:root {
    /* Brand Colors - Sleek Violet/Indigo Theme */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.1);
    --secondary-color: #10b981;
    --secondary-hover: #059669;
    --secondary-light: rgba(16, 185, 129, 0.1);
    --danger-color: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    --warning-color: #f59e0b;
    --info-color: #0ea5e9;
    /* Base Layout Colors - Light Mode */
    --bg-color: #f8fafc;
    /* Very soft blue-grey for main background */
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    /* Slate 900 */
    --text-secondary: #64748b;
    /* Slate 500 */
    --border-color: #e2e8f0;
    /* Slate 200 */
    /* Sidebar specific */
    --sidebar-bg: #0f172a;
    /* Dark slate */
    --sidebar-text: #cbd5e1;
    --sidebar-hover: #1e293b;
    --sidebar-active-bg: rgba(99, 102, 241, 0.15);
    --sidebar-active-text: #818cf8;
    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-card: 0px 5px 15px rgba(0, 0, 0, 0.03);
    /* Soft floating shadow */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 1rem;
    --transition-speed: 0.3s;
}
[data-theme="dark"] {
    --bg-color: #0f172a;
    /* Deep slate background */
    --card-bg: #1e293b;
    /* Slightly lighter slate for cards */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --sidebar-bg: #0b1120;
    --sidebar-hover: #1e293b;
    --shadow-card: 0px 5px 15px rgba(0, 0, 0, 0.4);
}
/* Base Styles & Resets */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}
a:hover {
    color: var(--primary-hover);
}
/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-align: center;
    letter-spacing: 0.025em;
    gap: 0.5rem;
}
.btn:active {
    transform: scale(0.98);
}
.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 6px rgba(99, 102, 241, 0.25);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 12px rgba(99, 102, 241, 0.3);
    transform: translateY(-1px);
}
.btn-secondary {
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--bg-color);
    border-color: var(--text-secondary);
}
.btn-danger {
    background-color: var(--danger-color);
    color: #fff;
    box-shadow: 0 4px 6px rgba(239, 68, 68, 0.2);
}
.btn-danger:hover {
    background-color: #dc2626;
    box-shadow: 0 6px 12px rgba(239, 68, 68, 0.3);
    transform: translateY(-1px);
}
.btn-block {
    display: flex;
    width: 100%;
}
.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    border-radius: var(--border-radius-sm);
}
/* Input Forms */
.form-group {
    margin-bottom: 1.25rem;
}
.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}
.input-group input,
.input-group select,
.input-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    transition: all 0.2s ease;
}
[data-theme="dark"] .input-group input,
[data-theme="dark"] .input-group select,
[data-theme="dark"] .input-group textarea {
    background-color: rgba(0, 0, 0, 0.2);
}
.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
    background-color: var(--card-bg);
}
/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideInDown 0.4s ease-out;
}
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.alert-danger {
    background-color: var(--danger-light);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}
.alert-success {
    background-color: var(--secondary-light);
    color: var(--secondary-hover);
    border-left: 4px solid var(--secondary-color);
}
.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}
/* ---- Login Page Specific Overhaul ---- */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-color) 0%, #e0e7ff 100%);
}
[data-theme="dark"] .login-body {
    background: radial-gradient(circle at top left, #1e1b4b, var(--bg-color));
}
.login-container {
    width: 100%;
    max-width: 440px;
    padding: 1rem;
    z-index: 10;
}
.login-card {
    background-color: var(--card-bg);
    padding: 3rem 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg), 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}
.login-header h2 {
    font-size: 1.875rem;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}
.login-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}
/* ---- Dashboard Main Layout ---- */
.app-container {
    display: flex;
    min-height: 100vh;
}
/* Modern Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 40;
    box-shadow: var(--shadow-lg);
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
}
.sidebar-header {
    padding: 1.5rem;
    font-size: 1.25rem;
    font-weight: 800;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    color: #fff;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.sidebar-menu {
    flex: 1;
    padding: 1.5rem 0.75rem;
    list-style: none;
    overflow-y: auto;
}
.sidebar-menu li {
    margin-bottom: 0.25rem;
}
.sidebar-menu li a {
    display: flex;
    align-items: center;
    padding: 0.875rem 1.25rem;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.95rem;
}
.sidebar-menu li a:hover {
    background-color: var(--sidebar-hover);
    color: #fff;
    transform: translateX(4px);
}
.sidebar-menu li.active a {
    background-color: var(--sidebar-active-bg);
    color: var(--sidebar-active-text);
    box-shadow: inset 3px 0 0 var(--primary-color);
}
/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    margin-left: 260px;
    /* Offset for fixed sidebar */
    transition: margin-left 0.3s ease;
}
/* Glassmorphism Topbar */
.topbar {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 30;
}
[data-theme="dark"] .topbar {
    background-color: rgba(30, 41, 59, 0.8);
}
.topbar-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}
.topbar-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.35rem 1rem;
    background: var(--bg-color);
    border-radius: 9999px;
    border: 1px solid var(--border-color);
}
.content-area {
    padding: 2.5rem;
    flex: 1;
}
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}
.page-header h2 {
    font-size: 1.8rem;
    margin: 0;
}
/* Enhanced Cards & Widgets */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}
.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.widget-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.widget-value {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}
.widget-value.income {
    color: var(--secondary-color);
}
.widget-value.expense {
    color: var(--danger-color);
}
/* Accent lines top of generic cards */
.dashboard-grid .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #a855f7);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.dashboard-grid .card:hover::before {
    opacity: 1;
}
/* Enhanced Tables */
.table-container {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow-x: auto;
    box-shadow: var(--shadow-card);
}
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}
th,
td {
    padding: 1.25rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
th {
    background-color: var(--bg-color);
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
/* Fix rounding for table header corners */
th:first-child {
    border-top-left-radius: var(--border-radius-lg);
}
th:last-child {
    border-top-right-radius: var(--border-radius-lg);
}
tbody tr {
    transition: background-color 0.2s ease;
}
tbody tr:hover {
    background-color: var(--bg-color);
}
/* Badges */
.badge {
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: inline-block;
}
.badge-active {
    background-color: var(--secondary-light);
    color: var(--secondary-hover);
}
.badge-disabled {
    background-color: var(--danger-light);
    color: var(--danger-color);
}
/* Responsive Settings */
@media (max-width: 1024px) {
    .main-content {
        margin-left: 0;
    }
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .content-area {
        padding: 1.5rem;
    }
    #sidebarClose {
        display: block !important;
    }
    /* Subtle overlay when sidebar is open on mobile */
    .sidebar.open::after {
        content: '';
        position: fixed;
        top: 0;
        right: -100vw;
        bottom: 0;
        width: 100vw;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }
}
@media (max-width: 640px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .topbar {
        padding: 1rem;
    }
    .page-header h2 {
        font-size: 1.5rem;
    }
    .widget-value {
        font-size: 1.8rem;
    }
}
/* Fancy Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}