/* ============================================================
   infosec-lab.com — design system v13
   Editorial "field report" style: paper, ink, one print red.
   No gradients. No shadows. No animation. No border radius.
   Type: PT Root UI (text) / PT Serif (headlines) / PT Mono (labels).
   ============================================================ */

/* ---------- Fonts (self-hosted) ---------- */
@font-face { font-family: "PT Root UI"; src: url("../fonts/pt-root-ui-400.woff") format("woff"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "PT Root UI"; src: url("../fonts/pt-root-ui-500.woff") format("woff"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "PT Root UI"; src: url("../fonts/pt-root-ui-700.woff") format("woff"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "PT Serif"; src: url("../fonts/pt-serif-latin.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; unicode-range: U+0000-00FF, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215; }
@font-face { font-family: "PT Serif"; src: url("../fonts/pt-serif-cyrillic.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "PT Mono"; src: url("../fonts/pt-mono-latin.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; unicode-range: U+0000-00FF, U+2000-206F; }
@font-face { font-family: "PT Mono"; src: url("../fonts/pt-mono-cyrillic.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }

/* ---------- Tokens ---------- */
:root {
  --paper: #f7f5f0;
  --surface: #fffdf8;
  --wash: #ede9de;
  --ink: #181611;
  --ink-2: #45423a;
  --ink-3: #6b675a;
  --line: #ddd8cb;
  --line-2: #b9b3a2;
  --red: #b4231f;
  --red-ink: #8f1a17;
  --dark: #16140f;
  --dark-2: #211e17;
  --dark-ink: #f2efe6;
  --dark-muted: #a8a292;
  --dark-line: #3a362c;
  --red-bright: #e04432;
  --sans: "PT Root UI", -apple-system, "Segoe UI", sans-serif;
  --serif: "PT Serif", Georgia, serif;
  --mono: "PT Mono", "Courier New", monospace;
  --logo-filter: none; /* native logo, same as infoseclab.ru */
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.65 var(--sans);
  min-height: 100vh;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }
table { border-collapse: collapse; width: 100%; }

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

:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; font: 500 14px var(--sans);
}
.skip-link:focus { left: 0; }

.wrap { max-width: 1240px; margin: 0 auto; padding: 0 28px; }
.mt-32 { margin-top: 32px; }

/* ---------- Top line ---------- */
.topline { border-bottom: 1px solid var(--line); background: var(--paper); }
.topline-in {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding-top: 9px; padding-bottom: 9px;
  font: 400 12px/1.4 var(--mono); letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink-3);
}
.topline-right { display: flex; gap: 22px; flex-wrap: wrap; }
.topline a { color: var(--ink-2); }
.topline a:hover { color: var(--red); }

/* ---------- Main bar ---------- */
.mainbar {
  position: sticky; top: 0; z-index: 40;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.mainbar-in { display: flex; align-items: center; gap: 28px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; margin-right: 8px; }
.logo-img { filter: var(--logo-filter); width: 38px; height: 38px; object-fit: contain; }
.brand-name { font: 700 19px/1 var(--sans); letter-spacing: -0.01em; white-space: nowrap; }
.brand-name em { font-style: normal; color: var(--red); }

.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a {
  display: inline-flex; align-items: baseline; gap: 7px;
  padding: 10px 2px; position: relative;
  font: 500 15px/1 var(--sans); color: var(--ink-2);
}
.nav-links a .n { font: 400 11px/1 var(--mono); color: var(--ink-3); }
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover .n { color: var(--red); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; background: var(--red);
}

/* "Have you been hacked?" */
.hacked { position: relative; }
.hacked-btn {
  display: inline-flex; align-items: center; gap: 9px;
  min-height: 44px; padding: 0 16px;
  border: 1px solid var(--ink);
  font: 500 14px/1 var(--sans); color: var(--ink);
  background: var(--surface);
}
.hacked-btn:hover { background: var(--ink); color: var(--paper); }
.hacked-btn .dot { width: 8px; height: 8px; background: var(--red); flex: none; }
.hacked-btn:hover .dot { background: var(--red-bright); }
.hacked-panel {
  display: none; position: absolute; right: 0; top: calc(100% + 10px); z-index: 50;
  width: 340px; padding: 20px;
  background: var(--surface); border: 1px solid var(--ink);
}
.hacked-panel a {
  display: block; padding: 9px 0;
  font: 500 15px/1.4 var(--sans); color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.hacked-panel a:hover { color: var(--red); }
.hacked-panel .hacked-cap {
  font: 400 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 8px;
}
.hacked-panel .sub { display: block; padding-top: 10px; font: 400 13px/1.5 var(--sans); color: var(--ink-3); }
.hacked:hover .hacked-panel,
.hacked:focus-within .hacked-panel,
.hacked.open .hacked-panel { display: block; }
.hacked-short { display: none; }

/* Burger */
.burger { display: none; margin-left: auto; width: 44px; height: 44px; position: relative; }
.burger span {
  position: absolute; left: 10px; right: 10px; height: 2px; background: var(--ink);
}
.burger span:first-child { top: 17px; }
.burger span:last-child { top: 25px; }
.mobile-menu {
  display: none; border-top: 1px solid var(--line); background: var(--surface);
}
.mobile-menu a {
  display: block; padding: 15px 28px;
  font: 500 16px/1.3 var(--sans); color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.mobile-menu a.active { color: var(--red); }
.mobile-menu.open { display: block; }

/* ---------- Section scaffolding ---------- */
section { padding: 76px 0; }
.sec-head { margin-bottom: 40px; }
.kicker {
  display: flex; align-items: center; gap: 14px;
  font: 400 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 18px;
}
.kicker::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.kicker .idx { color: var(--red); }
.h-lg { font: 700 clamp(30px, 3.6vw, 46px)/1.12 var(--serif); letter-spacing: -0.01em; }
.h-md { font: 700 clamp(22px, 2.4vw, 28px)/1.25 var(--serif); }
.lead { max-width: 68ch; margin-top: 18px; font: 400 19px/1.65 var(--sans); color: var(--ink-2); }
.sec-head .lead { margin-top: 14px; }

/* ---------- Hero (pages) ---------- */
.hero { padding: 84px 0 72px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 56px; align-items: start; }
.slogan { font: 700 clamp(42px, 5.6vw, 76px)/1.05 var(--serif); letter-spacing: -0.015em; }
.slogan-dim { color: var(--ink-3); }
.slogan-red { color: var(--red); }
.hero .lead { margin-top: 26px; }
.hero-ctas { display: flex; align-items: center; gap: 26px; margin-top: 34px; flex-wrap: wrap; }

.page-hero { padding: 72px 0 60px; }
.page-hero .h-lg { max-width: 22ch; }

/* ---------- Buttons & links ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 26px;
  background: var(--ink); color: var(--paper);
  font: 500 15px/1 var(--sans); letter-spacing: 0.01em;
  border: 1px solid var(--ink);
}
.btn:hover { background: var(--red); border-color: var(--red); color: #fff; }
.btn-lg { min-height: 54px; padding: 0 32px; font-size: 16px; }
.btn-invert { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.btn-invert:hover { background: var(--red-bright); border-color: var(--red-bright); color: #fff; }
.textlink {
  font: 500 15px/1.4 var(--sans); color: var(--ink);
  text-decoration: underline; text-underline-offset: 4px; text-decoration-color: var(--line-2);
}
.textlink:hover { color: var(--red); text-decoration-color: var(--red); }

/* ---------- Ledger (ruled definition rows) ---------- */
.ledger { border-top: 2px solid var(--ink); }
.ledger-cap {
  padding: 12px 0; border-bottom: 1px solid var(--line);
  font: 400 11.5px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3);
}
.ledger-row {
  display: grid; grid-template-columns: 132px 1fr; gap: 16px;
  padding: 13px 0; border-bottom: 1px solid var(--line);
}
.ledger-row dt { font: 400 12px/1.7 var(--mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-3); }
.ledger-row dd { font: 500 15px/1.5 var(--sans); color: var(--ink); }
.ledger-note { padding-top: 12px; font: 400 13px/1.6 var(--sans); color: var(--ink-3); }

/* ---------- Facts strip ---------- */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 0; }
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 26px 24px 26px 0; border-left: 1px solid var(--line); padding-left: 24px; }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat .num { font: 700 34px/1 var(--sans); letter-spacing: -0.02em; }
.stat .num .unit { font: 400 20px var(--mono); color: var(--red); }
.stat .lbl { margin-top: 8px; font: 400 13.5px/1.5 var(--sans); color: var(--ink-2); }

/* ---------- Row lists (services, directions) ---------- */
.rowlist { border-top: 2px solid var(--ink); }
.rowitem {
  display: grid; grid-template-columns: 92px minmax(0, 1fr) auto; gap: 20px;
  padding: 26px 0; border-bottom: 1px solid var(--line);
  color: inherit;
}
a.rowitem:hover { background: var(--wash); }
a.rowitem:hover .rowtitle { color: var(--red); }
.rowcode { font: 400 13px/1.5 var(--mono); color: var(--red); padding-top: 4px; }
.rowbody h3 { font: 700 21px/1.3 var(--sans); letter-spacing: -0.01em; }
.rowbody p { margin-top: 8px; max-width: 62ch; color: var(--ink-2); }
.rowmeta {
  font: 400 12px/1.6 var(--mono); text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--ink-3); text-align: right; padding-top: 6px; white-space: nowrap;
}

/* Direction rows on index: embedded check list */
.dir-checks { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; margin-top: 14px; }
.dir-checks li { font: 400 14.5px/1.55 var(--sans); color: var(--ink-2); padding-left: 16px; position: relative; }
.dir-checks li::before { content: "—"; position: absolute; left: 0; color: var(--red); }
.rowitem .dir-checks { grid-column: 2; }

/* ---------- Modes (three-up, ruled) ---------- */
.modes { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 2px solid var(--ink); }
.mode { padding: 26px 26px 30px 0; border-bottom: 1px solid var(--line); }
.mode + .mode { padding-left: 26px; border-left: 1px solid var(--line); }
.mode .no { font: 400 13px/1 var(--mono); color: var(--red); }
.mode h3 { margin-top: 14px; font: 700 19px/1.3 var(--sans); }
.mode p { margin-top: 10px; font: 400 15px/1.6 var(--sans); color: var(--ink-2); }

/* ---------- Phase ledger ---------- */
.phase-list { border-top: 2px solid var(--ink); }
.phase { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.phase .no { font: 400 14px/1.6 var(--mono); color: var(--red); }
.phase h3 { font: 700 19px/1.35 var(--sans); }
.phase p { margin-top: 6px; max-width: 68ch; color: var(--ink-2); }
.phase-list.compact .phase { padding: 16px 0; }
.phase-list.compact h3 { font-size: 17px; }
.phase-list.compact p { font-size: 14.5px; }

/* ---------- Square list ---------- */
.sq-list { border-top: 2px solid var(--ink); }
.sq-list li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.sq-list li span { display: block; font: 400 16px/1.6 var(--sans); color: var(--ink-2); }
.sq-list li b { color: var(--ink); font-weight: 700; }
.frame-list li { font-size: 15px; }

/* ---------- Tables ---------- */
.tbl-frame { border: 1px solid var(--line-2); background: var(--surface); }
.tbl-cap {
  padding: 12px 18px; border-bottom: 1px solid var(--line);
  font: 400 11.5px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3); background: var(--wash);
}
.tbl { border-collapse: collapse; }
.tbl th {
  text-align: left; padding: 12px 18px;
  font: 400 11.5px/1.4 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); border-bottom: 1px solid var(--line-2);
}
.tbl td { padding: 13px 18px; border-bottom: 1px solid var(--line); font: 400 15px/1.55 var(--sans); color: var(--ink-2); vertical-align: top; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl td.mono { font: 400 13px var(--mono); color: var(--red); white-space: nowrap; }
.tbl-more { padding: 12px 18px; border-top: 1px solid var(--line); }
.tid {
  display: inline-block; margin: 2px 6px 2px 0; padding: 2px 7px;
  border: 1px solid var(--line-2);
  font: 400 12.5px/1.5 var(--mono); color: var(--ink);
}

/* ---------- Split layout ---------- */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.split .h-lg { margin-bottom: 26px; }

/* ---------- Diagram art ---------- */
.dir-art { margin-top: 44px; border: 1px solid var(--line); background: var(--surface); padding: 18px 10px; }
.dir-art svg { width: 100%; height: auto; color: var(--ink); }

/* ---------- Chain note ---------- */
.chain-note { margin-top: 26px; font: 400 14.5px/1.6 var(--sans); color: var(--ink-3); max-width: 74ch; }
.chain-note .textlink { font-size: 14.5px; }

/* ---------- Case documents ---------- */
.case {
  border: 1px solid var(--line-2); background: var(--surface);
  padding: 30px 34px 26px; margin-top: 26px;
}
.case:first-of-type { margin-top: 0; }
.cid {
  display: inline-block; font: 400 12px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--red); border: 1px solid var(--red); padding: 6px 10px 5px;
}
.case h2 { margin-top: 18px; font: 700 clamp(20px, 2.2vw, 26px)/1.3 var(--serif); letter-spacing: -0.01em; }
.case dl { margin-top: 16px; border-top: 1px solid var(--line); }
.case dt {
  padding-top: 12px; font: 400 11.5px/1.6 var(--mono); letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-3);
}
.case dd { font: 400 15.5px/1.6 var(--sans); color: var(--ink-2); }
.case .res { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); font: 400 15.5px/1.6 var(--sans); color: var(--ink); }

/* ---------- Contact channels ---------- */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.chan-list { border-top: 2px solid var(--ink); }
.chan { padding: 18px 0; border-bottom: 1px solid var(--line); }
.chan dt { font: 400 11.5px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.chan dd { margin-top: 8px; }
.chan dd > a { font: 700 18px/1.4 var(--sans); color: var(--ink); text-decoration: underline; text-underline-offset: 4px; text-decoration-color: var(--line-2); }
.chan dd > a:hover { color: var(--red); text-decoration-color: var(--red); }
.chan .sub { display: block; margin-top: 6px; font: 400 14px/1.55 var(--sans); color: var(--ink-3); }
.chan b { font-weight: 700; color: var(--ink); }

/* FAQ */
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; display: flex; justify-content: space-between; gap: 18px; cursor: pointer;
  padding: 17px 0; font: 500 16.5px/1.45 var(--sans); color: var(--ink);
  min-height: 44px; align-items: baseline;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 20px/1 var(--mono); color: var(--red); flex: none; }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 0 18px; max-width: 64ch; color: var(--ink-2); }

/* ---------- Dark band (CTA + footer) ---------- */
.band { background: var(--dark); color: var(--dark-ink); padding: 64px 0; }
.cta-band { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 40px; align-items: center; }
.cta-band .h-md { color: var(--dark-ink); }
.cta-band p { margin-top: 10px; max-width: 58ch; color: var(--dark-muted); }
.cta-band .btn-invert { background: var(--dark-ink); color: var(--dark); border-color: var(--dark-ink); }
.cta-band .btn-invert:hover { background: var(--red-bright); border-color: var(--red-bright); color: #fff; }
.band .textlink { color: var(--dark-ink); text-decoration-color: var(--dark-line); }
.band .textlink:hover { color: var(--red-bright); text-decoration-color: var(--red-bright); }
.band .chain-note { color: var(--dark-muted); margin-top: 18px; }

footer { background: var(--dark); color: var(--dark-ink); border-top: 1px solid var(--dark-line); padding: 56px 0 0; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 2fr) 1fr 1fr 1fr; gap: 40px; padding-bottom: 44px; }
.foot-brand p { margin-top: 16px; max-width: 40ch; font: 400 14.5px/1.65 var(--sans); color: var(--dark-muted); }
.foot-brand .brand-name { color: var(--dark-ink); }
footer h5 {
  font: 400 11.5px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--dark-muted); margin-bottom: 16px;
}
footer .foot-grid a {
  display: block; padding: 5px 0; font: 400 15px/1.5 var(--sans); color: var(--dark-ink);
}
footer .foot-grid a:hover { color: var(--red-bright); }
.foot-bottom {
  border-top: 1px solid var(--dark-line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 18px 0 22px;
  font: 400 12px/1.5 var(--mono); letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--dark-muted);
}

/* ---------- 404 ---------- */
.notfound { padding: 110px 0 120px; text-align: left; }
.notfound .code { font: 400 13px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--red); }
.notfound .h-lg { margin-top: 18px; }

/* ---------- Services list page ---------- */
.svc-list .case { margin-top: 22px; }
.svc-list .case dl { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 0 24px; }
.svc-list .case dt { padding-top: 14px; }
.svc-list .case dd { padding-top: 12px; }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .hero-grid, .split, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .stat { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .stat:nth-child(2) { border-top: 0; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 880px) {
  .nav-links { display: none; }
  .burger { display: block; }
  .hacked { margin-left: auto; }
  .hacked-full { display: none; }
  .hacked-short { display: inline; }
  .modes { grid-template-columns: 1fr; }
  .mode + .mode { padding-left: 0; border-left: 0; }
  .cta-band { grid-template-columns: 1fr; gap: 24px; }
  .rowitem { grid-template-columns: 64px minmax(0, 1fr); }
  .rowmeta { grid-column: 2; text-align: left; padding-top: 8px; }
  .rowitem .dir-checks { grid-column: 2; }
  section { padding: 56px 0; }
  .hero { padding: 60px 0 52px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 18px; }
  .mobile-menu a { padding: 15px 18px; }
  .stats-row { grid-template-columns: 1fr; }
  .stat:nth-child(2) { border-top: 1px solid var(--line); }
  .stat { padding: 20px 0; }
  .stat + .stat { border-top: 1px solid var(--line); }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }
  .dir-checks { grid-template-columns: 1fr; }
  .case { padding: 22px 18px 20px; }
  .tbl td, .tbl th { padding-left: 12px; padding-right: 12px; }
  .phase { grid-template-columns: 56px 1fr; gap: 14px; }
  .ledger-row { grid-template-columns: 104px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  /* Intentional: the site ships zero animation; nothing to reduce. */
}