:root {
    /* Light Mode (Default) */
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #ffffff;
    --sidebar-hover: #334155;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --header-bg: #ffffff;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --sidebar-width: 260px;
    --header-height: 64px;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --sidebar-bg: #020617;
    --sidebar-text: #64748b;
    --sidebar-active: #f1f5f9;
    --sidebar-hover: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --header-bg: #0f172a;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    overflow-x: hidden;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 50;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header .logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.25rem;
    color: white;
    text-decoration: none;
}

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

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0.75rem;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: inherit;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.sidebar-nav li.active a {
    background-color: var(--primary);
    color: var(--sidebar-active);
}

.sidebar-nav li:not(.active) a:hover {
    background-color: var(--sidebar-hover);
    color: var(--sidebar-active);
}

/* Main Wrapper & Top Header */
.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0;
    transition: margin-left 0.3s ease;
}

.top-header {
    height: var(--header-height);
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 40;
}

.mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
}

.mobile-toggle:hover {
    background-color: var(--bg-color);
}

/* Theme Switcher Styles */
.theme-switcher {
    display: flex;
    background-color: var(--bg-color);
    padding: 2px;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    margin-left: auto;
}

.theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 0.5rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.theme-btn:hover {
    color: var(--text-main);
}

.theme-btn.active {
    background-color: var(--card-bg);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Page Content */
.page-content {
    padding: 2.5rem;
    flex: 1;
}

.card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    overflow: hidden;
}

/* Table Styles */
.table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.data-table th {
    padding: 1rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    background-color: var(--bg-color);
}

.data-table td {
    padding: 1rem 1.5rem;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
    vertical-align: middle;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .data-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.dashboard-container {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    width: 100%;
    max-width: 800px;
    border: 1px solid var(--border);
    margin: 0 auto;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

p.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}

.variables-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.variable-row {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 0.75rem;
    align-items: center;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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

input {
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    background-color: var(--card-bg);
    color: var(--text-main);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    outline: none;
    transition: all 0.2s;
}

input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn {
    padding: 0.625rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-color);
}

.btn-danger {
    background-color: transparent;
    color: var(--danger);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 0.375rem;
}

.btn-danger:hover {
    color: var(--danger-hover);
    background-color: rgba(239, 68, 68, 0.1);
}

.actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    margin-top: 1rem;
}

/* Sidebar Transition */
.sidebar {
    transition: transform 0.3s ease;
}

/* Responsive Queries */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }

    .dashboard-container {
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-wrapper {
        margin-left: 0;
    }

    .top-header {
        padding: 0 1rem;
    }

    .page-content {
        padding: 1.5rem 1rem;
    }

    .dashboard-container {
        padding: 1.5rem;
    }

    .variable-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        background-color: var(--bg-color);
        padding: 1rem;
        border-radius: 0.75rem;
        position: relative;
    }

    .btn-danger {
        position: absolute;
        top: 0.5rem;
        right: 0.5rem;
    }

    .actions {
        flex-direction: column;
        gap: 1rem;
    }

    .actions .btn {
        width: 100%;
    }
}