/* EIGRP lesson-specific diagrams. Shared cards and navigation come from ospf-series.css. */
.eigrp-series-page .blog-article > .welcome-section {
    margin-bottom: 1.5rem;
    padding: clamp(2rem, 3vw, 2.75rem) clamp(1.25rem, 2.5vw, 2rem);
}

.eigrp-series-page .welcome-section .article-topbar {
    margin-bottom: 1rem;
}

.eigrp-series-page .welcome-section h1 {
    line-height: 1.12;
    margin-bottom: .9rem;
}

.eigrp-series-page .welcome-section p {
    line-height: 1.55;
}

.eigrp-series-page .welcome-section .rip-tag-row {
    margin-top: 1rem;
}

.eigrp-series-page .ospf-metric-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    margin-top: 1.25rem;
}

.eigrp-series-page .ospf-metric-grid > article {
    background: color-mix(in srgb, var(--primary-color) 5%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: .8rem;
    min-width: 0;
    padding: 1rem;
}

.eigrp-series-page .ospf-metric-grid span,
.eigrp-series-page .ospf-metric-grid strong { display: block; }
.eigrp-series-page .ospf-metric-grid span { color: var(--text-muted); font-size: .78rem; margin-bottom: .35rem; }
.eigrp-series-page .ospf-metric-grid strong { color: var(--text-primary); font-size: 1rem; }

.eigrp-series-page :is(.ospf-note, .ospf-warning) {
    background: color-mix(in srgb, var(--primary-color) 5%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    border-radius: .75rem;
    margin: 1rem 0;
    padding: 1rem 1.2rem;
}

.eigrp-series-page .ospf-warning {
    background: color-mix(in srgb, var(--accent-color) 7%, var(--bg-primary));
    border-left-color: var(--accent-color);
}

.eigrp-series-page :is(.ospf-note, .ospf-warning) strong { color: var(--text-primary); }

.eigrp-series-page .ospf-data-table {
    background: color-mix(in srgb, var(--primary-color) 2%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-collapse: separate;
    border-radius: .8rem;
    border-spacing: 0;
    display: block;
    margin-top: 1rem;
    max-width: 100%;
    overflow-x: auto;
    width: 100%;
}

.eigrp-series-page .ospf-data-table :is(thead, tbody) { display: table; min-width: 42rem; table-layout: auto; width: 100%; }
.eigrp-series-page .ospf-data-table tr { display: table-row; }
.eigrp-series-page .ospf-data-table :is(th, td) { border-bottom: 1px solid var(--border-color); color: var(--text-secondary); display: table-cell; line-height: 1.45; padding: .82rem .95rem; text-align: left; vertical-align: top; }
.eigrp-series-page .ospf-data-table th { background: color-mix(in srgb, var(--primary-color) 12%, var(--bg-card)); color: var(--text-primary); font-weight: 800; }
.eigrp-series-page .ospf-data-table tbody tr:last-child td { border-bottom: 0; }

.eigrp-series-page .ospf-cli-grid > article {
    background: #091321;
    border: 1px solid color-mix(in srgb, var(--primary-color) 30%, #26384d);
    border-radius: .85rem;
    min-width: 0;
    overflow: hidden;
}

.eigrp-series-page .ospf-cli-grid > article > h3 { background: #132338; border-bottom: 1px solid #2d4359; color: #f4f8fc !important; font-size: .9rem !important; margin: 0 !important; padding: .75rem .9rem; }
.eigrp-series-page .ospf-cli-grid > article > pre { background: transparent !important; border: 0 !important; border-radius: 0 !important; margin: 0 !important; min-height: 7rem; padding: 1rem !important; }

.eigrp-series-page .ospf-lab-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    margin-top: 1.2rem;
}

.eigrp-series-page .ospf-lab-grid > article { background: color-mix(in srgb, var(--primary-color) 5%, var(--bg-primary)); border: 1px solid var(--border-color); border-left: 4px solid var(--primary-color); border-radius: .8rem; min-width: 0; padding: 1rem; }
.eigrp-series-page .ospf-lab-grid h3 { font-size: 1rem !important; margin: 0 0 .75rem !important; }
.eigrp-series-page .ospf-lab-grid ol { margin: 0; padding-left: 1.2rem; }

.eigrp-series-page .ospf-formula { align-items: center; background: color-mix(in srgb, var(--primary-color) 6%, var(--bg-primary)); border: 1px solid var(--border-color); border-radius: .8rem; display: flex; flex-wrap: wrap; gap: .7rem; justify-content: center; margin: 1rem 0; padding: 1rem; text-align: center; }
.eigrp-series-page .ospf-formula strong { color: var(--primary-color); font-size: 1.3rem; }

/* Keep longer lesson indexes compact without leaving half of the card empty. */
.eigrp-series-page .lesson-outline-card {
    margin-bottom: 1.5rem;
    margin-top: -1rem;
    padding: 1.5rem;
}

.eigrp-series-page .lesson-outline-card h2 {
    font-size: clamp(1.55rem, 2.4vw, 2rem);
    margin-bottom: 1rem;
}

.eigrp-series-page .lesson-outline-card .toc-list {
    column-gap: 3rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 0;
    padding-left: 1.3rem;
}

.eigrp-series-page .lesson-outline-card .toc-list li {
    margin: 0;
    padding: .28rem 0;
}

.eigrp-series-page .lesson-outline-card .toc-list li + li {
    margin-top: 0;
}

.eigrp-series-page .eigrp-topology-map {
    align-items: center;
    background:
        linear-gradient(rgba(88, 208, 197, .045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(88, 208, 197, .045) 1px, transparent 1px),
        color-mix(in srgb, var(--primary-color) 3%, var(--bg-primary));
    background-size: 34px 34px;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    display: grid;
    gap: .75rem;
    grid-template-columns: minmax(8rem, .8fr) minmax(6rem, .55fr) minmax(8rem, .8fr) minmax(6rem, .55fr) minmax(8rem, .8fr);
    margin: 1.35rem 0;
    padding: 1.2rem;
}

.eigrp-series-page .eigrp-router-card {
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: .85rem;
    display: flex;
    flex-direction: column;
    gap: .3rem;
    justify-content: center;
    min-height: 9rem;
    padding: .85rem .55rem;
    text-align: center;
}

.eigrp-series-page .eigrp-router-card.is-source {
    background: color-mix(in srgb, var(--primary-color) 9%, var(--bg-card));
    border-color: var(--primary-color);
}

.eigrp-series-page .eigrp-router-card > i { color: var(--primary-color); font-size: 1.25rem; }
.eigrp-series-page .eigrp-router-card > strong { color: var(--text-primary); font-size: .92rem; }
.eigrp-series-page .eigrp-router-card > code { color: var(--primary-color); font-size: .65rem; }
.eigrp-series-page .eigrp-router-card > small { color: var(--text-muted); font-size: .63rem; line-height: 1.4; }

.eigrp-series-page .eigrp-neighbor-link {
    align-items: center;
    display: flex;
    flex-direction: column;
    gap: .25rem;
    justify-content: center;
    min-height: 5rem;
    position: relative;
    text-align: center;
}

.eigrp-series-page .eigrp-neighbor-link::before {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    content: '';
    height: 4px;
    left: -.75rem;
    position: absolute;
    right: -.75rem;
    top: 50%;
}

.eigrp-series-page .eigrp-neighbor-link > * { background: var(--bg-primary); padding: .1rem .35rem; position: relative; z-index: 1; }
.eigrp-series-page .eigrp-neighbor-link > strong { color: var(--primary-color); font-size: .7rem; }
.eigrp-series-page .eigrp-neighbor-link > span { color: var(--text-muted); font-size: .58rem; }
.eigrp-series-page .eigrp-neighbor-link > small { color: var(--accent-color); font-size: .6rem; font-weight: 800; }

.eigrp-series-page .eigrp-topology-map figcaption {
    color: var(--text-muted);
    font-size: .72rem;
    grid-column: 1 / -1;
    line-height: 1.55;
    text-align: center;
}

.eigrp-series-page .eigrp-table-flow {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin: 1.25rem 0;
}

.eigrp-series-page .eigrp-table-flow article {
    background: color-mix(in srgb, var(--primary-color) 5%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: .85rem;
    min-height: 10rem;
    padding: 1rem;
    position: relative;
}

.eigrp-series-page .eigrp-table-flow article:not(:last-child)::after {
    align-items: center;
    background: var(--primary-color);
    border-radius: 999px;
    color: #062523;
    content: '\2192';
    display: flex;
    font-weight: 900;
    height: 1.7rem;
    justify-content: center;
    position: absolute;
    right: -.86rem;
    top: calc(50% - .85rem);
    width: 1.7rem;
    z-index: 2;
}

.eigrp-series-page .eigrp-table-flow i { color: var(--primary-color); font-size: 1.1rem; }
.eigrp-series-page .eigrp-table-flow h3 { font-size: .95rem; margin: .65rem 0 .45rem; }
.eigrp-series-page .eigrp-table-flow p { color: var(--text-muted); font-size: .72rem; line-height: 1.55; margin: 0; }

.eigrp-series-page #focused-lessons .eigrp-table-flow article {
    display: flex;
    flex-direction: column;
}

.eigrp-series-page #focused-lessons .eigrp-table-flow a {
    color: var(--primary-color);
    font-size: .74rem;
    font-weight: 800;
    margin-top: 1rem;
    text-decoration: none;
}

.eigrp-series-page #focused-lessons .eigrp-table-flow a:hover {
    text-decoration: underline;
}

.eigrp-series-page .eigrp-packet-sequence {
    background: color-mix(in srgb, var(--primary-color) 3%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    display: grid;
    gap: .65rem;
    grid-template-columns: minmax(7rem, .7fr) minmax(14rem, 1.8fr) minmax(7rem, .7fr);
    margin: 1.25rem 0;
    padding: 1rem;
}

.eigrp-series-page .eigrp-packet-endpoint {
    align-items: center;
    align-self: stretch;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: .8rem;
    display: flex;
    flex-direction: column;
    gap: .35rem;
    justify-content: center;
    min-height: 14rem;
    text-align: center;
}

.eigrp-series-page .eigrp-packet-endpoint i { color: var(--primary-color); font-size: 1.25rem; }
.eigrp-series-page .eigrp-packet-endpoint strong { color: var(--text-primary); }
.eigrp-series-page .eigrp-packet-endpoint small { color: var(--text-muted); font-size: .65rem; }
.eigrp-series-page .eigrp-exchange-lane { display: flex; flex-direction: column; gap: .55rem; justify-content: center; }

.eigrp-series-page .eigrp-packet-arrow {
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: .65rem;
    color: var(--text-muted);
    display: grid;
    font-size: .62rem;
    gap: .4rem;
    grid-template-columns: 1fr auto 1fr;
    padding: .5rem .65rem;
    text-align: center;
}

.eigrp-series-page .eigrp-packet-arrow::before,
.eigrp-series-page .eigrp-packet-arrow::after { background: var(--border-color); content: ''; height: 2px; }
.eigrp-series-page .eigrp-packet-arrow.is-right::after,
.eigrp-series-page .eigrp-packet-arrow.is-left::before { background: var(--primary-color); }
.eigrp-series-page .eigrp-packet-arrow strong { color: var(--primary-color); font-size: .68rem; }
.eigrp-series-page .eigrp-packet-arrow span { color: var(--accent-color); }

.eigrp-series-page .eigrp-packet-sequence figcaption {
    color: var(--text-muted);
    font-size: .7rem;
    grid-column: 1 / -1;
    line-height: 1.5;
    text-align: center;
}

.eigrp-series-page .eigrp-neighborship-figure {
    background: color-mix(in srgb, var(--primary-color) 3%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    margin: 1.25rem 0;
    overflow: hidden;
    padding: .75rem;
}

.eigrp-series-page .eigrp-neighborship-image {
    border-radius: .7rem;
    line-height: 0;
    overflow-x: auto;
    scrollbar-color: var(--primary-color) var(--bg-card);
}

.eigrp-series-page .eigrp-neighborship-image:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 3px;
}

.eigrp-series-page .eigrp-neighborship-image img {
    display: block;
    height: auto;
    width: 100%;
}

.eigrp-series-page .eigrp-neighborship-figure figcaption {
    color: var(--text-muted);
    font-size: .82rem;
    line-height: 1.6;
    padding: .8rem .35rem .1rem;
    text-align: left;
}

.eigrp-series-page .eigrp-neighborship-figure figcaption strong {
    color: var(--text-primary);
}

.eigrp-series-page .eigrp-metric-paths {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 1.25rem 0;
}

.eigrp-series-page .eigrp-metric-path {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: .9rem;
    padding: 1rem;
}

.eigrp-series-page .eigrp-metric-path.is-best {
    background: color-mix(in srgb, var(--primary-color) 8%, var(--bg-primary));
    border-color: var(--primary-color);
}

.eigrp-series-page .eigrp-metric-path > span { color: var(--primary-color); font-size: .62rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.eigrp-series-page .eigrp-metric-path h3 { font-size: .95rem; margin: .45rem 0 .75rem; }
.eigrp-series-page .eigrp-metric-path ol { color: var(--text-muted); font-size: .69rem; line-height: 1.55; margin: 0; padding-left: 1.15rem; }
.eigrp-series-page .eigrp-metric-path strong { color: var(--text-primary); }

.eigrp-series-page .eigrp-formula-strip {
    align-items: stretch;
    display: grid;
    gap: .75rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 1.15rem 0;
}

.eigrp-series-page .eigrp-formula-strip > div {
    background: color-mix(in srgb, var(--primary-color) 5%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: .75rem;
    padding: .85rem;
    text-align: center;
}

.eigrp-series-page .eigrp-formula-strip span { color: var(--text-muted); display: block; font-size: .62rem; }
.eigrp-series-page .eigrp-formula-strip strong { color: var(--primary-color); display: block; font-size: .78rem; margin-top: .3rem; }

@media (max-width: 900px) {
    .eigrp-series-page .content-card,
    .eigrp-series-page .ospf-cli-grid,
    .eigrp-series-page .ospf-cli-grid > article { min-width: 0; }
    .eigrp-series-page .content-card pre {
        box-sizing: border-box;
        max-width: 100%;
        overflow-x: auto;
        width: 100%;
    }
    .eigrp-series-page .eigrp-topology-map { grid-template-columns: 1fr; }
    .eigrp-series-page .eigrp-neighbor-link { min-height: 4rem; }
    .eigrp-series-page .eigrp-neighbor-link::before { bottom: -.75rem; height: auto; left: calc(50% - 2px); right: auto; top: -.75rem; width: 4px; }
    .eigrp-series-page .eigrp-table-flow { grid-template-columns: 1fr; }
    .eigrp-series-page .eigrp-table-flow article { min-height: 0; }
    .eigrp-series-page .eigrp-table-flow article:not(:last-child)::after { bottom: -.86rem; content: '\2193'; left: calc(50% - .85rem); right: auto; top: auto; }
    .eigrp-series-page .eigrp-packet-sequence { grid-template-columns: 1fr; }
    .eigrp-series-page .eigrp-packet-endpoint { min-height: 5rem; }
    .eigrp-series-page .eigrp-packet-arrow { grid-template-columns: 1fr; }
    .eigrp-series-page .eigrp-packet-arrow::before,
    .eigrp-series-page .eigrp-packet-arrow::after { display: none; }
    .eigrp-series-page .eigrp-metric-paths { grid-template-columns: 1fr; }
    .eigrp-series-page .eigrp-formula-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .eigrp-series-page .eigrp-neighborship-image img { min-width: 42rem; }

    .eigrp-series-page .blog-article > .welcome-section {
        margin-bottom: 1rem;
        padding: 1.5rem 1.1rem;
    }

    .eigrp-series-page .welcome-section .article-topbar {
        margin-bottom: .8rem;
    }

    .eigrp-series-page .welcome-section h1 {
        margin-bottom: .75rem;
    }

    .eigrp-series-page .welcome-section .rip-tag-row {
        margin-top: .8rem;
    }

    .eigrp-series-page .lesson-outline-card {
        padding: 1.15rem;
    }

    .eigrp-series-page .lesson-outline-card .toc-list {
        display: block;
    }
}