:root[data-theme="dark"] {
    --bg-main: #0b1120;
    --bg-card: #151f32;
    --bg-hover: #1e293b;
    --text-primary: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #26354d;
    --accent: #38bdf8;
    --up: #22c55e;
    --down: #ef4444;
    --trouble: #f59e0b;
}

:root[data-theme="light"] {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-hover: #e2e8f0;
    --text-primary: #0f172a;
    --text-muted: #475569;
    --border-color: #cbd5e1;
    --accent: #0284c7;
    --up: #16a34a;
    --down: #dc2626;
    --trouble: #d97706;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    padding-bottom: 52px;
    min-height: 100vh;
    overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }

/* Navbar */
.top-navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 0.65rem 1.25rem;
    min-height: 59px;
    position: sticky;
    top: 0;
    z-index: 100;
}
.brand-wrap { display: flex; align-items: center; gap: 0.75rem; }
.nav-logo { width: 38px; height: 38px; }
.brand-title { font-weight: 800; font-size: 0.95rem; letter-spacing: 0.04em; color: var(--accent); }
.brand-sub { font-size: 0.72rem; color: var(--text-muted); font-weight: 600; }
.main-nav { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.main-nav a {
    color: var(--text-primary);
    padding: 0.45rem 0.85rem;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 600;
}
.main-nav a.active, .main-nav a:hover {
    background: var(--accent);
    color: #fff;
}
.nav-actions { display: flex; align-items: center; gap: 0.6rem; }
.user-pill { font-size: 0.82rem; color: var(--text-muted); padding: 0 0.4rem; }

.main-container { padding: 1.25rem; max-width: 1680px; margin: 0 auto; }

/* Section Headers & Kebab */
.section-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.85rem;
    position: relative;
}
.section-title { font-size: 1.05rem; font-weight: 700; letter-spacing: 0.02em; }
.kebab-wrap { position: relative; }
.kebab-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
}
.kebab-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 38px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.65rem;
    min-width: 215px;
    z-index: 90;
    box-shadow: 0 10px 25px rgba(0,0,0,0.4);
}
.kebab-dropdown.open { display: block; }
.kebab-dropdown label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.25rem;
    font-size: 0.84rem;
    cursor: pointer;
}

/* 1. Summary Metrics Grid - Dynamic & Equal Size Cards */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    grid-auto-rows: 155px;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    height: 155px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.15s ease, border-color 0.15s ease;
    overflow: hidden;
}
.metric-card.clickable { cursor: pointer; }
.metric-card.clickable:hover { transform: translateY(-2px); border-color: var(--accent); }
.metric-label { font-size: 0.78rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; }
.metric-value { font-size: 2.2rem; font-weight: 800; }
.metric-foot { font-size: 0.78rem; color: var(--text-muted); }

/* Treemap inside equal-sized Device Status Metric Card */
.treemap-box {
    display: flex;
    width: 100%;
    height: 92px;
    border-radius: 6px;
    overflow: hidden;
    font-weight: 700;
    font-size: 0.78rem;
    color: #fff;
}
.treemap-up { background: var(--up); display: flex; align-items: center; justify-content: center; text-align: center; padding: 4px; }
.treemap-down { background: var(--down); display: flex; align-items: center; justify-content: center; text-align: center; padding: 4px; }

/* 3. Devices Availability Multi-Column Box Grid */
.avail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
    gap: 0.85rem;
    margin-top: 0.75rem;
}
.device-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-left: 5px solid var(--up);
    border-radius: 8px;
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}
.device-box.status-DOWN { border-left-color: var(--down); }
.device-box.status-TROUBLE { border-left-color: var(--trouble); }
.dev-box-head { display: flex; justify-content: space-between; align-items: center; gap: 0.4rem; }
.dev-box-name { font-weight: 700; font-size: 0.95rem; color: var(--text-primary); }
.dev-box-name:hover { color: var(--accent); text-decoration: underline; }
.dev-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; justify-content: space-between; }

/* Status Badges */
.badge {
    padding: 0.18rem 0.5rem;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 800;
    color: #fff;
    display: inline-block;
}
.badge-UP, .badge-RECOVERY { background: var(--up); }
.badge-DOWN, .badge-CRITICAL { background: var(--down); }
.badge-TROUBLE, .badge-WARNING { background: var(--trouble); }

/* Single Scrollbar Sticky Header Tables */
.card-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1.5rem;
}
.table-scroll {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: visible;
}
table.noc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.86rem;
}
table.noc-table thead th {
    position: sticky;
    top: 59px;
    background: var(--bg-hover);
    color: var(--text-primary);
    text-align: left;
    padding: 0.75rem;
    font-weight: 700;
    border-bottom: 2px solid var(--border-color);
    z-index: 20;
}
table.noc-table tbody td {
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
}
table.noc-table tbody tr:hover { background: var(--bg-hover); }

/* Buttons & Inputs */
.btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.5rem 0.95rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}
.btn-sm { padding: 0.32rem 0.65rem; font-size: 0.78rem; }
.btn-danger { background: var(--down); }
.btn-secondary { background: var(--bg-hover); color: var(--text-primary); border: 1px solid var(--border-color); }
input, select, textarea {
    background: var(--bg-main);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem 0.7rem;
    font-size: 0.86rem;
}
.toolbar { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: space-between; align-items: center; margin-bottom: 0.85rem; }

/* Pagination */
.pagination { display: flex; justify-content: space-between; align-items: center; padding-top: 0.85rem; flex-wrap: wrap; gap: 0.5rem; }
.page-info { font-size: 0.82rem; color: var(--text-muted); }
.page-links { display: flex; gap: 0.35rem; }
.btn-page {
    padding: 0.35rem 0.7rem;
    background: var(--bg-hover);
    color: var(--text-primary);
    border-radius: 5px;
    font-size: 0.82rem;
    border: 1px solid var(--border-color);
}
.btn-page.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Uptime Bar (24h) */
.uptime-bar { display: flex; gap: 3px; height: 34px; width: 100%; margin: 0.65rem 0; }
.uptime-slot { flex: 1; border-radius: 3px; cursor: pointer; }

/* Modals */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.68);
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.modal-backdrop.open { display: flex; }
.modal-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    width: 100%;
    max-width: 680px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 1.25rem;
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-bottom: 0.75rem; }
.form-group { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 0.65rem; }
.form-group label { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }

/* Sticky Left-Aligned Footer */
.sticky-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 0.65rem 1.25rem;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    z-index: 100;
}

/* Login Page */
.login-wrapper {
    min-height: calc(100vh - 55px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}
.login-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.25rem 2rem;
    width: 100%;
    max-width: 410px;
    text-align: center;
}