:root {
  --bg-dark: #0d0818;
  --card-bg: rgba(31, 19, 52, 0.62);
  --card-border: rgba(214, 183, 255, 0.35);
  --text-main: #f7f1ff;
  --text-soft: #d8c8ef;
  --accent-a: #b56cff;
  --accent-b: #7e5bff;
  --accent-c: #d15dff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: var(--bg-dark);
}

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

.banner {
  min-height: 100vh;
  position: relative;
  padding: 1.4rem clamp(1rem, 3vw, 3rem) 3rem;
  background-image:
    linear-gradient(rgba(8, 5, 19, 0.76), rgba(13, 8, 24, 0.84)),
    url("https://images.unsplash.com/photo-1516035069371-29a1b244cc32?auto=format&fit=crop&w=1920&q=80");
  background-size: cover;
  background-position: center;
  display: flex;
  flex-direction: column;
}

.topbar {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.brand img {
  width: 2rem;
  height: 2rem;
  border-radius: 0.55rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.2vw, 2rem);
  color: var(--text-soft);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: #ffffff;
}

.banner-content {
  width: min(1120px, 100%);
  margin: auto auto;
  display: grid;
  gap: 1rem;
}

.eyebrow {
  margin: 0;
  color: #e9d7ff;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.86rem;
}

.banner h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.08;
  max-width: 12ch;
}

.lead {
  margin: 0;
  color: var(--text-soft);
  max-width: 58ch;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  line-height: 1.75;
}

main {
  background:
    radial-gradient(circle at 12% 10%, rgba(181, 108, 255, 0.16), transparent 42%),
    radial-gradient(circle at 80% 0%, rgba(126, 91, 255, 0.2), transparent 36%),
    linear-gradient(160deg, #110a20 0%, #1a1030 52%, #0f081e 100%);
}

.about {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 3vw, 2rem) 1.4rem;
}

.about-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1.3rem;
  padding: clamp(1.2rem, 3.2vw, 2rem);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 1.3rem;
}

.about-logo {
  width: clamp(3.2rem, 5vw, 4.4rem);
  height: clamp(3.2rem, 5vw, 4.4rem);
  border-radius: 1rem;
  flex-shrink: 0;
}

.about h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
}

.about p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.75;
}

.intro {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: clamp(1.4rem, 3vw, 2rem) clamp(1rem, 3vw, 2rem) clamp(3rem, 6vw, 5rem);
  display: grid;
  gap: clamp(1.2rem, 2.8vw, 2rem);
}

.intro-item {
  background: linear-gradient(145deg, rgba(66, 39, 108, 0.55), rgba(27, 16, 48, 0.72));
  border: 1px solid rgba(201, 161, 255, 0.25);
  border-radius: 1.2rem;
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 1rem;
  padding: clamp(1rem, 2.4vw, 1.5rem);
  align-items: center;
}

.item-b,
.item-d {
  grid-template-columns: 220px 1fr;
}

.item-a {
  transform: translateX(-0.9rem);
}

.item-b {
  transform: translateX(0.7rem);
}

.item-c {
  transform: translateX(-0.5rem);
}

.item-d {
  transform: translateX(0.85rem);
}

.intro-item img {
  width: 100%;
  max-width: 220px;
  aspect-ratio: 9 / 20;
  object-fit: cover;
  border-radius: 0.95rem;
  justify-self: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.intro-icon {
  margin: 0;
  font-size: 1.4rem;
}

.intro-item h3 {
  margin: 0.2rem 0 0.65rem;
  font-size: clamp(1.2rem, 2vw, 1.6rem);
}

.intro-item p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.7;
}

.footer {
  padding: 1.4rem 1rem 2rem;
  text-align: center;
  background: linear-gradient(100deg, #6e39c7, #8244dd, #ad5eff);
  color: #fdf8ff;
}

.footer p {
  margin: 0.35rem 0;
  font-size: 0.92rem;
}

.footer a {
  text-decoration: underline;
}

@media (max-width: 860px) {
  .intro-item,
  .item-b,
  .item-d {
    grid-template-columns: 1fr;
  }

  .item-a,
  .item-b,
  .item-c,
  .item-d {
    transform: none;
  }

  .intro-item img {
    max-width: min(240px, 65vw);
  }

  .topbar {
    flex-wrap: wrap;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .banner {
    padding-top: 1rem;
  }

  .lead {
    line-height: 1.65;
  }

  .about-card {
    flex-direction: column;
    align-items: flex-start;
  }
}