@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,500;12..96,600;12..96,700&family=IBM+Plex+Mono:wght@400;500;600&family=Newsreader:opsz,wght@6..72,400;6..72,500;6..72,600&display=swap');

:root {
  --night: #08131d;
  --night-2: #0d2230;
  --night-3: #15384b;
  --paper: #f1eee5;
  --paper-2: #e8e4d8;
  --ink: #142c38;
  --muted: #60727b;
  --blue: #5da0ba;
  --blue-deep: #1f607c;
  --cyan: #b8e2dc;
  --amber: #efb461;
  --coral: #d96d57;
  --green: #78b79c;
  --line: rgba(20, 44, 56, 0.18);
  --line-dark: rgba(241, 238, 229, 0.18);
  --sans: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --serif: "Newsreader", Georgia, serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  --measure: 76rem;
  --reading: 44rem;
  --shadow: 0 1.6rem 3rem rgba(8, 19, 29, 0.15);
}

* { box-sizing: border-box; }

html {
  background: var(--night);
  color: var(--ink);
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  min-width: 280px;
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--amber); color: var(--night); }

a { color: inherit; }
a:hover { color: var(--blue-deep); }

button, input { font: inherit; }
button { cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 0.7rem;
  left: 0.7rem;
  z-index: 100;
  padding: 0.6rem 0.85rem;
  border: 2px solid var(--amber);
  background: var(--night);
  color: var(--paper);
  transform: translateY(-180%);
}

.skip-link:focus { transform: translateY(0); }

.container {
  width: min(calc(100% - 3rem), var(--measure));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(241, 238, 229, 0.16);
  background: rgba(8, 19, 29, 0.95);
  color: var(--paper);
  backdrop-filter: blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  flex: 0 0 auto;
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark,
.eyebrow,
.section-kicker,
.mini-label,
.status-tag,
.source-kind,
.table-kicker,
.scenario-tag,
.flow-label,
.figure-index,
.footer-label,
.evidence-index {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  line-height: 1.35;
  text-transform: uppercase;
}

.brand-mark { color: var(--amber); }
.brand-name { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; }

.nav {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  gap: clamp(0.55rem, 1.2vw, 1.15rem);
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav::-webkit-scrollbar { display: none; }

.nav a,
.lang-link {
  color: rgba(241, 238, 229, 0.74);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav a:hover,
.nav a:focus-visible,
.lang-link:hover,
.lang-link:focus-visible { color: var(--amber); }

.lang-link {
  flex: 0 0 auto;
  padding: 0.5rem 0.65rem;
  border: 1px solid rgba(241, 238, 229, 0.28);
}

.language-switch { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 0.5rem; }
.current-language { color: var(--cyan); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.04em; }

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
}

.hero::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(90deg, transparent 49.5%, rgba(184, 226, 220, 0.08) 50%, transparent 50.5%),
    linear-gradient(0deg, transparent 49.5%, rgba(184, 226, 220, 0.08) 50%, transparent 50.5%);
  background-size: 5rem 5rem;
  content: "";
  opacity: 0.5;
  mask-image: linear-gradient(110deg, transparent 8%, black 45%, transparent 96%);
}

.hero::after {
  position: absolute;
  right: -11rem;
  bottom: -17rem;
  z-index: -1;
  width: 42rem;
  height: 42rem;
  border: 1px solid rgba(93, 160, 186, 0.28);
  border-radius: 48% 52% 44% 56%;
  box-shadow: 0 0 0 2.5rem rgba(93, 160, 186, 0.05), 0 0 0 6rem rgba(93, 160, 186, 0.04), 0 0 0 10rem rgba(93, 160, 186, 0.03);
  content: "";
  transform: rotate(-18deg);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(25rem, 1.12fr);
  align-items: center;
  gap: clamp(2.2rem, 6vw, 7rem);
  min-height: min(52rem, calc(100vh - 4rem));
  padding-block: clamp(4rem, 8vw, 7.5rem);
}

.eyebrow,
.section-kicker { color: var(--amber); }

.hero h1,
.section-title,
.mechanism-title,
.memory-line {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.035em;
}

.hero h1 {
  max-width: 10ch;
  margin-top: 0.7rem;
  font-size: clamp(4rem, 8.5vw, 8.4rem);
  line-height: 0.88;
}

.hero-lede {
  max-width: 39rem;
  margin: 1.8rem 0 0;
  color: rgba(241, 238, 229, 0.82);
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1.8vw, 1.55rem);
  line-height: 1.35;
}

.source-ref {
  display: inline-block;
  margin-inline: 0.1em;
  color: var(--blue-deep);
  font-family: var(--mono);
  font-size: 0.66em;
  font-weight: 600;
  text-decoration: none;
  vertical-align: super;
}

.hero .source-ref { color: var(--amber); }
.source-ref:hover { text-decoration: underline; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-top: 2rem;
}

.button,
.button-quiet {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--amber);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

.button { background: var(--amber); color: var(--night); }
.button:hover { color: var(--night); background: #f4c67d; }
.button-quiet { border-color: rgba(241, 238, 229, 0.35); color: var(--paper); }
.button-quiet:hover { border-color: var(--amber); color: var(--amber); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-top: 2.7rem;
  color: rgba(241, 238, 229, 0.62);
  font-family: var(--mono);
  font-size: 0.69rem;
  letter-spacing: 0.03em;
}

.hero-meta span { display: grid; gap: 0.25rem; }
.hero-meta strong { color: var(--cyan); font-weight: 500; text-transform: uppercase; }

.hero-figure {
  position: relative;
  min-width: 0;
}

.figure-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
  color: rgba(241, 238, 229, 0.55);
}

.figure-index { color: var(--cyan); }
.figure-caption { font-family: var(--serif); font-size: 0.95rem; font-style: italic; }

.protocol-plate {
  position: relative;
  min-height: 27rem;
  overflow: hidden;
  border: 1px solid rgba(184, 226, 220, 0.33);
  background: rgba(13, 34, 48, 0.84);
  box-shadow: var(--shadow);
}

.plate-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(184, 226, 220, 0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(184, 226, 220, 0.07) 1px, transparent 1px);
  background-size: 2.8rem 2.8rem;
  opacity: 0.7;
}

.plate-waterline {
  position: absolute;
  inset: 18% 0 auto;
  border-top: 1px dashed rgba(184, 226, 220, 0.4);
  transform: rotate(-8deg);
}

.plate-waterline::after {
  position: absolute;
  right: 12%;
  top: -0.75rem;
  padding: 0.2rem 0.38rem;
  background: var(--night-2);
  color: var(--cyan);
  content: "DTLS / SRTP";
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.06em;
}

.plate-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1.25fr 1fr;
  align-items: center;
  gap: 0.4rem;
  min-height: 27rem;
  padding: 2rem;
}

.plate-node {
  display: grid;
  justify-items: center;
  gap: 0.7rem;
  color: var(--paper);
  text-align: center;
}

.plate-node .node-label {
  max-width: 9rem;
  color: rgba(241, 238, 229, 0.72);
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  line-height: 1.35;
  text-transform: uppercase;
}

.node-symbol {
  display: grid;
  place-items: center;
  width: 4.9rem;
  height: 4.9rem;
  border: 1px solid var(--blue);
  border-radius: 50%;
  background: rgba(93, 160, 186, 0.12);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 1.5rem;
}

.node-symbol.server { border-radius: 0.25rem; color: var(--amber); }
.node-symbol.intermediary { border-color: var(--coral); color: var(--coral); }

.plate-route {
  display: grid;
  justify-items: center;
  gap: 0.8rem;
}

.route-line {
  position: relative;
  width: 100%;
  border-top: 2px solid var(--blue);
}

.route-line::before,
.route-line::after {
  position: absolute;
  top: -0.35rem;
  width: 0.55rem;
  height: 0.55rem;
  border-top: 2px solid var(--blue);
  border-right: 2px solid var(--blue);
  content: "";
  transform: rotate(45deg);
}

.route-line::before { left: 0; transform: rotate(-135deg); }
.route-line::after { right: 0; }

.route-lock {
  display: grid;
  place-items: center;
  width: 3.9rem;
  height: 3.9rem;
  border: 1px solid var(--amber);
  border-radius: 50%;
  background: var(--night);
  color: var(--amber);
  font-size: 1.5rem;
}

.route-caption {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid rgba(241, 238, 229, 0.22);
}

.stat {
  display: grid;
  gap: 0.35rem;
  min-height: 7rem;
  padding: 1.1rem 1rem 0;
  border-right: 1px solid rgba(241, 238, 229, 0.18);
}

.stat:last-child { border-right: 0; }
.stat-value { color: var(--amber); font-family: var(--serif); font-size: 2.5rem; line-height: 1; }
.stat-label { color: rgba(241, 238, 229, 0.68); font-size: 0.78rem; line-height: 1.3; }

.chapter { padding-block: clamp(4.8rem, 9vw, 9rem); }
.chapter-dark { background: var(--night); color: var(--paper); }
.chapter-soft { background: var(--paper-2); }

.section-header {
  display: grid;
  grid-template-columns: minmax(10rem, 0.35fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 5.5rem);
  align-items: start;
  margin-bottom: 3.1rem;
}

.section-title {
  max-width: 19ch;
  font-size: clamp(2.6rem, 5vw, 5.5rem);
  line-height: 0.94;
}

.section-dek {
  max-width: 39rem;
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  line-height: 1.28;
}

.chapter-dark .section-dek { color: rgba(241, 238, 229, 0.68); }

.prose {
  max-width: var(--reading);
  font-family: var(--serif);
  font-size: 1.22rem;
  line-height: 1.48;
}

.prose p { margin: 0 0 1.25rem; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 600; }

.mechanism-intro {
  display: block;
  margin-bottom: 2.6rem;
}

.mechanism-intro .prose { max-width: none; }

.handshake-shell {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(93, 160, 186, 0.42);
  background: #0c2330;
  box-shadow: var(--shadow);
}

.handshake-shell::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(184, 226, 220, 0.07) 1px, transparent 1px), linear-gradient(rgba(184, 226, 220, 0.07) 1px, transparent 1px);
  background-size: 3rem 3rem;
  content: "";
  opacity: 0.65;
}

.handshake-head,
.handshake-body { position: relative; z-index: 1; }

.handshake-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--line-dark);
}

.handshake-head .mini-label { color: var(--cyan); }

.scenario-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.35rem 0.55rem 0.35rem 0.7rem;
  border: 1px solid rgba(241, 238, 229, 0.3);
  background: rgba(8, 19, 29, 0.55);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.03em;
}

.scenario-switch .toggle {
  position: relative;
  display: inline-block;
  width: 2.4rem;
  height: 1.3rem;
  border: 1px solid var(--blue);
  border-radius: 99rem;
  background: rgba(93, 160, 186, 0.22);
}

.scenario-switch .toggle::after {
  position: absolute;
  top: 0.16rem;
  left: 0.17rem;
  width: 0.84rem;
  height: 0.84rem;
  border-radius: 50%;
  background: var(--cyan);
  content: "";
  transition: transform 170ms ease, background-color 170ms ease;
}

.handshake-shell[data-state="bypass"] .scenario-switch .toggle { border-color: var(--coral); }
.handshake-shell[data-state="bypass"] .scenario-switch .toggle::after { background: var(--coral); transform: translateX(1rem); }

.handshake-body { padding: clamp(1.2rem, 4vw, 3.1rem); }

.mechanism-status {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.mechanism-status .status-tag { color: var(--amber); }
.mechanism-status .state-text { color: rgba(241, 238, 229, 0.76); font-family: var(--serif); font-size: 1.1rem; }

.flow {
  display: grid;
  grid-template-columns: minmax(6rem, 0.8fr) minmax(3rem, 1fr) minmax(8rem, 1.2fr) minmax(3rem, 1fr) minmax(6rem, 0.8fr);
  align-items: center;
  gap: clamp(0.35rem, 1.2vw, 1.25rem);
}

.flow-node {
  display: grid;
  justify-items: center;
  gap: 0.75rem;
  min-width: 0;
  color: var(--paper);
  text-align: center;
}

.flow-disc {
  display: grid;
  place-items: center;
  width: clamp(3.6rem, 7vw, 5.8rem);
  height: clamp(3.6rem, 7vw, 5.8rem);
  border: 1px solid var(--blue);
  border-radius: 50%;
  background: rgba(93, 160, 186, 0.14);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: clamp(1rem, 2vw, 1.45rem);
}

.flow-node.server .flow-disc { border-radius: 0.2rem; border-color: var(--amber); color: var(--amber); }
.flow-node.intermediary { display: none; }
.handshake-shell[data-state="bypass"] .flow-node.intermediary { display: grid; }
.flow-node.intermediary .flow-disc { border-color: var(--coral); background: rgba(217, 109, 87, 0.14); color: var(--coral); }

.flow-node .flow-label { max-width: 12rem; color: rgba(241, 238, 229, 0.7); }
.flow-node.intermediary .flow-label { color: var(--coral); }

.flow-link {
  position: relative;
  border-top: 2px solid var(--blue);
}

.flow-link::after {
  position: absolute;
  top: -0.38rem;
  right: 0;
  width: 0.55rem;
  height: 0.55rem;
  border-top: 2px solid var(--blue);
  border-right: 2px solid var(--blue);
  content: "";
  transform: rotate(45deg);
}

.flow-link.warning { border-color: var(--coral); border-top-style: dashed; }
.flow-link.warning::after { border-color: var(--coral); }
.flow-link.bypass-link { display: none; }
.handshake-shell[data-state="bypass"] .flow-link.normal-link { display: none; }
.handshake-shell[data-state="bypass"] .flow-link.bypass-link { display: block; }

.handshake-copy {
  max-width: 48rem;
  margin: 2.4rem auto 0;
  text-align: center;
}

.mechanism-title { font-size: clamp(2.1rem, 4vw, 4.1rem); line-height: 0.98; }
.handshake-copy p { margin: 0.8rem auto 0; color: rgba(241, 238, 229, 0.73); font-family: var(--serif); font-size: 1.2rem; }
.fallback-note { margin: 1.2rem 0 0; color: rgba(241, 238, 229, 0.5); font-family: var(--mono); font-size: 0.68rem; }

.distinction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.distinction-card {
  display: grid;
  align-content: space-between;
  min-height: 20rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--paper-2);
}

.distinction-card:nth-child(2) { background: var(--night-2); color: var(--paper); }
.distinction-card .status-tag { color: var(--blue-deep); }
.distinction-card:nth-child(2) .status-tag { color: var(--amber); }
.distinction-card h3 { max-width: 14ch; margin: 2rem 0 0.8rem; font-family: var(--serif); font-size: clamp(2rem, 3.8vw, 3.8rem); font-weight: 500; line-height: 0.98; letter-spacing: -0.03em; }
.distinction-card p { max-width: 31rem; margin: 0; font-family: var(--serif); font-size: 1.2rem; line-height: 1.45; }
.distinction-mark { margin-top: 2.7rem; color: var(--muted); font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.09em; }
.distinction-card:nth-child(2) .distinction-mark { color: var(--cyan); }
.takeaway { max-width: 47rem; margin: 3rem 0 0 auto; padding-top: 1.4rem; border-top: 1px solid var(--line); font-family: var(--serif); font-size: 1.45rem; line-height: 1.3; }

.evidence-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(20rem, 1.1fr);
  gap: clamp(2rem, 7vw, 8rem);
  align-items: start;
}

.evidence-intro { max-width: 39rem; }
.evidence-scale { padding: 1.5rem; border: 1px solid var(--line); background: rgba(232, 228, 216, 0.52); }
.evidence-scale .mini-label { color: var(--blue-deep); }
.evidence-row { display: grid; grid-template-columns: 3.4rem minmax(0, 1fr); gap: 1rem; align-items: center; padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.evidence-row:last-child { border-bottom: 0; }
.evidence-index { font-size: 1.3rem; letter-spacing: -0.04em; }
.evidence-row[data-tone="amber"] .evidence-index { color: #ae6b20; }
.evidence-row[data-tone="coral"] .evidence-index { color: var(--coral); }
.evidence-label { display: grid; gap: 0.45rem; color: var(--muted); font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.04em; text-transform: uppercase; }
.evidence-bar { position: relative; height: 0.7rem; background: rgba(20, 44, 56, 0.12); }
.evidence-bar span { display: block; height: 100%; background: var(--blue-deep); }
.evidence-bar .bar-33 { width: 100%; }
.evidence-bar .bar-19 { width: 58%; }
.evidence-bar .bar-9 { width: 27%; }
.evidence-row[data-tone="amber"] .evidence-bar span { background: var(--amber); }
.evidence-row[data-tone="coral"] .evidence-bar span { background: var(--coral); }
.evidence-note { margin: 1.3rem 0 0; color: var(--muted); font-family: var(--serif); font-size: 1.1rem; line-height: 1.4; }

.confidence-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 3.5rem; background: var(--line); }
.confidence-card { min-height: 8.5rem; padding: 1.2rem; background: var(--paper); }
.confidence-card .status-tag { color: var(--blue-deep); }
.confidence-card:nth-child(2) .status-tag { color: #ae6b20; }
.confidence-card:nth-child(3) .status-tag { color: var(--coral); }
.confidence-card p { margin: 0.85rem 0 0; font-family: var(--serif); font-size: 1.04rem; line-height: 1.35; }

.table-intro { max-width: 48rem; margin-bottom: 2rem; color: var(--muted); font-family: var(--serif); font-size: 1.2rem; }
.table-wrap { overflow-x: auto; border-top: 2px solid var(--ink); }
.evidence-table { width: 100%; min-width: 61rem; border-collapse: collapse; font-size: 0.9rem; }
.evidence-table th,
.evidence-table td { padding: 1.1rem 0.8rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.evidence-table thead th { color: var(--blue-deep); font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.08em; text-transform: uppercase; }
.evidence-table tbody th { width: 10%; font-family: var(--serif); font-size: 1.28rem; font-weight: 500; }
.evidence-table tbody td { color: #48616b; line-height: 1.4; }
.evidence-table tbody td:last-child { color: var(--ink); font-family: var(--mono); font-size: 0.72rem; }
.table-footnote { max-width: 50rem; margin: 1.25rem 0 0 auto; color: var(--muted); font-family: var(--serif); font-size: 1rem; }

.position-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line-dark); }
.position-card { display: grid; align-content: space-between; min-height: 21rem; padding: 1.5rem; background: var(--night-2); }
.position-card:nth-child(2) { background: #123b4b; }
.position-card:nth-child(3) { background: #183143; }
.position-card .scenario-tag { color: var(--cyan); }
.position-card:nth-child(2) .scenario-tag { color: var(--amber); }
.position-card:nth-child(3) .scenario-tag { color: var(--coral); }
.position-card h3 { margin: 3rem 0 0.8rem; color: var(--paper); font-family: var(--serif); font-size: clamp(1.7rem, 3vw, 2.8rem); font-weight: 500; line-height: 0.98; letter-spacing: -0.03em; }
.position-card p { margin: 0; color: rgba(241, 238, 229, 0.7); font-family: var(--serif); font-size: 1.07rem; line-height: 1.42; }
.position-capability { margin-top: 2rem; padding-top: 0.8rem; border-top: 1px solid var(--line-dark); color: var(--cyan); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.06em; }
.position-note { max-width: 52rem; margin: 2.2rem 0 0 auto; color: rgba(241, 238, 229, 0.64); font-family: var(--serif); font-size: 1.12rem; }

.implications-grid { display: grid; grid-template-columns: minmax(15rem, 0.65fr) minmax(0, 1.35fr); gap: clamp(2rem, 8vw, 9rem); align-items: start; }
.question-list { margin: 0; padding: 0; list-style: none; counter-reset: questions; }
.question-list li { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: 0.8rem; padding: 1rem 0; border-top: 1px solid var(--line); counter-increment: questions; font-family: var(--serif); font-size: 1.35rem; line-height: 1.25; }
.question-list li::before { color: var(--coral); content: counter(questions, decimal-leading-zero); font-family: var(--mono); font-size: 0.7rem; padding-top: 0.25rem; }
.conclusion { max-width: 45rem; margin-top: 3rem; padding-top: 1.35rem; border-top: 2px solid var(--ink); font-family: var(--serif); font-size: clamp(1.35rem, 2.2vw, 1.9rem); line-height: 1.3; }
.memory-line { max-width: 25ch; margin: 3rem 0 0 auto; color: var(--blue-deep); font-size: clamp(2.2rem, 4.4vw, 4.8rem); line-height: 0.95; }

.sources-dek { max-width: 45rem; }
.source-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); }
.source-card { min-height: 20rem; padding: 1.35rem; background: var(--paper-2); }
.source-kind { color: var(--blue-deep); }
.source-card h3 { margin: 1.2rem 0 0.6rem; font-family: var(--serif); font-size: 1.65rem; font-weight: 500; line-height: 1.03; }
.source-byline { color: var(--muted); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.03em; line-height: 1.4; }
.source-card p { max-width: 34rem; margin: 1.1rem 0 0; font-family: var(--serif); font-size: 1rem; line-height: 1.4; }
.source-limit { color: var(--muted); }
.source-limit strong { color: var(--ink); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.04em; text-transform: uppercase; }
.source-card > a { display: inline-block; margin-top: 1.2rem; color: var(--blue-deep); font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.04em; text-decoration: none; text-transform: uppercase; }
.source-card > a:hover { text-decoration: underline; }
.source-cutoff { max-width: 54rem; margin: 2rem 0 0 auto; color: var(--muted); font-family: var(--mono); font-size: 0.7rem; line-height: 1.5; }

.site-footer { padding-block: 2.2rem 3.5rem; background: var(--night); color: var(--paper); }
.footer-grid { display: flex; justify-content: space-between; gap: 2rem; align-items: end; }
.footer-note { max-width: 27rem; font-family: var(--serif); font-size: 1.1rem; line-height: 1.3; }
.no-script { margin-top: 0.9rem; color: rgba(241, 238, 229, 0.54); font-family: var(--mono); font-size: 0.66rem; }
.js-only { display: none; }
body.js-ready .js-only { display: inline; }
body.js-ready .no-script noscript { display: none; }
.footer-meta { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem; align-items: center; color: rgba(241, 238, 229, 0.65); font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; }
.footer-meta a { text-decoration: none; }
.footer-meta a:hover { color: var(--amber); }

.back-to-top {
  position: static;
  display: grid;
  place-items: center;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--amber);
  background: var(--night);
  color: var(--amber);
  font-family: var(--mono);
  font-size: 1rem;
  opacity: 1;
  pointer-events: auto;
  text-decoration: none;
}

body.js-ready .back-to-top {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.6rem);
}

body.js-ready .back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }

.not-found { min-height: 60vh; display: grid; place-items: center; padding: 5rem 1.5rem; background: var(--night); color: var(--paper); }
.not-found-inner { max-width: 38rem; }
.not-found h1 { margin: 0.8rem 0; font-family: var(--serif); font-size: clamp(3rem, 8vw, 7rem); font-weight: 500; line-height: 0.9; }
.not-found p { color: rgba(241, 238, 229, 0.72); font-family: var(--serif); font-size: 1.3rem; }

@media (max-width: 980px) {
  .hero-grid,
  .evidence-layout,
  .implications-grid { grid-template-columns: 1fr; }
  .hero-grid { min-height: auto; }
  .hero-copy { max-width: 52rem; }
  .hero h1 { max-width: 12ch; }
  .hero-figure { max-width: 58rem; }
  .mechanism-intro { grid-template-columns: 1fr; }
  .memory-line { margin-left: 0; }
}

@media (max-width: 760px) {
  .container { width: min(calc(100% - 2rem), var(--measure)); }
  .header-inner { gap: 0.7rem; }
  .brand-mark { display: none; }
  .nav { order: 3; flex-basis: 100%; padding-bottom: 0.6rem; }
  .header-inner { flex-wrap: wrap; padding-top: 0.55rem; }
  .lang-link { margin-left: auto; }
  .hero-grid { padding-block: 3.7rem 4rem; }
  .hero h1 { font-size: clamp(3.7rem, 18vw, 6rem); }
  .hero-lede { font-size: 1.22rem; }
  .protocol-plate { min-height: 22rem; }
  .plate-content { min-height: 22rem; padding: 1rem; }
  .node-symbol { width: 3.9rem; height: 3.9rem; }
  .plate-node .node-label { font-size: 0.56rem; }
  .stats-grid { grid-template-columns: 1fr; }
  .stat { min-height: auto; padding: 0.9rem 0; border-right: 0; border-bottom: 1px solid rgba(241, 238, 229, 0.18); grid-template-columns: 4rem 1fr; align-items: center; }
  .stat:last-child { border-bottom: 0; }
  .stat-value { font-size: 2rem; }
  .section-header { grid-template-columns: 1fr; gap: 0.8rem; margin-bottom: 2.2rem; }
  .section-title { max-width: 16ch; font-size: clamp(2.8rem, 12vw, 4.4rem); }
  .section-dek { font-size: 1.28rem; }
  .chapter { padding-block: 4.5rem; }
  .flow { grid-template-columns: 1fr; gap: 0.65rem; }
  .flow-node { grid-template-columns: 4rem minmax(0, 1fr); justify-items: start; text-align: left; }
  .flow-node .flow-label { align-self: center; }
  .flow-link { width: 2px; height: 1.2rem; margin-left: 1.9rem; border-top: 0; border-left: 2px solid var(--blue); }
  .flow-link::after { top: auto; right: auto; bottom: -0.05rem; left: -0.35rem; border-top: 0; border-right: 2px solid var(--blue); border-bottom: 2px solid var(--blue); transform: rotate(45deg); }
  .flow-link.warning { border-top: 0; border-left-style: dashed; }
  .flow-node.intermediary { display: none; }
  .handshake-shell[data-state="bypass"] .flow-node.intermediary { display: grid; }
  .distinction-grid,
  .confidence-grid,
  .position-grid,
  .source-grid { grid-template-columns: 1fr; }
  .evidence-table { display: block; max-width: 100%; overflow-x: auto; }
  .distinction-card { min-height: 17rem; }
  .confidence-card { min-height: auto; }
  .position-card { min-height: 17rem; }
  .footer-grid { align-items: start; flex-direction: column; }
  .footer-meta { justify-content: flex-start; }
}

@media (max-width: 430px) {
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button, .button-quiet { width: 100%; }
  .figure-head { align-items: flex-start; flex-direction: column; gap: 0.25rem; }
  .plate-content { grid-template-columns: 0.8fr 1.3fr 0.8fr; gap: 0.15rem; padding-inline: 0.5rem; }
  .route-lock { width: 3rem; height: 3rem; font-size: 1.1rem; }
  .route-caption { font-size: 0.55rem; text-align: center; }
  .node-symbol { width: 3.15rem; height: 3.15rem; font-size: 1.1rem; }
  .plate-node .node-label { max-width: 6rem; font-size: 0.52rem; }
  .protocol-plate { min-height: 19rem; }
  .plate-content { min-height: 19rem; }
  .handshake-head { align-items: flex-start; flex-direction: column; }
  .handshake-body { padding: 1rem; }
  .hero-meta { flex-direction: column; gap: 0.9rem; }
  .question-list li { font-size: 1.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}