/* ----------------------------------
   Global Styles & Variables
   ---------------------------------- */
:root {
    --neon-blue: #00f2ff;
    --neon-purple: #7000ff;
    --neon-orange: #ff9900;
    --dark-bg: #050b15;
    --glass-bg: rgba(10, 20, 35, 0.6);
}

body {
    background-color: var(--dark-bg);
    color: #ffffff;
    font-family: 'Courier New', Courier, monospace;
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* グリッド背景の生成 */
.grid-background {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: 
        linear-gradient(rgba(0, 242, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 242, 255, 0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: -1;
}

/* ----------------------------------
   Header & Glitch Effect
   ---------------------------------- */
header { 
    text-align: center; 
    padding: 80px 20px;
}

h1 {
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue);
    letter-spacing: 5px;
    position: relative;
    display: inline-block;
    animation: glitch 3s linear infinite;
    font-size: 2.5rem;
}

@keyframes glitch {
    0%, 100% { transform: translate(0); }
    2% { transform: translate(-2px, 1px); }
    4% { transform: translate(2px, -1px); }
    6% { transform: translate(0); }
}

.subtitle { color: #888; letter-spacing: 2px; margin-top: 10px; }

/* ----------------------------------
   App Grid & Cards
   ---------------------------------- */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

.app-card {
    background: var(--glass-bg);
    border: 1px solid var(--neon-blue);
    padding: 40px;
    border-radius: 4px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    backdrop-filter: blur(10px);
}

.app-card:hover {
    transform: translateY(-12px) scale(1.02);
    background-color: rgba(0, 242, 255, 0.1);
    border-color: #fff;
    box-shadow: 0 0 25px rgba(0, 242, 255, 0.4);
}

.icon { font-size: 3rem; margin-bottom: 20px; }

/* ----------------------------------
   Buttons
   ---------------------------------- */
.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 30px;
    background: transparent;
    border: 1px solid var(--neon-orange);
    color: var(--neon-orange);
    text-decoration: none;
    font-weight: bold;
    border-radius: 4px;
    transition: all 0.3s;
}

.btn:hover {
    background: var(--neon-orange);
    color: #000;
    box-shadow: 0 0 20px var(--neon-orange);
}

/* ----------------------------------
   Notice Section
   ---------------------------------- */
.notice-section {
    margin-top: 80px;
    padding: 60px 20px;
    background: rgba(112, 0, 255, 0.05);
    border-top: 1px solid var(--neon-purple);
    text-align: center;
}

.notice-container { max-width: 800px; margin: 0 auto; text-align: left; }
.notice-container h3 { color: var(--neon-orange); margin-bottom: 20px; }
.notice-container ul { list-style: none; padding: 0; }
.notice-container li { margin-bottom: 10px; font-size: 0.9rem; padding-left: 20px; position: relative; }

.official-btn {
    display: inline-block;
    margin-top: 40px;
    padding: 15px 40px;
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    text-decoration: none;
    transition: all 0.3s;
}

.official-btn:hover {
    background: var(--neon-blue);
    color: #000;
}

/* ----------------------------------
   Footer
   ---------------------------------- */
footer {
    padding: 40px 20px;
    background-color: #000;
    text-align: center;
    font-size: 0.8rem;
    color: #555;
    border-top: 1px solid #222;
}