:root {
  color-scheme: light;
  --bg: #ffffff;
  --line: #d8d8d8;
  --line-strong: #111111;
  --text: #111111;
  --muted: #686868;
  --shadow: rgba(17, 17, 17, 0.06);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 999px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  background-image: radial-gradient(circle, rgba(17, 17, 17, 0.11) 0.9px, transparent 0.9px);
  background-size: 28px 28px;
  color: var(--text);
}

img {
  display: block;
  max-width: 100%;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.floating-header {
  position: fixed;
  inset: 18px 18px auto;
  z-index: 20;
  opacity: 0;
  transform: translateY(-16px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.floating-header.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.floating-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  box-shadow: 0 8px 30px var(--shadow);
}

.floating-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.floating-header__brand {
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

.floating-header__link {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  color: var(--muted);
}

.floating-header__auth {
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  cursor: pointer;
}

.hero,
.references {
  padding: 32px 24px 72px;
}

.hero__inner,
.references {
  max-width: var(--container);
  margin: 0 auto;
}

.hero {
  min-height: 100vh;
  padding-top: 110px;
  display: flex;
  align-items: center;
}

.hero__inner {
  text-align: center;
  width: 100%;
}

.hero__eyebrow,
.section-heading__eyebrow,
.modal__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero__title {
  margin: 18px 0 10px;
  font-size: clamp(3rem, 8vw, 7rem);
  line-height: 0.92;
  font-weight: 400;
  letter-spacing: -0.05em;
  background: linear-gradient(90deg, #2f8fff 0%, #6c5cff 34%, #e9418f 70%, #cf183f 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__description {
  margin: 0 auto;
  max-width: 700px;
  font-size: 18px;
  line-height: 1.6;
  color: var(--muted);
}

.hero__media {
  margin-top: 44px;
  display: flex;
  justify-content: center;
}

.reference-card,
.modal__panel {
  border: 1px solid var(--line-strong);
  background: var(--bg);
  border-radius: var(--radius-lg);
}

.video-embed {
  margin: 0 auto;
  width: min(100%, 720px);
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 48px var(--shadow);
}

.video-embed iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
}

.hero__github {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 180px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--bg);
}

.hero__github-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.section-heading {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
  justify-items: center;
  text-align: center;
}

.section-heading__title {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 0.98;
  font-weight: 400;
  letter-spacing: -0.04em;
}

.section-heading__copy {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  line-height: 1.6;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.reference-card {
  overflow: hidden;
  box-shadow: 0 14px 40px var(--shadow);
}

.reference-card__image-wrap {
  aspect-ratio: 4 / 4.6;
  background: #fafafa;
  position: relative;
}

.reference-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.reference-card__button {
  position: absolute;
  right: 14px;
  bottom: 14px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.94);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  cursor: pointer;
}

.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 24px;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(6px);
}

.modal__panel {
  position: relative;
  width: min(560px, 100%);
  padding: 22px;
  box-shadow: 0 24px 80px rgba(17, 17, 17, 0.1);
}

.modal__panel--wide {
  width: min(760px, 100%);
}

.modal__close {
  display: inline-flex;
  margin-left: auto;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
}

.modal__title {
  margin: 18px 0 10px;
  font-size: 30px;
  line-height: 1.05;
  font-weight: 400;
}

.modal__copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.modal__copy--small {
  margin-top: 14px;
  font-size: 14px;
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.modal__actions--split {
  justify-content: space-between;
  align-items: center;
}

.modal__button {
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  cursor: pointer;
}

.modal__button:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

.modal__feedback {
  min-height: 1em;
  color: var(--muted);
}

.json-viewer {
  margin: 20px 0 0;
  padding: 18px;
  max-height: 420px;
  overflow: auto;
  border-radius: calc(var(--radius-lg) - 10px);
  border: 1px solid var(--line);
  background: #fafafa;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.references__more {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.references__more-button {
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 12px 28px;
  text-transform: lowercase;
  cursor: pointer;
}

@media (max-width: 980px) {
  .reference-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .hero,
  .references {
    padding-inline: 16px;
  }

  .hero__github,
  .hero__secondary {
    width: 100%;
  }

  .reference-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .video-embed {
    width: 100%;
  }

  .modal {
    padding: 16px;
  }

  .modal__actions--split {
    align-items: stretch;
  }

  .modal__actions--split .modal__button {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .floating-header__link {
    display: none;
  }

  .reference-grid {
    grid-template-columns: 1fr;
  }
}