:root {
    color-scheme: light dark;
    --bg: #070917;
    --card: rgba(255,255,255,0.08);
    --text: #f4f7ff;
    --accent: #ffd700;
    --muted: rgba(255,255,255,0.7);
    font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
}
* {
    box-sizing: border-box;
}
body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at 20% 20%, #6f7bf7, #492b8c 60%, #1a103d);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text);
}
main.doc {
    width: min(900px, 100%);
    background: rgba(10, 12, 30, 0.85);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 24px;
    padding: clamp(24px, 5vw, 48px);
    box-shadow: 0 40px 80px rgba(0,0,0,0.35);
    backdrop-filter: blur(6px);
    position: relative;
    z-index: 1;
}
.doc__back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 0.04em;
}
.doc__back::before {
    content: "←";
}
.doc__lead {
    font-size: 1.05rem;
    color: var(--muted);
    line-height: 1.7;
}
h1 {
    margin: 0 0 10px;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
}
section {
    margin-top: 32px;
    padding: 24px;
    background: var(--card);
    border-radius: 18px;
    border: 1px solid rgba(255,255,255,0.08);
}
section h2 {
    margin: 0 0 12px;
    font-size: 1.3rem;
    color: var(--accent);
}
ul, ol {
    margin: 0;
    padding-left: 20px;
    line-height: 1.6;
}
.badge {
    display: inline-block;
    margin-top: 12px;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(255, 215, 0, 0.15);
    color: var(--accent);
    font-size: 0.85rem;
}
@media (max-width: 640px) {
    body {
        padding: 24px 12px;
    }
    section {
        padding: 18px;
    }
}