* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #e0f3ff, #ffffff);
  color: #333;
}

.app-shell {
  min-height: calc(100vh - 48px);
  padding-bottom: 88px;
}

.site-header {
  padding: 16px;
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid #cfe4ff;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo img {
  display: block;
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 14px;
}

.header-text h1 {
  margin: 0 0 4px;
  font-size: 1.4rem;
  line-height: 1.35;
}

.header-text .lead {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.container {
  max-width: 600px;
  margin: 16px auto;
  padding: 0 12px 24px;
}

.card {
  background: #ffffff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 4px 12px rgba(0, 80, 160, 0.08);
  margin-bottom: 12px;
}

.label {
  font-size: 0.85rem;
  color: #0070c9;
  margin: 0 0 10px;
  font-weight: 700;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 12px;
  margin-bottom: 14px;
}

.action-btn {
  padding: 14px;
  border: none;
  border-radius: 12px;
  font-weight: 700;
  font-size: 14px;
  background: #dbeafe;
  color: #1d4ed8;
  cursor: pointer;
  transition: 0.2s;
}

.action-btn:hover {
  background: #bfdbfe;
}

.action-btn:active {
  transform: scale(0.96);
}

.action-btn.is-active {
  background: #2563eb;
  color: #fff;
}

.action-result {
  margin-top: 14px;
  padding: 12px;
  border-radius: 10px;
  background: #f0f9ff;
  border: 1px solid #cfe4ff;
  font-size: 14px;
  line-height: 1.7;
  min-height: 120px;
}

.advice-list {
  padding-left: 1.2rem;
  margin: 4px 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
}

.advice-list li {
  margin-bottom: 6px;
}

.note {
  margin-top: 16px;
  padding: 12px;
  background: #f2f8ff;
  border-radius: 10px;
  font-size: 0.85rem;
  line-height: 1.7;
  border: 1px solid #d9ecff;
}

.note h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: space-around;
  gap: 8px;
  padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.95);
  border-top: 1px solid #dbeafe;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
}

.nav-item {
  flex: 1;
  text-decoration: none;
  color: #64748b;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 6px;
  border-radius: 12px;
  transition: 0.2s;
  min-height: 56px;
}

.nav-item.active {
  background: #e0f2fe;
  color: #0369a1;
  font-weight: 700;
}

.nav-icon {
  font-size: 1.2rem;
  line-height: 1;
}

.nav-text {
  font-size: 0.75rem;
  line-height: 1.2;
}

.site-footer {
  text-align: center;
  font-size: 0.75rem;
  padding: 8px 0 16px;
  color: #666;
}

@media (max-width: 480px) {
  .header-inner {
    align-items: center;
    padding: 0 4px;
  }

  .site-logo img {
    width: 52px;
    height: 52px;
  }

  .header-text h1 {
    font-size: 1.2rem;
  }

  .header-text .lead {
    font-size: 0.85rem;
  }

  .action-grid {
    grid-template-columns: 1fr;
  }

  .action-btn {
    font-size: 14px;
    padding: 13px;
  }

  .action-result {
    min-height: 140px;
  }

  .nav-text {
    font-size: 0.72rem;
  }
}