:root {
  --bg: #111111;
  --yellow: #f2c343;
  --gray: #4e4e4e;
  --text: rgba(255, 255, 255, 0.92);
  --muted: #4e4e4e;
  --line: rgba(255, 255, 255, 0.55);
  --lineStrong: rgba(255, 255, 255, 0.8);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    "Funnel Display",
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background image + subtle vignette/texture feeling (via layered gradients). */
.hero {
  min-height: 100svh;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;

  background-image:
    radial-gradient(1200px 800px at 50% 50%, rgba(17, 17, 17, 0.35), rgba(17, 17, 17, 0.78) 70%, rgba(17, 17, 17, 0.92) 100%),
    radial-gradient(900px 900px at 12% 40%, rgba(255, 255, 255, 0.06), rgba(17, 17, 17, 0) 55%),
    radial-gradient(900px 900px at 88% 65%, rgba(255, 255, 255, 0.05), rgba(17, 17, 17, 0) 55%),
    url("/assets/SparketAI_BG.jpg");
  background-size: cover;
  background-position: center;
}

.topbar {
  position: fixed;
  top: clamp(18px, 3vw, 34px);
  right: clamp(18px, 3vw, 40px);
  z-index: 5;
}

.topbar__link {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.topbar__link:hover,
.topbar__link:focus-visible {
  color: var(--yellow);
  text-decoration: underline;
  text-underline-offset: 6px;
}

.hero__center {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
  text-align: center;
  padding: 40px 18px 80px;
}

/* The source PNG has a white background; multiply blending makes it disappear on dark bg. */
.hero__mark {
  width: min(240px, 54vw);
  height: auto;
  opacity: 0.95;
  mix-blend-mode: multiply;
  filter: drop-shadow(0 18px 60px rgba(17, 17, 17, 0.65));
}

.hero__title {
  margin: 0;
  width: min(600px, 90vw);
  height: auto;
  filter: drop-shadow(0 18px 70px rgba(17, 17, 17, 0.75));
}

.hero__description {
  max-width: min(800px, 85vw);
  margin: 0;
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.02em;
  text-align: center;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 28px;
  min-width: min(300px, 78vw);

  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(17, 17, 17, 0.2);
  backdrop-filter: blur(2px);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  font-size: 12px;
}

.hero__cta:hover,
.hero__cta:focus-visible {
  border-color: var(--yellow);
  background: rgba(242, 195, 67, 0.1);
  color: var(--yellow);
}

.hero__footer {
  position: absolute;
  bottom: clamp(22px, 4vw, 44px);
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  pointer-events: none;
}

.hero__handle {
  pointer-events: auto;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gray);
  text-transform: uppercase;
}

@media (max-width: 520px) {
  .hero__center {
    gap: 40px;
  }

  .hero__cta {
    letter-spacing: 0.28em;
  }
}

/* About Us Section */
.about {
  min-height: 100vh;
  background: var(--bg);
  padding: clamp(100px, 12vw, 160px) clamp(24px, 5vw, 80px) clamp(60px, 8vw, 100px);
}

.about__container {
  max-width: 900px;
  margin: 0 auto;
}

.about__title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  margin: 0 0 clamp(60px, 8vw, 80px);
  text-align: center;
}

.about__member {
  margin-bottom: clamp(48px, 6vw, 64px);
}

.about__member:last-child {
  margin-bottom: 0;
}

.about__member-name {
  font-size: clamp(20px, 3vw, 24px);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--yellow);
  margin: 0 0 20px;
  text-transform: uppercase;
}

.about__member-bio {
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  letter-spacing: 0.02em;
}

@media (max-width: 520px) {
  .about {
    padding: clamp(80px, 10vw, 120px) 20px clamp(40px, 6vw, 60px);
  }

  .about__member {
    margin-bottom: 40px;
  }

  .about__member-bio {
    line-height: 1.6;
  }
}