/**
 * Enhanced 8th Pay Calculator - CSS
 * Designed with Gestalt Principles:
 * - Proximity: Group related elements together
 * - Similarity: Consistent styling for similar elements
 * - Continuation: Visual flow guiding eye movement
 * - Figure/Ground: Clear contrast between content and background
 * - Common Fate: Elements moving together perceived as grouped
 */

/* ========================================
   RESET & BASE STYLES
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --primary: #667eea;
    --primary-dark: #5568d3;
    --success: #10b981;
    --success-dark: #059669;
    --warning: #f59e0b;
    --danger: #ef4444;
    --current-badge: #3b82f6;
    --projected-badge: #8b5cf6;

    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

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

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-900);
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    min-height: 100vh;
    padding: var(--spacing-lg) var(--spacing-md);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   GESTALT PRINCIPLE: FIGURE/GROUND
   Main container stands out from background
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    animation: fadeIn 0.5s ease;
}

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

/* ========================================
   HEADER SECTION
   ======================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--white);
}

.main-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* GESTALT PRINCIPLE: PROXIMITY - Company badges grouped together */
.company-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.company-badges .badge {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--white);
    transition: all var(--transition-base);
}

.company-badges .badge:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.company-badges .badge strong {
    font-weight: var(--font-weight-semibold);
}

.tip {
    font-size: 0.95rem;
    opacity: 0.85;
    font-style: italic;
}

/* ========================================
   GESTALT PRINCIPLE: SIMILARITY & PROXIMITY
   Calculator card with consistent styling
   ======================================== */

.calculator-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    transition: transform var(--transition-slow);
}

.calculator-card:hover {
    transform: translateY(-2px);
}

/* Section Labels */
.section-label {
    display: block;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   DEPARTMENT SELECTION
   GESTALT PRINCIPLE: SIMILARITY - Buttons styled consistently
   ======================================== */

.department-section,
.ratna-section {
    margin-bottom: var(--spacing-xl);
}

.dept-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.dept-btn {
    flex: 1;
    min-width: 150px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-50);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.dept-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

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

.dept-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.dept-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.dept-btn .btn-icon {
    font-size: 2rem;
}

.dept-btn .btn-text {
    font-size: 0.95rem;
}

/* Ratna buttons - smaller variant */
.ratna-btn {
    flex-direction: row;
    min-width: 120px;
    padding: var(--spacing-md);
}

/* Info Badge */
.info-badge {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid var(--primary);
}

/* ========================================
   CALCULATOR INPUTS
   GESTALT PRINCIPLE: PROXIMITY - Related inputs grouped
   ======================================== */

.calculator-inputs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-group.full-width {
    grid-column: 1 / -1;
}

.input-label {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--gray-700);
}

.input-field {
    padding: var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family);
    color: var(--gray-900);
    transition: all var(--transition-base);
    background: var(--white);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

/* Fitment Factor Slider */
.slider {
    width: 100%;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--gray-200);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.slider::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.slider::-moz-range-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.fitment-display {
    font-weight: var(--font-weight-bold);
    color: var(--primary);
    font-size: 1.1rem;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Calculate Button */
.calculate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-md);
}

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

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

.calculate-btn .btn-icon {
    font-size: 1.5rem;
}

/* ========================================
   RESULTS SECTION
   GESTALT PRINCIPLE: CONTINUATION - Visual flow
   ======================================== */

.results-section {
    animation: slideIn 0.5s ease;
}

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

/* Toggle View */
.toggle-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.toggle-label {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--white);
}

.toggle-switch {
    display: flex;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    padding: 4px;
}

.toggle-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--white);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.toggle-btn.active {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* ========================================
   COMPARISON GRID
   GESTALT PRINCIPLE: SIMILARITY - Cards styled consistently
   ======================================== */

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.result-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: all var(--transition-slow);
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
}

.result-card.current .card-header {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.result-card.projected .card-header {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.card-header {
    padding: var(--spacing-lg);
    color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
}

.card-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.current-badge {
    background: rgba(255, 255, 255, 0.25);
}

.projected-badge {
    background: rgba(255, 255, 255, 0.25);
}

/* Card Body - GESTALT PRINCIPLE: PROXIMITY */
.card-body {
    padding: var(--spacing-lg);
}

.salary-component {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--gray-100);
}

.salary-component:last-child {
    border-bottom: none;
}

.component-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: var(--font-weight-medium);
}

.component-value {
    font-size: 1rem;
    color: var(--gray-900);
    font-weight: var(--font-weight-semibold);
}

.component-value.large {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
}

.salary-component.total {
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-sm);
}

.salary-component.total .component-label {
    color: var(--gray-900);
    font-weight: var(--font-weight-bold);
}

.salary-component.total .component-value {
    font-size: 1.25rem;
    color: var(--primary);
}

.salary-component.highlight {
    background: var(--warning);
    margin: 0 calc(-1 * var(--spacing-lg));
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: none;
}

.salary-component.highlight .component-label,
.salary-component.highlight .component-value {
    color: var(--white);
}

.salary-component.negative .component-value {
    color: var(--danger);
}

.divider {
    height: 1px;
    background: var(--gray-200);
    margin: var(--spacing-md) 0;
}

/* Deductions Section */
.card-section.deductions {
    background: var(--gray-50);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) calc(-1 * var(--spacing-lg)) 0;
}

.section-title {
    font-size: 0.875rem;
    font-weight: var(--font-weight-bold);
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

/* Card Footer */
.card-footer {
    background: var(--gray-900);
    color: var(--white);
    padding: var(--spacing-lg);
}

.card-footer .salary-component {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.card-footer .component-label {
    color: var(--gray-300);
}

.card-footer .component-value {
    color: var(--white);
}

.salary-component.takehome {
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid rgba(255, 255, 255, 0.2);
}

.salary-component.takehome .component-value {
    color: var(--success);
}

.salary-component.ctc .component-label {
    font-size: 0.75rem;
}

.salary-component.ctc .component-value {
    font-size: 0.95rem;
}

/* ========================================
   INCREASE SUMMARY
   ======================================== */

.increase-summary {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.increase-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.increase-label {
    font-size: 0.875rem;
    color: var(--white);
    font-weight: var(--font-weight-medium);
}

.increase-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
}

.increase-value.positive {
    color: var(--success);
}

/* ========================================
   INTERACTIVE GRAPH
   ======================================== */

.graph-container {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.section-heading {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

#salary-graph {
    width: 100%;
    min-height: 400px;
}

/* ========================================
   SHARE SECTION
   ======================================== */

.share-section {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.share-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--white);
    color: var(--gray-700);
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
}

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

.share-btn.pdf {
    border-color: var(--danger);
    color: var(--danger);
}

.share-btn.pdf:hover {
    background: var(--danger);
    color: var(--white);
}

.share-btn.whatsapp {
    border-color: #25d366;
    color: #25d366;
}

.share-btn.whatsapp:hover {
    background: #25d366;
    color: var(--white);
}

.share-btn.twitter {
    border-color: #1da1f2;
    color: #1da1f2;
}

.share-btn.twitter:hover {
    background: #1da1f2;
    color: var(--white);
}

.share-btn.copy {
    border-color: var(--gray-400);
    color: var(--gray-700);
}

.share-btn.copy:hover {
    background: var(--gray-700);
    color: var(--white);
}

/* ========================================
   FAQ SECTION
   GESTALT PRINCIPLE: SIMILARITY - Accordion items
   ======================================== */

.faq-section {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.faq-item {
    border-bottom: 1px solid var(--gray-200);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-text {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--gray-900);
    flex: 1;
}

.faq-icon {
    font-size: 0.875rem;
    color: var(--gray-500);
    transition: transform var(--transition-base);
}

.faq-question.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-answer.open {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 0 var(--spacing-lg) 0;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    color: var(--white);
}

.disclaimer {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 0.875rem;
    transition: opacity var(--transition-base);
}

.footer-links a:hover {
    opacity: 0.7;
    text-decoration: underline;
}

.copyright {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ========================================
   RESPONSIVE DESIGN
   Mobile-first approach
   ======================================== */

@media (max-width: 768px) {
    body {
        padding: var(--spacing-md) var(--spacing-sm);
    }

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

    .dept-buttons {
        flex-direction: column;
    }

    .dept-btn {
        min-width: auto;
    }

    .input-row {
        grid-template-columns: 1fr;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .increase-summary {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .share-buttons {
        flex-direction: column;
    }

    .share-btn {
        width: 100%;
        justify-content: center;
    }

    .company-badges {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 1.125rem;
    }

    .description {
        font-size: 0.95rem;
    }

    .calculator-card {
        padding: var(--spacing-md);
    }

    .graph-container,
    .share-section,
    .faq-section {
        padding: var(--spacing-lg);
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    body {
        background: var(--white);
        color: var(--gray-900);
    }

    .header,
    .share-section,
    .calculate-btn,
    .toggle-container {
        display: none;
    }

    .results-section {
        page-break-inside: avoid;
    }

    .result-card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

.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;
}

/* Focus styles for keyboard navigation */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

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