:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-panel: rgba(8, 20, 40, 0.86);
  --bg-panel-strong: rgba(10, 30, 58, 0.96);
  --line: rgba(101, 243, 255, 0.2);
  --line-strong: rgba(101, 243, 255, 0.38);
  --text: #eef6ff;
  --text-soft: rgba(226, 239, 255, 0.78);
  --accent: #65f3ff;
  --accent-strong: #2ab7ff;
  --shadow: 0 32px 80px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Sora", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(42, 183, 255, 0.18), transparent 32%),
    radial-gradient(circle at top right, rgba(101, 243, 255, 0.14), transparent 28%),
    linear-gradient(180deg, #030914 0%, #07111f 54%, #081425 100%);
  color: var(--text);
}

.install-shell {
  width: 100%;
  min-height: 100vh;
  padding: 32px 18px 48px;
}

.hero-card {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background:
    linear-gradient(180deg, rgba(10, 24, 49, 0.95), rgba(7, 17, 31, 0.92)),
    radial-gradient(circle at top right, rgba(42, 183, 255, 0.16), transparent 30%);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.brand-row {
  display: flex;
  gap: 18px;
  align-items: center;
}

.brand-mark {
  width: 76px;
  height: 76px;
  flex: 0 0 auto;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.summary {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--text-soft);
  font-size: 1.02rem;
  line-height: 1.7;
}

.step-row,
.surface-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.step-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.surface-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.step-card,
.surface-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 20px;
  background: var(--bg-panel);
}

.step-index {
  display: inline-flex;
  width: 30px;
  height: 30px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(101, 243, 255, 0.14);
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 14px;
}

.step-card strong,
.surface-card h2 {
  display: block;
  margin: 0 0 10px;
}

.step-card p,
.body-copy,
.helper-copy,
.detail-list {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.65;
}

.section-label {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  font-weight: 700;
}

.button-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  cursor: pointer;
  font-weight: 700;
  border: 1px solid transparent;
}

.primary-button {
  color: #02111f;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 18px 40px rgba(42, 183, 255, 0.28);
}

.secondary-button {
  color: var(--text);
  background: rgba(18, 35, 63, 0.92);
  border-color: var(--line-strong);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.primary-button.is-disabled,
.secondary-button.is-disabled {
  opacity: 0.48;
  pointer-events: none;
  box-shadow: none;
}

.activation-code {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line-strong);
  background: var(--bg-panel-strong);
  font-family: "SFMono-Regular", "Roboto Mono", monospace;
  font-size: 1rem;
  letter-spacing: 0.04em;
  overflow-wrap: anywhere;
}

.detail-card {
  margin-top: 18px;
}

.detail-list {
  padding-left: 18px;
}

.detail-list li + li {
  margin-top: 10px;
}

@media (max-width: 900px) {
  .step-row,
  .surface-grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    padding: 22px;
  }

  .brand-row {
    align-items: flex-start;
  }
}