/* Key Surveillance — field manual (dark only) */

:root {
  --bg: #121816;
  --bg-elevated: #1b2420;
  --ink: #e6efe9;
  --ink-muted: #9bb0a4;
  --line: #2d3b34;
  --accent: #3ecfaf;
  --accent-soft: rgba(62, 207, 175, 0.14);
  --warn: #e0a05a;
  --sidebar-w: 18.5rem;
  --site-nav-h: 4.5rem;
  --topbar-h: 3.5rem;
  --chrome-gap: calc(var(--site-nav-h) + var(--topbar-h));
  --lp-accent: #38bdf8;
  --lp-border: rgba(56, 189, 248, 0.2);
  --radius: 6px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --font-sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --content-max: 46rem;
  --page-pad: clamp(0.75rem, 3vw, 3rem);
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--chrome-gap) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(62, 207, 175, 0.1), transparent 55%),
    radial-gradient(circle at 50% 0%, rgba(14, 165, 233, 0.08), transparent 55%),
    linear-gradient(180deg, #0e1412 0%, var(--bg) 30%);
  background-attachment: fixed;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: #0b1512;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 1100;
  background: var(--lp-accent);
  transition: width 80ms linear;
}

/* Landing-page site chrome */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(3, 7, 18, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--lp-border);
}

.site-header .main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 5%;
  flex-wrap: wrap;
}

.site-header .nav-left,
.site-header .nav-right {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  flex-wrap: wrap;
}

.site-header a {
  color: #94a3b8;
  font-weight: 500;
  text-decoration: none;
  font-family: Inter, var(--font-sans);
  font-size: 0.95rem;
}

.site-header a:hover,
.site-header a.active {
  color: #f8fafc;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.25);
  text-decoration: none;
}

.site-header .brand {
  font-family: "Space Grotesk", var(--font-sans);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--lp-accent) !important;
  text-shadow: 0 0 15px rgba(56, 189, 248, 0.35);
}

.site-header .nav-sep {
  color: #3a5a7a;
}

.site-header .dropdown {
  position: relative;
}

.site-header .dropbtn {
  background: none;
  border: none;
  color: #94a3b8;
  font-weight: 500;
  font-family: Inter, var(--font-sans);
  font-size: 0.95rem;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.site-header .dropbtn:hover {
  color: #f8fafc;
}

.site-header .dropdown-content {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 280px;
  max-height: min(70vh, 28rem);
  overflow: auto;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(20px);
  border: 1px solid var(--lp-border);
  border-radius: 12px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
  padding: 0.45rem 0;
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.site-header .dropdown:hover .dropdown-content,
.site-header .dropdown:focus-within .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-header .dropdown-content a {
  display: block;
  padding: 0.7rem 1.15rem;
  color: #94a3b8;
  font-size: 0.92rem;
  white-space: normal;
}

.site-header .dropdown-content a:hover,
.site-header .dropdown-content a.active {
  background: rgba(56, 189, 248, 0.1);
  color: var(--lp-accent);
}

.site-header .nav-call-to,
.site-footer .cta-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 100%);
  color: #fff !important;
  font-weight: 600;
  text-decoration: none !important;
  border: 1px solid rgba(255, 255, 255, 0.2);
  text-shadow: none !important;
}

.site-header .nav-call-to:hover,
.site-footer .cta-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px -8px rgba(14, 165, 233, 0.55);
  color: #fff !important;
}

.site-menu-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.65rem;
  border: 1px solid var(--lp-border);
  border-radius: var(--radius);
  background: rgba(15, 23, 42, 0.8);
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  touch-action: manipulation;
}

.site-menu-toggle span {
  display: block;
  height: 2px;
  background: #e2e8f0;
  border-radius: 1px;
}

.site-footer {
  margin-top: auto;
  background: rgba(3, 7, 18, 0.92);
  border-top: 1px solid var(--lp-border);
  padding: 2.5rem 5%;
  text-align: center;
  color: #94a3b8;
  font-family: Inter, var(--font-sans);
  font-size: 0.95rem;
}

.site-footer a {
  color: var(--lp-accent);
  text-decoration: none;
}

.site-footer a:hover {
  color: #7dd3fc;
}

.site-footer .footer-cta-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.75rem 0 1.5rem;
}

.site-footer .footer-links {
  margin-top: 0.75rem;
}

.linktree-footer-qr {
  display: none;
  margin: 0.75rem auto;
  text-align: center;
}

.linktree-footer-qr img {
  width: 128px;
  height: 128px;
  margin: 0 auto;
  background: #fff;
  border: 0;
}

.linktree-footer-qr figcaption {
  margin-top: 0.35rem;
  font-size: 0.85rem;
  color: #64748b;
}

@media (min-width: 768px) {
  .linktree-footer-qr {
    display: block;
  }
}

#google_translate_element {
  position: fixed;
  right: 12px;
  bottom: 12px;
  z-index: 10050;
  max-width: 168px;
  font-size: 12px;
  line-height: 1.2;
}

@media (max-width: 600px) {
  #google_translate_element {
    right: 8px;
    bottom: 8px;
    max-width: 120px;
    font-size: 11px;
    transform: scale(0.85);
    transform-origin: bottom right;
  }
}

/* Manual reader top bar */

.topbar {
  position: sticky;
  top: var(--site-nav-h);
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  min-height: var(--topbar-h);
  padding: 0.45rem 1rem;
  padding-left: max(1rem, env(safe-area-inset-left));
  padding-right: max(1rem, env(safe-area-inset-right));
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.doc-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.02em;
  min-width: 0;
}

.brand-mark {
  flex-shrink: 0;
  width: 1.15rem;
  height: 1.15rem;
  border: 2px solid var(--accent);
  border-radius: 2px;
  box-shadow: inset 0 0 0 3px var(--bg-elevated), 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent);
  background:
    linear-gradient(135deg, transparent 46%, var(--accent) 46%, var(--accent) 54%, transparent 54%),
    radial-gradient(circle at 50% 50%, var(--accent) 18%, transparent 19%);
}

.toc-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  touch-action: manipulation;
}

.toc-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
}

.search {
  display: flex;
  min-width: 0;
}

.search input {
  width: min(28rem, 100%);
  margin-left: auto;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
  min-width: 0;
}

.search input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

/* Layout */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  flex: 1;
  min-height: 0;
}

.sidebar {
  position: sticky;
  top: var(--chrome-gap);
  height: calc(100vh - var(--chrome-gap));
  height: calc(100dvh - var(--chrome-gap));
  overflow: auto;
  overscroll-behavior: contain;
  padding: 1.25rem 0.85rem 2rem;
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-elevated) 70%, transparent);
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem 0.75rem;
}

.sidebar-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.sidebar-close {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  color: var(--ink-muted);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
}

.toc {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.toc a {
  display: block;
  padding: 0.4rem 0.55rem;
  border-radius: 4px;
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 0.86rem;
  line-height: 1.35;
  border-left: 2px solid transparent;
}

.toc a:hover {
  color: var(--ink);
  background: var(--accent-soft);
}

.toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 500;
}

.toc a.level-1 {
  font-weight: 600;
  color: var(--ink);
  margin-top: 0.55rem;
}

.toc a.level-2 {
  padding-left: 1rem;
}

.main {
  min-width: 0;
  padding: 1.5rem var(--page-pad) 4rem;
  padding-bottom: max(4rem, calc(2rem + env(safe-area-inset-bottom)));
}

.doc {
  max-width: calc(var(--content-max) + 8rem);
  margin: 0 auto;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  background:
    linear-gradient(90deg, transparent 39px, color-mix(in srgb, var(--line) 55%, transparent) 39px, color-mix(in srgb, var(--line) 55%, transparent) 40px, transparent 40px),
    var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  animation: rise 0.55s ease both;
  overflow-wrap: anywhere;
  word-break: break-word;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Hero */

.hero {
  margin: 0 0 2rem;
  padding: 0 0 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.hero-brand {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4.5vw, 2.85rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.hero-lede {
  margin: 0 0 1.35rem;
  max-width: 38rem;
  color: var(--ink-muted);
  font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 0.95rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
  touch-action: manipulation;
  text-align: center;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #0b1512;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.callout {
  margin: 0 0 2.5rem;
  padding: 1.25rem 1.35rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.callout h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.pillars {
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.pillars li {
  padding-left: 0;
  color: var(--ink-muted);
}

.pillars strong {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.92rem;
}

/* Typography in doc */

.doc > h1,
.doc section > h1 {
  margin: 2.75rem 0 1rem;
  padding-top: 0.5rem;
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.8vw, 1.95rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  border-top: 1px solid var(--line);
}

.doc > h1:first-of-type,
.doc .hero + .callout + h1,
.doc .callout + h2 {
  border-top: 0;
}

.doc h2 {
  margin: 2rem 0 0.75rem;
  font-size: clamp(1.1rem, 2.4vw, 1.28rem);
  letter-spacing: -0.01em;
}

.doc h3 {
  margin: 1.5rem 0 0.55rem;
  font-size: 1.05rem;
  color: color-mix(in srgb, var(--ink) 88%, var(--accent));
}

.doc p,
.doc li {
  color: color-mix(in srgb, var(--ink) 92%, var(--ink-muted));
}

.doc ul,
.doc ol {
  padding-left: 1.25rem;
}

.doc li + li {
  margin-top: 0.35rem;
}

.doc img {
  margin: 1rem 0 1.35rem;
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  max-width: 100%;
}

table {
  width: 100%;
  min-width: 28rem;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  padding: 0.65rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: color-mix(in srgb, var(--accent-soft) 80%, var(--bg-elevated));
  font-weight: 600;
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: 0;
}

tr:hover td {
  background: color-mix(in srgb, var(--accent-soft) 40%, transparent);
}

mark.search-hit {
  background: color-mix(in srgb, var(--warn) 35%, transparent);
  color: inherit;
  padding: 0 0.1em;
  border-radius: 2px;
}

.doc-note {
  max-width: calc(var(--content-max) + 8rem);
  margin: 1.5rem auto 0;
  padding: 0 0.25rem;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

/* Search panel */

.search-panel {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  left: auto;
  top: calc(var(--topbar-h) + 0.5rem);
  width: min(24rem, calc(100vw - 2rem));
  max-height: min(28rem, 70vh);
  overflow: auto;
  overscroll-behavior: contain;
  z-index: 55;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 0.75rem;
}

.search-panel[hidden] {
  display: none;
}

.search-meta {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  color: var(--ink-muted);
  font-family: var(--font-mono);
}

#search-results {
  list-style: none;
  margin: 0;
  padding: 0;
}

#search-results li + li {
  margin-top: 0.35rem;
}

#search-results a {
  display: block;
  padding: 0.65rem 0.7rem;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  background: color-mix(in srgb, var(--bg) 60%, transparent);
  border: 1px solid transparent;
}

#search-results a:hover,
#search-results a:focus {
  border-color: var(--accent);
  background: var(--accent-soft);
}

#search-results strong {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 0.15rem;
}

#search-results span {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

.backdrop {
  display: none;
}

/* Tablet / mobile */

@media (max-width: 960px) {
  :root {
    --topbar-h: 3.25rem;
    --page-pad: 0.75rem;
  }

  body {
    font-size: 1rem;
    background-attachment: scroll;
  }

  .site-header .main-nav {
    padding: 0.65rem 4%;
    gap: 0.65rem;
  }

  .site-menu-toggle {
    display: inline-flex;
  }

  .site-header .nav-left,
  .site-header .nav-right {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
  }

  .site-header.site-nav-open .nav-left,
  .site-header.site-nav-open .nav-right {
    display: flex;
  }

  .site-header .nav-sep {
    display: none;
  }

  .site-header .dropdown-content {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    max-height: none;
    box-shadow: none;
    border: 1px solid var(--lp-border);
    margin-top: 0.35rem;
  }

  .site-header .nav-call-to {
    width: 100%;
  }

  .topbar {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.5rem;
  }

  .toc-toggle {
    display: inline-flex;
    order: 0;
  }

  .doc-brand {
    order: 1;
  }

  .doc-brand .brand-text {
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .search {
    order: 2;
    grid-column: 1 / -1;
  }

  .search input {
    width: 100%;
    margin-left: 0;
    font-size: 16px; /* avoid iOS zoom */
    min-height: 2.75rem;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(20rem, 88vw);
    height: 100vh;
    height: 100dvh;
    z-index: 1070;
    transform: translateX(-105%);
    transition: transform 220ms ease;
    background: var(--bg-elevated);
    border-right: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding-top: max(1rem, env(safe-area-inset-top));
  }

  body.nav-open .sidebar {
    transform: none;
  }

  body.nav-open {
    overflow: hidden;
  }

  .sidebar-close {
    display: inline-flex;
  }

  .toc a {
    padding: 0.55rem 0.65rem;
    font-size: 0.9rem;
  }

  .backdrop {
    position: fixed;
    inset: 0;
    z-index: 1065;
    background: rgba(10, 16, 14, 0.55);
  }

  body.nav-open .backdrop {
    display: block;
  }

  .backdrop[hidden] {
    display: none;
  }

  body.nav-open .backdrop[hidden] {
    display: block;
  }

  .main {
    padding-top: 1rem;
  }

  .doc {
    padding: 1rem 0.9rem 1.5rem;
    border-radius: 8px;
    background: var(--bg-elevated);
  }

  .hero {
    margin-bottom: 1.5rem;
    padding-bottom: 1.25rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
    min-height: 2.75rem;
  }

  .callout {
    padding: 1rem;
    margin-bottom: 1.75rem;
  }

  .pillars {
    gap: 0.65rem;
  }

  .doc > h1,
  .doc section > h1 {
    margin-top: 2rem;
  }

  .doc img {
    margin: 0.85rem 0 1.1rem;
    border-radius: 4px;
  }

  .table-wrapper {
    margin-left: -0.25rem;
    margin-right: -0.25rem;
    border-radius: 4px;
  }

  table {
    font-size: 0.84rem;
  }

  th,
  td {
    padding: 0.5rem 0.55rem;
  }

  .search-panel {
    left: 0.75rem;
    right: 0.75rem;
    width: auto;
    top: calc(var(--chrome-gap) + 3.6rem);
    max-height: min(60vh, 24rem);
  }

  .site-footer {
    font-size: 0.88rem;
    padding: 2rem 1rem;
  }
}

/* Narrow phones */

@media (max-width: 480px) {
  :root {
    --page-pad: 0.55rem;
  }

  .doc-brand .brand-text {
    max-width: 9.5rem;
  }

  .doc {
    padding: 0.85rem 0.7rem 1.25rem;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
  }

  .hero-brand {
    font-size: 0.72rem;
    letter-spacing: 0.08em;
  }

  .hero h1 {
    font-size: 1.55rem;
  }

  .doc ul,
  .doc ol {
    padding-left: 1.05rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .doc,
  .btn,
  .sidebar {
    animation: none;
    transition: none;
  }
}