/* ==========================================================
   THE CIRCLE — scroll-driven landing page
   Design reference frame: 1440 x 926. --u = one design pixel.
   ========================================================== */
:root {
  --u: min(calc(100vw / 1440), calc(100vh / 926));
  --nav: #f2f2f2;
  --ink: #2f2f2f;
  --ink-soft: #5a5a5a;
  --font: "Sulphur Point", system-ui, sans-serif;
  --grain-url: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@font-face {
  font-family: "Sulphur Point";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/sulphur-point-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Sulphur Point";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/sulphur-point-latin-700-normal.woff2") format("woff2");
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: #161616;
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; color: inherit; }

.scroll-space { height: 1000vh; }

.stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
  isolation: isolate;
}

/* ---------- Backgrounds ---------- */
.bg { position: absolute; inset: 0; }
.bg-light { background: linear-gradient(180deg, #ececec 0%, #f6f6f6 100%); }
.bg-feat { background: linear-gradient(180deg, #8b8b8b 0%, #c9c9c9 45%, #f1f1f1 100%); }
.bg-dark {
  background:
    radial-gradient(ellipse 45% 18% at 50% 100%, rgba(255,255,255,.07), transparent 70%),
    linear-gradient(180deg, #151515 0%, #222 55%, #333 100%);
}

/* ---------- Orbit rings ---------- */
.rings {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.rings ellipse {
  fill: none;
  stroke: rgba(255,255,255,.32);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

/* ---------- Final-section guide lines ---------- */
.vlines span {
  position: absolute; top: 0; bottom: 0; width: 1px;
  background: rgba(0,0,0,.08);
  opacity: 0;
}
.vlines span:first-child { left: 26%; }
.vlines span:last-child { left: 76%; }

/* ---------- Sphere ---------- */
/* Sized once by JS (to its largest state) and then only moved/scaled with
   transforms, so scrolling never re-lays-out or repaints it. */
.sphere {
  position: absolute;
  left: 0; top: 0;
  width: 600px; height: 600px;
  border-radius: 50%;
  z-index: 5;
  will-change: transform;
  --s-hi: #8c8c8c; --s-mid: #3b3b3b; --s-lo: #0e0e0e;
  --gloss: .15; --grain: .45; --carbon: 0;
}
.sphere > div { position: absolute; inset: 0; border-radius: 50%; }
.sphere__shadow { will-change: opacity; }
.sphere__shadow--drop { box-shadow: 0 60px 120px 0 rgba(0,0,0,.55); }
.sphere__shadow--halo { box-shadow: 0 0 150px 30px rgba(0,0,0,.3); opacity: 0; }
/* Light direction = rotation of this layer (cheap), instead of re-painting a gradient */
.sphere__light { overflow: hidden; will-change: transform; transform: rotate(-35deg); }
.sphere__light > div { position: absolute; inset: 0; }
.sphere__body {
  background: radial-gradient(circle at 50% 13%, var(--s-hi) 0%, var(--s-mid) 50%, var(--s-lo) 88%);
}
.sphere__grain {
  background-image: var(--grain-url);
  background-size: 220px;
  mix-blend-mode: overlay;
  opacity: var(--grain);
}
.sphere__carbon {
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,.18) 0 3px, transparent 3px 6px),
    repeating-linear-gradient(-45deg, rgba(0,0,0,.5) 0 3px, transparent 3px 6px);
  mix-blend-mode: overlay;
  opacity: var(--carbon);
}
.sphere__gloss {
  background: radial-gradient(circle at 50% 16%, rgba(255,255,255,.75) 0%, rgba(255,255,255,.18) 9%, transparent 26%);
  opacity: var(--gloss);
  mix-blend-mode: screen;
}

/* hotspot dots on the sphere surface */
.dot {
  position: absolute;
  width: calc(var(--u) * 16); height: calc(var(--u) * 16);
  margin: calc(var(--u) * -8) 0 0 calc(var(--u) * -8);
  border-radius: 50%;
  background: #f4f4f4;
  box-shadow: 0 0 0 calc(var(--u) * 4) rgba(255,255,255,.28), 0 0 14px rgba(255,255,255,.5);
  opacity: 0;
  z-index: 2;
}
.dot::after {
  content: ""; position: absolute; inset: 30%;
  border-radius: 50%; background: #9a9a9a;
}
#dotA1 { left: 92.6%; top: 40.8%; }
#dotA2 { left: 87.8%; top: 68.4%; }
#dotB1 { left: 4.6%;  top: 38.5%; }
#dotB2 { left: 26.2%; top: 57%; }

/* ---------- Hero ---------- */
.hero-title {
  position: absolute;
  inset: 0;
  margin: 0;
  padding-bottom: calc(var(--u) * 12);
  display: flex; justify-content: center; align-items: center; gap: .42em;
  font-weight: 700;
  font-size: calc(var(--u) * 234);
  line-height: 1;
  letter-spacing: -.01em;
  text-align: center;
  pointer-events: none;
}
.title-fill { color: #3a3a3a; z-index: 4; }
.title-outline {
  z-index: 6;
  color: transparent;
  -webkit-text-stroke: calc(var(--u) * 1.6) rgba(235,235,235,.95);
  clip-path: circle(0px at 50% 50%);
}

.hero-ui {
  position: absolute; inset: 0;
  z-index: 7;
  pointer-events: none;
}
.hero-ui > * { pointer-events: auto; }
.lives {
  position: absolute;
  left: 50%; top: calc(50% - var(--u) * 172);
  transform: translateX(-50%);
  margin: 0;
  display: flex; align-items: center; gap: calc(var(--u) * 14);
  white-space: nowrap;
  font-size: calc(var(--u) * 28);
  word-spacing: .12em;
  color: #e4e4e4;
}
.avatars { display: inline-flex; }
.avatars img {
  width: calc(var(--u) * 36); height: calc(var(--u) * 36);
  border-radius: 50%; object-fit: cover;
  border: 1px solid rgba(0,0,0,.4);
}
.avatars img + img { margin-left: calc(var(--u) * -14); }

.hero-buy {
  position: absolute;
  left: 50%; top: calc(50% + var(--u) * 162);
  transform: translateX(-50%);
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: calc(var(--u) * 14);
  padding: calc(var(--u) * 6) calc(var(--u) * 6) calc(var(--u) * 6) calc(var(--u) * 20);
  border-radius: 999px;
  font-size: calc(var(--u) * 19);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .3s, transform .3s;
}
.btn__arrow {
  position: relative;
  width: calc(var(--u) * 36); height: calc(var(--u) * 36);
  border-radius: 50%;
  transition: transform .3s;
}
.btn__arrow::before {
  content: ""; position: absolute; inset: 0; margin: auto;
  width: 45%; height: 45%;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M1 8h13M9 3l5 5-5 5' fill='none' stroke='black' stroke-width='1.6'/%3E%3C/svg%3E") center / contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M1 8h13M9 3l5 5-5 5' fill='none' stroke='black' stroke-width='1.6'/%3E%3C/svg%3E") center / contain no-repeat;
}
.btn:hover .btn__arrow { transform: translateX(3px); }
.btn-light {
  color: #f2f2f2;
  border: 1px solid rgba(255,255,255,.75);
  background: rgba(0,0,0,.15);
}
.btn-light .btn__arrow { background: #f4f4f4; color: #222; }
.btn-light:hover { background: rgba(255,255,255,.12); }
.btn-dark {
  color: #333;
  border: 1px solid #555;
  background: rgba(255,255,255,.4);
}
.btn-dark .btn__arrow { background: #3a3a3a; color: #f2f2f2; }
.btn-dark:hover { background: rgba(255,255,255,.9); }

/* hero side cards */
.card-track, .card-testi {
  position: absolute;
  z-index: 8;
  color: #e9e9e9;
  background: rgba(62,62,62,.82);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: calc(var(--u) * 14);
}
.card-track {
  left: calc(var(--u) * 18);
  bottom: calc(var(--u) * 20);
  width: calc(var(--u) * 158);
  height: calc(var(--u) * 240);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: calc(var(--u) * 26);
  font-size: calc(var(--u) * 19);
  text-decoration: none;
}
.card-track span { text-decoration: underline; text-underline-offset: 3px; }
.card-track .cube { width: calc(var(--u) * 66); height: calc(var(--u) * 66); }
.card-testi {
  right: calc(var(--u) * 14);
  bottom: calc(var(--u) * 20);
  width: calc(var(--u) * 388);
  margin: 0;
  padding: calc(var(--u) * 30) calc(var(--u) * 38) calc(var(--u) * 30) calc(var(--u) * 38);
}
.card-testi h3 { margin: 0 0 calc(var(--u) * 22); font-weight: 400; font-size: calc(var(--u) * 23); }
.card-testi blockquote { margin: 0 0 calc(var(--u) * 22); font-size: calc(var(--u) * 16); line-height: 1.25; color: #d6d6d6; }
.card-testi figcaption { display: flex; align-items: center; gap: calc(var(--u) * 10); font-size: calc(var(--u) * 16); color: #cfcfcf; }
.card-testi figcaption img { width: calc(var(--u) * 28); height: calc(var(--u) * 28); border-radius: 50%; }
.card-testi figcaption a { text-underline-offset: 3px; color: #f2f2f2; }

/* ---------- Feature cards + connector lines ---------- */
.links {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 9;
  pointer-events: none;
}
.links path { fill: none; stroke-width: 1.2; }
#lineA1, #lineA2 { stroke: rgba(255,255,255,.95); }
#lineB1, #lineB2 { stroke: rgba(60,60,60,.85); }

.fcard {
  position: absolute;
  z-index: 10;
  width: calc(var(--u) * 450);
  padding: calc(var(--u) * 24) calc(var(--u) * 28) calc(var(--u) * 26);
  border-radius: calc(var(--u) * 14);
  opacity: 0;
}
.fcard h3 {
  margin: 0 0 calc(var(--u) * 14);
  padding-bottom: calc(var(--u) * 14);
  font-weight: 400;
  font-size: calc(var(--u) * 33);
  border-bottom: 1px solid currentColor;
  border-image: linear-gradient(90deg, rgba(128,128,128,.5), rgba(128,128,128,.3)) 1;
}
.fcard p { margin: 0; font-size: calc(var(--u) * 18); line-height: 1.2; }
.fcard-light {
  background: rgba(247,247,247,.92);
  color: #333;
  box-shadow: 0 10px 40px rgba(0,0,0,.08);
}
.fcard-light p { color: #4d4d4d; }
.fcard-dark {
  color: #f1f1f1;
  background:
    var(--grain-url) 0 0 / 220px,
    linear-gradient(135deg, #4e4e4e 0%, #6e6e6e 60%, #7d7d7d 100%);
  background-blend-mode: overlay, normal;
  box-shadow: 0 10px 40px rgba(0,0,0,.15);
}
.fcard-dark p { color: #dcdcdc; }
#cardA1 { left: 58.5%; top: 30%; }
#cardA2 { left: 63%;   top: 65%; }
#cardB1 { left: 7.6%;  top: 17%; }
#cardB2 { left: 13.4%; top: 61%; }

/* ---------- Configurator ---------- */
.config {
  position: absolute;
  z-index: 4; /* sphere passes in front while it travels, as in the recording */
  left: 59%;
  top: 27%;
  width: calc(var(--u) * 545);
  opacity: 0;
}
.config h2 {
  margin: 0 0 calc(var(--u) * 38);
  font-weight: 400;
  font-size: calc(var(--u) * 46);
  line-height: 1.12;
  color: #3a3a3a;
}
.config h2 b { font-weight: 700; }
.opt-group h4 {
  margin: 0 0 calc(var(--u) * 10);
  padding-bottom: calc(var(--u) * 8);
  font-weight: 400;
  font-size: calc(var(--u) * 24);
  color: #404040;
  border-bottom: 1px solid #b9b9b9;
}
.opt-group + .opt-group { margin-top: calc(var(--u) * 20); }
.opts { display: flex; flex-wrap: wrap; gap: calc(var(--u) * 8) calc(var(--u) * 26); }
.opts button {
  display: inline-flex; align-items: center; gap: calc(var(--u) * 8);
  padding: 2px 0;
  border: 0; background: none;
  font-size: calc(var(--u) * 16);
  color: #555;
  cursor: pointer;
}
.opts button i {
  width: calc(var(--u) * 15); height: calc(var(--u) * 15);
  border-radius: 50%;
  border: 1px solid #9a9a9a;
  transition: background-color .25s, border-color .25s;
}
.opts button[aria-checked="true"] { color: #333; }
.opts button[aria-checked="true"] i { background: #333; border-color: #333; }
.opts button:hover i { border-color: #333; }
.opts button:focus-visible, .btn:focus-visible, .diam input:focus-visible { outline: 2px solid #777; outline-offset: 3px; }

.config__foot { display: flex; align-items: center; justify-content: space-between; margin-top: calc(var(--u) * 12); }
.diam { display: inline-flex; align-items: center; gap: calc(var(--u) * 8); font-size: calc(var(--u) * 16); color: #555; }
.diam input {
  width: calc(var(--u) * 52);
  padding: calc(var(--u) * 3) calc(var(--u) * 8);
  border: 1px solid #a9a9a9; border-radius: 999px;
  background: transparent;
  font: inherit; color: #333; text-align: center;
  -moz-appearance: textfield;
}
.diam input::-webkit-inner-spin-button, .diam input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.price { font-size: calc(var(--u) * 16); padding-left: calc(var(--u) * 16); margin-top: calc(var(--u) * 22); }
.price .btn__arrow { width: calc(var(--u) * 30); height: calc(var(--u) * 30); }
.price.added { transform: scale(.96); }

/* ---------- Final CTA ---------- */
.final {
  position: absolute;
  z-index: 4;
  left: 0; right: 0; top: 18.6%;
  text-align: center;
  opacity: 0;
}
.final h2 {
  margin: 0;
  font-weight: 400;
  font-size: calc(var(--u) * 92);
  letter-spacing: .005em;
  word-spacing: .06em;
  color: #3a3a3a;
}
.final p { margin: calc(var(--u) * 10) 0 calc(var(--u) * 24); font-size: calc(var(--u) * 17); color: #555; }
.final .btn { font-size: calc(var(--u) * 16); }
.final .btn__arrow { width: calc(var(--u) * 30); height: calc(var(--u) * 30); }

/* ---------- Nav ---------- */
.nav {
  position: absolute;
  z-index: 20;
  left: 0; right: 0; top: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(var(--u) * 30) calc(var(--u) * 30) 0;
  color: var(--nav);
}
.nav__links { position: absolute; left: 50%; transform: translateX(-50%); display: flex; gap: calc(var(--u) * 37); }
.nav__links a { text-decoration: none; font-size: calc(var(--u) * 19); opacity: .95; }
.nav__links a:hover { text-decoration: underline; text-underline-offset: 4px; }
.nav__icon { position: relative; display: block; width: calc(var(--u) * 40); height: calc(var(--u) * 40); }
.nav__icon svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.nav__cart { width: calc(var(--u) * 30); height: calc(var(--u) * 30); }
.nav__cart em {
  position: absolute; top: -6px; right: -8px;
  min-width: 16px; height: 16px; padding: 0 4px;
  border-radius: 8px;
  background: #333; color: #fff;
  font: 700 10px/16px var(--font); font-style: normal; text-align: center;
}

/* ---------- Mobile ---------- */
@media (max-width: 767px) {
  :root { --u: calc(100vw / 390); }

  .hero-title { flex-direction: column; gap: 0; font-size: 22vw; line-height: .95; padding-bottom: 0; }
  .lives { top: calc(50% - 31vw - 46px); font-size: 17px; gap: 10px; }
  .avatars img { width: 28px; height: 28px; }
  .avatars img + img { margin-left: -10px; }
  .hero-buy { top: calc(50% + 28vw); font-size: 16px; }
  .btn { font-size: 15px; gap: 10px; padding: 5px 5px 5px 16px; }
  .btn__arrow, .price .btn__arrow, .final .btn__arrow { width: 30px; height: 30px; }

  .card-track { display: none; }
  .card-testi { left: 16px; right: 16px; width: auto; bottom: 16px; padding: 16px 18px; border-radius: 14px; }
  .card-testi h3 { font-size: 17px; margin-bottom: 8px; }
  .card-testi blockquote { font-size: 13px; margin-bottom: 10px; }
  .card-testi figcaption { font-size: 13px; }
  .card-testi figcaption img { width: 22px; height: 22px; }

  .fcard { width: auto; left: 16px !important; right: 16px; padding: 16px 18px; border-radius: 14px; }
  .fcard h3 { font-size: 21px; margin-bottom: 8px; padding-bottom: 8px; }
  .fcard p { font-size: 14px; }
  #cardA1, #cardB1 { top: 52%; }
  #cardA2, #cardB2 { top: 72%; }
  #dotA1 { left: 62%; top: 94%; }
  #dotB1 { left: 38%; top: 94%; }
  #dotA2, #dotB2 { display: none; }

  .config { left: 16px; right: 16px; width: auto; top: auto; bottom: 28px; }
  .config h2 { font-size: 28px; margin-bottom: 18px; }
  .opt-group h4 { font-size: 17px; }
  .opts { gap: 8px 16px; }
  .opts button { font-size: 14px; gap: 6px; }
  .opts button i { width: 13px; height: 13px; }
  .diam, .price { font-size: 14px; }
  .diam input { width: 48px; }

  .final { top: 18%; padding: 0 16px; }
  .final h2 { font-size: 11vw; }
  .final p { font-size: 14px; }
  .final .btn { font-size: 15px; }
  .vlines span:first-child { left: 12%; }
  .vlines span:last-child { left: 88%; }

  .nav { padding: 16px 16px 0; color: #f2f2f2; mix-blend-mode: difference; }
  .nav__links { gap: 20px; }
  .nav__links a { font-size: 15px; }
  .nav__icon { width: 30px; height: 30px; }
  .nav__cart { width: 24px; height: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .btn, .btn__arrow { transition: none; }
}