/* ==========================================================================
   Notes from an Email Marketer — shared stylesheet
   One file, plain CSS, no framework. Edit variables below to retheme.
   ========================================================================== */

:root {
  --ink: #111111;
  --paper: #fdfdfb;
  --paper-dim: #f4f2ee;
  --line: #e3e0d9;
  --muted: #6b6b66;
  --orange: #ff5a1f;
  --orange-dark: #d6470f;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;

  --max: 720px;
  --max-wide: 960px;
}

* { 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: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.wrap-wide {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Type ---- */

h1, h2, h3 {
  font-family: var(--sans);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
h3 { font-size: 1.3rem; }

p { margin: 0 0 1.2em; }

.eyebrow {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange-dark);
  margin: 0 0 1em;
}

.lede {
  font-family: var(--sans);
  font-size: 1.3rem;
  color: var(--muted);
  max-width: 42ch;
}

.muted { color: var(--muted); }

/* ---- Header / nav ---- */

.site-header {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.site-header .wrap-wide {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.brand {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.site-nav {
  font-family: var(--sans);
  font-size: 0.95rem;
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.site-nav a { text-decoration: none; color: var(--muted); }
.site-nav a:hover { color: var(--ink); }

/* ---- Buttons ---- */

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  padding: 14px 26px;
  border-radius: 3px;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: transparent;
}

.btn:hover { color: var(--paper); background: var(--ink); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--orange-dark);
  border-color: var(--orange-dark);
  color: var(--paper);
}

.btn-orange {
  background: var(--orange);
  border-color: var(--orange);
  color: #1a0800;
}

.btn-orange:hover {
  background: var(--orange-dark);
  border-color: var(--orange-dark);
  color: #fff;
}

.btn-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 1.6em 0;
}

.text-link {
  font-family: var(--sans);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---- Hero ---- */

.hero {
  padding: 88px 0 64px;
}

.hero .lede { margin: 0.6em 0 1.4em; }

.hero-copy p {
  font-family: var(--serif);
  font-size: 1.15rem;
  max-width: 52ch;
}

/* ---- Sections ---- */

.section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}

.section-tight { padding: 48px 0; }

.section-dim {
  background: var(--paper-dim);
}

.section-dark {
  background: var(--ink);
  color: var(--paper);
}

.section-dark h2, .section-dark .eyebrow { color: var(--paper); }
.section-dark .eyebrow { color: var(--orange); }
.section-dark a { color: var(--paper); }
.section-dark p { color: #d8d6d0; }

/* ---- Contents list ---- */

.contents-list {
  list-style: none;
  margin: 2em 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.contents-list li {
  border-bottom: 1px solid var(--line);
}

.contents-list a {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 4px;
  text-decoration: none;
  font-family: var(--sans);
  font-size: 1.05rem;
}

.contents-list a:hover { color: var(--orange-dark); }

.contents-list .num {
  font-weight: 800;
  color: var(--muted);
  min-width: 3.2em;
  font-variant-numeric: tabular-nums;
}

.contents-list a:hover .num { color: var(--orange-dark); }

/* ---- Notebook / offer section ---- */

.offer {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 760px) {
  .offer { grid-template-columns: 1.1fr 1fr; gap: 56px; }
}

.offer img {
  border-radius: 4px;
}

/* ---- About ---- */

.about-links {
  font-family: var(--sans);
  display: flex;
  gap: 20px;
  margin-top: 1em;
}

/* ---- Forms ---- */

form {
  font-family: var(--sans);
  max-width: 480px;
}

.field {
  margin-bottom: 18px;
}

label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 1rem;
  padding: 12px 14px;
  border: 1px solid #c9c6bd;
  border-radius: 3px;
  background: #fff;
  color: var(--ink);
}

textarea { resize: vertical; }

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.checkbox-field input { margin-top: 4px; }

.form-note {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 6px;
}

.placeholder-note {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--orange-dark);
  background: #fff3ec;
  border: 1px dashed var(--orange);
  padding: 10px 14px;
  border-radius: 3px;
  margin-bottom: 24px;
}

/* ---- Note page ---- */

.note-header {
  padding: 56px 0 24px;
}

.note-nav {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.note-nav .wrap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--sans);
  font-size: 0.85rem;
}

.note-nav a { text-decoration: none; color: var(--muted); }
.note-nav a:hover { color: var(--ink); }

.note-body figure {
  margin: 2.4em 0;
}

.note-body figcaption {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 10px;
}

.note-body .full-bleed {
  width: 100%;
}

.note-question {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.3rem;
  margin: 1.4em 0 0.4em;
}

.note-footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 32px 0;
  margin-top: 40px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
}

.note-footer-nav a { text-decoration: none; font-weight: 700; }
.note-footer-nav .dir { display: block; font-size: 0.75rem; color: var(--muted); font-weight: 400; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 4px; }

.note-cta {
  margin-top: 40px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper-dim);
  text-align: center;
}

.note-cta p { margin-bottom: 1em; font-family: var(--sans); }

/* ---- Diagram placeholder ---- */

.diagram {
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 40px 20px;
  background: var(--paper-dim);
}

.diagram svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.diagram figcaption { text-align: center; }

/* ---- Footer ---- */

.site-footer {
  padding: 48px 0 64px;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer .wrap-wide {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links a { text-decoration: none; color: var(--muted); }
.footer-links a:hover { color: var(--ink); }

/* ---- Utility ---- */

.center { text-align: center; }
.mt-0 { margin-top: 0; }