/* The Analog Algorithm — landing page
 * Document-paper aesthetic: serif body, generous spacing, warm off-white background.
 * No images. Inline diagrams via tables and code blocks. */

:root {
  --paper:    #faf8f3;
  --ink:      #1f1b16;
  --ink-soft: #4a443c;
  --rule:     #d8d2c4;
  --gold:     #9c7b2a;
  --code-bg:  #f0ece2;
  --serif: "Iowan Old Style", "Charter", "Cormorant Garamond", "EB Garamond", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.page {
  max-width: 680px;
  margin: 0 auto;
  padding: 6vh 24px 12vh;
}

/* Quiet wordmark, top-left */
.wordmark {
  font-family: var(--serif);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 12vh;
}

/* Hero */
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.5vw, 3.0rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 1.6rem;
  color: var(--ink);
}

.hero p.lede {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 3rem;
  max-width: 56ch;
}

.read-on {
  display: inline-block;
  font-size: 0.95rem;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  letter-spacing: 0.05em;
  margin-top: 1rem;
}

.read-on:hover { color: var(--ink); border-color: var(--ink); }

/* The 24-word grid: three columns, each is a small primitive table */
.primitives {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin: 4rem 0 6rem;
  font-size: 0.92rem;
}

.primitives section h4 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.6rem;
}

.primitives dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 12px;
  row-gap: 4px;
}

.primitives dt {
  font-family: var(--mono);
  color: var(--ink-soft);
  font-size: 0.85em;
}

.primitives dd {
  margin: 0;
  color: var(--ink);
}

/* Section dividers — the four suit ornaments */
.ornament {
  text-align: center;
  margin: 5rem 0 4rem;
  letter-spacing: 0.8em;
  color: var(--gold);
  font-size: 0.9rem;
}

/* Section headings */
h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: -0.005em;
  margin: 0 0 0.4rem;
  color: var(--ink);
}

h2 .num {
  color: var(--gold);
  font-weight: 500;
  margin-right: 0.6em;
  font-size: 0.85em;
}

h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.05rem;
  margin: 2.5rem 0 0.6rem;
  color: var(--ink);
}

p, li { color: var(--ink); }

p { margin: 0 0 1.2rem; }

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

/* Tables — minimal, paper-like */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8rem 0 2.4rem;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th {
  font-weight: 600;
  font-family: var(--serif);
  color: var(--ink-soft);
  border-bottom: 1px solid var(--ink);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Code blocks */
pre, code {
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--ink);
}

pre {
  background: var(--code-bg);
  border-radius: 4px;
  padding: 1rem 1.2rem;
  margin: 1.6rem 0 2.2rem;
  overflow-x: auto;
  line-height: 1.55;
}

code.inline {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.92em;
}

/* Pull-quote / aside box */
.aside {
  border-left: 2px solid var(--gold);
  padding: 0.4rem 0 0.4rem 1.4rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--ink-soft);
}

/* Inline try-it widget */
.try-it {
  background: var(--code-bg);
  border-radius: 6px;
  padding: 2rem 1.8rem;
  margin: 4rem 0;
}

.try-it h3 {
  margin-top: 0;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 600;
}

.try-it form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin: 1rem 0 1.2rem;
}

.try-it input[type="text"] {
  flex: 1 1 200px;
  padding: 10px 14px;
  border: 1px solid var(--rule);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--ink);
  border-radius: 4px;
}

.try-it input[type="text"]:focus {
  outline: none;
  border-color: var(--gold);
}

.try-it button {
  padding: 10px 22px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.try-it button:hover { background: transparent; color: var(--ink); }

.try-it .result {
  margin-top: 1.2rem;
  font-family: var(--serif);
  line-height: 1.5;
  display: none;
}

.try-it .result.shown { display: block; }

.try-it .result .card-line {
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  margin: 0.3rem 0;
}

.try-it .result .meaning {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.try-it .error {
  color: #8a3221;
  font-size: 0.9rem;
  margin-top: 0.8rem;
}

/* Bottom CTA */
.cta-bottom {
  text-align: center;
  margin: 8rem 0 4rem;
}

.cta-bottom a {
  display: inline-block;
  padding: 14px 36px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  border-radius: 4px;
}

.cta-bottom a:hover { background: transparent; color: var(--ink); }

.colophon {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.85rem;
  line-height: 1.5;
}

.colophon p { margin: 0 0 0.5rem; color: var(--ink-soft); }

/* P-array display */
.p-array {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  background: var(--code-bg);
  border-radius: 4px;
  padding: 1.2rem 1.4rem;
  margin: 1.6rem 0 2.2rem;
  overflow-x: auto;
  white-space: pre;
  color: var(--ink);
}

/* Responsive */
@media (max-width: 540px) {
  .page { padding: 4vh 18px 10vh; }
  .primitives { grid-template-columns: 1fr; gap: 24px; margin: 3rem 0 4rem; }
  body { font-size: 17px; }
  .hero h1 { font-size: clamp(1.6rem, 7vw, 2.1rem); }
  .hero p.lede { font-size: 1.05rem; }
  table { font-size: 0.88rem; }
  th, td { padding: 0.45rem 0.5rem; }
  .p-array { font-size: 0.72rem; padding: 0.9rem 1rem; }
  .ornament { letter-spacing: 0.5em; margin: 4rem 0 3rem; }
  .try-it { padding: 1.5rem 1.2rem; margin: 3rem 0; }
  .try-it input[type="text"] { flex: 1 1 100%; }
  .try-it button { flex: 1 1 100%; }
  .cta-bottom { margin: 6rem 0 3rem; }
  h2 { font-size: 1.3rem; }
}

@media (max-width: 380px) {
  .hero h1 { font-size: clamp(1.5rem, 6.5vw, 1.9rem); }
  body { font-size: 16px; }
}