/* ==========================================================================
   The Profit Nook — Bookkeeping Course
   Shared stylesheet
   ========================================================================== */

/* Design tokens
   ------------------------------------------------------------------------ */
:root {
  --color-bg: #FAF8F3;
  --color-ink: #1A1A1A;
  --color-ink-muted: #4A4A4A;
  --color-ink-soft: #6F6F6F;
  --color-accent: #2E5E4E;
  --color-accent-dark: #234838;
  --color-accent-soft: #E7EFEB;
  --color-callout-bg: #F4E8D8;
  --color-callout-border: #C79A5C;
  --color-secondary-bg: #F2F2F2;
  --color-stuck-bg: #ECECEC;
  --color-rule: #E4DFD4;
  --color-rule-soft: #EFEAE0;
  --color-card-bg: #FFFCF5;
  --color-complete: #2E5E4E;
  --color-progress: #C79A5C;
  --color-not-started: #CFC9BC;

  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --measure: 680px;
  --measure-wide: 920px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-soft: 0 1px 2px rgba(26, 26, 26, 0.03), 0 2px 10px rgba(26, 26, 26, 0.04);
}

/* Reset & base
   ------------------------------------------------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-bg);
  font-feature-settings: "kern", "liga", "calt";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Typography
   ------------------------------------------------------------------------ */
h1, h2, h3, h4 {
  color: var(--color-ink);
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 2.4em 0 0.6em;
}

h1, h2 {
  font-family: var(--font-serif);
  font-weight: 500;
}

h3, h4 {
  font-family: var(--font-sans);
  font-weight: 600;
}

h1 {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  letter-spacing: -0.02em;
  margin-top: 0;
}

h2 {
  font-size: 1.65rem;
  font-weight: 500;
}

h3 {
  font-size: 1.2rem;
  letter-spacing: -0.005em;
}

h4 {
  font-size: 1rem;
  margin: 1.6em 0 0.4em;
}

p {
  margin: 0 0 1.1em;
}

ul, ol {
  margin: 0 0 1.3em;
  padding-left: 1.3em;
}

li {
  margin-bottom: 0.5em;
}

li::marker {
  color: var(--color-accent);
}

strong { font-weight: 600; }
em { font-style: italic; }

hr {
  border: 0;
  border-top: 1px solid var(--color-rule);
  margin: 3em 0;
}

/* Layout
   ------------------------------------------------------------------------ */
.container {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 0 24px;
}

.reading-column {
  max-width: var(--measure);
  margin-left: auto;
  margin-right: auto;
}

/* Top navigation
   ------------------------------------------------------------------------ */
.site-nav {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-rule);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  background-color: rgba(250, 248, 243, 0.92);
}

.site-nav__inner {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-nav__brand {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-nav__brand-mark {
  color: var(--color-accent);
}

.site-nav__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  align-items: center;
}

.site-nav__links a {
  color: var(--color-ink-muted);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 4px 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* When a nav link IS a button, button styles win — preserve contrast. */
.site-nav__links a.btn--primary {
  color: white;
  border-bottom-color: transparent;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
}
.site-nav__links a.btn--primary:hover {
  color: white;
  background: var(--color-accent-dark);
  border-bottom-color: transparent;
}

.site-nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  cursor: pointer;
}

@media (max-width: 740px) {
  .site-nav__toggle { display: block; }
  .site-nav__links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 0 4px;
  }
  .site-nav__links.is-open { display: flex; }
  .site-nav__links li { width: 100%; }
  .site-nav__links a {
    display: block;
    padding: 8px 0;
    width: 100%;
    border-bottom: 1px solid var(--color-rule-soft);
  }
  .site-nav__inner { flex-wrap: wrap; }
}

/* Page footer
   ------------------------------------------------------------------------ */
.site-footer {
  margin-top: 6rem;
  padding: 2.5rem 24px 3rem;
  border-top: 1px solid var(--color-rule);
  color: var(--color-ink-soft);
  font-size: 0.92rem;
}

.site-footer__inner {
  max-width: var(--measure-wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: baseline;
  justify-content: space-between;
}

.site-footer__brand {
  font-family: var(--font-serif);
  color: var(--color-ink);
  font-size: 1rem;
}

/* Landing page — hero
   ------------------------------------------------------------------------ */
.hero {
  padding: 4.5rem 0 2.5rem;
}

.hero__eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 1rem;
  font-weight: 500;
}

.hero__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 5.5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  max-width: 14ch;
}

.hero__title em {
  font-style: italic;
  color: var(--color-accent);
}

.hero__tagline {
  font-size: 1.2rem;
  color: var(--color-ink-muted);
  max-width: 40ch;
  margin: 0;
}

/* Landing page — "how this works" strip
   ------------------------------------------------------------------------ */
.how-it-works {
  margin: 4rem 0 1rem;
}

.how-it-works__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 1.5rem;
}

.how-step {
  padding: 1.2rem 1.3rem 1.4rem;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
  position: relative;
}

.how-step__num {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
  margin: 0 0 0.3rem;
}

.how-step h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
}

.how-step p {
  margin: 0;
  color: var(--color-ink-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

@media (max-width: 860px) {
  .how-it-works__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .how-it-works__grid { grid-template-columns: 1fr; }
}

/* Landing page — checkpoint map
   ------------------------------------------------------------------------ */
.checkpoint-map {
  margin: 4rem 0 2rem;
}

.checkpoint-map__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 0.25rem;
}

.checkpoint-map__reset {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 4px 0;
  font-family: inherit;
}

.checkpoint-map__reset:hover { color: var(--color-accent); }

.checkpoint-map__legend {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  margin: 0.6rem 0 2rem;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}

.legend-dot--not-started { background: var(--color-not-started); }
.legend-dot--started     { background: var(--color-progress); }
.legend-dot--complete    { background: var(--color-complete); }

.map-group { margin-bottom: 2.25rem; }

.map-group__label {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-ink);
  font-weight: 500;
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.map-group__label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-rule);
}

.map-tracks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.map-tracks > div > h3 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  font-weight: 500;
  margin: 0 0 0.8rem;
}

@media (max-width: 640px) {
  .map-tracks { grid-template-columns: 1fr; gap: 2rem; }
}

.cp-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cp-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.cp-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.cp-card__status {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-not-started);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.78rem;
  font-family: var(--font-serif);
  font-weight: 500;
  margin-top: 2px;
  transition: background-color 0.2s ease;
}

.cp-card[data-status="started"] .cp-card__status  { background: var(--color-progress); }
.cp-card[data-status="complete"] .cp-card__status { background: var(--color-complete); }

.cp-card__body { flex: 1; min-width: 0; }

.cp-card__num {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin: 0 0 2px;
}

.cp-card__title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 500;
  line-height: 1.3;
  margin: 0;
  color: var(--color-ink);
}

.cp-card__meta {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  margin-top: 4px;
}

/* Breadcrumb
   ------------------------------------------------------------------------ */
.breadcrumb {
  max-width: var(--measure);
  margin: 2rem auto 0.5rem;
  padding: 0 24px;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--color-accent); }

.breadcrumb__sep {
  margin: 0 0.5em;
  color: var(--color-rule);
}

/* Section label styling (used on landing page, resources page) */
.section-label {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.55rem;
  letter-spacing: -0.01em;
  padding-bottom: 0.4rem;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid var(--color-rule);
  color: var(--color-ink);
}

/* Checkpoint page
   ------------------------------------------------------------------------ */
.checkpoint {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1rem 24px 3rem;
}

.checkpoint__eyebrow {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 500;
  margin: 1.2rem 0 0.8rem;
}

.checkpoint__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 0.6rem;
}

.checkpoint__subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--color-ink-muted);
  font-size: 1.15rem;
  margin: 0 0 1.5rem;
}

/* In-page progress bar (sticky under top nav)
   ------------------------------------------------------------------------ */
.cp-progress {
  position: sticky;
  top: 55px;   /* sits just below site-nav */
  z-index: 9;
  height: 3px;
  background: transparent;
  margin: 0;
}

.cp-progress__fill {
  height: 100%;
  background: var(--color-accent);
  width: 0%;
  transition: width 120ms linear;
  border-radius: 0 2px 2px 0;
}

/* TL;DR box (top of checkpoint)
   ------------------------------------------------------------------------ */
.tldr {
  background: var(--color-accent-soft);
  border-radius: var(--radius-lg);
  padding: 1.3rem 1.5rem 1.1rem;
  margin: 1.2rem 0 2.5rem;
  position: relative;
}

.tldr__label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent-dark);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.tldr p {
  margin: 0 0 0.5em;
  color: var(--color-ink);
  font-size: 0.98rem;
}

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

.tldr ul {
  margin: 0.4rem 0 0;
  padding-left: 1.2em;
  font-size: 0.95rem;
}

.tldr ul li { margin-bottom: 0.25em; }

/* Checkpoint meta row — read time + expand-all
   ------------------------------------------------------------------------ */
.cp-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 0.5rem 0 1rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-rule-soft);
  font-size: 0.85rem;
  color: var(--color-ink-soft);
}

.cp-meta__time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.cp-meta__time::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid var(--color-ink-soft);
  position: relative;
  top: 1px;
}

.cp-meta__expand-all {
  background: none;
  border: none;
  color: var(--color-accent);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 4px 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.cp-meta__expand-all:hover { color: var(--color-accent-dark); }

/* Collapsible sections
   ------------------------------------------------------------------------ */
.cp-section {
  margin: 1.2rem 0;
  border-bottom: 1px solid var(--color-rule);
}

.cp-section > summary {
  list-style: none;
  cursor: pointer;
  padding: 1.2rem 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  transition: color 0.15s ease;
}

.cp-section > summary::-webkit-details-marker { display: none; }

.cp-section > summary:hover { color: var(--color-accent); }

.cp-section__summary-left {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

.cp-section__num {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  font-weight: 500;
  letter-spacing: 0.08em;
  flex-shrink: 0;
  min-width: 2ch;
}

.cp-section__title { flex: 1; line-height: 1.25; }

.cp-section__meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  font-weight: 400;
  letter-spacing: 0;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.cp-section__time {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}

.cp-section__chevron {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--color-ink-soft);
  border-bottom: 1.5px solid var(--color-ink-soft);
  transform: rotate(45deg);
  transform-origin: center;
  transition: transform 0.2s ease;
  margin-bottom: 3px;
}

.cp-section[open] > summary .cp-section__chevron {
  transform: rotate(-135deg);
  margin-bottom: -2px;
}

.cp-section[data-complete="true"] > summary .cp-section__num::after {
  content: '✓';
  color: var(--color-complete);
  margin-left: 4px;
  font-weight: 600;
}

.cp-section__body {
  padding: 0.4rem 0 2rem;
  animation: cp-section-in 240ms ease;
}

@keyframes cp-section-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.cp-section__body > *:first-child { margin-top: 0; }

/* Diagrams
   ------------------------------------------------------------------------ */
.diagram {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
}

.diagram svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 560px;
  margin: 0 auto;
}

.diagram__caption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  margin: 0.8rem 0 0;
  font-style: italic;
  font-family: var(--font-serif);
}

/* Mini diagram sets (e.g. 4-example grid) */
.diagram-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 1.8rem 0;
}

@media (max-width: 560px) { .diagram-grid { grid-template-columns: 1fr; } }

.mini-diagram {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem 0.9rem;
}

.mini-diagram h5 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin: 0 0 0.4rem;
  font-weight: 600;
}

.mini-diagram p {
  font-size: 0.88rem;
  margin: 0 0 0.6rem;
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.mini-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Callout boxes
   ------------------------------------------------------------------------ */
.callout {
  background-color: var(--color-callout-bg);
  border-left: 3px solid var(--color-callout-border);
  padding: 1.25rem 1.4rem;
  margin: 1.8rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.callout > *:first-child { margin-top: 0; }
.callout > *:last-child  { margin-bottom: 0; }

.callout__label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: #8A5A1F;
  margin-bottom: 0.5rem;
}

/* Stuck box — distinct from callout */
.stuck-box {
  background-color: var(--color-stuck-bg);
  padding: 1.25rem 1.4rem;
  margin: 1.8rem 0;
  border-radius: var(--radius-md);
}

.stuck-box > *:first-child { margin-top: 0; }
.stuck-box > *:last-child  { margin-bottom: 0; }

.stuck-box__label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--color-ink-muted);
  margin-bottom: 0.5rem;
}

/* Sentence to remember */
.sentence-to-remember {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.3rem;
  line-height: 1.45;
  text-align: center;
  color: var(--color-ink);
  max-width: 32ch;
  margin: 2.5rem auto;
  padding: 1.5rem 1rem;
  position: relative;
}

.sentence-to-remember::before,
.sentence-to-remember::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--color-callout-border);
  margin: 0 auto;
}

.sentence-to-remember::before { margin-bottom: 1.2rem; }
.sentence-to-remember::after  { margin-top: 1.2rem; }

/* Tables
   ------------------------------------------------------------------------ */
.table-scroll {
  overflow-x: auto;
  margin: 1.8rem 0;
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--color-card-bg);
}

thead tr {
  background-color: var(--color-accent-soft);
}

th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-rule);
  font-size: 0.9rem;
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-rule-soft);
  vertical-align: top;
  line-height: 1.55;
}

tr:last-child td { border-bottom: none; }

/* Homework checkboxes
   ------------------------------------------------------------------------ */
.homework-list {
  list-style: none;
  padding: 0;
  margin: 1.3rem 0;
}

.homework-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  margin-bottom: 4px;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease;
}

.homework-list li:hover { background-color: var(--color-rule-soft); }

.homework-list input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--color-accent);
  border-radius: 3px;
  background: transparent;
  cursor: pointer;
  margin: 4px 0 0;
  flex-shrink: 0;
  position: relative;
  transition: background-color 0.15s ease;
}

.homework-list input[type="checkbox"]:checked {
  background-color: var(--color-accent);
}

.homework-list input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 0px;
  width: 6px;
  height: 11px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.homework-list label {
  cursor: pointer;
  flex: 1;
  line-height: 1.55;
}

.homework-list input:checked + label {
  color: var(--color-ink-soft);
  text-decoration: line-through;
  text-decoration-color: var(--color-ink-soft);
  text-decoration-thickness: 1px;
}

.homework-list h4 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  font-weight: 600;
}

/* "Know you've got it" and "What you'll understand" lists */
.outcome-list {
  list-style: none;
  padding: 0;
  margin: 1.3rem 0;
}

.outcome-list li {
  padding: 6px 0 6px 28px;
  position: relative;
}

.outcome-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 16px;
  width: 10px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* Stuck subheaders */
.stuck-item {
  margin-top: 1.5rem;
}

.stuck-item h4 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--color-ink);
  margin: 0 0 0.4rem;
  text-transform: none;
  letter-spacing: 0;
}

.stuck-item p {
  color: var(--color-ink-muted);
  margin-bottom: 0.8em;
}

/* Cheat sheet card
   ------------------------------------------------------------------------ */
.cheat-sheet {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: 2rem 2.2rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-soft);
  position: relative;
}

.cheat-sheet::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-accent);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.cheat-sheet h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.2rem;
  margin: 0 0 0.3rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cheat-sheet h4 {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin: 1.5rem 0 0.4rem;
  font-weight: 600;
}

.cheat-sheet h4:first-of-type { margin-top: 1rem; }

.cheat-sheet p { margin-bottom: 0.7em; }

.cheat-sheet ul {
  margin: 0.3rem 0 0.5rem;
  padding-left: 1.2em;
}

.cheat-sheet .sentence-to-remember {
  margin: 1.8rem auto 0.5rem;
  font-size: 1.15rem;
}

/* Prev / Next navigation
   ------------------------------------------------------------------------ */
.cp-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 4rem 0 0;
  padding-top: 2rem;
  border-top: 1px solid var(--color-rule);
}

.cp-nav a {
  text-decoration: none;
  color: var(--color-ink);
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  background: var(--color-card-bg);
  flex: 1;
  max-width: 48%;
  transition: border-color 0.15s ease;
}

.cp-nav a:hover { border-color: var(--color-accent); }

.cp-nav__direction {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.cp-nav__title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  color: var(--color-ink);
}

.cp-nav__next { text-align: right; margin-left: auto; }

/* Login page
   ------------------------------------------------------------------------ */
.login-wrapper {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 24px;
}

.login-card {
  max-width: 420px;
  width: 100%;
  background: var(--color-card-bg);
  padding: 2.5rem 2.2rem;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.login-card__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 0.6rem;
  font-weight: 500;
}

.login-card h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.75rem;
  margin: 0 0 0.8rem;
  letter-spacing: -0.01em;
}

.login-card p {
  color: var(--color-ink-muted);
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.login-form label {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  margin-bottom: -0.3rem;
}

.login-form input[type="password"] {
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-ink);
}

.login-form input[type="password"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.login-form button {
  padding: 12px 20px;
  font-size: 1rem;
  font-family: inherit;
  font-weight: 500;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.15s ease;
  margin-top: 0.4rem;
}

.login-form button:hover { background: var(--color-accent-dark); }

.login-form__error {
  color: #A8492F;
  font-size: 0.9rem;
  min-height: 1.2em;
  margin: 0.2rem 0 0;
}

/* Resources page
   ------------------------------------------------------------------------ */
.resources-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 1.5rem 0;
}

@media (max-width: 640px) { .resources-grid { grid-template-columns: 1fr; } }

.resource-item {
  padding: 14px 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-ink);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: border-color 0.15s ease;
}

.resource-item:hover { border-color: var(--color-accent); }

.resource-item__label {
  font-family: var(--font-serif);
  font-weight: 500;
}

.resource-item__meta {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
}

.faq-item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--color-rule-soft);
}

.faq-item:last-child { border-bottom: none; }

.faq-item summary {
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 500;
  padding: 0.2rem 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1;
}

.faq-item[open] summary::after { content: '−'; }

.faq-item p {
  margin: 0.8rem 0 0.2rem;
  color: var(--color-ink-muted);
}

/* Utility
   ------------------------------------------------------------------------ */
.muted { color: var(--color-ink-soft); }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* Print
   ------------------------------------------------------------------------ */
@media print {
  .site-nav, .site-footer, .cp-nav, .checkpoint-map__reset { display: none; }
  body { background: white; }
  .callout, .stuck-box, .cheat-sheet { page-break-inside: avoid; }
}

/* ==========================================================================
   Marketing site additions — only used on the public marketing site
   ========================================================================== */

/* Marketing hero — bigger, bolder than course hero */
.m-hero {
  padding: 5rem 0 3rem;
  max-width: 760px;
  margin: 0 auto;
}

.m-hero__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0.5rem 0 1.2rem;
  color: var(--color-ink);
}

.m-hero__title em {
  font-style: italic;
  color: var(--color-accent);
}

.m-hero__sub {
  font-size: 1.25rem;
  color: var(--color-ink-muted);
  line-height: 1.55;
  margin: 0 0 2rem;
  max-width: 56ch;
}

.m-hero__meta {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  margin: 0 0 2rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-rule);
  border-bottom: 1px solid var(--color-rule);
}

.m-hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.m-hero__meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  font-weight: 500;
}

.m-hero__meta-value {
  color: var(--color-ink);
  font-weight: 500;
  font-size: 1.05rem;
}

/* CTA buttons */
.m-cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  display: inline-block;
  padding: 14px 22px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  line-height: 1.3;
}

.btn--primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

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

.btn--secondary {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-rule);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

/* Section spacing */
.m-section {
  margin: 5rem 0;
}

.m-section__eyebrow {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 500;
  margin: 0 0 0.8rem;
}

.m-section__title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 0 0 1rem;
  max-width: 28ch;
}

.m-section__lead {
  font-size: 1.1rem;
  color: var(--color-ink-muted);
  max-width: 56ch;
  margin: 0 0 2rem;
  line-height: 1.6;
}

/* Who-this-is-for cards */
.m-fit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 2rem 0;
}

@media (max-width: 720px) {
  .m-fit-grid { grid-template-columns: 1fr; }
}

.m-fit-card {
  padding: 1.4rem 1.5rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
}

.m-fit-card h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.15rem;
  margin: 0 0 0.5rem;
  color: var(--color-ink);
  letter-spacing: -0.005em;
}

.m-fit-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.55;
}

/* Curriculum overview — visual map of the 10 checkpoints */
.m-curriculum {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
  margin: 2.5rem 0;
}

.m-curriculum__group h3 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  font-weight: 600;
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.m-curriculum__group h3::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-rule);
}

.m-curriculum__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

@media (max-width: 720px) {
  .m-curriculum__list { grid-template-columns: 1fr 1fr; }
}

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

.m-curriculum__item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
}

.m-curriculum__num {
  font-family: var(--font-serif);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0 0 0.15rem;
}

.m-curriculum__name {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  color: var(--color-ink);
  font-weight: 500;
  margin: 0;
  line-height: 1.3;
}

.m-curriculum__split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

@media (max-width: 640px) {
  .m-curriculum__split { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* How it works — numbered steps */
.m-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin: 2rem 0;
}

@media (max-width: 860px) { .m-steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .m-steps { grid-template-columns: 1fr; } }

.m-step {
  padding: 1.3rem 1.4rem;
  border-left: 2px solid var(--color-accent);
  background: transparent;
}

.m-step__num {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-accent);
  font-size: 1.6rem;
  margin: 0 0 0.3rem;
  line-height: 1;
}

.m-step h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: var(--color-ink);
}

.m-step p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--color-ink-muted);
  line-height: 1.55;
}

/* Pricing card */
.m-pricing {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
  margin: 2rem 0;
}

@media (max-width: 740px) {
  .m-pricing { grid-template-columns: 1fr; }
}

.m-pricing__copy h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.3rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.005em;
}

.m-pricing__copy p {
  color: var(--color-ink-muted);
  margin: 0 0 1rem;
}

.m-pricing__included {
  margin: 1.2rem 0;
  padding: 0;
  list-style: none;
}

.m-pricing__included li {
  padding: 6px 0 6px 24px;
  position: relative;
  color: var(--color-ink);
  font-size: 0.97rem;
}

.m-pricing__included li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 12px;
  height: 6px;
  border-left: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: rotate(-45deg);
}

.m-pricing__card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-lg);
  padding: 2rem 2.2rem;
  box-shadow: var(--shadow-soft);
  position: relative;
}

.m-pricing__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-accent);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.m-pricing__amount {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 400;
  color: var(--color-ink);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0.4rem 0 0.3rem;
}

.m-pricing__amount-meta {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  font-weight: 400;
  letter-spacing: 0;
}

.m-pricing__detail {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  margin: 0.4rem 0 1.4rem;
  line-height: 1.5;
}

.m-pricing__card .btn {
  width: 100%;
  text-align: center;
}

.m-pricing__small {
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  margin: 0.9rem 0 0;
  text-align: center;
}

/* About / who-teaches block */
.m-about {
  background: var(--color-accent-soft);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2.5rem;
  margin: 4rem 0;
}

@media (max-width: 600px) {
  .m-about { padding: 1.8rem 1.6rem; }
}

.m-about p {
  margin: 0 0 0.9em;
  color: var(--color-ink);
}

.m-about p:last-child { margin-bottom: 0; }

.m-about strong { color: var(--color-accent-dark); }

/* Waitlist form */
.m-waitlist {
  text-align: center;
  padding: 4rem 1.5rem;
  margin: 5rem 0 2rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule-soft);
  border-radius: var(--radius-lg);
}

.m-waitlist h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  letter-spacing: -0.015em;
  margin: 0 0 0.8rem;
}

.m-waitlist p {
  color: var(--color-ink-muted);
  max-width: 50ch;
  margin: 0 auto 1.8rem;
  line-height: 1.6;
}

.m-waitlist__embed {
  max-width: 480px;
  margin: 0 auto;
}

/* Beehiiv iframe will be injected here. We give the iframe a sensible height
   and let it manage its own internal styling. */
.m-waitlist__embed iframe {
  width: 100%;
  border: none;
  background: transparent;
}

/* Marketing footer — slightly fuller than course footer */
.m-footer {
  margin-top: 6rem;
  padding: 3rem 24px;
  border-top: 1px solid var(--color-rule);
  background: transparent;
}

.m-footer__inner {
  max-width: var(--measure-wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  align-items: flex-start;
}

.m-footer__col {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.m-footer__brand {
  font-family: var(--font-serif);
  color: var(--color-ink);
  font-size: 1.1rem;
  font-weight: 500;
  margin: 0 0 0.4rem;
}

.m-footer__col a {
  color: var(--color-ink-muted);
  text-decoration: none;
  display: inline-block;
  margin-right: 14px;
}

.m-footer__col a:hover { color: var(--color-accent); }