body {
    margin: 0;
    font-family: "Verdana", "Geneva", "Tahoma", sans-serif;
    background: #d0d8e8;
    color: #101820;
}
.container {
    width: 100vw;
    max-width: 1040px;
    margin: 0 auto;
    background: #ffffff;
    border: 1px solid #4c6185;
    padding: 30px 40px 70px 40px;
}
header {
    background: #0c2c58;
    color: #fff;
    padding: 16px 40px;
    border-bottom: 3px solid #7890b4;
}
header .logo {
    font-size: 26px;
    font-weight: bold;
    text-transform: lowercase;
}
header .logo a {
    color: #fff;
    text-decoration: none;
}
header .logo a:hover {
    text-decoration: underline;
}
nav {
    margin-top: 4px;
}
nav a {
    color: #f8f8f8;
    margin-right: 10px;
    text-decoration: underline;
    font-size: 13px;
}
nav a:hover {
    color: #b3d3ff;
}
section {
    margin-top: 32px;
    padding-top: 12px;
    border-top: 1px solid #b1b1b1;
}
h2 {
    font-size: 20px;
    margin-bottom: 8px;
    color: #0c2c58;
}
p {
    line-height: 1.5;
}
ul {
    padding-left: 20px;
}
.hero {
    background: #f1f5ff;
    border: 1px solid #5d84c1;
    padding: 20px;
    margin-top: 30px;
}
.hero h1 {
    font-size: 24px;
    margin: 0 0 10px 0;
    color: #152d55;
}
.hero p {
    margin: 0 0 12px 0;
}
.cta-group a {
    display: inline-block;
    padding: 5px 14px;
    border: 1px solid #0c2c58;
    margin-right: 8px;
    font-weight: bold;
    font-size: 13px;
    text-decoration: none;
    background: #e7ebf9;
    color: #0c2c58;
}
.cta-primary {
    background: #0c2c58;
    color: #fff;
}
.problem-block {
    border: 1px solid #b64b4b;
    background: #fff4f2;
    padding: 18px;
}
.columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
}
.feature-box {
    border: 1px solid #9ca3b8;
    background: #f9f9f9;
    padding: 12px;
    font-size: 14px;
}
.feature-box h3 {
    margin-top: 0;
    font-size: 15px;
    color: #11315c;
}
pre {
    background: #f3f4f7;
    border: 1px solid #7280a4;
    padding: 12px;
    font-size: 13px;
    overflow-x: auto;
}
code {
    font-family: "Courier New", Courier, monospace;
}
.steps-list li {
    margin-bottom: 6px;
}
.license-box {
    border: 1px solid #696969;
    background: #fdfdfd;
    padding: 16px;
    font-size: 14px;
}
details.spoiler {
    border: 1px solid #5d84c1;
    background: #f1f5ff;
    padding: 12px;
    margin-top: 18px;
    font-size: 14px;
}
details.spoiler summary {
    cursor: pointer;
    font-weight: bold;
    color: #0c2c58;
    text-decoration: underline;
}
details.spoiler summary span {
    display: block;
    font-weight: normal;
    color: #101820;
    margin-top: 4px;
    text-decoration: none;
}
details.spoiler .spoiler-content {
    margin-top: 12px;
}
details.spoiler ol {
    padding-left: 18px;
}
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
table th, table td {
    border: 1px solid #9ca3b8;
    padding: 8px;
    text-align: left;
}
table th {
    background: #eef1f8;
}
.note {
    background: #fff4d8;
    border: 1px solid #d6c48c;
    padding: 12px;
    font-size: 14px;
}
footer {
    text-align: center;
    margin-top: 40px;
    padding: 15px 0 30px 0;
    font-size: 13px;
    color: #1b1b1b;
}
@media (max-width: 1040px) {
    header {
        padding-left: 20px;
        padding-right: 20px;
    }
    .container {
        padding: 20px;
        width: 90vw;
    }
    nav a {
        display: inline-block;
        margin-bottom: 6px;
    }
    .cta-group a {
        margin-bottom: 6px;
    }
}