:root {
    /* Base Colors - Clean, Modern Slate */
    --bg-primary: #f3f4f6;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f8fafc;
    
    /* Primary Accent - Ocean Blue */
    --accent-color: #0284c7;
    --accent-hover: #0369a1;
    --accent-light: rgba(2, 132, 199, 0.1);
    --accent-glow: rgba(2, 132, 199, 0.25);
    
    /* Sidebar Deep Navy Theme Colors */
    --sidebar-bg: #082f49;
    --sidebar-hover: #0c4a6e;
    --sidebar-text: #bae6fd;
    --sidebar-text-active: #ffffff;
    --sidebar-border: #0c4a6e;
    
    /* Text Colors - High Contrast Slate */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    /* Borders */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --border-focus: #818cf8;
    
    /* Semantic Colors */
    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;
    
    --error: #ef4444;
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;
    
    /* Design Tokens */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
    --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 20px;
    
    /* Premium Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Glassmorphism / Card Panel */
.glass-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
}

.glass-panel:hover {
    box-shadow: var(--shadow-lg);
}

/* -------------------------------------
   Auth / Login Page Layout 
-------------------------------------- */
.auth-container {
    display: flex;
    min-height: 100vh;
    background-color: #0f172a;
}

.auth-split-image {
    flex: 1;
    background: linear-gradient(135deg, rgba(2, 132, 199, 0.85) 0%, rgba(15, 23, 42, 0.95) 100%), url('https://images.unsplash.com/photo-1580273916550-e323be2ae537?q=80&w=1920&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
    display: none;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

@media (min-width: 992px) {
    .auth-split-image {
        display: flex;
    }
}

.auth-image-content {
    color: white;
    text-align: center;
    z-index: 1;
    padding: 0 40px;
    animation: slideUp 0.8s ease-out forwards;
}

.auth-image-content h2 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: #ffffff;
    letter-spacing: -1px;
}

.auth-image-content p {
    font-size: 1.25rem;
    opacity: 0.9;
    font-weight: 300;
}

.auth-form-wrapper {
    flex: 1;
    max-width: 500px;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 48px;
    background: #ffffff;
    animation: slideInRight 0.5s ease-out forwards;
}

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

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

@media (min-width: 992px) {
    .auth-form-wrapper {
        flex: none;
        width: 500px;
    }
}

.auth-header {
    text-align: left;
    margin-bottom: 40px;
}

.auth-header h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.auth-header p {
    color: #64748b;
    font-size: 1rem;
}

/* Auth specific form inputs */
.auth-form-wrapper .form-control {
    padding: 14px 16px;
    font-size: 1rem;
    border-radius: 12px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
}

.auth-form-wrapper .form-control:focus {
    background: #ffffff;
    border-color: #0ea5e9;
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1);
}

.auth-form-wrapper .btn-primary {
    padding: 14px 24px;
    font-size: 1.05rem;
    border-radius: 12px;
    background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
}

.auth-form-wrapper .btn-primary:hover {
    box-shadow: 0 6px 20px rgba(2, 132, 199, 0.4);
    transform: translateY(-2px);
}

/* -------------------------------------
   Form Styles 
-------------------------------------- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.form-row-checkbox {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.form-row-checkbox label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-weight: 500;
}

.form-row-checkbox input[type="checkbox"] {
    accent-color: var(--accent-color);
    width: 16px;
    height: 16px;
    cursor: pointer;
    border-radius: 4px;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* -------------------------------------
   Buttons 
-------------------------------------- */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-smooth);
    gap: 8px;
    font-family: var(--font-heading);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    color: #ffffff;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--accent-glow);
    filter: brightness(1.05);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

/* -------------------------------------
   Alert Notifications 
-------------------------------------- */
.alert {
    padding: 14px 18px;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    margin-bottom: 24px;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.alert-danger {
    background-color: var(--error-bg);
    border-color: var(--error-border);
    color: #b91c1c;
}

.alert-success {
    background-color: var(--success-bg);
    border-color: var(--success-border);
    color: #047857;
}

/* -------------------------------------
   App Shell Layout & Sidebar Dark Theme
-------------------------------------- */
.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 270px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 10;
}

.sidebar-brand {
    padding: 28px 24px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.5px;
    margin: 0;
}

.sidebar-brand svg {
    color: var(--accent-color);
}

.sidebar-nav {
    flex: 1;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.nav-item:hover {
    color: var(--sidebar-text-active);
    background-color: var(--sidebar-hover);
}

.nav-item.active {
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    font-weight: 600;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.nav-item svg {
    color: inherit;
    opacity: 0.8;
}
.nav-item.active svg {
    opacity: 1;
}

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--sidebar-bg);
}

.user-profile-info {
    display: flex;
    flex-direction: column;
}

.user-profile-name {
    font-weight: 600;
    color: #ffffff;
    font-size: 0.95rem;
}

.user-profile-role {
    color: var(--sidebar-text);
    font-size: 0.8rem;
    font-weight: 500;
}

.logout-icon-btn {
    color: var(--sidebar-text);
    cursor: pointer;
    background: var(--sidebar-hover);
    border: 1px solid transparent;
    transition: var(--transition-smooth);
    padding: 10px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logout-icon-btn:hover {
    color: #ffffff;
    background: var(--error);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.main-content {
    margin-left: 270px;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-nav {
    height: 72px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 5;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.content-body {
    padding: 40px;
    flex: 1;
}

/* -------------------------------------
   Tables & Data Presentation 
-------------------------------------- */
.table-container {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    margin-top: 24px;
    box-shadow: var(--shadow-md);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

.data-table th {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    position: sticky;
    top: 0;
    z-index: 2;
}

.data-table td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

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

.data-table tr {
    transition: var(--transition-smooth);
}

.data-table tr:hover td {
    background-color: var(--bg-primary); /* slight highlight */
}

/* -------------------------------------
   Badges 
-------------------------------------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.025em;
}

.badge-success {
    background-color: var(--success-bg);
    color: #065f46;
    border: 1px solid var(--success-border);
}

.badge-danger {
    background-color: var(--error-bg);
    color: #991b1b;
    border: 1px solid var(--error-border);
}

.badge-warning {
    background-color: var(--warning-bg);
    color: #92400e;
    border: 1px solid var(--warning-border);
}

/* -------------------------------------
   Layout Helpers & Common 
-------------------------------------- */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.users-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 32px;
}

.link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.check-inline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.top-nav-right a {
    color: var(--accent-color);
    text-decoration: none;
    margin-left: 16px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}
.top-nav-right a:hover {
    color: var(--accent-hover);
}

/* Dashboard Cards (Reports) */
.report-card {
    padding: 24px;
    text-decoration: none;
    color: inherit;
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}

.report-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.report-card h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-primary);
}

.report-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* -------------------------------------
   Responsive 
-------------------------------------- */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
}
.mobile-menu-toggle:hover {
    background: var(--bg-tertiary);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 9;
    opacity: 0;
    transition: opacity 0.3s ease;
}

body.sidebar-open .sidebar-overlay {
    display: block;
    opacity: 1;
}

@media (max-width: 1024px) {
    .users-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    .mobile-menu-toggle {
        display: flex;
    }
    .sidebar {
        width: 270px;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 100;
    }
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .content-body {
        padding: 24px;
    }
    .toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .top-nav {
        padding: 0 24px;
    }
}