/* inogen.world. Laws and tokens: DESIGN.md. Anything not defined here is not part of the system. */
:root {
  /* Health palette: one teal family from the Inogen logo, one green accent. */
  --white: #FFFFFF;
  --mist: #EEF6F3;
  --mist-2: #E1EFEA;
  --rule: #D2E3DD;
  --slate: #1E3236;
  --slate-2: #3B5155;
  --muted: #546A6D;
  --blue: #1D6F75;
  --blue-deep: #155A5F;
  --night: #0C3A40;
  --deep-2: #0F4A50;
  --teal: #1D6F75;
  --green: #3E9C74;
  --green-ink: #2C7A58;
  --glow: #8FDCC8;
  --on-dark: #D7ECE6;
  --on-dark-2: #A9CDC4;
  --display: "Plus Jakarta Sans", "Segoe UI", Roboto, sans-serif;
  --text: "Source Sans 3", "Segoe UI", Roboto, sans-serif;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section: clamp(4.5rem, 10vw, 8.5rem);
  --r-media: 1.25rem;
  --r-card: 1rem;
  --r-thumb: 0.625rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --head-h: 4.5rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 8rem; }
body { margin: 0; background: var(--white); color: var(--slate); font: 400 1.0625rem/1.65 var(--text); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 0.2em; transition: color 200ms var(--ease); }
a:hover { color: var(--blue-deep); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, .h3 { font-family: var(--display); color: var(--slate); line-height: 1.12; letter-spacing: -0.02em; margin: 0; }
h1 { font-size: clamp(2.2rem, 1.2rem + 3.6vw, 4.1rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 1.2rem + 1.8vw, 2.7rem); font-weight: 700; }
h3, .h3 { font-size: 1.15rem; font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; }
code { font: 600 0.92em/1 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--blue-deep); }
.small { font-size: 0.9rem; color: var(--muted); }
.mt { margin-top: 2rem; }
.skip { position: absolute; left: -999px; top: 0; background: var(--slate); color: var(--white); padding: 0.6rem 1rem; z-index: 30; }
.skip:focus { left: 1rem; top: 1rem; }
.wrap { max-width: 80rem; margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: 50rem; }

.caps { font: 700 0.725rem/1.4 var(--display); letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); margin: 0 0 1rem; }
.caps .n { color: var(--green-ink); margin-right: 0.6rem; font-variant-numeric: tabular-nums; }
.caps.light { color: var(--glow); }
.sub { color: var(--slate-2); font-size: 1.125rem; max-width: 42rem; margin: 0.9rem 0 0; }

/* Header: navigation always visible, no menu button */
.site-head { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, 0.92); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid transparent; transition: border-color 300ms var(--ease), background 300ms var(--ease); }
.site-head.scrolled { border-bottom-color: var(--rule); background: rgba(255, 255, 255, 0.97); }
.head-row { display: flex; align-items: center; gap: 1.5rem; min-height: var(--head-h); }
.brand { display: inline-flex; align-items: center; gap: 0.55rem; text-decoration: none; color: var(--slate); }
.brand .mark { width: auto; height: 2.75rem; }
.wm { display: grid; line-height: 1; }
.wm-name { font: 800 1.45rem/1 var(--display); letter-spacing: 0.06em; color: var(--slate); }
.wm-tag { font: 700 0.62rem/1 var(--display); letter-spacing: 0.2em; text-transform: uppercase; color: var(--teal); margin-top: 0.3rem; }
.mainnav { margin-left: auto; }
.nav { list-style: none; display: flex; gap: 0.35rem; margin: 0; padding: 0; font: 600 0.92rem/1 var(--display); }
.nav a { color: var(--slate); text-decoration: none; padding: 0.65rem 0.8rem; border-radius: 999px; display: inline-block; white-space: nowrap; transition: background 200ms var(--ease), color 200ms var(--ease); }
.nav a:hover { background: var(--mist); color: var(--blue); }
.nav a[aria-current="page"] { background: var(--mist); color: var(--blue); }
.head-actions { display: flex; align-items: center; gap: 0.6rem; }
.lang-switch { font: 600 0.85rem/1 var(--display); border: 1px solid var(--rule); border-radius: 999px; padding: 0.65rem 0.95rem; text-decoration: none; color: var(--blue); white-space: nowrap; }
.lang-switch:hover { border-color: var(--blue); }

/* Controls */
.btn { display: inline-flex; align-items: center; gap: 0.4rem; font: 700 0.95rem/1 var(--display); background: var(--blue); color: var(--white); padding: 1rem 1.55rem; border-radius: 999px; text-decoration: none; border: 1px solid var(--blue); cursor: pointer; transition: background 250ms var(--ease), transform 250ms var(--ease), border-color 250ms var(--ease); }
.btn:hover { background: var(--blue-deep); border-color: var(--blue-deep); color: var(--white); transform: translateY(-2px); }
.btn.small-btn { padding: 0.75rem 1.1rem; font-size: 0.88rem; }
.btn.ghost { background: transparent; color: var(--blue); border-color: var(--rule); }
.btn.ghost:hover { border-color: var(--blue); background: transparent; color: var(--blue); }
.btn.light { background: var(--white); color: var(--blue-deep); border-color: var(--white); }
.btn.light:hover { background: var(--mist); color: var(--blue-deep); }
.btn.ghost-light { background: transparent; color: var(--white); border-color: rgba(255, 255, 255, 0.35); }
.btn.ghost-light:hover { border-color: var(--white); background: rgba(255, 255, 255, 0.08); color: var(--white); }
.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 2rem 0; }
.pill { display: inline-block; font: 700 0.7rem/1 var(--display); letter-spacing: 0.14em; color: var(--blue); background: var(--white); border: 1px solid var(--rule); border-radius: 999px; padding: 0.45rem 0.7rem; vertical-align: middle; }
.link { font: 700 0.92rem/1 var(--display); text-decoration: none; color: var(--blue); }
.link::after { content: " →"; display: inline-block; transition: transform 250ms var(--ease); }
a.link:hover::after, .card:hover .link::after { transform: translateX(4px); }

.g12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: clamp(1.5rem, 3.5vw, 3.5rem); row-gap: 2rem; align-items: start; }
.c4 { grid-column: span 4; } .c5 { grid-column: span 5; } .c6 { grid-column: span 6; } .c7 { grid-column: span 7; } .c8 { grid-column: span 8; }

/* Hero: night gradient, live PCR curves, floating kits */
.hero { position: relative; overflow: hidden; color: var(--white); background: radial-gradient(120% 90% at 85% 10%, #1A6B70 0%, var(--deep-2) 45%, var(--night) 100%); padding: clamp(4rem, 9vw, 7.5rem) 0 clamp(5rem, 9vw, 8rem); }
.hero-media { position: relative; margin: 0; border-radius: var(--r-media); overflow: hidden; aspect-ratio: 1 / 1; box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.6); }
.hero-media video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-media canvas.ecg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-grid { position: relative; z-index: 1; align-items: center; }
.hero h1 { color: var(--white); margin: 0 0 1.5rem; max-width: 19ch; font-size: clamp(2.1rem, 1.2rem + 2.7vw, 3.5rem); line-height: 1.08; }
.hero .lead { color: var(--on-dark); font-size: 1.25rem; line-height: 1.55; max-width: 34rem; }
.stats { display: grid; grid-template-columns: repeat(3, auto); justify-content: start; margin: 0; border-top: 1px solid rgba(255, 255, 255, 0.18); }
.stats div { padding: 1.1rem 1.6rem 0 0; }
.stats div + div { border-left: 1px solid rgba(255, 255, 255, 0.18); padding-left: 1.6rem; }
.stats dt { font: 700 0.7rem/1.4 var(--display); letter-spacing: 0.18em; text-transform: uppercase; color: var(--on-dark-2); }
.stats dd { margin: 0.35rem 0 0; font: 700 1.1rem/1.3 var(--display); color: var(--white); }
@keyframes float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -14px; } }
.scroll-cue { position: absolute; left: 50%; bottom: 1.6rem; width: 26px; height: 42px; margin-left: -13px; border: 1.5px solid rgba(255, 255, 255, 0.45); border-radius: 14px; z-index: 2; }
.scroll-cue span { position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; border-radius: 2px; background: var(--white); animation: cue 1.8s var(--ease) infinite; }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 30% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }

/* PCR band */
.pcr-band { background: linear-gradient(160deg, var(--night), var(--deep-2)); color: var(--white); padding: var(--section) 0; }
.pcr-band h2 { color: var(--white); }
.pcr-band .sub { color: var(--on-dark); }
.pcr-band .g12 { align-items: center; }
.pcr-band canvas.pcr { display: block; width: 100%; aspect-ratio: 16 / 9; border-radius: var(--r-media); background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08); }

/* Video media frame */
.media-frame { margin: 0; border-radius: var(--r-media); overflow: hidden; background: var(--mist); position: sticky; top: calc(var(--head-h) + 2rem); }
.media-frame video { display: block; width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }

/* Light sheen across real product photos (honest motion: the photo itself never changes) */
.card-img::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(105deg, transparent 35%, rgba(255,255,255,0.6) 48%, transparent 61%); background-size: 250% 100%; background-position: 160% 0; mix-blend-mode: soft-light; opacity: 0; }
.card:hover .card-img::after { opacity: 1; animation: sheen 1.4s var(--ease) 1; }
@keyframes sheen { 0% { background-position: 160% 0; } 55%, 100% { background-position: -60% 0; } }

/* Kinetic headline: words rise out of a mask */
.kinetic .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: 0.08em; }
.kinetic .w > span { display: inline-block; }
.js .kinetic .w > span { transform: translateY(105%); transition: transform 1000ms var(--ease); transition-delay: calc(var(--i) * 55ms + 120ms); }
.js .kinetic.in .w > span { transform: none; }

/* Page head for inner pages */
.page-head { position: relative; overflow: hidden; color: var(--white); background: radial-gradient(110% 120% at 90% 0%, #1A6B70 0%, var(--deep-2) 50%, var(--night) 100%); padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(3rem, 6vw, 4.5rem); }
.page-head canvas.molecules { position: absolute; inset: 0; width: 100%; height: 100%; }
.page-head .wrap { position: relative; z-index: 1; }
.page-head h1 { color: var(--white); max-width: 20ch; margin-bottom: 1rem; }
.page-head .lead { color: var(--on-dark); font-size: 1.2rem; max-width: 44rem; margin: 0; }
.page-head .crumbs a, .page-head .crumbs li { color: var(--on-dark-2); }
.crumbs ol { list-style: none; margin: 0 0 1.5rem; padding: 0; display: flex; flex-wrap: wrap; gap: 0.3rem; font: 600 0.82rem/1.4 var(--display); color: var(--muted); }
.crumbs li + li::before { content: "/"; margin-right: 0.3rem; opacity: 0.6; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

/* Sections */
.block { padding: var(--section) 0; }
.block.tight { padding-top: clamp(3rem, 6vw, 4.5rem); }
.soft { background: var(--mist); }
.head { margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.row-head { display: flex; justify-content: space-between; align-items: end; gap: 2rem; flex-wrap: wrap; }
.row-head > p { margin: 0 0 0.4rem; }
.prose p { max-width: 42rem; }
.ticks { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.ticks li { padding: 0.95rem 0 0.95rem 2rem; position: relative; border-bottom: 1px solid var(--rule); }
.ticks li::before { content: ""; position: absolute; left: 0.25rem; top: 1.45rem; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px rgba(62, 156, 116, 0.15); }
.mission { margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--rule); }
.mission h3 { margin-bottom: 0.6rem; }

/* Staggered lists */
.js .stagger > * { opacity: 0; transform: translateY(1rem); transition: opacity 700ms var(--ease), transform 700ms var(--ease); }
.js .stagger.in > * { opacity: 1; transform: none; }
.js .stagger.in > *:nth-child(2) { transition-delay: 60ms; } .js .stagger.in > *:nth-child(3) { transition-delay: 120ms; }
.js .stagger.in > *:nth-child(4) { transition-delay: 180ms; } .js .stagger.in > *:nth-child(5) { transition-delay: 240ms; }
.js .stagger.in > *:nth-child(n+6) { transition-delay: 300ms; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1rem, 2vw, 1.75rem); }
.cards.two-up { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { position: relative; background: var(--white); border-radius: var(--r-card); padding: 1.25rem 1.25rem 1.1rem; display: flex; flex-direction: column; transition: transform 500ms var(--ease), box-shadow 500ms var(--ease); }
.block:not(.soft) .card { background: var(--mist); }
.card:hover { box-shadow: 0 24px 48px -28px rgba(12, 58, 64, 0.30); }
.card-img { overflow: hidden; border-radius: var(--r-thumb); display: block; margin-bottom: 1.1rem; background: var(--white); }
.card-img img { aspect-ratio: 1 / 1; object-fit: cover; transition: transform 900ms var(--ease); }
.card:hover .card-img img { transform: scale(1.05); }
.card-img.wide img { aspect-ratio: 16 / 9; }
.card-img.contain img { object-fit: contain; background: var(--white); }
.card .caps { margin-bottom: 0.5rem; }
.card h3 { margin-bottom: 0.5rem; }
.card h3 a { color: var(--slate); text-decoration: none; }
.card h3 a:hover { color: var(--blue); }
.stretch::after { content: ""; position: absolute; inset: 0; border-radius: var(--r-card); }
.card p { color: var(--slate-2); }
.card-foot { margin-top: auto; display: flex; justify-content: space-between; align-items: center; padding-top: 0.8rem; border-top: 1px solid var(--rule); margin-bottom: 0; }

/* Marquee of targets */
.marquee-band { background: var(--night); color: var(--white); padding: 2.2rem 0 2.4rem; overflow: hidden; }
.marquee-label { text-align: center; color: var(--glow); margin-bottom: 1.2rem; }
.marquee { display: flex; width: max-content; animation: marquee 48s linear infinite; }
.marquee ul { list-style: none; display: flex; gap: 3rem; margin: 0; padding: 0 1.5rem; }
.marquee li { font: italic 600 clamp(1.3rem, 1rem + 1.2vw, 2rem)/1.2 var(--display); white-space: nowrap; color: var(--on-dark); }
.marquee li::after { content: "·"; margin-left: 3rem; color: var(--green); font-style: normal; }
.marquee-band:hover .marquee { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* Founder with parallax frame */
.parallax-frame { margin: 0; overflow: hidden; border-radius: var(--r-media); }
.parallax { display: block; will-change: transform; transform: scale(1.12); }
.founder .parallax img { aspect-ratio: 4 / 5; object-fit: cover; object-position: 50% 35%; width: 100%; }
.parallax-frame .parallax img { width: 100%; object-fit: cover; }
.role { font: 600 1rem/1.4 var(--display); color: var(--muted); margin: 0.6rem 0 1.5rem; }
.lead-s { font-size: 1.15rem; color: var(--slate); font-weight: 600; line-height: 1.5; }
.founder .prose p:not(.lead-s):not(.caps):not(.role) { color: var(--slate-2); }

/* Papers */
.papers { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); counter-reset: paper; }
.papers li { display: grid; grid-template-columns: 3.5rem minmax(0, 1fr) auto; gap: 1.5rem; padding: 1.6rem 0; border-bottom: 1px solid var(--rule); align-items: baseline; counter-increment: paper; transition: background 300ms var(--ease); }
.papers li:hover { background: rgba(255, 255, 255, 0.5); }
.papers li::before { content: counter(paper, decimal-leading-zero); font: 700 0.85rem/1 var(--display); color: var(--green-ink); }
.papers h3 { font-size: 1.08rem; margin-bottom: 0.35rem; }
.meta { color: var(--muted); font-size: 0.95rem; margin: 0; }

/* Why */
.why { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1rem, 2vw, 1.75rem); }
.why li { background: var(--mist); border-radius: var(--r-card); padding: 1rem 1rem 1.4rem; }
.soft .why li { background: var(--white); }
.why-img { position: relative; overflow: hidden; border-radius: var(--r-thumb); margin-bottom: 1.2rem; aspect-ratio: 16 / 9; }
.why-img video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity 400ms var(--ease); }
.why-img.playing video { opacity: 1; }
.why-img img { aspect-ratio: 16 / 9; object-fit: cover; transition: transform 1200ms var(--ease); }
.why li:hover .why-img img { transform: scale(1.06); }
.why h3 { margin-bottom: 0.5rem; }
.why p { color: var(--slate-2); margin: 0; }

/* FAQ */
.faq { border-top: 1px solid var(--rule); }
details { border-bottom: 1px solid var(--rule); }
summary { font: 600 1.05rem/1.45 var(--display); cursor: pointer; color: var(--slate); list-style: none; padding: 1.3rem 2.5rem 1.3rem 0; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: ""; position: absolute; right: 0.4rem; top: 1.65rem; width: 0.55rem; height: 0.55rem; border-right: 1.5px solid var(--blue); border-bottom: 1.5px solid var(--blue); transform: rotate(45deg); transition: transform 300ms var(--ease); }
details[open] summary::after { transform: rotate(-135deg); top: 1.9rem; }
details p { margin: 0 0 1.4rem; color: var(--slate-2); max-width: 44rem; }

/* Contact */
.contact { margin: 2rem 0 0; border-top: 1px solid var(--rule); }
.contact div { padding: 1.1rem 0; border-bottom: 1px solid var(--rule); }
.contact dt { font: 700 0.725rem/1.4 var(--display); letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); }
.contact dd { margin: 0.35rem 0 0; }
.form { background: var(--white); border-radius: var(--r-card); padding: clamp(1.25rem, 3vw, 2rem); display: grid; gap: 1rem; }
.block:not(.soft) .form { background: var(--mist); }
.tel-field { border: 0; margin: 0; padding: 0; min-width: 0; }
.tel-field legend { font: 600 0.88rem/1.3 var(--display); color: var(--slate); padding: 0; margin-bottom: 0.35rem; }
.tel-row { display: grid; grid-template-columns: minmax(0, 11rem) minmax(0, 1fr); gap: 0.5rem; }
.form label { display: grid; gap: 0.35rem; font: 600 0.88rem/1.3 var(--display); color: var(--slate); }
.form input, .form select, .form textarea, .tel-row select, .tel-row input { font: 400 1rem/1.4 var(--text); padding: 0.8rem 0.9rem; border: 1px solid #93AFA8; border-radius: var(--r-thumb); background: var(--white); color: var(--slate); width: 100%; transition: border-color 200ms var(--ease); }
.form input:focus, .form select:focus, .form textarea:focus { border-color: var(--blue); }
.form .btn { justify-self: start; }
.form .form-consent { grid-template-columns: 1.15rem 1fr; align-items: start; gap: 0.65rem; font-family: var(--text); font-weight: 400; line-height: 1.5; }
.form .form-consent input { width: 1.15rem; height: 1.15rem; margin-top: 0.15rem; padding: 0; accent-color: var(--teal); }
.form-thanks { min-height: 58vh; display: grid; align-items: center; }

/* Products index */
.prows { display: grid; gap: clamp(3rem, 7vw, 6rem); }
.prow { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: center; }
.prow.flip { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.prow.flip .prow-img { order: 2; }
.prow-img { display: block; overflow: hidden; border-radius: var(--r-media); background: var(--mist); }
.prow-img img { aspect-ratio: 1 / 1; object-fit: cover; width: 100%; }
.prow h2 a { color: var(--slate); text-decoration: none; }
.prow h2 a:hover { color: var(--blue); }

/* Key facts */
.kfacts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 1.6rem 0 0; border-top: 1px solid var(--rule); }
.kfacts div { padding: 1rem 1rem 1rem 0; border-bottom: 1px solid var(--rule); }
.kfacts dd { margin: 0; font: 800 1.35rem/1.15 var(--display); color: var(--blue); letter-spacing: -0.01em; }
.kfacts dt { font: 600 0.85rem/1.35 var(--text); color: var(--muted); margin-top: 0.3rem; }
.kfacts { display: grid; }
.kfacts div { display: flex; flex-direction: column-reverse; }

/* Product page */
.product-hero { padding: clamp(2rem, 4vw, 3rem) 0 clamp(3rem, 6vw, 4.5rem); }
.stage { margin: 0; border-radius: var(--r-media); background: var(--white); overflow: hidden; position: relative; }
.stage-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; background: var(--white); z-index: 1; transition: opacity 400ms var(--ease); }
.stage-video.off { opacity: 0; pointer-events: none; }
.stage-img { aspect-ratio: 1 / 1; object-fit: contain; width: 100%; transition: opacity 220ms var(--ease), transform 900ms var(--ease); }
.stage-img.swap { opacity: 0; transform: scale(0.985); }
.thumbs { list-style: none; margin: 0.75rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 0.5rem; }
.thumb { padding: 0; border: 2px solid transparent; border-radius: var(--r-thumb); background: var(--mist); cursor: pointer; overflow: hidden; display: block; width: 100%; transition: border-color 200ms var(--ease); }
.thumb img { aspect-ratio: 1 / 1; object-fit: cover; }
.thumb.on, .thumb:hover { border-color: var(--blue); }
.product-summary h1 { font-size: clamp(1.9rem, 1.2rem + 2.2vw, 3rem); margin: 0 0 1rem; }
.status { font-size: 0.92rem; color: var(--muted); margin-bottom: 1.2rem; }
.status .pill { margin-right: 0.4rem; }
.subnav { position: sticky; top: var(--head-h); z-index: 15; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(8px); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.subnav ul { list-style: none; display: flex; gap: 0.3rem; margin: 0; padding: 0.55rem 0; overflow-x: auto; scrollbar-width: none; }
.subnav ul::-webkit-scrollbar { display: none; }
.subnav a { display: inline-block; white-space: nowrap; padding: 0.55rem 0.95rem; border-radius: 999px; font: 600 0.88rem/1 var(--display); color: var(--slate); text-decoration: none; transition: background 200ms var(--ease), color 200ms var(--ease); }
.subnav a:hover, .subnav a.on { background: var(--mist); color: var(--blue); }
.feats { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.feats li { background: var(--mist); border-radius: var(--r-card); padding: 1.4rem; }
.feats h3 { margin-bottom: 0.5rem; }
.feats p { margin: 0; color: var(--slate-2); }
.guide-link { margin-top: 2rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); }
.guide-link p:last-child a { font: 700 1.02rem/1.4 var(--display); }
.spec { margin: 0; border-top: 1px solid var(--rule); }
.spec div { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: 1.5rem; padding: 1rem 0; border-bottom: 1px solid var(--rule); }
.spec dt { font: 700 0.92rem/1.45 var(--display); color: var(--slate); }
.spec dd { margin: 0; color: var(--slate-2); }
.flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; counter-reset: step; position: relative; }
.flow li { background: var(--white); border-radius: var(--r-card); padding: 1.5rem; position: relative; }
.step { display: inline-flex; align-items: center; justify-content: center; width: 2.6rem; height: 2.6rem; border-radius: 50%; background: var(--blue); color: var(--white); font: 800 0.95rem/1 var(--display); margin-bottom: 1rem; }
.flow h3 { margin-bottom: 0.4rem; }
.flow p { margin: 0; color: var(--slate-2); }
.table-wrap { overflow-x: auto; border-radius: var(--r-card); border: 1px solid var(--rule); }
.order { width: 100%; border-collapse: collapse; font-size: 0.98rem; }
.order th { text-align: left; font: 700 0.75rem/1.4 var(--display); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); background: var(--mist); padding: 0.9rem 1rem; }
.order td { padding: 1rem; border-top: 1px solid var(--rule); vertical-align: top; }
.order tbody tr { transition: background 200ms var(--ease); }
.order tbody tr:hover { background: rgba(234, 244, 241, 0.6); }
.docs { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--rule); }
.docs li { border-bottom: 1px solid var(--rule); }
.docs a { display: block; padding: 1.1rem 0; font: 700 1.02rem/1.4 var(--display); text-decoration: none; }
.docs a::after { content: " ↓"; color: var(--green-ink); }

/* Guide */
.guide h1 { font-size: clamp(1.9rem, 1.2rem + 2.2vw, 3rem); margin: 0 0 1.2rem; }
.guide .lead { font-size: 1.2rem; color: var(--slate-2); }
.aside { position: sticky; top: calc(var(--head-h) + 1.5rem); display: grid; gap: 1.5rem; }
.toc ol { margin: 0; padding: 1.2rem 1.2rem 1.2rem 2.4rem; background: var(--mist); border-radius: var(--r-card); font: 600 0.92rem/1.5 var(--display); }
.toc li { margin: 0.35rem 0; }
.toc a { text-decoration: none; }
.aside-card { background: var(--mist); border-radius: var(--r-card); padding: 1.2rem; }
.aside-card img { border-radius: var(--r-thumb); background: var(--white); margin-bottom: 1rem; }
.sources { padding-left: 1.3rem; font-size: 0.95rem; color: var(--slate-2); }
.sources li { margin-bottom: 0.5rem; }

/* Post */
.post h1 { font-size: clamp(1.9rem, 1.3rem + 2.2vw, 2.9rem); margin-bottom: 1rem; }
.post-img { margin: 2rem 0 2.5rem; border-radius: var(--r-media); overflow: hidden; }
.post-img img { aspect-ratio: 16 / 9; object-fit: cover; object-position: 50% 30%; }
.post-body h2, .post-body h3 { margin: 2.4rem 0 0.7rem; color: var(--blue); }
.post-body .lead { font-size: 1.18rem; }
.post-body ul, .post-body ol { padding-left: 1.3rem; }
.post-body li { margin-bottom: 0.45rem; }
.post-body a { word-break: break-word; }
.post-body #toc_container, .post-body .toc-wrapper { background: var(--mist); border-radius: var(--r-card); padding: 1rem 1.25rem; margin-bottom: 2rem; }
.profile-related { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.profile-related h2 { margin: 0 0 0.55rem; font-size: clamp(1.35rem, 2vw, 1.75rem); color: var(--blue); }
.profile-related p { margin: 0.45rem 0; }
.profile-related a { font-weight: 600; }

/* CTA band */
.band { position: relative; overflow: hidden; background: linear-gradient(120deg, var(--deep-2), var(--night)); color: var(--white); padding: clamp(3.5rem, 7vw, 5.5rem) 0; }
.band canvas.molecules { position: absolute; inset: 0; width: 100%; height: 100%; }
.band-row { position: relative; z-index: 1; display: flex; justify-content: space-between; align-items: center; gap: 2rem; flex-wrap: wrap; }
.band h2 { color: var(--white); }
.band p { color: var(--on-dark); margin: 0.6rem 0 0; max-width: 40rem; }
.band .band-cta { margin: 0; }

/* Offices by country */
.offices { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; margin: 2rem 0 0; }
.offices h3 { font-size: 1rem; margin: 0 0 0.6rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--rule); }
.offices dl { margin: 0; }
.offices dl div { padding: 0.45rem 0; }
.offices dt { font: 700 0.7rem/1.4 var(--display); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.offices dd { margin: 0.2rem 0 0; min-height: 1.2em; }
.office-email { margin-top: 1.5rem; }
.office-email span { font: 700 0.7rem/1.4 var(--display); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin-right: 0.5rem; }
.foot-offices { grid-template-columns: minmax(0, 1fr); gap: 1rem; margin: 0 0 1rem; }
.foot-offices h3 { color: var(--glow); font-size: 0.8rem; border-bottom-color: rgba(255,255,255,0.14); }
.foot-offices dt { color: var(--on-dark-2); }
.notice { border-top: 1px solid rgba(255, 255, 255, 0.14); margin-top: 1.5rem; padding-top: 1rem; max-width: 80rem; font-size: 0.8rem; }
.copy { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.legal-links { display: flex; gap: 1.4rem; }
.legal .post-body h2 { font-size: 1.25rem; }

/* Footer */
.site-foot { background: var(--night); color: var(--on-dark); padding: clamp(2.25rem, 4vw, 3rem) 0 1.25rem; }
.site-foot p, .site-foot .small { color: var(--on-dark-2); }
.site-foot a { color: var(--white); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; }
.foot-brand { margin: 0 0 0.9rem !important; }
.foot-brand .mark { height: 2.4rem; }
.foot-brand .wm-name { color: var(--white); font-size: 1.3rem; }
.foot-brand .wm-tag { color: var(--glow); }
.foot-office { margin: 0 0 0.6rem !important; line-height: 1.5; }
.foot-office strong { display: block; color: var(--glow); font: 700 0.7rem/1.6 var(--display); letter-spacing: 0.16em; text-transform: uppercase; }
.foot-grid { display: grid; grid-template-columns: 4fr 3fr 2fr 3fr; gap: clamp(1.5rem, 4vw, 3rem); }
.foot-h { font: 700 0.725rem/1.4 var(--display); letter-spacing: 0.18em; text-transform: uppercase; color: var(--glow) !important; margin-bottom: 0.9rem; }
.foot-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; font-size: 0.92rem; }
.foot-grid p { margin: 0 0 0.5rem; }
.copy { margin-top: 0.9rem; padding-top: 0.9rem; border-top: 1px solid rgba(255, 255, 255, 0.14); }

/* Section reveal */
.js .reveal { opacity: 0; transform: translateY(1.5rem); transition: opacity 900ms var(--ease), transform 900ms var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal, .js .stagger > *, .js .kinetic .w > span { opacity: 1 !important; transform: none !important; transition: none !important; }
  .why-img video { display: none; }
  .marquee, .scroll-cue span, .stage::after, .prow-img::after, .card-img::after { animation: none !important; }
  *, *::before, *::after { transition-duration: 0ms !important; }
}

/* Responsive: the navigation becomes a swipeable row under the logo, never a menu button */
@media (max-width: 68rem) {
  .head-row { flex-wrap: wrap; gap: 0.5rem 1rem; padding-top: 0.6rem; }
  .head-actions { margin-left: auto; }
  .mainnav { order: 3; flex-basis: 100%; margin: 0 calc(var(--gutter) * -1); overflow-x: auto; scrollbar-width: none; -webkit-mask-image: linear-gradient(90deg, #000 85%, transparent); mask-image: linear-gradient(90deg, #000 85%, transparent); }
  .mainnav::-webkit-scrollbar { display: none; }
  .nav { padding: 0.2rem var(--gutter) 0.6rem; width: max-content; }
  :root { --head-h: 7.6rem; }
  .cards, .why { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 52rem) {
  .c4, .c5, .c6, .c7, .c8 { grid-column: 1 / -1; }
  .cards, .cards.two-up, .why, .flow, .feats { grid-template-columns: minmax(0, 1fr); }
  .prow, .prow.flip { grid-template-columns: minmax(0, 1fr); }
  .prow.flip .prow-img { order: 0; }
  .hero-media { width: 100%; max-width: 30rem; margin: 0.5rem auto 0; }
  .stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .stats div, .stats div + div { padding: 1rem 0.8rem 0 0; border-left: 0; padding-left: 0; }
  .papers li { grid-template-columns: 2.5rem minmax(0, 1fr); }
  .papers li .link { grid-column: 2; }
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem 1.5rem; }
  .tel-row { grid-template-columns: minmax(0, 9rem) minmax(0, 1fr); }
  .pcr-band canvas.pcr { aspect-ratio: 4 / 3.4; }
  .foot-grid > :first-child, .foot-grid > :last-child { grid-column: 1 / -1; }
  .offices { grid-template-columns: minmax(0, 1fr); }
  .spec div { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .thumbs { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .aside { position: static; }
  .media-frame { position: static; }
  .head-actions .small-btn { display: none; }
  .scroll-cue { display: none; }
}
@media print {
  .site-head, .subnav, .band, canvas { display: none; }
  .js .reveal, .js .stagger > *, .js .kinetic .w > span { opacity: 1; transform: none; }
}

/* Founder block (layout from the Inogen founder page) */
.f-side { display: flex; flex-direction: column; gap: 0.9rem; }
.f-photo { margin: 0; border-radius: var(--r-card); overflow: hidden; }
.f-photo img { display: block; width: 100%; aspect-ratio: 4 / 5; object-fit: cover; }
.f-bar { height: 4px; border-radius: 2px; background: linear-gradient(90deg, var(--teal), var(--green)); }
.f-value { margin: 0; padding: 1.15rem 1.2rem; border-radius: var(--r-card); background: linear-gradient(115deg, var(--teal) 25%, var(--green)); color: var(--white); }
.f-value strong { display: block; font: 800 clamp(1.9rem, 1.5rem + 1.4vw, 2.5rem)/1 var(--display); letter-spacing: -0.02em; color: var(--white); }
.f-value span { display: block; margin-top: 0.35rem; font-size: 0.9rem; color: var(--white); opacity: 0.92; }
.f-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.7rem; margin: 0; }
.f-stats div { margin: 0; padding: 0.95rem 1rem; border-radius: var(--r-card); background: var(--mist); }
.f-stats dt { font: 800 1.6rem/1.1 var(--display); color: var(--teal); }
.f-stats dd { margin: 0.3rem 0 0; font-size: 0.86rem; color: var(--slate-2); line-height: 1.35; }
.f-name { color: var(--teal); font-size: clamp(2rem, 1.6rem + 1.6vw, 2.6rem); }
.founder .role { margin: 0.4rem 0 1.4rem; }
.f-ach-card { margin: 1.6rem 0 1.6rem; padding: 1.3rem 1.5rem; border-radius: var(--r-card); background: var(--mist); }
.f-ach-h { margin: 0 0 0.6rem; color: var(--green-ink); }
.f-ach { list-style: none; margin: 0; padding: 0; }
.f-ach li { position: relative; margin: 0.7rem 0 0; padding-left: 1.6rem; color: var(--slate-2); }
.f-ach li::before { content: ""; position: absolute; left: 0.15rem; top: 0.45em; width: 0.7rem; height: 0.38rem; border-left: 2px solid var(--green); border-bottom: 2px solid var(--green); transform: rotate(-45deg); }
@media (max-width: 52rem) { .f-side { max-width: 26rem; } }

/* Research page and leadership links */
.papers-page .paper { padding: 2rem 0; border-bottom: 1px solid var(--rule); }
.papers-page .paper:first-child { padding-top: 0; }
.paper-dl { margin: 1rem 0; display: grid; gap: 0.6rem; }
.paper-dl dt { font: 700 0.72rem/1.4 var(--display); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.paper-dl dd { margin: 0.2rem 0 0; }
.paper-links a { font-weight: 600; }
.link-list { list-style: none; margin: 0 0 1.6rem; padding: 0; display: grid; gap: 0.2rem; }
.link-list li { padding: 0.75rem 0; border-bottom: 1px solid var(--rule); }
.link-list a { font-weight: 600; text-decoration: none; }
.link-list a:hover { text-decoration: underline; }

/* Leadership career list */
.career { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.career li { background: var(--mist); border-radius: var(--r-card); padding: 1.2rem 1.2rem 1.3rem; }
.career h3 { font-size: 1.05rem; margin: 0.3rem 0; }
.career p { margin: 0; color: var(--slate-2); }
@media (max-width: 68rem) { .career { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 52rem) { .career { grid-template-columns: minmax(0, 1fr); } }

/* Founder photography and family-supplied event video on the leadership page. */
.leader-media-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(2rem, 5vw, 4.5rem) clamp(1rem, 3vw, 2.5rem); align-items: start; }
.leader-photo, .leader-video { margin: 0; }
.leader-photo img, .leader-video video { display: block; width: 100%; background: var(--mist); }
.leader-photo img { height: 100%; object-fit: cover; border-radius: var(--r-media); }
.leader-photo--1 { grid-column: 1 / span 6; }
.leader-photo--1 img { aspect-ratio: 4 / 3; }
.leader-photo--2 { grid-column: 7 / span 6; margin-top: clamp(2rem, 5vw, 5rem); }
.leader-photo--2 img { aspect-ratio: 3 / 2; }
.leader-photo--3 { grid-column: 1 / -1; }
.leader-photo--3 img { aspect-ratio: 2.16 / 1; }
.leader-photo--4 { grid-column: 1 / span 7; }
.leader-photo--4 img { aspect-ratio: 1.39 / 1; }
.leader-photo--5 { grid-column: 8 / span 5; margin-top: clamp(2rem, 5vw, 5rem); }
.leader-photo--5 img { aspect-ratio: 4 / 3; }
.leader-photo figcaption, .leader-video figcaption { margin-top: 0.75rem; color: var(--muted); font-size: 0.88rem; line-height: 1.5; }
.leader-video { grid-column: 2 / span 10; margin-top: clamp(0.5rem, 2vw, 2rem); }
.leader-video video { aspect-ratio: 16 / 9; object-fit: cover; border-radius: var(--r-media); }
.leader-video figcaption { display: grid; grid-template-columns: minmax(12rem, 0.8fr) minmax(0, 1.2fr); gap: 1rem 2rem; }
.leader-video figcaption strong { color: var(--ink); }
@media (max-width: 52rem) {
  .leader-photo--1, .leader-photo--2, .leader-photo--3, .leader-photo--4, .leader-photo--5, .leader-video { grid-column: 1 / -1; margin-top: 0; }
  .leader-video figcaption { grid-template-columns: minmax(0, 1fr); gap: 0.35rem; }
}

/* Photos inside articles */
.post-fig { margin: 2rem 0; }
.post-fig img { display: block; width: 100%; height: auto; border-radius: var(--r-card); }
.post-fig figcaption { margin-top: 0.6rem; font-size: 0.88rem; color: var(--muted); }
.post-fig.narrow, .post-fig:has(img[width="800"]) { max-width: 26rem; }