/* CSS Variables - iLovePDF Style Color Scheme */
:root {
    --primary-red: #E53E3E;
    --secondary-blue: #4299E1;
    --success-green: #38A169;
    --warning-orange: #D69E2E;
    --neutral-gray: #718096;
    --light-gray: #F7FAFC;
    --dark-gray: #2D3748;
    --white: #FFFFFF;
    --black: #000000;
    
    /* Tool Card Colors */
    --jpg-gradient: linear-gradient(135deg, #FF6B6B, #FF8E8E);
    --png-gradient: linear-gradient(135deg, #4ECDC4, #72D0C7);
    --webp-gradient: linear-gradient(135deg, #45B7D1, #6BC5D6);
    --avif-gradient: linear-gradient(135deg, #96CEB4, #A8D5BA);
    --gif-gradient: linear-gradient(135deg, #FFEAA7, #FFED4A);
    --bmp-gradient: linear-gradient(135deg, #DDA0DD, #E6B3E6);
    --tiff-gradient: linear-gradient(135deg, #FFB347, #FFC266);
    --svg-gradient: linear-gradient(135deg, #98D8C8, #ABE0D1);
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 4rem 0;
    --card-border-radius: 12px;
    --btn-border-radius: 8px;
    
    /* Shadows */
    --header-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    background-color: var(--white);
    box-shadow: var(--header-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #E2E8F0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    min-height: 70px;
}

/* Logo */
.logo a {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-img {
    height: 50px;
    width: auto;
    object-fit: contain;
    display: block;
    max-width: 180px;
    transition: var(--transition-fast);
}

.logo-img:hover {
    transform: scale(1.02);
}

/* Logo text styles removed - using logo-only design */

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--dark-gray);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--btn-border-radius);
    transition: var(--transition-fast);
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    background-color: var(--light-gray);
    color: var(--primary-red);
}

/* Dropdown */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    border: 1px solid #E2E8F0;
    border-radius: var(--card-border-radius);
    box-shadow: var(--card-shadow);
    padding: 1rem;
    min-width: 400px;
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    z-index: 1001;
}

.nav-item:hover .dropdown-menu {
    display: grid;
}

.dropdown-section h4 {
    color: var(--dark-gray);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.dropdown-link {
    display: block;
    color: var(--neutral-gray);
    text-decoration: none;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.dropdown-link:hover {
    color: var(--primary-red);
}

.dropdown-arrow {
    transition: var(--transition-fast);
}

.dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

/* Main Content */
.main {
    min-height: calc(100vh - 70px);
}

/* Hero Section */
.hero {
    padding: var(--section-padding);
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
}

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 800;
    color: var(--dark-gray);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--neutral-gray);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Tools Grid */
.tools-grid {
    margin-top: 3rem;
}

.tools-section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark-gray);
    margin-bottom: 2rem;
    text-align: left;
    border-bottom: 3px solid var(--primary-red);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.tool-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Tool Card */
.tool-card {
    background: var(--white);
    border: 1px solid #E2E8F0;
    border-radius: var(--card-border-radius);
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--jpg-gradient);
    transition: var(--transition-smooth);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.tool-card:hover::before {
    height: 6px;
}

/* Tool Card Variants */
.jpg-card::before {
    background: var(--jpg-gradient);
}

.png-card::before {
    background: var(--png-gradient);
}

.webp-card::before {
    background: var(--webp-gradient);
}

.avif-card::before {
    background: var(--avif-gradient);
}

.gif-card::before {
    background: var(--gif-gradient);
}

.bmp-card::before {
    background: var(--bmp-gradient);
}

.tiff-card::before {
    background: var(--tiff-gradient);
}

.svg-card::before {
    background: var(--svg-gradient);
}

.tool-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.tool-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 0.75rem;
}

.tool-desc {
    color: var(--neutral-gray);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Show More Button */
.show-more {
    text-align: center;
    margin-top: 2rem;
}

.show-more-btn {
    background: transparent;
    border: 2px solid var(--primary-red);
    color: var(--primary-red);
    padding: 0.75rem 2rem;
    border-radius: var(--btn-border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.show-more-btn:hover {
    background: var(--primary-red);
    color: var(--white);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--btn-border-radius);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: var(--transition-fast);
}

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

.btn-primary:hover {
    background: #C53030;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-red);
    color: var(--primary-red);
}

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

/* Features Section */
.features {
    margin-top: 4rem;
    padding-top: 4rem;
    border-top: 1px solid #E2E8F0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature {
    text-align: center;
    padding: 2rem 1rem;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 1rem;
}

.feature-desc {
    color: var(--neutral-gray);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-desc {
    color: #A0AEC0;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-link {
    color: #A0AEC0;
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-red);
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    font-size: 1.5rem;
    text-decoration: none;
    transition: var(--transition-fast);
}

.social-link:hover {
    transform: scale(1.2);
}

/* Footer Bottom */
.footer-bottom {
    border-top: 1px solid #4A5568;
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.copyright {
    color: #A0AEC0;
    font-size: 0.9rem;
}

.footer-badges {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.badge {
    background: rgba(229, 62, 62, 0.1);
    color: var(--primary-red);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 0;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .nav-link {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    
    /* Mobile Logo Styles */
    .logo-img {
        height: 40px;
        max-width: 140px;
    }
    
    .dropdown-menu {
        position: fixed;
        top: auto;
        left: 1rem;
        right: 1rem;
        min-width: auto;
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }
    
    .tool-cards {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tool-card {
        padding: 1.5rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        text-align: center;
        flex-direction: column;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .tool-card {
        padding: 1.25rem;
    }
    
    .tool-name {
        font-size: 1.1rem;
    }
    
    .tool-desc {
        font-size: 0.9rem;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-red);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

/* Focus States */
.nav-link:focus,
.tool-card:focus,
.btn:focus,
.footer-link:focus {
    outline: 2px solid var(--primary-red);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .features {
        display: none;
    }
    
    .hero {
        padding: 1rem 0;
    }
    
    .tool-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}