.top-page {
    height: calc(100vh - 88px);
	background-image: url(https://forum2025.net/wp-content/uploads/2025/05/K25-Japan.png);
/*     background-size: cover;
    background-position: center;
    background-repeat: no-repeat; */

  display: flex;
  flex-direction: column;
  justify-content: center; /* 縦中央 */
  align-items: center;     /* 横中央 */
  text-align: center;
  background-image: url("https://forum2025.net/wp-content/uploads/2025/05/K25-Japan.png");
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  position: relative;
  padding: 0 20px;


}

.top-bg {
    width: 100%;
    height: calc(100vh - 88px);
    object-fit:cover;
    position: absolute;
    z-index: -100;
    transition: all .2s;
}

.top-catch {
/*     padding-top: 150px; */
    text-align: center;
    font-size: 56px;
    color: var(--primary-text-color);
/*     margin-top: 88px; */
    transition: all .2s;
    font-family: "Noto Sans JP", sans-serif;
}

.main-title {
    margin-top: 0;
    font-size: 4rem;
    color: var(--primary-text-color);
    text-align: center;
    transition: all .2s;
    font-family: "Lato", sans-serif;
    letter-spacing: -1px;
}

.reg-btn-sp {
    display: none;
    width: 100%;
    height: 80px;
    position: fixed;
    bottom: 0;
    z-index: 1000;
}

.online-sp {
    width: 50%;
    background-color: var(--secondary-color);
    font-size: 22px;
    border: none;
    color: var(--primary-text-color);
    transition: all .3s;
    cursor: pointer;
}

.online-sp:hover {
    background-color:var(--primary-text-color);
    color: var(--secondary-color);
}

.onsite-sp {
    width: 50%;
    background-color: var(--main-color);
    font-size: 22px;
    border: none;
    color: var(--primary-text-color);
    transition: all .3s;
    cursor: pointer;
}

.onsite-sp:hover {
    background-color:var(--primary-text-color);
    color:  var(--main-color);
}

.pre-reg {
    width: 80px;
    height: 220px;
    background-color: var(--secondary-color);
    box-shadow: 0 4px 4px rgba(0, 0, 0, 0.25); 
    position: fixed;
    top: 250px;
	left:0;
    flex-direction: column; 
    cursor: pointer;       
    z-index: 10; 
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: all .2s;
}

.pre-reg:hover {
    animation: color-change 1s ease-in-out infinite;
}

.logo {
    display: none;
}

@keyframes color-change {
    0% { background-color: var(--secondary-color) }
    50% { background-color: var(--main-color); }
    100% { background-color: var(--secondary-color); }
}

.pre-reg h6 {
    font-size: 2rem;
    color: #ffffff;
    font-family: "Inter", sans-serif;
    writing-mode: vertical-rl; /* makes text vertical */
    letter-spacing: 10px;
    font-weight: 400;
}

.pre-not {
    text-align: center;
    color: var(--primary-text-color);
    width: fit-content;
    margin: 0 auto;
    font-family: "Lato", sans-serif;
    transition: all .2s;
}

.pre-not h2 {
    font-size: 5rem;
    transition: all .2s;
}

.pre-not h2 span {
    font-size: 3rem;
    transition: all .2s;
}

.pre-not p {
    padding-bottom: 10px;
    font-size: 1.5rem;
    text-align: left;
    transition: all .2s;
    font-weight: bolder;
}

.logo {
    text-align: center;
    opacity: 0;
    transition: all .3s;
}

.logo-title {
    font-size: 60px;
    font-weight: bolder;
    color: var(--primary-text-color);
    font-family: "Lato", sans-serif;
}

.logo-under {
    font-size: 18px;
    font-family: "Lato", sans-serif;
    color: var(--primary-text-color);
}

.line-break {
    white-space: nowrap; /* default: keep it on one line */
}
  
@media (max-width: 1440px) {
    .line-break {
      display: block; /* forces it onto the next line */
    }
    .top-catch {
/*         padding-top: 80px; */
    }
}

@media (max-width: 1200px) {
    .main-title {
        font-size: 4rem;
    }
}


/* =============/ reponsive as following the device / ============*/
@media (max-height : 800px) {
    .top-catch{
        margin-top: 50px;
    }
    .main-title {
        margin-top: 0px;
    }
    .logo {
        display: none;
    }
}
@media (max-height : 725px) {
    .top-catch{
        font-size: 40px;
        margin-top: 30px;
    }
    .top-catch h1{
        font-size: 20px;
    }
    .main-title {
        font-size: 3.5rem;
        margin-top: 10px;
    }
    .pre-not h2 {
        font-size: 3rem;
        transition: all .2s;
    }
    .pre-not h2 span {
        font-size: 2rem;
        transition: all .2s;
    }
    .pre-not p {
        font-size: 15px;
    }
    .logo-title {
        font-size: 46px;
    }
    .logo-under {
        font-size: 14px;
    }


    .out-title {
        margin-top: -60px;
    }
}
@media (max-height : 720px) {
    .top-catch{
        margin-top: 5px !important;
    }
    .main-title {
        font-size: 36px !important;
        margin-top: -5px !important;
    }
    .pre-not p {
        font-size: 14px !important;
    }
}
@media(max-width : 1020px) {
    @media (max-height : 667px) {
        .top-catch{
            font-size: 18px !important;
        }
        .main-title {
            font-size: 26px !important;
            margin-top: -5px !important;
        }
        .pre-not p {
            font-size: 14px !important;
        }
        .pre-not h2 {
            font-size: 30px ;
        }
        .out-title.active {
            margin-top: -60px;
        }
    }
}

/* =============/ reponsive as following the device /============*/