/* ==========================================================
   redtogreen.dev — shared styles
   Concept: a git diff. Red is the old way, green is the new.
   ========================================================== */

:root {
  --paper:      #F6F7F4;
  --panel:      #EDF0EA;
  --ink:        #16211D;
  --ink-soft:   #5C6B65;
  --rule:       #D9DED4;
  --red:        #8C2F39;
  --red-tint:   #F7E8E8;
  --green:      #1F6B4A;
  --green-tint: #E3EFE7;

  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;

  --wide: 1080px;
  --read: 660px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.65;
  font-optical-sizing: auto;
}

::selection { background: var(--green-tint); }

a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--green); }

:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.shell { max-width: var(--wide); margin: 0 auto; padding: 0 28px; }
.reading { max-width: var(--read); }

/* ---------- masthead ---------- */

.masthead {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  padding: 30px 0 26px;
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  font-family: var(--mono);
  font-size: 15px; font-weight: 600; letter-spacing: .02em;
  text-decoration: none;
}
.wordmark .r { color: var(--red); }
.wordmark .g { color: var(--green); }
.wordmark .arr { color: var(--ink-soft); padding: 0 2px; }

.nav { display: flex; gap: 22px; font-family: var(--mono); font-size: 13.5px; }
.nav a { color: var(--ink-soft); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--green); }

/* ---------- hero ---------- */

.hero { padding: 74px 0 8px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px; letter-spacing: .13em; text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 26px;
}

h1.display {
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(2.15rem, 6.2vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: -.03em;
  margin: 0 0 26px;
}
h1.display .to { color: var(--ink-soft); font-weight: 400; }
h1.display em { font-style: normal; color: var(--green); }

.standfirst {
  font-size: 1.24rem;
  color: var(--ink-soft);
  max-width: 34em;
  margin: 0 0 40px;
}

/* ---------- signature: the diff ---------- */

.diff {
  border: 1px solid var(--rule);
  background: #fff;
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.75;
  margin: 0 0 40px;
  overflow: hidden;
}

.diff-bar {
  display: flex; justify-content: space-between; gap: 16px;
  padding: 9px 16px;
  border-bottom: 1px solid var(--rule);
  background: var(--panel);
  font-size: 12.5px;
  color: var(--ink-soft);
  letter-spacing: .04em;
}

.diff-body { padding: 0; }

.diff-line {
  display: flex; gap: 12px;
  padding: 4px 16px;
  white-space: pre-wrap;
}
.diff-line:first-child { padding-top: 12px; }
.diff-line:last-child { padding-bottom: 12px; }
.diff-line .sign { width: .8em; flex: none; font-weight: 600; }

.diff-line.del { background: var(--red-tint); color: #5E2129; }
.diff-line.del .sign { color: var(--red); }
.diff-line.add { background: var(--green-tint); color: #17402D; }
.diff-line.add .sign { color: var(--green); }

.diff-gap { height: 12px; }

@media (prefers-reduced-motion: no-preference) {
  .diff-line { animation: slide .42s cubic-bezier(.22,.7,.3,1) both; }
  @keyframes slide { from { opacity: 0; transform: translateX(-7px); } }
}

/* ---------- buttons ---------- */

.actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

.btn {
  display: inline-block;
  font-family: var(--mono); font-size: 14px; font-weight: 500;
  padding: 13px 22px;
  text-decoration: none;
  border: 1px solid var(--green);
  background: var(--green); color: var(--paper);
}
.btn:hover { background: #185338; color: var(--paper); }

.btn-quiet {
  background: transparent; color: var(--ink); border-color: var(--rule);
}
.btn-quiet:hover { background: #fff; color: var(--ink); border-color: var(--ink-soft); }

/* ---------- byline strip ---------- */

.whostrip {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 26px 0;
  margin: 56px 0 0;
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}
.fact .k {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-soft);
  display: block; margin-bottom: 5px;
}
.fact .v { font-size: 1.02rem; }

/* ---------- generic sections ---------- */

.band { padding: 66px 0; }
.band + .band { border-top: 1px solid var(--rule); }

h2.sec {
  font-family: var(--mono); font-weight: 500;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  letter-spacing: -.02em;
  margin: 0 0 8px;
}
.sec-note { color: var(--ink-soft); margin: 0 0 34px; max-width: 40em; }

h3.sub {
  font-family: var(--mono); font-weight: 500; font-size: 1.06rem;
  letter-spacing: -.01em;
  margin: 38px 0 10px;
}

/* ---------- cards ---------- */

.cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  border: 1px solid var(--rule);
  background: #fff;
  padding: 24px;
  display: flex; flex-direction: column; gap: 9px;
}
.card .tag {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--green);
}
.card h4 { font-family: var(--mono); font-weight: 500; font-size: 1.05rem; margin: 0; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--ink-soft); font-size: 1rem; }
.card .go { margin-top: auto; padding-top: 12px; font-family: var(--mono); font-size: 13px; color: var(--green); text-decoration: none; }
.card .go:hover { text-decoration: underline; }

/* ---------- prose ---------- */

.prose h2 {
  font-family: var(--mono); font-weight: 500;
  font-size: 1.5rem; letter-spacing: -.02em;
  margin: 60px 0 4px;
  padding-top: 26px;
  border-top: 1px solid var(--rule);
}
.prose h3 { font-family: var(--mono); font-weight: 500; font-size: 1.1rem; margin: 34px 0 8px; }
.prose p { margin: 0 0 20px; }
.prose ul, .prose ol { margin: 0 0 22px; padding-left: 24px; }
.prose li { margin-bottom: 9px; }
.prose strong { font-weight: 600; }
.prose code {
  font-family: var(--mono); font-size: .84em;
  background: var(--panel); padding: 2px 5px;
}
.prose pre {
  font-family: var(--mono); font-size: 14px; line-height: 1.6;
  background: #fff; border: 1px solid var(--rule);
  padding: 18px; overflow-x: auto; margin: 0 0 24px;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }
.prose blockquote {
  margin: 0 0 24px; padding: 4px 0 4px 20px;
  border-left: 2px solid var(--green);
  color: var(--ink-soft);
}
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 44px 0; }

.lede { font-size: 1.2rem; color: var(--ink-soft); }

/* ---------- callouts ---------- */

.milestone {
  border: 1px solid var(--green);
  background: var(--green-tint);
  padding: 18px 20px;
  margin: 0 0 26px;
}
.milestone .k {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--green);
  display: block; margin-bottom: 6px;
}
.milestone p { margin: 0; color: var(--ink); }

.skip {
  border-left: 2px solid var(--red);
  background: var(--red-tint);
  padding: 14px 18px;
  margin: 0 0 26px;
}
.skip .k {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--red);
  display: block; margin-bottom: 5px;
}
.skip p { margin: 0; }

/* ---------- checklist ---------- */

.checks { list-style: none; padding: 0; margin: 0 0 26px; }
.checks li {
  display: flex; gap: 12px; align-items: baseline;
  padding: 10px 0; border-bottom: 1px solid var(--rule);
}
.checks li::before {
  content: "✓"; color: var(--green);
  font-family: var(--mono); font-weight: 600; flex: none;
}

/* ---------- article list ---------- */

.entries { list-style: none; padding: 0; margin: 0; }
.entries li { padding: 26px 0; border-bottom: 1px solid var(--rule); }
.entries .meta {
  font-family: var(--mono); font-size: 12px; letter-spacing: .09em;
  text-transform: uppercase; color: var(--ink-soft);
  display: block; margin-bottom: 8px;
}
.entries h3 { font-family: var(--mono); font-weight: 500; font-size: 1.18rem; margin: 0 0 7px; letter-spacing: -.015em; }
.entries h3 a { text-decoration: none; }
.entries h3 a:hover { text-decoration: underline; }
.entries p { margin: 0; color: var(--ink-soft); font-size: 1.02rem; }
.entries li.soon h3 { color: var(--ink-soft); }

/* ---------- article header ---------- */

.artmeta {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .09em;
  text-transform: uppercase; color: var(--ink-soft);
  margin: 60px 0 14px;
}
h1.arttitle {
  font-family: var(--mono); font-weight: 500;
  font-size: clamp(1.75rem, 4.4vw, 2.5rem);
  line-height: 1.14; letter-spacing: -.025em;
  margin: 0 0 20px;
}

/* ---------- footer ---------- */

.foot {
  border-top: 1px solid var(--rule);
  margin-top: 80px;
  padding: 34px 0 60px;
  font-family: var(--mono); font-size: 13px;
  color: var(--ink-soft);
  display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap;
}
.foot a { color: var(--ink-soft); }
.foot a:hover { color: var(--green); }

@media (max-width: 620px) {
  body { font-size: 18px; }
  .hero { padding-top: 48px; }
  .diff { font-size: 13px; }
  .band { padding: 48px 0; }
}