/* ============================================
   DarCare - Modern UI/UX Enhancements
   Complete Design System Revamp
   Version: 2025-01-19
   ============================================ */

/* Enhanced Design System Variables */
:root {
    /* Modern Color Palette - Enhanced */
    --color-primary: #9C27B0;
    --color-primary-dark: #7B1FA2;
    --color-primary-light: #E1BEE7;
    --color-primary-lighter: #F3E5F5;
    
    /* Semantic Colors */
    --color-success: #10B981;
    --color-success-dark: #059669;
    --color-warning: #F59E0B;
    --color-warning-dark: #D97706;
    --color-error: #EF4444;
    --color-error-dark: #DC2626;
    --color-info: #3B82F6;
    --color-info-dark: #2563EB;
    
    /* Neutral Colors - Enhanced */
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Text Colors */
    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --text-tertiary: var(--color-gray-500);
    --text-inverse: #FFFFFF;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: var(--color-gray-50);
    --bg-tertiary: var(--color-gray-100);
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    /* Border Colors */
    --border-color: var(--color-gray-200);
    --border-color-hover: var(--color-gray-300);
    --border-color-focus: var(--color-primary);
    
    /* Enhanced Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-colored: 0 10px 25px -5px rgba(156, 39, 176, 0.3);
    
    /* Enhanced Spacing Scale */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    
    /* Enhanced Border Radius */
    --radius-none: 0;
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-2xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;
    
    /* Enhanced Typography Scale */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    --font-size-5xl: 3rem;       /* 48px */
    
    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Line Heights */
    --line-height-none: 1;
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Enhanced 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);
    --transition-bounce: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-Index Scale */
    --z-base: 0;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
    
    /* Breakpoints (for reference) */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

/* ============================================
   Enhanced No Data / Empty States
   ============================================ */

.no-results-modern,
.empty-state-modern {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    padding: var(--space-8) var(--space-4);
    text-align: center;
    animation: fadeInUp 0.5s ease-out;
}

.no-results-content,
.empty-state-content {
    max-width: 500px;
    width: 100%;
}

.no-results-icon-modern,
.empty-state-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-lighter), var(--color-primary-light));
    border-radius: 50%;
    color: var(--color-primary);
    font-size: 3.5rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

.no-results-icon-modern::before,
.empty-state-icon::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    opacity: 0.2;
    z-index: -1;
    animation: pulse 2s ease-in-out infinite;
}

.no-results-title,
.empty-state-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0 0 var(--space-3) 0;
    line-height: var(--line-height-tight);
}

.no-results-description,
.empty-state-description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin: 0 0 var(--space-6) 0;
    line-height: var(--line-height-relaxed);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.no-results-modern .btn,
.empty-state-modern .btn {
    min-height: 48px;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.no-results-modern .btn:hover,
.empty-state-modern .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Empty State Variants */
.empty-state-compact {
    min-height: 300px;
    padding: var(--space-6);
}

.empty-state-compact .empty-state-icon {
    width: 80px;
    height: 80px;
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.empty-state-compact .empty-state-title {
    font-size: var(--font-size-xl);
}

.empty-state-compact .empty-state-description {
    font-size: var(--font-size-sm);
}

/* ============================================
   Enhanced Card Components
   ============================================ */

.card-modern {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    padding: var(--space-6);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.card-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.card-modern:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--border-color-hover);
}

.card-modern:hover::before {
    transform: scaleX(1);
}

.card-modern-interactive {
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.card-modern-interactive:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.card-modern-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-color);
}

.card-modern-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
    line-height: var(--line-height-tight);
}

.card-modern-body {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

.card-modern-footer {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
}

/* ============================================
   Enhanced Button Components
   ============================================ */

.btn-modern {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-none);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 48px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}

.btn-modern::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.2);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn-modern:hover::before {
    opacity: 1;
}

.btn-modern:active {
    transform: scale(0.98);
}

.btn-modern:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-modern-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-modern-primary:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

.btn-modern-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color-hover);
}

.btn-modern-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-modern-outline:hover {
    background: var(--color-primary);
    color: var(--text-inverse);
}

.btn-modern-ghost {
    background: transparent;
    color: var(--text-primary);
    box-shadow: none;
}

.btn-modern-ghost:hover {
    background: var(--bg-secondary);
}

/* Button Sizes */
.btn-modern-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-modern-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
    min-height: 56px;
}

/* ============================================
   Enhanced Form Components
   ============================================ */

.form-group-modern {
    margin-bottom: var(--space-5);
}

.form-label-modern {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: var(--line-height-normal);
}

.form-input-modern,
.form-select-modern,
.form-textarea-modern {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    min-height: 48px;
    -webkit-appearance: none;
    appearance: none;
}

.form-input-modern:focus,
.form-select-modern:focus,
.form-textarea-modern:focus {
    outline: none;
    border-color: var(--border-color-focus);
    box-shadow: 0 0 0 3px rgba(156, 39, 176, 0.1);
}

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

.form-hint-modern {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-1);
    line-height: var(--line-height-normal);
}

.form-error-modern {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--space-1);
    line-height: var(--line-height-normal);
}

/* ============================================
   Enhanced Status Badges
   ============================================ */

.badge-modern {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    line-height: var(--line-height-none);
    white-space: nowrap;
}

.badge-modern-success {
    background: var(--color-success);
    color: var(--text-inverse);
}

.badge-modern-warning {
    background: var(--color-warning);
    color: var(--text-inverse);
}

.badge-modern-error {
    background: var(--color-error);
    color: var(--text-inverse);
}

.badge-modern-info {
    background: var(--color-info);
    color: var(--text-inverse);
}

.badge-modern-primary {
    background: var(--color-primary);
    color: var(--text-inverse);
}

/* ============================================
   Enhanced Loading States
   ============================================ */

.loading-modern {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
    gap: var(--space-4);
}

.loading-spinner-modern {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text-modern {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

/* Skeleton Loading */
.skeleton-modern {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-100) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-modern-text {
    height: 1em;
    margin-bottom: var(--space-2);
    border-radius: var(--radius-sm);
}

.skeleton-modern-title {
    height: 1.5em;
    width: 70%;
    margin-bottom: var(--space-4);
    border-radius: var(--radius-sm);
}

.skeleton-modern-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.2;
        transform: scale(1);
    }
    50% {
        opacity: 0.3;
        transform: scale(1.05);
    }
}

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

/* ============================================
   Enhanced Container & Layout
   ============================================ */

.container-enhanced {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) {
    .container-enhanced {
        max-width: 640px;
        padding: 0 var(--space-6);
    }
}

@media (min-width: 768px) {
    .container-enhanced {
        max-width: 768px;
        padding: 0 var(--space-8);
    }
}

@media (min-width: 1024px) {
    .container-enhanced {
        max-width: 1024px;
        padding: 0 var(--space-10);
    }
}

@media (min-width: 1280px) {
    .container-enhanced {
        max-width: 1280px;
        padding: 0 var(--space-12);
    }
}

@media (min-width: 1536px) {
    .container-enhanced {
        max-width: 1536px;
    }
}

/* Section Headers - Enhanced */
.section-header-modern {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-color);
}

.section-title-modern {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
    line-height: var(--line-height-tight);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.section-subtitle-modern {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin: var(--space-1) 0 0 0;
    line-height: var(--line-height-normal);
}

/* ============================================
   Responsive Enhancements
   ============================================ */

@media (max-width: 768px) {
    .no-results-modern,
    .empty-state-modern {
        min-height: 40vh;
        padding: var(--space-6) var(--space-4);
    }
    
    .no-results-icon-modern,
    .empty-state-icon {
        width: 100px;
        height: 100px;
        font-size: 3rem;
        margin-bottom: var(--space-5);
    }
    
    .no-results-title,
    .empty-state-title {
        font-size: var(--font-size-xl);
    }
    
    .no-results-description,
    .empty-state-description {
        font-size: var(--font-size-sm);
    }
    
    .card-modern {
        padding: var(--space-4);
    }
    
    .btn-modern {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .no-results-icon-modern,
    .empty-state-icon {
        width: 80px;
        height: 80px;
        font-size: 2.5rem;
    }
    
    .no-results-title,
    .empty-state-title {
        font-size: var(--font-size-lg);
    }
    
    .section-header-modern {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .section-title-modern {
        font-size: var(--font-size-xl);
    }
}

/* Tablet Enhancements */
@media (min-width: 768px) and (max-width: 1023px) {
    .card-modern {
        padding: var(--space-5);
    }
    
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Desktop Enhancements */
@media (min-width: 1024px) {
    .card-modern {
        padding: var(--space-6);
    }
    
    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .no-results-modern,
    .empty-state-modern {
        min-height: 60vh;
    }
}

/* ============================================
   Accessibility Enhancements
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--text-inverse);
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: var(--z-toast);
    border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   RTL Support Enhancements
   ============================================ */

body.rtl .no-results-modern,
body.rtl .empty-state-modern {
    direction: rtl;
}

body.rtl .card-modern-header,
body.rtl .card-modern-footer {
    flex-direction: row-reverse;
}

body.rtl .btn-modern {
    direction: rtl;
}

body.rtl .form-label-modern,
body.rtl .form-input-modern,
body.rtl .form-select-modern,
body.rtl .form-textarea-modern {
    text-align: right;
}

body.rtl .section-header-modern {
    flex-direction: row-reverse;
}

body.rtl .section-title-modern {
    flex-direction: row-reverse;
}

body.rtl .loading-modern {
    direction: rtl;
}

body.rtl .badge-modern {
    direction: rtl;
}

/* RTL: Keep numbers and currency LTR */
body.rtl .stat-value,
body.rtl .stat-value-mini,
body.rtl .price-value,
body.rtl input[type="number"],
body.rtl input[type="date"],
body.rtl input[type="time"] {
    direction: ltr;
    text-align: left;
}

/* RTL: Keep icons in correct direction */
body.rtl .btn-modern i,
body.rtl .card-modern i,
body.rtl .badge-modern i {
    direction: ltr;
}

/* ============================================
   Enhanced Accessibility
   ============================================ */

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--text-inverse);
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    z-index: var(--z-toast);
    border-radius: 0 0 var(--radius-md) 0;
    font-weight: var(--font-weight-semibold);
    transition: top var(--transition-fast);
}

.skip-to-main:focus {
    top: 0;
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Enhanced focus states */
.btn-modern:focus-visible,
.card-modern-interactive:focus-visible,
.form-input-modern:focus-visible,
.form-select-modern:focus-visible,
.form-textarea-modern:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-md);
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card-modern {
        border: 2px solid var(--text-primary);
    }
    
    .btn-modern {
        border: 2px solid currentColor;
    }
    
    .form-input-modern,
    .form-select-modern,
    .form-textarea-modern {
        border: 2px solid var(--text-primary);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .no-results-icon-modern,
    .empty-state-icon {
        animation: none !important;
    }
}

/* Print styles */
@media print {
    .no-results-modern,
    .empty-state-modern {
        min-height: auto;
        padding: var(--space-4);
    }
    
    .btn-modern {
        display: none;
    }
    
    .card-modern {
        box-shadow: none;
        border: 1px solid var(--border-color);
        page-break-inside: avoid;
    }
}