/* ========================================
   Base64 Converter - Calculator Specific Styles
   ======================================== */

/* Tab Navigation Pills */
.nav-pills .nav-link {
    border-radius: 12px;
    padding: 8px 12px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    color: #667eea;
    background: rgba(255, 255, 255, 0.6);
    margin-right: 5px;
}

.nav-pills .nav-link:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.nav-pills .nav-link.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.nav-pills .nav-link i {
    margin-right: 5px;
}

/* Input Labels */
.input-label {
    font-weight: 600;
    color: #667eea;
    margin-bottom: 8px;
    display: block;
    font-size: 0.95rem;
}

.input-label i {
    margin-right: 5px;
}

/* Output Textarea */
.output-textarea {
    background: rgba(102, 126, 234, 0.05) !important;
    cursor: default;
}

/* Upload Zone */
.upload-zone {
    border: 3px dashed #667eea;
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    background: rgba(102, 126, 234, 0.05);
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-zone * {
    pointer-events: none;
}

.upload-zone:hover {
    border-color: #764ba2;
    background: rgba(118, 75, 162, 0.1);
    transform: scale(1.02);
}

.upload-zone.dragover {
    border-color: #48bb78;
    background: rgba(72, 187, 120, 0.1);
    transform: scale(1.05);
}

.upload-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 15px;
}

.upload-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 5px;
}

.upload-hint {
    font-size: 0.85rem;
    color: #9ca3af;
    margin: 0;
}

/* Image Preview */
.image-preview {
    max-width: 100%;
    max-height: 300px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-top: 15px;
}

/* Statistics */
.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-label {
    font-weight: 600;
    color: #4b5563;
    font-size: 0.95rem;
}

.stat-value {
    font-family: 'Roboto Mono', monospace;
    font-weight: 700;
    font-size: 1rem;
    color: #667eea;
}

/* Template & Copy Buttons */
.template-btn,
.copy-btn {
    font-size: 0.9rem;
    padding: 10px;
    transition: all 0.3s ease;
}

.template-btn:hover,
.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
}

.template-btn i,
.copy-btn i {
    margin-right: 5px;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .nav-pills .nav-link {
        font-size: 0.8rem;
        padding: 6px 8px;
        margin-right: 3px;
        margin-bottom: 5px;
    }

    .nav-pills .nav-link i {
        display: none;
    }

    .upload-zone {
        padding: 30px 15px;
    }

    .upload-icon {
        font-size: 2rem;
    }

    .upload-text {
        font-size: 0.95rem;
    }

    .stat-label,
    .stat-value {
        font-size: 0.85rem;
    }

    .template-btn,
    .copy-btn {
        font-size: 0.85rem;
        padding: 8px;
    }
}

@media (max-width: 576px) {
    .nav-pills {
        display: flex;
        flex-wrap: wrap;
    }

    .nav-pills .nav-link {
        flex: 1 1 45%;
        text-align: center;
        margin-right: 2px;
    }

    .image-preview {
        max-height: 200px;
    }
}