/* OnlineTools - Complete Offline CSS Framework
 * Full Tailwind-like utility classes for complete offline functionality
 * No external dependencies required
 */

/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #374151;
    background-color: #f9fafb;
}

/* Layout Classes */
.min-h-screen { min-height: 100vh; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1 1 0%; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.items-center { align-items: center; }
.space-x-1 > * + * { margin-left: 0.25rem; }
.space-x-2 > * + * { margin-left: 0.5rem; }
.space-x-4 > * + * { margin-left: 1rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }

/* Container System */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

.max-w-6xl { max-width: 72rem; }
.max-w-sm { max-width: 24rem; }
.w-full { width: 100%; }

@media (min-width: 640px) {
    .container { max-width: 640px; }
}

@media (min-width: 768px) {
    .container { max-width: 768px; }
}

@media (min-width: 1024px) {
    .container { max-width: 1024px; }
}

@media (min-width: 1280px) {
    .container { max-width: 1280px; }
}

/* Background Colors */
.bg-gray-100 { background-color: #f3f4f6; }
.bg-gray-200 { background-color: #e5e7eb; }
.bg-gray-300 { background-color: #d1d5db; }
.bg-gray-700 { background-color: #374151; }
.bg-gray-800 { background-color: #1f2937; }
.bg-blue-600 { background-color: #2563eb; }
.bg-blue-700 { background-color: #1d4ed8; }
.bg-white { background-color: #ffffff; }
.bg-red-100 { background-color: #fee2e2; }
.bg-red-500 { background-color: #ef4444; }
.bg-green-100 { background-color: #dcfce7; }
.bg-green-500 { background-color: #22c55e; }
.bg-yellow-100 { background-color: #fef3c7; }
.bg-yellow-500 { background-color: #eab308; }

/* Text Colors */
.text-white { color: #ffffff; }
.text-black { color: #000000; }
.text-gray-300 { color: #d1d5db; }
.text-gray-400 { color: #9ca3af; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1f2937; }
.text-gray-900 { color: #111827; }
.text-blue-200 { color: #dbeafe; }
.text-blue-600 { color: #2563eb; }
.text-red-600 { color: #dc2626; }
.text-green-600 { color: #16a34a; }

/* Typography */
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }

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

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

.leading-tight { line-height: 1.25; }
.leading-normal { line-height: 1.5; }
.leading-relaxed { line-height: 1.625; }

/* Spacing - Padding */
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }

.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }

.pt-2 { padding-top: 0.5rem; }
.pt-4 { padding-top: 1rem; }
.pt-6 { padding-top: 1.5rem; }
.pb-2 { padding-bottom: 0.5rem; }
.pb-4 { padding-bottom: 1rem; }
.pb-6 { padding-bottom: 1.5rem; }

/* Spacing - Margins */
.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 0.75rem; }
.m-4 { margin: 1rem; }
.m-6 { margin: 1.5rem; }
.m-8 { margin: 2rem; }

.mx-auto { margin-left: auto; margin-right: auto; }
.mx-2 { margin-left: 0.5rem; margin-right: 0.5rem; }
.mx-4 { margin-left: 1rem; margin-right: 1rem; }

.my-2 { margin-top: 0.5rem; margin-bottom: 0.5rem; }
.my-4 { margin-top: 1rem; margin-bottom: 1rem; }
.my-8 { margin-top: 2rem; margin-bottom: 2rem; }

.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-auto { margin-top: auto; }

.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }

.ml-2 { margin-left: 0.5rem; }
.ml-4 { margin-left: 1rem; }
.mr-2 { margin-right: 0.5rem; }
.mr-4 { margin-right: 1rem; }

/* Border and Border Radius */
.border { border-width: 1px; }
.border-2 { border-width: 2px; }
.border-t { border-top-width: 1px; }
.border-b { border-bottom-width: 1px; }
.border-l { border-left-width: 1px; }
.border-r { border-right-width: 1px; }

.border-gray-200 { border-color: #e5e7eb; }
.border-gray-300 { border-color: #d1d5db; }
.border-gray-400 { border-color: #9ca3af; }
.border-gray-700 { border-color: #374151; }
.border-blue-500 { border-color: #3b82f6; }

.rounded { border-radius: 0.25rem; }
.rounded-md { border-radius: 0.375rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-full { border-radius: 9999px; }

/* Shadows */
.shadow { 
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06); 
}
.shadow-md { 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); 
}
.shadow-lg { 
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); 
}
.shadow-xl { 
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); 
}

/* Grid System */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

/* Responsive Grid */
@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: #2563eb;
    color: white;
    text-decoration: none;
    border-radius: 0.25rem;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 200ms ease;
    text-align: center;
}

.btn:hover {
    background-color: #1d4ed8;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: #6b7280;
}

.btn-secondary:hover {
    background-color: #4b5563;
}

.btn-success {
    background-color: #22c55e;
}

.btn-success:hover {
    background-color: #16a34a;
}

.btn-danger {
    background-color: #ef4444;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* Forms */
.input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    line-height: 1.25rem;
    background-color: white;
    transition: border-color 150ms ease;
}

.input:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input:disabled {
    background-color: #f3f4f6;
    color: #6b7280;
    cursor: not-allowed;
}

.label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.25rem;
}

.select {
    width: 100%;
    padding: 0.5rem 2.5rem 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    background-color: white;
    background-image: url("data:image/svg+xml;charset=utf-8,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    appearance: none;
}

/* Cards */
.card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    border: 1px solid #e5e7eb;
}

.card-header {
    border-bottom: 1px solid #e5e7eb;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.card-footer {
    border-top: 1px solid #e5e7eb;
    padding-top: 1rem;
    margin-top: 1rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    border-width: 1px;
}

.alert-success {
    background-color: #dcfce7;
    border-color: #bbf7d0;
    color: #166534;
}

.alert-warning {
    background-color: #fef3c7;
    border-color: #fde68a;
    color: #92400e;
}

.alert-error {
    background-color: #fee2e2;
    border-color: #fecaca;
    color: #991b1b;
}

.alert-info {
    background-color: #dbeafe;
    border-color: #bfdbfe;
    color: #1e40af;
}

/* Navigation */
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 0.25rem;
}

nav a {
    color: inherit;
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: 0.25rem;
    transition: all 200ms ease;
    display: block;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}

.table th {
    background-color: #f9fafb;
    font-weight: 600;
    color: #374151;
}

.table tbody tr:hover {
    background-color: #f9fafb;
}

/* Transitions and Animations */
.transition { transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1); }
.transition-colors { transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1); }
.transition-all { transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1); }
.duration-150 { transition-duration: 150ms; }
.duration-200 { transition-duration: 200ms; }
.duration-300 { transition-duration: 300ms; }

/* Hover Effects */
.hover\:bg-blue-700:hover { background-color: #1d4ed8; }
.hover\:bg-gray-50:hover { background-color: #f9fafb; }
.hover\:bg-gray-700:hover { background-color: #374151; }
.hover\:text-blue-200:hover { color: #dbeafe; }
.hover\:text-white:hover { color: #ffffff; }
.hover\:text-blue-600:hover { color: #2563eb; }
.hover\:shadow-md:hover { 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); 
}

/* Focus Effects */
.focus\:outline-none:focus { outline: 2px solid transparent; outline-offset: 2px; }
.focus\:ring:focus { box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); }
.focus\:ring-blue-500:focus { box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3); }
.focus\:border-blue-500:focus { border-color: #3b82f6; }

/* Display */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.hidden { display: none; }
.table-display { display: table; }
.table-cell { display: table-cell; }

/* Position */
.static { position: static; }
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* Visibility */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Z-index */
.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-30 { z-index: 30; }
.z-40 { z-index: 40; }
.z-50 { z-index: 50; }

/* Width & Height */
.w-auto { width: auto; }
.w-full { width: 100%; }
.w-1\/2 { width: 50%; }
.w-1\/3 { width: 33.333333%; }
.w-2\/3 { width: 66.666667%; }
.w-1\/4 { width: 25%; }
.w-3\/4 { width: 75%; }

.h-auto { height: auto; }
.h-full { height: 100%; }
.h-screen { height: 100vh; }

.min-w-0 { min-width: 0px; }
.min-w-full { min-width: 100%; }
.min-h-0 { min-height: 0px; }
.min-h-full { min-height: 100%; }

.max-w-none { max-width: none; }
.max-w-xs { max-width: 20rem; }
.max-w-sm { max-width: 24rem; }
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }
.max-w-xl { max-width: 36rem; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }
.max-w-4xl { max-width: 56rem; }
.max-w-5xl { max-width: 64rem; }

.max-h-full { max-height: 100%; }
.max-h-screen { max-height: 100vh; }

/* Overflow */
.overflow-auto { overflow: auto; }
.overflow-hidden { overflow: hidden; }
.overflow-visible { overflow: visible; }
.overflow-scroll { overflow: scroll; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }

/* Cursor */
.cursor-auto { cursor: auto; }
.cursor-default { cursor: default; }
.cursor-pointer { cursor: pointer; }
.cursor-wait { cursor: wait; }
.cursor-text { cursor: text; }
.cursor-move { cursor: move; }
.cursor-not-allowed { cursor: not-allowed; }

/* List Styles */
.list-none { list-style-type: none; }
.list-disc { list-style-type: disc; }
.list-decimal { list-style-type: decimal; }

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .container {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .mobile-hidden {
        display: none;
    }
}

@media (min-width: 640px) {
    .sm\:block { display: block; }
    .sm\:flex { display: flex; }
    .sm\:hidden { display: none; }
    .sm\:text-sm { font-size: 0.875rem; }
    .sm\:text-base { font-size: 1rem; }
    .sm\:px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
}

@media (min-width: 768px) {
    .md\:block { display: block; }
    .md\:flex { display: flex; }
    .md\:hidden { display: none; }
    .md\:text-lg { font-size: 1.125rem; }
    .md\:px-8 { padding-left: 2rem; padding-right: 2rem; }
    .md\:py-4 { padding-top: 1rem; padding-bottom: 1rem; }
}

@media (min-width: 1024px) {
    .lg\:block { display: block; }
    .lg\:flex { display: flex; }
    .lg\:hidden { display: none; }
    .lg\:text-xl { font-size: 1.25rem; }
    .lg\:px-8 { padding-left: 2rem; padding-right: 2rem; }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .dark\:bg-gray-900 { background-color: #111827; }
    .dark\:bg-gray-800 { background-color: #1f2937; }
    .dark\:text-white { color: #ffffff; }
    .dark\:text-gray-300 { color: #d1d5db; }
    .dark\:border-gray-700 { border-color: #374151; }
}

/* Print Styles */
@media print {
    .print\:hidden {
        display: none !important;
    }
    
    .print\:block {
        display: block !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .shadow, .shadow-md, .shadow-lg, .shadow-xl {
        box-shadow: none !important;
    }
}