/* CARBONE ZERO — main stylesheet. All values reference tokens.css. */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

::selection { background: var(--leaf); color: var(--ink); }

.wrap { max-width: var(--max-w); margin-inline: auto; padding-inline: var(--gutter); }

/* ---------- Typography ---------- */
h1, h2, h3 { font-family: var(--font-display); font-weight: 560; line-height: 1.05; letter-spacing: -0.015em; }
h1 { font-size: var(--text-hero); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-lg); line-height: 1.25; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--leaf-deep);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}
.eyebrow::before { content: ""; width: 1.75rem; height: 1px; background: var(--leaf-deep); }

.lede { font-size: var(--text-lg); line-height: 1.45; color: var(--ink-2); max-width: 38ch; }
.muted { color: var(--ink-muted); }
.mono { font-family: var(--font-mono); }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset-inline: 0; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--paper) 82%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-med) var(--ease-out), background var(--dur-med) var(--ease-out);
}
.site-header.scrolled { border-bottom-color: var(--line); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 4.25rem;
}
.brand {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-display); font-weight: 600; font-size: 1.2rem;
  letter-spacing: 0.01em; text-decoration: none;
}
.brand svg { width: 1.6rem; height: 1.6rem; }
.brand .brand-tag { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.22em; color: var(--leaf-deep); align-self: end; margin-bottom: 0.18rem; }

.nav { display: flex; align-items: center; gap: var(--space-md); }
.nav a {
  text-decoration: none; font-size: var(--text-sm); color: var(--ink-2);
  padding: 0.35rem 0; position: relative;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1.5px; width: 100%;
  background: var(--leaf-deep); transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}
.nav a:hover, .nav a:focus-visible { color: var(--ink); }
.nav a:hover::after, .nav a:focus-visible::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--ink); }

.nav-toggle { display: none; }

/* ---------- Buttons: all states ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 600;
  padding: 0.8rem 1.5rem; border-radius: var(--radius-pill);
  text-decoration: none; border: 1px solid var(--ink); cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.btn-primary { background: var(--ink); color: var(--paper-on-ink); }
.btn-primary:hover { background: var(--ink-2); transform: translateY(-2px); box-shadow: 0 8px 20px -8px var(--ink); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--sand); transform: translateY(-2px); }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--leaf-deep); outline-offset: 3px;
}
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }
.btn.is-loading { pointer-events: none; }
.btn.is-loading .btn-label { visibility: hidden; }
.btn .btn-arrow { transition: transform var(--dur-fast) var(--ease-out); }
.btn:hover .btn-arrow { transform: translateX(3px); }

.on-ink .btn-primary { background: var(--leaf); border-color: var(--leaf); color: var(--ink); }
.on-ink .btn-primary:hover { background: var(--paper-on-ink); border-color: var(--paper-on-ink); box-shadow: none; }
.on-ink .btn-ghost { color: var(--paper-on-ink); border-color: var(--line-dark); }
.on-ink .btn-ghost:hover { background: var(--ink-2); }

/* ---------- Hero ---------- */
.hero {
  position: relative; padding-top: clamp(8rem, 6rem + 8vh, 12rem);
  padding-bottom: var(--space-2xl);
  overflow: clip; isolation: isolate;
}
.hero-atmo {
  position: absolute; inset: 0; z-index: -2;
  background:
    radial-gradient(58rem 34rem at 12% -8%, color-mix(in oklab, var(--leaf) 16%, transparent), transparent 62%),
    radial-gradient(42rem 30rem at 96% 4%, color-mix(in oklab, var(--sand) 60%, transparent), transparent 68%),
    var(--paper);
}
.hero-contours {
  position: absolute; inset: 0; z-index: -1; opacity: 0.5;
  color: var(--line); pointer-events: none;
}
.grain::after {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.035 0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { max-width: 13ch; }
.hero h1 em { font-style: italic; color: var(--leaf-deep); }
.hero .lede { margin-top: var(--space-md); }
.hero-ctas { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-lg); }
.hero-note { margin-top: var(--space-md); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--ink-muted); }

/* Page hero (subpages) */
.page-hero { padding-top: clamp(7.5rem, 6rem + 6vh, 10rem); padding-bottom: var(--space-xl); position: relative; overflow: clip; }
.page-hero h1 { font-size: var(--text-2xl); max-width: 16ch; }
.page-hero .lede { margin-top: var(--space-md); max-width: 52ch; }

/* ---------- Ticker ---------- */
.ticker { border-block: 1px solid var(--line); background: var(--paper-2); overflow: hidden; }
.ticker-track {
  display: flex; width: max-content; gap: 0;
  animation: ticker 46s linear infinite;
}
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker-item {
  display: inline-flex; align-items: baseline; gap: 0.55rem;
  padding: 0.85rem 1.6rem; white-space: nowrap;
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.06em;
  border-right: 1px solid var(--line);
}
.ticker-item b { color: var(--leaf-deep); font-weight: 700; }
@keyframes ticker { to { transform: translateX(-50%); } }

/* ---------- Sections ---------- */
.section { padding-block: var(--space-2xl); }
.section-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--space-md); margin-bottom: var(--space-xl); }
.section-head h2 { max-width: 18ch; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-md) var(--space-md);
  display: flex; flex-direction: column; gap: var(--space-sm);
  transition: transform var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out);
}
.card:hover { transform: translateY(-4px); border-color: var(--leaf-deep); box-shadow: 0 18px 34px -24px var(--ink); }
.card .card-index { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--leaf-deep); letter-spacing: 0.14em; }
.card p { font-size: var(--text-sm); color: var(--ink-muted); }
.card .card-more { margin-top: auto; font-size: var(--text-sm); font-weight: 600; text-decoration: none; color: var(--leaf-deep); }
.card .card-more:hover { text-decoration: underline; }

/* ---------- Stat band ---------- */
.band-ink { background: var(--ink); color: var(--paper-on-ink); position: relative; overflow: clip; }
.band-ink .eyebrow { color: var(--leaf); }
.band-ink .eyebrow::before { background: var(--leaf); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); margin-top: var(--space-xl); }
.stat { border-top: 1px solid var(--line-dark); padding-top: var(--space-sm); }
.stat-value { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 560; letter-spacing: -0.01em; }
.stat-value sup { font-size: 0.45em; margin-left: 0.1em; }
.stat-label { margin-top: var(--space-2xs); font-size: var(--text-sm); color: color-mix(in oklab, var(--paper-on-ink) 72%, var(--ink)); }
.band-foot { margin-top: var(--space-xl); font-family: var(--font-mono); font-size: var(--text-xs); color: color-mix(in oklab, var(--paper-on-ink) 55%, var(--ink)); max-width: 64ch; }

/* ---------- Ledger (one credit = one tonne) ---------- */
.ledger { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-2xl); align-items: start; }
.ledger-statement { font-family: var(--font-display); font-size: var(--text-xl); line-height: 1.2; letter-spacing: -0.01em; max-width: 20ch; }
.ledger-statement em { font-style: italic; color: var(--leaf-deep); }
.chain { list-style: none; counter-reset: step; }
.chain li {
  counter-increment: step; position: relative;
  padding: var(--space-md) 0 var(--space-md) 3.4rem; border-top: 1px solid var(--line);
}
.chain li:last-child { border-bottom: 1px solid var(--line); }
.chain li::before {
  content: "0" counter(step); position: absolute; left: 0; top: var(--space-md);
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--leaf-deep); letter-spacing: 0.1em;
}
.chain h3 { font-size: var(--text-base); font-family: var(--font-body); font-weight: 700; }
.chain p { font-size: var(--text-sm); color: var(--ink-muted); margin-top: var(--space-2xs); }

/* ---------- Market rows ---------- */
.rows { border-top: 1px solid var(--line); }
.row {
  display: grid; grid-template-columns: 7rem 1fr 1.3fr auto; gap: var(--space-md);
  align-items: center; padding: var(--space-md) 0; border-bottom: 1px solid var(--line);
  text-decoration: none; position: relative;
  transition: background var(--dur-fast) var(--ease-out), padding-left var(--dur-med) var(--ease-out);
}
a.row:hover { background: color-mix(in oklab, var(--sand) 40%, transparent); padding-left: var(--space-sm); }
.row-code { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.12em; color: var(--leaf-deep); }
.row-name { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 560; line-height: 1.15; }
.row-desc { font-size: var(--text-sm); color: var(--ink-muted); }
.row-arrow { font-size: 1.2rem; color: var(--leaf-deep); transition: transform var(--dur-fast) var(--ease-out); }
a.row:hover .row-arrow { transform: translateX(4px); }

/* Market detail blocks (markets page) */
.market { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: var(--space-xl); padding-block: var(--space-xl); border-top: 1px solid var(--line); }
.market:first-of-type { border-top: 0; }
.market-meta .row-code { display: block; margin-bottom: var(--space-xs); }
.market-meta h2 { font-size: var(--text-xl); max-width: 14ch; }
.market-meta .mono { display: block; margin-top: var(--space-sm); font-size: var(--text-xs); color: var(--ink-muted); line-height: 1.9; }
.market-body p + p { margin-top: var(--space-sm); }
.market-body p { color: var(--ink-2); }
.market-body .fact {
  margin-top: var(--space-md); padding: var(--space-sm) var(--space-md);
  border-left: 2px solid var(--leaf); background: var(--paper-2); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: var(--text-sm); color: var(--ink-2);
}

/* ---------- Split editorial ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); align-items: start; }
.split .sticky { position: sticky; top: 6.5rem; }
.prose p + p { margin-top: var(--space-sm); }
.prose p { color: var(--ink-2); }
.prose strong { color: var(--ink); }

/* Entity cards (about) */
.entity-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.entity {
  border: 1px solid var(--line); border-radius: var(--radius-md); padding: var(--space-md);
  background: var(--paper);
}
.entity .row-code { display: block; margin-bottom: var(--space-sm); }
.entity h3 { font-family: var(--font-display); }
.entity address { font-style: normal; font-size: var(--text-sm); color: var(--ink-muted); margin-top: var(--space-xs); line-height: 1.7; }
.entity .entity-role { margin-top: var(--space-sm); font-size: var(--text-sm); color: var(--ink-2); }

/* Levers (services) */
.lever { display: grid; grid-template-columns: 4.5rem 1fr; gap: var(--space-md); padding-block: var(--space-lg); border-top: 1px solid var(--line); }
.lever-num { font-family: var(--font-display); font-size: var(--text-xl); font-style: italic; color: var(--leaf-deep); line-height: 1; }
.lever h3 { margin-bottom: var(--space-xs); }
.lever p { color: var(--ink-muted); font-size: var(--text-sm); max-width: 62ch; }

/* ---------- CTA band ---------- */
.cta-band { text-align: left; }
.cta-band h2 { max-width: 16ch; }
.cta-band .hero-ctas { margin-top: var(--space-lg); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); }
.contact-list { list-style: none; }
.contact-list li { padding: var(--space-md) 0; border-bottom: 1px solid var(--line); }
.contact-list .mono { font-size: var(--text-xs); color: var(--leaf-deep); letter-spacing: 0.12em; text-transform: uppercase; display: block; margin-bottom: var(--space-2xs); }
.contact-list a { font-family: var(--font-display); font-size: var(--text-lg); text-decoration: none; }
.contact-list a:hover { color: var(--leaf-deep); }
.contact-list address { font-style: normal; color: var(--ink-2); line-height: 1.7; }

.field { display: flex; flex-direction: column; gap: var(--space-2xs); margin-bottom: var(--space-md); }
.field label { font-size: var(--text-sm); font-weight: 600; }
.field input, .field textarea {
  font: inherit; color: var(--ink); background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.field input:hover, .field textarea:hover { border-color: var(--ink-muted); }
.field input:focus, .field textarea:focus { border-color: var(--leaf-deep); outline: none; box-shadow: 0 0 0 3px color-mix(in oklab, var(--leaf) 25%, transparent); }
.field input:disabled, .field textarea:disabled { background: var(--paper-2); opacity: 0.6; }
.field .hint { font-size: var(--text-xs); color: var(--ink-muted); }
.field.has-error input, .field.has-error textarea { border-color: oklch(55% 0.19 25); }
.field .error-msg { display: none; font-size: var(--text-xs); color: oklch(48% 0.18 25); }
.field.has-error .error-msg { display: block; }
.form-success {
  display: none; padding: var(--space-sm) var(--space-md); border-radius: var(--radius-sm);
  background: color-mix(in oklab, var(--leaf) 18%, var(--paper)); border: 1px solid var(--leaf-deep);
  font-size: var(--text-sm); margin-bottom: var(--space-md);
}
.form-success.visible { display: block; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: var(--paper-on-ink); padding-block: var(--space-2xl) var(--space-lg); margin-top: var(--space-2xl); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: var(--space-xl); }
.footer-brand { font-family: var(--font-display); font-size: var(--text-lg); }
.footer-brand img { width: 5.5rem; margin-bottom: var(--space-sm); background: var(--paper); border-radius: var(--radius-sm); padding: 0.4rem; }
.footer-col h4 { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase; color: var(--leaf); margin-bottom: var(--space-sm); font-weight: 500; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: var(--space-xs); }
.footer-col a { color: color-mix(in oklab, var(--paper-on-ink) 80%, var(--ink)); text-decoration: none; font-size: var(--text-sm); }
.footer-col a:hover { color: var(--paper-on-ink); text-decoration: underline; }
.footer-col address, .footer-col p { font-style: normal; font-size: var(--text-sm); color: color-mix(in oklab, var(--paper-on-ink) 72%, var(--ink)); line-height: 1.8; }
.footer-legal {
  margin-top: var(--space-xl); padding-top: var(--space-md); border-top: 1px solid var(--line-dark);
  display: flex; flex-wrap: wrap; gap: var(--space-sm); justify-content: space-between;
  font-family: var(--font-mono); font-size: var(--text-xs); color: color-mix(in oklab, var(--paper-on-ink) 55%, var(--ink));
}

/* ---------- Reveal animations ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); transition-delay: var(--d, 0ms); }
.reveal.in { opacity: 1; transform: none; }

.hero [data-stagger] { opacity: 0; transform: translateY(26px); animation: rise var(--dur-slow) var(--ease-out) forwards; animation-delay: var(--d, 0ms); }
@keyframes rise { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .hero [data-stagger] { opacity: 1; transform: none; animation: none; transition: opacity 150ms linear; }
  .ticker-track { animation: none; }
  .btn, .card, .row { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .card-grid, .entity-grid { grid-template-columns: 1fr 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; gap: var(--space-md); }
  .ledger, .split, .contact-grid, .market { grid-template-columns: 1fr; gap: var(--space-lg); }
  .split .sticky { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
  .row { grid-template-columns: 5rem 1fr auto; }
  .row-desc { display: none; }
}

@media (max-width: 640px) {
  .card-grid, .entity-grid, .stat-grid, .footer-grid { grid-template-columns: 1fr; }
  .nav {
    position: fixed; inset: 4.25rem 0 auto 0; z-index: 40;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: var(--space-sm) var(--gutter) var(--space-md);
    transform: translateY(-115%); transition: transform var(--dur-med) var(--ease-out);
  }
  .nav.open { transform: none; }
  .nav a { padding: 0.7rem 0; font-size: var(--text-base); width: 100%; }
  .nav .btn { margin-top: var(--space-sm); }
  .nav-toggle {
    display: inline-flex; flex-direction: column; gap: 5px;
    background: none; border: 0; padding: 0.5rem; cursor: pointer;
  }
  .nav-toggle span { width: 22px; height: 2px; background: var(--ink); transition: transform var(--dur-med) var(--ease-out), opacity var(--dur-fast); }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .row { grid-template-columns: 1fr auto; }
  .row-code { grid-column: 1 / -1; }
  .lever { grid-template-columns: 1fr; gap: var(--space-xs); }
}