:root {
    --primary-green: #009A9C;
    --dark-green: #027a7c;
    --light-gray: #f0f2f5;
    --text-gray: #6c757d;
    --dark-text: #333;
    --white: #fff;
    --border-color: #dde3e8;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--dark-text);
    background: var(--light-gray);
}

.page-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand-link {
    display: inline-flex;
    align-items: center;
}

.logo {
    width: 150px;
    height: auto;
}

.header-nav {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.header-nav a {
    color: var(--text-gray);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    padding: 8px 10px;
    border-radius: 8px;
}

.header-nav a:hover {
    color: var(--dark-text);
    background: #f4f7f9;
}

.header-nav a.active {
    color: var(--primary-green);
    background: #e9f7f7;
}

.content-wrap {
    max-width: 980px;
    margin: 36px auto;
    padding: 0 20px 28px;
}

.content-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 30px;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.05);
}

.content-card h1 {
    margin: 0 0 10px;
    font-size: 30px;
    line-height: 1.2;
}

.subtitle {
    margin: 0 0 24px;
    color: var(--text-gray);
    font-size: 14px;
}

.content-card section {
    margin-bottom: 22px;
}

.content-card h2 {
    margin: 0 0 10px;
    font-size: 20px;
}

.content-card p {
    margin: 0 0 10px;
    line-height: 1.65;
}

.content-card a {
    color: var(--primary-green);
    text-decoration: none;
}

.content-card a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .page-header {
        padding: 14px 16px;
    }

    .logo {
        width: 130px;
    }

    .header-nav {
        gap: 8px;
    }

    .content-wrap {
        margin-top: 24px;
        padding: 0 14px 20px;
    }

    .content-card {
        padding: 22px;
    }

    .content-card h1 {
        font-size: 25px;
    }

    .content-card h2 {
        font-size: 18px;
    }
}