:root {
    --bg: #0f141c;
    --panel: #1a2330;
    --panel-2: #16202c;
    --panel-3: #111923;
    --line: #2f4359;
    --line-light: #3a5570;
    --text: #d7e3ee;
    --text-dim: #91a7bc;
    --muted: #6b8399;
    --ok: #18b77c;
    --ok-bg: rgba(24, 183, 124, 0.12);
    --ok-border: rgba(24, 183, 124, 0.45);
    --ok-text: #77e3be;
    --warn: #f2b848;
    --warn-bg: rgba(242, 184, 72, 0.12);
    --warn-border: rgba(242, 184, 72, 0.45);
    --warn-text: #ffd183;
    --err: #f05d5e;
    --err-bg: rgba(240, 93, 94, 0.12);
    --err-border: rgba(240, 93, 94, 0.45);
    --err-text: #ff9ea0;
    --info: #4cb5ff;
    --info-bg: rgba(76, 181, 255, 0.12);
    --info-border: rgba(76, 181, 255, 0.45);
    --info-text: #a3d9ff;
    --accent: #4cb5ff;
    --accent-hover: #6ac4ff;
}

* {
    box-sizing: border-box;
}

.app-body {
    min-height: 100vh;
    background: radial-gradient(1400px 600px at 80% -10%, #1f2f44 0%, var(--bg) 55%);
    color: var(--text);
    font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-shell {
    max-width: 1440px;
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}

.app-main {
    min-height: calc(100vh - 150px);
}

.app-footer {
    border-top: 1px solid var(--line);
    color: var(--muted);
    background: rgba(17, 25, 35, 0.6);
}

.topbar {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px 20px;
}

.brand {
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 0.3px;
    color: var(--text);
}

.brand-sub {
    color: var(--muted);
    font-size: 12px;
    margin-top: 2px;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--panel-2);
    color: var(--text-dim);
    padding: 4px 12px;
    font-size: 12px;
}

.status-dot {
    width: 9px;
    height: 9px;
    border-radius: 999px;
    display: inline-block;
}

.dot-ok {
    background: var(--ok);
    box-shadow: 0 0 8px rgba(24, 183, 124, 0.7);
}

.dot-err {
    background: var(--err);
    box-shadow: 0 0 8px rgba(240, 93, 94, 0.7);
}

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 16px;
}

.panel-title {
    color: var(--text-dim);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 12px;
}

.kpi {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 12px 14px;
}

.kpi .label {
    color: var(--muted);
    font-size: 12px;
    margin-bottom: 4px;
}

.kpi .value {
    font-size: 26px;
    font-weight: 700;
    line-height: 1.1;
}

.kpi .value.ok {
    color: var(--ok);
}

.kpi .value.warn {
    color: var(--warn);
}

.btn-ops {
    background: #1f3348;
    border: 1px solid #3a5570;
    color: #cae6ff;
    font-size: 13px;
    padding: 4px 12px;
    border-radius: 6px;
    transition: all 0.15s;
}

.btn-ops:hover {
    background: #26415b;
    color: #e4f2ff;
    border-color: #4c7a9e;
}

.btn-ops:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-ops.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.btn-primary-ops {
    background: rgba(76, 181, 255, 0.15);
    border: 1px solid var(--info-border);
    color: var(--accent);
    font-size: 13px;
    padding: 6px 16px;
    border-radius: 6px;
    font-weight: 500;
}

.btn-primary-ops:hover {
    background: rgba(76, 181, 255, 0.25);
    color: #fff;
}

.btn-success-ops {
    background: rgba(24, 183, 124, 0.15);
    border: 1px solid var(--ok-border);
    color: var(--ok);
    font-size: 14px;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
}

.btn-success-ops:hover {
    background: rgba(24, 183, 124, 0.25);
    color: #fff;
}

.btn-warn-ops {
    background: rgba(242, 184, 72, 0.15);
    border: 1px solid var(--warn-border);
    color: var(--warn-text);
    font-size: 14px;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
}

.btn-warn-ops:hover {
    background: rgba(242, 184, 72, 0.25);
    color: #fff;
}

.btn-danger-ops {
    background: rgba(240, 93, 94, 0.1);
    border: 1px solid var(--err-border);
    color: var(--err-text);
    font-size: 14px;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
}

.btn-danger-ops:hover {
    background: rgba(240, 93, 94, 0.22);
    color: #fff;
}

.form-control-dark,
.form-select-dark {
    background: var(--panel-3);
    border: 1px solid var(--line);
    color: var(--text);
    font-size: 14px;
    border-radius: 8px;
    padding: 8px 12px;
}

.form-control-dark::placeholder {
    color: var(--muted);
}

.form-control-dark:focus,
.form-select-dark:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(76, 181, 255, 0.15);
    background: var(--panel-3);
    color: var(--text);
}

.form-select-dark {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%2391a7bc' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 12px;
    padding-right: 32px;
    appearance: none;
}

.tabs-wrap .nav-tabs {
    border-bottom: 1px solid var(--line);
    gap: 4px;
}

.tabs-wrap .nav-tabs .nav-link {
    color: var(--text-dim);
    border: none;
    border-bottom: 2px solid transparent;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s;
    background: transparent;
}

.tabs-wrap .nav-tabs .nav-link.active,
.tabs-wrap .nav-tabs .nav-link:hover {
    color: var(--text);
    background: rgba(76, 181, 255, 0.06);
    border-bottom-color: var(--accent);
}

.tabs-wrap .nav-tabs .nav-link .bi {
    margin-right: 6px;
}

.table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text);
    --bs-table-border-color: var(--line);
    font-size: 14px;
}

.table thead th {
    color: var(--text-dim);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom-width: 1px;
}

.table tbody td {
    vertical-align: middle;
    border-bottom: 1px solid rgba(47, 67, 89, 0.4);
}

.badge-ok {
    background: var(--ok-bg);
    color: var(--ok-text);
    border: 1px solid var(--ok-border);
    font-weight: 500;
}

.badge-warn {
    background: var(--warn-bg);
    color: var(--warn-text);
    border: 1px solid var(--warn-border);
    font-weight: 500;
}

.badge-err {
    background: var(--err-bg);
    color: var(--err-text);
    border: 1px solid var(--err-border);
    font-weight: 500;
}

.badge-info {
    background: var(--info-bg);
    color: var(--info-text);
    border: 1px solid var(--info-border);
    font-weight: 500;
}

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--muted);
}

.empty-state .bi {
    font-size: 40px;
    margin-bottom: 12px;
    display: block;
    opacity: 0.4;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 10px 0;
    margin-bottom: 12px;
}

.pagination-dark .page-link {
    background: var(--panel-2);
    border: 1px solid var(--line);
    color: var(--text-dim);
    font-size: 13px;
    padding: 6px 12px;
}

.pagination-dark .page-link:hover {
    background: #26415b;
    color: var(--text);
}

.pagination-dark .page-item.active .page-link {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.point-slot {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.point-slot .point-no {
    font-weight: 700;
    font-size: 16px;
    color: var(--accent);
    min-width: 40px;
}

.point-slot.ok {
    border-left: 3px solid var(--ok);
}

.point-slot.warn {
    border-left: 3px solid var(--warn);
}

.point-slot.empty {
    border-left: 3px solid var(--line);
    opacity: 0.6;
}

.device-card {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 14px;
}

.device-card .imei {
    font-family: "Fira Code", monospace;
    font-size: 13px;
    color: var(--accent);
}

.text-dim {
    color: var(--text-dim) !important;
}

.text-muted-ops {
    color: var(--muted) !important;
}

.measurement-name-preview {
    background: var(--panel-3);
    border: 2px solid var(--line);
    color: var(--text-dim);
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    padding: 12px 16px;
}

.measurement-name-preview .warn {
    color: var(--warn-text);
    font-size: 13px;
    font-weight: 500;
}

.realtime-data {
    background-color: var(--panel-2);
    border-left: 4px solid var(--primary-color, #0d6efd);
    padding: 1rem;
    margin-bottom: 1rem;
}

.payload-field {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: 0.25rem;
    border: 1px solid var(--line);
}

.payload-field-name {
    font-weight: 600;
    color: var(--accent);
}

.realtime-chart-wrapper {
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    padding: 0.75rem;
    background: linear-gradient(180deg, rgba(22, 32, 44, 0.9), rgba(17, 25, 35, 1));
}

.chart-container-lg {
    height: 260px;
}

.json-display {
    background-color: #0d1117;
    color: #abb2bf;
    padding: 1rem;
    border-radius: 0.375rem;
    font-family: "Courier New", monospace;
    font-size: 0.875rem;
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--line);
}

.spinner-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.data-table {
    font-size: 0.875rem;
}

.data-table th {
    background-color: #1f3348;
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

.control-panel {
    background-color: var(--panel-2);
    border: 1px solid var(--line);
    padding: 1.5rem;
    border-radius: 0.375rem;
    margin-bottom: 1.5rem;
}

.chart-container {
    position: relative;
    height: 300px;
    margin-bottom: 1.5rem;
}

@media (max-width: 991px) {
    .kpi-row {
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .app-shell {
        padding-left: 12px;
        padding-right: 12px;
    }

    .topbar {
        padding: 12px;
    }

    .status-pill {
        display: none;
    }

    .control-panel {
        padding: 1rem;
    }
}