/* ========================================
   Reset & Base
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.8;
    color: #333;
    background: #fff;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: bottom;
}

a {
    color: #0055a5;
    text-decoration: underline;
    transition: opacity 0.3s;
}

a:hover {
    opacity: 0.7;
}

/* ========================================
   Header
======================================== */
.l-header {
    width: 100%;
    height: 50px;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    padding: 0 20px;
}

.l-header__inner {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
}

.l-header__logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: #0055a5;
    display: flex;
    align-items: center;
    gap: 5px;
    line-height: 1;
}

.l-header__logo .header_icons {
    height: 1em;
    width: auto;
    vertical-align: middle;
    margin-right: 0.4em;
}

/* ========================================
   Container
======================================== */
.l-container {
    width: 100%;
    overflow: hidden;
}

/* ========================================
   Article
======================================== */
article {
    max-width: 780px;
    margin: 0 auto;
    padding: 40px 20px 60px;
}

article h1 {
    font-size: 1.6rem;
    font-weight: bold;
    color: #1e293b;
    line-height: 1.4;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 3px solid #0055a5;
}

article h2 {
    font-size: 1.25rem;
    font-weight: bold;
    color: #1e293b;
    margin-top: 40px;
    margin-bottom: 14px;
    padding-left: 12px;
    border-left: 4px solid #0055a5;
    line-height: 1.4;
}

article h3 {
    font-size: 1.05rem;
    font-weight: bold;
    color: #333;
    margin-top: 28px;
    margin-bottom: 10px;
    line-height: 1.4;
}

article p {
    margin-bottom: 16px;
    line-height: 1.8;
}

article ul,
article ol {
    margin: 0 0 20px 1.5em;
    line-height: 1.8;
}

article li {
    margin-bottom: 6px;
}

article strong {
    font-weight: bold;
}

/* ========================================
   Footer
======================================== */
.l-footer {
    background: #1e293b;
    color: #fff;
    padding: 40px 20px;
    text-align: center;
    margin-top: 60px;
}

.l-footer__logo {
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.l-footer__copy {
    font-size: 0.75rem;
    opacity: 0.7;
}

.l-footer a {
    color: #fff;
    text-decoration: none;
}

.l-footer a:hover {
    text-decoration: underline;
}

/* ========================================
   Responsive
======================================== */
@media screen and (min-width: 768px) {
    article {
        padding: 50px 40px 80px;
    }

    article h1 {
        font-size: 1.9rem;
    }

    article h2 {
        font-size: 1.35rem;
    }
}