/* EchoNav — shared design tokens and accessible foundations */
:root {
  --ink: #17232f;
  --muted: #596572;
  --blue: #075fcb;
  --brand: #0a84ff;
  --paper: #f7f8fa;
  --line: #dce1e6;
  --navy: #132b42;
  --radius: 18px;
  --color-primary: var(--blue);
  --color-secondary: var(--blue);
  --color-dark: var(--ink);
  --color-text: var(--ink);
  --color-text-light: #fff;
  --color-bg: #fff;
  --color-bg-alt: #f0f4f7;
  --color-success: #286b52;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 110px; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--ink); background: var(--paper); line-height: 1.6; -webkit-font-smoothing: antialiased; }
h1,h2,h3,p,ul,ol { margin: 0; }
h1,h2,h3 { line-height: 1.12; font-weight: 550; text-wrap: balance; }
h2 { font-size: clamp(2.2rem,3.4vw,3.5rem); letter-spacing: -.05em; }
h3 { font-size: 1.35rem; letter-spacing: -.025em; }
p { text-wrap: pretty; }
a { color: inherit; text-underline-offset: .24em; }
button,input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .7; }
img,video,svg { display: block; max-width: 100%; }
button,a,input,summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid #0867d9; outline-offset: 5px; border-radius: 3px; }
[hidden] { display: none !important; }
.container { width: min(1232px,calc(100% - 112px)); margin-inline: auto; }
.icon { width: 24px; height: 24px; flex-shrink: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: -100px; left: 24px; background: #fff; color: var(--ink); padding: 14px 20px; z-index: 100; border: 2px solid var(--blue); }
.skip-link:focus { top: 14px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 22px; min-height: 54px; border: 1px solid transparent; border-radius: 7px; padding: 14px 24px; font-size: .94rem; font-weight: 600; text-decoration: none; transition: background .2s,transform .2s,box-shadow .2s; }
.btn .icon { width: 19px; height: 19px; transition: transform .2s; }
.btn:hover .icon { transform: translateX(3px); }
.btn-primary,.btn-small { color: #fff; background: var(--blue); }
.btn-primary:hover,.btn-small:hover { background: #004fae; }
.btn-white { background: #fff; color: var(--ink); }
.btn-white:hover { background: #e9f2fc; }
.btn-small { padding: 11px 18px; min-height: 44px; font-size: .82rem; gap: 18px; }
.eyebrow,.article-kicker { color: var(--blue); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; font-weight: 650; margin-bottom: 22px; }
.muted { color: #677586; }
.section-space { padding-block: 106px; }
.section-heading { display: grid; grid-template-columns: 1.2fr 1fr; align-items: end; gap: 100px; margin-bottom: 60px; }
.section-lead { color: var(--muted); font-size: 1.03rem; line-height: 1.8; max-width: 470px; }

/* Header and mobile navigation */
.site-header { background: var(--paper); position: sticky; top: 0; z-index: 30; border-bottom: 1px solid transparent; }
.site-header > .container { display: flex; justify-content: space-between; align-items: center; gap: 32px; min-height: 90px; }
.logo { display: inline-flex; gap: 11px; align-items: center; color: var(--ink); text-decoration: none; font-size: 1.55rem; font-weight: 700; letter-spacing: -.07em; flex-shrink: 0; white-space: nowrap; }
.logo-img { width: 38px; height: 38px; border-radius: 10px; object-fit: cover; }
.brand-dot { color: var(--brand); }
.site-nav { order: 1; display: flex; gap: 32px; margin-left: auto; }
.site-nav a { font-size: .84rem; font-weight: 500; color: #465464; text-decoration: none; padding-block: 12px; }
.site-nav a:hover { color: var(--blue); }
.header-actions { order: 2; display: flex; gap: 30px; align-items: center; }
.lang-switcher { display: flex; align-items: center; gap: 0; font-size: .75rem; color: #768190; }
.lang-switcher button { background: none; border: 0; min-width: 36px; min-height: 44px; padding: 6px; font-size: .75rem; color: #596572; }
.lang-switcher button[aria-pressed=true] { color: var(--ink); font-weight: 750; text-decoration: underline; text-underline-offset: 5px; }
.menu-toggle { background: transparent; color: var(--ink); border: 1px solid var(--line); border-radius: 6px; min-height: 44px; padding: 8px 11px; display: none; align-items: center; gap: 9px; font-size: .82rem; }
.menu-lines { width: 16px; height: 10px; border-top: 1px solid; border-bottom: 1px solid; }

/* Hero: photography is decorative; the content is complete without it. */
.hero { margin: 0 28px; min-height: 648px; position: relative; overflow: hidden; border-radius: 17px; isolation: isolate; color: #fff; background: #172c3c; }
.hero-picture,.hero-shade { position: absolute; inset: 0; z-index: -2; }
.hero-picture img { width: 100%; height: 100%; object-fit: cover; object-position: center 58%; }
.hero-shade { z-index: -1; background: linear-gradient(90deg,rgba(8,25,40,.86),rgba(8,25,40,.68) 44%,rgba(8,25,40,.08) 78%),linear-gradient(0deg,rgba(8,25,40,.36),transparent 25%); }
.hero-content { padding: 72px 0 100px; width: min(1232px,calc(100% - 56px)); margin-inline: auto; }
.hero-eyebrow { display: flex; gap: 10px; align-items: center; text-transform: uppercase; font-size: .7rem; font-weight: 600; letter-spacing: .15em; margin-bottom: 34px; }
.status-dot { background: #91c3ff; width: 6px; height: 6px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
.hero h1 { font-size: clamp(2.8rem,4.9vw,4.8rem); letter-spacing: -.06em; font-weight: 500; max-width: 780px; line-height: 1.08; }
.hero h1 > span { display: block; }
.hero-title-soft { color: #d0e4f9; }
.hero-subtitle { margin-top: 26px; max-width: 475px; font-size: 1.02rem; line-height: 1.8; color: #e8edf2; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 34px; }
.hero-secondary { display: inline-flex; align-items: center; gap: 16px; font-size: .87rem; text-decoration: none; min-height: 48px; }
.hero-secondary:hover { text-decoration: underline; }
.hero-status { margin-top: 26px; font-size: .71rem; display: flex; align-items: center; gap: 9px; color: #e5eaf0; }
.hero-status .status-dot { width: 5px; height: 5px; background: #cbd8e3; }
.hero-bottom { position: absolute; bottom: 27px; inset-inline: 30px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.hero-bottom p { font-size: .65rem; text-align: right; color: #fff; background: #132b42b3; padding: 4px 8px; border-radius: 4px; }
.hero-scroll { width: 34px; height: 34px; border: 1px solid #ffffff60; border-radius: 50%; text-align: center; line-height: 30px; }
.hero :focus-visible,.signal-visual :focus-visible { outline-color: #fff; }
.principles { display: grid; grid-template-columns: .95fr 1.12fr 1.15fr; padding-block: 29px; border-bottom: 1px solid var(--line); gap: 35px; }
.principles > div { display: flex; gap: 13px; align-items: center; font-size: .78rem; color: #4b5d6f; }
.principles .icon { color: #506e8c; width: 20px; height: 20px; }
.principles > div + div { border-left: 1px solid var(--line); padding-left: 35px; }

/* Experience */
.steps-grid { list-style: none; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 42px; padding: 0; }
.step { border-top: 1px solid #bfcbd6; padding-top: 24px; }
.step-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 40px; }
.step-number { font-size: .76rem; font-variant-numeric: tabular-nums; color: var(--muted); }
.step-top .icon { color: var(--blue); width: 29px; height: 29px; }
.step h3 { margin-bottom: 14px; }
.step > p { color: var(--muted); font-size: .93rem; line-height: 1.8; max-width: 340px; }
.signal-section { background: #edf1f4; padding-block: 92px; }
.signal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; align-items: center; }
.signal-visual { border-radius: var(--radius); background: var(--navy); color: #fff; padding: 30px; overflow: hidden; }
.signal-visual-top { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.mini-brand { display: flex; gap: 8px; font-size: .88rem; font-weight: 600; align-items: center; }
.mini-brand .icon { color: #8fc5ff; width: 21px; }
.visual-label { color: #c4d0dd; font-size: .65rem; }
.radar-scene { position: relative; height: 205px; margin: 25px auto 10px; width: min(100%,360px); overflow: hidden; }
.radar-ring { position: absolute; left: 50%; top: 125px; transform: translate(-50%,-50%); border-radius: 50%; border: 1px solid #6fa5d142; }
.ring-one { width: 108px; height: 108px; }
.ring-two { width: 210px; height: 210px; }
.ring-three { width: 310px; height: 310px; }
.radar-axis { position: absolute; left: 50%; top: 6px; height: 120px; border-left: 1px dashed #78abd46b; }
.radar-phone { position: absolute; width: 48px; height: 62px; display: grid; place-items: center; left: 50%; top: 124px; transform: translate(-50%,-50%); border-radius: 12px; background: #254963; border: 1px solid #7da4c2; }
.radar-phone .icon { width: 28px; height: 28px; color: #e3efff; }
.radar-dot { position: absolute; width: 13px; height: 13px; border: 3px solid #d8eeff; background: #79b9ff; box-shadow: 0 0 0 7px #0a84ff22; border-radius: 50%; top: 21px; left: calc(50% - 6px); transition: left .45s,top .45s; }
.radar-dot[data-direction=left] { left: 24%; top: 70px; }
.radar-dot[data-direction=right] { left: 76%; top: 70px; }
.signal-caption { text-align: center; }
.signal-caption p { font-size: 1.7rem; letter-spacing: -.03em; line-height: 1.2; margin: 16px 0 9px; }
.signal-caption > span { color: #b9c9d8; font-size: .76rem; }
.audio-bars { display: flex; gap: 4px; height: 20px; justify-content: center; align-items: center; color: #95c6ff; }
.audio-bars i { display: block; width: 3px; height: 8px; background: currentColor; border-radius: 2px; }
.audio-bars i:nth-child(2),.audio-bars i:nth-child(4) { height: 15px; }
.audio-bars i:nth-child(3) { height: 22px; }
.signal-visual.is-changing .audio-bars i { animation: sound .5s ease-in-out 2 alternate; }
.direction-controls { display: flex; justify-content: center; gap: 7px; margin: 29px 0 18px; }
.direction-controls button { border: 1px solid #6d879f; color: #dfe8f0; background: transparent; border-radius: 6px; min-height: 44px; padding: 8px 14px; font-size: .75rem; transition: background .2s; }
.direction-controls button[aria-pressed=true] { background: #e2efff; color: #132b42; border-color: #e2efff; }
.direction-controls button:hover { border-color: #fff; }
.visual-note { color: #b7c7d6; text-align: center; font-size: .64rem; }
.signal-copy h2 { margin-bottom: 24px; }
.benefit-list { list-style: none; padding: 0; margin-top: 28px; }
.benefit-list li { display: flex; gap: 20px; padding: 19px 0; border-bottom: 1px solid #d1d9e1; }
.benefit-list li:last-child { border-bottom: 0; }
.benefit-list .icon { color: var(--blue); width: 22px; margin-top: 1px; }
.benefit-list h3 { font-size: 1rem; margin-bottom: 6px; }
.benefit-list p { font-size: .87rem; color: var(--muted); line-height: 1.7; }

/* Transparent project progress */
.development-aside { padding-bottom: 4px; }
.beta-badge { display: inline-flex; align-items: center; gap: 8px; color: #285375; background: #e6eff7; padding: 6px 11px; border-radius: 5px; font-size: .7rem; margin-bottom: 17px; }
.beta-badge .status-dot { background: #3779a8; }
.milestones { display: grid; grid-template-columns: 1fr 1fr .85fr; gap: 42px; }
.milestones > article { border-top: 1px solid var(--line); padding: 26px 0; }
.milestone-state { display: flex; align-items: center; gap: 7px; color: #2d6754; font-size: .72rem; margin-bottom: 23px; }
.milestone-state .icon { width: 16px; height: 16px; }
.milestone-state.upcoming { color: #626876; }
.milestones h3 { font-size: 1.23rem; margin-bottom: 15px; }
.milestones article > p:last-child { color: var(--muted); font-size: .9rem; line-height: 1.8; }
.milestones .scope-panel { background: #eaf0f5; border: 0; border-radius: 10px; padding: 24px 28px; }
.scope-panel .eyebrow { margin-bottom: 10px; font-size: .65rem; }
.scope-value { font-size: 3.1rem; font-weight: 500; letter-spacing: -.06em; line-height: 1.3; margin-bottom: 7px; }
.scope-value span { font-size: 1.3rem; color: #526579; }
.honest-note { display: flex; gap: 13px; align-items: center; margin-top: 32px; padding-top: 26px; border-top: 1px solid var(--line); color: #596572; font-size: .8rem; }
.honest-note .icon { width: 19px; color: #597185; }

/* Editorial resources, FAQ and newsletter */
.resources { background: #fff; }
.section-heading.compact { margin-bottom: 42px; }
.resources-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 66px; align-items: start; }
.video-panel video { width: 100%; aspect-ratio: 16/9; object-fit: cover; background: var(--navy); border-radius: 11px; }
.video-caption { margin-top: 20px; }
.video-caption h3 { font-size: 1.13rem; margin-bottom: 9px; }
.video-caption p,.transcript { font-size: .76rem; color: var(--muted); }
.transcript { margin-top: 12px; }
.transcript summary { cursor: pointer; color: var(--blue); min-height: 44px; padding-block: 10px; }
.transcript p { padding-bottom: 12px; }
.resource-link { display: flex; align-items: start; gap: 20px; padding: 29px 0; text-decoration: none; border-top: 1px solid var(--line); }
.resource-link:first-child { padding-top: 20px; }
.resource-link .eyebrow { font-size: .64rem; margin-bottom: 15px; }
.resource-link h3 { font-size: 1.5rem; margin-bottom: 13px; }
.resource-link p:last-child { font-size: .88rem; color: var(--muted); max-width: 370px; }
.circle-arrow { flex-shrink: 0; border: 1px solid var(--line); width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; transition: background .2s,color .2s; }
.circle-arrow .icon { width: 17px; height: 17px; }
.resource-link:hover .circle-arrow { background: var(--ink); color: #fff; }
.resource-link:hover h3 { color: var(--blue); }
.faq-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; }
.faq h2 { font-size: clamp(2rem,2.8vw,2.8rem); margin-bottom: 25px; }
.faq-grid > div > p:not(.eyebrow) { font-size: .9rem; color: var(--muted); margin-bottom: 10px; }
.text-link { display: inline-flex; gap: 12px; align-items: center; font-size: .9rem; color: var(--blue); min-height: 44px; }
.text-link .icon { width: 15px; height: 15px; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:first-child { border-top: 1px solid var(--line); }
.faq-item summary { cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 0; font-size: .95rem; font-weight: 500; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-plus { width: 13px; height: 13px; position: relative; flex-shrink: 0; }
.faq-plus::before,.faq-plus::after { content: ""; position: absolute; background: #4d6073; }
.faq-plus::before { width: 13px; height: 1px; top: 6px; }
.faq-plus::after { height: 13px; width: 1px; left: 6px; transition: transform .2s; }
.faq-item[open] .faq-plus::after { transform: rotate(90deg); }
.faq-item > p { color: var(--muted); font-size: .9rem; line-height: 1.8; padding: 0 30px 24px 0; }
.signup-section { padding: 65px 0; background: #e6eff8; border-top: 1px solid #d2e0ee; }
.signup-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: center; }
.signup-section .eyebrow { margin-bottom: 18px; }
.signup-section h2 { font-size: 2.7rem; margin-bottom: 16px; }
.signup-grid > div > p:last-child { max-width: 430px; font-size: .95rem; color: #526174; }
.signup-form label { display: block; font-size: .78rem; font-weight: 600; margin-bottom: 10px; }
.signup-row { display: flex; gap: 8px; }
.signup-row input { border: 1px solid #bdcddd; background: #fff; color: var(--ink); border-radius: 7px; min-height: 54px; padding: 14px 16px; width: 100%; min-width: 0; font-size: .91rem; }
.signup-row input::placeholder { color: #6a7684; }
.signup-row input[aria-invalid=true] { border: 2px solid #ad2837; }
.signup-row .btn { white-space: nowrap; padding-inline: 17px; gap: 12px; font-size: .8rem; }
.signup-privacy { color: #506174; font-size: .7rem; margin-top: 13px; line-height: 1.7; }
.form-error { color: #a31b2c; font-size: .8rem; margin-top: 6px; }
.form-error:empty,.form-status:empty { display: none; }
.form-status { padding: 13px 15px; margin-top: 15px; font-size: .86rem; border-radius: 6px; }
.form-status.error { background: #fff2f3; color: #912135; border: 1px solid #c26879; }
.form-status.success { background: #e1f1e6; color: #245a37; border: 1px solid #6c967a; }
.site-footer { padding: 48px 0 20px; background: var(--paper); }
.footer-content { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.footer-brand p { color: var(--muted); font-size: .8rem; margin-top: 10px; }
.footer-links { padding: 0; list-style: none; display: flex; align-items: center; flex-wrap: wrap; gap: 30px; }
.footer-links a { display: inline-flex; gap: 8px; align-items: center; min-height: 44px; font-size: .8rem; text-decoration: none; color: #47586a; }
.footer-links a:hover { color: var(--blue); text-decoration: underline; }
.footer-links .icon { width: 14px; height: 14px; }
.footer-bottom { margin-top: 35px; border-top: 1px solid var(--line); padding-top: 21px; display: flex; justify-content: space-between; gap: 24px; font-size: .65rem; color: #667280; }
.back-top { text-decoration: none; min-height: 30px; }

/* Shared article layouts (all existing public routes remain available). */
.article-page { padding-block: 50px 80px; }
.article-content { max-width: 1040px; margin-inline: auto; }
.article-hero { padding: 36px 0 55px; border-bottom: 1px solid var(--line); }
.article-hero-grid { display: grid; grid-template-columns: 1fr 300px; gap: 50px; align-items: start; }
.tech-article h1,.article-main-title { font-size: clamp(2.3rem,4.5vw,4rem); letter-spacing: -.055em; margin-bottom: 25px; }
.article-lead { font-size: 1.15rem; line-height: 1.8; color: var(--muted); max-width: 790px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 25px; font-size: .78rem; color: #526477; }
.article-meta span { padding: 5px 10px; background: #e9eef3; border-radius: 4px; }
.article-summary { padding: 24px; border: 1px solid var(--line); border-radius: 10px; background: #fff; font-size: .88rem; }
.article-summary h2 { font-size: 1.2rem; margin-bottom: 15px; }
.article-summary ul,.article-checklist { padding-left: 20px; }
.article-summary li,.article-checklist li { margin-bottom: 9px; }
.article-section,.article-band { padding: 40px 0; }
.article-section + .article-section { border-top: 1px solid var(--line); }
.article-container { max-width: 820px; margin-inline: auto; }
.article-section h2,.article-band h2 { font-size: 1.85rem; margin-bottom: 22px; }
.article-section h3,.article-band h3 { font-size: 1.15rem; margin: 24px 0 14px; }
.article-section p,.article-band p { color: #455467; margin-bottom: 16px; line-height: 1.85; }
.article-section a:not(.btn),.article-band a:not(.btn) { color: var(--blue); overflow-wrap: anywhere; }
.article-section ul,.article-band ul { padding-left: 22px; color: #455467; }
.article-band { background: #eaf0f5; padding-inline: 28px; border-radius: 12px; }
.article-nav,.article-header-actions { display: flex; align-items: center; gap: 20px; }
.article-nav a { font-size: .84rem; text-decoration: none; min-height: 44px; display: flex; align-items: center; color: #465464; }
.article-lang-switcher { display: flex; gap: 4px; }
.article-lang-switcher button { min-width: 40px; min-height: 44px; background: transparent; border: 0; border-radius: 5px; color: var(--ink); font-size: .78rem; }
.article-lang-switcher button[aria-pressed=true] { background: #e1ecf8; color: #0759bc; font-weight: 700; }
.architecture-flow,.validation-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 15px; margin: 25px 0; }
.architecture-flow { grid-template-columns: repeat(4,minmax(0,1fr)); }
.architecture-flow > div,.validation-grid > div { border: 1px solid var(--line); background: #fff; padding: 20px; border-radius: 8px; font-size: .87rem; }
.architecture-flow span { display: block; color: var(--blue); margin-bottom: 14px; }
.architecture-flow strong,.validation-grid strong { display: block; font-size: 1.03rem; margin-bottom: 10px; }
.logic-block { background: var(--navy); border-radius: 9px; color: #e4eff9; padding: 24px; overflow-x: auto; font-size: .85rem; margin: 25px 0; }
.article-two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; }
.article-share { padding: 40px; background: var(--navy); color: #fff; border-radius: 12px; margin-top: 30px; }
.article-share h2 { font-size: 2rem; margin-bottom: 18px; }
.article-share p { color: #d6e1ed; }
.share-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 25px; }
.btn-secondary { background: #fff; color: var(--ink); }
.technical-page .site-nav { margin-left: 0; }
.technical-page .site-footer > .container > p { font-size: .8rem; color: var(--muted); }

/* Motion is a progressive enhancement. Content stays visible without JavaScript. */
@keyframes appear { from { opacity: .3; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@keyframes sound { to { transform: scaleY(.4); } }
.reveal.is-visible { animation: appear .65s cubic-bezier(.2,.7,.25,1) both; }
.hero-content { animation: appear .75s ease-out both; }

@media (min-width:1500px) { .hero-content { width: 1232px; } .hero { min-height: 710px; } .hero-content { padding-top: 95px; } }
@media (max-width:1100px) {
  .container { width: calc(100% - 72px); }
  .site-header > .container { gap: 22px; }
  .site-nav { gap: 20px; }
  .header-actions { gap: 16px; }
  .header-cta { display: none; }
  .hero-content { width: calc(100% - 72px); }
  .hero h1 { font-size: 3.9rem; max-width: 660px; }
  .section-heading { gap: 55px; }
  .signal-grid { gap: 50px; }
  .signup-grid { gap: 45px; }
  .signup-row { flex-direction: column; }
  .signup-row .btn { align-self: start; }
  .principles { gap: 20px; }
  .principles > div + div { padding-left: 20px; }
  .milestones { gap: 26px; }
}
@media (max-width:760px) {
  html { scroll-padding-top: 98px; }
  .container { width: calc(100% - 40px); }
  .site-header > .container { min-height: 76px; flex-wrap: wrap; gap: 0; padding-block: 13px; }
  .logo { font-size: 1.35rem; gap: 8px; }
  .logo-img { width: 33px; height: 33px; border-radius: 8px; }
  .header-actions { gap: 10px; margin-left: auto; }
  .menu-toggle:not([hidden]) { display: inline-flex; }
  .site-nav { order: 3; width: 100%; margin: 12px 0 0; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 10px; gap: 14px; }
  .site-nav a { padding-block: 9px; font-size: .8rem; }
  .js .site-nav:not(.is-open) { display: none; }
  .technical-page .site-nav { display: flex; }
  .hero { margin: 0 12px; min-height: 710px; border-radius: 12px; }
  .hero-picture img { object-position: 70% center; }
  .hero-shade { background: linear-gradient(90deg,rgba(8,25,40,.79),rgba(8,25,40,.33)),linear-gradient(0deg,rgba(8,25,40,.32),rgba(8,25,40,.25)); }
  .hero-content { padding: 50px 24px 96px; width: 100%; }
  .hero-eyebrow { font-size: .59rem; letter-spacing: .1em; margin-bottom: 34px; }
  .hero h1 { font-size: clamp(2.6rem,8.2vw,3.8rem); letter-spacing: -.057em; line-height: 1.08; max-width: 580px; }
  .hero-subtitle { font-size: .95rem; line-height: 1.85; max-width: 430px; margin-top: 26px; }
  .hero-actions { flex-wrap: wrap; gap: 9px 22px; margin-top: 29px; }
  .hero-actions .btn { min-height: 51px; padding: 13px 19px; font-size: .84rem; gap: 25px; }
  .hero-secondary { font-size: .8rem; }
  .hero-status { font-size: .62rem; line-height: 1.8; max-width: 245px; margin-top: 24px; align-items: baseline; }
  .hero-bottom { inset-inline: 22px; bottom: 22px; }
  .hero-bottom p { max-width: 230px; font-size: .59rem; }
  .principles { grid-template-columns: 1fr; padding: 26px 0; gap: 18px; }
  .principles > div { font-size: .77rem; gap: 14px; }
  .principles > div + div { border-left: 0; padding-left: 0; }
  .principles .icon { width: 18px; height: 18px; }
  .section-space { padding-block: 65px; }
  .section-heading { grid-template-columns: 1fr; gap: 26px; margin-bottom: 38px; }
  h2 { font-size: 2.4rem; }
  .eyebrow { font-size: .65rem; margin-bottom: 19px; }
  .section-lead { font-size: .96rem; }
  .steps-grid { grid-template-columns: 1fr; gap: 30px; }
  .step-top { margin-bottom: 20px; }
  .step h3 { font-size: 1.3rem; }
  .step > p { max-width: none; }
  .signal-grid { grid-template-columns: 1fr; gap: 42px; }
  .signal-copy { order: -1; }
  .signal-visual { padding: 24px 20px; }
  .radar-scene { height: 195px; }
  .signal-caption p { font-size: 1.55rem; }
  .direction-controls button { padding: 8px 12px; }
  .milestones { grid-template-columns: 1fr; gap: 8px; }
  .milestones article:not(.scope-panel) { padding-bottom: 30px; }
  .milestones .scope-panel { margin-top: 15px; }
  .honest-note { align-items: start; font-size: .77rem; }
  .honest-note .icon { margin-top: 3px; }
  .resources-grid { grid-template-columns: 1fr; gap: 34px; }
  .faq-grid { grid-template-columns: 1fr; gap: 27px; }
  .faq-item summary { font-size: .89rem; }
  .signup-section { padding: 48px 0; }
  .signup-grid { grid-template-columns: 1fr; gap: 31px; }
  .signup-section h2 { font-size: 2.3rem; }
  .signup-row .btn { width: 100%; justify-content: space-between; }
  .signup-row input { font-size: 1rem; }
  .signup-privacy { font-size: .74rem; }
  .footer-content { flex-direction: column; align-items: start; gap: 22px; }
  .footer-links { gap: 6px 25px; }
  .footer-bottom { flex-wrap: wrap; gap: 12px; font-size: .65rem; }
  .footer-bottom p:nth-child(2) { width: 100%; order: 3; }
  .article-header-actions { margin-left: auto; gap: 10px; }
  .article-nav { gap: 13px; }
  .article-nav a { font-size: .72rem; }
  .article-nav a:not(:first-child) { display: none; }
  .article-page { padding-top: 20px; }
  .article-hero-grid,.architecture-flow,.validation-grid,.article-two-columns { grid-template-columns: 1fr; }
  .article-hero-grid { gap: 25px; }
  .article-summary { padding: 20px; }
  .article-section,.article-band { padding-block: 30px; }
  .article-band { padding-inline: 18px; }
  .article-share { padding: 26px 20px; }
  .share-actions .btn { width: 100%; }
}
@media (max-width:370px) {
  .hero-content { padding-inline: 20px; }
  .hero h1 { font-size: 2.52rem; }
  .hero { min-height: 740px; }
  .header-actions { gap: 3px; }
  .menu-toggle { padding-inline: 8px; }
  .lang-switcher button { min-width: 30px; }
  .article-header-actions { gap: 4px; }
  .article-nav a { font-size: .68rem; }
  .article-lang-switcher button { min-width: 32px; }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { animation: none !important; transition: none !important; }
}
@media (forced-colors:active) {
  .hero-shade { background: Canvas; }
  .hero,.hero-title-soft,.hero-subtitle,.hero-status,.hero-bottom p { color: CanvasText; }
  .btn,.signal-visual,.radar-phone,.direction-controls button { border: 1px solid ButtonText; }
  .status-dot,.radar-dot { background: CanvasText; }
}

/* Compact article navigation remains readable on narrow screens. */
@media (max-width:760px) {
  .article-header-actions .article-nav { order: 0; width: auto; margin: 0; padding: 0; border: 0; }
  .technical-page .site-header > .container > .article-nav { width: auto; margin: 0; padding: 0; border: 0; }
}