/* CoursHub blog: preview styles. Colors and fonts match frontpage/index.html. */
:root {
  --blue: #164EA6;
  --blue-lo: #0D3A83;
  --blue-soft: #6FA0F0;
  --navy: #0B1020;
  --navy-line: #1E2638;
  --ink: #0F172A;
  --text-dim: #5A6478;
  --on-navy: #C3CBDA;
  --on-navy-dim: #A9B3C6;
  --line: #E5E9F2;
  --fog: #F6F8FB;
  --tint: #EEF2FA;
  --do: #14744C;
  --dont: #A52E38;
  --radius: 18px;
  --wrap: 1180px;
  --font-body: Inter, Arial, Helvetica, sans-serif;
  --font-head: Manrope, Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font-body); color: var(--ink); background: #FFFFFF; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); }
a:hover { color: var(--blue-lo); }
img { max-width: 100%; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding-left: 24px; padding-right: 24px; }

.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 16px; background: #FFFFFF; padding: 10px 14px; z-index: 10; }

/* Header */
.site-header { background: #FFFFFF; border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-top: 10px; padding-bottom: 10px; }
.brand img { height: 52px; width: auto; display: block; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 26px; font-size: 15px; font-weight: 500; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--blue); font-weight: 700; border-bottom: 2px solid var(--blue); padding-bottom: 2px; }
.nav .nav-trial { background: var(--blue); color: #FFFFFF; font-weight: 600; padding: 11px 16px; border-radius: 8px; }
.nav .nav-trial:hover { background: var(--blue-lo); color: #FFFFFF; }

/* Buttons */
.btn { display: inline-block; font-weight: 600; font-size: 15px; padding: 13px 20px; border-radius: 8px; text-decoration: none; }
.btn-primary { background: var(--blue); color: #FFFFFF; }
.btn-primary:hover { background: var(--blue-lo); color: #FFFFFF; }
.btn-ghost { background: #FFFFFF; color: var(--blue); border: 1px solid #C9D5EA; }
.btn-light { background: #FFFFFF; color: var(--navy); font-weight: 700; }
.btn-light:hover { color: var(--navy); background: #E8EDF6; }

/* Hero */
.hero { background: var(--navy); color: #FFFFFF; }
.hero .wrap { padding-top: 88px; padding-bottom: 80px; }
.eyebrow { margin: 0 0 16px; font-size: 15px; font-weight: 600; color: var(--blue-soft); }
.hero h1 { margin: 0; font-family: var(--font-head); font-weight: 800; font-size: clamp(40px, 6vw, 64px); line-height: 1.05; letter-spacing: -1.5px; max-width: 860px; }
.hero .lede { margin: 24px 0 0; font-size: 19px; line-height: 1.6; color: var(--on-navy); max-width: 640px; }

/* Sections */
.section { padding-top: 64px; padding-bottom: 72px; }
.section-fog { background: var(--fog); }
.section-title { margin: 0 0 8px; font-family: var(--font-head); font-weight: 800; font-size: 32px; letter-spacing: -0.6px; }
.section-sub { margin: 0 0 28px; font-size: 17px; color: var(--text-dim); }
.kicker { margin: 0 0 16px; font-size: 13px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--text-dim); }

/* Featured post */
.featured { background: #FFFFFF; border: 1px solid var(--line); border-radius: var(--radius); display: flex; flex-wrap: wrap; overflow: hidden; }
.featured-body { flex: 999 1 420px; min-width: 0; padding: 44px; display: flex; flex-direction: column; gap: 16px; }
.featured-art { flex: 1 1 340px; min-width: 0; background: var(--tint); padding: 36px; display: flex; align-items: center; }
.topic { margin: 0; font-size: 14px; font-weight: 600; color: var(--blue); }
.featured h2 { margin: 0; font-family: var(--font-head); font-weight: 800; font-size: clamp(30px, 4vw, 40px); line-height: 1.1; letter-spacing: -0.8px; }
.featured h2 a, .card h3 a { color: var(--ink); text-decoration: none; }
.featured h2 a:hover, .card h3 a:hover { color: var(--blue); }
.featured p.excerpt { margin: 0; font-size: 18px; line-height: 1.6; color: var(--text-dim); }
.meta { margin: 0; font-size: 14px; color: var(--text-dim); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }

.mini-dd { width: 100%; background: #FFFFFF; border-radius: 12px; padding: 18px 20px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; font-size: 14px; line-height: 1.4; }
.mini-dd .h-do { font-weight: 700; color: var(--do); }
.mini-dd .h-dont { font-weight: 700; color: var(--dont); }
.mini-dd .c-do { background: #FFFFFF; border: 2px solid var(--do); border-radius: 8px; padding: 9px; }
.mini-dd .c-dont { background: #FFFFFF; border: 2px solid var(--dont); border-radius: 8px; padding: 9px; }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; gap: 12px; background: #FFFFFF; }
.card h3 { margin: 0; font-family: var(--font-head); font-weight: 700; font-size: 22px; line-height: 1.25; }
.card p.excerpt { margin: 0; font-size: 16px; line-height: 1.55; color: var(--text-dim); flex-grow: 1; }
.card .meta { font-size: 13px; }

.download { background: #FFFFFF; border: 1px solid var(--line); border-radius: 14px; padding: 24px; text-decoration: none; color: var(--ink); display: flex; flex-direction: column; gap: 8px; }
.download:hover { border-color: #C9D5EA; color: var(--ink); }
.download .tag { font-size: 12px; font-weight: 700; letter-spacing: 1px; color: var(--blue); }
.download .name { font-family: var(--font-head); font-weight: 700; font-size: 20px; }
.download .desc { font-size: 15px; line-height: 1.5; color: var(--text-dim); }

/* CTA band */
.cta-band { background: var(--navy); color: #FFFFFF; text-align: center; }
.cta-band .wrap { padding-top: 80px; padding-bottom: 80px; display: flex; flex-direction: column; align-items: center; gap: 18px; }
.cta-band h2 { margin: 0; font-family: var(--font-head); font-weight: 800; font-size: clamp(32px, 4.5vw, 44px); line-height: 1.1; letter-spacing: -1px; }
.cta-band h2 span { color: var(--blue-soft); }
.cta-band p { margin: 0; font-size: 18px; line-height: 1.6; color: var(--on-navy); max-width: 560px; }

/* Footer */
.site-footer { background: var(--navy); border-top: 1px solid var(--navy-line); }
.site-footer .wrap { padding-top: 24px; padding-bottom: 24px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--on-navy-dim); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }
.site-footer a { color: var(--on-navy-dim); text-decoration: none; }
.site-footer a:hover { color: #FFFFFF; }

/* Article */
.post-hero .wrap { padding-top: 56px; padding-bottom: 64px; }
.crumbs { font-size: 14px; color: var(--on-navy-dim); margin-bottom: 28px; }
.crumbs a { color: var(--on-navy-dim); }
.crumbs .here { color: var(--blue-soft); }
.post-hero h1 { font-size: clamp(36px, 5vw, 56px); }
.post-hero .subtitle { margin: 18px 0 0; font-size: 22px; font-weight: 600; color: var(--on-navy); }
.post-hero .meta { margin-top: 28px; font-size: 15px; color: var(--on-navy-dim); }

.post-layout { display: flex; flex-wrap: wrap; gap: 56px; align-items: flex-start; padding-top: 56px; padding-bottom: 24px; }
.post { flex: 999 1 560px; min-width: 0; max-width: 720px; font-size: 19px; line-height: 1.7; }
.post p { margin: 0 0 22px; }
.post p.intro { font-size: 22px; line-height: 1.6; }
.post h2 { margin: 48px 0 14px; font-family: var(--font-head); font-weight: 800; font-size: 30px; line-height: 1.2; letter-spacing: -0.4px; scroll-margin-top: 16px; }
.post ul, .post ol { margin: 0 0 22px; padding-left: 24px; }
.post li { margin-bottom: 8px; }
.post blockquote { margin: 34px 0; padding: 4px 0 4px 28px; border-left: 4px solid var(--blue); font-family: var(--font-head); font-weight: 800; font-size: 30px; line-height: 1.3; color: var(--navy); }
.post .cite { font-size: 14px; color: var(--text-dim); vertical-align: super; line-height: 0; text-decoration: none; }

.dd { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0 0 26px; font-size: 16px; line-height: 1.5; }
.dd > div { padding: 16px 18px; background: #FFFFFF; border-radius: 10px; border: 2px solid; }
.dd .do { border-color: var(--do); }
.dd .dont { border-color: var(--dont); }
.dd .label { display: block; font-weight: 700; font-size: 13px; letter-spacing: 1px; margin-bottom: 6px; }
.dd .do .label { color: var(--do); }
.dd .dont .label { color: var(--dont); }

.callout { background: var(--tint); border-radius: 14px; padding: 22px 24px; margin: 0 0 26px; font-size: 17px; line-height: 1.6; }
.callout strong { display: block; font-family: var(--font-head); font-size: 19px; margin-bottom: 6px; }

.sources { margin-top: 52px; padding-top: 24px; border-top: 1px solid var(--line); }
.sources h2 { margin-top: 0; font-size: 22px; font-weight: 700; }
.sources ol { font-size: 15px; line-height: 1.6; color: var(--text-dim); }

.sidebar { flex: 1 1 280px; min-width: 0; display: flex; flex-direction: column; gap: 24px; }
.side-box { background: var(--tint); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; gap: 12px; }
.side-box .tag { font-size: 12px; font-weight: 700; letter-spacing: 1px; color: var(--blue); }
.side-box .name { font-family: var(--font-head); font-weight: 800; font-size: 22px; line-height: 1.25; }
.side-box .desc { font-size: 15px; line-height: 1.5; color: var(--text-dim); }
.side-box .btn { text-align: center; }
.toc { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.toc p { margin: 0 0 12px; font-size: 13px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--text-dim); }
.toc ol { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 10px; font-size: 15px; line-height: 1.4; }

.post-cta { padding-top: 40px; padding-bottom: 72px; }
.post-cta .box { background: var(--navy); color: #FFFFFF; border-radius: var(--radius); padding: 44px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; }
.post-cta .box > div { flex: 999 1 420px; min-width: 0; }
.post-cta h2 { margin: 0 0 10px; font-family: var(--font-head); font-weight: 800; font-size: 32px; line-height: 1.15; }
.post-cta p { margin: 0; font-size: 17px; line-height: 1.6; color: var(--on-navy); }

@media (max-width: 640px) {
  .hero .wrap { padding-top: 56px; padding-bottom: 56px; }
  .featured-body { padding: 28px; }
  .featured-art { padding: 24px; }
  .post { font-size: 18px; }
  .post p.intro { font-size: 20px; }
  .post blockquote { font-size: 24px; }
  .dd { grid-template-columns: minmax(0, 1fr); }
  .post-cta .box { padding: 28px; }
}

/* Featured art: numbered list or quote */
.mini-list { width: 100%; margin: 0; background: #FFFFFF; border-radius: 12px; padding: 20px 20px 20px 44px; font-size: 15px; line-height: 1.4; display: flex; flex-direction: column; gap: 10px; }
.mini-list li { padding-left: 4px; }
div.mini-list { padding: 24px; }
.mini-quote { margin: 0; font-family: var(--font-head); font-weight: 800; font-size: 24px; line-height: 1.3; color: var(--navy); }