/* ─────────────────────────────────────────────────────────────────────────
   ESSL Admin — Design system
   Aesthetic: utilitarian editorial. Industrial monitoring tool.
   Type pair: IBM Plex Sans (body) + IBM Plex Mono (data/IDs)
   Loaded from Google Fonts in _Layout.cshtml.
   ───────────────────────────────────────────────────────────────────────── */

:root {
    /* Palette — paper / ink / signal */
    --paper:        #f5f3ee;          /* warm off-white */
    --paper-deep:   #ebe7df;
    --ink:          #1a1d23;          /* near-black slate */
    --ink-soft:     #3b4049;
    --ink-faint:    #6b7079;
    --rule:         #d9d4c7;          /* hairline divider */
    --rule-soft:    #e8e3d6;

    --signal:       #c54b1a;          /* burnt orange — primary action / warnings */
    --signal-deep:  #9c3a13;
    --signal-soft:  #fbe5d8;

    --ok:           #2d6a3e;          /* online / success */
    --ok-soft:      #d8ead5;
    --warn:         #b8860b;          /* offline / caution */
    --warn-soft:    #f4ead0;
    --danger:       #a4231e;
    --danger-soft:  #f4d6d4;

    /* Geometry */
    --radius:       2px;              /* sharp corners — industrial */
    --radius-card:  4px;
    --gutter:       1.5rem;
    --shadow-card:  0 1px 0 var(--rule), 0 4px 16px -10px rgba(26,29,35,.15);

    /* Type */
    --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
    --font-serif: "IBM Plex Serif", "Georgia", serif;
}

* { box-sizing: border-box; }

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

body {
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--ink);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

code, .mono, .num {
    font-family: var(--font-mono);
    font-feature-settings: "tnum" 1, "lnum" 1;
}

/* ─── Topbar ───────────────────────────────────────────────────────────── */
.topbar {
    background: var(--ink);
    color: var(--paper);
    border-bottom: 3px solid var(--signal);
    padding: 0 var(--gutter);
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.topbar .brand {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}
.topbar .brand .mark {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background: var(--signal);
    color: var(--paper);
    padding: 2px 6px;
    border-radius: var(--radius);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-weight: 500;
}
.topbar .brand .sub {
    color: var(--ink-faint);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    margin-left: 0.5rem;
    font-weight: normal;
}

.topbar .user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
}
.topbar .user-menu .who {
    font-family: var(--font-mono);
    color: var(--paper-deep);
}
.topbar .user-menu .who .role {
    color: var(--signal-soft);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-left: 0.4rem;
}
.topbar .user-menu .logout {
    color: var(--paper-deep);
    background: transparent;
    border: 1px solid var(--ink-soft);
    padding: 0.35rem 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    border-radius: var(--radius);
    transition: all 0.15s;
}
.topbar .user-menu .logout:hover {
    background: var(--signal);
    border-color: var(--signal);
    color: var(--paper);
}

/* ─── Page shell ───────────────────────────────────────────────────────── */
.shell {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: calc(100vh - 56px);
}
.sidebar {
    background: var(--paper-deep);
    border-right: 1px solid var(--rule);
    padding: 1.5rem 0;
}
.sidebar .section {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-faint);
    padding: 0.5rem 1.5rem;
    margin-top: 0.5rem;
}
.sidebar nav a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 1.5rem;
    color: var(--ink);
    font-size: 0.9rem;
    border-left: 3px solid transparent;
    transition: all 0.1s;
}
.sidebar nav a:hover { background: var(--paper); text-decoration: none; }
.sidebar nav a.active {
    background: var(--paper);
    border-left-color: var(--signal);
    font-weight: 500;
}
.sidebar nav a .icon {
    width: 14px;
    text-align: center;
    color: var(--ink-faint);
    font-family: var(--font-mono);
}

/* ─── Main content ──────────────────────────────────────────────────────── */
.main {
    padding: 2rem 2.25rem;
    max-width: 1400px;
    width: 100%;
}
.page-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 1.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--rule);
}
.page-head h1 {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.8rem;
    margin: 0;
    letter-spacing: -0.02em;
}
.page-head .meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--ink-faint);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* ─── Cards / KPIs ─────────────────────────────────────────────────────── */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.kpi {
    background: #fff;
    border: 1px solid var(--rule);
    border-radius: var(--radius-card);
    padding: 1.1rem 1.25rem;
    position: relative;
    overflow: hidden;
}
.kpi::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--signal);
}
.kpi.ok::before    { background: var(--ok); }
.kpi.warn::before  { background: var(--warn); }
.kpi.muted::before { background: var(--ink-faint); }

.kpi .label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-faint);
    margin-bottom: 0.4rem;
}
.kpi .value {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.1;
}
.kpi .sub {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--ink-faint);
    margin-top: 0.3rem;
}

/* ─── Section / panel ───────────────────────────────────────────────────── */
.panel {
    background: #fff;
    border: 1px solid var(--rule);
    border-radius: var(--radius-card);
    margin-bottom: 1.5rem;
}
.panel-head {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--rule);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.panel-head h2 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: -0.01em;
}
.panel-head .actions { display: flex; gap: 0.5rem; }
.panel-body { padding: 1.25rem; }
.panel-body.flush { padding: 0; }

/* ─── Tables ───────────────────────────────────────────────────────────── */
table.data {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}
table.data thead th {
    text-align: left;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-faint);
    padding: 0.8rem 1.25rem;
    border-bottom: 1px solid var(--rule);
    background: var(--paper);
    font-weight: 600;
    white-space: nowrap;
}
table.data tbody td {
    padding: 0.7rem 1.25rem;
    border-bottom: 1px solid var(--rule-soft);
    vertical-align: middle;
}
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: var(--paper); }
table.data .num { text-align: right; }
table.data .mono { font-family: var(--font-mono); font-size: 0.83rem; }
table.data .ellipsis {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ─── Status pills ──────────────────────────────────────────────────────── */
.pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
}
.pill::before {
    content: "";
    width: 6px; height: 6px;
    border-radius: 50%;
    background: currentColor;
}
.pill.online  { background: var(--ok-soft);     color: var(--ok); }
.pill.offline { background: var(--warn-soft);   color: var(--warn); }
.pill.unknown { background: var(--rule-soft);   color: var(--ink-faint); }
.pill.danger  { background: var(--danger-soft); color: var(--danger); }
.pill.active  { background: var(--ok-soft);     color: var(--ok); }
.pill.inactive{ background: var(--rule-soft);   color: var(--ink-faint); }

/* ─── Buttons ──────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.9rem;
    border: 1px solid var(--ink);
    background: var(--ink);
    color: var(--paper);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    cursor: pointer;
    border-radius: var(--radius);
    transition: all 0.12s;
    text-decoration: none !important;
}
.btn:hover { background: var(--signal); border-color: var(--signal); color: var(--paper); }
.btn.ghost {
    background: transparent;
    color: var(--ink);
}
.btn.ghost:hover { background: var(--ink); color: var(--paper); }
.btn.danger {
    background: var(--danger);
    border-color: var(--danger);
}
.btn.danger:hover { background: var(--signal-deep); border-color: var(--signal-deep); }
.btn.sm { padding: 0.25rem 0.55rem; font-size: 0.7rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─── Forms ────────────────────────────────────────────────────────────── */
.form-row { margin-bottom: 1rem; }
.form-row label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-faint);
    margin-bottom: 0.35rem;
}
.form-row input,
.form-row select,
.form-row textarea {
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 1px solid var(--rule);
    background: #fff;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    border-radius: var(--radius);
    transition: border 0.12s;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    outline: none;
    border-color: var(--ink);
}
.form-row input.mono { font-family: var(--font-mono); }
.form-row .hint {
    font-size: 0.75rem;
    color: var(--ink-faint);
    margin-top: 0.3rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1.25rem;
}

/* ─── Toasts / alerts ──────────────────────────────────────────────────── */
.alert {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-left: 3px solid currentColor;
    background: var(--rule-soft);
    font-size: 0.875rem;
    border-radius: var(--radius);
}
.alert.error   { background: var(--danger-soft); color: var(--danger); }
.alert.success { background: var(--ok-soft);     color: var(--ok); }
.alert.warn    { background: var(--warn-soft);   color: var(--warn); }

/* ─── Login screen ─────────────────────────────────────────────────────── */
body.login {
    background: var(--ink);
    color: var(--paper);
    display: flex;
    align-items: center;
    justify-content: center;
    background-image:
        repeating-linear-gradient(135deg,
            transparent 0,
            transparent 60px,
            rgba(245,243,238,0.015) 60px,
            rgba(245,243,238,0.015) 120px);
}
.login-card {
    background: var(--paper);
    color: var(--ink);
    border-radius: var(--radius-card);
    padding: 2.5rem 2.25rem;
    width: 380px;
    box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
    border-top: 3px solid var(--signal);
    position: relative;
}
.login-card::before {
    content: "ADMS · v2.4";
    position: absolute;
    top: -3px; right: 0;
    background: var(--signal);
    color: var(--paper);
    padding: 4px 10px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    border-bottom-left-radius: var(--radius);
    text-transform: uppercase;
    font-weight: 500;
}
.login-card .header {
    margin-bottom: 1.75rem;
}
.login-card .header .tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--ink-faint);
    margin-bottom: 0.4rem;
}
.login-card .header h1 {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.7rem;
    margin: 0;
    letter-spacing: -0.02em;
    line-height: 1.15;
}
.login-card .header .sub {
    font-size: 0.85rem;
    color: var(--ink-faint);
    margin-top: 0.5rem;
}
.login-card .footer {
    margin-top: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-faint);
    text-align: center;
    letter-spacing: 0.06em;
}
.login-card .btn {
    width: 100%;
    justify-content: center;
    padding: 0.65rem;
    font-size: 0.85rem;
}

/* ─── Modal ────────────────────────────────────────────────────────────── */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(26,29,35,0.55);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-backdrop.open { display: flex; }
.modal {
    background: var(--paper);
    border-radius: var(--radius-card);
    width: 460px;
    max-width: 92vw;
    max-height: 90vh;
    overflow-y: auto;
    border-top: 3px solid var(--signal);
    box-shadow: 0 30px 80px -20px rgba(0,0,0,0.4);
}
.modal-head {
    padding: 1.2rem 1.5rem 0.5rem;
}
.modal-head h2 {
    font-family: var(--font-serif);
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}
.modal-body { padding: 1rem 1.5rem; }
.modal-foot {
    padding: 0.9rem 1.5rem;
    border-top: 1px solid var(--rule);
    display: flex;
    gap: 0.6rem;
    justify-content: flex-end;
}

/* ─── Utilities ────────────────────────────────────────────────────────── */
.row { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.row > * { flex: 0 0 auto; }
.right { margin-left: auto; }
.muted { color: var(--ink-faint); }
.empty {
    padding: 2.5rem 1rem;
    text-align: center;
    color: var(--ink-faint);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}
.spacer { height: 1rem; }

.filters {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    padding: 1rem 1.25rem;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    flex-wrap: wrap;
}
.filters .form-row { margin: 0; }
.filters input, .filters select { padding: 0.4rem 0.6rem; font-size: 0.85rem; }

.pagination {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--rule);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-faint);
}
.pagination .right { margin-left: auto; display: flex; gap: 0.4rem; }

/* ─── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 800px) {
    .shell { grid-template-columns: 1fr; }
    .sidebar { display: none; }
    .main { padding: 1.25rem; }
    .form-grid { grid-template-columns: 1fr; }
}