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

body {
    font-family: 'Segoe UI', 'Hiragino Sans', 'Yu Gothic', sans-serif;
    line-height: 1.8;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8f0f8 100%);
}

header {
    background: #fff;
    padding: 1.5rem 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2c5aa0;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.patent-badge {
    font-size: 0.65rem;
    background: #e3f2fd;
    color: #2c5aa0;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.hamburger-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
}

.patent-notice {
    font-size: 0.65rem;
    font-weight: 600;
    color: #1565c0;
    background: #b3d9ff;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    text-align: center;
    line-height: 1.3;
    white-space: nowrap;
    margin-left: -1rem;
}

.hamburger-menu {
    width: 40px;
    height: 40px;
    background: white;
    border: 2px solid #2c5aa0;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    padding: 8px;
    transition: all 0.3s;
    position: relative;
    z-index: 1001;
    margin-left: -0.45cm;
}

.hamburger-menu:hover {
    background: #f0f4f8;
}

.hamburger-menu span {
    display: block;
    width: 20px;
    height: 2px;
    background: #2c5aa0;
    transition: all 0.3s;
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.dropdown-menu {
    position: absolute;
    top: 50px;
    left: 0;
    background: white;
    border: 2px solid #2c5aa0;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: none;
    flex-direction: column;
    min-width: 180px;
    overflow: hidden;
    z-index: 1000;
}

.dropdown-menu.active {
    display: flex;
}

.dropdown-menu a {
    padding: 1rem 1.5rem;
    color: #2c5aa0;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border-bottom: 1px solid #e3f2fd;
}

.dropdown-menu a:last-child {
    border-bottom: none;
}

.dropdown-menu a:hover {
    background: #f0f4f8;
    padding-left: 2rem;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.content-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    padding: 3rem;
}

h1 {
    font-size: 2.2rem;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid #2c5aa0;
}

.update-date {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.6rem;
    color: #2c5aa0;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 5px solid #2c5aa0;
}

h3 {
    font-size: 1.2rem;
    color: #1a1a1a;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.9;
}

ul, ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

.highlight-box {
    background: #e3f2fd;
    border-left: 4px solid #2c5aa0;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
}

.highlight-box strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    color: #1565c0;
}

.important {
    background: #fff3e0;
    border-left: 4px solid #ff9800;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
}

.important strong {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    color: #e65100;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

th, td {
    border: 1px solid #e0e0e0;
    padding: 1rem;
    text-align: left;
}

th {
    background: #f5f5f5;
    font-weight: 600;
    color: #1a1a1a;
}

footer {
    background: #1a1a1a;
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
}

footer p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.back-link {
    display: inline-block;
    margin-top: 2rem;
    padding: 0.8rem 1.5rem;
    background: #2c5aa0;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
}

.back-link:hover {
    background: #234a85;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .content-card {
        padding: 2rem 1.5rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    .container {
        padding: 2rem 1rem;
    }

    table {
        font-size: 0.9rem;
    }

    th, td {
        padding: 0.75rem;
    }
}