* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

body {
  background: #0c0c0cfa;
  color: #e52b0a;
  overflow-y: auto;
}

.app {
  max-width: 390px;
  margin: auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  padding: 10px 8px;
}

.topbar h1 {
  font-size: 20px;
  margin-bottom: 10px;
}

.top-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.nav-btn {
  flex: 1;
  padding: 10px;
  border-radius: 12px;
  border: none;
  background: rgba(253, 252, 252, 0.406);
  color: #f50404;
  font-size: 13px;
  font-weight: bold;
  box-shadow: 0 3px 8px rgb(236, 10, 10);
  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.nav-icon {
  width: 16px;
  height: 16px;
  object-fit: contain;
}

.page {
  display: none;
  padding: 8px;
  flex: 1;
}

.page.active {
  display: block;
}

.card,
.result-card {
  background: rgba(244, 244, 244, 0.281);
  border-radius: 18px;
  padding: 12px;
  margin-bottom: 10px;
  box-shadow: 0 4px 16px rgb(237, 9, 9);
}

input,
select,
button {
  width: 100%;
  padding: 10px;
  margin: 5px 0;
  border-radius: 12px;
  border: none;
  font-size: 14px;
}

input,
select {
  background: #0e0e0e;
  color: #ed0808;
}

button {
  background: #0e26da;
  color: rgb(249, 246, 246);
  font-weight: bold;
  cursor: pointer;
}

.dark {
  background: #121212;
  color: white;
}

.dark .card,
.dark .result-card,
.dark .nav-btn {
  background: #1f1f1f;
  color: rgb(247, 7, 7);
}

.large-text {
  font-size: 20px;
}