/* =====================
   ランディングページ専用CSS
   ===================== */

:root {
    --neon-blue: #00e5ff;
    --neon-pink: #ff00c8;
    --neon-green: #39ff14;
    --bg-night: #050510;
    --text-main: #f0f0ff;
    --btn-border: rgba(0, 229, 255, 0.8);
}

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

body {
    background: var(--bg-night);
    color: var(--text-main);
    font-family: 'Orbitron', sans-serif;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ドット絵Canvasを全面に */
#pixel-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    image-rendering: pixelated;
}

/* 中央のコンテンツ */
.entrance-container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.2) 0%, rgba(0, 0, 0, 0.7) 100%);
}

.entrance-box {
    text-align: center;
    padding: 60px 80px;
    border: 1px solid rgba(0, 229, 255, 0.15);
    border-radius: 16px;
    background: rgba(5, 5, 20, 0.6);
    backdrop-filter: blur(8px);
    box-shadow: 0 0 40px rgba(0, 229, 255, 0.05), inset 0 0 30px rgba(0, 0, 0, 0.3);
    animation: float 4s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* アイコン */
.portal-icon {
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 20px;
    animation: spin 10s linear infinite;
    display: inline-block;
    color: var(--neon-blue);
    text-shadow: 0 0 20px var(--neon-blue);
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* タイトル */
.portal-title {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: 6px;
    margin-bottom: 14px;
}

.glow-text {
    color: #fff;
    text-shadow:
        0 0 5px #fff,
        0 0 15px #fff,
        0 0 30px var(--neon-pink),
        0 0 60px var(--neon-pink);
}

.portal-sub {
    font-size: 0.95rem;
    color: rgba(200, 200, 255, 0.6);
    letter-spacing: 2px;
    margin-bottom: 50px;
    font-family: sans-serif;
}

/* 入口ボタン */
.enter-btn {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    padding: 16px 40px;
    border: 2px solid var(--btn-border);
    color: var(--neon-blue);
    text-decoration: none;
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.enter-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--neon-blue);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
    z-index: -1;
}

.enter-btn:hover {
    color: var(--bg-night);
    box-shadow: 0 0 25px var(--neon-blue), 0 0 50px rgba(0, 229, 255, 0.3);
}

.enter-btn:hover::before {
    transform: scaleX(1);
}

.arrow {
    font-size: 1.3rem;
    transition: transform 0.3s ease;
}

.enter-btn:hover .arrow {
    transform: translateX(6px);
}