/* ==========================================================================
   全ページ共通のスタイル（common.css）
   ========================================================================== */

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.7;
    color: #333;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
}

header {
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    text-align: center;
}

.header-logo {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

.nav-back {
    margin-bottom: 20px;
    font-size: 14px;
}
.nav-back a {
    color: #555;
    text-decoration: none;
}
.nav-back a:hover {
    text-decoration: underline;
    color: #c0392b;
}

article {
    background: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

h1 {
    font-size: 26px;
    color: #111;
    border-bottom: 2px solid #333;
    padding-bottom: 10px;
    margin-top: 0;
}

h2 {
    font-size: 20px;
    color: #c0392b;
    border-left: 4px solid #c0392b;
    padding-left: 10px;
    margin-top: 35px;
}

p {
    margin: 15px 0;
}

strong {
    color: #c0392b;
}

.btn-wrapper {
    text-align: center;
    margin-top: 40px;
}
.btn-home {
    display: inline-block;
    background-color: #555;
    color: #fff;
    text-decoration: none;
    padding: 12px 30px;
    border-radius: 4px;
    font-weight: bold;
    transition: background-color 0.2s;
}
.btn-home:hover {
    background-color: #333;
}

footer {
    text-align: center;
    padding: 20px 0;
    font-size: 14px;
    color: #777;
    border-top: 1px solid #e0e0e0;
    background-color: #fff;
    margin-top: 60px;
}