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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-primary: #f3f3f3;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

body {
    font-family: 'Vazirmatn', 'Vazir', 'Tahoma', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #667eea 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    min-height: 100vh;
    direction: rtl;
    color: var(--text-primary);
    font-weight: 400;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Background Animation */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    animation: float 20s infinite linear;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 15%;
    animation-delay: -7s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 80%;
    left: 70%;
    animation-delay: -14s;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); opacity: 0.7; }
    33% { transform: translateY(-30px) rotate(120deg); opacity: 0.4; }
    66% { transform: translateY(30px) rotate(240deg); opacity: 0.7; }
    100% { transform: translateY(0px) rotate(360deg); opacity: 0.7; }
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
    padding: 30px 0;
}

.header-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    opacity: 0.9;
    animation: pulse 2s infinite;
}

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

.header h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    letter-spacing: -0.02em;
    animation: slideInDown 1s ease-out;
}

.header-subtitle p {
    font-size: clamp(1rem, 3vw, 1.3rem);
    opacity: 0.9;
    font-weight: 300;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    animation: slideInUp 1s ease-out 0.3s both;
}

@keyframes slideInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Calculator Container */
.calculator-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.3);
    animation: slideInUp 1s ease-out 0.6s both;
    position: relative;
    overflow: hidden;
}

.calculator-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

/* Calculation Type Selector */
.calculation-type-selector {
    margin-bottom: 40px;
}

.selector-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
}

.selector-header i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.selector-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
}

.radio-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg-secondary);
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    font-weight: 400;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.radio-label::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.radio-label:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.radio-label:hover::before {
    opacity: 0.05;
}

.radio-label input[type="radio"] {
    display: none;
}

.radio-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    margin-left: 15px;
    position: relative;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-color);
    background: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
    content: '';
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.radio-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.radio-content i {
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.radio-label input[type="radio"]:checked ~ .radio-content i {
    color: var(--primary-color);
}

.radio-label input[type="radio"]:checked ~ .radio-content span {
    color: var(--primary-color);
    font-weight: 500;
}

/* Input Section */
.input-section {
    margin-bottom: 40px;
}

.input-group {
    margin-bottom: 28px;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
}

.input-group label i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.input-wrapper,
.select-wrapper {
    position: relative;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 18px 50px 18px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    font-weight: 400;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.input-group input::placeholder {
    color: var(--text-secondary);
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    font-weight: 300;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.input-icon,
.select-icon {
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.1rem;
    pointer-events: none;
    transition: color 0.3s ease;
}

.input-group input:focus + .input-icon,
.input-group select:focus + .select-icon {
    color: var(--primary-color);
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    box-shadow: var(--shadow-lg);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.calculate-btn:active {
    transform: translateY(-1px);
}

.btn-ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Results Section */
.results-section {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    padding: 35px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    animation: slideInUp 0.6s ease-out;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
}

.results-header i {
    color: var(--success-color);
    font-size: 1.5rem;
}

.results-header h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    font-weight: 600;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
}

.results-grid {
    display: grid;
    gap: 20px;
}

.result-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.result-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.result-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.result-info {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-label {
    font-weight: 500;
    color: var(--text-secondary);
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    font-size: 1rem;
}

.result-value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.3rem;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: white;
    opacity: 0.9;
    font-size: 0.95rem;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    font-weight: 300;
}

.footer-content i {
    font-size: 1rem;
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .calculator-container {
        padding: 25px;
        border-radius: var(--radius-lg);
    }
    
    .radio-group {
        grid-template-columns: 1fr;
    }
    
    .radio-label {
        padding: 16px;
        font-size: 0.9rem;
    }
    
    .input-group input,
    .input-group select {
        padding: 16px 45px 16px 18px;
        font-size: 0.95rem;
    }
    
    .calculate-btn {
        padding: 18px;
        font-size: 1.1rem;
    }
    
    .results-section {
        padding: 25px;
    }
    
    .result-item {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .result-info {
        flex-direction: column;
        gap: 8px;
    }
    
    .result-value {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 20px;
        margin: 10px;
    }
    
    .radio-label {
        padding: 14px;
        font-size: 0.85rem;
    }
    
    .radio-content {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .input-group input,
    .input-group select {
        padding: 14px 40px 14px 16px;
    }
    
    .calculate-btn {
        padding: 16px;
        font-size: 1rem;
    }
    
    .results-section {
        padding: 20px;
    }
    
    .result-icon {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
}

/* Loading Animation */
.calculate-btn.loading {
    background: linear-gradient(135deg, #a0aec0 0%, #cbd5e0 100%);
    cursor: not-allowed;
    transform: none;
}

.calculate-btn.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .calculator-container {
        background: rgba(30, 30, 30, 0.95);
        color: #f1f5f9;
    }
    
    .input-group input,
    .input-group select {
        background: #374151;
        color: #f1f5f9;
        border-color: #4b5563;
    }
    
    .results-section {
        background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
    }
    .result-item {
        background: #1f2937;
        color: #f1f5f9;
    }
    
    .result-label {
        color: #d1d5db;
    }
    
    .radio-label {
        background: #374151;
        border-color: #4b5563;
        color: #f1f5f9;
    }
    
    .radio-label:hover {
        background: #4b5563;
    }
}

/* Persian Number Styling */
.persian-number {
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
    font-feature-settings: "ss01" on;
    font-variant-numeric: tabular-nums;
}

/* Enhanced Focus Indicators */
.input-group input:focus,
.input-group select:focus,
.radio-label:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Smooth Transitions */
.input-group input:focus::placeholder {
    opacity: 0.7;
    transform: translateX(5px);
    transition: all 0.3s ease;
}

/* Button Hover Effects */
.calculate-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.calculate-btn:hover::before {
    left: 100%;
}

/* Micro-interactions */
.input-wrapper:hover .input-icon,
.select-wrapper:hover .select-icon {
    transform: translateY(-50%) scale(1.1);
    color: var(--primary-color);
}

/* Results Animation */
.result-item {
    opacity: 0;
    transform: translateY(20px);
    animation: resultSlideIn 0.5s ease-out forwards;
}

.result-item:nth-child(1) { animation-delay: 0.1s; }
.result-item:nth-child(2) { animation-delay: 0.2s; }
.result-item:nth-child(3) { animation-delay: 0.3s; }

@keyframes resultSlideIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .bg-animation,
    .floating-shape,
    .calculate-btn {
        display: none;
    }
    
    .calculator-container {
        background: white;
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .results-section {
        background: #f5f5f5;
        border: 1px solid #000;
    }
}

/* Error States */
.input-group.error input,
.input-group.error select {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: 'Vazirmatn', 'Vazir', sans-serif;
}

.error-message i {
    font-size: 0.9rem;
}

/* Success States */
.input-group.success input,
.input-group.success select {
    border-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Loading Skeleton */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* Advanced Grid Layout for larger screens */
@media (min-width: 1200px) {
    .radio-group {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .results-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .result-item {
        flex-direction: column;
        text-align: center;
        padding: 25px;
    }
    
    .result-info {
        flex-direction: column;
        gap: 10px;
    }
}

/* Ultra-wide screen support */
@media (min-width: 1600px) {
    .container {
        max-width: 1200px;
    }
    
    .calculator-container {
        padding: 50px;
    }
    
    .radio-group {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* Landscape mobile optimization */
@media (max-height: 500px) and (orientation: landscape) {
    .header {
        padding: 15px 0;
        margin-bottom: 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .header-subtitle p {
        font-size: 1rem;
    }
    
    .calculator-container {
        padding: 25px;
    }
    
    .radio-group {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .radio-label {
        padding: 12px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .header-icon,
    .result-icon i,
    .radio-content i {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .floating-shape,
    .bg-animation,
    .btn-ripple {
        animation: none;
    }
    
    .calculate-btn:hover,
    .radio-label:hover,
    .result-item:hover {
        transform: none;
    }
}

/* Focus visible for better accessibility */
.calculate-btn:focus-visible,
.radio-label:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Custom selection colors */
::selection {
    background: rgba(99, 102, 241, 0.2);
    color: var(--text-primary);
}

::-moz-selection {
    background: rgba(99, 102, 241, 0.2);
    color: var(--text-primary);
}

/* Enhanced mobile touch targets */
@media (max-width: 768px) {
    .radio-label,
    .calculate-btn,
    .input-group input,
    .input-group select {
        min-height: 48px; /* Minimum touch target size */
    }
    
    .radio-custom {
        width: 28px;
        height: 28px;
    }
    
    .radio-custom::after {
        width: 12px;
        height: 12px;
    }
}

/* Container queries support (future-proofing) */
@supports (container-type: inline-size) {
    .calculator-container {
        container-type: inline-size;
    }
    
    @container (max-width: 600px) {
        .radio-group {
            grid-template-columns: 1fr;
        }
    }
}

/* Backdrop filter fallback */
@supports not (backdrop-filter: blur(20px)) {
    .calculator-container {
        background: rgba(255, 255, 255, 0.98);
    }
}

/* Enhanced Persian typography */
body {
    font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
    text-rendering: optimizeLegibility;
}

/* Improved number formatting */
.result-value {
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.5px;
}

/* Animation performance optimization */
.floating-shape,
.bg-animation {
    will-change: transform;
    transform: translateZ(0);
}

/* Final responsive adjustments */
@media (max-width: 320px) {
    .container {
        padding: 10px;
    }
    
    .calculator-container {
        padding: 15px;
        margin: 5px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .radio-label {
        padding: 12px;
        font-size: 0.8rem;
    }
    
    .input-group input,
    .input-group select {
        padding: 12px 35px 12px 14px;
        font-size: 0.9rem;
    }
    
    .calculate-btn {
        padding: 14px;
        font-size: 0.95rem;
    }
}