/* Dark Mode Design System - Complete Redesign */
/* System fonts first for instant render */

:root {
    /* Dark Mode Color Palette */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Dark Surfaces */
    --surface-base: #0f172a;
    --surface-raised: #1e293b;
    --surface-alt: #334155;
    --surface-muted: rgba(51, 65, 85, 0.5);
    --surface-elevated: #475569;
    
    /* Dark Text */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-on-primary: #ffffff;
    
    /* Dark Borders */
    --border-color: rgba(51, 65, 85, 0.8);
    --border-light: rgba(51, 65, 85, 0.4);
    
    /* Shadows - Dark Mode Optimized */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.6);
    
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Layout */
    --header-height: 64px;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Inter', sans-serif;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--surface-base);
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--surface-base);
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
}

img, svg {
    display: block;
    max-width: 100%;
    height: auto;
}

button {
    font: inherit;
    border: none;
    background: none;
    cursor: pointer;
    padding: 0;
}

input, textarea, select {
    font: inherit;
    color: inherit;
}

a {
    color: var(--primary-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-500);
}

::selection {
    background: rgba(59, 130, 246, 0.3);
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

p {
    margin: 0;
    color: var(--text-secondary);
}

small {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* Buttons - Dark Mode */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.9375rem;
    line-height: 1;
    transition: all var(--transition-base);
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--primary-600);
    color: var(--text-on-primary);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--primary-500);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-xs);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary-500);
    color: var(--primary-400);
    background: var(--surface-alt);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

.btn i {
    font-size: 0.875rem;
}

.btn-loading {
    opacity: 0.7;
    cursor: wait;
    pointer-events: none;
}

/* Form Controls - Dark Mode */
label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

label i {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

input, textarea, select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--surface-alt);
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

input:hover, textarea:hover, select:hover {
    border-color: var(--slate-600);
    background: var(--surface-elevated);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-500);
    background: var(--surface-elevated);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

input::placeholder, textarea::placeholder {
    color: var(--text-tertiary);
}

textarea {
    min-height: 100px;
    resize: vertical;
    font-family: inherit;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-helper {
    display: block;
    margin-top: 0.375rem;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* Alerts - Dark Mode */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    border-radius: var(--radius-md);
    border-left: 3px solid currentColor;
    background: var(--surface-raised);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    box-shadow: var(--shadow-xs);
}

.alert i {
    font-size: 1rem;
    margin-top: 0.125rem;
    flex-shrink: 0;
}

.alert-success {
    color: var(--success);
    border-left-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.alert-error {
    color: var(--error);
    border-left-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.alert-warning {
    color: var(--warning);
    border-left-color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.alert-info {
    color: var(--info);
    border-left-color: var(--info);
    background: rgba(59, 130, 246, 0.1);
}

/* Scrollbar - Dark Mode */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-base);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-alt);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--surface-elevated);
}

/* Login Page - Dark Mode */
.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    position: relative;
}

#particles-js {
    position: absolute;
    inset: 0;
    opacity: 0.2;
    display: none;
    z-index: 1;
}

@media (min-width: 769px) {
    #particles-js {
        display: block;
    }
}

.login-container {
    position: relative;
    width: 100%;
    max-width: 420px;
    z-index: 2;
}

.login-card {
    background: var(--surface-raised);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.login-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.login-header i {
    display: inline-flex;
    width: 64px;
    height: 64px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: var(--text-on-primary);
    font-size: 1.75rem;
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-md);
}

.login-header h1 {
    font-size: 1.75rem;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.login-header p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.login-form .form-group {
    gap: var(--space-2);
}

.login-footer {
    text-align: center;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-color);
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* Reduced Motion Support */
body.reduced-motion *,
body.reduced-motion *::before,
body.reduced-motion *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.15s !important;
    transition-delay: 0s !important;
}

body.reduced-motion #particles-js {
    display: none !important;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    #particles-js {
        display: none !important;
    }
    
    .login-card {
        padding: var(--space-6);
        box-shadow: var(--shadow-sm);
    }
    
    .btn-primary:hover,
    .btn-outline:hover {
        transform: none !important;
    }
}

@media (max-width: 640px) {
    .login-body {
        padding: var(--space-3);
    }
    
    .login-card {
        padding: var(--space-5);
    }
    
    .login-header i {
        width: 56px;
        height: 56px;
        font-size: 1.5rem;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}