:root {
    --bg-color: #050a14;
    --card-bg: #112240;
    --accent-color: #64ffda;
    --text-primary: #ccd6f6;
    --text-secondary: #8892b0;
    --font-main: 'Noto Sans JP', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    width: 95%;
    margin: 40px auto;
}

header {
    text-align: center;
    margin-bottom: 50px;
}

.banner-wrapper {
    width: 100%;
    margin-bottom: 30px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(100, 255, 218, 0.2);
}

.banner-img {
    width: 100%;
    height: auto;
    display: block;
}

.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: -80px;
}

.icon-img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 5px solid var(--bg-color);
    box-shadow: 0 0 25px rgba(100, 255, 218, 0.3);
    background-color: var(--card-bg);
}

h1 {
    margin-top: 20px;
    font-size: 2.8rem;
    letter-spacing: 3px;
    color: #fff;
}

.concept-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 15px;
    margin-bottom: 40px;
    border-left: 5px solid var(--accent-color);
    text-align: center;
}

.concept-box p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.link-card {
    background: rgba(100, 255, 218, 0.03);
    border: 1px solid rgba(100, 255, 218, 0.1);
    padding: 35px;
    border-radius: 15px;
    text-align: center;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.link-card:hover {
    background: rgba(100, 255, 218, 0.08);
    transform: translateY(-8px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px -15px rgba(100, 255, 218, 0.3);
}

.link-card h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.link-card p {
    font-size: 1rem;
    color: var(--text-secondary);
}

footer {
    text-align: center;
    margin-top: 80px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    letter-spacing: 1px;
}

@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    .profile-section { margin-top: -60px; }
    .icon-img { width: 120px; height: 120px; }
}