:root {
    /* Color Palette - Deep Space & Neon */
    --bg-main: #0b0e14;
    --bg-panel: #151a23;
    --bg-panel-glass: rgba(21, 26, 35, 0.7);
    --primary: #00f2ea;
    --primary-dim: rgba(0, 242, 234, 0.1);
    --secondary: #7000ff;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --success: #10b981;
    --danger: #ef4444;
    --border: #2d3748;

    /* Effects */
    --glass-blur: blur(12px);
    --glow-primary: 0 0 20px rgba(0, 242, 234, 0.3);
    --shadow-panel: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
    font-smooth: always;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    height: 100vh;
    display: flex;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: #fff;
    letter-spacing: -0.02em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s ease;
}

/* Layout */
#app {
    display: flex;
    width: 100%;
    height: 100vh;
    background: radial-gradient(circle at top right, #1a202c 0%, var(--bg-main) 40%);
}

/* Sidebar */
.sidebar {
    display: none;
    /* Hidden per user request */
    width: 260px;
    background-color: var(--bg-panel-glass);
    backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border);
    flex-direction: column;
    padding: 2rem 1.5rem;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-shadow: var(--glow-primary);
}

.logo span {
    color: var(--primary);
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-item:hover,
.nav-item.active {
    background-color: var(--primary-dim);
    color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 242, 234, 0.05);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2.5rem 3rem;
    overflow-y: auto;
    position: relative;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.welcome-text h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.welcome-text p {
    color: var(--text-muted);
}

.status-bar {
    display: flex;
    gap: 1.5rem;
}

.status-card {
    background: var(--bg-panel);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.status-card .icon {
    color: var(--success);
}

/* Grid Layout for Modules */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
    animation: fadeIn 0.4s ease-out forwards;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary), var(--primary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-panel), 0 0 20px rgba(0, 0, 0, 0.2);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-header h3 {
    font-size: 1.25rem;
}

/* Inputs & Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.input-glass {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    color: #fff;
    font-family: var(--font-body);
    transition: 0.3s;
}

.input-glass:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-dim);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    font-family: var(--font-heading);
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary), #5b4dd4);
    color: #fff;
    box-shadow: 0 4px 15px rgba(112, 0, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(112, 0, 255, 0.4);
}

/* Utility */
.text-highlight {
    color: var(--primary);
}

.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        padding: 1rem;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .logo {
        margin-bottom: 0;
        font-size: 1.2rem;
    }

    .nav-menu {
        flex-direction: row;
        gap: 1rem;
        display: none;
        /* Mobile menu toggle logic would ideally go here, simplifying for MVP */
    }

    .sidebar .nav-item:last-child {
        display: none;
        /* Hide settings on top in mobile */
    }

    .main-content {
        padding: 1.5rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .status-bar {
        width: 100%;
        overflow-x: auto;
    }

    .dashboard-grid,
    div[style*="grid-template-columns"] {
        grid-template-columns: 1fr !important;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card:nth-child(2) {
    animation-delay: 0.1s;
}

.card:nth-child(3) {
    animation-delay: 0.2s;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dim);
}

/* --- COLLAPSIBLE SIDEBAR --- */
.sidebar {
    transition: width 0.3s ease;
    position: relative;
}

.sidebar.collapsed {
    width: 80px;
    padding: 2rem 10px;
    align-items: center;
}

/* .sidebar.collapsed .logo span, .sidebar.collapsed .logo i rule removed (empty) */

.sidebar.collapsed .logo {
    justify-content: center;
    font-size: 1.2rem;
}

.sidebar.collapsed .logo span {
    display: none;
}

/* Hide "Pro" text */
.sidebar.collapsed .logo i {
    margin: 0;
}

.sidebar.collapsed .nav-item span {
    display: none;
}

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 0.75rem;
}

.sidebar.collapsed .nav-item i {
    margin: 0;
    font-size: 1.2rem;
}

/* Toggle Button */
.sidebar-toggle-btn {
    position: absolute;
    top: 50%;
    right: -12px;
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 2px solid var(--bg-main);
    color: var(--bg-main);
    font-size: 0.8rem;
    z-index: 100;
    transition: transform 0.3s;
}

.sidebar.collapsed .sidebar-toggle-btn {
    transform: rotate(180deg);
}

/* Ghost Pole & AG Auto-Placement Styles */
.ghost-pole-marker {
    background: rgba(255, 255, 255, 0.4);
    border: 2px dashed rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    width: 12px;
    height: 12px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    pointer-events: none !important;
    transition: all 0.05s linear;
}

.span-line-valid {
    stroke: #10b981 !important;
    stroke-width: 3px !important;
    stroke-dasharray: 5, 5;
    opacity: 0.8;
    pointer-events: none;
}

.span-line-warning {
    stroke: #f59e0b !important;
    stroke-width: 3px !important;
    stroke-dasharray: 5, 5;
    opacity: 0.9;
    pointer-events: none;
}

.span-line-invalid {
    stroke: #ef4444 !important;
    stroke-width: 4px !important;
    stroke-dasharray: 3, 3;
    opacity: 0.9;
    pointer-events: none;
}

.tooltip-ghost {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
}