/* ============================================
   AI Team - Premium Design System
   ============================================ */

/* ============================================
   1. CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
    /* Primary Colors */
    --color-primary: #667eea;
    --color-primary-dark: #5568d3;
    --color-primary-light: #8b9bf5;
    --color-secondary: #764ba2;
    --color-accent: #f093fb;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --gradient-info: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warning: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-purple: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-black: #000000;
    --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;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-info: #3b82f6;
    --color-info-light: #dbeafe;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'Courier New', Consolas, Monaco, monospace;

    --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-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-2xl: 3rem;     /* 48px */
    --spacing-3xl: 4rem;     /* 64px */

    /* Border Radius */
    --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;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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-premium: 0 20px 60px rgba(102, 126, 234, 0.3);

    /* Glass Effects */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-blur: blur(10px);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;

    /* Z-Index */
    --z-dropdown: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
}

/* ============================================
   2. Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    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);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

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

/* ============================================
   3. Utility Classes
   ============================================ */

/* Animation Classes */
.animate-fade-in {
    animation: fadeIn var(--transition-base) forwards;
}

.animate-slide-in {
    animation: slideIn var(--transition-base) forwards;
}

.animate-slide-up {
    animation: slideUp var(--transition-base) forwards;
}

.animate-scale-in {
    animation: scaleIn var(--transition-base) forwards;
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* Glassmorphism */
.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
}

.glass-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-premium);
    border-radius: var(--radius-xl);
}

/* Gradient Backgrounds */
.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-secondary {
    background: var(--gradient-secondary);
}

.bg-gradient-success {
    background: var(--gradient-success);
}

.bg-gradient-info {
    background: var(--gradient-info);
}

.bg-gradient-warning {
    background: var(--gradient-warning);
}

/* ============================================
   4. Premium Components
   ============================================ */

/* Premium Card */
.premium-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
}

.premium-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-premium);
}

.premium-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-gray-100);
}

.premium-card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
}

.premium-card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-top: var(--spacing-xs);
}

.premium-card-body {
    color: var(--color-gray-700);
    line-height: var(--line-height-relaxed);
}

/* Premium Button */
.premium-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.premium-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.premium-btn:hover::before {
    transform: translateX(100%);
}

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

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

.premium-btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.premium-btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.premium-btn-secondary:hover {
    background: var(--color-gray-200);
}

.premium-btn-success {
    background: var(--gradient-success);
    color: white;
}

.premium-btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

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

.premium-btn-ghost:hover {
    background: var(--color-primary);
    color: white;
}

.premium-btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.premium-btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* Premium Input */
.premium-input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    color: var(--color-gray-900);
    background: white;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    outline: none;
}

.premium-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.premium-input::placeholder {
    color: var(--color-gray-400);
}

.premium-input-group {
    margin-bottom: var(--spacing-lg);
}

.premium-input-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.premium-input-helper {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    margin-top: var(--spacing-xs);
}

.premium-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Premium Select */
.premium-select {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    color: var(--color-gray-900);
    background: white;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    outline: none;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    padding-right: var(--spacing-2xl);
}

.premium-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

/* Premium Badge */
.premium-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: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.premium-badge-primary {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    color: var(--color-primary-dark);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.premium-badge-success {
    background: var(--color-success-light);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.premium-badge-warning {
    background: var(--color-warning-light);
    color: var(--color-warning);
    border: 1px solid var(--color-warning);
}

.premium-badge-error {
    background: var(--color-error-light);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.premium-badge-info {
    background: var(--color-info-light);
    color: var(--color-info);
    border: 1px solid var(--color-info);
}

/* Premium Alert */
.premium-alert {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    margin: var(--spacing-md) 0;
    animation: slideIn var(--transition-base);
}

.premium-alert-success {
    background: var(--color-success-light);
    border-color: var(--color-success);
    color: #065f46;
}

.premium-alert-error {
    background: var(--color-error-light);
    border-color: var(--color-error);
    color: #991b1b;
}

.premium-alert-warning {
    background: var(--color-warning-light);
    border-color: var(--color-warning);
    color: #92400e;
}

.premium-alert-info {
    background: var(--color-info-light);
    border-color: var(--color-info);
    color: #1e40af;
}

/* Premium Modal */
.premium-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--spacing-lg);
    animation: fadeIn var(--transition-base);
}

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

.premium-modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.premium-modal-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
}

.premium-modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    border: none;
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    transition: all var(--transition-fast);
}

.premium-modal-close:hover {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
}

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

.premium-modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-200);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* Premium Stats Card */
.premium-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.premium-stat-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
    position: relative;
    overflow: hidden;
}

.premium-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.premium-stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.premium-stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
}

.premium-stat-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.premium-stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    font-weight: var(--font-weight-medium);
}

/* Premium Table */
.premium-table-container {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--color-gray-200);
}

.premium-table {
    width: 100%;
    border-collapse: collapse;
}

.premium-table thead {
    background: var(--color-gray-50);
}

.premium-table th {
    padding: var(--spacing-lg);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--color-gray-200);
}

.premium-table td {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
    color: var(--color-gray-700);
}

.premium-table tbody tr {
    transition: background var(--transition-fast);
}

.premium-table tbody tr:hover {
    background: var(--color-gray-50);
}

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

/* Premium Tooltip */
.premium-tooltip {
    position: relative;
    display: inline-block;
}

.premium-tooltip-text {
    visibility: hidden;
    position: absolute;
    z-index: var(--z-tooltip);
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-gray-900);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.premium-tooltip-text::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--color-gray-900);
}

.premium-tooltip:hover .premium-tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Premium Loading */
.premium-loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.premium-loading-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

/* Premium Section */
.premium-section {
    margin: var(--spacing-2xl) 0;
}

.premium-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.premium-section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
}

.premium-section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    margin-top: var(--spacing-xs);
}

/* Premium Divider */
.premium-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gray-300), transparent);
    margin: var(--spacing-xl) 0;
}

/* ============================================
   5. Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.5rem;
        --font-size-4xl: 1.875rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    .premium-card {
        padding: var(--spacing-lg);
    }

    .premium-stats-grid {
        grid-template-columns: 1fr;
    }

    .premium-modal {
        margin: var(--spacing-md);
    }

    .premium-table-container {
        overflow-x: auto;
    }
}

/* ============================================
   6. Accessibility
   ============================================ */
.premium-btn:focus-visible,
.premium-input:focus-visible,
.premium-select:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.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;
}

/* ============================================
   7. Print Styles
   ============================================ */
@media print {
    .premium-card,
    .premium-modal,
    .premium-stat-card {
        box-shadow: none;
        border: 1px solid var(--color-gray-300);
    }

    .premium-btn {
        border: 1px solid var(--color-gray-300);
    }
}