:root {
    --bg: #0d1117;
    --bg2: #161b22;
    --text: #e6edf3;
    --accent: #5865f2;
    --border: #30363d;
    --muted: #8b949e;
}
body.light {
    --bg: #ffffff;
    --bg2: #f5f5f5;
    --text: #111111;
    --accent: #5865f2;
    --border: #d0d7de;
    --muted: #57606a;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: all 0.3s;
}
header {
    background: var(--bg2);
    padding: 20px 24px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    position: relative;
}
.back-home {
    position: absolute;
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: opacity 0.2s;
}
.back-home:hover { opacity: 0.8; }
header h1 {
    font-size: 28px;
    font-weight: 700;
}
.container {
    max-width: 820px;
    margin: 60px auto;
    padding: 0 24px;
    flex: 1;
}
.last-updated {
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 32px;
    font-size: 15px;
}
h2 {
    font-size: 28px;
    margin: 48px 0 18px;
    color: var(--accent);
    font-weight: 700;
}
h3 {
    font-size: 21px;
    margin: 32px 0 14px;
    color: var(--text);
    font-weight: 600;
}
p, li {
    color: var(--muted);
    font-size: 16.5px;
    margin-bottom: 14px;
}
ul {
    padding-left: 28px;
    margin: 18px 0;
}
li {
    margin: 10px 0;
}
strong {
    color: var(--text);
    font-weight: 600;
}
a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}
a:hover { text-decoration: underline; }
.highlight {
    background: var(--bg2);
    padding: 26px 28px;
    border-radius: 16px;
    border-left: 6px solid var(--accent);
    margin: 36px 0;
    font-size: 16.5px;
    line-height: 1.8;
    color: var(--text);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}
.highlight strong {
    color: white;
    display: block;
    margin-bottom: 10px;
    font-size: 17px;
}
footer {
    margin-top: auto;
    background: var(--bg2);
    padding: 50px 20px 40px;
    text-align: center;
    border-top: 1px solid var(--border);
    font-size: 14.5px;
    opacity: 0.9;
}


@media (max-width: 768px) {
    header { padding: 18px 20px; }
    header h1 { font-size: 26px; }
.back-home { left: 20px; font-size: 14.5px; }
.container { margin: 50px auto; padding: 0 20px; }
    h2 { font-size: 26px; margin: 40px 0 16px; }
    h3 { font-size: 20px; }
    p, li { font-size: 16px; }
.highlight { padding: 24px; }
}

@media (max-width: 480px) {
    header { padding: 16px; text-align: center; }
.back-home {
        position: static;
        transform: none;
        display: block;
        margin-bottom: 12px;
        font-size: 15.5px;
    }
    header h1 { font-size: 24px; }
.container { margin: 40px auto; padding: 0 16px; }
    h2 { font-size: 24px; margin: 36px 0 14px; }
.highlight { padding: 22px; border-left-width: 5px; }
    ul { padding-left: 22px; }
.highlight strong { font-size: 16.5px; }
}