body {
    font-family: Arial, sans-serif;
    background-color: black;
    color: #ffffff;
    text-align: center;
    margin: 0;
    padding: 0;
    overflow-y: auto;
}
.matrix {
    position: fixed;
    width: 100%;
    height: 100%;
    background: black;
    z-index: -1;
    top: 0;
    left: 0;
}

/* --- Navbar --- */
.navbar {
    background-color: rgba(30, 30, 30, 0.9);
    padding: 15px 0;
    display: flex;
    justify-content: center;        /* 中央寄せ */
    align-items: center;
    gap: 30px;                      /* 項目間の間隔を拡大 */
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 10;
    box-sizing: border-box;
}

.navbar a {
    color: #00ffcc;
    text-decoration: none;
    font-size: 18px;
    padding: 0 10px;
    display: inline-block;
    text-align: center;
}

.navbar a:hover {
    text-decoration: underline;
}

.lang-switcher {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-left: 25px;
}

.lang-label {
    color: #00ffcc;
    font-size: 15px;
    margin-right: 4px;
}

.lang-btn {
    background: #00322e;
    color: #00ffcc;
    border: 1px solid #00ffcc;
    border-radius: 5px;
    padding: 2px 12px;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.18s, color 0.18s;
}

.lang-btn.active, .lang-btn:hover {
    background: #00ffcc;
    color: #00201c;
}

.container {
    position: relative;
    max-width: 1200px;
    margin: 80px auto 50px;
    padding: 20px;
    background-color: rgba(30, 30, 30, 0.9);
    border-radius: 10px;
    box-shadow: 0px 0px 10px rgba(255, 255, 255, 0.2);
}

.icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin-top: 10px;
}

a {
    color: #00ffcc;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

.sns-links {
    margin-top: 16px;
    margin-bottom: 8px;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}
.sns-links a {
    color: #00ffcc;
    font-size: 20px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
}
.sns-links.sns-noicon a {
    font-size: 22px;
    padding: 3px 16px;
    background: none;
    border-radius: 7px;
    border: 1.2px solid transparent;
    transition: border 0.22s;
}
.sns-links.sns-noicon a:hover {
    border: 1.2px solid #00ffcc;
    background: rgba(0,255,204,0.05);
}

.skills-frame {
    border: 2px solid #00ffcc;
    border-radius: 14px;
    background: rgba(0,32,32,0.80);
    margin: 40px auto 0;
    padding: 32px;
    max-width: 920px;
    text-align: left;
    box-shadow: 0 0 18px 0 #00ffcc33;
}
.skills-frame h2 {
    color: #00ffcc;
    border-bottom: 1px solid #00ffcc44;
    padding-bottom: 7px;
    margin-bottom: 22px;
    font-size: 2em;
    text-align: center;
}
.skills-frame h3 {
    color: #00ffd0;
    margin-top: 32px;
    font-size: 1.3em;
}
.skills-frame ul {
    margin-left: 18px;
}
.skills-frame li {
    margin: 7px 0;
}
.skills-frame code {
    background: #003333;
    color: #00ffd0;
    padding: 2px 7px;
    border-radius: 5px;
    font-size: 1em;
}
.skills-frame .tech-list {
    margin-top: 8px;
    margin-bottom: 10px;
    line-height: 2;
}
.skills-frame .tag {
    display: inline-block;
    background: #00ffcc27;
    color: #00ffd0;
    border: 1px solid #00ffcc88;
    border-radius: 5px;
    padding: 2px 7px;
    margin: 2px 6px 2px 0;
    font-size: 1em;
}