radius: 8px;
  outline: none;
  width: 100%;
  max-width: 360px;
  color: var(--ink);
  transition: border 0.15s, box-shadow 0.15s;
}
.nl-filter-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.nl-archive {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.nl-archive-row {
  border-top: 1px solid var(--rule-soft);
}
.nl-archive-row:first-child { border-top: 0; }
.nl-archive-link {
  display: block;
  padding: 24px 0;
  transition: opacity 0.15s;
}
.nl-archive-link:hover { opacity: 0.78; }
.nl-archive-meta {
  font-size: 12.5px;
  color: var(--ink-mute);
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 10px;
  font-feature-settings: "tnum";
}
.nl-archive-num { color: var(--ink); font-weight: 500; }
.nl-archive-theme {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.018em;
  color: var(--ink);
  line-height: 1.3;
  margin: 0 0 14px;
}
.nl-archive-titles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.nl-archive-article {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
}
.nl-archive-index {
  color: var(--ink-mute);
  font-size: 12px;
  letter-spacing: 0.06em;
  font-feature-settings: "tnum";
}
.nl-archive-article-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.nl-archive-title {
  font-size: 18px;
  color: var(--ink);
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.nl-archive-source {
  font-size: 12.5px;
  color: var(--ink-mute);
  line-height: 1.35;
}
.nl-archive-note {
  max-width: 62ch;
  margin-top: 3px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.nl-empty {
  padding: 24px 0;
  color: var(--ink-mute);
  font-size: 14px;
}

/* ─── About / prose ──────────────────────────────── */
.nl-prose p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 18px;
  text-wrap: pretty;
}
.nl-prose p:last-child { margin-bottom: 0; }
.nl-prose strong { font-weight: 600; }

/* ─── Footer ─────────────────────────────────────── */
.nl-footer {
  border-top: 1px solid var(--rule);
  margin-top: auto;
  background: var(--bg);
}
.nl-footer-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 28px var(--gap) 36px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.nl-footer-line {
  font-size: 13px;
  color: var(--ink-mute);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
}
.nl-footer-line a { color: var(--ink-mute); transition: color 0.15s; }
.nl-footer-line a:hover { color: var(--ink); }
.nl-footer-tag {
  font-size: 12.5px;
  color: var(--ink-mute);
  font-style: italic;
}
.nl-dot { color: var(--ink-mute); }

/* ─── Mobile ─────────────────────────────────────── */
@media (max-width: 540px) {
  .nl-header { padding: 20px var(--gap) 14px; }
  .nl-nav { gap: 2px; }
  .nl-nav-link { padding: 8px 8px; font-size: 13px; }
  .nl-main { padding-top: 10px; }
  .nl-hero-title { font-size: clamp(34px, 12vw, 44px); }
  .nl-issue-body-home { grid-template-columns: 1fr; gap: 22px; }
  .nl-rule { margin: 34px 0; }
  .nl-archive-article {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 10px;
  }
  .nl-pager { grid-template-columns: 1fr; }
  .nl-pager-right { justify-content: flex-start; text-align: left; }
}

/* ─── Article reader ─────────────────────────────── */
.nl-article-index {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  font-feature-settings: "tnum";
  margin-left: 4px;
}
.nl-article-readmore {
  display: inline-block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
}
.nl-article-readmore:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.nl-reader { display: flex; flex-direction: column; }
.nl-reader-head { margin-bottom: 36px; }
.nl-reader-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 12px;
  color: var(--ink-mute);
  font-feature-settings: "tnum";
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.nl-reader-tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent);
}
.nl-reader-title {
  font-size: clamp(30px, 4.5vw, 42px);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin: 0 0 14px;
  text-wrap: balance;
  color: var(--ink);
}
.nl-reader-meta {
  font-size: 13px;
  color: var(--ink-mute);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-feature-settings: "tnum";
}

.nl-reader-label {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 600;
  margin-bottom: 10px;
}

.nl-reader-tldr,
.nl-reader-why {
  margin-bottom: 28px;
}
.nl-reader-tldr p,
.nl-reader-why p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
  margin: 0;
  text-wrap: pretty;
}
.nl-reader-tldr p {
  font-weight: 500;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
}

.nl-reader-keys { margin-bottom: 36px; }
.nl-reader-keys ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.nl-reader-keys li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
}
.nl-reader-keynum {
  color: var(--ink-mute);
  font-feature-settings: "tnum";
  font-size: 13px;
  font-weight: 500;
  padding-top: 2px;
}

.nl-rule-tight { margin: 36px 0; }

.nl-reader-body {
  margin-top: 8px;
}
.nl-reader-body .nl-reader-label {
  margin-bottom: 18px;
}
.nl-reader-h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.018em;
  margin: 32px 0 12px;
  color: var(--ink);
}
.nl-reader-p {
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 18px;
  text-wrap: pretty;
}
.nl-reader-callout {
  margin: 24px 0;
  padding: 18px 22px;
  border-left: 2px solid var(--accent);
  background: oklch(1 0 0);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  font-weight: 500;
  font-style: italic;
  text-wrap: pretty;
  border-radius: 0 6px 6px 0;
}

.nl-reader-source {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--rule-soft);
}
.nl-reader-source-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  color: var(--accent);
  font-weight: 500;
  padding: 6px 0;
}
.nl-reader-source-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.nl-reader-source-arrow { font-size: 14px; }
.nl-reader-source-note {
  font-size: 13px;
  color: var(--ink-mute);
  margin: 4px 0 0;
}

/* ─── Density variants (tweaks) ──────────────────── */
.nl-density-roomy { --gap: clamp(28px, 5vw, 48px); }
.nl-density-roomy .nl-issue-body { gap: 48px; }
.nl-density-roomy .nl-article { padding-top: 36px; }
.nl-density-roomy .nl-rule { margin: 60px 0; }

.nl-density-compact .nl-issue-body { gap: 24px; }
.nl-density-compact .nl-article { padding-top: 20px; }
.nl-density-compact .nl-rule { margin: 34px 0; }
.nl-density-compact .nl-article-note { font-size: 15px; }

/* ─── Mark variants ──────────────────────────────── */
.nl-mark-hide .nl-logo-mark { display: none; }
.nl-mark-hide .nl-logo-word::before { content: "10× "; color: var(--ink); font-weight: 700; letter-spacing: -0.04em; }