:root {
  --sos-ink: #14212b;
  --sos-muted: #5b6b78;
  --sos-accent: #0f6e56;
  --sos-accent-soft: #d7f3ea;
  --sos-surface: #f4f7f5;
  --sos-panel: #ffffff;
  --sos-line: #d5e0da;
  --sos-glow: rgba(15, 110, 86, 0.18);
  --sos-font: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sos-sans: "DM Sans", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body.sos-home {
  color: var(--sos-ink);
  font-family: var(--sos-sans);
  background:
    radial-gradient(circle at 12% 18%, var(--sos-glow), transparent 34%),
    radial-gradient(circle at 88% 8%, rgba(20, 33, 43, 0.08), transparent 28%),
    linear-gradient(160deg, #eef5f1 0%, var(--sos-surface) 45%, #e7eee9 100%);
}

.sos-shell {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3.5rem;
}

.sos-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 3.5rem;
}

.sos-brand__name {
  font-family: var(--sos-font);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.sos-brand__powered {
  color: var(--sos-muted);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sos-hero {
  max-width: 38rem;
  animation: sos-rise 700ms ease both;
}

.sos-hero h1 {
  margin: 0 0 1rem;
  font-family: var(--sos-font);
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.sos-hero p {
  margin: 0 0 1.75rem;
  color: var(--sos-muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

.sos-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.sos-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1.15rem;
  border-radius: 0.55rem;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.sos-btn:hover {
  transform: translateY(-1px);
}

.sos-btn--primary {
  background: var(--sos-accent);
  color: #fff;
}

.sos-btn--primary:hover {
  background: #0c5a46;
}

.sos-btn--ghost {
  background: var(--sos-panel);
  border-color: var(--sos-line);
  color: var(--sos-ink);
}

.sos-panel {
  margin-top: 3rem;
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--sos-line);
  border-radius: 0.85rem;
  background: color-mix(in srgb, var(--sos-panel) 88%, transparent);
  backdrop-filter: blur(6px);
  max-width: 28rem;
  animation: sos-rise 900ms ease both;
}

.sos-panel strong {
  display: block;
  margin-bottom: 0.35rem;
}

.sos-panel span {
  color: var(--sos-muted);
  font-size: 0.95rem;
}

@keyframes sos-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .sos-shell {
    padding-top: 1.5rem;
  }

  .sos-brand {
    margin-bottom: 2.25rem;
  }
}