body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  font-family: "Quicksand", "Noto Sans SC", sans-serif;
  background-color: #f0f2f5;
  color: #2c3e50;
  overflow: hidden;
}

body,
html {
  margin: 0;
  padding: 0;
}

.tips {
  background: rgba(255, 255, 255, 0.9);
  padding: 3rem 4rem;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  text-align: center;
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease;
  max-width: 90%;
}

.tips:hover {
  transform: translateY(-5px);
}

h1 {
  font-size: 3.5em;
  margin: 0 0 0.5rem 0;
  color: #2c3e50;
}

h2 {
  font-size: 1.8em;
  margin: 0 0 1.5rem 0;
  color: #5d6d7e;
  font-weight: 600;
}

p {
  font-size: 1.2em;
  color: #7f8c8d;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: white;
  background-color: #078a76;
  font-size: 1.2em;
  font-weight: bold;
  padding: 12px 35px;
  border-radius: 50px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(7, 138, 118, 0.3);
  display: inline-block;
}

a:hover {
  background-color: #066e5e;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(7, 138, 118, 0.4);
}

#timer {
  font-size: 2em;
  font-weight: bold;
}

.about,
.background {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  position: fixed;
  color: rgba(181, 202, 160, 0.2);
  z-index: -1;
  user-select: none;
  font-weight: bold;
}

.background {
  bottom: -2vh;
  left: -2vw;
  font-size: 15vh;
  font-family: "Arial Black", sans-serif;
}

.about {
  top: 2vh;
  right: 2vw;
  font-size: 2vh;
}