#welcome {
  min-height: 100vh;
  box-shadow: #ddd 0px 0px 10px 5px;
  background: rgb(252, 252, 252);
}
#title-box {
  text-align: center;
  animation: fade-in 0.5s ease-out 0.3s both,
          going-down 0.5s ease-out 0.3s both;
}
#title-box > div {
  margin: 10px 0 auto;
}
#title-box > div:first-child {
  margin-top: 0px;
}
#title-box > div:last-child {
  margin-bottom: 20px;
}
.title, h1 {
  line-height: 48px;
  line-height: 3rem;
  font-size: 40px;
  font-size: 2.5rem;
  font-weight: bolder;
  letter-spacing: -3.2px;
  letter-spacing: -0.2rem;
}
.sec-tit {
  line-height: 35.2px;
  line-height: 2.2rem;
  font-size: 24px;
  font-size: 1.5rem;
  font-weight: lighter;
  letter-spacing: 6.4px;
  letter-spacing: 0.4rem;
}
.time-logo {
  display: inline-block;
  margin: 0 auto;
  margin-top: 20px;
  width: 30px;
  height: 30px;
  background-image: url('../img/clock.png');
  background-size: cover;
  /*
  자료 출처
  https://commons.wikimedia.org/wiki/File:Alarms_%26_Clock_icon.png
  */
}
.time-logo + div {
  font-weight: lighter;
  letter-spacing: -0.5px;
}
hr {
  margin: 20px 0;
  border: 1.5px dashed #222;
}
.w-line {
  animation: fade-in 0.4s ease-out 0.9s both,
          going-down 0.4s ease-out 0.9s both;
}
#welcome > p:first-of-type {
  padding: 0 5%;
  line-height: 19.2px;
  line-height: 1.5rem;
  text-align: center;
  font-size: 13.6px;
  font-size: 0.85rem;
  font-weight: 400;
}
#p-tit {
  display: block;
  font-size: 24px;
  font-size: 1.5rem;
  font-weight: bolder;
}
#name-input {
  box-sizing: border-box;
  margin: 20px 25% 10px 25%;
  width: 50%;
}
#name-input > input {
  width: 100%;
  height: 40px;
  border: 1px #ddd solid;
  border-radius: 20px;
  font-weight: lighter;
  font-size: 19.2px;
  font-size: 1.2rem;
  text-align: center;
  opacity: 0;
  animation: fade-in 0.4s ease-out 1.4s both,
          going-down 0.4s ease-out 1.4s both;
}
.check-name {
  display: inline-block;
  margin: 10px 10%;
  width: 80%;
  text-align: center;
}
.warning {
  color: rgb(231, 20, 20, 0.8);
  font-weight: bold;
}
.start-wrap {
  margin: 0 20% 20px 20%;
  width: 60%;
}
.start {
  box-sizing: border-box;
  width: 100%;
  height: 60px;
  line-height: 60px;
  border-radius: 50px;
  text-align: center;
  background-color: rgba(0, 135, 245, 0.9);
  color: #fff;
  font-weight: 600;
  font-size: 32px;
  font-size: 2rem;
  animation: fade-in 0.5s ease-out 1.9s both,
          going-down 0.5s ease-out 1.9s both,
          start-flicker 2.5s infinite;
  cursor: pointer;
}
.start:hover, .start:focus {
  animation-play-state: paused;
}
.start:active {
  animation-play-state: running;
}

@media all and (min-width: 486px) {
  .title {
    line-height: 64px;
    line-height: 4rem;
    font-size: 51.2px;
    font-size: 3.2rem;
  }
  .sec-tit {
    line-height: 52.8px;
    line-height: 3.3rem;
    font-size: 32px;
    font-size: 2rem;
  }
  #welcome > p:first-of-type {
    padding: 0 12.5%;
    line-height: 22.4px;
    line-height: 1.4rem;
    font-size: 16px;
    font-size: 1rem;
  }
  #p-tit {
    font-size: 28.8px;
    font-size: 1.8rem;
  }
}

@media all and (min-width: 768px) {
  #title-box > div {
    margin: 30px 0 auto;
  }
  #title-box > div:last-child {
    margin: 20px 0 auto;
    margin-bottom: 30px;
  }
  .title {
    line-height: 80px;
    line-height: 5rem;
    font-size: 59.2px;
    font-size: 3.7rem;
  }
  .sec-tit {
    line-height: 64px;
    line-height: 4rem;
    font-size: 40px;
    font-size: 2.5rem;
    font-weight: lighter;
    letter-spacing: 8px;
    letter-spacing: 0.5rem;
  }
  .time-logo + div {
    font-size: 17.6px;
    font-size: 1.1rem;
    letter-spacing: -0.8px;
    letter-spacing: -0.05rem;
  }
  #welcome > p:first-of-type {
    padding: 0 15%;
  }
  #p-tit {
    font-size: 28.8px;
    font-size: 1.8rem;
  }
  #name-input {
    margin: 30px 30% 0 30%;
    width: 40%;
  }
  #name-input > input {
    height: 50px;
  }
  .check-name {
    margin: 25px 20%;
    width: 60%;
    font-size: 17.6px;
    font-size: 1.1rem;
  }
  .start-wrap {
    margin: 0px 20% 50px 20%;
    width: 60%;
  }
  .start {
    min-width: 80%;
    height: 100px;
    line-height: 100px;
    font-size: 48px;
    font-size: 3rem;
  }
}

@media all and (min-width: 1024px) {
  #title-box > div {
    margin: 60px 0 auto;
  }
  .title {
    line-height: 88px;
    line-height: 5.5rem;
    font-size: 67.2px;
    font-size: 4.2rem;
  }
  .sec-tit {
    line-height: 56px;
    line-height: 3.5rem;
    font-size: 40px;
    font-size: 2.5rem;
    font-weight: lighter;
  }
  hr {
    margin: 30px 5% 20px 5%;
    width: 90%;
  }
  .time-logo + div {
    font-size: 19.2px;
    font-size: 1.2rem;
    letter-spacing: -1.28px;
    letter-spacing: -0.08rem;
  }
  #welcome > p:first-of-type {
    padding: 0 17.5%;
    line-height: 27.2px;
    line-height: 1.7rem;
    font-size: 17.6px;
    font-size: 1.1rem;
  }
  #p-tit {
    font-size: 32px;
    font-size: 2rem;
  }
  .check-name {
    font-size: 19.2px;
    font-size: 1.2rem;
  }
}

@media all and (min-width: 1440px) {
  hr {
    margin: 35px 5% 35px 5%;
    width: 90%;
  }
}