/* cot.pages.pop.coop — COT (Chain of Trust)
   Papel e tinta: Newsreader (títulos), Inter (texto), IBM Plex Mono (dados). */

@font-face {
  font-family: "Newsreader";
  src: url("fonts/newsreader-latin-var.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Newsreader";
  src: url("fonts/newsreader-latin-var-italic.woff2") format("woff2");
  font-weight: 200 800;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("fonts/inter-latin-var.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-400-latin.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-500-latin.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #f4efe4;
  --paper-2: #ebe4d3;
  --ink: #1b1915;
  --ink-2: #4d483e;
  --rule: #cdc4af;
  --accent: #a8401f;
  --on-accent: #fff8ee;
  --net: #1d5a4c;

  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --gutter: clamp(16px, 4vw, 40px);
  --sec-pad: clamp(56px, 9vw, 112px);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #15140f;
    --paper-2: #1f1d16;
    --ink: #ece5d6;
    --ink-2: #aaa391;
    --rule: #3b372c;
    --accent: #e07a55;
    --on-accent: #1a120c;
    --net: #74c2ab;
  }
}

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

html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.62 var(--sans);
  font-feature-settings: "cv11", "ss03";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration-color: var(--accent); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: 1140px; margin-inline: auto; padding-inline: var(--gutter); }

.skip {
  position: absolute; left: var(--gutter); top: -60px;
  background: var(--ink); color: var(--paper); padding: 8px 14px; z-index: 10;
}
.skip:focus { top: 8px; }

/* ---------- topo ---------- */

.top {
  border-bottom: 1px solid var(--rule);
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.top .wrap { display: flex; align-items: center; gap: 28px; min-height: 56px; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 15px/1 var(--mono); letter-spacing: 0.14em; text-decoration: none;
}
.brand svg { width: 22px; height: 22px; color: var(--accent); }
.top nav { margin-left: auto; display: flex; gap: 22px; }
.top nav a {
  font-size: 14px; text-decoration: none; color: var(--ink-2);
}
.top nav a:hover { color: var(--ink); }
.top .ext {
  font: 500 13px/1 var(--mono); text-decoration: none;
  border: 1px solid var(--rule); padding: 8px 12px; border-radius: 3px; white-space: nowrap;
}
.top .ext:hover { border-color: var(--accent); }

@media (max-width: 860px) {
  .top nav { display: none; }
  .top .ext { margin-left: auto; }
}

/* ---------- tipografia compartilhada ---------- */

.eyebrow {
  font: 500 12.5px/1.4 var(--mono);
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent);
}

h1, h2 {
  font-family: var(--serif); font-weight: 500;
  letter-spacing: -0.018em; text-wrap: balance;
}
h1 { font-size: clamp(2.5rem, 6.2vw, 4.5rem); line-height: 1.02; }
h2 { font-size: clamp(1.9rem, 3.7vw, 2.9rem); line-height: 1.08; }
h3 { font: 600 1.08rem/1.35 var(--sans); letter-spacing: -0.005em; }

.lede { font-size: clamp(1.08rem, 1.5vw, 1.24rem); line-height: 1.55; color: var(--ink-2); text-wrap: pretty; }
p { text-wrap: pretty; }
.muted { color: var(--ink-2); }
.mono { font-family: var(--mono); font-size: 0.92em; }

/* ---------- hero ---------- */

.hero { padding-block: clamp(44px, 7vw, 96px) clamp(48px, 7vw, 88px); }
.hero .wrap {
  display: grid; gap: clamp(36px, 5vw, 72px);
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  align-items: center;
}
.hero h1 { margin-top: 20px; }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero .lede { margin-top: 26px; max-width: 34em; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 15px/1 var(--sans); text-decoration: none;
  padding: 14px 20px; border-radius: 3px; border: 1px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn:not(.btn-primary):hover { border-color: var(--accent); }

.status-line {
  margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--rule);
  display: flex; flex-wrap: wrap; gap: 6px 18px;
  font: 400 12.5px/1.5 var(--mono); color: var(--ink-2);
}
.status-line li::before { content: "· "; color: var(--accent); }

/* diagrama de atestação */
.attest { max-width: 440px; margin-inline: auto; width: 100%; }
.attest svg { width: 100%; height: auto; }
.attest .ring { fill: none; stroke: var(--rule); stroke-width: 1; stroke-dasharray: 2 6; }
.attest .link { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-dasharray: 78; stroke-dashoffset: 0; }
.attest .peer circle { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; }
.attest .peer text { font: 500 15px var(--mono); fill: var(--ink); text-anchor: middle; dominant-baseline: central; }
.attest .holder circle { fill: var(--ink); }
.attest .holder .halo { fill: none; stroke: var(--accent); stroke-width: 2; }
.attest .holder text { font: 500 14px var(--mono); fill: var(--paper); text-anchor: middle; dominant-baseline: central; letter-spacing: 0.04em; }

@media (prefers-reduced-motion: no-preference) {
  .attest .link { animation: sign 0.55s ease-out both; animation-delay: calc(0.5s + var(--i) * 0.42s); }
  .attest .peer circle { animation: fill-peer 0.3s ease-out both; animation-delay: calc(0.5s + var(--i) * 0.42s); }
  .attest .holder .halo { animation: halo 0.6s ease-out both; animation-delay: 3.7s; }
  @keyframes sign { from { stroke-dashoffset: 78; } to { stroke-dashoffset: 0; } }
  @keyframes fill-peer { from { stroke: var(--rule); } to { stroke: var(--ink); } }
  @keyframes halo { from { opacity: 0; transform: scale(0.8); } to { opacity: 1; transform: scale(1); } }
  .attest .holder .halo { transform-origin: 200px 200px; }
}

.attest figcaption { margin-top: 18px; font-size: 0.9rem; color: var(--ink-2); }
.attest ol { margin-top: 12px; border-top: 1px solid var(--rule); font: 400 12.5px/1.5 var(--mono); color: var(--ink-2); }
.attest ol li { display: flex; gap: 10px; padding: 5px 0; border-bottom: 1px dotted var(--rule); }
.attest ol b { font-weight: 500; color: var(--accent); min-width: 1ch; }
.attest ol span { flex: 1; color: var(--ink); }
.attest ol i { font-style: normal; }

@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .attest { max-width: 380px; }
}

/* ---------- seções ---------- */

.sec { border-top: 1px solid var(--rule); padding-block: var(--sec-pad); scroll-margin-top: 56px; }
.sec-head {
  display: grid; gap: 20px clamp(32px, 5vw, 72px);
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  align-items: end; margin-bottom: clamp(36px, 5vw, 64px);
}
.sec-head h2 { margin-top: 14px; }
@media (max-width: 900px) { .sec-head { grid-template-columns: 1fr; align-items: start; } }

.sub { margin-top: clamp(44px, 6vw, 72px); }
.sub > h3 { font: 500 1.5rem/1.2 var(--serif); letter-spacing: -0.01em; margin-bottom: 8px; }
.sub > h3 + p { max-width: 46em; color: var(--ink-2); }

/* problema */
.bignum {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px 32px; align-items: center;
  padding: 28px 0; border-block: 1px solid var(--rule);
}
.bignum strong { font: 500 clamp(3.2rem, 9vw, 6.4rem)/0.95 var(--serif); letter-spacing: -0.03em; color: var(--accent); }
.bignum p { max-width: 34em; }
@media (max-width: 640px) { .bignum { grid-template-columns: 1fr; } }

.tries { margin-top: 20px; border-top: 1px solid var(--ink); }
.tries li {
  display: grid; grid-template-columns: 5.5rem minmax(0, 4fr) minmax(0, 3fr); gap: 6px 28px;
  padding: 18px 0; border-bottom: 1px solid var(--rule);
}
.tries .yr { font: 500 14px/1.7 var(--mono); color: var(--ink-2); }
.tries h4 { margin: 0 0 2px; font: 600 1rem/1.4 var(--sans); }
.tries .fail { color: var(--ink-2); font-size: 0.95rem; }
.tries .resp { font-size: 0.95rem; padding-left: 14px; border-left: 2px solid var(--accent); align-self: start; }
.tries .resp b { font: 500 11.5px/1 var(--mono); letter-spacing: 0.1em; color: var(--accent); display: block; margin-bottom: 5px; }
@media (max-width: 760px) {
  .tries li { grid-template-columns: 1fr; gap: 6px; }
  .tries .resp { margin-top: 6px; }
}

.gap {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 20px clamp(32px, 5vw, 72px);
}
.gap h3 { font: 500 1.5rem/1.2 var(--serif); letter-spacing: -0.01em; }
.gap h3 + p { margin-top: 8px; color: var(--ink-2); }
.gap ul { border-top: 1px solid var(--ink); }
.gap li { padding: 12px 0; border-bottom: 1px solid var(--rule); display: flex; gap: 14px; }
.gap li::before { content: "+"; font: 500 1rem/1.6 var(--mono); color: var(--accent); }
@media (max-width: 900px) { .gap { grid-template-columns: 1fr; } }

/* protocolo */
.paths { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--ink); }
.path { padding: clamp(22px, 3vw, 36px); }
.path + .path { border-left: 1px solid var(--ink); }
.path .tag { font: 500 12.5px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); }
.path h3 { font: 500 1.7rem/1.15 var(--serif); margin: 10px 0 8px; letter-spacing: -0.012em; }
.path > p { color: var(--ink-2); font-size: 0.97rem; }
.keys { display: flex; gap: 28px; margin: 22px 0 6px; padding-block: 16px; border-block: 1px solid var(--rule); }
.keys div { display: flex; flex-direction: column; }
.keys b { font: 500 2.3rem/1 var(--serif); letter-spacing: -0.02em; }
.keys span { font: 400 12px/1.4 var(--mono); color: var(--ink-2); margin-top: 6px; }
.path ul { margin-top: 14px; }
.path li { padding: 9px 0 9px 20px; position: relative; font-size: 0.96rem; border-bottom: 1px dotted var(--rule); }
.path li:last-child { border-bottom: 0; }
.path li::before { content: ""; position: absolute; left: 2px; top: 1.15em; width: 7px; height: 1.5px; background: var(--accent); }
.same {
  grid-column: 1 / -1; border-top: 1px solid var(--ink);
  background: var(--ink); color: var(--paper);
  padding: 20px clamp(22px, 3vw, 36px);
  display: flex; flex-wrap: wrap; gap: 6px 28px; align-items: baseline;
}
.same strong { font: 500 1.35rem/1.2 var(--serif); }
.same span { font-size: 0.95rem; opacity: 0.82; }
@media (max-width: 760px) {
  .paths { grid-template-columns: 1fr; }
  .path + .path { border-left: 0; border-top: 1px solid var(--ink); }
}

.formula {
  margin-top: 18px; padding: 18px 20px; background: var(--paper-2); border-left: 3px solid var(--accent);
  font: 400 14px/1.7 var(--mono); overflow-x: auto; white-space: pre;
}

.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 4vw, 56px); margin-top: 26px; }
@media (max-width: 760px) { .cols-2 { grid-template-columns: 1fr; } }

.ledger h4 {
  margin: 0; padding-bottom: 10px; border-bottom: 2px solid currentColor;
  font: 500 12.5px/1.4 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
}
.ledger .on-net h4 { color: var(--net); }
.ledger .on-dev h4 { color: var(--accent); }
.ledger li { padding: 10px 0; border-bottom: 1px solid var(--rule); font-size: 0.97rem; }
.note { margin-top: 22px; font-size: 0.93rem; color: var(--ink-2); max-width: 52em; }

.types { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 26px; border-top: 1px solid var(--ink); }
.types li { padding: 20px 24px 22px 0; border-bottom: 1px solid var(--rule); }
.types li + li { padding-left: 24px; border-left: 1px solid var(--rule); }
.types code { font: 500 1.02rem/1.3 var(--mono); }
.types .when { font: 400 11.5px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); margin-left: 8px; }
.types .when.now { color: var(--net); }
.types p { margin-top: 10px; font-size: 0.95rem; color: var(--ink-2); }
@media (max-width: 760px) {
  .types { grid-template-columns: 1fr; }
  .types li, .types li + li { padding: 18px 0; border-left: 0; }
}

.layers { margin-top: 26px; counter-reset: layer; border-top: 1px solid var(--ink); }
.layers li {
  counter-increment: layer; display: grid; grid-template-columns: 3.2rem 13rem minmax(0, 1fr); gap: 4px 20px;
  padding: 16px 0; border-bottom: 1px solid var(--rule); align-items: baseline;
}
.layers li::before { content: counter(layer); font: 500 1.6rem/1 var(--serif); color: var(--accent); }
.layers b { font-weight: 600; }
.layers span { color: var(--ink-2); font-size: 0.96rem; }
@media (max-width: 760px) {
  .layers li { grid-template-columns: 2.4rem minmax(0, 1fr); }
  .layers span { grid-column: 2; }
}

/* governança */
.rules { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--rule); }
.rules li { padding: 24px 22px 26px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.rules b { display: block; font: 500 clamp(2.1rem, 4vw, 3rem)/1 var(--serif); letter-spacing: -0.025em; white-space: nowrap; }
.rules span { display: block; margin-top: 12px; font-size: 0.95rem; color: var(--ink-2); }
@media (max-width: 860px) { .rules { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .rules { grid-template-columns: 1fr; } }

.threshold { margin-top: 24px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; background: var(--paper-2); }
.threshold li { padding: 20px 18px; border-left: 1px solid var(--rule); }
.threshold li:first-child { border-left: 0; }
.threshold b { display: block; font: 500 1.9rem/1 var(--serif); letter-spacing: -0.02em; color: var(--accent); white-space: nowrap; }
.threshold span { display: block; margin-top: 8px; font-size: 0.88rem; color: var(--ink-2); }
@media (max-width: 860px) {
  .threshold { grid-template-columns: 1fr 1fr; }
  .threshold li { border-left: 0; border-top: 1px solid var(--rule); }
  .threshold li:nth-child(-n+2) { border-top: 0; }
  .threshold li:nth-child(even) { border-left: 1px solid var(--rule); }
  .threshold li:last-child { grid-column: 1 / -1; }
}

/* limites */
.limits { border-top: 1px solid var(--ink); }
.limits li {
  display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: 0 12px; padding: 16px 0;
  border-bottom: 1px solid var(--rule); font-size: 1.04rem;
}
.limits li::before { content: "×"; font: 500 1.3rem/1.25 var(--mono); color: var(--accent); }
.limits small { display: block; margin-top: 3px; font-size: 0.9rem; color: var(--ink-2); }

.risks { border-top: 1px solid var(--ink); }
.risks li { padding: 13px 0; border-bottom: 1px solid var(--rule); }
.risks b { font-weight: 600; display: block; }
.risks span { font-size: 0.9rem; color: var(--ink-2); }

/* estado */
.checks h3 {
  margin: 0; padding-bottom: 10px; border-bottom: 2px solid currentColor;
  font: 500 12.5px/1.4 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
}
.checks .done h3 { color: var(--net); }
.checks .open h3 { color: var(--accent); }
.checks li { padding: 9px 0 9px 28px; position: relative; border-bottom: 1px solid var(--rule); font-size: 0.96rem; }
.checks li::before { position: absolute; left: 0; top: 9px; font: 500 14px/1.7 var(--mono); }
.checks .done li::before { content: "[x]"; color: var(--net); }
.checks .open li::before { content: "[ ]"; color: var(--accent); }

/* documentos */
.docs { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--ink); }
.docs a {
  display: block; padding: 24px 28px 26px 0; text-decoration: none; border-bottom: 1px solid var(--rule);
}
.docs a:nth-child(even) { padding-left: 28px; border-left: 1px solid var(--rule); }
.docs .kind { font: 500 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); }
.docs h3 { font: 500 1.45rem/1.2 var(--serif); margin: 10px 0 6px; letter-spacing: -0.01em; }
.docs h3::after { content: " ↗"; font-family: var(--mono); font-size: 0.75em; color: var(--accent); }
.docs p { font-size: 0.95rem; color: var(--ink-2); }
.docs a:hover { color: inherit; }
.docs a:hover h3 { color: var(--accent); }
@media (max-width: 760px) {
  .docs { grid-template-columns: 1fr; }
  .docs a, .docs a:nth-child(even) { padding: 20px 0; border-left: 0; }
}

.people { margin-top: clamp(40px, 5vw, 64px); display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px clamp(24px, 4vw, 56px); }
.people h4 { margin: 0 0 8px; font: 500 12.5px/1.4 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); }
.people p { font-size: 0.97rem; }
.people .second { margin-top: 10px; }
@media (max-width: 760px) { .people { grid-template-columns: 1fr; } }

/* fecho */
.closing { border-top: 1px solid var(--rule); padding-block: clamp(64px, 10vw, 128px); text-align: center; }
.closing blockquote {
  margin: 0 auto; max-width: 17em;
  font: italic 400 clamp(1.8rem, 4.4vw, 3.2rem)/1.15 var(--serif); letter-spacing: -0.015em; text-wrap: balance;
}
.closing p { margin-top: 22px; font: 400 13px/1.5 var(--mono); color: var(--ink-2); }

footer { border-top: 1px solid var(--ink); padding-block: 28px 44px; font-size: 0.9rem; color: var(--ink-2); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 32px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }

@media print {
  .top, .actions, .skip { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .sec { padding-block: 24pt; }
}