/* Modern Design System */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #1e293b;
    --bg-sidebar: #0f172a;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;
    
    /* Borders */
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Base Styles */
html, body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    margin: 0;
    padding: 0;
    height: 100%;
}

* {
    box-sizing: border-box;
}

/* Links and Buttons */
a, .btn-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover, .btn-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.btn-primary {
    color: var(--text-white);
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
    transition: var(--transition-fast);
    border: 1px solid transparent;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--primary-color);
    outline: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

h1:focus {
    outline: none;
}

/* Form Validation */
.valid.modified:not([type=checkbox]) {
    outline: 1px solid var(--success-color);
    border-color: var(--success-color);
}

.invalid {
    outline: 1px solid var(--error-color);
    border-color: var(--error-color);
}

.validation-message {
    color: var(--error-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* Layout Components */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar-container {
    width: 280px;
    background: linear-gradient(180deg, var(--bg-sidebar) 0%, #0f1629 100%);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
}

.sidebar-container.collapsed {
    width: 70px;
}

.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: var(--transition-normal);
}

.main-container.expanded {
    margin-left: 0;
}

/* Header */
.app-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 999;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    height: 70px;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    display: none;
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.app-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

.header-link:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
    text-decoration: none;
}

/* Main Content */
.main-content {
    flex: 1;
    overflow: auto;
    background: var(--bg-secondary);
}

.content-wrapper {
    padding: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

/* Sidebar Header */
.sidebar-header {
    padding: var(--spacing-xl) var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.brand-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.brand-logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0;
    color: var(--text-white);
}

.brand-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin: 0;
}

/* Navigation */
.nav-scrollable {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-section {
    margin-bottom: var(--spacing-sm);
}

.nav-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.nav-item {
    margin: 0 var(--spacing-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    text-decoration: none;
    transform: translateX(4px);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--accent-color);
}

.nav-icon {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-md);
}

.nav-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar-container {
        position: fixed;
        left: -280px;
        top: 0;
        height: 100vh;
        z-index: 1001;
    }
    
    .sidebar-container.show {
        left: 0;
    }
    
    .main-container {
        width: 100%;
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .app-title {
        font-size: var(--font-size-lg);
    }
    
    .content-wrapper {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: var(--spacing-md);
    }
    
    .app-title {
        display: none;
    }
    
    .header-actions {
        gap: var(--spacing-sm);
    }
}

/* Error UI */
.blazor-error-boundary {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
    color: var(--text-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin: var(--spacing-md);
}

.error-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.error-content i {
    font-size: var(--font-size-xl);
    color: var(--text-white);
}

.error-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-left: auto;
}

.error-actions .reload,
.error-actions .dismiss {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
}

.error-actions .reload:hover,
.error-actions .dismiss:hover {
    background: rgba(255, 255, 255, 0.3);
    text-decoration: none;
}

/* Form Controls */
.darker-border-checkbox.form-check-input {
    border-color: var(--border-color);
}

.form-floating > .form-control-plaintext::placeholder, 
.form-floating > .form-control::placeholder {
    color: var(--text-muted);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, 
.form-floating > .form-control:focus::placeholder {
    text-align: start;
}

/* Advanced Sidebar Enhancements */
.sidebar-container {
    position: relative;
}

.sidebar-container::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 100%;
    background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.1) 50%, transparent 100%);
}

.nav-section {
    position: relative;
    animation: fadeInUp 0.3s ease-out;
}

.nav-section:nth-child(1) { animation-delay: 0.1s; }
.nav-section:nth-child(2) { animation-delay: 0.2s; }
.nav-section:nth-child(3) { animation-delay: 0.3s; }
.nav-section:nth-child(4) { animation-delay: 0.4s; }

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

.nav-section-title {
    position: relative;
    overflow: hidden;
}

.nav-section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.2) 50%, transparent 100%);
}

.nav-link {
    backdrop-filter: blur(10px);
}

.nav-link::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: var(--transition-fast);
    border-radius: var(--radius-lg);
}

.nav-link:hover::after {
    opacity: 1;
}

.nav-link:hover .nav-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.3));
}

.nav-link:hover .nav-text {
    transform: translateX(2px);
}

.nav-icon {
    transition: var(--transition-fast);
    position: relative;
    z-index: 1;
}

.nav-text {
    transition: var(--transition-fast);
    position: relative;
    z-index: 1;
}

.nav-link.active {
    position: relative;
    overflow: hidden;
}

.nav-link.active::after {
    opacity: 1;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.05));
}

.nav-link.active .nav-icon {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Collapsed Sidebar Styles */
.sidebar-container.collapsed .brand-text,
.sidebar-container.collapsed .nav-text,
.sidebar-container.collapsed .nav-section-title span {
    opacity: 0;
    transform: translateX(-20px);
    transition: var(--transition-fast);
}

.sidebar-container.collapsed .nav-section-title i {
    margin-right: 0;
}

.sidebar-container.collapsed .nav-link {
    justify-content: center;
    padding: var(--spacing-md);
}

.sidebar-container.collapsed .nav-icon {
    margin-right: 0;
}

/* Scrollbar Styling */
.nav-scrollable::-webkit-scrollbar {
    width: 4px;
}

.nav-scrollable::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
}

.nav-scrollable::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.nav-scrollable::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Brand Logo Animation */
.brand-logo {
    position: relative;
    overflow: hidden;
}

.brand-logo::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

.brand-logo:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(37, 99, 235, 0.3);
}

/* Header Enhancements */
.app-header {
    backdrop-filter: blur(10px);
    background: rgba(248, 250, 252, 0.95);
}

.sidebar-toggle {
    position: relative;
    overflow: hidden;
}

.sidebar-toggle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--primary-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: var(--transition-fast);
    opacity: 0.1;
}

.sidebar-toggle:hover::before {
    width: 100%;
    height: 100%;
}

/* Content Area Enhancements */
.content-wrapper {
    animation: fadeIn 0.5s ease-out;
}

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

/* Navbar Toggler (Hidden) */
.navbar-toggler {
    display: none;
}

/* Loading States */
.nav-link.loading {
    pointer-events: none;
    opacity: 0.6;
}

.nav-link.loading .nav-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}