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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: radial-gradient(circle at center, #2a2a2a 0%, #1a1a1a 100%) fixed;
    color: #e0e0e0;
    min-height: 100vh;
}

.main-nav {
    position: fixed;
    top: 24px;
    right: 40px;
    z-index: 1000;
    background: #252525;
    border: 1px solid #404040;
    border-radius: 8px;
    padding: 16px 24px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 24px;
    margin: 0;
    padding: 0;
}

.nav-list li a {
    color: #c0c0c0;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-list li a:hover {
    color: #f5f5f5;
}

.top-spacer {
    height: 48px;
}

.banner {
    position: relative;
    width: 100%;
    height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    border-top: 2px solid #3a3a3a;
    border-bottom: 2px solid #3a3a3a;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.logo-container {
    position: relative;
    z-index: 10;
    padding: 80px;
    max-width: 90%;
}

.logo {
    width: 100%;
    height: auto;
    max-width: 800px;
    display: block;
    filter: drop-shadow(0 4px 16px rgba(0, 0, 0, 0.6));
}

.intro-section {
    padding: 80px 40px;
    background: #252525;
    position: relative;
    border-top: 2px solid #3a3a3a;
    border-bottom: 2px solid #3a3a3a;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.intro-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: left;
    opacity: 0;
    animation: fadeInUp 1s ease-out 1s forwards;
}

.intro-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #f5f5f5;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.intro-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: #c0c0c0;
    max-width: 900px;
    margin: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-wrapper {
    padding: 60px 40px;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 1400px;
    margin: 0 auto;
}

.content-box {
    background: #252525;
    border: 1px solid #404040;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-box:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.box-title {
    background: linear-gradient(135deg, #2d2d2d 0%, #1f1f1f 100%);
    padding: 20px 24px;
    font-size: 1.25rem;
    font-weight: 600;
    color: #f0f0f0;
    border-bottom: 1px solid #404040;
}

.box-content {
    padding: 24px;
    color: #c0c0c0;
    line-height: 1.6;
}

.box-content p {
    margin: 0;
}

.footer {
    background: linear-gradient(180deg, #1a1a1a 0%, #0f0f0f 100%);
    padding: 60px 40px;
    border-top: 1px solid #2a2a2a;
    box-shadow: inset 0 8px 24px rgba(0, 0, 0, 0.6);
    position: relative;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
    color: #808080;
    font-size: 0.95rem;
}

.footer-content p {
    margin: 0;
}

.logo-link {
    position: fixed;
    top: 24px;
    left: 40px;
    z-index: 1000;
    display: block;
}

.header-logo {
    height: 50px;
    width: auto;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.5));
    transition: opacity 0.3s ease;
}

.header-logo:hover {
    opacity: 0.8;
}

.page-header {
    padding: 120px 40px 60px;
    background: #252525;
    border-bottom: 2px solid #3a3a3a;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.page-header-content {
    max-width: 1400px;
    margin: 0 auto;
}

.page-title {
    font-size: 3rem;
    font-weight: 700;
    color: #f5f5f5;
    margin: 0;
    letter-spacing: -1px;
}

.content-page {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 40px;
}

.content-article {
    max-width: 900px;
}

.article-section {
    margin-bottom: 48px;
}

.article-section h2 {
    font-size: 2rem;
    font-weight: 600;
    color: #f5f5f5;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.article-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #c0c0c0;
    margin-bottom: 16px;
}

.article-section p:last-child {
    margin-bottom: 0;
}

@media (max-width: 1024px) {
    .logo-link {
        left: 32px;
    }

    .header-logo {
        height: 45px;
    }

    .main-nav {
        right: 32px;
        padding: 14px 20px;
    }

    .nav-list {
        gap: 20px;
    }

    .nav-list li a {
        font-size: 0.9rem;
    }

    .page-header {
        padding: 100px 32px 48px;
    }

    .page-title {
        font-size: 2.5rem;
    }

    .content-page {
        padding: 48px 32px;
    }

    .article-section h2 {
        font-size: 1.8rem;
    }

    .article-section p {
        font-size: 1.05rem;
    }

    .content-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .logo-container {
        padding: 60px;
    }

    .intro-section {
        padding: 60px 32px;
    }

    .intro-title {
        font-size: 2.2rem;
    }

    .intro-text {
        font-size: 1.1rem;
    }

    .content-wrapper {
        padding: 48px 32px;
    }

    .footer {
        padding: 48px 32px;
    }
}

@media (max-width: 768px) {
    .logo-link {
        left: 24px;
        top: 20px;
    }

    .header-logo {
        height: 40px;
    }

    .main-nav {
        right: 24px;
        top: 20px;
        padding: 12px 16px;
    }

    .nav-list {
        gap: 16px;
    }

    .nav-list li a {
        font-size: 0.85rem;
    }

    .page-header {
        padding: 90px 24px 40px;
    }

    .page-title {
        font-size: 2rem;
    }

    .content-page {
        padding: 40px 24px;
    }

    .article-section {
        margin-bottom: 40px;
    }

    .article-section h2 {
        font-size: 1.6rem;
    }

    .article-section p {
        font-size: 1rem;
    }

    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .logo-container {
        padding: 40px;
    }

    .logo {
        max-width: 600px;
    }

    .intro-section {
        padding: 48px 24px;
    }

    .intro-title {
        font-size: 2rem;
    }

    .intro-text {
        font-size: 1rem;
        line-height: 1.6;
    }

    .content-wrapper {
        padding: 40px 24px;
    }

    .box-title {
        padding: 16px 20px;
        font-size: 1.1rem;
    }

    .box-content {
        padding: 20px;
    }

    .footer {
        padding: 40px 24px;
    }
}

@media (max-width: 480px) {
    .logo-container {
        padding: 24px;
    }

    .logo {
        max-width: 400px;
    }

    .intro-section {
        padding: 40px 16px;
    }

    .intro-title {
        font-size: 1.6rem;
    }

    .intro-text {
        font-size: 0.95rem;
    }

    .content-wrapper {
        padding: 32px 16px;
    }

    .footer {
        padding: 32px 16px;
    }
}