* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f0 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #333;
  -webkit-font-smoothing: antialiased;
}

#app {
  width: 100%;
  max-width: 420px;
  padding: 20px;
}

.screen {
  display: none;
  animation: fadeIn 0.3s ease;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Loading */
.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid #e0e0e0;
  border-top-color: #06C755;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  margin-top: 16px;
  color: #888;
  font-size: 14px;
}

/* Card */
.card {
  background: white;
  border-radius: 20px;
  padding: 40px 24px;
  text-align: center;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.icon-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: #f0faf3;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}

.icon-circle.success {
  background: #e8f5e9;
}

.icon-circle.error {
  background: #ffebee;
}

.card h1 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.description {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
  margin-bottom: 28px;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 16px 24px;
  background: #06C755;
  color: white;
  font-size: 16px;
  font-weight: 700;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover {
  background: #05b34c;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 14px 24px;
  background: white;
  color: #333;
  font-size: 15px;
  font-weight: 600;
  border: 2px solid #ddd;
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.btn-secondary:hover {
  border-color: #999;
}

.note {
  margin-top: 16px;
  font-size: 12px;
  color: #999;
}