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

:root {
    --primary: #10b981;
    --primary-dim: #047857;
    --primary-glow: rgba(16, 185, 129, 0.4);
    --bg-dark: #0f172a;
    --bg-card: rgba(15, 23, 42, 0.85);
    --bg-glass: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-dim: #94a3b8;
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(16, 185, 129, 0.5);
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --blur: blur(24px);
    --danger: #ef4444;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.2);
}

/* Header */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0) 100%);
    pointer-events: none;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 16px;
    pointer-events: auto;
}

.logo-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px; height: 48px;
    background: linear-gradient(135deg, var(--primary-dim), var(--primary));
    border-radius: 12px;
    font-weight: 800; font-size: 18px;
    color: var(--bg-dark);
    box-shadow: 0 8px 24px var(--primary-glow);
}

.logo-area h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.header-actions {
    display: flex;
    gap: 16px;
    pointer-events: auto;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex; align-items: center; justify-content: center; gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dim));
    color: var(--bg-dark);
    box-shadow: 0 4px 15px var(--primary-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
    filter: brightness(1.1);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border);
    backdrop-filter: var(--blur);
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
    background: var(--danger);
    color: #fff;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

/* Layout */
.main-container {
    display: block;
    width: 100vw;
    height: 100vh;
    position: relative;
}

/* Panels Base Visibility */
.ui-panel {
    opacity: 0; pointer-events: none; visibility: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: fixed; top: 100px; left: 96px; z-index: 100;
    width: 320px;
    background: var(--bg-card); backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    padding: 20px; border-radius: var(--radius);
    border: 1px solid var(--border); box-shadow: var(--shadow);
    max-height: calc(100vh - 140px); overflow-y: auto; overflow-x: hidden;
    transform: translateX(-20px);
}
.ui-panel.panel-active {
    opacity: 1; pointer-events: auto; visibility: visible;
    transform: translateX(0);
}
.ui-panel::-webkit-scrollbar { width: 6px; }
.ui-panel::-webkit-scrollbar-track { background: transparent; }
.ui-panel::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }

/* Desktop Sidebar */
#desktop-sidebar {
    position: fixed; top: 100px; left: 32px; z-index: 100;
    display: flex; flex-direction: column; gap: 12px;
}
.sidebar-btn {
    display: flex; align-items: center; justify-content: center;
    width: 48px; height: 48px; background: var(--bg-glass);
    backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border); border-radius: 50%;
    color: var(--text-secondary); cursor: pointer; 
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}
.sidebar-btn svg { width: 20px; height: 20px; transition: transform 0.3s; }
.sidebar-btn::after {
    content: attr(title); position: absolute; left: 60px;
    background: var(--bg-card); padding: 6px 12px; border-radius: 6px;
    font-size: 12px; font-weight: 600; color: var(--text-primary);
    border: 1px solid var(--border); opacity: 0; pointer-events: none;
    transition: all 0.3s; transform: translateX(-10px);
    white-space: nowrap;
    z-index: 200;
}
.sidebar-btn:hover {
    background: rgba(255, 255, 255, 0.1); border-color: var(--border-hover);
    color: var(--text-primary); transform: scale(1.1);
}
.sidebar-btn:hover::after { opacity: 1; transform: translateX(0); }
.sidebar-btn.active {
    background: rgba(16, 185, 129, 0.15); border-color: var(--primary);
    color: var(--primary); box-shadow: 0 0 20px var(--primary-glow);
}
.sidebar-btn.active svg { transform: scale(1.1); }
.sidebar-divider {
    width: 32px; height: 1px; background: rgba(255,255,255,0.1); margin: 4px auto;
}

/* Panel Header */
.panel-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}
.panel-header h2 {
    font-size: 14px; font-weight: 700; color: var(--text-primary);
    letter-spacing: 1.5px; text-transform: uppercase;
    display: flex; align-items: center; gap: 8px;
}
.panel-toggle {
    width: 28px; height: 28px; display: flex; align-items: center;
    justify-content: center; border: none;
    background: rgba(255, 255, 255, 0.05); color: var(--text-secondary);
    border-radius: 8px; cursor: pointer; font-size: 12px;
    transition: all 0.2s ease;
}
.panel-toggle:hover { background: rgba(255, 255, 255, 0.1); color: var(--text-primary); transform: scale(1.05); }

/* Workspace */
.workspace {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--bg-dark);
    /* Subtle dot grid background for the canvas area */
    background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Sidebar Sections */
.config-section h3, .config-section .panel-header h2 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.config-section h3::before, .config-section .panel-header h2::before {
    content: '';
    display: block;
    width: 6px; height: 6px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--primary-glow);
}

.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.form-group select, .form-group input {
    width: 100%;
    padding: 10px 14px;
    background-color: rgba(0,0,0,0.3);
    border: 1px solid var(--border);
    color: #fff;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}
.form-group select:focus, .form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

.note {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: -8px;
}
.hidden {
    display: none !important;
}

/* Checkboxes */
.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    cursor: pointer;
    transition: color 0.2s ease;
}
.checkbox-label:hover {
    color: var(--text-primary);
}
.checkbox-label input {
    margin-top: 2px;
    accent-color: var(--primary);
    width: 16px; height: 16px;
    cursor: pointer;
}

/* Palette */
.draggable-palette {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.palette-item {
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 10px;
    text-align: center;
    cursor: grab;
    transition: all 0.3s ease;
    display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.palette-item:active { cursor: grabbing; }
.palette-item:hover {
    border-color: var(--border-hover);
    background: rgba(16, 185, 129, 0.05);
    transform: translateY(-2px);
}
.palette-item span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    pointer-events: none;
}

/* Icons for components */
.item-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    pointer-events: none;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1);
}
.trafo-icon { background-color: #00796B; }
.mt-icon { background-color: #455A64; }
.bt-icon { background-color: #607D8B; }
.ups-icon { background-color: #D32F2F; }
.custom-icon { background-color: #795548; background-image: repeating-linear-gradient(45deg, transparent, transparent 5px, rgba(0,0,0,0.2) 5px, rgba(0,0,0,0.2) 10px); }

/* Workspace Views */
.view-panel {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.canvas-toolbar {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 8px;
    display: flex;
    gap: 8px;
    z-index: 10;
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.canvas-toolbar.visible {
    opacity: 1; pointer-events: auto; top: 24px;
}

.btn-tool {
    padding: 8px 16px;
    font-size: 0.8rem;
    border-radius: 6px;
}

.canvas-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    padding: 20px;
}

#layout-canvas {
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.05);
    box-shadow: 0 24px 50px rgba(0,0,0,0.5);
    border-radius: 8px;
    touch-action: none;
    cursor: crosshair;
}

#three-container {
    width: 100%;
    height: 100%;
}

/* Mobile FABs */
#mobile-fabs { display: none; }

@media (max-width: 900px) {
    #desktop-sidebar { display: none !important; }
    
    #mobile-fabs { 
        display: flex; flex-direction: column; gap: 12px; position: fixed; 
        bottom: 180px; right: 16px; left: auto; top: auto; transform: none; z-index: 200; 
    }
    .mobile-fab { 
        width: 50px; height: 50px; border-radius: 50%; 
        background: var(--bg-card); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
        border: 1px solid var(--border); color: var(--text-primary); 
        display: flex; align-items: center; justify-content: center; 
        box-shadow: 0 8px 32px rgba(0,0,0,0.5); transition: all 0.3s; cursor: pointer;
        position: relative;
    }
    .mobile-fab.active { 
        background: var(--primary); border-color: var(--primary); 
        color: #000; box-shadow: 0 0 20px var(--primary-glow); 
    }
    .mobile-fab svg { width: 24px; height: 24px; }
    
    .ui-panel { 
        top: 140px; bottom: auto; left: 16px; right: 16px; width: auto; 
        padding: 16px; gap: 16px; max-height: calc(100vh - 140px); z-index: 150;
        transform: translateY(-20px);
    }
    .ui-panel.panel-active { transform: translateY(0); }
    .panel-header { display: none !important; }

    .header-actions .btn span {
        display: none; /* hide text on mobile buttons if we add SVG */
    }
    
    .canvas-toolbar {
        top: auto;
        bottom: 24px;
        flex-direction: row;
    }
    .canvas-toolbar.visible {
        top: auto;
        bottom: 24px;
    }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background: rgba(220, 38, 38, 0.95);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.1);
    animation: toastSlideUp 0.3s ease-out forwards;
    max-width: 400px;
    text-align: center;
    line-height: 1.4;
}

.toast.fade-out {
    animation: toastFadeOut 0.3s ease-in forwards;
}

@keyframes toastSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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