:root {
  --bg: #f6f7f5;
  --ink: #171816;
  --muted: #5e625b;
  --line: #d8ddd3;
  --panel: #ffffff;
  --accent: #2f6f62;
  --accent-dark: #184c43;
  --shadow: 0 18px 45px rgba(18, 28, 24, 0.12);
  --toggle-bg: rgba(255, 255, 255, 0.78);
  --toggle-ink: #16231f;
}

:root[data-theme="dark"] {
  --bg: #101312;
  --ink: #eff3ec;
  --muted: #b2baaf;
  --line: #303832;
  --panel: #181d1a;
  --accent: #86d9bf;
  --accent-dark: #b6f1de;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
  --toggle-bg: rgba(20, 25, 22, 0.78);
  --toggle-ink: #eef7f0;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.55;
}

.theme-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid rgba(128, 144, 134, 0.34);
  border-radius: 999px;
  background: var(--toggle-bg);
  color: var(--toggle-ink);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.14);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 750;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

.theme-toggle__icon {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--toggle-ink) 50%, transparent 50%);
  border: 2px solid var(--toggle-ink);
}

:root[data-theme="dark"] .theme-toggle__icon {
  background: linear-gradient(90deg, transparent 50%, var(--toggle-ink) 50%);
}

a {
  color: inherit;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
}

.hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 13vh;
  background: linear-gradient(to bottom, rgba(246, 247, 245, 0), var(--bg));
  z-index: -1;
}

.hero__video,
.hero__shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero__video {
  object-fit: cover;
  z-index: -3;
}

.hero__shade {
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.72), rgba(0, 0, 0, 0.28) 56%, rgba(0, 0, 0, 0.1)),
    linear-gradient(0deg, rgba(0, 0, 0, 0.58), rgba(0, 0, 0, 0.05) 48%);
  z-index: -2;
}

.hero__content {
  width: min(1100px, calc(100% - 40px));
  margin: 0 auto;
  padding: 0 0 16vh;
  color: #fff;
}

.venue,
.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.venue {
  color: #b9f1df;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(2.2rem, 7vw, 5.9rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3.1vw, 3rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 12px 0 0;
  font-size: 1rem;
  line-height: 1.3;
}

.authors {
  margin: 22px 0 24px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.08rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.links a {
  min-width: 92px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  text-align: center;
  text-decoration: none;
  font-weight: 750;
  backdrop-filter: blur(12px);
}

.links a:hover {
  background: rgba(255, 255, 255, 0.24);
}

main {
  padding: 42px 0 88px;
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 62px 0;
}

.section__header {
  max-width: 820px;
  margin-bottom: 28px;
}

.section__header p {
  max-width: 720px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.intro,
.mechanism {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 36px;
  align-items: center;
}

.intro__media img,
.feature-video,
.payload__video,
.video-grid video {
  display: block;
  width: 100%;
  border-radius: 8px;
  background: #111;
  box-shadow: var(--shadow);
}

.intro__media img {
  aspect-ratio: 16 / 11;
  object-fit: cover;
}

.intro__text p,
.mechanism__text p {
  color: var(--muted);
  font-size: 1.04rem;
}

.highlights {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.highlights article {
  min-height: 164px;
  padding: 22px;
  background: var(--panel);
}

.highlights strong,
.highlights span {
  display: block;
}

.highlights strong {
  margin-bottom: 10px;
  color: var(--accent-dark);
  font-size: 1.04rem;
}

.highlights span {
  color: var(--muted);
}

.mechanism {
  grid-template-columns: minmax(320px, 0.78fr) minmax(0, 1.22fr);
}

.feature-video,
.payload__video,
.video-grid video {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.video-grid article {
  min-width: 0;
}

.video-grid h3 {
  color: var(--accent-dark);
}

.interactive {
  padding-top: 26px;
}

.interactive__viewer {
  position: relative;
  aspect-ratio: 16 / 10;
  min-height: 480px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #0c100e;
  box-shadow: var(--shadow);
}

.interactive__viewer iframe {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 480px;
  border: 0;
  background: #0c100e;
}

.interactive__fallback {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.68);
  color: #fff;
  backdrop-filter: blur(10px);
}

.interactive__fallback .eyebrow {
  margin: 0;
  color: #b9f1df;
  font-size: 0.68rem;
}

.interactive__fallback a {
  color: #fff;
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
}

.interactive__fallback a:hover {
  text-decoration: underline;
}

.payload__video {
  max-height: 660px;
}

.payload__media {
  position: relative;
}

.payload__label {
  position: absolute;
  left: 18px;
  bottom: 18px;
  max-width: min(360px, calc(100% - 36px));
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.62);
  color: #fff;
  backdrop-filter: blur(10px);
}

.payload__label span,
.payload__label strong {
  display: block;
}

.payload__label span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.payload__label strong {
  margin-top: 3px;
  font-size: 1.06rem;
}

.citation {
  padding-bottom: 0;
}

pre {
  margin: 0;
  padding: 22px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #111713;
  color: #e8f3ea;
  font-size: 0.92rem;
  line-height: 1.45;
}

@media (max-width: 860px) {
  .hero {
    min-height: 86vh;
  }

  .hero__content {
    padding-bottom: 12vh;
  }

  .intro,
  .mechanism,
  .highlights,
  .video-grid {
    grid-template-columns: 1fr;
  }

  .highlights article {
    min-height: auto;
  }

  .interactive__viewer,
  .interactive__viewer iframe {
    min-height: 420px;
  }
}

@media (max-width: 520px) {
  .section,
  .hero__content {
    width: min(100% - 24px, 1120px);
  }

  .links a {
    flex: 1 1 44%;
  }

  .theme-toggle__text {
    display: none;
  }

  .interactive__viewer,
  .interactive__viewer iframe {
    min-height: 360px;
  }

  .interactive__fallback {
    right: 10px;
    bottom: 10px;
    left: 10px;
    justify-content: space-between;
  }
}