/* zapret2: как это работает — стили.
   Цвета сегментов взяты из правил раскраски Wireshark:
   TCP — лаванда, UDP — голубой, «Bad TCP» — тёмный фон с красным текстом. */

:root {
  color-scheme: light dark;

  --paper: #f4f5f9;
  --surface: #ffffff;
  --surface-2: #eceef4;
  --ink: #18202c;
  --muted: #5a6476;
  --rule: #d8dce6;
  --accent: #3a56d4;
  --accent-soft: #e3e8ff;

  --tcp: #e7e6ff;
  --tcp-ink: #2d2878;
  --udp: #daeeff;
  --udp-ink: #144a78;
  --sni: #dff7bf;
  --sni-ink: #2c5406;
  --sni-strong: #b9ec7c;
  --cell: #e6e8ef;
  --cell-ink: #4b5566;
  --bad: #12272e;
  --bad-ink: #f78787;
  --ok: #1d7a46;
  --ok-soft: #ddf3e6;
  --warn: #9a5b00;
  --warn-soft: #fff1d6;
  --err: #b42318;
  --err-soft: #fde7e5;

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --radius: 6px;
  --shadow: 0 1px 2px rgb(20 30 50 / 0.06), 0 4px 16px rgb(20 30 50 / 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d1218;
    --surface: #141b24;
    --surface-2: #1b2430;
    --ink: #dbe1ea;
    --muted: #8c97a8;
    --rule: #28313e;
    --accent: #8ea6ff;
    --accent-soft: #1f2a4d;

    --tcp: #2c2a5c;
    --tcp-ink: #d4d0ff;
    --udp: #15334c;
    --udp-ink: #b9dcff;
    --sni: #2b4512;
    --sni-ink: #d2f5a8;
    --sni-strong: #4c7a1c;
    --cell: #202a37;
    --cell-ink: #9aa6b8;
    --bad: #2c0e13;
    --bad-ink: #ff8f8f;
    --ok: #5fd08f;
    --ok-soft: #12301f;
    --warn: #f2b857;
    --warn-soft: #33260c;
    --err: #ff8a80;
    --err-soft: #3a1512;

    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 4px 16px rgb(0 0 0 / 0.25);
  }
}

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

html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.62 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

code, kbd, pre, .mono { font-family: var(--mono); font-size: 0.86em; }
:not(pre) > code {
  background: var(--surface-2);
  padding: 0.08em 0.36em;
  border-radius: 4px;
  overflow-wrap: anywhere;
}

pre {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  line-height: 1.5;
  font-size: 0.8rem;
}

/* ---------- layout ---------- */

.page {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  max-width: 1320px;
  margin: 0 auto;
}

.toc {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  padding: 2rem 1rem 2rem 1.5rem;
  border-right: 1px solid var(--rule);
  font-size: 0.86rem;
}
.toc-title {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
}
.toc-title a { color: inherit; text-decoration: none; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li a {
  display: grid;
  grid-template-columns: 2.1em 1fr;
  gap: 0.2em;
  padding: 0.32rem 0.5rem;
  border-radius: 4px;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.35;
}
.toc li a .n { font-family: var(--mono); font-size: 0.78rem; padding-top: 0.1em; }
.toc li a:hover { color: var(--ink); background: var(--surface-2); }
.toc li a.current { color: var(--tcp-ink); background: var(--tcp); }

.toc-mobile { display: none; }

main { padding: 0 3rem 6rem; min-width: 0; }

.sec { max-width: 760px; margin: 0 auto; padding-top: 4.5rem; }

.wide { max-width: 1000px; margin-left: auto; margin-right: auto; }

@media (max-width: 1000px) {
  .page { grid-template-columns: 1fr; }
  .toc { display: none; }
  .toc-mobile {
    display: block;
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  .toc-mobile summary { cursor: pointer; font-family: var(--mono); font-weight: 600; }
  .toc-mobile ol { margin: 0.5rem 0 0.25rem; padding-left: 1.6rem; }
  .toc-mobile li { padding: 0.15rem 0; }
  main { padding: 0 1.1rem 5rem; }
  html { scroll-padding-top: 3.5rem; }
}

/* ---------- type ---------- */

h1, h2, h3 { font-family: var(--mono); letter-spacing: -0.03em; line-height: 1.15; }

h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin: 0 0 1.25rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
h2 .sec-no {
  font-size: 0.55em;
  font-weight: 500;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.1em 0.45em;
  letter-spacing: 0;
  flex: none;
  transform: translateY(-0.2em);
}
h3 { font-size: 1.15rem; margin: 2.4rem 0 0.6rem; letter-spacing: -0.02em; }

p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.4rem; margin: 0 0 1rem; }
li { margin: 0.25rem 0; }
li::marker { color: var(--muted); }

.lead { font-size: 1.1rem; color: var(--muted); }

.small { font-size: 0.86rem; color: var(--muted); }

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

.hero { max-width: 1000px; margin: 0 auto; padding: 4.5rem 0 1rem; }
.hero-kicker {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 1rem;
}
.hero h1 {
  font-size: clamp(2.1rem, 5.4vw, 3.9rem);
  margin: 0 0 1.25rem;
  max-width: 17ch;
  letter-spacing: -0.045em;
}
.hero h1 em { font-style: normal; color: var(--sni-ink); background: var(--sni); padding: 0 0.12em; border-radius: 4px; }
.hero .lead { max-width: 60ch; margin-bottom: 2.25rem; }

.hero-strip { margin: 0 0 0.5rem; }
.hero-caption {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

/* ---------- the byte strip ---------- */

.strip-wrap { container-type: inline-size; }

.strip {
  --cols: 53;
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  gap: 2px;
  position: relative;
}

.cell {
  height: 28px;
  display: grid;
  place-items: center;
  font: 500 11px/1 var(--mono);
  border-radius: 3px;
  background: var(--cell);
  color: var(--cell-ink);
  overflow: hidden;
  white-space: nowrap;
  transition: background-color 0.25s, color 0.25s, opacity 0.25s, transform 0.25s;
}
.cell.rec, .cell.hs { background: var(--tcp); color: var(--tcp-ink); }
.cell.ext, .cell.sni { background: var(--udp); color: var(--udp-ink); }
.cell.host { background: var(--sni); color: var(--sni-ink); font-weight: 700; font-size: 13px; }
.cell.gap { letter-spacing: -1px; }
.cell.void { background: transparent; }
.cell.fake, .cell.ovl { background: var(--bad); color: var(--bad-ink); }
.cell.ovl { outline: 1px dashed var(--bad-ink); outline-offset: -3px; }
.cell.dim { opacity: 0.28; }
.cell.held { outline: 1px dashed var(--muted); outline-offset: -3px; opacity: 0.7; }
.cell.dropped { opacity: 0.25; text-decoration: line-through; }

@container (max-width: 700px) {
  .cell { font-size: 8px; height: 22px; }
  .cell.host { font-size: 10px; }
}
@container (max-width: 480px) {
  .cell { font-size: 0; height: 18px; border-radius: 2px; }
  .cell.host { font-size: 0; }
  .strip { gap: 1px; }
}

.strip-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin-top: 0.6rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.strip-legend span::before {
  content: "";
  display: inline-block;
  width: 0.8em;
  height: 0.8em;
  border-radius: 2px;
  margin-right: 0.4em;
  vertical-align: -0.05em;
  background: var(--cell);
}
.strip-legend .l-tcp::before { background: var(--tcp); }
.strip-legend .l-udp::before { background: var(--udp); }
.strip-legend .l-sni::before { background: var(--sni-strong); }
.strip-legend .l-bad::before { background: var(--bad); outline: 1px solid var(--bad-ink); }

/* hero: strip splits at midsld, fake slides in */
.hero-anim .cell { animation: none; }
@media (prefers-reduced-motion: no-preference) {
  .hero-anim.play .cell.after-cut { animation: slide-right 5s ease-in-out infinite; }
  .hero-anim.play .cut { animation: cut-in 5s ease-in-out infinite; }
}
.cut {
  position: absolute;
  top: -8px;
  bottom: -8px;
  width: 2px;
  background: var(--bad-ink);
  opacity: 0;
  pointer-events: none;
}
@keyframes slide-right {
  0%, 20% { transform: translateX(0); }
  35%, 80% { transform: translateX(10px); }
  95%, 100% { transform: translateX(0); }
}
@keyframes cut-in {
  0%, 15% { opacity: 0; }
  22%, 82% { opacity: 1; }
  95%, 100% { opacity: 0; }
}

/* ---------- blocks ---------- */

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.8rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}
.callout > :last-child { margin-bottom: 0; }
.callout.warn { border-color: var(--warn); background: var(--warn-soft); }
.callout.key { border-color: var(--sni-strong); background: var(--sni); color: var(--sni-ink); }
.callout.key code { background: rgb(255 255 255 / 0.45); }
@media (prefers-color-scheme: dark) { .callout.key code { background: rgb(0 0 0 / 0.25); } }
.callout-title { font-family: var(--mono); font-weight: 700; font-size: 0.82rem; display: block; margin-bottom: 0.3rem; }

.fig {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1.25rem;
  margin: 1.75rem 0;
  box-shadow: var(--shadow);
}
.fig > figcaption, .fig-cap { font-size: 0.82rem; color: var(--muted); margin-top: 0.8rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 1rem 0 1.5rem; }
th, td { text-align: left; vertical-align: top; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--rule); }
th { font-family: var(--mono); font-size: 0.78rem; font-weight: 600; color: var(--muted); }
.table-scroll { overflow-x: auto; }

.btn {
  font: 600 0.85rem var(--sans);
  border: 1px solid var(--rule);
  background: var(--surface);
  color: var(--ink);
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.primary:hover { opacity: 0.9; }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }

.chip {
  display: inline-block;
  font: 500 0.74rem/1.5 var(--mono);
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  white-space: nowrap;
}
.chip.tcp { background: var(--tcp); color: var(--tcp-ink); }
.chip.udp { background: var(--udp); color: var(--udp-ink); }
.chip.sni { background: var(--sni); color: var(--sni-ink); }
.chip.bad { background: var(--bad); color: var(--bad-ink); }
.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.warn { background: var(--warn-soft); color: var(--warn); }
.chip.err { background: var(--err-soft); color: var(--err); }

/* ---------- network path diagram ---------- */

.net-svg { width: 100%; height: auto; display: block; }
.net-svg text { font-family: var(--sans); fill: var(--ink); }
.net-svg .lbl { font-size: 13px; font-weight: 600; }
.net-svg .sub { font-size: 11px; fill: var(--muted); }
.net-svg .node { fill: var(--surface-2); stroke: var(--rule); }
.net-svg .node.dpi { fill: var(--bad); stroke: var(--bad-ink); }
.net-svg .node.dpi + text, .net-svg .dpi-t { fill: var(--bad-ink); }
.net-svg .node.me { fill: var(--tcp); stroke: var(--tcp-ink); }
.net-svg .wire { stroke: var(--muted); stroke-width: 1.5; }
.net-svg .ttl { font: 600 11px var(--mono); fill: var(--muted); }
.net-svg .fake-path { stroke: var(--bad-ink); stroke-width: 2; stroke-dasharray: 5 4; fill: none; }
.net-svg .real-path { stroke: var(--tcp-ink); stroke-width: 2; fill: none; }
.net-svg .x { stroke: var(--bad-ink); stroke-width: 2.5; }

/* ---------- pipeline stepper ---------- */

.pipe {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  counter-reset: st;
}
.pipe li {
  margin: 0;
  counter-increment: st;
}
.pipe button {
  width: 100%;
  height: 100%;
  min-height: 74px;
  text-align: left;
  font: 600 0.74rem/1.25 var(--sans);
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0.45rem 0.5rem;
  cursor: pointer;
  position: relative;
}
.pipe button::before {
  content: counter(st);
  display: block;
  font: 700 0.7rem var(--mono);
  margin-bottom: 0.25rem;
  opacity: 0.7;
}
.pipe .k-kernel button { border-top: 3px solid var(--udp-ink); }
.pipe .k-user button { border-top: 3px solid var(--tcp-ink); }
.pipe button.done { color: var(--ink); }
.pipe button.active { background: var(--tcp); color: var(--tcp-ink); border-color: var(--tcp-ink); }
.pipe-detail {
  min-height: 9.5rem;
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}
.pipe-detail h4 { font: 700 1rem var(--mono); margin: 0 0 0.4rem; letter-spacing: -0.02em; }
.pipe-detail p { font-size: 0.95rem; margin-bottom: 0.6rem; }
.pipe-detail pre { margin: 0.4rem 0 0; }
.pipe-legend { display: flex; gap: 1rem; font-size: 0.78rem; color: var(--muted); margin-bottom: 0.75rem; }
.pipe-legend .kk::before, .pipe-legend .ku::before {
  content: ""; display: inline-block; width: 1.4em; height: 3px; vertical-align: middle; margin-right: 0.4em;
}
.pipe-legend .kk::before { background: var(--udp-ink); }
.pipe-legend .ku::before { background: var(--tcp-ink); }
@media (max-width: 760px) {
  .pipe { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- annotated command ---------- */

.cmd {
  font: 0.8rem/1.9 var(--mono);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  overflow-x: auto;
}
.cmd .row { display: flex; gap: 1rem; align-items: baseline; white-space: nowrap; }
.cmd .row .note {
  font-family: var(--sans);
  font-size: 0.74rem;
  color: var(--muted);
  white-space: normal;
  min-width: 14rem;
}
.cmd .t-glob { color: var(--muted); }
.cmd .t-filt { color: var(--udp-ink); background: var(--udp); border-radius: 3px; padding: 0 0.25em; }
.cmd .t-in { color: var(--warn); }
.cmd .t-inst { color: var(--tcp-ink); background: var(--tcp); border-radius: 3px; padding: 0 0.25em; }
.cmd .t-new { color: var(--bad-ink); background: var(--bad); border-radius: 3px; padding: 0 0.25em; }
.cmd .indent { padding-left: 1.5rem; }

/* ---------- syntax anatomy ---------- */

.anatomy {
  font: 600 clamp(0.85rem, 2.2vw, 1.2rem)/1.2 var(--mono);
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0.5rem 0 1rem;
}
.anatomy span { padding: 0.35rem 0.1rem 1.6rem; position: relative; }
.anatomy span[data-l]::after {
  content: attr(data-l);
  position: absolute;
  left: 0.1rem;
  bottom: 0.1rem;
  font: 500 0.66rem/1 var(--sans);
  color: var(--muted);
  white-space: nowrap;
}
.anatomy .a-opt { color: var(--muted); }
.anatomy .a-fn { color: var(--tcp-ink); background: var(--tcp); border-radius: 3px; }
.anatomy .a-arg { color: var(--udp-ink); }
.anatomy .a-val { color: var(--sni-ink); }
.anatomy .a-flag { color: var(--warn); }
.anatomy .a-sep { color: var(--muted); padding-left: 0; padding-right: 0; }

/* ---------- markers explorer ---------- */

.mx-controls { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-bottom: 1.1rem; }
.mx-input {
  font: 0.95rem var(--mono);
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  min-width: 15rem;
  flex: 1 1 15rem;
}
.mx-presets { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 1rem; }
.mx-presets button {
  font: 0.75rem var(--mono);
  border: 1px solid var(--rule);
  background: var(--surface-2);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  cursor: pointer;
}
.mx-presets button:hover { border-color: var(--muted); }
.mx-stage { position: relative; padding: 1.6rem 0 0.2rem; }
.mx-mark {
  position: absolute;
  top: 0;
  bottom: -4px;
  width: 0;
  border-left: 2px solid var(--bad-ink);
  pointer-events: none;
}
.mx-mark span {
  position: absolute;
  top: -0.1rem;
  left: 3px;
  font: 600 0.68rem var(--mono);
  color: var(--bad-ink);
  white-space: nowrap;
  background: var(--surface);
  padding: 0 2px;
}
.mx-out { font-size: 0.88rem; margin-top: 0.9rem; min-height: 2.8em; }
.mx-out .seg { font-family: var(--mono); }
.strip .cell.alt { filter: brightness(0.88); }
@media (prefers-color-scheme: dark) { .strip .cell.alt { filter: brightness(1.35); } }

/* ---------- attack lab ---------- */

.lab { padding: 0; overflow: hidden; }
.lab-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.7rem 0.8rem 0;
  border-bottom: 1px solid var(--rule);
  background: var(--surface-2);
}
.lab-tabs button {
  font: 600 0.78rem var(--mono);
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--muted);
  padding: 0.45rem 0.7rem;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
}
.lab-tabs button[aria-selected="true"] { background: var(--surface); color: var(--ink); border-color: var(--rule); margin-bottom: -1px; }
.lab-body { padding: 1.1rem 1.25rem 1.3rem; }
.lab-head { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; align-items: start; }
.lab-idea { font-size: 0.95rem; margin: 0 0 0.6rem; }
.lab-cmd { margin: 0 0 1rem; font-size: 0.78rem; padding: 0.55rem 0.75rem; white-space: pre-wrap; word-break: break-all; }
@media (max-width: 700px) { .lab-head { grid-template-columns: 1fr; } }

.track {
  position: relative;
  height: 76px;
  margin: 0.4rem 0 1rem;
}
.track-line { position: absolute; left: 3%; right: 3%; top: 26px; height: 2px; background: var(--rule); }
.track-node {
  position: absolute;
  top: 12px;
  transform: translateX(-50%);
  text-align: center;
  font-size: 0.72rem;
  color: var(--muted);
  width: 7.5rem;
}
.track-node b {
  display: block;
  margin: 0 auto 0.35rem;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--rule);
}
.track-node.n-me b { background: var(--tcp); border-color: var(--tcp-ink); }
.track-node.n-dpi b { background: var(--bad); border-color: var(--bad-ink); }
.track-node.n-srv b { background: var(--sni); border-color: var(--sni-ink); }
.track-ttl {
  position: absolute;
  top: 8px;
  height: 38px;
  border-left: 2px dotted var(--bad-ink);
  font: 600 0.64rem var(--mono);
  color: var(--bad-ink);
  padding-left: 4px;
  white-space: nowrap;
}
.pkt {
  position: absolute;
  top: 18px;
  width: 26px;
  height: 18px;
  margin-left: -13px;
  border-radius: 4px;
  background: var(--tcp-ink);
  box-shadow: 0 0 0 3px var(--surface);
  opacity: 0;
  z-index: 2;
}
.pkt.fake { background: var(--bad-ink); }
.pkt-x {
  position: absolute;
  top: 12px;
  margin-left: -9px;
  font: 700 22px/1 var(--mono);
  color: var(--bad-ink);
  z-index: 3;
  pointer-events: none;
}

.rows { display: grid; gap: 4px; margin-bottom: 0.9rem; }
.row-h, .prow {
  display: grid;
  grid-template-columns: 1.8rem minmax(0, 1fr) 8.5rem;
  gap: 0.6rem;
  align-items: center;
}
.row-h { font: 600 0.68rem var(--mono); color: var(--muted); }
.prow { animation: row-in 0.3s ease-out; }
.prow .no { font: 600 0.72rem var(--mono); color: var(--muted); text-align: right; }
.prow .fate { font-size: 0.72rem; line-height: 1.25; }
.prow.current .no { color: var(--ink); }
.prow.current .no::before { content: "▸"; margin-right: 1px; }
@keyframes row-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .prow { animation: none; } }
@media (max-width: 700px) {
  .row-h, .prow { grid-template-columns: 1.4rem minmax(0, 1fr); }
  .row-h .fate-h, .prow .fate { grid-column: 2; }
}

.lab-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; }
@media (max-width: 800px) { .lab-panels { grid-template-columns: 1fr; } }
.panel {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
  font-size: 0.88rem;
  min-height: 7.2rem;
}
.panel h4 { margin: 0 0 0.45rem; font: 700 0.78rem var(--mono); display: flex; gap: 0.5rem; align-items: center; justify-content: space-between; }
.panel.dpi { background: var(--bad); color: #f1d9d9; border-color: transparent; }
.panel.dpi h4 { color: var(--bad-ink); }
@media (prefers-color-scheme: light) { .panel.dpi { color: #f4dede; } }
.panel .dpi-log { margin: 0; padding-left: 1.1rem; }
.panel .dpi-log li { margin: 0.15rem 0; }
.panel .strip { margin: 0.25rem 0 0.55rem; }
.verdict { font-weight: 600; }
.verdict.ok { color: var(--ok); }
.verdict.bad { color: var(--err); }
.panel.dpi .verdict.ok { color: #7fe0a8; }
.panel.dpi .verdict.bad { color: #ffb4a8; }
.lab-controls { margin-top: 1rem; }
.lab-step { font: 0.78rem var(--mono); color: var(--muted); margin-left: auto; }

/* ---------- circular sim ---------- */

.circ { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 1.25rem; align-items: start; }
@media (max-width: 720px) { .circ { grid-template-columns: 1fr; } }
.circ-ring { width: 100%; height: auto; }
.circ-ring text { font-family: var(--mono); }
.circ-ring .s { fill: var(--surface-2); stroke: var(--rule); stroke-width: 1.5; transition: fill 0.3s; }
.circ-ring .s.on { fill: var(--tcp); stroke: var(--tcp-ink); }
.circ-ring .s.final { stroke-dasharray: 4 3; }
.circ-ring .st { font-size: 13px; font-weight: 700; fill: var(--muted); text-anchor: middle; dominant-baseline: central; }
.circ-ring .st.on { fill: var(--tcp-ink); }
.circ-ring .arc { fill: none; stroke: var(--rule); stroke-width: 2; }
.circ-ring .center { font-size: 11px; fill: var(--muted); text-anchor: middle; }
.circ-ring .big { font-size: 22px; font-weight: 700; fill: var(--ink); text-anchor: middle; }
.circ-log {
  font: 0.78rem/1.55 var(--mono);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
  height: 11.5rem;
  overflow-y: auto;
  margin: 0.8rem 0 0;
}
.circ-log div { white-space: pre-wrap; }
.circ-log .l-fail { color: var(--err); }
.circ-log .l-ok { color: var(--ok); }
.circ-log .l-rot { color: var(--tcp-ink); font-weight: 700; }

/* ---------- decoder ---------- */

.dec-input {
  width: 100%;
  min-height: 11rem;
  font: 0.8rem/1.55 var(--mono);
  padding: 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  resize: vertical;
}
.dec-bar { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin: 0.7rem 0 1.2rem; }
.dec-bar .small { margin-left: 0.25rem; }
.dec-sum { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1rem; }
.dec-group { margin: 1.3rem 0 0.5rem; font: 700 0.85rem var(--mono); display: flex; align-items: center; gap: 0.6rem; }
.dec-group::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.dec-item {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 0.7rem 0.85rem;
  margin: 0.45rem 0;
  background: var(--surface);
}
.dec-item.filter { background: var(--surface-2); border-style: dashed; }
.dec-line { font: 600 0.8rem var(--mono); overflow-wrap: anywhere; margin-bottom: 0.3rem; }
.dec-line .fn { color: var(--tcp-ink); background: var(--tcp); border-radius: 3px; padding: 0 0.25em; }
.dec-what { font-size: 0.9rem; margin-bottom: 0.4rem; }
.dec-ctx { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.4rem; }
.dec-args { list-style: none; padding: 0; margin: 0; font-size: 0.85rem; }
.dec-args li { display: grid; grid-template-columns: minmax(8rem, max-content) minmax(0, 1fr); gap: 0.2rem 0.8rem; margin: 0.18rem 0; }
.dec-args code { font-size: 0.76rem; }
.dec-args .unk { color: var(--err); }
.dec-warn {
  font-size: 0.85rem;
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  margin-top: 0.45rem;
  background: var(--warn-soft);
  color: var(--warn);
}
.dec-warn.err { background: var(--err-soft); color: var(--err); }
.dec-warn.info { background: var(--accent-soft); color: var(--accent); }
.dec-empty { color: var(--muted); font-size: 0.9rem; }

/* ---------- misc ---------- */

.two { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 720px) { .two { grid-template-columns: 1fr; } }
.card { border: 1px solid var(--rule); border-radius: 8px; padding: 0.85rem 1rem; background: var(--surface); }
.card h4 { margin: 0 0 0.4rem; font: 700 0.92rem var(--mono); }
.card p, .card ul { font-size: 0.92rem; margin-bottom: 0.4rem; }

dl.gloss { display: grid; grid-template-columns: max-content 1fr; gap: 0.45rem 1.2rem; font-size: 0.93rem; }
dl.gloss dt { font-family: var(--mono); font-weight: 700; font-size: 0.85rem; }
dl.gloss dd { margin: 0; }
@media (max-width: 600px) { dl.gloss { grid-template-columns: 1fr; } dl.gloss dd { margin-bottom: 0.5rem; } }

footer.foot {
  max-width: 760px;
  margin: 5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.82rem;
  color: var(--muted);
}

.noscript { background: var(--warn-soft); color: var(--warn); padding: 0.6rem 0.8rem; border-radius: 6px; font-size: 0.9rem; }