body {
    background-color: #0a0a0e; /* 深く暗い鋼鉄の色 */
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    font-family: 'Consolas', 'Courier New', monospace;
    color: #a0a0b0;
    overflow-y: auto;
}

.container {
    max-width: 700px;
    width: 100%;
    min-height: 100vh;
    background-color: #0d0d12; /* ボディよりわずかに明るい装甲色 */
    border-left: 1px solid #25252e;
    border-right: 1px solid #25252e;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    padding: 40px 20px;
    box-sizing: border-box;
}

h1 {
    color: #00f2ff; /* サイバーブルー */
    padding: 30px 20px;
    font-size: 1.2rem;
    text-transform: uppercase;
    background: linear-gradient(135deg, #14141a 0%, #25252e 100%);
    border-left: 10px solid #00f2ff; /* 少し細くしてバランス調整 */
    border-right: 5px solid #111;
    border-top: 5px solid #333;
    border-bottom: 5px solid #000;
    box-shadow: 
        10px 10px 30px rgba(0, 0, 0, 0.8), 
        0 0 15px rgba(0, 242, 255, 0.2);
    text-shadow: 0 0 10px rgba(0, 242, 255, 0.8);
    letter-spacing: 0.1em;
    clip-path: polygon(0% 0%, 95% 0%, 100% 15%, 100% 100%, 5% 100%, 0% 85%); /* 無骨な装甲のような形 */
    position: relative;
    margin-bottom: 40px;
}

.content {
    background: rgba(20, 20, 26, 0.8);
    border: 1px solid #25252e;
    padding: 30px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
    opacity: 0; /* JSでフェードインさせるため初期値は0 */
    transition: opacity 1.5s ease-in;
}

section {
    margin-bottom: 30px;
    border-bottom: 1px solid #1a1a20;
    padding-bottom: 20px;
}

section:last-child {
    border-bottom: none;
}

h2 {
    color: #00f2ff;
    font-size: 1.2em;
    border-left: 4px solid #00f2ff;
    padding-left: 15px;
    margin-bottom: 15px;
    text-transform: uppercase;
}

p {
    line-height: 1.6;
    margin: 10px 0;
}

ul {
    list-style: none;
    padding-left: 10px;
}

li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
}

li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: #00f2ff;
}

a {
    color: #00f2ff;
    text-decoration: none;
    border-bottom: 1px dashed #00f2ff;
    transition: all 0.3s ease;
}

a:hover {
    text-shadow: 0 0 10px rgba(0, 242, 255, 0.8);
    border-bottom: 1px solid #00f2ff;
}

.cursor {
    display: inline-block;
    width: 0.6em;
    height: 1.1em;
    background-color: #00f2ff;
    margin-left: 5px;
    vertical-align: middle;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* 画面幅がコンテナ最大幅（700px）以下の場合は枠線を消して全画面に見せる */
@media (max-width: 700px) {
    .container {
        border-left: none;
        border-right: none;
        box-shadow: none;
    }
}