/*
 * aicookbook.io marketing pages. Self-contained (no build): tokens are
 * plujo.com's (docs/brand.md), type is Instrument Sans display + Inter body.
 * Mobile first; one breakpoint for the nav at 60rem.
 */
:root {
    --teal: #63c3a5; --green: #3d9e80; --green-ink: #26705a; --green-dark: #1a4a38;
    --forest: #0f2e20; --forest-deep: #0a2318;
    --amber: #f4a24d; --amber-deep: #e08e35; --amber-edge: #a9631a;
    --cream: #f5f0e8; --cream-dark: #ece5d9; --cream-line: #ddd3c3; --rule-strong: #867c6b;
    --ink: #1a2a22; --ink-soft: #3d5047; --mist: #9db3a8;
    --display: 'Instrument Sans', Inter, ui-sans-serif, system-ui, sans-serif;
    --sans: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
    --shadow-raise: 0 1px 2px rgba(15, 46, 32, .05), 0 6px 16px -8px rgba(15, 46, 32, .1);
    --shadow-lift: 0 2px 4px rgba(15, 46, 32, .06), 0 18px 40px -16px rgba(15, 46, 32, .18);
    --wrap: 72rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--cream); color: var(--ink); font: 400 1rem/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--display); font-weight: 600; letter-spacing: -.028em; line-height: 1.08; margin: 0 0 .9rem; text-wrap: balance; }
h1 { font-size: clamp(2.3rem, 6.4vw, 4.4rem); }
h2 { font-size: clamp(1.85rem, 4.2vw, 3rem); }
h3 { font-size: 1.2rem; letter-spacing: -.018em; line-height: 1.25; margin-bottom: .5rem; }
p { margin: 0 0 1rem; }
.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 1rem; z-index: 50; background: var(--forest); color: var(--cream); padding: .6rem 1rem; border-radius: 999px; }
.skip:focus { left: 1rem; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }

/* Grounds */
.on-forest { background: radial-gradient(130% 100% at 15% -8%, #143a28 0%, #0f2e20 55%, #0a2318 100%); color: var(--cream); box-shadow: inset 0 1px 0 rgba(99, 195, 165, .18); }
.on-forest .lede, .on-forest p { color: rgba(245, 240, 232, .82); }
.on-forest .muted { color: var(--mist); }
.drafting { position: relative; }
.drafting::before { content: ''; position: absolute; inset: 0; pointer-events: none;
    background-image: linear-gradient(rgba(99, 195, 165, .10) 1px, transparent 1px), linear-gradient(90deg, rgba(99, 195, 165, .10) 1px, transparent 1px),
        linear-gradient(rgba(99, 195, 165, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(99, 195, 165, .05) 1px, transparent 1px);
    background-size: 80px 80px, 80px 80px, 20px 20px, 20px 20px; }
.drafting > * { position: relative; }
.on-cream-dark { background: var(--cream-dark); }
.section { padding: clamp(3.5rem, 9vw, 6.5rem) 0; }

/* Type helpers */
.eyebrow { display: inline-flex; align-items: center; gap: .5rem; font-size: .75rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--green-ink); margin-bottom: 1rem; }
.eyebrow::before { content: ''; width: .6rem; height: .6rem; border-radius: 2px; background: var(--amber); box-shadow: inset 0 0 0 1px var(--amber-edge); }
.on-forest .eyebrow { color: var(--teal); }
.on-forest .eyebrow::before { box-shadow: none; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.2rem); color: var(--ink-soft); max-width: 40rem; }
.muted { color: var(--ink-soft); }
.small { font-size: .875rem; }
.kicker { font-family: var(--display); font-weight: 600; font-size: clamp(1.2rem, 2.4vw, 1.55rem); letter-spacing: -.02em; line-height: 1.3; max-width: 44rem; margin-top: 2.5rem; }

/* Buttons: amber with ink text (7.2:1), rimmed on light grounds. */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 3rem; padding: .75rem 1.35rem; border-radius: 999px; font-weight: 600; font-size: .95rem; text-decoration: none; border: 1px solid transparent; transition: background .15s, transform .15s; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--amber); color: var(--ink); border-color: var(--amber-edge); }
.btn-primary:hover { background: #f7b56e; }
.on-forest .btn-primary { border-color: var(--amber); }
.btn-ghost { color: var(--ink); border-color: var(--rule-strong); }
.btn-ghost:hover { background: rgba(15, 46, 32, .05); }
.on-forest .btn-ghost { color: var(--cream); border-color: rgba(245, 240, 232, .45); }
.on-forest .btn-ghost:hover { background: rgba(245, 240, 232, .08); }
.btn-sm { min-height: 2.5rem; padding: .5rem 1rem; font-size: .875rem; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.75rem 0 1rem; }
@media (max-width: 30rem) { .actions .btn { width: 100%; } }

/* Nav: forest, sticky; <details> menu on mobile, no JS. */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(15, 46, 32, .95); backdrop-filter: blur(8px); color: var(--cream); border-bottom: 1px solid rgba(99, 195, 165, .15); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4.25rem; }
.nav-home { text-decoration: none; display: inline-flex; }
.nav-links { display: none; align-items: center; gap: 1.6rem; font-size: .9rem; }
.nav-links a { text-decoration: none; color: rgba(245, 240, 232, .85); }
.nav-links a:hover { color: var(--cream); }
.nav-links .btn { color: var(--ink); }
.nav-menu summary { list-style: none; cursor: pointer; padding: .5rem .75rem; border: 1px solid rgba(245, 240, 232, .35); border-radius: 999px; font-size: .875rem; font-weight: 600; }
.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu[open] summary { background: rgba(245, 240, 232, .1); }
.nav-menu-panel { position: absolute; left: 0; right: 0; top: 100%; background: var(--forest); border-bottom: 1px solid rgba(99, 195, 165, .2); padding: 1rem 16px 1.5rem; display: grid; gap: .25rem; }
.nav-menu-panel a { text-decoration: none; padding: .7rem 0; border-bottom: 1px solid rgba(245, 240, 232, .1); color: var(--cream); }
.nav-menu-panel .btn { margin-top: 1rem; border-bottom: 0; color: var(--ink); }
@media (min-width: 60rem) { .nav-links { display: flex; } .nav-menu { display: none; } }

/* Hero */
.hero { padding: clamp(3rem, 8vw, 6rem) 0 clamp(3.5rem, 8vw, 6rem); }
.hero-grid { display: grid; gap: 3rem; align-items: center; }
@media (min-width: 60rem) { .hero-grid { grid-template-columns: 1.25fr 1fr; } }
.hero .note { font-size: .9rem; }

/* Product sketch in the hero: a quadrant board and a recipe card. */
.sketch { background: rgba(10, 35, 24, .55); border: 1px solid rgba(99, 195, 165, .25); border-radius: 14px; padding: 1.25rem; box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .5); }
.sketch-head { display: flex; justify-content: space-between; font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; color: var(--mist); margin-bottom: .9rem; }
.quad { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.quad div { border-radius: 4px; padding: .85rem .8rem; min-height: 5.2rem; display: flex; flex-direction: column; justify-content: space-between; font-size: .8rem; }
.quad b { font-family: var(--display); font-weight: 600; font-size: 1rem; letter-spacing: -.01em; }
.q-k { background: var(--teal); color: var(--ink); }
.q-s { background: var(--green-dark); color: var(--cream); border: 1px solid rgba(99, 195, 165, .35); }
.q-j { background: var(--green); color: var(--ink); }
.q-c { border: 2px dashed rgba(99, 195, 165, .6); color: var(--cream); }
.recipe { margin-top: .9rem; background: var(--cream); color: var(--ink); border-radius: 8px; padding: .85rem 1rem; font-size: .85rem; box-shadow: var(--shadow-lift); }
.recipe-row { display: flex; justify-content: space-between; gap: 1rem; padding: .3rem 0; border-top: 1px solid var(--cream-line); }
.recipe-row:first-of-type { border-top: 0; }
.pill { display: inline-block; font-size: .72rem; font-weight: 600; border-radius: 999px; padding: .1rem .55rem; background: #fdebd5; color: #6b3f14; white-space: nowrap; }
.pill-ok { background: #d8f1e8; color: #1f5c4a; }

/* Proof strip */
.strip { display: grid; gap: 1px; background: rgba(99, 195, 165, .2); border-block: 1px solid rgba(99, 195, 165, .2); }
.strip p { margin: 0; background: var(--forest-deep); padding: 1.1rem 16px; color: var(--cream); font-weight: 500; text-align: center; }
@media (min-width: 48rem) { .strip { grid-template-columns: repeat(3, 1fr); } }

/* Cards */
.grid-3, .grid-4 { display: grid; gap: 1rem; margin-top: 2.25rem; }
@media (min-width: 48rem) { .grid-3 { grid-template-columns: repeat(3, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 72rem) { .grid-4 { grid-template-columns: repeat(4, 1fr); } }
.card { background: #fffdf9; border: 1px solid var(--cream-line); border-radius: 12px; padding: 1.4rem 1.35rem; box-shadow: var(--shadow-raise); }
.card p { color: var(--ink-soft); margin: 0; }
.card .label { display: block; font-size: .72rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--green-ink); margin-bottom: .65rem; }
.card .outcome { margin-top: .9rem; padding-top: .8rem; border-top: 1px solid var(--cream-line); font-size: .875rem; color: var(--ink); }
.on-forest .card { background: rgba(26, 74, 56, .55); border-color: rgba(99, 195, 165, .22); box-shadow: none; }
.on-forest .card p { color: rgba(245, 240, 232, .8); }
.on-forest .card .label { color: var(--teal); }

/* Recipe flow: ingredients -> method -> human control */
.flow { display: grid; gap: .75rem; margin-top: 2.25rem; align-items: stretch; }
.flow .arrow { display: none; align-self: center; color: var(--amber-edge); font-size: 1.4rem; text-align: center; }
@media (min-width: 60rem) { .flow { grid-template-columns: 1fr auto 1fr auto 1fr; } .flow .arrow { display: block; } }

/* Quadrants */
.quadrant-card { position: relative; padding-top: 3.1rem; }
.quadrant-card .qmark { position: absolute; top: 1.3rem; left: 1.35rem; display: grid; grid-template-columns: repeat(2, .55rem); gap: 2px; }
.quadrant-card .qmark i { width: .55rem; height: .55rem; border-radius: 1px; border: 1px solid var(--rule-strong); }
.quadrant-card .qmark i.on { background: var(--green); border-color: var(--green); }
.on-forest .quadrant-card .qmark i { border-color: rgba(99, 195, 165, .6); }
.on-forest .quadrant-card .qmark i.on { background: var(--teal); border-color: var(--teal); }
.axes { display: grid; gap: .5rem; margin-top: 1.5rem; font-size: .9rem; }
@media (min-width: 48rem) { .axes { grid-template-columns: 1fr 1fr; } }

/* Ownership */
.own { display: grid; gap: 2rem; align-items: start; }
@media (min-width: 60rem) { .own { grid-template-columns: 1fr 1fr; gap: 4rem; } }
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: .8rem; }
.checks li { position: relative; padding-left: 1.8rem; }
.checks li::before { content: ''; position: absolute; left: 0; top: .35rem; width: 1rem; height: 1rem; border-radius: 3px; background: var(--green); box-shadow: inset 0 0 0 1px var(--green-ink); }
.checks li::after { content: ''; position: absolute; left: .33rem; top: .5rem; width: .3rem; height: .55rem; border: solid var(--cream); border-width: 0 2px 2px 0; transform: rotate(45deg); }
.quote { font-family: var(--display); font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 600; letter-spacing: -.025em; line-height: 1.2; border-left: 4px solid var(--amber); padding-left: 1.2rem; margin: 0 0 1.5rem; }

/* Early access */
.offer { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 60rem) { .offer { grid-template-columns: 1.2fr 1fr; gap: 4rem; } }
.offer .card { padding: 1.75rem; }

/* FAQ */
.faq { max-width: 48rem; margin-top: 2rem; border-top: 1px solid var(--rule-strong); }
.faq details { border-bottom: 1px solid var(--cream-line); padding: 1.05rem 0; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--green-ink); font-weight: 600; font-size: 1.25rem; line-height: 1; }
.faq details[open] summary::after { content: '\2212'; }
.faq details p { margin: .75rem 0 0; color: var(--ink-soft); }

/* Closing band + steps */
.steps { list-style: none; counter-reset: s; padding: 0; margin: 1.5rem 0 0; display: grid; gap: .6rem; }
.steps li { counter-increment: s; display: flex; gap: .8rem; align-items: baseline; }
.steps li::before { content: '0' counter(s); font-family: var(--display); font-weight: 600; color: var(--amber); }

/* Footer */
.footer { background: var(--forest-deep); color: var(--mist); padding: 2.5rem 0; font-size: .875rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; align-items: center; }
.footer a { color: var(--cream); }
.footer .endorse { display: inline-flex; align-items: center; gap: .6rem; text-decoration: none; }
.footer .endorse img { height: 1.35rem; width: auto; display: block; }
.footer nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }