:root {
  --activation-primary: var(--brand-primary, #4f46e5);
  --activation-bg: #f5f7fb;
  --activation-text: #172033;
  --activation-muted: #667085;
  --activation-border: #e4e7ec;
}

* { box-sizing: border-box; }

body.activation-page {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
  color: var(--activation-text);
  background:
    radial-gradient(circle at 10% 10%, rgba(79, 70, 229, .12), transparent 32rem),
    radial-gradient(circle at 90% 80%, rgba(14, 165, 233, .10), transparent 28rem),
    var(--activation-bg);
}

.activation-header {
  min-height: 68px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,.88);
  border-bottom: 1px solid rgba(228,231,236,.85);
  backdrop-filter: blur(12px);
}

.activation-brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-weight: 700;
  color: var(--activation-text);
}

.activation-brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  color: #fff;
  background: var(--activation-primary);
  display: grid;
  place-items: center;
}

.activation-shell {
  width: min(860px, calc(100% - 2rem));
  margin: 3.5rem auto;
}

.activation-intro {
  text-align: center;
  margin-bottom: 2rem;
}

.activation-intro h1 {
  font-weight: 750;
  letter-spacing: -.025em;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.activation-intro p {
  color: var(--activation-muted);
  max-width: 650px;
  margin: .75rem auto 0;
}

.activation-card {
  background: #fff;
  border: 1px solid var(--activation-border);
  border-radius: 20px;
  box-shadow: 0 24px 70px rgba(16, 24, 40, .10);
  overflow: hidden;
}

.activation-card-head {
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--activation-border);
  display: flex;
  align-items: center;
  gap: .9rem;
}

.activation-step-number {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--activation-primary);
  font-weight: 700;
}

.activation-card-body { padding: 1.75rem; }

.activation-key-input {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 600;
}

.activation-summary {
  background: #f8f9ff;
  border: 1px solid #e0e3ff;
  border-radius: 14px;
  padding: 1rem 1.15rem;
}

.activation-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem 1.25rem;
}

.activation-summary .label {
  display: block;
  color: var(--activation-muted);
  font-size: .72rem;
}

.activation-summary .value {
  font-weight: 600;
  overflow-wrap: anywhere;
}

.activation-alert {
  display: none;
  border-radius: 12px;
  padding: .9rem 1rem;
  margin-bottom: 1.25rem;
}

.activation-alert.error {
  display: block;
  background: #fff1f2;
  border: 1px solid #fecdd3;
  color: #9f1239;
}

.activation-alert.info {
  display: block;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e40af;
}

.activation-result {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.activation-result-icon {
  width: 74px;
  height: 74px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: #16a34a;
  font-size: 2rem;
  box-shadow: 0 12px 30px rgba(22, 163, 74, .25);
}

.activation-hidden { display: none !important; }

@media (max-width: 700px) {
  .activation-shell { margin: 2rem auto; }
  .activation-header { padding: 0 1rem; }
  .activation-card-body { padding: 1.25rem; }
  .activation-summary-grid { grid-template-columns: 1fr 1fr; }
}