:root {
  --brand-primary: #4c5fe9;
  --brand-primary-hover: #3d4dd0;
  --brand-coral: #f07f64;
  --brand-mint: #18a37b;
  --ink: #182235;
  --muted: #6f7b90;
  --canvas: #f4f6fa;
  --surface: #ffffff;
  --line: #e3e8f1;
  --soft-blue: #eef1ff;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 50% 36%, rgba(76, 95, 233, 0.1), transparent 24rem),
    linear-gradient(var(--canvas), var(--canvas));
}

.landing-shell {
  display: grid;
  min-height: calc(100vh - 4.5rem);
  min-height: calc(100dvh - 4.5rem);
  padding: 2rem;
  place-items: center;
}

.hero {
  position: relative;
  width: min(100%, 40rem);
  padding: clamp(2.8rem, 8vw, 5.5rem) clamp(1.5rem, 7vw, 4.5rem);
  overflow: hidden;
  text-align: center;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: 1.25rem 1.25rem 1.25rem 0.35rem;
  box-shadow: 0 1.5rem 4.5rem rgba(24, 34, 53, 0.08);
}

.hero::before,
.hero::after {
  position: absolute;
  width: 0.6rem;
  height: 0.6rem;
  content: "";
  background: var(--brand-coral);
  border-radius: 50%;
}

.hero::before { top: 1.5rem; right: 1.5rem; }
.hero::after { bottom: 1.5rem; left: 1.5rem; background: var(--brand-mint); }

.hero-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 21rem;
  height: 21rem;
  border: 1px solid rgba(76, 95, 233, 0.12);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.brand-mark {
  position: relative;
  z-index: 1;
  display: inline-grid;
  width: 4rem;
  height: 4rem;
  margin-bottom: 1.5rem;
  color: #fff;
  font-family: "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.12em;
  line-height: 1;
  place-items: center;
  background: var(--brand-primary);
  border-radius: 0.85rem 0.85rem 0.85rem 0.2rem;
  box-shadow: 0 0.75rem 1.5rem rgba(76, 95, 233, 0.24);
}

.eyebrow {
  position: relative;
  z-index: 1;
  margin: 0 0 0.55rem;
  color: var(--brand-primary);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brand-name {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.45rem, 8vw, 4.4rem);
  font-weight: 800;
  letter-spacing: -0.07em;
  line-height: 0.95;
}

.brand-name span { color: var(--brand-primary); }

.tagline {
  position: relative;
  z-index: 1;
  max-width: 20rem;
  margin: 1.15rem auto 1.8rem;
  color: var(--muted);
  font-size: clamp(0.95rem, 2.5vw, 1.1rem);
  line-height: 1.7;
}

.trust-line {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 650;
}

.trust-line span { padding: 0 0.75rem; }
.trust-line span + span { border-left: 1px solid var(--line); }

.footer {
  height: 4.5rem;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.75rem;
  text-align: center;
}

:focus-visible { outline: 3px solid rgba(76, 95, 233, 0.28); outline-offset: 3px; }

@media (max-width: 480px) {
  .landing-shell { padding: 1rem; }
  .hero { padding: 3rem 1.25rem; }
  .hero::before { top: 1rem; right: 1rem; }
  .hero::after { bottom: 1rem; left: 1rem; }
  .trust-line span { padding: 0 0.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}