/* ==========================================================================
   Manage Lines — Design System
   Aesthetic: "Control-room blueprint" — deep ink navy, drafting grid,
   glacier cyan signal lines, one warm amber used only for alarms/blocks.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  --ink-950: #050A14;
  --ink-900: #070D18;
  --ink-850: #0B1424;
  --ink-800: #0F1B2F;
  --ink-700: #16243A;
  --ink-600: #213350;
  --line: #1E2D45;
  --line-strong: #2A3D5C;

  --text: #EEF3FA;
  --text-2: #A9B8CD;
  --text-3: #7D8FA9;

  --cyan: #5BE7E0;
  --cyan-2: #2FC4D2;
  --azure: #2E8BFF;
  --amber: #FFB547;
  --red: #FF6B6B;
  --ok: #5BE7A0;

  --grad: linear-gradient(120deg, var(--cyan) 0%, var(--azure) 100%);

  --font-sans: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", "Noto Sans", Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --s-1: .25rem; --s-2: .5rem; --s-3: .75rem; --s-4: 1rem; --s-5: 1.5rem;
  --s-6: 2rem; --s-7: 3rem; --s-8: 4.5rem; --s-9: 7rem;

  --r-sm: 6px; --r-md: 10px; --r-lg: 16px;
  --shadow-1: 0 1px 0 rgba(255,255,255,.03) inset, 0 12px 32px -16px rgba(0,0,0,.7);
  --shadow-2: 0 30px 80px -30px rgba(2,8,20,.9);

  --w-max: 1200px;
  --w-text: 64ch;

  --t-fast: 160ms; --t-med: 320ms; --t-slow: 700ms;
  --ease: cubic-bezier(.2,.7,.2,1);

  --header-h: 72px;
}

/* ---------- 2. Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body {
  margin: 0; background: var(--ink-900); color: var(--text);
  font-family: var(--font-sans); font-size: 1.0625rem; line-height: 1.65;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
body::before { /* drafting grid */
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: -1;
  background-image:
    linear-gradient(rgba(91,231,224,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91,231,224,.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3, h4 { line-height: 1.12; margin: 0 0 var(--s-4); letter-spacing: -.02em; font-weight: 700; }
h1 { font-size: clamp(2.2rem, 6vw, 4.4rem); letter-spacing: -.035em; }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.8rem); }
h3 { font-size: 1.2rem; letter-spacing: -.01em; }
p { margin: 0 0 var(--s-4); color: var(--text-2); }
ul { padding-left: 1.2em; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--cyan); color: var(--ink-900); }
.sr-only { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: 1rem; top: -100px; z-index: 200; background: var(--cyan); color: var(--ink-900); padding: .6rem 1rem; border-radius: var(--r-sm); font-weight: 600; }
.skip-link:focus { top: 1rem; }

/* ---------- 3. Layout ---------- */
.container { width: min(100% - 2.5rem, var(--w-max)); margin-inline: auto; }
.section { padding-block: var(--s-8); position: relative; }
@media (min-width: 900px) { .section { padding-block: var(--s-9); } }
.section--band { background: linear-gradient(180deg, var(--ink-850), var(--ink-900)); border-block: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: var(--s-7); }
.section-head--split { max-width: none; display: grid; gap: var(--s-5); }
@media (min-width: 900px) { .section-head--split { grid-template-columns: 1.1fr 1fr; align-items: end; } }
.lede { font-size: 1.15rem; color: var(--text-2); max-width: var(--w-text); }
.eyebrow {
  display: inline-flex; align-items: center; gap: .6rem; margin-bottom: var(--s-4);
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .18em; text-transform: uppercase; color: var(--cyan);
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; }
.grid { display: grid; gap: var(--s-5); }
.mono { font-family: var(--font-mono); }
.accent { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  min-height: 48px; padding: .75rem 1.35rem; border-radius: var(--r-sm);
  font: 600 .98rem/1 var(--font-sans); letter-spacing: .005em; cursor: pointer;
  border: 1px solid transparent; transition: transform var(--t-fast) var(--ease), background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  text-decoration: none !important;
}
.btn svg { width: 16px; height: 16px; transition: transform var(--t-fast) var(--ease); }
.btn:hover svg { transform: translateX(3px); }
.btn--primary { background: var(--cyan); color: var(--ink-950); }
.btn--primary:hover { background: #7FF0EA; transform: translateY(-1px); }
.btn--ghost { border-color: var(--line-strong); color: var(--text); background: rgba(255,255,255,.02); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn--sm { min-height: 40px; padding: .55rem 1rem; font-size: .9rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.link-arrow { display: inline-flex; align-items: center; gap: .4rem; font-weight: 600; font-size: .95rem; }
.link-arrow::after { content: "\2192"; transition: transform var(--t-fast) var(--ease); }
.link-arrow:hover { text-decoration: none; }
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- 5. Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  background: rgba(7,13,24,.72); backdrop-filter: saturate(140%) blur(14px); -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent; transition: border-color var(--t-med), background var(--t-med);
}
.site-header.is-scrolled { border-bottom-color: var(--line); background: rgba(7,13,24,.92); }
.nav { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--s-5); }
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand img { height: 38px; width: auto; }
.brand .brand-symbol { display: none; }
@media (max-width: 380px) { .brand .brand-full { display: none; } .brand .brand-symbol { display: block; height: 36px; } }
.nav-menu { display: flex; align-items: center; gap: var(--s-1); list-style: none; margin: 0; padding: 0; }
.nav-menu > li { position: relative; }
.nav-link, .nav-trigger {
  display: inline-flex; align-items: center; gap: .35rem; padding: .55rem .8rem; border-radius: var(--r-sm);
  color: var(--text-2); font: 500 .94rem/1 var(--font-sans); background: none; border: 0; cursor: pointer;
  transition: color var(--t-fast), background var(--t-fast);
}
.nav-link:hover, .nav-trigger:hover { color: var(--text); background: rgba(255,255,255,.04); text-decoration: none; }
.nav-link[aria-current="page"], .nav-trigger.is-active { color: var(--text); }
.nav-link[aria-current="page"]::after { content: ""; position: absolute; left: .8rem; right: .8rem; bottom: -2px; height: 2px; background: var(--cyan); border-radius: 2px; }
.nav-trigger svg { width: 12px; height: 12px; transition: transform var(--t-fast); }
.nav-trigger[aria-expanded="true"] svg { transform: rotate(180deg); }
.dropdown {
  position: absolute; top: calc(100% + 10px); left: -1rem; width: 360px; padding: var(--s-2);
  background: var(--ink-850); border: 1px solid var(--line-strong); border-radius: var(--r-md); box-shadow: var(--shadow-2);
  list-style: none; margin: 0; opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity var(--t-fast), transform var(--t-fast), visibility var(--t-fast);
}
.dropdown.is-open { opacity: 1; visibility: visible; transform: none; }
.dropdown a { display: block; padding: .6rem .8rem; border-radius: var(--r-sm); color: var(--text-2); font-size: .92rem; line-height: 1.35; }
.dropdown a:hover, .dropdown a:focus-visible { background: var(--ink-700); color: var(--text); text-decoration: none; }
.dropdown a.is-featured { color: var(--text); border: 1px solid var(--line-strong); margin-bottom: .35rem; }
.dropdown a.is-featured span { display: block; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .14em; color: var(--cyan); margin-bottom: .2rem; }
.nav-cta { margin-left: var(--s-3); }
.nav-toggle { display: none; width: 46px; height: 46px; border-radius: var(--r-sm); border: 1px solid var(--line-strong); background: transparent; color: var(--text); cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { display: block; width: 20px; height: 2px; background: currentColor; border-radius: 2px; position: relative; transition: transform var(--t-fast), background var(--t-fast); }
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; } .nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }
  .nav-panel {
    position: fixed; inset: var(--header-h) 0 0 0; background: var(--ink-900); border-top: 1px solid var(--line);
    padding: var(--s-5) 1.25rem var(--s-7); overflow-y: auto; display: none;
  }
  .nav-panel.is-open { display: block; }
  .nav-menu { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-menu > li { border-bottom: 1px solid var(--line); }
  .nav-link, .nav-trigger { width: 100%; justify-content: space-between; padding: 1rem .25rem; font-size: 1.05rem; min-height: 52px; }
  .nav-link[aria-current="page"]::after { display: none; }
  .nav-link[aria-current="page"] { color: var(--cyan); }
  .dropdown { position: static; width: auto; opacity: 1; visibility: visible; transform: none; display: none; box-shadow: none; margin-bottom: var(--s-3); }
  .dropdown.is-open { display: block; }
  .nav-cta { margin: var(--s-5) 0 0; width: 100%; }
  body.nav-open { overflow: hidden; }
}
@media (min-width: 1081px) { .nav-panel { display: flex; align-items: center; } }

/* no-JS fallback nav */
.static-nav { border-bottom: 1px solid var(--line); background: var(--ink-850); }
.static-nav ul { display: flex; flex-wrap: wrap; gap: .3rem 1.2rem; list-style: none; margin: 0; padding: .9rem 0; }
.static-nav a { color: var(--text-2); font-size: .92rem; }

/* ---------- 6. Hero ---------- */
.hero { position: relative; padding-block: var(--s-7) var(--s-8); overflow: hidden; }
@media (min-width: 900px) { .hero { padding-block: var(--s-8) var(--s-9); } }
.hero-grid { display: grid; gap: var(--s-7); align-items: center; }
@media (min-width: 1000px) { .hero-grid { grid-template-columns: 1.05fr 1fr; } }
.hero h1 { margin-bottom: var(--s-5); }
.hero h1 .line2 { display: block; color: var(--text-3); }
.hero .lede { margin-bottom: var(--s-6); }
.hero-meta { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: var(--s-6); padding: 0; list-style: none; }
.hero-meta li { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); border: 1px solid var(--line); padding: .35rem .6rem; border-radius: 4px; }
.hero-visual { position: relative; border: 1px solid var(--line); border-radius: var(--r-lg); background: radial-gradient(ellipse at 50% 40%, rgba(46,139,255,.10), transparent 70%), var(--ink-850); padding: var(--s-4); box-shadow: var(--shadow-2); }
.hero-visual figcaption { display: flex; justify-content: space-between; gap: 1rem; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--text-3); padding: .25rem .25rem .75rem; border-bottom: 1px dashed var(--line); margin-bottom: .5rem; }
.hero-visual figcaption b { color: var(--ok); font-weight: 500; }
.page-hero { padding-block: var(--s-7) var(--s-7); border-bottom: 1px solid var(--line); }
@media (min-width: 900px) { .page-hero { padding-block: var(--s-8); } }
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.6rem); max-width: 18ch; }
.breadcrumb { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .08em; color: var(--text-3); margin-bottom: var(--s-5); }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: .5rem; color: var(--line-strong); }
.breadcrumb a { color: var(--text-2); }

/* SVG animation classes */
.flow { stroke-dasharray: 4 8; animation: dash 1.6s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -24; } }
.pulse-dot { animation: pulse 2.4s var(--ease) infinite; transform-box: fill-box; transform-origin: center; }
@keyframes pulse { 0%,100% { opacity: .35; transform: scale(.85); } 50% { opacity: 1; transform: scale(1.15); } }
.scan { animation: scan 6s linear infinite; }
@keyframes scan { 0% { transform: translateY(0); opacity: 0; } 10% { opacity: .9; } 90% { opacity: .9; } 100% { transform: translateY(360px); opacity: 0; } }
.hero-node { transition: opacity var(--t-med); }
.hero-svg:hover .hero-node:not(:hover) { opacity: .55; }

/* ---------- 7. Cards ---------- */
.card {
  position: relative; display: flex; flex-direction: column; gap: var(--s-3);
  padding: var(--s-5); background: linear-gradient(180deg, rgba(255,255,255,.025), rgba(255,255,255,0)), var(--ink-850);
  border: 1px solid var(--line); border-radius: var(--r-md); box-shadow: var(--shadow-1);
  transition: border-color var(--t-med), transform var(--t-med) var(--ease);
}
.card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.card::before { content: ""; position: absolute; left: var(--s-5); right: var(--s-5); top: -1px; height: 1px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform var(--t-med) var(--ease); }
.card:hover::before { transform: scaleX(1); }
.card h3 { margin: 0; }
.card p { margin: 0; font-size: .97rem; }
.card .link-arrow { margin-top: auto; padding-top: var(--s-2); }
.card-num { font-family: var(--font-mono); font-size: .72rem; color: var(--text-3); letter-spacing: .12em; }
.icon-box { width: 46px; height: 46px; border-radius: var(--r-sm); display: grid; place-items: center; color: var(--cyan); background: rgba(91,231,224,.07); border: 1px solid rgba(91,231,224,.18); }
.icon-box svg { width: 22px; height: 22px; }
.card-top { display: flex; justify-content: space-between; align-items: flex-start; }

.services-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.service-feature {
  grid-column: 1 / -1; display: grid; gap: var(--s-5); padding: var(--s-6);
  border: 1px solid rgba(91,231,224,.3); background: radial-gradient(ellipse at 100% 0%, rgba(91,231,224,.10), transparent 60%), var(--ink-850);
}
@media (min-width: 900px) { .service-feature { grid-template-columns: 1.3fr 1fr; align-items: center; } .service-feature h3 { font-size: 1.7rem; } }
.tag-list { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: 0; padding: 0; }
.tag-list li { font-family: var(--font-mono); font-size: .72rem; padding: .3rem .55rem; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--text-2); }

/* Filter */
.filter-bar { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: var(--s-6); }
.filter-btn { font: 500 .88rem/1 var(--font-sans); padding: .7rem 1rem; min-height: 42px; border-radius: 999px; border: 1px solid var(--line-strong); background: transparent; color: var(--text-2); cursor: pointer; transition: all var(--t-fast); }
.filter-btn:hover { color: var(--text); border-color: var(--text-3); }
.filter-btn[aria-pressed="true"] { background: var(--cyan); color: var(--ink-950); border-color: var(--cyan); }
.is-hidden { display: none !important; }

/* Service detail blocks */
.service-detail { display: grid; gap: var(--s-5); padding-block: var(--s-7); border-top: 1px solid var(--line); }
@media (min-width: 900px) { .service-detail { grid-template-columns: 80px 1fr 1fr; gap: var(--s-6); } }
.service-detail h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .65rem; }
.check-list li { position: relative; padding-left: 1.6rem; color: var(--text-2); font-size: .98rem; }
.check-list li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; border: 1.5px solid var(--cyan); border-radius: 2px; transform: rotate(45deg); }
.deliverables { padding: var(--s-5); border: 1px dashed var(--line-strong); border-radius: var(--r-md); }
.deliverables h3 { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }

/* ---------- 8. Industries ---------- */
.industry-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; }
.industry { padding: var(--s-6) var(--s-5); border: 1px solid var(--line); margin: -1px 0 0 -1px; background: var(--ink-900); transition: background var(--t-med); position: relative; }
.industry:hover { background: var(--ink-850); }
.industry .idx { font-family: var(--font-mono); font-size: .72rem; color: var(--cyan); letter-spacing: .12em; display: block; margin-bottom: var(--s-4); }
.industry p { font-size: .96rem; margin: 0; }
.note { font-size: .88rem; color: var(--text-3); border-left: 2px solid var(--amber); padding-left: var(--s-3); margin-top: var(--s-5); }

/* ---------- 9. Why / Value ---------- */
.value-grid { display: grid; gap: var(--s-6) var(--s-7); }
@media (min-width: 720px) { .value-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .value-grid { grid-template-columns: repeat(3, 1fr); } }
.value { border-top: 1px solid var(--line-strong); padding-top: var(--s-4); }
.value h3 { display: flex; gap: .7rem; align-items: baseline; }
.value h3 span { font-family: var(--font-mono); font-size: .75rem; color: var(--cyan); font-weight: 500; }
.value p { font-size: .97rem; }

.split { display: grid; gap: var(--s-7); align-items: center; }
@media (min-width: 960px) { .split { grid-template-columns: 1fr 1fr; } .split--wide-left { grid-template-columns: 1.2fr 1fr; } }

/* ---------- 10. Methodology timeline ---------- */
.process { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: step; position: relative; }
.process li { position: relative; padding: 0 0 var(--s-6) 4.2rem; }
.process li::before { content: ""; position: absolute; left: 1.35rem; top: 2.8rem; bottom: 0; width: 1px; background: linear-gradient(var(--line-strong), var(--line)); }
.process li:last-child::before { display: none; }
.process .step-n { position: absolute; left: 0; top: 0; width: 2.75rem; height: 2.75rem; border-radius: 50%; display: grid; place-items: center; font-family: var(--font-mono); font-size: .85rem; color: var(--cyan); border: 1px solid rgba(91,231,224,.4); background: var(--ink-900); }
.process h3 { margin: .55rem 0 .4rem; }
.process p { font-size: .97rem; margin: 0; max-width: 46ch; }
@media (min-width: 1000px) {
  .process { grid-template-columns: repeat(5, 1fr); gap: var(--s-5); }
  .process li { padding: 4.2rem 0 0; }
  .process li::before { left: 3.2rem; right: calc(-1 * var(--s-5)); top: 1.375rem; bottom: auto; width: auto; height: 1px; background: var(--line-strong); }
  .process li::after { content: ""; position: absolute; left: 3.2rem; top: calc(1.375rem - 1px); height: 3px; width: 30px; background: var(--cyan); border-radius: 2px; opacity: .8; animation: travel 4s var(--ease) infinite; animation-delay: calc(var(--i, 0) * .5s); }
  .process li:last-child::after { display: none; }
  .process h3 { margin-top: 0; }
}
@keyframes travel { 0% { transform: translateX(0); opacity: 0; } 15% { opacity: .9; } 85% { opacity: .9; } 100% { transform: translateX(140px); opacity: 0; } }

/* ---------- 11. OT page components ---------- */
.ot-hero-visual svg text { font-family: var(--font-mono); }
.defense { display: grid; gap: var(--s-7); }
@media (min-width: 1000px) { .defense { grid-template-columns: 1fr 1fr; align-items: start; } }
.defense-list { list-style: none; padding: 0; margin: var(--s-5) 0; display: grid; gap: var(--s-4); }
.defense-list li { padding: var(--s-4) var(--s-5); border: 1px solid var(--line); border-radius: var(--r-md); background: var(--ink-850); }
.defense-list strong { display: block; color: var(--text); margin-bottom: .25rem; }
.defense-list span { color: var(--text-2); font-size: .96rem; }
.callout { border: 1px solid rgba(255,181,71,.35); background: rgba(255,181,71,.05); border-radius: var(--r-md); padding: var(--s-4) var(--s-5); color: var(--text); font-size: .98rem; }
.callout b { color: var(--amber); font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em; display: block; margin-bottom: .3rem; font-weight: 500; }

.zones { display: grid; gap: .7rem; font-family: var(--font-mono); position: relative; }
.zone { position: relative; border: 1px solid var(--line-strong); border-radius: var(--r-md); padding: 1rem 1.1rem; background: var(--ink-850); }
.zone small { display: block; font-size: .68rem; letter-spacing: .14em; color: var(--text-3); text-transform: uppercase; }
.zone strong { font-size: .95rem; letter-spacing: .02em; color: var(--text); font-weight: 600; }
.zone--it { border-style: dashed; }
.zone--it strong { color: var(--text-2); }
.zone--dmz { border-color: rgba(255,181,71,.55); background: linear-gradient(90deg, rgba(255,181,71,.07), transparent); }
.zone--scada { border-color: rgba(46,139,255,.45); }
.zone--control { border-color: rgba(91,231,224,.55); background: linear-gradient(90deg, rgba(91,231,224,.07), transparent); }
.zone-gap { height: 26px; display: flex; justify-content: center; position: relative; }
.zone-gap::before { content: ""; width: 1px; height: 100%; background: var(--line-strong); }
.packet { position: absolute; left: 50%; top: 0; width: 10px; height: 10px; margin-left: -5px; border-radius: 2px; background: var(--red); }
.zones .packet { animation: packet 3.6s var(--ease) infinite; top: 46px; }
@keyframes packet { 0% { transform: translateY(0); opacity: 0; } 15% { opacity: 1; } 45% { transform: translateY(60px); opacity: 1; } 55% { transform: translateY(60px) scale(1.6); opacity: 0; } 100% { opacity: 0; transform: translateY(60px); } }
.blocked { position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); font-size: .68rem; letter-spacing: .16em; color: var(--ink-950); background: var(--amber); padding: .25rem .5rem; border-radius: 3px; font-weight: 700; }
.zone .tags { font-size: .72rem; color: var(--text-3); margin-top: .3rem; }

/* Stack explorer */
.stack { display: grid; gap: var(--s-5); }
@media (min-width: 900px) { .stack { grid-template-columns: minmax(260px, 340px) 1fr; } }
.stack-tabs { display: grid; gap: .45rem; }
.stack-tab {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; text-align: left; width: 100%;
  padding: .95rem 1.1rem; border-radius: var(--r-sm); border: 1px solid var(--line); background: var(--ink-850); color: var(--text-2);
  font: 500 .95rem/1.3 var(--font-sans); cursor: pointer; transition: all var(--t-fast);
}
.stack-tab .lvl { font-family: var(--font-mono); font-size: .72rem; color: var(--text-3); letter-spacing: .08em; white-space: nowrap; }
.stack-tab:hover { border-color: var(--line-strong); color: var(--text); }
.stack-tab[aria-selected="true"] { border-color: var(--cyan); color: var(--text); background: linear-gradient(90deg, rgba(91,231,224,.1), var(--ink-850)); }
.stack-tab[aria-selected="true"] .lvl { color: var(--cyan); }
.stack-panel { border: 1px solid var(--line-strong); border-radius: var(--r-lg); padding: var(--s-6); background: radial-gradient(ellipse at 100% 0%, rgba(46,139,255,.08), transparent 60%), var(--ink-850); min-height: 300px; }
.stack-panel h3 { font-size: 1.6rem; }
.stack-panel .lvl-big { font-family: var(--font-mono); font-size: .8rem; letter-spacing: .14em; color: var(--cyan); display: block; margin-bottom: var(--s-3); }
.stack-panel[hidden] { display: none; }
.stack-panel .security-note { margin-top: var(--s-5); padding-top: var(--s-4); border-top: 1px dashed var(--line-strong); font-size: .94rem; }
.stack-panel .security-note b { color: var(--text); }
.no-js .stack-panel[hidden] { display: block; }

/* Signal flow */
.signal { list-style: none; margin: 0; padding: 0; display: grid; gap: .75rem; counter-reset: s; }
@media (min-width: 720px) { .signal { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .signal { grid-template-columns: repeat(7, 1fr); gap: .5rem; } }
.signal li { position: relative; padding: var(--s-4); border: 1px solid var(--line); border-radius: var(--r-md); background: var(--ink-850); transition: border-color var(--t-med), background var(--t-med); }
.signal li.is-live { border-color: var(--cyan); background: linear-gradient(180deg, rgba(91,231,224,.08), var(--ink-850)); }
.signal .n { font-family: var(--font-mono); font-size: .7rem; color: var(--cyan); letter-spacing: .12em; }
.signal h3 { font-size: 1rem; margin: .4rem 0 .35rem; }
.signal p { font-size: .88rem; margin: 0 0 .5rem; color: var(--text); }
.signal .dev { font-family: var(--font-mono); font-size: .7rem; color: var(--text-3); }

/* Ecosystem */
.eco { display: flex; flex-wrap: wrap; gap: .6rem; list-style: none; padding: 0; margin: 0; }
.eco li { font-family: var(--font-mono); font-size: .85rem; padding: .7rem 1rem; border: 1px solid var(--line-strong); border-radius: var(--r-sm); color: var(--text-2); background: var(--ink-850); transition: all var(--t-fast); }
.eco li:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- 12. Accordion ---------- */
.faq { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 1rem; text-align: left; padding: 1.25rem 0; background: none; border: 0; color: var(--text); font: 600 1.05rem/1.4 var(--font-sans); cursor: pointer; }
.faq-q::after { content: "+"; font-family: var(--font-mono); font-size: 1.3rem; color: var(--cyan); transition: transform var(--t-fast); }
.faq-q[aria-expanded="true"]::after { transform: rotate(45deg); }
.faq-a { padding: 0 0 1.25rem; max-width: 72ch; }
.faq-a[hidden] { display: none; }

/* ---------- 13. CTA band ---------- */
.cta-band { position: relative; overflow: hidden; border: 1px solid var(--line-strong); border-radius: var(--r-lg); padding: var(--s-7) var(--s-6); background: radial-gradient(ellipse at 0% 100%, rgba(91,231,224,.12), transparent 55%), radial-gradient(ellipse at 100% 0%, rgba(46,139,255,.12), transparent 50%), var(--ink-850); display: grid; gap: var(--s-5); }
@media (min-width: 900px) { .cta-band { grid-template-columns: 1.4fr auto; align-items: center; padding: var(--s-8) var(--s-7); } }
.cta-band h2 { margin-bottom: var(--s-3); }
.cta-band p { margin: 0; }

/* ---------- 14. Forms ---------- */
.form-wrap { display: grid; gap: var(--s-7); }
@media (min-width: 960px) { .form-wrap { grid-template-columns: 1fr 1.35fr; } }
.form { display: grid; gap: var(--s-4); padding: var(--s-6) var(--s-5); border: 1px solid var(--line-strong); border-radius: var(--r-lg); background: var(--ink-850); }
@media (min-width: 600px) { .form { grid-template-columns: 1fr 1fr; padding: var(--s-6); } .form .full { grid-column: 1 / -1; } }
.field { display: grid; gap: .4rem; }
.field label, .field legend { font-size: .9rem; font-weight: 600; color: var(--text); }
.field .opt { font-weight: 400; color: var(--text-3); font-size: .82rem; }
.field input, .field select, .field textarea {
  width: 100%; min-height: 48px; padding: .75rem .9rem; border-radius: var(--r-sm); border: 1px solid var(--line-strong);
  background: var(--ink-900); color: var(--text); font: 400 1rem/1.4 var(--font-sans); transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field select { appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--text-2) 50%), linear-gradient(135deg, var(--text-2) 50%, transparent 50%); background-position: calc(100% - 20px) 52%, calc(100% - 15px) 52%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 2.5rem; }
.field textarea { min-height: 150px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(91,231,224,.18); }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: var(--red); }
.field-error { color: #FF9B9B; font-size: .85rem; min-height: 0; }
.field-error:empty { display: none; }
.consent { display: flex; gap: .75rem; align-items: flex-start; font-size: .92rem; color: var(--text-2); }
.consent input { width: 20px; height: 20px; min-height: 0; margin-top: .2rem; accent-color: var(--cyan); flex-shrink: 0; }
.hp { position: absolute; left: -9999px; }
.form-status { border-radius: var(--r-sm); padding: var(--s-4); font-size: .95rem; }
.form-status:empty { display: none; }
.form-status.is-error { border: 1px solid rgba(255,107,107,.5); background: rgba(255,107,107,.07); color: var(--text); }
.form-status.is-warn { border: 1px solid rgba(255,181,71,.5); background: rgba(255,181,71,.07); color: var(--text); }
.form-status.is-ok { border: 1px solid rgba(91,231,160,.5); background: rgba(91,231,160,.07); color: var(--text); }
.form-status strong { display: block; margin-bottom: .25rem; }
.btn[disabled] { opacity: .6; cursor: progress; }
.contact-aside dl { margin: var(--s-5) 0 0; display: grid; gap: var(--s-4); }
.contact-aside dt { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }
.contact-aside dd { margin: .2rem 0 0; color: var(--text-2); }

/* ---------- 15. Insights ---------- */
.article { max-width: 760px; padding-block: var(--s-6); border-top: 1px solid var(--line); }
.article .meta { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--cyan); }
.article h2 { font-size: clamp(1.5rem, 2.8vw, 2rem); margin-top: var(--s-3); }

/* ---------- 16. Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--ink-950); padding-block: var(--s-8) var(--s-5); margin-top: var(--s-8); }
.footer-grid { display: grid; gap: var(--s-6); }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; } }
.footer-brand img { height: 38px; width: auto; margin-bottom: var(--s-4); }
.footer-brand p { font-size: .93rem; max-width: 36ch; }
.footer-col h2 { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--text-3); font-weight: 500; margin-bottom: var(--s-4); }
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.footer-col a { color: var(--text-2); font-size: .93rem; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { margin-top: var(--s-7); padding-top: var(--s-5); border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; font-size: .85rem; color: var(--text-3); }
.footer-bottom p { margin: 0; color: var(--text-3); }

/* ---------- 17. Back to top ---------- */
.to-top { position: fixed; right: 1.1rem; bottom: 1.1rem; z-index: 90; width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--line-strong); background: var(--ink-850); color: var(--cyan); cursor: pointer; display: grid; place-items: center; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all var(--t-med) var(--ease); }
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan); }
.to-top svg { width: 18px; height: 18px; }

/* ---------- 18. 404 ---------- */
.nf { min-height: 70dvh; display: grid; place-items: center; text-align: center; padding-block: var(--s-8); }
.nf .code { font-family: var(--font-mono); font-size: clamp(4rem, 16vw, 9rem); line-height: 1; color: transparent; -webkit-text-stroke: 1px var(--line-strong); letter-spacing: -.04em; margin-bottom: var(--s-4); }
.nf p { margin-inline: auto; max-width: 48ch; }
.nf .btn-row { justify-content: center; }

/* ---------- 19. Reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease); transition-delay: calc(var(--d, 0) * 80ms); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 20. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .js .reveal { opacity: 1; transform: none; }
  .zones .packet, .process li::after, .scan { display: none; }
}

/* ---------- 21. RTL readiness ---------- */
[dir="rtl"] .eyebrow::before { order: 2; }
[dir="rtl"] .link-arrow::after { content: "\2190"; }
[dir="rtl"] .check-list li { padding-left: 0; padding-right: 1.6rem; }
[dir="rtl"] .check-list li::before { left: auto; right: 0; }
[dir="rtl"] .note { border-left: 0; border-right: 2px solid var(--amber); padding-left: 0; padding-right: var(--s-3); }