/* Avalanche AI — editorial theme. Zero JavaScript; motion is CSS only. */

/* ---------- fonts (self-hosted, no third-party requests) ---------- */
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/fraunces-roman-latin.woff2") format("woff2");
  font-weight: 300 900; font-style: normal; font-display: swap;
  unicode-range: U+0000-00FF, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/fraunces-roman-latin-ext.woff2") format("woff2");
  font-weight: 300 900; font-style: normal; font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+1E00-1E9F, U+1EF2-1EFF;
}
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/fraunces-italic-latin.woff2") format("woff2");
  font-weight: 300 900; font-style: italic; font-display: swap;
  unicode-range: U+0000-00FF, U+2000-206F, U+2074, U+20AC, U+2212, U+2215;
}
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/fraunces-italic-latin-ext.woff2") format("woff2");
  font-weight: 300 900; font-style: italic; font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+1E00-1E9F, U+1EF2-1EFF;
}

/* ---------- tokens ---------- */
:root {
  --paper: #f6f2ea;
  --paper-raise: #fdfaf4;
  --ink: #211d18;
  --ink-soft: #55503f;
  --muted: #8a8271;
  --rule: #ddd5c6;
  --accent: #0e5f63;
  --accent-ink: #0a4a4d;
  --accent-wash: #e3ecea;
  --display: "Fraunces", Georgia, serif;
  --body: Charter, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14171c;
    --paper-raise: #1b1f26;
    --ink: #eae5d9;
    --ink-soft: #b8b2a2;
    --muted: #7d8494;
    --rule: #2a2f38;
    --accent: #79d2c9;
    --accent-ink: #a7e6df;
    --accent-wash: #1d2b2c;
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 {
  font-family: var(--display);
  font-variation-settings: "opsz" 72;
  font-weight: 480;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 2.2em 0 0.5em;
}
h1 { font-size: clamp(2rem, 5vw, 2.9rem); margin-top: 0.6em; }
h2 { font-size: clamp(1.45rem, 3.4vw, 1.9rem); }
h3 { font-size: 1.2rem; }
p { margin: 0.9em 0; }
a { color: var(--accent); text-decoration: none; }
main a:not(.btn) {
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-size: 100% 1px;
  background-position: 0 100%;
  transition: background-size 160ms ease;
}
main a:not(.btn):hover { background-size: 100% 2px; }
a:focus-visible, .btn:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px;
}
::selection { background: var(--accent); color: var(--paper); }
strong { color: var(--ink); }
em { font-style: italic; }
blockquote {
  margin: 1.6em 0; padding: 0.2em 0 0.2em 1.2em;
  border-left: 2px solid var(--accent);
  font-family: var(--display); font-style: italic; font-size: 1.12em;
  color: var(--ink-soft);
}
code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--accent-wash); color: var(--accent-ink);
  padding: 0.12em 0.35em; border-radius: 4px;
}
pre {
  background: var(--paper-raise); border: 1px solid var(--rule); border-radius: 8px;
  padding: 1em 1.2em; overflow-x: auto; line-height: 1.5;
}
pre code { background: none; color: var(--ink-soft); padding: 0; font-size: 0.84rem; }
table { border-collapse: collapse; margin: 1.4em 0; width: 100%; font-size: 0.95em; }
td {
  border: 0; border-bottom: 1px solid var(--rule);
  padding: 0.55em 1em 0.55em 0; vertical-align: top;
}
tr:first-child td { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
ul { padding-left: 1.2em; }
li { margin: 0.35em 0; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5em 0; }

/* ---------- layout ---------- */
.wrap { max-width: 66rem; margin: 0 auto; padding: 0 1.4rem; }
article.prose { max-width: 44rem; margin: 0 auto; padding: 1rem 1.4rem 4rem; }

/* ---------- top navigation ---------- */
header.site {
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  position: sticky; top: 0; backdrop-filter: blur(6px); z-index: 5;
}
.nav { display: flex; align-items: baseline; gap: 1.6rem; padding: 0.9rem 0; flex-wrap: wrap; }
.wordmark {
  font-family: var(--display); font-weight: 620; font-size: 1.12rem;
  letter-spacing: -0.01em; color: var(--ink); margin-right: auto;
  display: inline-flex; align-items: baseline; gap: 0.45rem;
}
.wordmark .mark { color: var(--accent); font-size: 0.9em; transition: transform 300ms ease; display: inline-block; }
.wordmark:hover .mark { transform: rotate(180deg); }
.nav a:not(.wordmark) {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-soft);
}
.nav a:not(.wordmark):hover { color: var(--accent); }

/* ---------- freshness stamp ---------- */
.stamp {
  display: inline-flex; gap: 0.7em; align-items: center;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent-ink); border: 1.5px solid var(--accent);
  border-radius: 6px; padding: 0.38em 0.85em;
  transform: rotate(-1.2deg); background: var(--accent-wash);
  transition: transform 200ms ease;
}
.stamp:hover { transform: rotate(0.8deg) scale(1.03); }
.stamp .dot { opacity: 0.45; }
.pagehead { padding-top: 2.6rem; }
.pagehead .crumb {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 1.2rem; display: block;
}

/* ---------- hero ---------- */
.hero { padding-block: clamp(3.5rem, 9vw, 7rem) clamp(2.5rem, 6vw, 4.5rem); }
.hero .kicker {
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 1.6rem;
}
.hero h1 {
  font-size: clamp(2.5rem, 6.5vw, 4.6rem);
  font-weight: 380; font-variation-settings: "opsz" 144;
  max-width: 20ch; margin: 0 0 1.2rem;
}
.hero h1 em { font-style: italic; font-weight: 430; color: var(--accent); }
.hero .lede { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--ink-soft); max-width: 46ch; margin: 0 0 2.4rem; }
.hero .actions { display: flex; gap: 1.4rem; align-items: center; flex-wrap: wrap; }
.btn {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase;
  background: var(--accent); color: var(--paper); padding: 0.95em 1.7em; border-radius: 6px;
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 22px -10px var(--accent); }
.agent-note {
  font-family: var(--mono); font-size: 0.78rem; color: var(--muted);
}
.agent-note a { color: var(--accent); }

/* hero entrance — CSS only, stagger via delays */
@media (prefers-reduced-motion: no-preference) {
  .rise { opacity: 0; transform: translateY(14px); animation: rise 700ms cubic-bezier(0.2, 0.7, 0.2, 1) forwards; }
  .d1 { animation-delay: 60ms; } .d2 { animation-delay: 160ms; }
  .d3 { animation-delay: 280ms; } .d4 { animation-delay: 400ms; }
  @keyframes rise { to { opacity: 1; transform: none; } }
}

/* ---------- the loop diagram (pure CSS) ---------- */
.loop { border-top: 1px solid var(--rule); padding-block: 3.5rem; }
.loop-grid {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 1.5rem; align-items: center;
  max-width: 52rem; margin: 2rem auto 0;
}
.loop-node {
  border: 1.5px solid var(--ink); border-radius: 10px; padding: 1.5rem 1.6rem;
  background: var(--paper-raise); text-align: center;
}
.loop-node h3 { margin: 0 0 0.4rem; font-size: 1.35rem; }
.loop-node p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }
.loop-arrows { display: grid; gap: 0.6rem; text-align: center; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); }
.loop-arrows .arr { font-size: 1.5rem; line-height: 1; }
@media (max-width: 40rem) {
  .loop-grid { grid-template-columns: 1fr; }
  .loop-arrows .arr { transform: rotate(90deg); display: inline-block; }
}

/* ---------- method phases ---------- */
.phases { border-top: 1px solid var(--rule); padding-block: 3.5rem 2rem; }
.phase { display: grid; grid-template-columns: 5.5rem 1fr; gap: 1.6rem; padding: 1.8rem 0; border-bottom: 1px solid var(--rule); }
.phase:last-of-type { border-bottom: 0; }
.phase .num {
  font-family: var(--display); font-variation-settings: "opsz" 144;
  font-size: 3rem; font-weight: 320; color: var(--accent); line-height: 1;
}
.phase h3 { margin: 0.2rem 0 0.4rem; }
.phase p { margin: 0; color: var(--ink-soft); max-width: 52ch; }
.phase .dur { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }

/* ---------- library ---------- */
.library { border-top: 1px solid var(--rule); padding-block: 3.5rem 4rem; }
.lib-group { margin-bottom: 1.6rem; }
.lib-type {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--muted); margin: 2rem 0 0.4rem;
}
.lib-list { list-style: none; padding: 0; margin: 0; }
.lib-list li { margin: 0; border-bottom: 1px solid var(--rule); }
.lib-list a {
  display: grid; grid-template-columns: minmax(12rem, 18rem) 1fr auto; gap: 1.4rem;
  align-items: baseline; padding: 0.85rem 0.4rem; background: none; color: inherit;
  transition: background 160ms ease, transform 160ms ease;
}
.lib-list a:hover { background: var(--paper-raise); transform: translateX(4px); }
.lib-title { font-family: var(--display); font-weight: 540; font-size: 1.02rem; color: var(--ink); }
.lib-list a:hover .lib-title { color: var(--accent); }
.lib-summary { font-size: 0.9rem; color: var(--ink-soft); }
.lib-meta { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); white-space: nowrap; }
@media (max-width: 46rem) {
  .lib-list a { grid-template-columns: 1fr; gap: 0.15rem; }
  .lib-meta { display: none; }
}

/* ---------- section headers on home ---------- */
.sect-kicker {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 0.5rem;
}
.sect-title { margin: 0 0 0.6rem; font-size: clamp(1.6rem, 3.6vw, 2.2rem); }
.sect-lede { color: var(--ink-soft); max-width: 52ch; margin-top: 0; }

/* ---------- footer ---------- */
footer.site {
  border-top: 1.5px solid var(--ink);
  padding: 3rem 0 3.5rem; margin-top: 2rem;
}
.foot-grid { display: flex; gap: 2.5rem; flex-wrap: wrap; align-items: baseline; justify-content: space-between; }
.foot-brand { font-family: var(--display); font-weight: 620; font-size: 1.3rem; }
.foot-brand .mark { color: var(--accent); }
.foot-links { display: flex; gap: 1.6rem; flex-wrap: wrap; }
.foot-links a { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); }
.foot-links a:hover { color: var(--accent); }
.foot-note { font-size: 0.85rem; color: var(--muted); margin-top: 1.4rem; }
.foot-note code { font-size: 0.78em; }