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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --dark-bg: #0f172a;
    --light-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --success: #10b981;
    --border-color: #334155;
    --danger: #ef4444;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background-color: var(--light-bg);
    padding: 1rem 0;
    border-bottom: 2px solid var(--primary-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    cursor: pointer;
}

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

/* Sections */
section {
    display: none;
    min-height: calc(100vh - 100px);
    padding: 2rem;
}

section.active {
    display: block;
}

.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: 10px;
    margin-bottom: 3rem;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

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

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

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

.btn-cancel:hover {
    background-color: #dc2626;
    transform: translateY(-2px);
}

/* Grid */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.file-card {
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.file-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
    transform: translateY(-5px);
}

.file-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.file-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.file-type {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    width: fit-content;
}

.file-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.file-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.file-author {
    font-weight: 500;
    color: var(--primary-color);
}

.file-downloads {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Browse Section */
.browse-container {
    max-width: 1200px;
    margin: 0 auto;
}

.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filters input,
.filters select {
    padding: 0.75rem;
    background-color: var(--light-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
}

.filters input::placeholder {
    color: var(--text-secondary);
}

.filters input:focus,
.filters select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

/* Upload Section */
.upload-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.form-actions .btn {
    flex: 1;
}

/* Message */
.message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 5px;
    display: none;
}

.message.success {
    display: block;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.message.error {
    display: block;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid #ef4444;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    position: relative;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.close:hover {
    color: var(--accent-color);
}

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

.modal-detail-title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.modal-detail-badge {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    margin-bottom: 1rem;
}

.modal-detail-meta {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.modal-detail-description {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.modal-detail-actions {
    display: flex;
    gap: 1rem;
}

.modal-detail-actions button {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
}

.download-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.download-btn:hover {
    opacity: 0.9;
}

.close-btn {
    background-color: var(--border-color);
    color: var(--text-primary);
}

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

/* Footer */
footer {
    background-color: var(--light-bg);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

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

    .filters {
        flex-direction: column;
    }

    .filters input,
    .filters select {
        width: 100%;
    }

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

    .hero-buttons .btn {
        width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }
}