/* Main Content */
.hero {
    text-align: center;
    padding: 20px 10px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 5px;
    color: var(--dark);
}

.hero p {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto 10px;
}

/* Conversion Box */
.converter-box {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.upload-area {
    border: 2px dashed #ddd;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 25px;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: var(--primary);
    background-color: rgba(0, 85, 185, 0.03);
}

.upload-area i {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 15px;
}

.upload-area h3 {
    margin-bottom: 10px;
    color: var(--dark);
}

.upload-area p {
    color: var(--gray);
    font-size: 0.9rem;
}

.format-options {
    display: flex;
    justify-content: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.format-option {
    margin: 0 10px;
}

.format-option input {
    display: none;
}

.format-option label {
    padding: 8px 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.format-option input:checked + label {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.convert-btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-bottom: 20px;
}

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

.progress-container {
    width: 100%;
    background-color: #f1f1f1;
    border-radius: 5px;
    margin-bottom: 20px;
    display: none;
}

.progress-bar {
    height: 10px;
    border-radius: 5px;
    background-color: var(--primary);
    width: 0%;
    transition: width 0.3s;
}

.download-btn {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    display: none;
}

.download-btn:hover {
    background-color: #218838;
}

.success-message {
    color: #28a745;
    margin-top: 10px;
    display: none;
    font-size: 0.9rem;
}

.error-message {
    color: #dc3545;
    margin-top: 10px;
    display: none;
    font-size: 0.9rem;
}

/* Features Section - 3 columns */
.features {
    padding: 50px 20px;
    background-color: white;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {            
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background-color: #f8f9fa;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 40px;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    font-size: 0.95rem;
}

/* About Section */
.about {
    padding: 100px 0;
    background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.about-content h2 {
    font-size: 30px;
    margin-bottom: 10px;
    color: var(--dark);
}

.about-content p {
    font-size: 18px;
    margin-bottom: 20px;
    color: #555;
    line-height: 1.8;
}

.about ul {
    font-size: 18px;
    margin-bottom: 25px;
    padding-left: 20px;
}

.about ul li {
    margin-bottom: 10px;
    color: #555;
}

/* FAQ Section */
.faq {
    padding: 30px 20px;
    background-color: #f8f9fa;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 10px;
    font-size: 18px;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
}

.faq-question {
    padding: 10px 20px;
    background-color: white;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
}

.faq-question:hover {
    background-color: #f1f1f1;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s, padding 0.3s;
    background-color: white;
}

.faq-item.active .faq-answer {
    padding: 20px;
    max-height: 500px;
}

/* Ads Section */
.ad-space {
    background: #f0f7ff;
    border: 1px dashed var(--primary);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
    margin: 2px 0;
    color: var(--gray);
}
   
/* Responsive Design */
@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 40px 15px 30px;
    }
    
    .hero h1 {
        font-size: 1.6rem;
    }
    
    .format-options {
        flex-direction: column;
        align-items: center;
    }
    
    .format-option {
        margin: 5px 0;
        width: 100%;
    }
    
    .format-option label {
        display: block;
        width: 100%;
        padding: 8px;
    }
    
    .feature-card {
        padding: 20px 15px;
    }
}

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

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 10px;
    vertical-align: middle;
}