:root {
    --bg-main: #07111c;
    --bg-secondary: #0a1724;
    --panel: rgba(14, 30, 47, 0.92);
    --panel-light: rgba(20, 40, 60, 0.88);

    --blue: #238fc8;
    --blue-bright: #2da9e0;
    --blue-deep: #0a5d90;

    --green: #36d399;
    --red: #f15b6c;
    --amber: #f2b94b;
    --grey: #8294a7;

    --text-main: #f7fbff;
    --text-muted: #8fa4b8;
    --text-soft: #b7c7d5;

    --border: rgba(76, 163, 212, 0.16);
    --border-soft: rgba(255,255,255,0.055);

    --sidebar-bg-1: rgba(8,20,33,.98);
    --sidebar-bg-2: rgba(7,16,27,.98);

    --topbar-bg: rgba(7,17,28,.72);

    --input-bg: rgba(6,18,30,.72);

    --button-secondary-bg: #1b2d3f;

    --shadow:
        0 20px 60px rgba(0,0,0,.25);
}


/* ======================================================
   Light Theme
   ====================================================== */

html[data-theme="light"] {
    --bg-main: #f3f7fa;
    --bg-secondary: #edf3f7;

    --panel: rgba(255,255,255,.96);
    --panel-light: rgba(247,250,252,.98);

    --blue: #238fc8;
    --blue-bright: #168fc9;
    --blue-deep: #0a679d;

    --green: #159b69;
    --red: #d64256;
    --amber: #c78714;
    --grey: #738494;

    --text-main: #152535;
    --text-muted: #687b8c;
    --text-soft: #41586a;

    --border: rgba(35,143,200,.18);
    --border-soft: rgba(22,43,61,.09);

    --sidebar-bg-1: rgba(255,255,255,.99);
    --sidebar-bg-2: rgba(247,250,252,.99);

    --topbar-bg: rgba(255,255,255,.82);

    --input-bg: #ffffff;

    --button-secondary-bg: #e7eef3;

    --shadow:
        0 16px 45px rgba(30,57,76,.10);
}


/* ======================================================
   Core
   ====================================================== */

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

html {
    background: var(--bg-main);
}

body {
    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Arial,
        sans-serif;

    color: var(--text-main);

    background:
        radial-gradient(
            circle at 70% 0%,
            rgba(35,143,200,.10),
            transparent 35%
        ),
        linear-gradient(
            145deg,
            var(--bg-main) 0%,
            var(--bg-secondary) 48%,
            var(--bg-main) 100%
        );

    transition:
        background .25s ease,
        color .25s ease;
}

a {
    color: inherit;
}

.app-shell {
    min-height: 100vh;
    display: flex;
}


/* ======================================================
   Sidebar
   ====================================================== */

.sidebar {
    width: 255px;

    position: fixed;
    inset: 0 auto 0 0;

    background:
        linear-gradient(
            180deg,
            var(--sidebar-bg-1),
            var(--sidebar-bg-2)
        );

    border-right:
        1px solid var(--border-soft);

    display: flex;
    flex-direction: column;

    z-index: 50;

    transition:
        background .25s ease,
        border-color .25s ease;
}

.sidebar-brand {
    height: 94px;

    display: flex;
    align-items: center;

    padding: 20px 25px;

    border-bottom:
        1px solid var(--border-soft);
}

.sidebar-brand img {
    display: block;

    width: 180px;
    max-width: 100%;

    height: auto;
    max-height: 55px;

    object-fit: contain;
}

.sidebar-label {
    padding:
        24px 20px 9px;

    color: var(--text-muted);

    font-size: 11px;
    font-weight: 800;

    text-transform: uppercase;

    letter-spacing: .15em;
}

.nav {
    padding: 0 12px;
}

.nav-item {
    display: flex;
    align-items: center;

    gap: 13px;

    padding: 12px 14px;

    margin-bottom: 4px;

    color: var(--text-muted);

    text-decoration: none;

    border-radius: 10px;

    font-size: 14px;
    font-weight: 650;

    transition:
        background .15s ease,
        color .15s ease,
        transform .15s ease;
}

.nav-item:hover {
    background:
        rgba(35,143,200,.08);

    color: var(--text-main);
}

.nav-item.active {
    color: var(--text-main);

    background:
        linear-gradient(
            90deg,
            rgba(35,143,200,.20),
            rgba(35,143,200,.06)
        );

    border:
        1px solid rgba(35,143,200,.18);
}

.nav-icon {
    width: 20px;

    color: var(--blue-bright);

    font-size: 17px;

    text-align: center;
}

.sidebar-footer {
    margin-top: auto;

    padding: 18px;

    border-top:
        1px solid var(--border-soft);
}

.sidebar-user {
    padding: 11px 12px;

    background:
        rgba(35,143,200,.045);

    border-radius: 10px;
}

.sidebar-user-name {
    font-size: 14px;
    font-weight: 700;
}

.sidebar-user-sub {
    margin-top: 3px;

    color: var(--text-muted);

    font-size: 12px;
}


/* ======================================================
   Main Area
   ====================================================== */

.main {
    width: calc(100% - 255px);

    margin-left: 255px;
}

.topbar {
    min-height: 76px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 12px 32px;

    border-bottom:
        1px solid var(--border-soft);

    background: var(--topbar-bg);

    backdrop-filter: blur(18px);

    position: sticky;
    top: 0;

    z-index: 40;

    transition:
        background .25s ease,
        border-color .25s ease;
}

.topbar-title {
    font-size: 15px;
    font-weight: 700;

    color: var(--text-main);
}

.topbar-actions {
    display: flex;
    align-items: center;

    gap: 10px;
}

.main-content {
    padding: 30px 32px 50px;

    max-width: 1700px;

    margin: 0 auto;
}


/* ======================================================
   Theme Toggle
   ====================================================== */

.theme-toggle {
    width: 42px;
    height: 42px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    padding: 0;

    border-radius: 10px;

    border:
        1px solid var(--border-soft);

    background:
        rgba(35,143,200,.06);

    color: var(--text-main);

    font-size: 19px;

    cursor: pointer;

    box-shadow: none;

    transition:
        background .15s ease,
        transform .15s ease,
        border-color .15s ease;
}

.theme-toggle:hover {
    background:
        rgba(35,143,200,.12);

    transform:
        translateY(-1px);
}


/* ======================================================
   Headings
   ====================================================== */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;

    gap: 20px;

    margin-bottom: 27px;
}

.page-title {
    margin: 0;

    font-size: 29px;
    font-weight: 760;

    letter-spacing: -.025em;
}

.page-subtitle {
    margin-top: 7px;

    color: var(--text-muted);

    font-size: 14px;
}


/* ======================================================
   Buttons
   ====================================================== */

.button {
    appearance: none;

    border: 0;

    border-radius: 9px;

    padding: 11px 17px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    gap: 8px;

    cursor: pointer;

    text-decoration: none;

    font-size: 13px;
    font-weight: 750;

    color: white;

    background:
        linear-gradient(
            135deg,
            var(--blue-deep),
            var(--blue-bright)
        );

    box-shadow:
        0 8px 22px rgba(35,143,200,.16);

    transition:
        transform .15s ease,
        box-shadow .15s ease,
        opacity .15s ease;
}

.button:hover {
    transform: translateY(-1px);

    box-shadow:
        0 12px 28px rgba(35,143,200,.22);
}

.button-secondary {
    background: var(--button-secondary-bg);

    color: var(--text-main);

    box-shadow: none;

    border:
        1px solid var(--border-soft);
}

.button-danger {
    background:
        rgba(190,60,75,.20);

    color: var(--red);

    border:
        1px solid rgba(241,91,108,.25);

    box-shadow: none;
}

.button-small {
    padding: 8px 11px;

    font-size: 12px;
}


/* ======================================================
   Summary Cards
   ====================================================== */

.summary-grid {
    display: grid;

    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 16px;

    margin-bottom: 24px;
}

.summary-card {
    position: relative;

    overflow: hidden;

    padding: 21px;

    min-height: 132px;

    border-radius: 14px;

    border:
        1px solid var(--border-soft);

    background: var(--panel);

    box-shadow:
        0 12px 35px rgba(0,0,0,.08);

    transition:
        background .25s ease,
        border-color .25s ease;
}

.summary-card::after {
    content: "";

    position: absolute;

    width: 110px;
    height: 110px;

    right: -40px;
    top: -35px;

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(45,169,224,.11),
            transparent 68%
        );
}

.summary-label {
    color: var(--text-muted);

    font-size: 12px;
    font-weight: 750;

    letter-spacing: .06em;

    text-transform: uppercase;
}

.summary-value {
    margin-top: 11px;

    font-size: 35px;
    font-weight: 780;

    letter-spacing: -.025em;
}

.summary-meta {
    margin-top: 4px;

    color: var(--text-muted);

    font-size: 12px;
}

.value-green {
    color: var(--green);
}

.value-red {
    color: var(--red);
}

.value-blue {
    color: var(--blue-bright);
}

.value-amber {
    color: var(--amber);
}


/* ======================================================
   Panels
   ====================================================== */

.panel {
    background: var(--panel);

    border:
        1px solid var(--border-soft);

    border-radius: 14px;

    box-shadow: var(--shadow);

    transition:
        background .25s ease,
        border-color .25s ease;
}

.panel-header {
    padding: 19px 21px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 15px;

    border-bottom:
        1px solid var(--border-soft);
}

.panel-title {
    font-size: 15px;
    font-weight: 750;
}

.panel-subtitle {
    margin-top: 4px;

    color: var(--text-muted);

    font-size: 12px;
}

.panel-body {
    padding: 21px;
}


/* ======================================================
   Status / client list
   ====================================================== */

.system-list {
    overflow: hidden;
}

.system-row {
    display: grid;

    grid-template-columns:
        minmax(220px, 2fr)
        minmax(145px, 1fr)
        110px
        130px
        110px;

    gap: 15px;

    align-items: center;

    padding: 16px 20px;

    border-bottom:
        1px solid var(--border-soft);

    transition:
        background .15s ease;
}

.system-row:last-child {
    border-bottom: 0;
}

.system-row:hover {
    background:
        rgba(35,143,200,.025);
}

.system-name-wrap {
    display: flex;
    align-items: center;

    gap: 12px;

    min-width: 0;
}

.status-dot {
    width: 10px;
    height: 10px;

    flex: 0 0 auto;

    border-radius: 50%;
}

.status-up {
    background: var(--green);

    box-shadow:
        0 0 0 4px rgba(54,211,153,.09),
        0 0 15px rgba(54,211,153,.22);
}

.status-down {
    background: var(--red);

    box-shadow:
        0 0 0 4px rgba(241,91,108,.09),
        0 0 15px rgba(241,91,108,.22);
}

.status-pending {
    background: var(--amber);

    box-shadow:
        0 0 0 4px rgba(242,185,75,.09);
}

.status-unknown {
    background: var(--grey);
}

.system-name {
    font-size: 14px;
    font-weight: 750;

    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.system-description {
    margin-top: 3px;

    color: var(--text-muted);

    font-size: 12px;

    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.system-target {
    color: var(--text-soft);

    font-family:
        "SFMono-Regular",
        Consolas,
        monospace;

    font-size: 12px;
}

.metric {
    font-size: 13px;
    font-weight: 700;
}

.metric-muted {
    color: var(--text-muted);

    font-size: 12px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    min-width: 67px;

    padding: 6px 9px;

    border-radius: 999px;

    font-size: 11px;
    font-weight: 800;

    letter-spacing: .05em;
}

.badge-up {
    color: var(--green);

    background:
        rgba(54,211,153,.09);

    border:
        1px solid rgba(54,211,153,.18);
}

.badge-down {
    color: var(--red);

    background:
        rgba(241,91,108,.10);

    border:
        1px solid rgba(241,91,108,.18);
}

.badge-pending {
    color: var(--amber);

    background:
        rgba(242,185,75,.09);

    border:
        1px solid rgba(242,185,75,.18);
}

.badge-unknown {
    color: var(--grey);

    background:
        rgba(140,160,180,.07);

    border:
        1px solid rgba(140,160,180,.15);
}


/* ======================================================
   Forms
   ====================================================== */

.form-grid {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 17px 20px;
}

.form-group label {
    display: block;

    margin-bottom: 7px;

    color: var(--text-soft);

    font-size: 12px;
    font-weight: 750;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;

    padding: 12px 13px;

    border:
        1px solid var(--border-soft);

    border-radius: 9px;

    outline: none;

    color: var(--text-main);

    background: var(--input-bg);

    font: inherit;

    transition:
        border .15s ease,
        box-shadow .15s ease,
        background .25s ease,
        color .25s ease;
}

.form-group textarea {
    min-height: 90px;

    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color:
        rgba(45,169,224,.68);

    box-shadow:
        0 0 0 3px
        rgba(45,169,224,.08);
}

.form-full {
    grid-column: 1 / -1;
}

.form-help {
    margin-top: 6px;

    color: var(--text-muted);

    font-size: 11px;
}

.checkbox-row {
    display: flex;
    align-items: center;

    gap: 9px;

    margin-top: 10px;
}

.checkbox-row input {
    width: auto;
}


/* ======================================================
   Tables
   ====================================================== */

table {
    width: 100%;

    border-collapse: collapse;
}

th,
td {
    text-align: left;

    padding: 12px 10px;

    border-bottom:
        1px solid var(--border-soft);
}

th {
    color: var(--text-muted);

    font-size: 12px;
}

td {
    color: var(--text-main);
}


/* ======================================================
   Empty State
   ====================================================== */

.empty-state {
    padding: 58px 25px;

    text-align: center;
}

.empty-icon {
    font-size: 35px;

    margin-bottom: 15px;
}

.empty-title {
    font-size: 17px;
    font-weight: 750;
}

.empty-text {
    margin-top: 6px;

    color: var(--text-muted);

    font-size: 13px;
}


/* ======================================================
   Responsive
   ====================================================== */

.mobile-nav {
    display: none;
}

@media (max-width: 1050px) {

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

    .system-row {
        grid-template-columns:
            minmax(190px, 2fr)
            minmax(130px, 1fr)
            90px
            100px;
    }

    .hide-tablet {
        display: none;
    }
}

@media (max-width: 760px) {

    .sidebar {
        display: none;
    }

    .main {
        width: 100%;
        margin-left: 0;
    }

    .topbar {
        height: auto;

        min-height: 68px;

        padding: 13px 16px;
    }

    .main-content {
        padding: 22px 15px 40px;
    }

    .page-header {
        flex-direction: column;
    }

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

        gap: 11px;
    }

    .summary-card {
        min-height: 115px;

        padding: 16px;
    }

    .summary-value {
        font-size: 28px;
    }

    .system-row {
        display: block;

        padding: 17px;
    }

    .system-target {
        margin-top: 11px;
    }

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

    .form-full {
        grid-column: auto;
    }
}

@media (max-width: 430px) {

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

    .summary-label {
        font-size: 10px;
    }

    .summary-value {
        font-size: 25px;
    }
}