:root {
    --bg-color: #ffffff;
    --text-color: #111111;
    --sub-text-color: #888888;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "BIZ UDPGothic", Meiryo, sans-serif;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.container {
    text-align: center;
    padding: 20px;
    cursor: default;
}

h1 {
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 1200;
    letter-spacing: 0.15em;
    line-height: 1.6;
    margin-bottom: 1rem;
    white-space: nowrap;
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.jp-sub-text {
    font-size: 1.3rem;
    color: var(--sub-text-color);
    letter-spacing: 0.1em;
    font-weight: 600;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeInSub 1.2s ease-out 0.3s forwards;
}

.fade-in-title {
    animation: fadeInTitle 1.2s ease-out forwards;
}

@keyframes fadeInTitle {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes fadeInSub {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}