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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
header {
    text-align: center;
    padding: 60px 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    margin-bottom: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.tagline {
    font-size: 18px;
    color: #666;
    margin-bottom: 30px;
}

/* Navigation */
.nav-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-links a,
.btn {
    display: inline-block;
    padding: 14px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.nav-links a:hover,
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* Content Card */
.content-card {
    background: white;
    border-radius: 20px;
    padding: 50px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

/* Typography */
h1 {
    font-size: 36px;
    font-weight: 800;
    color: #667eea;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 3px solid #667eea;
}

h2 {
    font-size: 28px;
    font-weight: 700;
    color: #764ba2;
    margin-top: 40px;
    margin-bottom: 20px;
}

h3 {
    font-size: 20px;
    font-weight: 600;
    color: #555;
    margin-top: 30px;
    margin-bottom: 15px;
}

p {
    margin-bottom: 20px;
    color: #555;
}

/* Lists */
ul, ol {
    margin: 20px 0 20px 30px;
    color: #555;
}

li {
    margin-bottom: 12px;
}

/* Strong Text */
strong {
    color: #333;
    font-weight: 600;
}

/* Links */
a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-left: 4px solid #667eea;
    padding: 20px;
    margin: 30px 0;
    border-radius: 8px;
}

.warning-box {
    background: rgba(255, 152, 0, 0.1);
    border-left: 4px solid #ff9800;
    padding: 20px;
    margin: 30px 0;
    border-radius: 8px;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    color: white;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 20px;
    margin-top: 40px;
}

.footer-links {
    display: flex;
    gap: 30px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    font-weight: 500;
}

.footer-links a:hover {
    color: #ddd;
}

/* Last Updated */
.last-updated {
    font-size: 14px;
    color: #888;
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }

    header {
        padding: 40px 20px;
    }

    .logo {
        font-size: 36px;
    }

    .content-card {
        padding: 30px 20px;
    }

    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 24px;
    }

    .nav-links {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links a,
    .btn {
        display: block;
        text-align: center;
    }

    table {
        font-size: 14px;
    }

    th, td {
        padding: 10px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }

    .nav-links,
    footer {
        display: none;
    }

    .content-card {
        box-shadow: none;
        padding: 20px;
    }
}