body {
    margin: 0;
    padding: 0;
    font-family: "Noto Sans JP", sans-serif;
    width: 100%;
    overflow-x: hidden; 
}

.global-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 90px; 
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    padding-left: 4%;
    padding-right: 4%;
    box-sizing: border-box;
    z-index: 100;
}

.header-logo {
    height: 44px;
    width: auto;
    display: block;
    transition: opacity 0.3s;
}

.header-logo:hover {
    opacity: 0.7;
}

.loader-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background-color: #ffffff;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 1.0s ease;
}

.loader-inner {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loader-logo {
    width: 50%;
    max-width: 480px;
    height: auto;
    display: block;
    margin: 0 auto;
    opacity: 0;
    transition: opacity 1.0s ease;
}

.loader-logo.fade-in { opacity: 1; }
.loader-bg.hide { opacity: 0; pointer-events: none; }

.anniversary-hero {
    width: 100%;
    height: 100vh;
    height: 100dvh; 
    min-height: 560px;
    background-image: url('/files/user/20th/img/bg.png'); 
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    opacity: 0;
    transition: opacity 1.5s ease-out;
}

.anniversary-hero.visible {
    opacity: 1;
    animation: fadeInPage 1.5s ease-out forwards;
}

.hero-bg-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    transition: opacity 4.0s ease; 
    opacity: 1;
}

.hero-bg-video.is-hidden {
    opacity: 0;
}

.anniversary-content {
    width: 90%;
    max-width: 1000px;
    padding: 20px;
    position: relative;
    z-index: 1;
    opacity: 0;
    transform: translateY(30px);
}

.anniversary-hero.visible .anniversary-content {
    animation: slideUpContent 1.0s ease-out 0.5s forwards;
}

.logo-wave {
    position: relative;
    width: 100%;
    max-width: 380px; 
    margin: 0 auto 30px;
    overflow: hidden;
}

.logo-wave img {
    width: 100%;
    height: auto;
    display: block;
}

.logo-wave::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        to right, 
        rgba(255, 255, 255, 0) 0%, 
        rgba(255, 255, 255, 0.6) 50%, 
        rgba(255, 255, 255, 0) 100%
    );
    transform: skewX(-25deg);
    z-index: 1;
    animation: shineLoop 5s infinite;
}

.copy-text {
    font-size: clamp(32px, 5.5vw, 80px);
    font-weight: 900;
    font-style: italic;
    line-height: 1.3;
    margin: 0;
    letter-spacing: .05em;
    color: #2e3793;
    filter: drop-shadow(0px 0px 20px rgba(255, 255, 255, 0.9));
    white-space: nowrap;
}

.copy-text .kana {
    font-size: 0.7em; 
    vertical-align: 0.05em; 
    font-weight: 800;
}

@media (max-width: 768px) {
    .hero-bg-video {
        display: none;
    }

    .anniversary-hero {
        min-height: 100dvh;
        background-size: cover;
        background-position: right;
    }

    .loader-logo {
        width: 60%;
        max-width: 300px;
    }

    .global-header {
        height: 60px;
        padding-left: 20px;
        padding-right: 20px;
        justify-content: center;
    }
    .header-logo {
        height: 28px;
    }

    .anniversary-content {
        width: 94%;
        padding: 0;
        margin-top: -20px;
    }

    .logo-wave {
        max-width: 200px;
        margin-bottom: 24px;
    }

    .copy-text {
        font-size: 11vw; 
        line-height: 1.25;
        white-space: normal;
    }
}

@keyframes bgPanMobile {
    0% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes shineLoop {
    0% { left: -100%; }
    40% { left: 200%; }
    100% { left: 200%; }
}

@keyframes fadeInPage {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes slideUpContent {
    0% { opacity: 0; transform: translateY(30px); }
    100% { opacity: 1; transform: translateY(0); }
}