:root {
  --ink: #090a09;
  --paper: #f2f0e9;
  --muted: #a7aaa4;
  --line: #30332f;
  --acid: #c7ff25;
  --orange: #ff5a24;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site-header {
  height: 78px;
  padding: 0 4vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  position: absolute;
  z-index: 20;
  width: 100%;
}
.brand { font-size: 22px; letter-spacing: -1.4px; }
.brand b { color: var(--acid); }
nav {
  display: flex;
  align-items: center;
  gap: 30px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
}
.nav-buy { border: 1px solid #62665e; padding: 12px 16px; }
.menu { display: none; background: none; border: 0; color: white; }

.hero {
  min-height: 760px;
  height: min(900px, 100vh);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 77% 46%, rgba(199, 255, 37, .13), transparent 27%),
    linear-gradient(110deg, #070807 0%, #0a0b09 58%, #151911 100%);
}
.hero-grid {
  position: absolute;
  inset: 0;
  opacity: .22;
  background-image:
    linear-gradient(rgba(255,255,255,.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.12) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(90deg, transparent 0, transparent 45%, #000 74%);
}
.hero-copy {
  position: absolute;
  z-index: 4;
  left: 6vw;
  top: 51%;
  transform: translateY(-45%);
  max-width: 780px;
}
.eyebrow, .section-index {
  font-size: 11px;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: #b8bbb4;
}
.eyebrow i {
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--acid);
  border-radius: 50%;
  margin-right: 10px;
}
.hero h1 {
  font-size: clamp(56px, 7vw, 112px);
  line-height: .84;
  letter-spacing: -6px;
  margin: 28px 0;
  font-weight: 900;
}
.hero h1 em, .guide h1 em {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 1px #dfe1da;
}
.lede {
  font-size: 18px;
  line-height: 1.55;
  max-width: 540px;
  color: #c7cac3;
}
.actions { display: flex; gap: 26px; align-items: center; margin-top: 38px; }
.button {
  display: inline-flex;
  gap: 35px;
  align-items: center;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1.3px;
}
.button.primary {
  background: var(--acid);
  color: #0a0b09;
  padding: 17px 20px;
  font-weight: bold;
}
.button.text { border-bottom: 1px solid #777b73; padding: 13px 0; }
.hero-products {
  position: absolute;
  z-index: 3;
  right: -1%;
  top: 10%;
  width: min(54vw, 790px);
  height: 82%;
}
.hero-products figure { margin: 0; }
.hero-hume {
  position: absolute;
  width: 78%;
  right: 0;
  top: 5%;
  filter: drop-shadow(0 35px 44px rgba(0,0,0,.58));
}
.hero-hume img { width: 100%; height: auto; }
.hero-products figcaption {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 9px;
  line-height: 1.3;
  letter-spacing: 1.2px;
  color: #9fa39b;
}
.hero-products figcaption b { color: var(--acid); }
.hero-hume figcaption { right: 10%; top: 17%; }
.hero-fitbit {
  position: absolute;
  z-index: 4;
  width: 31%;
  right: 7%;
  bottom: 1%;
  background: #e9e7df;
  padding: 12px 12px 44px;
  transform: rotate(2deg);
  box-shadow: 0 25px 55px rgba(0,0,0,.55);
}
.hero-fitbit img { width: 100%; height: auto; aspect-ratio: 1; object-fit: contain; }
.hero-fitbit figcaption {
  left: 14px;
  right: 10px;
  bottom: 11px;
  color: #72766f;
}
.hero-fitbit figcaption b { color: #111; }
.hero-note {
  position: absolute;
  right: 3vw;
  bottom: 22px;
  z-index: 6;
  color: #868a82;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.manifesto, .collections, .products, .material, .fit-check { padding: 110px 6vw; }
.manifesto { background: var(--paper); color: var(--ink); }
.manifesto .section-index, .collections .section-index, .products .section-index,
.material .section-index, .fit-check .section-index { color: #73776f; }
.manifesto h2, .section-head h2, .material h2, .fit-check h2 {
  font-size: clamp(42px, 5vw, 76px);
  line-height: .98;
  letter-spacing: -3px;
  margin: 28px 0 70px;
}
.manifesto h2 span { color: #969991; }
.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 50px;
  border-top: 1px solid #c7c8c2;
  padding-top: 30px;
}
.principles b { font-size: 11px; color: #777; }
.principles h3 { font-size: 22px; margin-top: 50px; }
.principles p { color: #5b5e58; line-height: 1.55; max-width: 300px; }

.collections { background: #111310; }
.section-head { display: flex; justify-content: space-between; align-items: end; }
.section-head > p {
  max-width: 390px;
  color: #9da098;
  line-height: 1.6;
  margin-bottom: 76px;
}
.collection-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: #3a3d37;
}
.collection {
  min-height: 560px;
  background: #181a17;
  padding: 50px;
  position: relative;
  overflow: hidden;
}
.collection:after {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  border: 50px solid #252822;
  border-radius: 50%;
  right: -100px;
  bottom: -115px;
}
.collection.fitbit:after {
  border-radius: 34%;
  border-color: #23251f;
  transform: rotate(35deg);
}
.badge {
  display: inline-block;
  background: var(--acid);
  color: #111;
  padding: 7px 9px;
  font-size: 9px;
  letter-spacing: 1.4px;
}
.badge.soft { background: var(--orange); color: white; }
.collection > p:not(.warning) {
  margin-top: 55px;
  font-size: 11px;
  letter-spacing: 1.8px;
  color: #969990;
}
.collection h3 { font-size: 48px; line-height: 1; margin: 14px 0 32px; }
.collection ul { list-style: none; padding: 0; line-height: 2; color: #b9bcb5; }
.collection ul li:before { content: "—"; color: var(--acid); margin-right: 12px; }
.collection .warning { color: #f2c2ae; font-size: 12px; }
.collection > a {
  position: absolute;
  z-index: 1;
  left: 50px;
  bottom: 45px;
  border-bottom: 1px solid #666;
  padding-bottom: 7px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.products { background: #e9e7df; color: #10120f; }
.product-head > p { color: #61645e; }
.product-group { margin-top: 50px; scroll-margin-top: 40px; }
.product-group + .product-group { margin-top: 105px; }
.product-group-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0 0 18px;
  border-bottom: 1px solid #bcbeb7;
}
.product-group-title h3 {
  font-size: 29px;
  letter-spacing: -1px;
  margin: 0;
}
.product-group-title span {
  color: #6f726b;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-left: 1px solid #c9cbc4;
}
.product-card {
  min-width: 0;
  border-right: 1px solid #c9cbc4;
  border-bottom: 1px solid #c9cbc4;
  padding: 22px;
  display: flex;
  flex-direction: column;
}
.product-image {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  overflow: hidden;
  background: #e9e7df;
}
.product-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform .35s ease;
}
.product-image:hover img { transform: scale(1.035); }
.product-info { padding-top: 24px; display: flex; flex-direction: column; flex: 1; }
.product-info > p {
  margin: 0 0 11px;
  color: #6d7069;
  font-size: 9px;
  letter-spacing: 1.5px;
}
.product-info h4 { font-size: 21px; letter-spacing: -.5px; margin: 0 0 10px; }
.product-info > span { color: #676a64; font-size: 13px; line-height: 1.5; min-height: 40px; }
.product-info > a {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid #bfc1ba;
  margin-top: 25px;
  padding-top: 14px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
}
.product-info > a b { color: #465800; }
.fitbit-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.material {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 10vw;
  background: var(--paper);
  color: var(--ink);
}
.material-list article {
  padding: 25px 0 28px;
  border-top: 1px solid #c4c6bf;
  display: grid;
  grid-template-columns: 90px 1fr 1.4fr;
  align-items: start;
  gap: 20px;
}
.material-list span { font-size: 10px; letter-spacing: 1.5px; }
.material-list h3 { margin: 0; font-size: 20px; }
.material-list p { margin: 0; color: #656862; line-height: 1.5; }
.fit-check { text-align: center; }
.fit-check h2 { margin-bottom: 50px; }
.fit-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: #383b35;
  text-align: left;
  margin: 0 auto 50px;
  max-width: 1050px;
}
.fit-steps div { background: #141613; padding: 36px; }
.fit-steps b { color: var(--acid); }
.fit-steps p { line-height: 1.5; color: #b9bcb5; }

footer {
  padding: 55px 6vw;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 25px;
  align-items: start;
}
footer p { margin: 0; color: #92968e; }
footer > div {
  display: flex;
  gap: 22px;
  justify-content: flex-end;
  font-size: 12px;
  text-transform: uppercase;
}
footer small {
  grid-column: 1/-1;
  color: #686c64;
  line-height: 1.5;
  margin-top: 25px;
}

.guide-page .site-header { position: relative; }
.guide { padding: 90px 8vw 120px; }
.guide h1 {
  font-size: clamp(58px, 8vw, 118px);
  line-height: .88;
  letter-spacing: -6px;
  margin: 30px 0;
}
.compat-table { margin-top: 80px; border-top: 1px solid #565a52; }
.compat-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr .6fr;
  gap: 30px;
  padding: 24px 10px;
  border-bottom: 1px solid #3b3e39;
  align-items: center;
}
.compat-row.head {
  font-size: 10px;
  letter-spacing: 1.5px;
  color: #858981;
}
.compat-row > span { color: #aeb1aa; }
.compat-row b { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; }
.yes { color: var(--acid); }
.no { color: #ff7d54; }
.check { color: #e8de9e; }
.guide-notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: #33362f;
  margin-top: 70px;
}
.guide-notes article { background: #151714; padding: 45px; }
.guide-notes h2 { font-size: 30px; }
.guide-notes p { color: #aaada5; line-height: 1.7; }
.guide-notes a {
  display: inline-block;
  margin-top: 15px;
  border-bottom: 1px solid #777;
  padding-bottom: 6px;
  font-size: 11px;
  text-transform: uppercase;
}
.device-note { color: #777b73; font-size: 12px; margin-top: 30px; }

@media (max-width: 1050px) {
  .hero-copy { max-width: 640px; }
  .hero-products { width: 54vw; right: -8%; }
  .hero-hume { width: 86%; }
  .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .site-header { height: 66px; padding: 0 20px; }
  .site-header nav {
    display: none;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    background: #0b0c0b;
    padding: 25px;
    flex-direction: column;
    align-items: flex-start;
  }
  .site-header.open nav { display: flex; }
  .menu { display: block; }
  .hero { min-height: 780px; height: 100vh; }
  .hero-grid { mask-image: none; opacity: .12; }
  .hero-copy { left: 22px; right: 22px; top: 36%; z-index: 8; }
  .hero h1 { font-size: 50px; letter-spacing: -3px; }
  .lede { font-size: 16px; max-width: 86%; }
  .actions { align-items: flex-start; flex-direction: column; gap: 13px; }
  .hero-products {
    width: 92vw;
    height: 49%;
    right: -14vw;
    top: auto;
    bottom: -2%;
    opacity: .68;
  }
  .hero-hume { width: 82%; right: 12%; top: 0; }
  .hero-hume figcaption { display: none; }
  .hero-fitbit { width: 31%; right: 6%; bottom: 4%; }
  .hero-fitbit figcaption { display: none; }
  .hero-note { left: 22px; right: auto; max-width: 270px; }
  .manifesto, .collections, .products, .material, .fit-check { padding: 75px 22px; }
  .manifesto h2, .section-head h2, .material h2, .fit-check h2 {
    letter-spacing: -2px;
    margin-bottom: 50px;
  }
  .principles { grid-template-columns: 1fr; gap: 25px; }
  .principles h3 { margin-top: 18px; }
  .section-head { display: block; }
  .section-head > p { margin: 0 0 45px; }
  .collection-grid { grid-template-columns: 1fr; }
  .collection { padding: 35px 25px; min-height: 520px; }
  .collection h3 { font-size: 40px; }
  .collection > a { left: 25px; right: 25px; }
  .product-group { margin-top: 25px; }
  .product-group + .product-group { margin-top: 70px; }
  .product-group-title h3 { font-size: 23px; }
  .product-grid, .fitbit-grid { grid-template-columns: 1fr 1fr; }
  .product-card { padding: 10px 10px 20px; }
  .product-info { padding-top: 16px; }
  .product-info h4 { font-size: 17px; }
  .product-info > span { font-size: 12px; min-height: 54px; }
  .product-info > a { font-size: 9px; }
  .material { grid-template-columns: 1fr; }
  .material-list article { grid-template-columns: 70px 1fr; }
  .material-list p { grid-column: 2; }
  .fit-steps { grid-template-columns: 1fr; }
  .fit-steps div { padding: 25px; }
  footer { grid-template-columns: 1fr; }
  footer > div { justify-content: flex-start; }
  footer small { grid-column: 1; }
  .guide { padding: 65px 22px; }
  .guide h1 { font-size: 54px; letter-spacing: -3px; }
  .compat-row { grid-template-columns: 1fr; padding: 22px 0; gap: 7px; }
  .compat-row.head { display: none; }
  .guide-notes { grid-template-columns: 1fr; }
}