:root {
    /* Colors - Premium Palette */
    --primary-hue: 250;
    --secondary-hue: 175;

    --primary-50: hsl(var(--primary-hue), 95%, 95%);
    --primary-100: hsl(var(--primary-hue), 95%, 90%);
    --primary-200: hsl(var(--primary-hue), 90%, 80%);
    --primary-300: hsl(var(--primary-hue), 85%, 70%);
    --primary-400: hsl(var(--primary-hue), 80%, 60%);
    --primary-500: hsl(var(--primary-hue), 75%, 50%);
    --primary-600: hsl(var(--primary-hue), 75%, 40%);
    --primary-700: hsl(var(--primary-hue), 80%, 30%);
    --primary-800: hsl(var(--primary-hue), 85%, 20%);

    --secondary-50: hsl(var(--secondary-hue), 80%, 95%);
    --secondary-100: hsl(var(--secondary-hue), 80%, 90%);
    --secondary-200: hsl(var(--secondary-hue), 75%, 80%);
    --secondary-300: hsl(var(--secondary-hue), 70%, 65%);
    --secondary-400: hsl(var(--secondary-hue), 65%, 50%);
    --secondary-500: hsl(var(--secondary-hue), 70%, 40%);
    --secondary-600: hsl(var(--secondary-hue), 75%, 30%);

    --success: hsl(145, 65%, 50%);
    --warning: hsl(40, 95%, 55%);
    --error: hsl(0, 75%, 60%);
    --info: hsl(200, 85%, 55%);

    /* Dark Theme Base */
    --background: hsl(240, 20%, 8%);
    --background-elevated: hsl(240, 18%, 12%);
    --background-card: hsl(240, 16%, 15%);
    --background-hover: hsl(240, 15%, 18%);

    --surface: hsl(240, 10%, 20%);
    --surface-variant: hsl(240, 8%, 25%);

    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(0, 0%, 75%);
    --text-tertiary: hsl(0, 0%, 55%);
    --text-disabled: hsl(0, 0%, 40%);

    --border: hsl(240, 10%, 25%);
    --border-light: hsl(240, 8%, 30%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg,
            hsl(var(--primary-hue), 80%, 55%),
            hsl(calc(var(--primary-hue) + 20), 75%, 50%));
    --gradient-secondary: linear-gradient(135deg,
            hsl(var(--secondary-hue), 70%, 50%),
            hsl(calc(var(--secondary-hue) + 30), 75%, 45%));
    --gradient-accent: linear-gradient(135deg,
            hsl(280, 85%, 60%),
            hsl(320, 90%, 55%));

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(var(--primary-hue), 80%, 60%, 0.4);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Outfit', var(--font-sans);

    --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: 2rem;
    --font-size-4xl: 2.5rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, hsl(var(--primary-hue), 50%, 15%), transparent 40%),
        radial-gradient(circle at 80% 70%, hsl(var(--secondary-hue), 40%, 12%), transparent 40%),
        radial-gradient(circle at 50% 50%, hsl(280, 35%, 10%), transparent 60%);
    opacity: 0.6;
    z-index: -1;
    animation: backgroundPulse 20s ease-in-out infinite;
}

@keyframes backgroundPulse {

    0%,
    100% {
        opacity: 0.6;
    }

    50% {
        opacity: 0.8;
    }
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--border);
    border-top-color: var(--primary-500);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

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

.loading-content h2 {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.main-nav {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

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

.brand-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-400);
}

.brand-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--spacing-sm);
    flex: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.nav-link svg {
    width: 18px;
    height: 18px;
}

.nav-link:hover {
    background: var(--background-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

.nav-link.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 0 20px hsla(var(--primary-hue), 80%, 60%, 0.3);
}

.nav-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-xl);
}

/* Views */
.view {
    display: none;
    animation: fadeIn var(--transition-base);
}

.view.active {
    display: block;
}

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

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

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-2xl);
    gap: var(--spacing-lg);
}

.view-title {
    font-family: var(--font-display);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.view-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

.view-content {
    display: grid;
    gap: var(--spacing-xl);
}

/* Buttons */
.btn,
.btn-icon {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn svg {
    width: 18px;
    height: 18px;
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px hsla(var(--primary-hue), 80%, 60%, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 16px hsla(var(--primary-hue), 80%, 60%, 0.4);
    transform: translateY(-2px);
}

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

.btn-secondary {
    background: var(--background-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--background-hover);
    border-color: var(--border-light);
}

.btn-icon {
    padding: var(--spacing-md);
    background: var(--background-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-icon:hover {
    background: var(--background-hover);
    color: var(--text-primary);
    border-color: var(--primary-400);
}

.button-group {
    display: flex;
    gap: var(--spacing-md);
}

/* Cards */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-500);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
}

.card-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.card-body {
    color: var(--text-secondary);
}

.card-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.form-label.required::after {
    content: '*';
    color: var(--error);
    margin-left: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--background-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), 80%, 60%, 0.2);
}

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

.form-help {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background: hsla(var(--primary-hue), 80%, 60%, 0.2);
    color: var(--primary-300);
}

.badge-success {
    background: hsla(145, 65%, 50%, 0.2);
    color: hsl(145, 65%, 60%);
}

.badge-warning {
    background: hsla(40, 95%, 55%, 0.2);
    color: hsl(40, 95%, 65%);
}

.badge-error {
    background: hsla(0, 75%, 60%, 0.2);
    color: hsl(0, 75%, 70%);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-cols-1 {
    grid-template-columns: repeat(1, 1fr);
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: var(--z-modal-backdrop);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    animation: fadeIn var(--transition-base);
}

.modal {
    background: var(--background-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-2xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp var(--transition-base);
}

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

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

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.modal-close:hover {
    background: var(--background-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: var(--z-tooltip);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    background: var(--background-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    min-width: 300px;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    animation: slideInRight var(--transition-base);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }

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

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.toast-success {
    border-left: 4px solid var(--success);
}

.toast-warning {
    border-left: 4px solid var(--warning);
}

.toast-error {
    border-left: 4px solid var(--error);
}

.toast-info {
    border-left: 4px solid var(--info);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-container {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .brand-title {
        font-size: var(--font-size-lg);
    }

    .nav-links {
        gap: var(--spacing-xs);
    }

    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-xs);
    }

    .nav-link span {
        display: none;
    }

    .main-content {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .view-header {
        flex-direction: column;
        align-items: stretch;
    }

    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .nav-brand {
        gap: var(--spacing-sm);
    }

    .brand-icon {
        width: 24px;
        height: 24px;
    }

    .nav-actions {
        display: none;
    }

    .view-title {
        font-size: var(--font-size-2xl);
    }

    .view-subtitle {
        font-size: var(--font-size-base);
    }

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .modal {
        max-width: 100%;
        border-radius: var(--radius-xl);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-left {
    text-align: left;
}

.mt-0 {
    margin-top: 0;
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

.mb-0 {
    margin-bottom: 0;
}

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

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-sm {
    gap: var(--spacing-sm);
}

.gap-md {
    gap: var(--spacing-md);
}

.gap-lg {
    gap: var(--spacing-lg);
}

.hidden {
    display: none !important;
}

.invisible {
    visibility: hidden !important;
}