* {
    box-sizing: border-box;
}

:root {
    --bg: #09111d;
    --panel: #101b2b;
    --text: #f4f7fb;
    --muted: #8ea0b8;
    --border: rgba(255,255,255,.08);

    --orange: #ff7a00;
    --blue: #1f8fff;

    --green: #28d17c;
    --yellow: #ffbf38;
    --red: #ff4d5d;
    --gray: #73849b;
}

html,
body {
    margin: 0;
    min-height: 100%;
    background:
        radial-gradient(circle at 20% 0%, rgba(31,143,255,.10), transparent 35%),
        radial-gradient(circle at 90% 10%, rgba(255,122,0,.08), transparent 30%),
        var(--bg);
    color: var(--text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar {
    height: 86px;
    padding: 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    background: rgba(9,17,29,.82);
    backdrop-filter: blur(14px);
    position: sticky;
    top: 0;
    z-index: 30;
}

.brand {
    display: flex;
    align-items: center;
    gap: 15px;
}

.brand-mark {
    width: 53px;
    height: 53px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    font-weight: 900;
    letter-spacing: -2px;
    font-size: 21px;
    background: linear-gradient(135deg, var(--orange), #ff9a3d);
    color: white;
    box-shadow: 0 10px 28px rgba(255,122,0,.22);
}

h1, h2, p {
    margin: 0;
}

h1 {
    font-size: 20px;
    letter-spacing: -.3px;
}

.subtitle {
    color: var(--muted);
    font-size: 12px;
    margin-top: 4px;
}

.live {
    color: var(--muted);
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.live-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 0 5px rgba(40,209,124,.10);
}

.divider {
    opacity: .5;
}

main {
    width: min(1600px, calc(100% - 40px));
    margin: 24px auto 50px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0,1fr));
    gap: 15px;
    margin-bottom: 18px;
}

.summary-card {
    min-height: 126px;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: linear-gradient(160deg, rgba(255,255,255,.035), rgba(255,255,255,.01)), var(--panel);
    position: relative;
    overflow: hidden;
}

.summary-card::after {
    content: "";
    width: 90px;
    height: 90px;
    position: absolute;
    right: -24px;
    bottom: -30px;
    border-radius: 50%;
    background: rgba(31,143,255,.08);
}

.summary-card.ok::after { background: rgba(40,209,124,.10); }
.summary-card.warning::after { background: rgba(255,191,56,.12); }
.summary-card.down::after { background: rgba(255,77,93,.12); }

.summary-title {
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1.1px;
}

.summary-card strong {
    display: block;
    font-size: 38px;
    margin-top: 8px;
    line-height: 1;
}

.summary-card small {
    display: block;
    color: var(--muted);
    margin-top: 8px;
}

.panel {
    border: 1px solid var(--border);
    border-radius: 22px;
    background: linear-gradient(160deg, rgba(255,255,255,.025), rgba(255,255,255,0)), var(--panel);
    overflow: hidden;
    margin-bottom: 18px;
}

.panel-heading {
    padding: 20px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    border-bottom: 1px solid var(--border);
}

.panel-heading h2 {
    font-size: 17px;
}

.panel-heading p {
    color: var(--muted);
    font-size: 12px;
    margin-top: 5px;
}

.legend {
    display: flex;
    gap: 18px;
    color: var(--muted);
    font-size: 11px;
}

.legend span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot.ok { background: var(--green); }
.dot.warning { background: var(--yellow); }
.dot.down { background: var(--red); }

.topology {
    height: 760px;
    position: relative;
    overflow: auto;
    background:
        linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
    background-size: 34px 34px;
}

#topology-lines {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.topology-line {
    stroke-width: .7;
    vector-effect: non-scaling-stroke;
}

.topology-line.ok { stroke: var(--green); }
.topology-line.warning { stroke: var(--yellow); }
.topology-line.down { stroke: var(--red); }
.topology-line.unknown,
.topology-line.stale { stroke: var(--gray); }

.topology-node {
    width: 250px;
    min-height: 120px;
    padding: 12px 12px 10px;
    border: 1px solid var(--border);
    border-radius: 15px;
    background: rgba(15,28,45,.97);
    position: absolute;
    z-index: 2;
    transform: translate(-50%, -50%);
    box-shadow: 0 10px 25px rgba(0,0,0,.20);
}

.topology-node::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 12px;
    bottom: 12px;
    width: 3px;
    border-radius: 4px;
}

.topology-node.ok::before { background: var(--green); }
.topology-node.warning::before { background: var(--yellow); }
.topology-node.down::before { background: var(--red); }
.topology-node.unknown::before,
.topology-node.stale::before { background: var(--gray); }

.node-title {
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 10px;
}

.node-ports {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.node-port {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
    align-items: center;
    font-size: 10px;
    padding: 6px 8px;
    border-radius: 10px;
    background: rgba(255,255,255,.03);
}

.node-port-dest {
    color: #dfe7f2;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.node-port-rx {
    color: #ffb36e;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.node-port-tx {
    color: #71bbff;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.node-empty {
    color: var(--muted);
    font-size: 11px;
    padding: 8px 0;
}

.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.two-columns .panel {
    margin-bottom: 0;
}

.problems,
.quick-links {
    padding: 12px;
    min-height: 140px;
}

.problem {
    padding: 13px 14px;
    border-radius: 14px;
    background: rgba(255,77,93,.075);
    border: 1px solid rgba(255,77,93,.17);
    margin-bottom: 8px;
}

.problem:last-child {
    margin-bottom: 0;
}

.problem-title {
    font-weight: 700;
    font-size: 12px;
}

.problem-meta {
    color: var(--muted);
    font-size: 10px;
    margin-top: 5px;
}

.empty {
    color: var(--muted);
    font-size: 12px;
    padding: 20px 10px;
    text-align: center;
}

.quick-link-card {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: rgba(255,255,255,.018);
    margin-bottom: 10px;
}

.quick-link-card:last-child {
    margin-bottom: 0;
}

.quick-link-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.quick-link-name {
    font-size: 12px;
    font-weight: 700;
}

.quick-side {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    align-items: center;
    font-size: 10px;
    padding: 6px 0;
    border-top: 1px solid var(--border);
}

.quick-side-name {
    color: var(--muted);
}

.quick-side-rx {
    color: #ffb36e;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.quick-side-tx {
    color: #71bbff;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 8px;
    border-radius: 999px;
    font-size: 9px;
    font-weight: 800;
    letter-spacing: .5px;
}

.status-pill.ok {
    color: #64e8a6;
    background: rgba(40,209,124,.09);
}

.status-pill.warning {
    color: #ffd36f;
    background: rgba(255,191,56,.10);
}

.status-pill.down {
    color: #ff8190;
    background: rgba(255,77,93,.11);
}

.status-pill.unknown,
.status-pill.stale {
    color: #aab6c7;
    background: rgba(115,132,155,.12);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 12px;
    padding: 14px;
}

.link-card {
    border: 1px solid var(--border);
    border-radius: 17px;
    background: rgba(255,255,255,.018);
    padding: 15px;
    cursor: pointer;
    transition: transform .16s ease, border-color .16s ease, background .16s ease;
}

.link-card:hover {
    transform: translateY(-2px);
    border-color: rgba(31,143,255,.35);
    background: rgba(31,143,255,.035);
}

.link-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.link-name {
    font-weight: 700;
    font-size: 12px;
}

.side {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    align-items: center;
    padding: 8px 0;
    border-top: 1px solid var(--border);
    font-size: 10px;
}

.side-name {
    color: var(--muted);
}

.rx {
    color: #ffad62;
    font-variant-numeric: tabular-nums;
}

.tx {
    color: #70baff;
    font-variant-numeric: tabular-nums;
}

.refresh-btn,
.range-buttons button {
    border: 1px solid var(--border);
    background: rgba(255,255,255,.03);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
}

.refresh-btn:hover,
.range-buttons button:hover,
.range-buttons button.active {
    border-color: rgba(31,143,255,.45);
    background: rgba(31,143,255,.10);
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 25px;
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(2,7,14,.82);
    backdrop-filter: blur(7px);
}

.modal-box {
    position: relative;
    z-index: 2;
    width: min(1000px, 96vw);
    max-height: 92vh;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 23px;
    background: #0d1827;
    box-shadow: 0 30px 100px rgba(0,0,0,.55);
}

.modal-header {
    padding: 21px 23px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.eyebrow {
    color: var(--orange);
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 1.4px;
}

.modal-header h2 {
    margin-top: 5px;
    font-size: 18px;
}

.close-btn {
    border: 0;
    background: transparent;
    color: white;
    font-size: 30px;
    cursor: pointer;
}

.range-buttons {
    padding: 14px 22px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.chart-block {
    padding: 20px 22px;
    border-bottom: 1px solid var(--border);
}

.chart-block:last-child {
    border-bottom: 0;
}

.chart-title {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
}

.chart-title strong {
    font-size: 12px;
}

.chart-values {
    color: var(--muted);
    font-size: 10px;
}

.canvas-wrap {
    height: 270px;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.loading {
    color: var(--muted);
    padding: 40px;
    text-align: center;
}

@media (max-width: 1200px) {
    .links-grid {
        grid-template-columns: repeat(2, minmax(0,1fr));
    }

    .summary-grid {
        grid-template-columns: repeat(2, minmax(0,1fr));
    }

    .two-columns {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 800px) {
    .topology {
        height: 1000px;
    }

    .topology-node {
        width: 220px;
    }

    .legend {
        display: none;
    }

    .links-grid {
        grid-template-columns: 1fr;
    }
}