@import "tailwindcss";

/* ============================================================
   AIBook.fun — "field guide" design system
   Tokens live in @theme so they're available BOTH as CSS vars
   (var(--color-pine)) and as Tailwind utilities (bg-pine, font-display).
   ============================================================ */
@theme {
  --color-paper: #fcfbf8;      /* warm near-white ground (chosen, not cream cliché) */
  --color-paper-2: #f6f4ee;    /* recessed band */
  --color-card: #ffffff;       /* raised surfaces */
  --color-ink: #1a1613;        /* warm near-black text */
  --color-muted: #6e675e;      /* warm stone secondary */
  --color-line: #e7e1d7;       /* warm hairline */
  --color-line-2: #d8d1c4;     /* stronger hairline */
  --color-pine: #1c5d4c;       /* THE accent — field-guide green */
  --color-pine-deep: #12463a;
  --color-pine-tint: rgba(28, 93, 76, 0.1);
  --color-pine-wash: rgba(28, 93, 76, 0.06);
  --color-amber: #b4791f;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Hanken Grotesk", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

:root {
  --sh-sm: 0 1px 2px rgba(26, 22, 19, 0.05), 0 1px 3px rgba(26, 22, 19, 0.04);
  --sh-md: 0 4px 10px rgba(26, 22, 19, 0.06), 0 2px 4px rgba(26, 22, 19, 0.04);
  --sh-lg: 0 18px 40px -12px rgba(26, 22, 19, 0.12), 0 6px 14px rgba(26, 22, 19, 0.05);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --wrap: 1080px;
}

/* ============ BASE ============ */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
::selection {
  background: var(--color-pine-tint);
  color: var(--color-pine-deep);
}
a { color: inherit; text-decoration: none; }
h1, h2, h3 { text-wrap: balance; margin: 0; }
@media (max-width: 720px) { body { font-size: 16px; } }

/* ============ LAYOUT PRIMITIVES ============ */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.section { padding: 104px 0; }
@media (max-width: 900px) { .section { padding: 84px 0; } }
@media (max-width: 600px) {
  .wrap { padding: 0 20px; }
  .section { padding: 64px 0; }
}

.spec {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-pine);
}
.serif-it { font-family: var(--font-display); font-style: italic; font-weight: 500; }
.hl {
  background: linear-gradient(transparent 62%, var(--color-pine-tint) 62%);
  padding: 0 0.06em;
}

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--font-body); font-weight: 700; font-size: 15px; letter-spacing: -0.01em;
  border-radius: 999px; padding: 15px 26px; cursor: pointer; border: 1px solid transparent;
  transition: transform 0.14s var(--ease), box-shadow 0.14s var(--ease), background 0.18s var(--ease);
}
.btn-primary { background: var(--color-pine); color: #f7fbf9; box-shadow: 0 6px 18px -6px rgba(28, 93, 76, 0.5); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 26px -8px rgba(28, 93, 76, 0.55); }
.btn-primary:active { transform: translateY(0) scale(0.99); }
.btn-ghost { background: var(--color-card); color: var(--color-ink); border-color: var(--color-line-2); }
.btn-ghost:hover { transform: translateY(-1px); box-shadow: var(--sh-md); }
.btn:focus-visible { outline: 2px solid var(--color-pine); outline-offset: 3px; }

/* ============ REVEAL (only hides when JS can un-hide) ============ */
.js .reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

/* ============ NAV ============ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-paper);
  border-bottom: 1px solid transparent; transition: border-color 0.3s, box-shadow 0.3s;
}
.nav.scrolled { border-bottom-color: var(--color-line); box-shadow: var(--sh-sm); }
.nav-in {
  position: relative;
  max-width: var(--wrap); margin: 0 auto; padding: 0 28px; height: 68px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.logo {
  display: flex; align-items: baseline; gap: 2px;
  font-family: var(--font-display); font-weight: 900; font-size: 21px; letter-spacing: -0.02em;
  flex: none; position: relative; z-index: 1;
}
.logo b { color: var(--color-pine); }
.logo .dot { color: var(--color-muted); font-weight: 500; }
.nav-links {
  display: flex; align-items: center; gap: 30px;
  font-size: 14.5px; font-weight: 600; color: var(--color-muted);
  position: absolute; left: 50%; transform: translateX(-50%);
}
.nav-links a { transition: color 0.18s; }
.nav-links a:hover { color: var(--color-ink); }
.nav-actions {
  display: flex; align-items: center; gap: 10px;
  flex: none; margin-left: auto; position: relative; z-index: 1;
}
.nav-cta { font-size: 14px; padding: 10px 18px; }

/* mobile hamburger toggle (hidden on desktop) */
.nav-toggle {
  display: none; width: 44px; height: 44px; align-items: center; justify-content: center;
  padding: 0; border: 1px solid var(--color-line-2); border-radius: 12px;
  background: var(--color-card); cursor: pointer; flex: none;
}
.nav-toggle:focus-visible { outline: 2px solid var(--color-pine); outline-offset: 3px; }
.nav-toggle .bars, .nav-toggle .bars::before, .nav-toggle .bars::after {
  content: ""; display: block; width: 18px; height: 2px; border-radius: 2px;
  background: var(--color-ink); transition: transform 0.25s var(--ease), opacity 0.2s;
}
.nav-toggle .bars { position: relative; }
.nav-toggle .bars::before { position: absolute; left: 0; top: -6px; }
.nav-toggle .bars::after { position: absolute; left: 0; top: 6px; }
.nav.open .nav-toggle .bars { background: transparent; }
.nav.open .nav-toggle .bars::before { transform: translateY(6px) rotate(45deg); }
.nav.open .nav-toggle .bars::after { transform: translateY(-6px) rotate(-45deg); }

/* mobile dropdown menu (rendered on desktop as display:none) */
.nav-menu { display: none; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .nav-cta { display: none; }           /* CTA moves into the menu */
  .nav-toggle { display: inline-flex; }
  .nav-menu {
    display: flex; flex-direction: column; gap: 2px;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--color-paper); border-bottom: 1px solid var(--color-line);
    box-shadow: var(--sh-lg); padding: 10px 20px 20px;
    opacity: 0; visibility: hidden; transform: translateY(-8px); pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.25s var(--ease), visibility 0.2s;
  }
  .nav.open .nav-menu { opacity: 1; visibility: visible; transform: none; pointer-events: auto; }
  .nav-menu a:not(.btn) {
    font-family: var(--font-body); font-weight: 600; font-size: 1.05rem; color: var(--color-ink);
    padding: 15px 6px; border-bottom: 1px solid var(--color-line);
  }
  .nav-menu a:not(.btn):hover { color: var(--color-pine); }
  .nav-menu .btn { margin-top: 14px; justify-content: center; width: 100%; }
}
@media (max-width: 600px) { .nav-in { padding: 0 20px; } }

/* ============ HERO ============ */
.hero { padding: 78px 0 72px; position: relative; overflow: hidden; }
.hero-tabs { position: absolute; top: 0; right: max(28px, calc(50% - var(--wrap) / 2 + 28px)); display: flex; gap: 6px; opacity: 0.5; }
.hero-tabs span { width: 34px; height: 8px; border-radius: 0 0 4px 4px; background: var(--color-line-2); }
.hero-tabs span:first-child { background: var(--color-pine); opacity: 0.85; }
.eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 26px; }
.eyebrow .tick { width: 7px; height: 7px; border-radius: 999px; background: var(--color-pine); flex: none; }
.hero h1 { font-family: var(--font-display); font-weight: 900; font-size: clamp(2.7rem, 6.4vw, 5.1rem); line-height: 0.98; letter-spacing: -0.028em; max-width: 15ch; margin-bottom: 26px; }
.hero-sub { font-size: clamp(1.1rem, 1.7vw, 1.35rem); color: var(--color-muted); line-height: 1.62; max-width: 33rem; margin-bottom: 16px; }
.hero-form { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 30px; max-width: 34rem; }
.field {
  flex: 1; min-width: 220px; font-family: var(--font-body); font-size: 15.5px; color: var(--color-ink);
  background: var(--color-card); border: 1px solid var(--color-line-2); border-radius: 999px; padding: 15px 22px;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.field::placeholder { color: #a49c90; }
.field:focus { outline: none; border-color: var(--color-pine); box-shadow: 0 0 0 4px var(--color-pine-wash); }
.hero-note { font-family: var(--font-mono); font-size: 12px; color: var(--color-muted); margin-top: 16px; }
.hero-note b { color: var(--color-pine); font-weight: 600; }
@media (max-width: 720px) { .hero-tabs { display: none; } .hero { padding: 56px 0 56px; } }
@media (max-width: 600px) { .spec { letter-spacing: 0.1em; font-size: 11px; } }

/* ============ HERO TWO-COLUMN + 3D BOOK ============ */
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 72px; align-items: center; }
.hero-visual { display: flex; justify-content: center; order: 2; }  /* book on the right */
.hero-copy { min-width: 0; order: 1; }                              /* text on the left */

.book3d { --bw: 300px; --bh: 420px; --bt: 54px; --band-h: 58px; position: relative; perspective: 2000px; flex: none; padding: 6px 0 40px; }
.book3d__inner {
  position: relative; width: var(--bw); height: var(--bh); margin: 0 auto;
  transform-style: preserve-3d; transform: rotateX(7deg) rotateY(-34deg);
  animation: book-float 8s ease-in-out infinite; will-change: transform;
}
.book3d:hover .book3d__inner { transform: rotateX(5deg) rotateY(-22deg); transition: transform 0.7s var(--ease); animation-play-state: paused; }
@keyframes book-float {
  0%, 100% { transform: rotateX(7deg) rotateY(-34deg) translateY(0); }
  50% { transform: rotateX(5deg) rotateY(-30deg) translateY(-12px); }
}
.book3d__face { position: absolute; top: 0; left: 0; }
.book3d__cover, .book3d__back { width: var(--bw); height: var(--bh); }
.book3d__cover {
  transform: translateZ(calc(var(--bt) / 2)); border-radius: 3px 8px 8px 3px; overflow: hidden;
  background: linear-gradient(125deg, #23745f, #1a5748 48%, #123f34);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07), inset 8px 0 16px -8px rgba(0, 0, 0, 0.5), 0 32px 46px -22px rgba(18, 63, 52, 0.55);
  padding: 32px 27px calc(var(--band-h) * 1.48); display: flex; flex-direction: column;
}
.book3d__back { transform: rotateY(180deg) translateZ(calc(var(--bt) / 2)); border-radius: 8px 3px 3px 8px; background: #0f3b30; }
.book3d__pages {
  width: var(--bt); height: calc(var(--bh) - 6px); top: 3px; left: calc((var(--bw) - var(--bt)) / 2);
  transform: rotateY(90deg) translateZ(calc(var(--bw) / 2));
  background: repeating-linear-gradient(to left, #efe9db 0, #efe9db 1px, #d6cdba 1px, #d6cdba 3px);
}
.book3d__spine {
  width: var(--bt); height: var(--bh); left: calc((var(--bw) - var(--bt)) / 2);
  transform: rotateY(-90deg) translateZ(calc(var(--bw) / 2));
  background: linear-gradient(#174f41, #0f3b30); display: flex; align-items: center; justify-content: center;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}
.book3d__spine span {
  writing-mode: vertical-rl; transform: rotate(180deg); white-space: nowrap;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(239, 233, 219, 0.72);
}
.book3d__top {
  width: var(--bw); height: var(--bt); top: calc((var(--bh) - var(--bt)) / 2);
  transform: rotateX(90deg) translateZ(calc(var(--bh) / 2));
  background: repeating-linear-gradient(to right, #efe9db 0, #efe9db 1px, #d6cdba 1px, #d6cdba 3px);
}
.book3d__kicker { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(239, 233, 219, 0.62); }
.book3d__title { font-family: var(--font-display); font-weight: 600; font-size: 2.25rem; line-height: 1.02; letter-spacing: -0.02em; color: #f3eee2; margin-top: 16px; }
.book3d__line { width: 34px; height: 2px; background: rgba(239, 233, 219, 0.5); margin: 15px 0; }
.book3d__sub { font-family: var(--font-body); font-size: 13px; color: rgba(239, 233, 219, 0.68); line-height: 1.45; max-width: 16ch; }
.book3d__foot { display: flex; align-items: center; gap: 10px; margin-top: auto; }
.book3d__mark { width: 30px; height: 30px; flex: none; }
/* Belly band: a promotional strip wrapped across the lower cover, publisher-
   style, rather than redesigning the whole face around the source graphic.
   The <img> is width-locked to the band and shifted up so the crop stays
   full-width (legible "AMERICAN" wordmark) and only trims top/bottom. */
.book3d__band {
  position: absolute; left: 0; right: 0; bottom: calc(var(--band-h) * 0.31);
  height: var(--band-h); overflow: hidden;
  box-shadow: 0 -1px 0 rgba(255, 255, 255, 0.1) inset, 0 3px 10px rgba(0, 0, 0, 0.3);
}
.book3d__band img {
  position: absolute; left: 0; top: -78%; width: 100%; height: auto; display: block;
}
.book3d__brand { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: rgba(239, 233, 219, 0.85); }
.book3d::after {
  content: ""; position: absolute; left: 50%; bottom: 6px; width: 60%; height: 24px; transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(18, 60, 50, 0.3), transparent 70%); filter: blur(7px); z-index: -1;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { order: 2; }
  .hero-copy { order: 1; }
  .book3d { --bw: 256px; --bh: 358px; --bt: 48px; --band-h: 50px; }
}
@media (max-width: 420px) { .book3d { --bw: 210px; --bh: 294px; --bt: 40px; --band-h: 40px; } }
@media (prefers-reduced-motion: reduce) { .book3d__inner { animation: none; } }

/* ============ FIELD NOTES (even gutters, aligned to container edges) ============ */
.notes { background: var(--color-paper-2); border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.notes-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.note { padding: 48px 36px; border-left: 1px solid var(--color-line); }
.note:first-child { border-left: none; padding-left: 0; }
.note:last-child { padding-right: 0; }
.note .n { font-family: var(--font-mono); font-size: 12px; color: var(--color-pine); letter-spacing: 0.12em; margin-bottom: 16px; }
.note h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.35rem; letter-spacing: -0.02em; margin-bottom: 12px; line-height: 1.15; }
.note p { font-size: 15px; color: var(--color-muted); line-height: 1.6; }
@media (max-width: 760px) {
  .notes-grid { grid-template-columns: 1fr; }
  .note { padding: 32px 0; border-left: none; border-top: 1px solid var(--color-line); }
  .note:first-child { border-top: none; padding-top: 0; }
  .note:last-child { padding-bottom: 0; }
}

/* ============ RECIPE (value centerpiece) ============ */
.recipe-head { max-width: 40rem; margin-bottom: 44px; }
.recipe-head h2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(2rem, 4.3vw, 3.3rem); letter-spacing: -0.025em; line-height: 1.15; margin: 16px 0 18px; }
.recipe-head p { color: var(--color-muted); font-size: 1.08rem; }
.recipe { background: var(--color-card); border: 1px solid var(--color-line); border-radius: 20px; box-shadow: var(--sh-lg); overflow: hidden; }
.recipe-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 28px; border-bottom: 1px solid var(--color-line); background: linear-gradient(var(--color-card), var(--color-paper)); }
.recipe-id { font-family: var(--font-mono); font-size: 12.5px; color: var(--color-muted); letter-spacing: 0.04em; }
.recipe-id b { color: var(--color-pine); }
.recipe-vert { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-pine); background: var(--color-pine-wash); border: 1px solid var(--color-pine-tint); padding: 5px 11px; border-radius: 999px; white-space: nowrap; }
.recipe-body { padding: 34px 28px; }
.recipe-title { font-family: var(--font-display); font-weight: 600; font-size: 1.55rem; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 26px; max-width: 34rem; }
.row { display: grid; grid-template-columns: 118px 1fr; gap: 20px; padding: 18px 0; border-top: 1px dashed var(--color-line-2); }
.row:first-of-type { border-top: none; padding-top: 0; }
.row .k { font-family: var(--font-mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-pine); padding-top: 3px; }
.row .v { font-size: 15.5px; color: var(--color-ink); line-height: 1.6; }
.row .v .sub { color: var(--color-muted); font-size: 14.5px; }
/* Let grid items shrink below their content width so the terminal's own
   overflow-x:auto engages (scrolls) instead of the row expanding + being clipped. */
.row > * { min-width: 0; }
.term { max-width: 100%; }
.steps { counter-reset: s; display: flex; flex-direction: column; gap: 11px; margin: 0; padding: 0; }
.steps li { list-style: none; display: flex; gap: 12px; font-size: 15px; color: var(--color-ink); }
.steps li::before {
  counter-increment: s; content: counter(s);
  font-family: var(--font-mono); font-size: 11px; font-weight: 600; color: var(--color-pine);
  background: var(--color-pine-wash); width: 22px; height: 22px; border-radius: 6px;
  display: grid; place-items: center; flex: none; margin-top: 1px;
}
.term { margin-top: 14px; background: #14110e; border-radius: 12px; overflow: hidden; border: 1px solid #2a241d; }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; border-bottom: 1px solid #2a241d; }
.term-bar i { width: 11px; height: 11px; border-radius: 999px; background: #3a342b; display: block; }
.term-bar span { font-family: var(--font-mono); font-size: 11px; color: #8a8175; margin-left: 8px; letter-spacing: 0.03em; }
.term pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-family: var(--font-mono); font-size: 12.5px; line-height: 1.7; color: #d8d0c4; }
.term .c-user { color: #7fc8a9; }
.term .c-key { color: #e0b96b; }
.term .c-dim { color: #8a8175; }
.term .c-ok { color: #7fc8a9; }
.chip { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 12px; color: var(--color-amber); background: rgba(180, 121, 31, 0.08); border: 1px solid rgba(180, 121, 31, 0.2); padding: 4px 10px; border-radius: 999px; }
.guard { display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; color: var(--color-muted); padding: 8px 0; }
.guard svg { flex: none; margin-top: 2px; }
@media (max-width: 640px) {
  .row { grid-template-columns: 1fr; gap: 8px; }
  .recipe-body { padding: 26px 20px; }
  .recipe-top { padding: 16px 20px; }
}

/* ============ CONTENTS (table-of-contents) ============ */
.contents { background: var(--color-paper-2); border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.contents h2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(1.9rem, 4vw, 3rem); letter-spacing: -0.025em; line-height: 1.2; margin: 14px 0 34px; max-width: 20ch; }
.toc { border-top: 1px solid var(--color-line-2); }
.toc a { display: grid; grid-template-columns: 52px 1fr auto auto; align-items: center; gap: 20px; padding: 22px 8px; border-bottom: 1px solid var(--color-line); transition: background 0.2s, padding 0.2s; }
.toc a:hover { background: var(--color-pine-wash); padding-left: 16px; }
.toc .num { font-family: var(--font-mono); font-size: 13px; color: var(--color-muted); }
.toc .name { font-family: var(--font-display); font-weight: 600; font-size: 1.32rem; letter-spacing: -0.02em; }
.toc .desc { font-size: 14px; color: var(--color-muted); justify-self: end; text-align: right; max-width: 24rem; }
.toc .arrow { color: var(--color-pine); opacity: 0; transition: opacity 0.2s, transform 0.2s; font-family: var(--font-mono); }
.toc a:hover .arrow { opacity: 1; transform: translateX(3px); }
@media (max-width: 720px) { .toc .desc { display: none; } .toc a { grid-template-columns: 40px 1fr auto; } }

/* ============ LETTER (human) ============ */
.letter { background: var(--color-pine-deep); color: #eaf1ec; position: relative; overflow: hidden; }
.letter::before { content: ""; position: absolute; inset: 0; background: radial-gradient(120% 90% at 85% 0%, rgba(255, 255, 255, 0.06), transparent 60%); pointer-events: none; }
.letter-in { max-width: 720px; margin: 0 auto; padding: 0 28px; position: relative; }
.letter .spec { color: #8fbeae; }
.letter-body { font-family: var(--font-display); font-weight: 400; font-size: clamp(1.4rem, 2.6vw, 1.95rem); line-height: 1.42; letter-spacing: -0.01em; margin: 22px 0 30px; }
.letter-body em { font-style: italic; color: #fff; }
.letter-body .mark { background: rgba(143, 190, 174, 0.18); padding: 0 0.08em; border-radius: 2px; }
.sign { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.sign .scrawl { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 1.5rem; color: #fff; }
.sign .who { font-family: var(--font-mono); font-size: 12px; color: #8fbeae; letter-spacing: 0.04em; line-height: 1.5; }
@media (max-width: 600px) { .letter-in { padding: 0 20px; } }

/* ============ AUTHORS ============ */
.authors h2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(1.9rem, 3.6vw, 2.7rem); letter-spacing: -0.025em; line-height: 1.2; margin: 14px 0 10px; }
.authors .lede { color: var(--color-muted); max-width: 38rem; margin-bottom: 38px; }
.auth-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.auth { background: var(--color-card); border: 1px solid var(--color-line); border-radius: 16px; padding: 24px; box-shadow: var(--sh-sm); transition: box-shadow 0.2s, transform 0.2s; }
.auth:hover { box-shadow: var(--sh-md); transform: translateY(-2px); }
.auth .mono-tile { width: 46px; height: 46px; border-radius: 11px; display: grid; place-items: center; font-family: var(--font-mono); font-weight: 600; font-size: 16px; color: var(--color-pine); background: var(--color-pine-wash); border: 1px solid var(--color-pine-tint); margin-bottom: 16px; }
.auth h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; letter-spacing: -0.02em; margin-bottom: 4px; }
.auth .role { font-size: 13.5px; color: var(--color-muted); margin-bottom: 12px; }
.auth .status { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px; }
.auth .status.confirmed { color: var(--color-pine); }
.auth .status.tba { color: var(--color-muted); }
.auth .status i { width: 6px; height: 6px; border-radius: 999px; background: currentColor; display: block; }
.auth-join { display: grid; place-content: center; text-align: center; background: var(--color-pine-wash); border-style: dashed; border-color: var(--color-pine-tint); }
.auth-join p { font-size: 14px; color: var(--color-muted); max-width: 15rem; }
@media (max-width: 900px) { .auth-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .auth-grid { grid-template-columns: 1fr; } }

/* ============ EMAIL CAPTURE ============ */
.capture { background: var(--color-paper-2); border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.capture-in { max-width: 640px; margin: 0 auto; text-align: center; padding: 0 28px; }
.capture h2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.025em; line-height: 1.15; margin: 16px 0 14px; }
.capture p { color: var(--color-muted); font-size: 1.06rem; margin-bottom: 28px; }
.capture form { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.capture .fine { font-family: var(--font-mono); font-size: 11.5px; color: var(--color-muted); margin-top: 18px; }
.ok-msg { font-family: var(--font-mono); font-size: 14px; color: var(--color-pine); }
@media (max-width: 600px) { .capture-in { padding: 0 20px; } }

/* ============ TIERS PREVIEW ============ */
.tiers-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 34px; }
.tiers-head h2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(1.9rem, 3.6vw, 2.7rem); letter-spacing: -0.025em; line-height: 1.2; margin: 12px 0 0; }
.tiers-note { font-family: var(--font-mono); font-size: 12px; color: var(--color-muted); max-width: 22rem; text-align: right; line-height: 1.6; }
.tier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.tier { background: var(--color-card); border: 1px solid var(--color-line); border-radius: 18px; padding: 30px 26px; display: flex; flex-direction: column; transition: box-shadow 0.2s, transform 0.2s; }
.tier:hover { box-shadow: var(--sh-md); transform: translateY(-2px); }
.tier.feature { background: var(--color-pine); color: #eaf1ec; border-color: var(--color-pine); }
.tier .t-name { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 16px; }
.tier .t-price { font-family: var(--font-display); font-weight: 900; font-size: 2.4rem; letter-spacing: -0.03em; line-height: 1; margin-bottom: 6px; }
.tier .t-price small { font-family: var(--font-body); font-size: 1rem; font-weight: 600; color: var(--color-muted); }
.tier.feature .t-price small { color: #9dc4b5; }
.tier .t-unit { font-size: 13px; color: var(--color-muted); margin-bottom: 18px; }
.tier.feature .t-unit { color: #9dc4b5; }
.tier .t-desc { font-size: 14.5px; color: var(--color-muted); line-height: 1.6; }
.tier.feature .t-desc { color: #cfe0d6; }
.tier .t-tag { align-self: flex-start; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; background: #eaf1ec; color: var(--color-pine-deep); padding: 4px 10px; border-radius: 999px; margin-bottom: 16px; }
@media (max-width: 820px) { .tier-grid { grid-template-columns: 1fr; } .tiers-note { text-align: left; } }

/* ============ FAQ ============ */
.faq h2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(1.9rem, 3.6vw, 2.7rem); letter-spacing: -0.025em; line-height: 1.2; margin-bottom: 34px; }
.qa { border-top: 1px solid var(--color-line); }
.qa details { border-bottom: 1px solid var(--color-line); padding: 6px 0; }
.qa summary { cursor: pointer; list-style: none; padding: 20px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; letter-spacing: -0.02em; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary .pl { font-family: var(--font-mono); color: var(--color-pine); font-size: 1.1rem; transition: transform 0.2s var(--ease); flex: none; }
.qa details[open] summary .pl { transform: rotate(45deg); }
.qa .ans { padding: 0 40px 22px 0; color: var(--color-muted); font-size: 16px; line-height: 1.65; }
@media (max-width: 600px) { .qa .ans { padding-right: 0; } }

/* ============ FOOTER ============ */
.footer { background: var(--color-ink); color: #d8d0c4; }
.foot-in { max-width: var(--wrap); margin: 0 auto; padding: 64px 28px 48px; }
.foot-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 40px; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.foot-top .logo { color: #f7f5f0; font-size: 24px; }
.foot-top .logo b { color: #7fc8a9; }
.foot-top .logo .dot { color: #8a8175; }
.foot-blurb { max-width: 24rem; font-size: 14.5px; color: #9a9184; margin-top: 14px; line-height: 1.6; }
.foot-links { display: flex; gap: 28px; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.03em; color: #9a9184; flex-wrap: wrap; }
.foot-links a:hover { color: #f7f5f0; }
.colophon { padding-top: 26px; font-family: var(--font-mono); font-size: 11.5px; color: #7a7266; letter-spacing: 0.02em; line-height: 1.8; }
@media (max-width: 600px) { .foot-in { padding: 48px 20px 40px; } }

/* ============ READER DEMO ============ */
/* Layout the landing page does not already have. Reader pages use a wider wrap.
   Same tokens, same ~20px cards and 999px pills. Do not restyle the homepage recipe. */

.demo-chip {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-amber);
  background: rgba(180, 121, 31, 0.08);
  border: 1px solid rgba(180, 121, 31, 0.22);
  padding: 5px 12px; border-radius: 999px;
  margin-bottom: 22px;
}


.reader-nav .nav-in,
.reader-footer .foot-in,
.wrap.reader-wide {
  max-width: min(1520px, calc(100vw - 40px));
}


.crumbs {
  padding: 4px 0 18px;
  font-size: 13.5px;
}
.crumbs ol {
  display: flex; flex-wrap: wrap; align-items: center;
  list-style: none; margin: 0; padding: 0;
}
.crumbs li { display: flex; align-items: center; }
.crumbs-sep {
  margin: 0 10px; color: var(--color-muted); font-weight: 400;
}
.crumbs a { color: var(--color-pine); font-weight: 600; }
.crumbs a:hover { color: var(--color-pine-deep); }
.crumbs [aria-current="page"] { color: var(--color-ink); font-weight: 600; }

.reader-nav .nav-title {
  font-size: 14.5px; font-weight: 600; color: var(--color-ink);
}
.reader-nav .nav-title:hover { color: var(--color-pine); }

.reader-nav .reader-links { gap: 22px; }
.reader-nav .nav-current {
  font-size: 14.5px; font-weight: 600; color: var(--color-ink);
  max-width: 22ch; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
@media (max-width: 860px) {
  .reader-nav .nav-links {
    display: flex; align-items: center; gap: 16px; font-size: 13.5px;
  }
  .reader-nav .nav-cta {
    display: inline-flex; font-size: 13px; padding: 8px 14px;
  }
  .reader-nav .nav-current { display: none; }
  .reader-nav .nav-toggle { display: none; }
}

.chapter-page { padding: 48px 0 96px; }
.chapter-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 32px 40px;
  align-items: start;
}
@media (min-width: 1080px) {
  .chapter-shell {
    grid-template-columns: 240px minmax(0, 1fr) 280px;
  }
}
.chapter-col { min-width: 0; }
.chapter-kicker { margin: 8px 0 14px; }
.chapter-title {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
  letter-spacing: -0.028em; line-height: 1.15; margin: 0 0 12px;
  max-width: 22ch;
}
.chapter-by {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--color-muted);
  letter-spacing: 0.04em; margin-bottom: 20px;
}
.chapter-promise {
  font-size: 1.12rem; line-height: 1.62; color: var(--color-ink); margin: 0 0 28px;
  max-width: 46rem;
}

.chapter-outline {
  position: sticky;
  top: 68px;
  z-index: 30;
  align-self: start;
  background: var(--color-paper);
  border-right: 1px solid var(--color-line);
  padding: 16px 20px 28px 0;
  max-height: calc(100vh - 68px);
  overflow-y: auto;
}
.outline-progress {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--color-muted);
  letter-spacing: 0.04em; margin: 0 0 14px;
}
.outline-heading {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.08rem; letter-spacing: -0.02em; margin: 0 0 16px;
}
.outline-group { margin: 0 0 18px; }
.outline-group:last-child { margin-bottom: 0; }
.outline-group-label { margin: 0 0 8px; }
.outline-group ul { list-style: none; margin: 0; padding: 0; }
.outline-group li { margin: 0; }
.outline-group a {
  display: flex; align-items: baseline; justify-content: space-between; gap: 8px;
  padding: 5px 0 5px 10px;
  border-left: 2px solid transparent;
  font-size: 13.5px; line-height: 1.35; color: var(--color-muted);
}
.outline-group a:hover { color: var(--color-ink); }
.outline-group a.is-active {
  color: var(--color-pine); border-left-color: var(--color-pine); font-weight: 600;
}
.outline-done {
  font-family: var(--font-mono); font-size: 12px; color: var(--color-pine); flex: none;
}


.chapter-rail {
  position: sticky;
  top: 84px;
  align-self: start;
  display: none;
}
@media (min-width: 1080px) {
  .chapter-rail { display: block; }
}
.chapter-rail .spec { margin: 0 0 14px; }
.rail-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.rail-card {
  display: flex; flex-direction: column; gap: 6px;
  padding: 16px 18px;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 16px;
  box-shadow: var(--sh-sm);
  transition: border-color 0.18s, transform 0.14s var(--ease), box-shadow 0.18s;
}
.rail-card:hover {
  border-color: var(--color-pine-tint);
  transform: translateY(-1px);
  box-shadow: var(--sh-md);
}
.rail-card.is-done { border-color: var(--color-pine-tint); background: var(--color-pine-wash); }
.rail-kicker {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-pine);
}
.rail-title {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.15rem; letter-spacing: -0.02em; line-height: 1.2;
  color: var(--color-ink);
}
.rail-meta {
  font-family: var(--font-mono); font-size: 12px; color: var(--color-muted);
  letter-spacing: 0.02em;
}
.rail-skip {
  display: inline-block; margin-top: 16px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 600;
  color: var(--color-pine);
}
.rail-skip:hover { color: var(--color-pine-deep); }

.chapter-outline-mobile {
  margin: 0 0 24px;
  padding: 10px 16px 12px;
  border: 1px solid var(--color-line);
  border-radius: 12px;
  background: var(--color-card);
}
.chapter-outline-mobile summary {
  cursor: pointer; list-style: none;
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.05rem; letter-spacing: -0.02em;
  padding: 6px 0;
}
.chapter-outline-mobile summary::-webkit-details-marker { display: none; }
.chapter-outline-mobile[open] summary { margin-bottom: 10px; }
.chapter-outline-mobile .outline-progress { margin-top: 4px; }


.chapter-kit {
  margin: 0 0 28px;
  padding: 18px 20px 16px;
  background: var(--color-pine-wash);
  border: 1px solid var(--color-pine-tint);
  border-radius: 16px;
}
.chapter-kit-title {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.2rem; letter-spacing: -0.02em;
  margin: 0 0 6px;
}
.chapter-kit-lede {
  font-size: 14.5px; color: var(--color-muted);
  margin: 0 0 16px;
}
.kit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 28px;
  margin: 0;
}
@media (min-width: 900px) {
  .kit-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .kit-grid { grid-template-columns: 1fr; }
}
.kit-grid dt {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-pine); margin: 0 0 6px;
}
.kit-grid dd { margin: 0; font-size: 14.5px; line-height: 1.4; color: var(--color-ink); }
.kit-grid ul { list-style: none; margin: 0; padding: 0; }
.kit-grid li { margin: 0 0 4px; }
.kit-grid li:last-child { margin-bottom: 0; }

.workflow-kit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px 16px;
  margin: 4px 0 8px;
  padding: 14px 0 16px;
  border-bottom: 1px dashed var(--color-line-2);
}
.workflow-kit dt {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--color-pine); margin: 0 0 4px;
}
.workflow-kit dd {
  margin: 0; font-size: 14px; line-height: 1.4; color: var(--color-ink);
}

.rail-kit {
  font-size: 12.5px; line-height: 1.35; color: var(--color-muted);
}
.rail-out { color: var(--color-ink); }

.chapter-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 40px;
  margin: 0 0 8px;
  padding: 18px 0 6px;
  border-top: 1px solid var(--color-line);
}
.chapter-map-title { grid-column: 1 / -1; }
@media (max-width: 720px) {
  .chapter-map { grid-template-columns: 1fr; }
}
.chapter-map-title {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.2rem; letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.chapter-map-block { margin: 0 0 16px; }
.chapter-map-block .spec { margin: 0 0 8px; }
.chapter-map-block ul { margin: 0; padding: 0 0 0 1.1em; }
.chapter-map-block li { margin: 0 0 6px; }
.chapter-map-block a { color: var(--color-pine); font-weight: 600; }
.chapter-map-block a:hover { color: var(--color-pine-deep); }

.skip-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  margin: 0 0 48px; padding: 16px 0;
  border-top: 1px dashed var(--color-line-2);
  border-bottom: 1px dashed var(--color-line-2);
}
.skip-label {
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-pine);
  margin-right: 4px;
}
.skip-chip {
  display: inline-flex; align-items: baseline; gap: 8px;
  font-family: var(--font-mono); font-size: 12.5px; color: var(--color-pine);
  background: var(--color-pine-wash); border: 1px solid var(--color-pine-tint);
  padding: 7px 13px; border-radius: 999px;
  transition: background 0.18s, transform 0.14s var(--ease);
}
.skip-chip:hover { background: var(--color-pine-tint); transform: translateY(-1px); }
.skip-chip:focus-visible { outline: 2px solid var(--color-pine); outline-offset: 3px; }
.skip-chip-job {
  font-family: var(--font-body); font-size: 13px; font-weight: 600;
  color: var(--color-ink); letter-spacing: 0; text-transform: none;
}

.essay,
.recipe-nested,
.end-matter,
.end-sources,
.recipe-nested .row {
  scroll-margin-top: 88px;
}

.essay { margin: 0 0 36px; max-width: 46rem; }
.essay h2 {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.45rem; letter-spacing: -0.02em; line-height: 1.2;
  margin: 0 0 12px;
}
.essay p { color: var(--color-ink); margin: 0 0 14px; }
.essay p:last-child { margin-bottom: 0; }

.workflow-kicker { margin: 8px 0 10px; }

.recipe-nested {
  margin: 0 0 52px;
}
.recipe-nested .step-copy { min-width: 0; flex: 1; }
.recipe-nested .step-copy .term { margin-top: 12px; }
.recipe-nested h4.k { margin: 0; font-weight: 500; }
.recipe-nested .term {
  overflow-x: auto;
  overflow-y: hidden;
}
.recipe-nested .term pre { overflow-x: auto; }

.recipe-jump {
  display: flex; flex-wrap: wrap; gap: 8px 16px;
  margin: 0 0 8px; padding: 0 0 16px;
  border-bottom: 1px dashed var(--color-line-2);
  font-size: 13.5px;
}
.recipe-jump a { color: var(--color-pine); font-weight: 600; }
.recipe-jump a:hover { color: var(--color-pine-deep); }
.recipe-jump a:focus-visible { outline: 2px solid var(--color-pine); outline-offset: 2px; }

.plain-list { margin: 0; padding: 0 0 0 1.1em; }
.plain-list li { margin: 0 0 6px; }
.plain-list li:last-child { margin-bottom: 0; }

.evidence-p { margin: 0 0 10px; }
.evidence-p:last-child { margin-bottom: 0; }
.sub-line { color: var(--color-muted); font-size: 14.5px; margin: 8px 0 12px; }
.inline-sample {
  font-family: var(--font-mono); font-size: 13px; color: var(--color-pine);
  border-bottom: 1px solid var(--color-pine-tint);
}
.inline-sample:hover { color: var(--color-pine-deep); }

.tryit-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.tryit-actions .btn { font-size: 14px; padding: 11px 18px; }
.tryit-done { gap: 8px; }
.recipe-record {
  display: flex; flex-direction: column; gap: 6px;
  font-size: 14.5px; color: var(--color-muted);
}
.recipe-record a { color: var(--color-pine); font-weight: 600; }
.recipe-record a:hover { color: var(--color-pine-deep); }

.end-matter {
  margin-top: 56px; padding-top: 28px;
  border-top: 1px solid var(--color-line);
}
.end-sources { margin-top: 32px; }
.end-matter h2,
.end-sources h2 {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.35rem; letter-spacing: -0.02em; margin: 0 0 12px;
}
.end-matter h2 + .further-list { margin-bottom: 8px; }
.further-list { margin: 0 0 8px; padding: 0 0 0 1.1em; color: var(--color-ink); }
.further-list li { margin: 0 0 8px; }
.further-list a { color: var(--color-pine); font-weight: 600; }
.chapter-updated {
  font-family: var(--font-mono); font-size: 12px; color: var(--color-muted);
  letter-spacing: 0.04em; margin-top: 18px;
}

.library-title {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(1.9rem, 4vw, 3rem); letter-spacing: -0.025em;
  line-height: 1.15; margin: 14px 0 16px;
  white-space: nowrap;
}
.library-lede { color: var(--color-muted); max-width: 38rem; margin-bottom: 34px; }

.toc .toc-soon {
  display: grid; grid-template-columns: 52px 1fr auto auto;
  align-items: center; gap: 20px; padding: 22px 8px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
}
.toc .soon {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--color-muted);
  background: var(--color-card); border: 1px solid var(--color-line);
  padding: 4px 10px; border-radius: 999px; white-space: nowrap;
}
.reader-library .toc a {
  grid-template-columns: 52px 1fr auto auto auto;
}
.toc-count {
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--color-pine); white-space: nowrap;
}
@media (max-width: 720px) {
  .toc .toc-soon .desc { display: none; }
  .toc .toc-soon { grid-template-columns: 40px 1fr auto; }
  .reader-library .toc a { grid-template-columns: 40px 1fr auto auto; }
}

.recipe-focus-page { padding: 40px 0 96px; }
.recipe-focus-page .demo-chip { margin-bottom: 12px; }
.recipe-focus-page .recipe { max-width: none; }
.focus-back {
  font-family: var(--font-mono); font-size: 13px; color: var(--color-muted);
  margin: 0 0 28px;
}
.focus-back a { color: var(--color-pine); font-weight: 600; }

@media (max-width: 959px) {
  .chapter-shell { grid-template-columns: 1fr; gap: 0; }
  .chapter-outline { display: none; }
  .chapter-rail { display: none; }
}
@media (min-width: 960px) {
  .chapter-outline-mobile { display: none; }
}

@media print {
  .reader-nav, .chapter-outline, .chapter-outline-mobile, .chapter-rail, .reader-footer, .skip-row, .tryit-actions, .demo-chip, .recipe-jump {
    display: none !important;
  }
  .recipe-nested { break-inside: avoid; box-shadow: none; }
}