:root {
    --bordo: #760e26;
    --bordo-600: #760e26;
    --text: #1f2937;
    --muted: #6b7280;
    --bg: #fafafa;
    --card: #ffffff;
    --ring: rgba(128,0,32,.25);
    --shadow: 0 10px 25px rgba(0,0,0,.08);
    --radius: 18px;
}

* {
    box-sizing: border-box
}

html, body {
    height: 100%
}

body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #fff, var(--bg) 60%);
}


.hero {
    position: relative;
    overflow: hidden;
    padding: 72px 20px 56px;
    background: radial-gradient(1200px 600px at 10% -20%, #a00031 0%, var(--bordo) 30%, #4a0013 100%);
    color: #fff;
}

    .hero::after {
        content: "";
        position: absolute;
        inset: auto -15% -30% -15%;
        height: 240px;
        background: radial-gradient(80% 100% at 50% 0%, rgba(255,255,255,.18) 0%, rgba(255,255,255,0) 60%);
        filter: blur(20px);
    }

.container {
    max-width: 1120px;
    margin: 0 auto;
}

.hero h1 {
    margin: 0 0 10px;
    font-size: clamp(28px, 4vw, 42px);
    letter-spacing: .3px
}

.subtitle {
    margin: 0;
    opacity: .92;
    font-weight: 500
}

.meta {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 16px;
    font-size: 14px;
    opacity: .95
}

.badge {
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.25);
    padding: 6px 10px;
    border-radius: 999px;
    backdrop-filter: saturate(150%) blur(6px);
}

.layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 28px;
    padding: 32px 20px 64px
}

@media (max-width: 980px) {
    .layout {
        grid-template-columns: 1fr
    }
}

.toc {
    position: sticky;
    top: 20px;
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px
}

    .toc h3 {
        margin: 4px 8px 8px;
        font-size: 14px;
        color: var(--muted);
        text-transform: uppercase;
        letter-spacing: .08em
    }

    .toc a {
        display: block;
        padding: 10px 12px;
        border-radius: 12px;
        color: var(--text);
        text-decoration: none;
        font-size: 15px
    }

        .toc a:hover {
            background: #f3f4f6
        }

        .toc a.active {
            background: rgba(128,0,32,.08);
            color: var(--bordo);
            border-left: 3px solid var(--bordo)
        }

.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden
}

    .card .head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 22px;
        border-bottom: 1px solid #eee
    }

.head .pill {
    font-size: 12px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(128,0,32,.08);
    color: var(--bordo);
    border: 1px solid rgba(128,0,32,.2)
}

.content {
    padding: 8px 22px 26px
}

    .content h2 {
        color: var(--bordo);
        margin: 22px 0 10px;
        font-size: 22px
    }

    .content p {
        margin: 10px 0;
        line-height: 1.75
    }

    .content ul {
        margin: 8px 0 14px 18px
    }

.note {
    background: linear-gradient(0deg, #fff, #fff), radial-gradient(180px 60px at 10% 0%, rgba(128,0,32,.08), rgba(128,0,32,0));
    border: 1px solid #eee;
    border-radius: 14px;
    padding: 14px 16px;
    font-size: 14px;
    color: #374151
}

footer {
    background: var(--bordo);
    color: #fff;
    padding: 22px;
    text-align: center
}

#topBtn {
    position: fixed;
    right: 18px;
    bottom: 20px;
    padding: 12px 14px;
    border: none;
    border-radius: 14px;
    background: var(--bordo);
    color: #fff;
    box-shadow: var(--shadow);
    cursor: pointer;
    opacity: .95
}

    #topBtn:hover {
        background: var(--bordo-600)
    }

.fade {
    animation: fade .6s ease both
}

@keyframes fade {
    from {
        opacity: 0;
        transform: translateY(6px)
    }

    to {
        opacity: 1;
        transform: none
    }
}