/**
 * Design System - Professional CMS Admin Panel
 * Inspired by TailAdmin - Modern, Clean, Professional
 * Version: 3.0.0
 */

:root {
    /* ========== Colors - TailAdmin Professional Palette ========== */
    /* Primary Colors - Sky Blue (Professional) */
    --color-primary-50: #f0f9ff;
    --color-primary-100: #e0f2fe;
    --color-primary-200: #bae6fd;
    --color-primary-300: #7dd3fc;
    --color-primary-400: #38bdf8;
    --color-primary-500: #0ea5e9;
    --color-primary-600: #0284c7;
    --color-primary-700: #0369a1;
    --color-primary-800: #075985;
    --color-primary-900: #0c4a6e;
    
    /* Secondary Colors - Blue */
    --color-secondary-50: #eff6ff;
    --color-secondary-100: #dbeafe;
    --color-secondary-200: #bfdbfe;
    --color-secondary-300: #93c5fd;
    --color-secondary-400: #60a5fa;
    --color-secondary-500: #3b82f6;
    --color-secondary-600: #2563eb;
    --color-secondary-700: #1d4ed8;
    --color-secondary-800: #1e40af;
    --color-secondary-900: #1e3a8a;
    
    /* Accent Colors */
    --color-accent-purple: #38bdf8;
    --color-accent-blue: #3b82f6;
    --color-accent-green: #10b981;
    --color-accent-red: #ef4444;
    --color-accent-yellow: #f59e0b;
    --color-accent-orange: #f97316;
    
    /* Neutral Colors - Professional Gray Scale */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    
    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-50: #ecfdf5;
    --color-success-100: #d1fae5;
    --color-success-600: #059669;
    --color-success-700: #047857;
    
    --color-error: #ef4444;
    --color-error-50: #fef2f2;
    --color-error-100: #fee2e2;
    --color-error-600: #dc2626;
    --color-error-700: #b91c1c;
    
    /* Error color alias for compatibility */
    --error-color: var(--color-error);
    
    --color-warning: #f59e0b;
    --color-warning-50: #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-600: #d97706;
    --color-warning-700: #b45309;
    
    --color-info: #3b82f6;
    --color-info-50: #eff6ff;
    --color-info-100: #dbeafe;
    --color-info-600: #2563eb;
    --color-info-700: #1d4ed8;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-gradient: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 100%);
    --bg-gradient-light: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;
    --text-muted: #94a3b8;
    
    /* Border Colors */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;
    --color-border: var(--border-light);
    
    /* Card & Container */
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --card-hover-bg: #f8fafc;
    --main-bg: #f8fafc;
    
    /* Input & Form */
    --input-bg: #ffffff;
    --input-border: #e2e8f0;
    --input-text: #1e293b;
    --input-placeholder: #94a3b8;
    
    /* Table */
    --table-header-bg: #f8fafc;
    --table-row-hover-bg: #f8fafc;
    
    /* Link Colors */
    --link-color: #2563eb;
    
    /* ========== Typography ========== */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", 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-size-5xl: 3rem;      /* 48px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* ========== Spacing ========== */
    --spacing-0: 0;
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    --spacing-20: 5rem;     /* 80px */
    --spacing-24: 6rem;     /* 96px */
    
    /* ========== 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;
    
    /* ========== Shadows - Professional & Subtle ========== */
    --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-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Professional Card Shadow */
    --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* ========== 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;
}

/* ========== Base Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    /* Prevent flash of light mode */
    background: var(--main-bg, #f8fafc);
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background: var(--bg-secondary, var(--main-bg, #f8fafc));
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Prevent flash of light mode */
    transition: background-color 0.1s ease, color 0.1s ease;
}

/* ========== Typography Utilities ========== */
.text-xs { font-size: var(--font-size-xs); line-height: 1.5; }
.text-sm { font-size: var(--font-size-sm); line-height: 1.5; }
.text-base { font-size: var(--font-size-base); line-height: 1.5; }
.text-lg { font-size: var(--font-size-lg); line-height: 1.5; }
.text-xl { font-size: var(--font-size-xl); line-height: 1.5; }
.text-2xl { font-size: var(--font-size-2xl); line-height: 1.3; }
.text-3xl { font-size: var(--font-size-3xl); line-height: 1.3; }
.text-4xl { font-size: var(--font-size-4xl); line-height: 1.2; }
.text-5xl { font-size: var(--font-size-5xl); line-height: 1.1; }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }
.font-extrabold { font-weight: var(--font-weight-extrabold); }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-muted { color: var(--text-muted); }
.text-inverse { color: var(--text-inverse); }

/* ========== Layout Utilities ========== */
.container {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0 var(--spacing-6);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-6);
}

.section {
    padding: var(--spacing-8) 0;
}

.section-sm {
    padding: var(--spacing-6) 0;
}

.section-lg {
    padding: var(--spacing-12) 0;
}

/* ========== Card Component - Professional Style ========== */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-6);
    border: 1px solid var(--border-light);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--bg-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary-200);
    transform: none !important;
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    padding-bottom: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--border-light);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
    letter-spacing: -0.025em;
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.card-body {
    padding: var(--spacing-4) 0;
}

.card-footer {
    padding-top: var(--spacing-4);
    margin-top: var(--spacing-4);
    border-top: 1px solid var(--border-light);
}

/* ========== Button Component - Professional Style ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    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: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

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

.btn-primary {
    background: var(--bg-gradient);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-secondary-600);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-secondary-700);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: var(--color-success);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
    background: var(--color-success-600);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: var(--color-error);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-error-600);
    box-shadow: var(--shadow-lg);
}

.btn-warning {
    background: var(--color-warning);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-warning:hover:not(:disabled) {
    background: var(--color-warning-600);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary-600);
    color: var(--color-primary-600);
    box-shadow: none;
}

.btn-outline:hover:not(:disabled) {
    background: var(--color-primary-600);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

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

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

/* ========== Form Components - Professional Style ========== */
.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
    letter-spacing: -0.01em;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    font-family: var(--font-family-base);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1.5px solid var(--border-medium);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
    background: var(--bg-tertiary);
    cursor: not-allowed;
    opacity: 0.6;
}

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

.form-help {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-top: var(--spacing-2);
    font-weight: var(--font-weight-normal);
}

.form-error {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--spacing-2);
    font-weight: var(--font-weight-medium);
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary-600);
}

.form-checkbox-label {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
}

/* ========== Alert Component - Professional Style ========== */
.alert {
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-lg);
    border-left: 4px solid;
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
}

.alert-success {
    background: var(--color-success-50);
    border-color: var(--color-success);
    color: var(--color-success-700);
}

.alert-error {
    background: var(--color-error-50);
    border-color: var(--color-error);
    color: var(--color-error-700);
}

.alert-warning {
    background: var(--color-warning-50);
    border-color: var(--color-warning);
    color: var(--color-warning-700);
}

.alert-info {
    background: var(--color-info-50);
    border-color: var(--color-info);
    color: var(--color-info-700);
}

/* ========== Badge Component - Professional Style ========== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    line-height: 1;
    letter-spacing: 0.025em;
}

.badge-primary {
    background: var(--color-primary-100);
    color: var(--color-primary-800);
}

.badge-success {
    background: var(--color-success-100);
    color: var(--color-success-700);
}

.badge-error {
    background: var(--color-error-100);
    color: var(--color-error-700);
}

.badge-warning {
    background: var(--color-warning-100);
    color: var(--color-warning-700);
}

.badge-info {
    background: var(--color-info-100);
    color: var(--color-info-700);
}

/* ========== Table Component - Professional Style ========== */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
}

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table thead {
    background: var(--bg-tertiary);
}

.table th {
    padding: var(--spacing-4) var(--spacing-5);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-light);
    letter-spacing: -0.01em;
}

.table td {
    padding: var(--spacing-4) var(--spacing-5);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
}

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

.table tbody tr:hover {
    background: var(--bg-secondary);
}

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

/* ========== Grid System ========== */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.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); }

@media (max-width: 1024px) {
    .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .grid-cols-4,
    .grid-cols-3,
    .grid-cols-2 { grid-template-columns: repeat(1, 1fr); }
}

/* ========== Utility Classes ========== */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-5 { gap: var(--spacing-5); }
.gap-6 { gap: var(--spacing-6); }

.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-5 { margin-top: var(--spacing-5); }
.mt-6 { margin-top: var(--spacing-6); }
.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-5 { margin-bottom: var(--spacing-5); }
.mb-6 { margin-bottom: var(--spacing-6); }

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

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* ========== Page Header ========== */
.page-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-8) var(--spacing-8);
    margin: 0;
    width: 100%;
    max-width: 100%;
}

.page-header .container {
    max-width: 100% !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
}

.page-content {
    padding: var(--spacing-6) var(--spacing-8);
    width: 100%;
    max-width: 100%;
    margin: 0;
}

/* ========== Responsive Utilities ========== */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .section {
        padding: var(--spacing-6) 0;
    }
    
    .card {
        padding: var(--spacing-5);
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .card {
        padding: var(--spacing-4);
        border-radius: var(--radius-lg);
    }
    
    .btn {
        padding: var(--spacing-2) var(--spacing-4);
        font-size: var(--font-size-sm);
    }
    
    .page-header {
        padding: var(--spacing-6) 0;
    }
}

/* ========== Loading Spinner ========== */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

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

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* ========== Print Styles ========== */
@media print {
    .card {
        box-shadow: none;
        border: 1px solid var(--border-light);
    }
    
    .btn {
        display: none;
    }
}