:root {
    /* Siemens Energy Official Colors */
    --bg-main: #1B1534; /* SE Dark Purple */
    --bg-sidebar: #120e24; /* Darker shade for sidebar hierarchy */
    --bg-card: #201a3d; /* Slightly lighter for cards/topbar */
    --bg-card-hover: #2a224f;
    --text-main: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --border-line: rgba(255, 255, 255, 0.15);
    --border-hover: rgba(255, 255, 255, 0.3);
    --accent-color: #009999; /* Siemens Petrol */
    --accent-bright: #8A00E5; /* SE Bright Purple */
    --accent-hover: #008080;
    
    /* Layout */
    --sidebar-width: 280px;
    --topbar-height: 64px;
}

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

body {
    /* Strict Enterprise Typography */
    font-family: Arial, Helvetica, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden; 
}

/* Elegant Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

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

/* Solid Enterprise Panels (Removed Glassmorphism) */
.glass-panel {
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-line);
}

.glass-panel-top {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-line);
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 10;
    transition: transform 0.2s ease;
}

.brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    justify-content: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-line);
    gap: 12px;
}

.logo-container {
    background: transparent;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-logo {
    height: 28px;
    width: auto;
}

.brand h1 {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    line-height: 1.2;
    text-transform: uppercase;
}

.nav-menu {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.9rem;
    transition: background 0.2s, color 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--bg-card-hover);
    color: var(--text-main);
}

.nav-item.active {
    background: rgba(0, 153, 153, 0.1);
    color: var(--text-main);
    border-left: 3px solid var(--accent-color);
    font-weight: 600;
}

/* SVG Icon Styling for Sidebar */
.nav-icon-img {
    height: 24px;
    width: 24px;
    flex-shrink: 0;
}

.brand-icon-crop {
    object-fit: cover;
    object-position: left center;
}

.custom-icon-contain {
    object-fit: contain;
    object-position: center;
}

.invert-white {
    filter: brightness(0) invert(1);
}

/* Re-enable the HTML text */
.nav-text {
    font-size: 0.9rem;
    font-weight: 500;
}

.sidebar-footer {
    padding: 1.25rem;
    border-top: 1px solid var(--border-line);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    width: calc(100vw - var(--sidebar-width));
}

.topbar {
    min-height: var(--topbar-height);
    height: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 2rem;
    z-index: 5;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

.header-titles {
    display: flex;
    flex-direction: column;
}

#greeting-title {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#current-dashboard-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 2px;
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    background: transparent;
    border: 1px solid var(--border-line);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.1rem;
}

.action-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-main);
    border-color: var(--border-hover);
}

/* Dashboard Container */
.dashboard-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #ffffff; /* White background behind reports is best for PowerBI */
}

/* Iframe */
.dashboard-iframe {
    width: 100%;
    height: 100%;
    border: none;
    transition: opacity 0.3s ease;
}

.inactive-iframe {
    position: absolute !important;
    left: -99999px !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

/* Empty State */
.empty-state {
    text-align: center;
    color: #666;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    height: 100%;
}

.empty-state h3 {
    margin: 1rem 0 0.5rem;
    color: #333;
    font-weight: 600;
}

.empty-state.hidden {
    display: none;
}

/* Loader */
.loader-overlay {
    position: absolute;
    inset: 0;
    background: #1B1534; /* Keep consistent with theme background during loads */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 20;
    transition: opacity 0.3s ease;
}

.loader-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.tech-loader {
    position: relative;
    width: 100px;
    height: 100px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.core-node {
    width: 20px;
    height: 20px;
    background-color: var(--accent-color);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent-color), 0 0 40px var(--accent-color);
    animation: pulseNode 2s infinite ease-in-out;
}

.orbit {
    position: absolute;
    border: 2px solid transparent;
    border-radius: 50%;
}

.ring-1 {
    width: 50px;
    height: 50px;
    border-top-color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    animation: rotateCW 1.5s linear infinite;
}

.ring-2 {
    width: 75px;
    height: 75px;
    border-left-color: var(--accent-bright);
    border-right-color: var(--accent-bright);
    animation: rotateCCW 2.5s linear infinite;
}

.ring-3 {
    width: 100px;
    height: 100px;
    border-top-color: var(--accent-color);
    border-left-color: var(--accent-bright);
    animation: rotateCW 4s linear infinite;
}

.loader-text {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 0.9rem;
    color: var(--text-main);
    text-align: center;
    max-width: 500px;
    padding: 0 1.5rem;
    line-height: 1.5;
    animation: pulseText 2s infinite ease-in-out;
}

@keyframes rotateCW {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes rotateCCW {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(-360deg); }
}

@keyframes pulseNode {
    0%, 100% { transform: scale(0.8); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 1; }
}

@keyframes pulseText {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        background: var(--bg-main);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        width: 100vw;
    }
    
    .mobile-menu-btn {
        display: block;
    }
}