:root {
    /* Premium Dark Theme Core */
    --bg-main: #06090f;
    --bg-sidebar: rgba(10, 15, 26, 0.7);
    --bg-panel: rgba(15, 23, 42, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 255, 255, 0.15);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    /* Brand & Accent Colors - Vivid and Modern */
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-blue-glow: rgba(59, 130, 246, 0.4);
    --accent-green: #10b981;
    --accent-green-glow: rgba(16, 185, 129, 0.4);
    --accent-purple: #8b5cf6;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    /* Typography & Spacing */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    
    /* Glassmorphism */
    --backdrop-blur: blur(16px);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Application Layout */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* Top Navigation Bar */
.top-bar {
    height: 64px;
    background: var(--bg-sidebar);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 28px;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    color: var(--accent-blue);
    font-size: 1.6rem;
    filter: drop-shadow(0 0 8px var(--accent-blue-glow));
}

.brand h1 {
    font-size: 1.4rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-accent {
    color: var(--accent-blue);
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-sub {
    margin-left: 14px;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-left: 1px solid var(--border-color);
    padding-left: 14px;
    font-weight: 500;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.status-badge {
    padding: 6px 14px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 20px;
    color: var(--accent-green);
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.1);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-green);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.top-bar-time {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    font-weight: 500;
    background: rgba(255,255,255,0.03);
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

/* Main Layout (Map + Sidebar) */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.sidebar {
    width: 360px;
    background: var(--bg-sidebar);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
    box-shadow: 5px 0 25px rgba(0,0,0,0.3);
    transition: transform var(--transition-smooth);
}

/* Module Tabs */
.module-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 1px;
    background-color: var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.module-tab {
    background: rgba(15, 23, 42, 0.8);
    border: none;
    padding: 16px 12px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.module-tab::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0; height: 3px;
    background: var(--accent-blue);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

.module-tab:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.module-tab.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.module-tab.active::before {
    transform: scaleX(1);
}

.module-tab i {
    font-size: 1.3rem;
    transition: transform var(--transition-fast);
}

.module-tab:hover i {
    transform: translateY(-2px);
}

.module-tab span {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.module-tab small {
    font-size: 0.65rem;
    opacity: 0.7;
    margin-top: 2px;
}

/* Module Panels */
.module-panels {
    flex: 1;
    overflow-y: auto;
    position: relative;
    padding: 24px;
}

.module-panel {
    display: none;
    animation: fadeSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.module-panel.active {
    display: block;
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 14px;
    position: relative;
}

.panel-title::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 40px; height: 3px;
    background: var(--accent-blue);
    border-radius: 2px;
}

/* Control Elements */
.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 10px;
    letter-spacing: 0.3px;
}

.control-select, .control-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 14px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: all var(--transition-fast);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.control-select:focus, .control-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), inset 0 2px 4px rgba(0,0,0,0.1);
}

.control-range {
    width: 100%;
    margin-bottom: 10px;
    accent-color: var(--accent-blue);
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
}

.control-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px; height: 16px;
    background: var(--accent-blue);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-blue-glow);
    transition: transform var(--transition-fast);
}

.control-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.range-value {
    display: block;
    text-align: right;
    font-size: 0.85rem;
    color: var(--accent-blue);
    font-weight: 700;
}

.control-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--accent-blue), #2563eb);
    color: #fff;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    transition: all var(--transition-fast);
    margin-top: 28px;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
    background: linear-gradient(135deg, #4f46e5, var(--accent-blue));
}

.control-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(59, 130, 246, 0.3);
}

.control-btn:disabled {
    background: #475569;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
}

.info-box {
    margin-top: 28px;
    padding: 16px;
    background: rgba(59, 130, 246, 0.08);
    border-left: 4px solid var(--accent-blue);
    border-radius: 0 8px 8px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.info-box strong {
    color: var(--text-main);
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
}

/* Station List Elements */
.station-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.station-item {
    padding: 14px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.station-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0; width: 4px;
    background: transparent;
    transition: background var(--transition-fast);
}

.station-item:hover {
    border-color: var(--border-highlight);
    background: rgba(255,255,255,0.06);
    transform: translateX(4px);
}

.station-item.active {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
}

.station-item.active::before {
    background: var(--accent-blue);
}

.station-item-info strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.station-item-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.station-ispu-badge {
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    min-width: 60px;
    text-align: center;
    transition: background-color 0.5s ease;
}

.loading-spinner {
    text-align: center;
    color: var(--accent-blue);
    padding: 30px;
    font-size: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.loading-spinner i {
    font-size: 2rem;
}

/* Map Area */
.main-content {
    position: relative;
    flex: 1;
    background: #000;
}

.map-container {
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Floating Panels over Map */
.floating-panel {
    position: absolute;
    background: var(--bg-panel);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    z-index: 500;
    box-shadow: 0 16px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.05) inset;
    animation: fadeSlideUp 0.4s ease-out;
}

.top-left { top: 24px; left: 80px; } /* Adjust for leaflet controls */
.top-right { top: 24px; right: 24px; }
.bottom-left { bottom: 24px; left: 24px; }
.bottom-right { bottom: 34px; right: 24px; }
.bottom-center {
    bottom: 34px;
    left: 50%;
    transform: translateX(-50%);
}

.floating-panel h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ISPU Panel specific */
.ispu-circle-mini {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(0,0,0,0.4);
    border: 6px solid gray;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 16px auto;
    position: relative;
    transition: all var(--transition-smooth);
}

.ispu-val {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.ispu-cat {
    font-size: 0.8rem;
    font-weight: 700;
    margin-top: 6px;
    background: rgba(0,0,0,0.6);
    padding: 4px 12px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ispu-critical {
    text-align: center;
    font-size: 0.85rem;
    margin-top: 12px;
    font-weight: 500;
}

.ispu-time {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Legend items */
.legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
    font-size: 0.85rem;
    font-weight: 500;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

/* Chart Panel specific */
#chart-panel {
    width: 700px;
    max-width: calc(100vw - 420px);
}

.chart-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 16px;
}

.chart-panel-header h4 {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
    font-size: 1.1rem;
}

.close-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    width: 30px; height: 30px;
    border-radius: 50%;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
    transform: rotate(90deg);
}

.chart-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 350px;
    position: relative;
    width: 100%;
}

/* Leaflet dark theme override & Premium Mapping */
.leaflet-container {
    background: #090e17 !important;
}

.leaflet-layer,
.leaflet-control-zoom-in,
.leaflet-control-zoom-out,
.leaflet-control-attribution {
    filter: invert(100%) hue-rotate(180deg) brightness(85%) contrast(105%) saturate(120%);
}

.leaflet-marker-icon {
    filter: none;
}

.leaflet-popup-content-wrapper, .leaflet-popup-tip {
    background: rgba(15, 23, 42, 0.95) !important;
    backdrop-filter: blur(8px) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--border-color) !important;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5) !important;
    border-radius: 8px !important;
}

.leaflet-popup-content {
    margin: 14px;
    font-family: var(--font-family);
}

.leaflet-container a.leaflet-popup-close-button {
    color: var(--text-muted) !important;
    padding: 6px !important;
}

.leaflet-container a.leaflet-popup-close-button:hover {
    color: var(--text-main) !important;
}

.leaflet-bar {
    border: none !important;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3) !important;
    border-radius: 8px !important;
    overflow: hidden;
}

.leaflet-bar a {
    background-color: var(--bg-panel) !important;
    color: var(--text-main) !important;
    border-bottom: 1px solid var(--border-color) !important;
    backdrop-filter: blur(8px) !important;
}

.leaflet-bar a:hover {
    background-color: rgba(255,255,255,0.1) !important;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.2);
}
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.15);
    border-radius: 10px;
    border: 1px solid rgba(0,0,0,0.2);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.25);
}

/* Overlay Loading Screen */
#loading-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: var(--bg-main);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.6s ease, visibility 0.6s;
}

#loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-logo i {
    font-size: 4rem;
    color: var(--accent-blue);
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 0 20px var(--accent-blue-glow));
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

.loader-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.loader-bar {
    width: 250px;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.loader-progress {
    position: absolute;
    top: 0; left: 0; height: 100%;
    background: var(--accent-blue);
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--accent-blue);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

.toast {
    width: 350px;
    background: var(--bg-panel);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    transform: translateX(120%);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    pointer-events: auto;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-icon {
    font-size: 1.4rem;
    margin-top: 2px;
}

.toast-success .toast-icon { color: var(--accent-green); }
.toast-error .toast-icon { color: var(--danger); }
.toast-info .toast-icon { color: var(--accent-blue); }

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 4px;
    color: var(--text-main);
}

.toast-msg {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 4px;
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-main);
}