@charset "utf-8";

/* Cascading Style Sheets, css_name: index.css */
/* Copyright (C)  Kazuhide Senda. All Rights Reserved. */

body {
    margin: 5;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    }
a,a: hover,a: visited {
    color: inherit;
}
.container {
    position: relative;
    max-width: 750px;
    margin:40px auto;
    background: #4682b4;
    padding: 15px;
    border-radius: 12px;
    color: blue;
    border: 4px solid deepskyblue;
}
/* ===============================
   Logo Intro Animation
   =============================== */

body.loading {
    background-color: #778899;
}

/* ===== ロゴ初期状態（非表示） ===== */
#mainLogo {
    opacity: 0;
    transform: translateY(200px);
    transition: opacity 1.2s ease, transform 1.2s ease;
}

/* ===== 表示状態 ===== */
#mainLogo.show {
    opacity: 1;
    transform: translateY(0);
}

@keyframes logoIntro {
    0% {
        opacity: 0;
        transform: scale(0.92);
        filter: blur(6px);
    }
    60% {
        opacity: 1;
        transform: scale(1.02);
        filter: blur(0px);
    }
    100% {
        opacity: 1;
        transform: scale(1);
        filter: blur(0px);
    }
}
/* ===============================
   Close Button (Modern Glass UI)
   =============================== */
.close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 9999;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    font-size: 22px;
    color: white;

    background: rgba(0,0,0,0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);

    box-shadow: 0 4px 15px rgba(0,0,0,0.35);
    transition: all .25s ease;
}

.close-btn:hover {
    transform: scale(1.12) rotate(90deg);
    background: rgba(255,50,50,0.85);
    box-shadow: 0 6px 20px rgba(255,0,0,0.5);
}