:root {
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;
  background-color: #ffffff;
  color: #213547;
}

body {
  margin: 0;
  padding: 0;
  min-width: 320px;
  min-height: 100vh;
  background-color: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

.card {
  padding: 2em;
}

#app {
  width: 100%;
  margin: 0;
  padding: 0;
  text-align: center;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: #ffffff;
  z-index: 1000;
  padding: 10px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  width: 100%;
}

.header h1 {
  text-align: center;
  margin: 10px 0;
  color: #000000;
  font-size: 24px;
  font-weight: bold;
}

.page-main {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  background-color: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: #ffffff;
  }
  button {
    background-color: #f9f9f9;
  }
}