/* ============================================================
   rs-tokens.css — writerishi.com shared design system
   Single source of truth for all case studies and blog posts.
   Link this file in every page. Do not duplicate these rules.
   ============================================================ */

/* ── GOOGLE FONTS ── */
@import url('https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@400;600&family=Roboto:wght@400;500&family=Roboto+Mono:wght@400;500&display=swap');

/* ── TOKENS ── */
:root {
  /* Colors */
  --text:        #202124;
  --text-2:      #3c4043;
  --text-3:      #5f6368;
  --text-4:      #9aa0a6;
  --punch:       #1a73e8;
  --punch-soft:  #e8f0fe;
  --punch-dark:  #1557b0;
  --border:      #dadce0;
  --border-soft: #e8eaed;
  --off:         #f8f9fa;
  --off-2:       #f1f3f4;
  --white:       #ffffff;

  /* Semantic status */
  --green:       #137333;
  --green-soft:  #e6f4ea;
  --red:         #c5221f;
  --red-soft:    #fce8e6;
  --amber:       #b06000;
  --amber-soft:  #fef7e0;

  /* Typography */
  --serif: 'Roboto Slab', Georgia, serif;
  --sans:  'Roboto', system-ui, sans-serif;
  --mono:  'Roboto Mono', 'Courier New', monospace;

  /* Scale */
  --text-xs:   .75rem;   /* 12px — labels, meta */
  --text-sm:   .875rem;  /* 14px — supporting */
  --text-base: 1rem;     /* 16px — body */
  --text-lg:   1.125rem; /* 18px */
  --text-xl:   1.25rem;  /* 20px — h2 */
  --text-2xl:  1.5rem;   /* 24px */
  --text-3xl:  2rem;     /* 32px — h1 */

  /* Line heights */
  --lh-tight:   1.2;   /* headings */
  --lh-snug:    1.5;   /* compact body */
  --lh-base:    1.7;   /* reading body */
  --lh-relaxed: 1.8;   /* long form prose */

  /* Spacing */
  --space-xs:  .25rem;
  --space-sm:  .5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --r-sm:   4px;   /* tags, badges */
  --r-md:   8px;   /* cards, blocks */
  --r-pill: 20px;  /* CTAs, pills */

  /* Layout */
  --content-width: 760px;
  --nav-height:    58px;
}

/* ── RESET ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── BASE ── */
html { scroll-behavior: smooth; }

body {
  padding-top: var(--nav-height);
  font-family: var(--sans);
  font-size: var(--text-base);
  line-height: var(--lh-base);
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

/* ── TYPOGRAPHY ── */
h1 {
  font-family: var(--serif);
  font-size: var(--text-3xl);
  font-weight: 600;
  line-height: var(--lh-tight);
  color: var(--text);
  margin-bottom: .4rem;
}

h2 {
  font-family: var(--serif);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: var(--lh-tight);
  color: var(--text);
  margin: 1.75rem 0 .75rem;
}

h3 {
  font-family: var(--serif);
  font-size: var(--text-lg);
  font-weight: 500;
  line-height: var(--lh-tight);
  color: var(--text);
  margin: 1.5rem 0 .6rem;
}

p {
  margin-bottom: var(--space-md);
  color: var(--text-2);
  line-height: var(--lh-base);
}

p:last-child { margin-bottom: 0; }

ul, ol {
  margin: .4rem 0 var(--space-md) 1.1rem;
  color: var(--text-2);
}

li { margin-bottom: .45rem; }

a {
  color: var(--punch);
  text-decoration: none;
}

a:hover { color: var(--punch-dark); }

strong {
  font-weight: 500;
  color: var(--text);
}

code {
  font-family: var(--mono);
  font-size: .85em;
  background: var(--off-2);
  padding: .1rem .4rem;
  border-radius: var(--r-sm);
  color: var(--punch-dark);
}

/* ── NAV (shared across all pages) ── */
.cs-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  padding: 0 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--sans);
}

.cs-nav-back {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: color .15s;
}

.cs-nav-back::before {
  content: '← ';
  font-size: .85rem;
  color: var(--text-4);
}

.cs-nav-back:hover { color: var(--punch); }

.cs-nav-crumb {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--text-4);
  letter-spacing: .05em;
}

.cs-nav-crumb span { color: var(--punch); }

/* ── MAIN CONTENT WRAPPER ── */
main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* ── CASE STUDY HERO ── */
.cs-hero {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.cs-hero .meta {
  color: var(--text-3);
  font-size: var(--text-sm);
  margin-bottom: 1.5rem;
  margin-top: .35rem;
}

/* ── TAG / CHIP ── */
.tag {
  display: inline-block;
  background: var(--off);
  border: 1px solid var(--border);
  padding: .3rem .65rem;
  border-radius: var(--r-sm);
  font-size: var(--text-sm);
  color: var(--text-3);
  margin-bottom: 1rem;
  font-family: var(--sans);
}

.tag.tag-blue {
  background: var(--punch-soft);
  color: var(--punch-dark);
  border-color: transparent;
}

/* ── BEFORE / AFTER BLOCK ── */
.ba-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

.ba-card {
  border-radius: var(--r-md);
  padding: 1rem 1.25rem;
}

.ba-card.before {
  background: var(--red-soft);
  border: 1px solid #f5c6c5;
}

.ba-card.after {
  background: var(--green-soft);
  border: 1px solid #b7dfbf;
}

.ba-label {
  font-size: .7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: .65rem;
  font-family: var(--mono);
}

.ba-card.before .ba-label { color: var(--red); }
.ba-card.after  .ba-label { color: var(--green); }

.ba-card p {
  font-family: var(--mono);
  font-size: .82rem;
  line-height: var(--lh-snug);
  margin: 0;
}

.ba-card.before p { color: var(--red); }
.ba-card.after  p { color: var(--green); }

/* ── CALLOUT ── */
.callout {
  background: var(--punch-soft);
  border-left: 3px solid var(--punch);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.callout-label {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--punch-dark);
  font-weight: 500;
  margin-bottom: .4rem;
}

.callout p {
  font-size: var(--text-sm);
  color: var(--punch-dark);
  margin: 0;
}

/* ── STAT STRIP ── */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  margin: 2rem 0;
}

.stat-cell {
  background: var(--white);
  padding: 1.5rem;
}

.stat-num {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 600;
  color: var(--punch);
  line-height: 1;
  margin-bottom: .4rem;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-3);
  line-height: var(--lh-snug);
}

/* ── QUOTE BLOCK ── */
.quote-block {
  background: var(--off);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.75rem;
  margin: 2rem 0;
  position: relative;
}

.quote-block blockquote {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: var(--lh-base);
  color: var(--text);
  margin-bottom: .75rem;
}

.quote-source {
  font-size: var(--text-sm);
  color: var(--text-3);
}

.quote-source strong {
  color: var(--text-2);
}

/* ── DIVIDER ── */
.cs-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ── FOOTER ── */
.cs-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
}

.cs-footer-name {
  font-family: var(--serif);
  font-size: .95rem;
  color: var(--text);
  font-weight: 500;
}

.cs-footer-links {
  display: flex;
  gap: 1.25rem;
  font-size: var(--text-sm);
}

.cs-footer-links a {
  color: var(--text-3);
  text-decoration: none;
}

.cs-footer-links a:hover { color: var(--punch); }

/* ── BLOG: TL;DR BLOCK ── */
.tldr {
  background: var(--off);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0 2rem;
}

.tldr-label {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-4);
  margin-bottom: .5rem;
  font-weight: 500;
}

.tldr p {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: var(--lh-base);
  margin: 0;
}

/* ── BLOG: AUTHOR STRIP ── */
.author-strip {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.author-name {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.author-role {
  font-size: var(--text-sm);
  color: var(--text-3);
}

.author-links {
  display: flex;
  gap: 1.25rem;
  font-size: var(--text-sm);
  margin-top: .25rem;
}

/* ── BLOG: RELATED POSTS ── */
.related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.related-label {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-4);
  margin-bottom: 1rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.related-card {
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  text-decoration: none;
  transition: border-color .15s;
}

.related-card:hover { border-color: var(--punch); }

.related-card-tag {
  font-size: .75rem;
  color: var(--text-4);
  margin-bottom: .35rem;
}

.related-card-title {
  font-family: var(--serif);
  font-size: .95rem;
  color: var(--text);
  line-height: var(--lh-snug);
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .cs-nav { padding: 0 1.5rem; }
  .cs-nav-crumb { display: none; }
  main { padding: 2rem 1.25rem 3rem; }
  .ba-grid { grid-template-columns: 1fr; }
  .stat-strip { grid-template-columns: 1fr 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .cs-footer { flex-direction: column; }
  h1 { font-size: 1.75rem; }
}

@media (max-width: 480px) {
  .stat-strip { grid-template-columns: 1fr; }
}