:root {
    --bg-deep: #050517;
    --bg-navy: #080056;
    --surface: rgba(18, 16, 58, 0.72);
    --surface-strong: rgba(14, 12, 48, 0.88);
    --surface-hover: rgba(28, 30, 86, 0.82);
    --border: rgba(120, 140, 230, 0.18);
    --border-strong: rgba(140, 160, 255, 0.32);

    --text: #eef0ff;
    --text-muted: #9ba3c7;
    --text-dim: #6b7399;

    --brand-blue-1: #046bf5;
    --brand-blue-2: #0a56ea;
    --brand-blue-3: #043ca7;
    --brand-yellow: #fdc84e;
    --brand-coral: #fc826a;

    --ping-blue: #4b8bff;
    --ping-green: #22d3a6;
    --ping-yellow: #fdc84e;
    --ping-red: #fc826a;

    --shadow-lg: 0 18px 50px rgba(2, 4, 28, 0.55);
    --shadow-glow: 0 0 0 1px rgba(120, 140, 230, 0.08), 0 8px 30px rgba(4, 12, 60, 0.45);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    -webkit-font-smoothing: antialiased;
    color: var(--text);
    background: var(--bg-deep);
    overflow: hidden;
}

.map {
    position: fixed;
    inset: 0;
    height: 100vh;
    width: 100vw;
    background: var(--bg-deep);
    z-index: 0;
}

/* Glass panel base */
.panel {
    background: var(--surface);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Brand card */
.brand-card {
    position: fixed;
    top: 20px;
    left: 20px;
    padding: 6px 18px 6px 6px;
    display: flex;
    align-items: center;
    gap: 2px;
    z-index: 1000;
}

.brand-icon {
    width: 76px;
    height: 76px;
    display: block;
    flex-shrink: 0;
    filter: drop-shadow(0 4px 10px rgba(4, 107, 245, 0.28));
}

.brand-card h1 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.015em;
    color: var(--text);
    line-height: 1;
}

/* Sidebar */
.sidebar-panel {
    position: fixed;
    top: 140px;
    left: 20px;
    width: 300px;
    max-height: calc(100vh - 240px);
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    z-index: 1000;
    transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.25s ease;
}

.sidebar-panel.collapsed {
    transform: translateX(calc(-100% - 28px));
    opacity: 0;
    pointer-events: none;
}

.sidebar-collapse {
    position: absolute;
    top: 14px;
    right: -14px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--border-strong);
    background: var(--surface-strong);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s, background 0.2s, transform 0.3s;
    z-index: 2;
    backdrop-filter: blur(14px);
}

.sidebar-collapse:hover {
    color: var(--text);
    background: var(--surface-hover);
}

.sidebar-collapse svg {
    width: 14px;
    height: 14px;
    transition: transform 0.3s ease;
}

.sidebar-panel.collapsed + .sidebar-collapse,
body.sidebar-collapsed .sidebar-collapse {
    transform: rotate(180deg);
}

.sidebar-inner {
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-height: 0;
}

.add-datacenter {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-wrap {
    position: relative;
}

.input-icon {
    position: absolute;
    top: 50%;
    left: 12px;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-dim);
    pointer-events: none;
}

.add-datacenter input {
    width: 100%;
    padding: 10px 12px 10px 36px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: rgba(5, 5, 23, 0.45);
    color: var(--text);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

.add-datacenter input::placeholder {
    color: var(--text-dim);
}

.add-datacenter input:focus {
    outline: none;
    border-color: var(--brand-blue-1);
    background: rgba(5, 5, 23, 0.6);
    box-shadow: 0 0 0 3px rgba(4, 107, 245, 0.18);
}

.monday-button {
    width: 100%;
    padding: 10px 14px;
    border: none;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--brand-blue-1), var(--brand-blue-2) 60%, var(--brand-blue-3));
    color: #fff;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
    box-shadow: 0 6px 16px rgba(4, 107, 245, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.monday-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 40%);
    opacity: 0;
    transition: opacity 0.2s;
}

.monday-button:hover:not(:disabled) {
    transform: translateY(-1px);
    filter: brightness(1.08);
    box-shadow: 0 10px 24px rgba(4, 107, 245, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.monday-button:hover:not(:disabled)::before {
    opacity: 1;
}

.monday-button:active:not(:disabled) {
    transform: translateY(0);
}

.monday-button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.monday-button.loading {
    color: transparent;
}

.monday-button.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-top: -8px;
    margin-left: -8px;
    border: 2px solid rgba(255, 255, 255, 0.85);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Autocomplete */
.autocomplete-list {
    position: absolute;
    z-index: 1001;
    top: calc(100% + 6px);
    left: 0;
    width: 100%;
    background: var(--surface-strong);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    max-height: 240px;
    overflow-y: auto;
    display: none;
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: 4px;
}

.autocomplete-list li {
    padding: 8px 10px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 13px;
    color: var(--text);
    transition: background 0.15s;
}

.autocomplete-list li strong {
    color: var(--brand-yellow);
    font-weight: 600;
}

.autocomplete-list li:hover,
.autocomplete-active {
    background: rgba(4, 107, 245, 0.22);
}

/* Sidebar meta */
.sidebar-meta {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding: 0 2px;
}

.sidebar-heading {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.sidebar-count {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(120, 140, 230, 0.14);
}

.datacenter-list {
    flex: 1 1 auto;
    overflow-y: auto;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 5px;
    padding: 2px;
    margin-right: -4px;
}

.datacenter-list::-webkit-scrollbar {
    width: 6px;
}
.datacenter-list::-webkit-scrollbar-track { background: transparent; }
.datacenter-list::-webkit-scrollbar-thumb {
    background: rgba(120, 140, 230, 0.2);
    border-radius: 3px;
}
.datacenter-list::-webkit-scrollbar-thumb:hover {
    background: rgba(120, 140, 230, 0.4);
}

.datacenter-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 4px 4px 9px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(5, 5, 23, 0.45);
    font-size: 12px;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: background 0.18s, border-color 0.18s, color 0.18s, opacity 0.2s, box-shadow 0.2s;
    position: relative;
    max-width: 100%;
    line-height: 1;
}

.datacenter-item::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--ping-blue);
    box-shadow: 0 0 6px rgba(75, 139, 255, 0.6);
    flex-shrink: 0;
    transition: background 0.2s, box-shadow 0.2s;
}

.datacenter-item:hover {
    background: var(--surface-hover);
    border-color: var(--border-strong);
}

.datacenter-item.disabled {
    opacity: 0.5;
    color: var(--text-muted);
}

.datacenter-item.disabled::before {
    background: var(--text-dim);
    box-shadow: none;
}

.datacenter-item.selected {
    background: rgba(4, 107, 245, 0.22);
    border-color: rgba(4, 107, 245, 0.6);
    color: #fff;
    box-shadow: 0 0 0 1px rgba(4, 107, 245, 0.35), 0 4px 14px rgba(4, 107, 245, 0.25);
}

.datacenter-item.selected::before {
    background: var(--brand-yellow);
    box-shadow: 0 0 8px rgba(253, 200, 78, 0.6);
}

.datacenter-item.loading {
    opacity: 0.7;
    font-style: italic;
    cursor: default;
    color: var(--text-muted);
}

.datacenter-item.estimated {
    font-style: italic;
}

.datacenter-item.estimated::before {
    width: 7px;
    height: 7px;
    background: transparent;
    border: 1.5px dashed var(--ping-blue);
    box-shadow: none;
}

.datacenter-item.estimated.disabled::before {
    border-color: var(--text-dim);
}

.datacenter-item.estimated.selected::before {
    background: transparent;
    border-color: var(--brand-yellow);
    box-shadow: 0 0 6px rgba(253, 200, 78, 0.45);
}

.datacenter-name {
    flex: 0 1 auto;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
}

.datacenter-remove {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 14px;
    line-height: 1;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.5;
    transition: color 0.2s, background 0.2s, opacity 0.2s;
}

.datacenter-item:hover .datacenter-remove {
    opacity: 1;
}

.datacenter-remove:hover {
    color: var(--brand-coral);
    background: rgba(252, 130, 106, 0.18);
}

.datacenter-item.loading .datacenter-remove {
    display: none;
}

.sidebar-empty {
    display: none;
    padding: 18px 8px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.sidebar-empty p {
    line-height: 1.5;
}

.sidebar-empty-hint {
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-dim);
}

.sidebar-panel.is-empty .datacenter-list { display: none; }
.sidebar-panel.is-empty .sidebar-empty { display: block; }

/* Legend card (bottom center) */
.legend-card {
    position: fixed;
    bottom: 22px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 16px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.toggle-controls {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: center;
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(5, 5, 23, 0.4);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, opacity 0.2s;
    user-select: none;
}

.toggle-item:hover {
    background: var(--surface-hover);
    border-color: var(--border-strong);
}

.toggle-item.disabled {
    opacity: 0.4;
}

.toggle-item.disabled .toggle-dot {
    background: var(--text-dim) !important;
    box-shadow: none;
}

.toggle-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.05);
}

.toggle-item[data-color="blue"]   .toggle-dot { background: var(--ping-blue);   box-shadow: 0 0 8px rgba(75, 139, 255, 0.5); }
.toggle-item[data-color="green"]  .toggle-dot { background: var(--ping-green);  box-shadow: 0 0 8px rgba(34, 211, 166, 0.55); }
.toggle-item[data-color="yellow"] .toggle-dot { background: var(--ping-yellow); box-shadow: 0 0 8px rgba(253, 200, 78, 0.55); }
.toggle-item[data-color="red"]    .toggle-dot { background: var(--ping-red);    box-shadow: 0 0 8px rgba(252, 130, 106, 0.55); }

.estimation-legend {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 6px 0;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    padding-top: 8px;
    width: 100%;
    justify-content: center;
}

.legend-label {
    font-weight: 600;
    color: var(--text-dim);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.legend-dash {
    display: inline-block;
    width: 14px;
    height: 9px;
    border: 2px dashed;
    border-radius: 50%;
    background: transparent;
}

/* Info panel (floats near cursor) */
#infoPanel {
    position: absolute;
    padding: 12px 14px;
    max-width: 320px;
    min-width: 200px;
    z-index: 1001;
    display: none;
    font-size: 13px;
    pointer-events: none;
}

#infoPanel h3 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.005em;
    color: var(--text);
    margin-bottom: 8px;
}

#infoPanel p {
    font-size: 12px;
    color: var(--text-muted);
}

.info-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 3px 0;
}

.info-row .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 6px currentColor;
}

.info-row .dot.dashed {
    background: transparent !important;
    border: 1.5px dashed currentColor;
    box-shadow: none;
}

.info-row .city-name {
    flex: 1 1 auto;
    font-size: 12px;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.info-row .ping-time {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.info-proxy-details {
    font-size: 11px;
    color: var(--text-dim);
    margin-top: 4px;
    line-height: 1.4;
}

.info-label {
    font-weight: 600;
    color: var(--text-muted);
}

/* Toasts */
#toastContainer {
    position: fixed;
    bottom: 22px;
    right: 22px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    color: var(--text);
    background: var(--surface-strong);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--border-strong);
    font-size: 12.5px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), toastOut 0.3s ease 3.7s forwards;
    max-width: 320px;
    pointer-events: auto;
    border-left: 3px solid var(--brand-blue-1);
}

.toast.error   { border-left-color: var(--brand-coral); }
.toast.success { border-left-color: var(--ping-green); }
.toast.info    { border-left-color: var(--brand-blue-1); }

@keyframes toastIn {
    from { opacity: 0; transform: translateY(12px) scale(0.98); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toastOut {
    from { opacity: 1; }
    to   { opacity: 0; transform: translateY(-6px); }
}

/* Leaflet overrides for dark theme */
.leaflet-container {
    background: var(--bg-deep) !important;
    font-family: inherit !important;
}

.leaflet-control-zoom {
    border: 1px solid var(--border-strong) !important;
    border-radius: var(--radius-sm) !important;
    overflow: hidden;
    box-shadow: var(--shadow-lg) !important;
}

.leaflet-control-zoom a {
    background: var(--surface-strong) !important;
    color: var(--text) !important;
    border: none !important;
    border-bottom: 1px solid var(--border) !important;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    font-weight: 500 !important;
    transition: background 0.2s, color 0.2s;
}

.leaflet-control-zoom a:last-child {
    border-bottom: none !important;
}

.leaflet-control-zoom a:hover {
    background: var(--surface-hover) !important;
    color: var(--brand-yellow) !important;
}

.leaflet-control-attribution {
    background: rgba(5, 5, 23, 0.72) !important;
    color: var(--text-dim) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 6px 0 0 0 !important;
    padding: 2px 8px !important;
    font-size: 10px !important;
}

.leaflet-control-attribution a {
    color: var(--text-muted) !important;
}

.leaflet-popup-content-wrapper {
    background: var(--surface-strong) !important;
    color: var(--text) !important;
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-lg) !important;
    backdrop-filter: blur(14px);
}

.leaflet-popup-tip {
    background: var(--surface-strong) !important;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar-panel {
        top: auto;
        bottom: 100px;
        left: 12px;
        right: 12px;
        width: auto;
        max-height: 50vh;
    }

    .brand-card {
        top: 12px;
        left: 12px;
        padding: 10px 14px 10px 12px;
    }

    .brand-card h1 { font-size: 13px; }

    .legend-card {
        bottom: 12px;
        left: 12px;
        right: 12px;
        transform: none;
        padding: 10px 12px;
    }

    .toggle-controls {
        justify-content: flex-start;
    }
}