:root {
  --ice: #b8e3e9;
  --mist: #93b1b5;
  --teal: #4f7c82;
  --deep: #0b2e33;
  --paper: #f7fbfb;
  --white: #ffffff;
  --ink: #071f23;
  --line: rgba(11, 46, 51, 0.16);
  --shadow: 0 24px 60px rgba(11, 46, 51, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, Arial, sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.site-header {
  align-items: center;
  background: rgba(247, 251, 251, 0.9);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  left: 0;
  padding: 18px clamp(20px, 5vw, 72px);
  position: sticky;
  right: 0;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
}

.brand {
  align-items: center;
  display: inline-flex;
  font-weight: 900;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  background: linear-gradient(135deg, var(--ice), var(--teal));
  border: 2px solid var(--deep);
  border-radius: 999px;
  display: inline-block;
  height: 18px;
  width: 18px;
}

.site-nav {
  display: flex;
  gap: 8px;
}

.site-nav a {
  border-radius: 999px;
  font-weight: 800;
  padding: 9px 14px;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav .active {
  background: var(--deep);
  color: var(--white);
  outline: none;
}

main {
  overflow: hidden;
}

.hero,
.video-hero,
.team-hero {
  display: grid;
  gap: clamp(28px, 5vw, 72px);
  margin: 0 auto;
  max-width: 1180px;
  padding: clamp(54px, 8vw, 110px) clamp(20px, 5vw, 48px);
}

.hero {
  align-items: center;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
}

.video-hero {
  align-items: center;
  grid-template-columns: minmax(250px, 0.76fr) minmax(0, 1fr);
  max-width: 1240px;
  padding-top: clamp(28px, 5vw, 70px);
}

.video-frame {
  background: var(--deep);
  border: 10px solid var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow);
  justify-self: center;
  max-width: 520px;
  overflow: hidden;
  position: relative;
  width: min(100%, 390px);
}

.video-frame iframe,
.video-frame img {
  aspect-ratio: 9 / 16;
  border: 0;
  display: block;
  object-fit: cover;
  width: 100%;
}

.video-link {
  color: var(--white);
  text-decoration: none;
}

.video-link:hover,
.video-link:focus-visible {
  box-shadow: 0 0 0 5px rgba(79, 124, 130, 0.32), var(--shadow);
  outline: none;
}

.youtube-play {
  align-items: center;
  background: #ff0000;
  border-radius: 18px;
  display: flex;
  height: 58px;
  justify-content: center;
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 82px;
}

.youtube-play::before {
  border-bottom: 13px solid transparent;
  border-left: 20px solid var(--white);
  border-top: 13px solid transparent;
  content: "";
  display: block;
  margin-left: 5px;
}

.youtube-label {
  background: rgba(11, 46, 51, 0.88);
  border-radius: 999px;
  bottom: 14px;
  font-weight: 900;
  left: 50%;
  padding: 9px 14px;
  position: absolute;
  transform: translateX(-50%);
  white-space: nowrap;
}

.video-hero-copy h1 {
  font-size: clamp(3rem, 8vw, 7.4rem);
}

.team-hero {
  padding-bottom: 34px;
  text-align: center;
}

.team-hero p:last-child {
  margin-inline: auto;
  max-width: 680px;
}

.eyebrow {
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  color: var(--deep);
  font-size: clamp(3.7rem, 11vw, 9.5rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 0.86;
  margin-bottom: 24px;
  max-width: 760px;
}

.team-hero h1 {
  margin-inline: auto;
}

h2 {
  color: var(--deep);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 900;
  line-height: 1;
  margin-bottom: 14px;
}

.mission,
.team-hero p {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  max-width: 640px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  border: 2px solid var(--deep);
  border-radius: 999px;
  display: inline-flex;
  font-weight: 900;
  justify-content: center;
  min-width: 144px;
  padding: 13px 19px;
  text-decoration: none;
}

.button.primary {
  background: var(--deep);
  color: var(--white);
}

.button.secondary {
  background: var(--ice);
  color: var(--deep);
}

.button:hover,
.button:focus-visible {
  box-shadow: 0 0 0 4px rgba(79, 124, 130, 0.28);
  outline: none;
  transform: translateY(-1px);
}

.hero-media,
.image-card,
.team-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-media {
  margin: 0;
  padding: 16px;
}

.hero-media figcaption,
.image-card figcaption {
  color: var(--teal);
  font-size: 0.9rem;
  font-weight: 700;
  margin-top: 12px;
}

.solar-array {
  aspect-ratio: 4 / 3;
  background:
    linear-gradient(160deg, rgba(184, 227, 233, 0.74), rgba(255, 255, 255, 0) 48%),
    linear-gradient(145deg, #ffffff 0%, var(--ice) 54%, var(--mist) 100%);
  border-radius: 6px;
  min-height: 320px;
  overflow: hidden;
  position: relative;
}

.sun {
  background: #ffffff;
  border: 16px solid rgba(11, 46, 51, 0.08);
  border-radius: 50%;
  height: 148px;
  position: absolute;
  right: 7%;
  top: 10%;
  width: 148px;
}

.panel {
  background:
    linear-gradient(90deg, transparent 0 30%, rgba(255, 255, 255, 0.22) 30% 33%, transparent 33% 63%, rgba(255, 255, 255, 0.2) 63% 66%, transparent 66%),
    linear-gradient(180deg, rgba(184, 227, 233, 0.36), rgba(11, 46, 51, 0.1)),
    var(--deep);
  border: 3px solid rgba(255, 255, 255, 0.72);
  bottom: 11%;
  height: 34%;
  position: absolute;
  transform: skewY(-8deg);
  width: 34%;
}

.panel-one {
  left: 10%;
}

.panel-two {
  left: 33%;
}

.panel-three {
  left: 56%;
}

.project-story {
  background: var(--deep);
  color: var(--white);
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(3, 1fr);
}

.project-story article {
  background: var(--deep);
  min-height: 260px;
  padding: clamp(28px, 5vw, 56px);
}

.project-story h2 {
  color: var(--white);
}

.project-story p {
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 0;
  max-width: 430px;
}

.section-number {
  color: var(--ice);
  display: block;
  font-weight: 900;
  margin-bottom: 24px;
}

.media-section,
.project-description,
.demo-section,
.team-grid {
  margin: 0 auto;
  max-width: 1180px;
  padding: clamp(54px, 8vw, 92px) clamp(20px, 5vw, 48px);
}

.section-heading {
  margin-bottom: 28px;
}

.project-description {
  padding-top: 0;
}

.description-content {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.description-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 42px rgba(11, 46, 51, 0.08);
  padding: clamp(22px, 4vw, 34px);
}

.description-block.wide {
  grid-column: 1 / -1;
}

.description-block h3 {
  color: var(--deep);
  font-size: 1.18rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.description-block p:last-child,
.feature-list {
  margin-bottom: 0;
}

.feature-list {
  display: grid;
  gap: 9px;
  padding-left: 1.2rem;
}

.feature-list li::marker {
  color: var(--teal);
}

.closing-note {
  background: var(--deep);
  color: var(--white);
}

.closing-note h3 {
  color: var(--ice);
}

.closing-note .hashtags {
  color: var(--ice);
  font-size: 0.92rem;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.image-grid,
.team-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.image-card {
  margin: 0;
  padding: 14px;
}

.mock-photo {
  aspect-ratio: 16 / 10;
  border-radius: 6px;
  position: relative;
}

.energy-flow {
  background:
    radial-gradient(circle at 20% 20%, #ffffff 0 9%, transparent 10%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0 20%, transparent 20% 42%, rgba(255, 255, 255, 0.14) 42% 48%, transparent 48%),
    linear-gradient(135deg, var(--ice), var(--teal));
}

.prototype-detail {
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.22) 0 3px, transparent 3px 38px),
    linear-gradient(150deg, var(--mist), var(--deep));
}

.demo-section {
  align-items: center;
  display: grid;
  gap: 36px;
  grid-template-columns: 0.76fr 1.24fr;
  padding-top: 0;
}

.demo-section p {
  max-width: 540px;
}

.video-placeholder {
  align-items: center;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(11, 46, 51, 0.85), rgba(79, 124, 130, 0.76)),
    linear-gradient(90deg, var(--deep), var(--teal));
  border-radius: 8px;
  box-shadow: var(--shadow);
  color: var(--white);
  display: grid;
  justify-items: center;
  padding: 24px;
}

.play-button {
  align-items: center;
  background: var(--ice);
  border: 3px solid var(--white);
  border-radius: 50%;
  cursor: pointer;
  display: inline-flex;
  height: 78px;
  justify-content: center;
  width: 78px;
}

.play-button span {
  border-bottom: 15px solid transparent;
  border-left: 22px solid var(--deep);
  border-top: 15px solid transparent;
  display: block;
  margin-left: 5px;
}

.play-button:focus-visible {
  outline: 4px solid var(--ice);
  outline-offset: 5px;
}

.video-placeholder p {
  font-weight: 900;
  margin: 16px 0 0;
}

.team-grid {
  padding-top: 24px;
}

.team-card {
  padding: 18px;
}

.avatar {
  aspect-ratio: 1;
  border-radius: 6px;
  display: block;
  margin-bottom: 18px;
  object-fit: cover;
  object-position: center;
  width: 100%;
}

.avatar-one {
  background: linear-gradient(135deg, var(--ice), var(--teal));
}

.avatar-two {
  background: linear-gradient(135deg, var(--mist), var(--deep));
}

.avatar-three {
  background: linear-gradient(135deg, var(--teal), var(--ice));
}

.avatar-four {
  background: linear-gradient(135deg, var(--deep), var(--mist));
}

.team-card h2 {
  font-size: 1.45rem;
  margin-bottom: 6px;
}

.team-card p {
  color: var(--teal);
  font-weight: 700;
  min-height: 48px;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.social-links a {
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 900;
  padding: 8px 10px;
  text-decoration: none;
}

.social-links a:hover,
.social-links a:focus-visible {
  background: var(--deep);
  color: var(--white);
  outline: none;
}

.site-footer {
  align-items: center;
  background: var(--deep);
  color: var(--white);
  display: flex;
  justify-content: space-between;
  padding: 24px clamp(20px, 5vw, 72px);
}

.site-footer p {
  font-weight: 900;
  margin: 0;
}

.site-footer a {
  color: var(--ice);
  font-weight: 900;
}

@media (max-width: 860px) {
  .hero,
  .video-hero,
  .demo-section {
    grid-template-columns: 1fr;
  }

  .video-hero {
    padding-top: 32px;
  }

  .video-hero-copy {
    text-align: center;
  }

  .video-hero-copy h1,
  .video-hero-copy .mission {
    margin-left: auto;
    margin-right: auto;
  }

  .video-hero-copy .hero-actions {
    justify-content: center;
  }

  .project-story {
    grid-template-columns: 1fr;
  }

  .project-story article {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .site-nav {
    width: 100%;
  }

  .site-nav a {
    text-align: center;
    width: 50%;
  }

  h1 {
    font-size: clamp(3.3rem, 18vw, 5.5rem);
  }

  .image-grid,
  .description-content,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .solar-array {
    min-height: 250px;
  }
}