/* ============================================
   ConvertJPGtoPDF.in - Unified Design System
   Single CSS file for optimal performance
   ============================================ */

/* === CSS VARIABLES === */
:root {
    /* Primary Colors - Dark Blue Theme */
    --primary: #0e397e;
    --primary-dark: #051433;
    --primary-light: #1e5bb8;

    /* Accent Colors */
    --accent: #f59e0b;
    --accent-dark: #d97706;

    /* Neutral Colors */
    --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;

    /* Semantic Colors */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    /* Typography */
    --font-primary: 'Lexend', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Jost', 'Lexend', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* 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);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.875rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1.125rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-800);
    /* Improved contrast for accessibility */
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
    text-decoration-thickness: 2px;
    /* Better visibility */
    text-underline-offset: 3px;
    /* Better visibility */
}

a:hover {
    color: var(--primary-dark);
}

/* === LAYOUT === */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-narrow {
    max-width: 900px;
}

.section {
    padding: var(--spacing-2xl) 0;
}

/* === HEADER === */
.header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--font-heading);
}

.logo a {
    display: block;
    line-height: 0;
    text-decoration: none;
}

.logo img {
    height: 50px;
    width: auto;
    aspect-ratio: 15 / 5;
    display: block;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav a {
    color: var(--gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav a:hover {
    color: var(--primary);
}

/* === HERO SECTION === */
.hero {
    background: radial-gradient(circle, #0e397e 0%, #051433 60%, #020b1e 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.hero h1 {
    color: white;
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.98);
    /* Improved contrast for accessibility */
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.trust-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.15);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.98);
    will-change: transform;
    /* Improved contrast for accessibility */
}

.trust-badge svg {
    width: 20px;
    height: 20px;
}

/* === UPLOAD ZONE === */
.upload-container {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    margin-top: calc(var(--spacing-2xl) * -1);
    position: relative;
    z-index: 10;
    min-height: 400px;
    contain: layout paint;
    display: flex;
    flex-direction: column;
}

.upload-zone {
    border: 3px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    cursor: pointer;
    background: var(--gray-50);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary);
}

.upload-zone h3 {
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.upload-zone p {
    color: var(--gray-700);
    /* Improved contrast for accessibility */
    font-size: 0.95rem;
}

.file-input {
    display: none;
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base), color var(--transition-base);
    text-decoration: none;
    font-family: var(--font-primary);
}

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

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

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

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

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* === IMAGE PREVIEW GRID === */
.preview-container {
    display: none;
    max-width: 100%;
    overflow-x: hidden;
    min-height: 200px;
    /* Reserve space to prevent layout shift */
}

.preview-container.active {
    display: block;
    order: -1;
    margin-bottom: var(--spacing-xl);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-sm);
    max-width: 100%;
    overflow-x: hidden;
    max-height: 50vh;
    overflow-y: auto;
    padding-right: 4px;
    /* Space for scrollbar */
    padding-bottom: 4px;
}

/* Custom Scrollbar for preview grid */
.preview-grid::-webkit-scrollbar {
    width: 6px;
}

.preview-grid::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 4px;
}

.preview-grid::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 4px;
}

.preview-grid::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

.preview-item {
    position: relative;
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: move;
    transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base), opacity var(--transition-base);
    max-width: 100%;
    overflow: hidden;
    box-sizing: border-box;
}


.preview-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.preview-item.dragging {
    opacity: 0.5;
}

.preview-image {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
    max-width: 100%;
    aspect-ratio: 1;
    /* Prevent layout shift */
}

.preview-filename {
    font-size: 0.85rem;
    color: var(--gray-800);
    /* Improved contrast for accessibility */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--spacing-xs);
}

.preview-actions {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: center;
}

.icon-btn {
    background: var(--gray-100);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--gray-200);
}

.icon-btn.delete:hover {
    background: var(--error);
    color: white;
}

.icon-btn svg {
    width: 16px;
    height: 16px;
}

/* === CONTROLS === */
.controls {
    background: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.control-group {
    margin-bottom: var(--spacing-md);
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-group label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
}

.radio-group {
    display: flex;
    gap: var(--spacing-md);
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.radio-option input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* === LOADER === */
.loader-container {
    display: none;
    text-align: center;
    padding: var(--spacing-xl);
    min-height: 200px;
    /* Reserve space to prevent layout shift */
}

.loader-container.active {
    display: block;
    order: -1;
    margin-bottom: var(--spacing-xl);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-md);
    flex-shrink: 0;
    /* Prevent layout shift */
}

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

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transition: width var(--transition-base);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }

    100% {
        background-position: 200px 0;
    }
}

/* === FOOTER === */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    align-items: start;
}

/* Logo Section */
.footer-brand {
    max-width: 320px;
}

.footer-logo {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    display: inline-block;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.footer-logo img {
    height: 60px;
    width: auto;
    display: block;
}

.footer-tagline {
    color: var(--gray-400);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* Links Section */
.footer-links-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    color: white;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--gray-400);
    /* Improved contrast for accessibility */
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    display: inline-block;
    padding: 0.25rem 0;
    text-decoration-thickness: 2px;
    /* Enhanced visibility for accessibility */
    text-underline-offset: 3px;
    /* Enhanced visibility for accessibility */
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: var(--spacing-lg);
    text-align: center;
    font-size: 0.9rem;
    color: var(--gray-500);
}

/* === MOBILE MENU TOGGLE === */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0.5rem;
    color: var(--gray-800);
    /* Darker for better contrast */
    transition: background-color var(--transition-fast), color var(--transition-fast);
    z-index: 1001;
}

.mobile-menu-toggle svg {
    width: 28px;
    height: 28px;
    color: var(--gray-700);
}

/* Upload zone text - show/hide based on device */
.upload-mobile {
    display: none;
}

.upload-desktop {
    display: block;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

/* === RESPONSIVE - MOBILE FIRST === */
@media (max-width: 768px) {

    /* Base Typography - Smaller for mobile */
    body {
        font-size: 14px;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    /* Container - Smaller padding */
    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Header - Mobile optimized */
    .header {
        padding: 0.5rem 0;
    }

    .logo img {
        height: 40px;
    }

    /* Mobile Menu Toggle */
    .mobile-menu-toggle {
        display: block;
    }

    /* Off-canvas Navigation */
    .nav {
        position: fixed;
        top: 0;
        right: -280px;
        width: 280px;
        height: 100vh;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 5rem 1.5rem 2rem;
        gap: 0;
        z-index: 999;
        transition: right 0.3s ease;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
    }

    .nav.active {
        right: 0;
    }

    .nav a {
        width: 100%;
        padding: 1rem 0;
        border-bottom: 1px solid var(--gray-200);
        font-size: 1.1rem;
    }

    .nav a:last-child {
        border-bottom: none;
    }

    /* Hero Section - Mobile optimized */
    .hero {
        padding: var(--spacing-lg) 0;
    }

    .hero h1 {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-sm);
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: var(--spacing-md);
    }

    /* Trust Badges - 2x2 Grid on mobile */
    .trust-badges {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }

    .trust-badge {
        padding: 0.75rem;
        font-size: 0.85rem;
    }

    .trust-badge svg {
        width: 20px;
        height: 20px;
    }

    /* Upload Zone - Mobile optimized */
    .upload-zone {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .upload-desktop {
        display: none;
    }

    .upload-mobile {
        display: block;
    }

    .upload-zone h3 {
        font-size: 1.1rem;
    }

    .upload-zone p {
        font-size: 0.875rem;
    }

    .upload-icon {
        width: 48px;
        height: 48px;
    }

    /* Preview Grid - 2 columns on mobile */
    .preview-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .preview-item {
        aspect-ratio: 1;
    }

    .preview-item img {
        height: 100%;
        object-fit: cover;
    }

    /* Controls - Stack on mobile */
    .controls {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .control-group {
        width: 100%;
    }

    .radio-group {
        flex-wrap: wrap;
    }

    /* Buttons - Full width on mobile */
    .btn {
        width: 100%;
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }

    /* Section padding */
    .section {
        padding: var(--spacing-xl) 0;
    }

    /* How it works - Stack on mobile */
    .steps {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    /* Features grid */
    .features-grid {
        grid-template-columns: 1fr;
    }

    /* Footer - Stack on mobile */
    /* Footer - Mobile */
    .footer {
        padding: var(--spacing-xl) 0 var(--spacing-md);
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }

    .footer-brand {
        max-width: 100%;
    }

    .footer-logo {
        margin: 0 auto var(--spacing-md);
    }

    .footer-logo img {
        height: 50px;
    }

    .footer-links-group {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }

    .footer-column h4 {
        font-size: 0.875rem;
        margin-bottom: var(--spacing-sm);
    }

    .footer-column a {
        font-size: 0.875rem;
    }

    .footer-bottom {
        padding-top: var(--spacing-md);
        font-size: 0.85rem;
    }
}

/* Extra small devices */
@media (max-width: 480px) {
    .preview-image {
        height: 80px;
    }

    .preview-filename {
        font-size: 0.8rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .trust-badges {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .trust-badge {
        padding: 0.5rem;
        font-size: 0.8rem;
    }

    .preview-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
    }

    .preview-item {
        padding: var(--spacing-xs);
    }
}

/* === UTILITY CLASSES === */
.text-center {
    text-align: center;
}

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

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

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.hidden {
    display: none;
}

.visible {
    display: block;
}