:root {
  color-scheme: light;
  --paper: #f7f4ed;
  --paper-raised: #fffdf8;
  --ink: #20231f;
  --muted: #62675f;
  --line: #d8d4ca;
  --accent: #166534;
  --accent-soft: #dcfce7;
  --accent-dark: #14532d;
  --code: #18211a;
  --code-ink: #e7f8ea;
  --warn: #8a4b08;
  --warn-soft: #fff4d6;
  --shadow: 0 18px 50px rgba(47, 52, 43, 0.09);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(22, 101, 52, 0.09), transparent 30rem),
    var(--paper);
  font-size: 17px;
  line-height: 1.72;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.page {
  width: min(900px, calc(100% - 36px));
  margin: 0 auto;
  padding: 54px 0 88px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  font-weight: 650;
  line-height: 1.14;
  text-wrap: balance;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2.3rem, 7vw, 4.8rem);
  letter-spacing: -0.045em;
}

h2 {
  margin: 70px 0 16px;
  font-size: clamp(1.65rem, 4vw, 2.45rem);
  letter-spacing: -0.025em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.22rem;
}

.flush-heading {
  margin-top: 0;
}

.lede {
  max-width: 690px;
  margin: 22px 0 0;
  color: #3e443d;
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  font-size: clamp(1.18rem, 2.6vw, 1.48rem);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.86rem;
}

.meta span {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.68);
}

.card,
.quiz,
.template {
  margin: 22px 0;
  padding: clamp(20px, 5vw, 34px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.idea {
  border-left: 4px solid var(--accent);
}

.warning {
  border-left: 4px solid var(--warn);
  background: var(--warn-soft);
}

.loop {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 26px 0 12px;
  counter-reset: loop;
}

.loop article {
  position: relative;
  min-height: 160px;
  padding: 54px 18px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-raised);
}

.loop article::before {
  position: absolute;
  top: 16px;
  left: 18px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  color: white;
  background: var(--accent);
  content: counter(loop);
  counter-increment: loop;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 27px;
  text-align: center;
}

.loop p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
  line-height: 1.55;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

code {
  padding: 0.12em 0.36em;
  border-radius: 5px;
  background: #ece8de;
  font-size: 0.88em;
}

pre {
  overflow-x: auto;
  margin: 18px 0;
  padding: 22px;
  border-radius: 14px;
  color: var(--code-ink);
  background: var(--code);
  font-size: 0.87rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

pre code {
  padding: 0;
  background: transparent;
  font-size: inherit;
}

.checklist {
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  margin: 10px 0;
  padding-left: 30px;
}

.checklist li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: "✓";
  font-weight: 900;
}

.quiz-options {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.quiz button {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: #fbfaf6;
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.quiz button:hover,
.quiz button:focus-visible {
  border-color: var(--accent);
  outline: 2px solid transparent;
  background: var(--accent-soft);
}

.quiz button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.quiz-feedback {
  min-height: 1.8em;
  margin: 16px 0 0;
  font-weight: 700;
}

.quiz-feedback[data-state="correct"] {
  color: var(--accent-dark);
}

.quiz-feedback[data-state="incorrect"] {
  color: #9a3412;
}

.small,
figcaption,
footer {
  color: var(--muted);
  font-size: 0.86rem;
}

.rule {
  height: 1px;
  margin: 46px 0;
  border: 0;
  background: var(--line);
}

footer {
  margin-top: 74px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper-raised);
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 720px) {
  .page {
    padding-top: 34px;
  }

  .loop {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 460px) {
  .loop {
    grid-template-columns: 1fr;
  }
}

@media print {
  body {
    background: white;
    font-size: 11pt;
  }

  .page {
    width: auto;
    padding: 0;
  }

  .card,
  .quiz,
  .template,
  .loop article {
    break-inside: avoid;
    box-shadow: none;
  }

  a {
    color: inherit;
  }
}

/* ===== Prism Syntax Highlighting ===== */
pre[class*="language-"] {
  background: #1a1e1b !important;
  margin: 18px 0;
  padding: 22px;
  border-radius: 14px;
  font-size: 0.85rem;
  line-height: 1.65;
  overflow-x: auto;
  border: 1px solid rgba(255,255,255,0.05);
}

code[class*="language-"] {
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  text-shadow: none;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata { color: #6a737d; }

.token.punctuation { color: #c9d1d9; }

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol { color: #79c0ff; }

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin { color: #a5d6ff; }

.token.operator,
.token.entity,
.token.url { color: #d2a8ff; }

.token.atrule,
.token.attr-value,
.token.keyword { color: #ff7b72; }

.token.function,
.token.class-name { color: #d2a8ff; }

.token.regex,
.token.important,
.token.variable { color: #ffa657; }

.token.decorator,
.token.annotation { color: #d2a8ff; }

.token.string { color: #a5d6ff; }

.token.generic { color: #7ee787; }


/* Keep long equations usable on narrow screens. */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.35rem 0;
}