@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

/* CSS Variables */
:root {
    --primary-green: #00ff88;
    --primary-orange: #ffffff;
    --primary-red: #ffffff;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --bg-primary: #000000;
    --bg-card: rgba(255, 255, 255, 0.05);
    --border-primary: rgba(255, 255, 255, 0.2);
    --shadow-glow: 0 0 30px rgba(0, 255, 136, 0.3);
}

/* Body and background */
body {
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    color: var(--text-primary);
    font-family: 'Inter', 'Roboto', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

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

.particle {
    position: absolute;
    background: var(--primary-green);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { 
        transform: translateY(0) rotate(0deg); 
    }
    50% { 
        transform: translateY(-20px) rotate(180deg); 
    }
}

/* Container and layout */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 2;
}

/* Header styles */
.header {
    text-align: center;
    margin-bottom: 60px;
    opacity: 0;
    animation: fadeInUp 1s ease-out 0.2s forwards;
    position: relative;
}

.main-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    background: linear-gradient(45deg, var(--primary-green), #ff6b35);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    text-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 20px;
}

/* GitHub link */
.github-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.github-link:hover {
    color: var(--primary-green);
}

.github-icon {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

/* Cards and grid layout */
.certs-container {
    width: 100%;
}

.folders-section {
    width: 100%;
}

.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    width: 100%;
}

.item-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease-out forwards;
    cursor: pointer;
    text-align: center;
    position: relative;
}

.item-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary-green);
}

.item-icon {
    font-size: 3rem;
    color: var(--primary-green);
    margin-bottom: 15px;
    display: block;
}

.item-name {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
    word-wrap: break-word;
}


/* Folder content styles moved to worker.js to avoid conflicts */

.folder-files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.folder-file-item {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: pointer;
    text-align: center;
    position: relative;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.folder-file-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary-green);
}

.folder-file-item .material-icons {
    font-size: 3rem;
    color: var(--primary-green);
    margin-bottom: 15px;
    display: block;
}

.folder-file-item .item-name {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
    word-wrap: break-word;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state .material-icons {
    font-size: 4rem;
    margin-bottom: 20px;
    display: block;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

/* Modal styles */
.certificate-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(10px);
}

.certificate-modal-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: 20px;
    width: 90%;
    max-width: 1200px;
    height: 90%;
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}


/* Modal close button styles */
.modal-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: #000000; 
    border: 1px solid #333333; 
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--primary-green); 
    z-index: 1001;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5); 
}

.modal-close-btn:hover {
    background: var(--primary-red); 
    border-color: var(--primary-red); 
    color: var(--bg-primary); 
}


.modal-close-btn .material-icons {
    font-size: 24px;
     color: inherit;
}


#pdfContainer {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: auto;
}

.pdf-canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border-radius: 10px;
}

.loading {
    color: var(--text-secondary);
    font-size: 1.2rem;
    text-align: center;
}

/* PDF navigation buttons */
.pdf-nav-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: var(--bg-card);
    border-top: 1px solid var(--border-primary);
    flex-wrap: wrap;
}

.pdf-nav-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    min-width: 120px;
    justify-content: center;
}

.pdf-nav-btn:hover {
    background: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--bg-primary);
}

.pdf-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pdf-nav-btn:disabled:hover {
    background: var(--bg-card);
    border-color: var(--border-primary);
    color: var(--text-primary);
}

.pdf-nav-btn .material-icons {
    font-size: 18px;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll indicator */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-green), var(--primary-orange));
    transform-origin: left;
    transform: scaleX(0);
    z-index: 1000;
    transition: transform 0.3s ease;
}

/* 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: 0;
}

/* Focus styles for accessibility */
.item-card:focus,
.folder-file-item:focus,
.pdf-nav-btn:focus,
.modal-close-btn:focus {
    outline: 2px solid var(--primary-green);
    outline-offset: 2px;
}

/* Language selection */
.language-selection {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.lang-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-primary);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--bg-primary);
}

.lang-btn.active {
    background: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--bg-primary);
}

/* Form elements */
.form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form-input {
    padding: 12px;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    width: 100%;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 2px rgba(0, 255, 136, 0.2);
}

.submit-btn {
    padding: 12px 24px;
    background: var(--primary-green);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    background: var(--primary-orange);
    color: var(--bg-primary);
    transform: translateY(-2px);
}

/* Profile elements */
.profile-image {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.profile-img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-green);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

/* Mobile responsive design */
@media (max-width: 1024px) {
    .container {
        padding: 30px 15px;
    }
    
    .items-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }
    
    .item-card {
        padding: 25px;
    }
    
    .certificate-modal-content {
        width: 95%;
        height: 95%;
    }
    
    .pdf-nav-buttons {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .pdf-nav-btn {
        min-width: 100px;
        padding: 10px 15px;
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 10px;
    }
    
    .main-title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .items-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .item-card {
        padding: 20px;
    }
    
    .folder-files-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 10px;
    }
    
    .certificate-modal-content {
        border-radius: 10px;
    }
    
    .pdf-nav-buttons {
        padding: 15px;
        gap: 8px;
    }
    
    .pdf-nav-btn {
        flex: 1;
        min-width: auto;
        padding: 8px 12px;
        font-size: 0.75rem;
    }
    
    .language-selection {
        position: relative;
        top: auto;
        right: auto;
        justify-content: center;
        margin-bottom: 20px;
    }
}

@media (max-width: 480px) {
    .header {
        margin-bottom: 30px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .item-card {
        padding: 15px;
    }
    
    .item-icon {
        font-size: 2.5rem;
    }
    
    .item-name {
        font-size: 1rem;
    }
    
    .modal-close-btn {
        width: 40px;
        height: 40px;
        top: 15px;
        right: 15px;
    }
    
    .modal-close-btn .material-icons {
        font-size: 20px;
    }
    
    #pdfContainer {
        padding: 10px;
    }
}