:root {
  --ink: #11141b;
  --ink-soft: #4d5563;
  --paper: #f7f6f2;
  --paper-2: #eeece6;
  --line: #d8d6cf;
  --coral: #e04a5d;
  --mint: #1dbf9f;
  --blue: #4569d4;
  --white: #fff;
  --max: 1180px;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "PingFang TC", "Noto Sans", sans-serif;
  --display: "Arial Narrow", "Avenir Next Condensed", var(--sans);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--mint); outline-offset: 4px; }

.site-header { position: absolute; z-index: 10; inset: 0 0 auto; display: flex; align-items: center; gap: 28px; max-width: var(--max); margin: 0 auto; padding: 22px 24px; color: var(--white); }
.wordmark { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; letter-spacing: -.04em; font-size: 1.18rem; white-space: nowrap; }
.brand-icon { width: 30px; height: 30px; flex: 0 0 auto; object-fit: cover; border-radius: 8px; }
.wordmark span { color: #ff98a7; }
.primary-nav { display: flex; gap: 18px; margin-right: auto; font-size: .78rem; color: rgba(255,255,255,.74); }
.primary-nav a:hover { color: var(--white); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.locale-picker { position: relative; z-index: 40; }
.locale-trigger { display: inline-flex; align-items: center; gap: 7px; min-width: 76px; padding: 7px 10px; color: var(--ink); border: 1px solid rgba(255,255,255,.34); border-radius: 999px; background: var(--white); font: inherit; font-size: .7rem; font-weight: 800; cursor: pointer; }
.locale-trigger-chevron { color: #596271; font-size: .86rem; line-height: 1; }
.locale-menu { position: absolute; top: calc(100% + 8px); right: 0; width: 242px; max-height: 360px; padding: 6px; overflow-y: auto; border: 1px solid rgba(17,20,27,.14); border-radius: 10px; background: var(--white); box-shadow: 0 18px 38px rgba(0,0,0,.24); }
.locale-option { display: grid; grid-template-columns: 25px minmax(0,1fr) 18px; gap: 8px; align-items: center; width: 100%; padding: 8px 9px; color: var(--ink); border: 0; border-radius: 6px; background: transparent; font: inherit; font-size: .78rem; text-align: left; cursor: pointer; }
.locale-option:hover, .locale-option.is-active { background: #eef1f8; }
.locale-option-check { color: var(--coral); font-weight: 900; opacity: 0; }
.locale-option.is-active .locale-option-check { opacity: 1; }
.header-cta { display: inline-flex; align-items: center; gap: 7px; padding: 8px 13px; border: 1px solid rgba(255,255,255,.65); border-radius: 5px; font-size: .76rem; font-weight: 700; }
.header-cta:hover { color: var(--ink); background: var(--white); }

.about-page, .contact-page { min-height: 100vh; color: var(--ink); background: var(--paper); }
.about-hero, .contact-hero { color: var(--white); background: radial-gradient(circle at 84% 20%, rgba(69,105,212,.3), transparent 36%), radial-gradient(circle at 12% 82%, rgba(29,191,159,.13), transparent 34%), var(--ink); }
.about-hero-inner, .contact-hero-inner { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 126px 0 112px; }
.about-kicker, .contact-kicker { margin: 0 0 18px; color: var(--mint); font-size: .72rem; font-weight: 800; letter-spacing: .18em; }
.about-hero h1, .contact-hero h1 { max-width: 840px; margin: 0; font-family: var(--display); font-size: clamp(3.3rem, 7vw, 6.9rem); line-height: .94; letter-spacing: -.065em; }
.about-hero h1 span { color: #ff98a7; }
.about-hero-lede, .contact-hero-lede { max-width: 760px; margin: 28px 0 0; color: rgba(255,255,255,.77); font-size: 1.1rem; }
.about-section, .contact-section { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 100px 0; }
.about-section.alt, .contact-section.alt { width: 100%; max-width: none; padding-inline: max(24px, calc((100% - var(--max)) / 2 + 24px)); background: var(--paper-2); }
.about-section h2, .contact-section h2 { margin: 0 0 16px; font-family: var(--display); font-size: clamp(2.2rem, 4.4vw, 4.5rem); line-height: .98; letter-spacing: -.055em; }
.about-section p, .contact-section p { color: var(--ink-soft); font-size: 1rem; }
.about-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; margin-top: 42px; }
.about-card, .contact-card { padding: 25px 23px; border: 1px solid var(--line); background: var(--white); }
.about-card h3, .contact-card h3 { margin: 0 0 10px; font-size: 1.2rem; }
.about-card p, .contact-card p { margin: 0; font-size: .92rem; }
.about-principles { display: grid; grid-template-columns: minmax(0,.78fr) minmax(0,1.22fr); gap: 64px; align-items: start; }
.principle-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.principle-item { display: grid; grid-template-columns: 54px minmax(0,1fr); gap: 18px; padding: 21px 0; border-bottom: 1px solid var(--line); }
.principle-item b { color: var(--coral); font-size: .75rem; letter-spacing: .1em; }
.principle-item h3 { margin: 0 0 6px; font-size: 1.15rem; }
.principle-item p { margin: 0; font-size: .9rem; }
.contact-grid { display: grid; grid-template-columns: minmax(0,1.1fr) minmax(300px,.9fr); gap: 22px; margin-top: 42px; }
.contact-card-primary { color: var(--white); background: var(--ink); border-color: var(--ink); }
.contact-card-primary h3 { color: var(--white); }
.contact-card-primary p { color: rgba(255,255,255,.7); }
.contact-email { display: inline-flex; margin-top: 22px; padding: 12px 15px; color: var(--ink); background: #c2f5e8; font-size: 1rem; font-weight: 850; }
.contact-email:hover { background: var(--white); }
.contact-list { display: grid; gap: 12px; }
.contact-list a { color: var(--blue); font-weight: 800; }
.contact-list small { display: block; margin-top: 4px; color: var(--ink-soft); font-size: .78rem; }

.hero { position: relative; min-height: 720px; display: grid; place-items: center; overflow: hidden; color: var(--white); background: var(--ink); }
.hero-visual, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-visual { object-position: 62% 50%; filter: saturate(.78) contrast(1.08) brightness(.84); }
.hero-shade { background: rgba(17,20,27,.54); }
.hero-content { position: relative; z-index: 1; width: min(860px, calc(100% - 48px)); padding: 130px 0 110px; }
.eyebrow, .section-kicker, .boundary-label { margin: 0 0 18px; color: var(--mint); font-size: .72rem; font-weight: 800; letter-spacing: .18em; }
.hero h1 { max-width: 790px; margin: 0; font-family: var(--display); font-size: clamp(3.3rem, 8vw, 7.3rem); line-height: .94; letter-spacing: -.065em; font-weight: 800; }
.hero h1 .accent { color: #ff98a7; }
.hero-lede { max-width: 650px; margin: 28px 0 0; color: rgba(255,255,255,.82); font-size: clamp(1.05rem, 2vw, 1.35rem); }
.hero-actions, .entrance-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 12px 18px; border-radius: 5px; font-size: .9rem; font-weight: 800; transition: transform .18s ease, background-color .18s ease, border-color .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--coral); }
.button-primary:hover { background: #c9374b; }
.button-quiet { color: var(--white); border: 1px solid rgba(255,255,255,.4); }
.button-quiet:hover { border-color: var(--white); background: rgba(255,255,255,.1); }
.button-secondary { color: var(--ink); border: 1px solid var(--ink); background: transparent; }
.button-secondary:hover { color: var(--white); background: var(--ink); }
.hero-note { max-width: 560px; margin: 22px 0 0; color: rgba(255,255,255,.57); font-size: .78rem; }
.hero-index { position: absolute; z-index: 1; right: 24px; bottom: 24px; display: flex; align-items: center; gap: 10px; color: rgba(255,255,255,.62); font-size: .68rem; letter-spacing: .15em; }
.hero-index-rule { width: 52px; height: 1px; background: rgba(255,255,255,.48); }
.button-install-guide { border-color: rgba(143,231,210,.64); color: #bdf4e8; }
.button-install-guide:hover { border-color: #bdf4e8; color: var(--white); background: rgba(29,191,159,.16); }

.install-guide { position: relative; overflow: hidden; color: var(--ink); background: #dfe9e5; }
.install-guide::before { content: ""; position: absolute; inset: 0 0 auto; height: 7px; background: linear-gradient(90deg, var(--mint) 0 50%, var(--coral) 50% 100%); }
.install-guide-inner { position: relative; z-index: 1; max-width: var(--max); margin: 0 auto; padding: 94px 24px 88px; }
.install-guide-heading { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(320px, .97fr); gap: 58px; align-items: end; }
.install-guide-heading .section-kicker { margin-bottom: 20px; color: #128970; }
.install-guide-heading h2 { max-width: 760px; margin: 0; font-family: var(--display); font-size: clamp(2.65rem, 5vw, 5.2rem); line-height: .9; letter-spacing: -.065em; }
.install-guide-summary > p { max-width: 550px; margin: 0 0 20px; color: #394853; font-size: 1rem; }
.install-entry { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px; align-items: center; padding: 17px 18px 17px 20px; border: 1px solid rgba(255,255,255,.18); border-left: 5px solid var(--coral); color: var(--white); background: var(--ink); box-shadow: 0 16px 28px rgba(17,20,27,.16); }
.install-entry-label { display: block; margin-bottom: 2px; color: #8fe7d2; font-size: .66rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.install-entry strong { font-size: 1.14rem; letter-spacing: -.02em; }
.install-entry-link { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 8px 11px; color: var(--ink); background: #c2f5e8; font-size: .75rem; font-weight: 800; white-space: nowrap; transition: transform .18s ease, background-color .18s ease; }
.install-entry-link:hover { background: var(--white); transform: translateY(-2px); }
.install-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 52px; }
.install-platform-card { position: relative; display: grid; grid-template-columns: minmax(0, .72fr) minmax(0, 1fr); grid-template-areas: "head visual" "steps visual"; column-gap: 28px; min-height: 444px; padding: 26px; overflow: hidden; border: 1px solid rgba(17,20,27,.18); background: var(--white); box-shadow: 0 18px 34px rgba(17,20,27,.08); }
.install-platform-card::after { content: ""; position: absolute; z-index: 0; width: 190px; height: 190px; border: 1px solid currentColor; border-radius: 50%; opacity: .11; pointer-events: none; }
.install-platform-card-ios { color: #176d9f; }
.install-platform-card-ios::after { right: -96px; bottom: -96px; }
.install-platform-card-android { color: #8a5d1a; }
.install-platform-card-android::after { left: -96px; top: -96px; }
.install-platform-head { position: relative; z-index: 1; grid-area: head; display: flex; align-items: flex-start; gap: 14px; }
.install-platform-index { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; flex: 0 0 auto; border-radius: 50%; color: var(--white); background: currentColor; font-size: .7rem; font-weight: 800; letter-spacing: .08em; }
.install-platform-head p { margin: 2px 0 4px; color: currentColor; font-size: .67rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.install-platform-head h3 { margin: 0; color: var(--ink); font-family: var(--display); font-size: clamp(1.55rem, 2.4vw, 2.2rem); line-height: .96; letter-spacing: -.045em; word-break: keep-all; }
.install-visual { position: relative; z-index: 1; grid-area: visual; align-self: stretch; min-height: 372px; overflow: hidden; border: 1px solid rgba(17,20,27,.12); background: #edf4f1; }
.install-platform-card-ios .install-visual { background: #dbeaf0; }
.install-platform-card-android .install-visual { background: #f3ebdd; }
.install-visual img { display: block; width: 100%; height: 100%; object-fit: cover; }
.install-step-list { position: relative; z-index: 1; grid-area: steps; display: grid; align-self: end; gap: 0; margin: 20px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.install-step-list li { display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 10px; align-items: center; min-height: 56px; border-bottom: 1px solid var(--line); }
.install-step-list li > span { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; border-radius: 50%; color: currentColor; background: color-mix(in srgb, currentColor 12%, white); font-size: .68rem; font-weight: 900; }
.install-step-list p { margin: 0; color: #37414c; font-size: .82rem; line-height: 1.42; }
.install-guide-note { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 12px; max-width: 790px; margin: 22px auto 0; padding: 15px 17px; border-top: 1px solid rgba(17,20,27,.25); border-bottom: 1px solid rgba(17,20,27,.25); }
.install-note-icon { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 50%; color: var(--white); background: var(--coral); font-weight: 900; }
.install-guide-note p { display: flex; flex-wrap: wrap; gap: 4px 10px; margin: 2px 0 0; color: #394853; font-size: .81rem; line-height: 1.55; }
.install-guide-note strong { color: var(--ink); }

.section-shell { max-width: var(--max); margin: 0 auto; padding: 112px 24px; }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(260px, .9fr); gap: 48px; align-items: end; }
.section-heading h2, .evidence-intro h2, .entrance-panel h2, .boundary h2 { margin: 0; font-family: var(--display); font-size: clamp(2.2rem, 4.2vw, 4.2rem); line-height: .98; letter-spacing: -.055em; }
.section-heading p, .evidence-intro p, .entrance-panel p, .boundary p { margin: 0; color: var(--ink-soft); font-size: 1rem; }
.thesis { background: var(--paper); }
.thesis-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 64px; margin-top: 64px; }
.thesis-statement { padding: 34px 0 0; border-top: 2px solid var(--coral); }
.statement-mark { display: block; color: var(--coral); font-family: Georgia, serif; font-size: 5rem; line-height: .6; }
.thesis-statement p { max-width: 580px; margin: 20px 0 24px; font-family: var(--display); font-size: clamp(2rem, 4vw, 3.5rem); line-height: .98; letter-spacing: -.05em; }
.statement-rule { display: block; width: 70px; height: 2px; background: var(--ink); }
.thesis-statement small { display: block; margin-top: 12px; color: var(--ink-soft); font-size: .75rem; }
.thesis-copy { align-self: end; padding-bottom: 4px; }
.thesis-copy p { margin: 0 0 22px; color: var(--ink-soft); font-size: 1.04rem; }
.thesis-copy p:last-child { margin-bottom: 0; color: var(--ink); font-weight: 700; }

.section-dark { max-width: none; padding-right: max(24px, calc((100% - var(--max)) / 2 + 24px)); padding-left: max(24px, calc((100% - var(--max)) / 2 + 24px)); color: var(--white); background: var(--ink); }
.section-heading-dark p { color: rgba(255,255,255,.66); }
.layer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 64px; border-top: 1px solid rgba(255,255,255,.24); }
.layer-item { display: grid; grid-template-columns: 54px 1fr; gap: 18px; min-height: 270px; padding: 26px 26px 24px 0; border-right: 1px solid rgba(255,255,255,.18); }
.layer-item + .layer-item { padding-left: 26px; }
.layer-item:last-child { border-right: 0; }
.layer-number { color: var(--mint); font-size: .74rem; font-weight: 800; letter-spacing: .12em; }
.layer-item h3 { margin: 0 0 12px; font-size: 1.2rem; letter-spacing: -.02em; }
.layer-item p { margin: 0; color: rgba(255,255,255,.67); font-size: .92rem; }
.layer-item a { display: inline-block; margin-top: 20px; color: #8fe7d2; font-size: .78rem; font-weight: 800; }
.layer-item a:hover { color: var(--white); }

.system { background: var(--paper); }
.system-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(300px, .95fr); gap: 48px; margin-top: 58px; align-items: stretch; }
.system-steps { display: grid; gap: 0; border-top: 1px solid var(--line); }
.system-step { display: grid; grid-template-columns: 58px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.system-step > span { color: var(--coral); font-size: .74rem; font-weight: 800; letter-spacing: .12em; }
.system-step h3 { margin: 0 0 5px; font-size: 1.16rem; }
.system-step p { margin: 0; color: var(--ink-soft); font-size: .92rem; }
.identity-panel { align-self: stretch; padding: 34px; color: var(--white); background: var(--ink); }
.identity-label { margin: 0 0 22px; color: var(--mint); font-size: .7rem; font-weight: 800; letter-spacing: .16em; }
.identity-panel h3 { max-width: 360px; margin: 0 0 14px; font-family: var(--display); font-size: clamp(2rem, 3.5vw, 3.2rem); line-height: .98; letter-spacing: -.04em; }
.identity-panel > p:not(.identity-label) { margin: 0; color: rgba(255,255,255,.7); font-size: .98rem; }
.identity-flow { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.identity-flow span { padding: 7px 9px; border: 1px solid rgba(255,255,255,.24); color: rgba(255,255,255,.8); font-size: .72rem; }

.evidence { background: var(--paper-2); }
.evidence-intro { display: grid; grid-template-columns: minmax(260px, .58fr) minmax(0, 1fr); grid-template-areas: "kicker title" "body title"; column-gap: 64px; row-gap: 18px; align-items: start; }
.evidence-intro .section-kicker { grid-area: kicker; margin-bottom: 0; padding-top: 14px; border-top: 2px solid var(--mint); }
.evidence-intro h2 { grid-area: title; }
.evidence-intro p { grid-area: body; }
.evidence-intro h2 { max-width: 680px; }
.evidence-intro p { max-width: 560px; }
.evidence-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 58px; }
.evidence-card { display: flex; flex-direction: column; min-width: 0; border: 1px solid var(--line); background: var(--white); transition: transform .18s ease, box-shadow .18s ease; }
.evidence-card:hover { transform: translateY(-3px); box-shadow: 0 14px 28px rgba(17,20,27,.1); }
.evidence-card-wide { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(280px, 380px) minmax(0, 1fr); justify-content: center; }
.evidence-card-wide .evidence-media { display: grid; place-items: center; aspect-ratio: 3 / 4; min-height: 0; padding: 20px; }
.evidence-media { position: relative; display: grid; place-items: center; min-height: 230px; overflow: hidden; background: #d9dce4; }
.evidence-media img { display: block; width: auto; height: auto; max-width: 100%; max-height: 100%; min-height: 0; object-fit: contain; object-position: center; }
.evidence-card-wide .evidence-media img { width: min(264px, 100%); height: auto; max-height: 100%; min-height: 0; object-fit: contain; object-position: center; }
.evidence-card:not(.evidence-card-wide) .evidence-media { min-height: 506px; padding: 22px; }
.evidence-card:not(.evidence-card-wide) .evidence-media img { max-width: min(78%, 320px); max-height: 462px; min-height: 0; }
.media-tag { position: absolute; left: 16px; bottom: 14px; padding: 5px 8px; color: var(--white); background: rgba(17,20,27,.82); font-size: .65rem; font-weight: 800; letter-spacing: .12em; }
.evidence-media-paper { display: grid; place-items: center; min-height: 230px; color: var(--blue); font-family: Georgia, serif; font-size: 5.2rem; background: #dfe5f7; }
.evidence-media-paper .media-tag { font-family: var(--sans); }
.evidence-card-copy { display: flex; flex-direction: column; align-items: flex-start; padding: 24px; }
.evidence-card-wide .evidence-card-copy { justify-content: center; padding: 34px 38px; }
.evidence-card-copy h3 { margin: 0 0 8px; font-size: 1.32rem; letter-spacing: -.03em; }
.evidence-card-copy p { margin: 0; color: var(--ink-soft); font-size: .9rem; }
.evidence-card-points { display: grid; gap: 10px; width: 100%; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.evidence-card-points span { position: relative; padding-left: 18px; color: #343b49; font-size: .86rem; line-height: 1.55; }
.evidence-card-points span::before { content: ""; position: absolute; left: 0; top: .67em; width: 6px; height: 6px; border-radius: 50%; background: var(--mint); }
.text-link { display: inline-block; margin-top: 22px; color: var(--blue); font-size: .8rem; font-weight: 800; }
.metric-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; margin-top: 28px; border: 1px solid var(--line); background: var(--line); }
.metric { display: flex; align-items: baseline; gap: 10px; min-height: 72px; padding: 16px 18px; background: var(--white); }
.metric strong { color: var(--coral); font-family: var(--display); font-size: 1.9rem; line-height: 1; }
.metric span { color: var(--ink-soft); font-size: .75rem; font-weight: 700; }
.entrances { background: var(--paper); }
.entrance-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, .65fr); gap: 48px; align-items: end; padding: 42px; border: 1px solid var(--ink); background: var(--white); }
.entrance-panel h2 { margin-bottom: 18px; }
.entrance-panel p { max-width: 650px; }
.entrance-actions { justify-content: flex-end; margin-top: 0; }
.boundary { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 44px; padding-top: 70px; padding-bottom: 70px; border-top: 1px solid var(--line); background: var(--paper); }
.boundary-label { color: var(--coral); }
.boundary h2 { font-size: clamp(1.9rem, 3.3vw, 3.2rem); }
.boundary p { max-width: 740px; margin-top: 16px; }

.site-footer { display: grid; grid-template-columns: 1fr auto auto; gap: 32px; align-items: end; padding: 36px max(24px, calc((100% - var(--max)) / 2 + 24px)); color: rgba(255,255,255,.72); background: var(--ink); }
.footer-brand .wordmark { color: var(--white); }
.footer-brand p { margin: 8px 0 0; font-size: .76rem; }
.footer-links { display: flex; gap: 18px; font-size: .76rem; }
.footer-links a:hover { color: var(--white); }
.footer-meta { margin: 0; color: rgba(255,255,255,.45); font-size: .72rem; }

@media (max-width: 840px) {
  .site-header { display: grid; grid-template-columns: 1fr auto; gap: 10px 14px; padding: 16px 18px; }
  .primary-nav { display: flex; grid-column: 1 / -1; grid-row: 2; width: 100%; gap: 16px; margin: 0; padding-bottom: 2px; overflow-x: auto; font-size: .73rem; }
  .primary-nav a { flex: 0 0 auto; white-space: nowrap; }
  .header-actions { margin-left: auto; }
  .hero { min-height: 680px; }
  .hero-content { width: min(760px, calc(100% - 36px)); padding-top: 120px; }
  .install-guide-inner { padding: 76px 18px; }
  .install-guide-heading { grid-template-columns: 1fr; gap: 28px; }
  .install-card-grid { grid-template-columns: 1fr; }
  .install-platform-card { grid-template-columns: minmax(0, .76fr) minmax(260px, 1fr); min-height: 400px; }
  .section-shell { padding: 82px 18px; }
  .section-heading, .thesis-grid, .evidence-intro { grid-template-columns: 1fr; gap: 24px; }
  .evidence-intro { grid-template-areas: "kicker" "title" "body"; }
  .evidence-intro .section-kicker { padding-top: 0; border-top: 0; }
  .layer-grid { grid-template-columns: 1fr; }
  .layer-item, .layer-item + .layer-item { grid-template-columns: 48px 1fr; min-height: 0; padding: 24px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.18); }
  .layer-item:last-child { border-bottom: 0; }
  .system-grid { grid-template-columns: 1fr; gap: 24px; }
  .evidence-grid { grid-template-columns: 1fr; }
  .evidence-card-wide { grid-column: auto; display: flex; }
  .evidence-card-wide .evidence-media { width: 100%; aspect-ratio: 9 / 13; }
  .evidence-card-wide .evidence-card-copy { padding: 24px; }
  .evidence-card:not(.evidence-card-wide) .evidence-media { min-height: 0; aspect-ratio: 9 / 13; }
  .evidence-card:not(.evidence-card-wide) .evidence-media img { max-width: min(78%, 300px); max-height: 100%; }
  .metric-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .entrance-panel, .boundary { grid-template-columns: 1fr; gap: 26px; padding: 28px 22px; }
  .entrance-actions { justify-content: flex-start; }
  .site-footer { grid-template-columns: 1fr; gap: 16px; padding: 30px 18px; }
  .footer-meta { order: 3; }
}

@media (max-width: 520px) {
  .wordmark { font-size: 1rem; }
  .locale-trigger { min-width: 68px; padding-inline: 8px; }
  .locale-menu { right: -6px; width: min(242px, calc(100vw - 32px)); }
  .header-cta { padding: 7px 9px; font-size: .68rem; }
  .hero h1 { font-size: clamp(3rem, 16vw, 5rem); }
  .hero-lede { font-size: 1rem; }
  .hero-actions .button { flex: 1 1 100%; }
  .install-guide-inner { padding-top: 66px; padding-bottom: 64px; }
  .install-guide-heading h2 { font-size: clamp(2.65rem, 14vw, 4.2rem); }
  .install-entry { grid-template-columns: 1fr; gap: 14px; }
  .install-entry-link { justify-self: start; }
  .install-card-grid { margin-top: 34px; }
  .install-platform-card { grid-template-columns: 1fr; grid-template-areas: "head" "visual" "steps"; gap: 18px; min-height: 0; padding: 20px; }
  .install-visual { min-height: 332px; }
  .install-step-list { margin-top: 0; }
  .install-guide-note { grid-template-columns: 30px minmax(0, 1fr); margin-top: 18px; padding-inline: 2px; }
  .evidence-card-copy { padding: 20px; }
  .evidence-card-wide .evidence-media { aspect-ratio: 9 / 13; }
  .identity-panel { padding: 26px 22px; }
  .metric { min-height: 64px; padding: 13px 12px; }
  .metric strong { font-size: 1.5rem; }
  .footer-links { flex-wrap: wrap; }
}

@media (max-width: 840px) {
  .about-grid, .about-principles, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 520px) {
  .about-hero-inner, .contact-hero-inner, .about-section, .contact-section { width: min(100% - 32px, var(--max)); }
  .about-section.alt, .contact-section.alt { padding-inline: 16px; }
  .about-hero-inner, .contact-hero-inner { padding: 86px 0 78px; }
  .about-hero h1, .contact-hero h1 { font-size: clamp(3rem, 15vw, 5rem); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}